Four-wire configurations are commonly used in residential microgrids, where single-phase and nonlinear loads introduce harmonics, third-harmonic currents, and negative-sequence components. These harmonics often circulate within delta loops formed by line conductors, while negative-sequence currents cause power imbalance. In wind energy-based microgrids with transformers, such harmonic and unbalanced currents are often reflected into transformer or grid, leading to overheating, increased losses, reduced active power transfer ability, and possible failure. Processing these harmonic currents through transformers to prevent grid contamination demands a higher-rated neutral conductor, adding cost and thermal stress. To address these challenges, this work proposes a three-phase four-wire topology with an auxiliary converter at load point of common coupling (PCC), supported by a solar photovoltaic (SPV) array and battery energy storage (BES). Four-leg auxiliary converter compensates for load harmonics, neutral currents, negative-sequence components, and reactive power, while enabling power exchange from SPV array and BES units. It operates in both grid-forming and grid-following modes to support seamless transitions between islanded and grid-connected states. Integrated multi-mode control ensures coordinated source operation and compliance with IEEE Std. 1547 during mode transitions. Simulation results validate system effectiveness across various modes, demonstrating substantial improvements in power quality and operational reliability in residential microgrids.

Wireless power transfer (WPT) is a reliable method for powering implantable medical devices. However, achieving high efficiency with a compact receiver (RX) remains a major challenge. Self-resonant wireless power transfer (SRWPT) systems enhance reliability by using parasitic capacitance within planar coils, eliminating external compensation components. This paper presents a fully self-resonant three-coil PCB system that eliminates external capacitors while improving power transfer efficiency for compact RX coils. The system utilizes three specially designed double-layer coil structures: two dedicated to generating high inductance values (L₂ and L₃), and one configured as an auxiliary coil to further enhance impedance. This arrangement achieves inductances up to four times greater than those of a traditional coil with the same footprint. Through a series combination of mutual inductance (Lm) and mutual capacitance (Cm) within the auxiliary coil network, the resonant frequency and system impedance are significantly increased, leading to improved overall efficiency and system robustness. Moreover, the size mismatch between the transmitter (TX) and receiver (RX) coils necessitates precise synchronization of their resonant frequencies. To achieve this, an air-core structure is employed instead of FR4, allowing flexible frequency tuning through coil spacing adjustments while simultaneously reducing power losses. Simulation results demonstrate that the proposed system achieves a power transfer efficiency of 94.6% at a transmission distance of 10 mm.

Community and residential loads connected to low voltage AC distribution networks require a neutral point connection. Neutral point forms return path for single-phase loads. Presence of neutral wire reduces effect of unbalanced loading of one phase to get reflected on other load phases. It helps during fault conditions to minimize effect of circulating current by providing low impedance path. However, in case of harmonically polluted load currents, rating of neutral conductor increases, leading to additional losses and unwanted heating effecting other components of network. Wind energy conversion systems (WECS) use transformer for connection to AC network to reduce requirement of higher rating and size of DC link capacitor. Neutral current and harmonic currents of load are processed through the transformer, which leads to additional heating of transformer ands which is detrimental for connected loads. Such conditions can lead to failure of WECS operation and damage transformer and connected sensitive loads due to flow of circulating currents. Hence, this work presents design and control of a novel four wire topology of a WECS comprising of a doubly fed induction generator (DFIG) and a battery energy storage (BES). A grid forming converter (GFC) is deployed to provide independent compensation for load neutral and harmonic currents without affecting the WECS transformer, reducing its failure and heating rate. WECS converters are controlled to improve power quality of stator current and point of common coupling (PCC) voltage as per the IEEE 519-2022 std. Simulation results present MPPT operation of WECS with neutral and harmonic compensation even during dynamic conditions.

The nonlinear loads demean the system power quality leading to increased ohmic losses and shorter equipment lifespan. To mitigate power quality challenges, this work proposes a multiple delayed signal cancellation filter with 15 layers and unit delay factor (MDSC115) for improved power quality of a grid-tied solar power conversion system (SPCS) equipped with a battery energy storage (BES). The control attenuates all integral positive sequence harmonic components from 2ndto 30thharmonics excluding positive sequence 16thharmonic. It also eliminates integral negative sequence harmonic components from 1stto 28thharmonics excluding negative sequence 14th harmonic, including 0 Hz DC component, without the need of additional prefilters cascaded to the filter. A modified frequency locked loop (MFLL) is incorporated to make the MDSC115 adaptive to the varying grid frequency and make it immune to phase angle jump and frequency fluctuations in the grid voltages. The MDSC115-MFLL improves the power quality of SPCS during grid adversities and load current irregularities. Performance of MDSC115-MFLL is validated in MATLAB during several dynamic test cases and compared with other delay-based controls to ensure better performance and commitment to the IEEE std. 519 during operation of SPCS.

In this paper, a performance study of a decentralized control strategy for a hybrid standalone power generation system (HSPGS) is presented. The HSPGS consists of a wind turbine driven variable speed permanent magnetic synchronous DC generator (PMBLDCG), solar photovoltaic system (SPS), battery storage system (BSS), diesel engine driven fixed speed synchronous generator (SG), loads, and secondary loads. To achieve high performance from all energy sources of the SHPGS, two boost converters, buck-boost converter, and three-phase inverters are controlled using increment conductance (IC) algorithm and two-level control strategy, respectively. To manage the power in the system a new control algorithm based on state flow is developed and implemented. The performance of HSPGS and its developed control strategies as well as the power management algorithm, are tested using MATLAB/Simulink under and weather conditions change.

In this work, the uninterrupted residential power supply is ensured by utilizing a resilient synchronization control for distributed generation based reconfigurable AC microgrid. The distributed generation from renewables such as photovoltaic array and wind power generation with energy storage is included. The power supply reliability is enhanced by utilizing a diesel generator (DG) as a back-up source for the instances of generation shortage from renewable resources and completely drained battery storage. The seamless operating modes namely current control and voltage control are enabled in accordance to the occurrence/clearance of the faults via the static transfer switches (STS-1/2) that isolate/reconnect the microgrid to the utility/DG. The high quality power is ensured by utilizing ε-normalized sign regressor least mean square (ε-NSRLMS) algorithm to evaluate the total current active component of loads. Modified notch filter based second order generalized integrator-frequency locked loop (MNF-SOGI-FLL) avoids frequency and phase oscillations and provides the effective frequency and phase synchronization. The output of the DG is controlled by the automatic voltage regulator (AVR) associated at the synchronous generator (SG) field terminals. The microgrid allows sensitive load operation, uninterrupted residential load supply and improved power quality and these are confirmed from simulation and experimental results obtained from the laboratory prototype.

In this paper, the bacterial foraging optimization (BFO) method is developed to track the Global Maximum Power Point (GMPP) of a partially shaded PV system for a standalone PV system. This heuristic method emulates the behavior of E.coli bacteria and can be used to solve various complex problems. Voltage and current measured data are used as input to evaluate the operation point of the PV system and the BFO method can reach the GMPP within an appropriate time. Simulation results confirm the performance of the BFO method for GMMPT for different partial shading profiles of a PV system.

This paper deals with the power quality improvement in a solar photovoltaic (PV) array generation-based EV (Electrical Vehicle) charging station. This charging station is capable of operating in standalone mode and charging the EV battery with the power generated by a PV array. Moreover, it also interfaces with the utility and feeds it the remaining power. Another advantage of the charging station is the compensation of the reactive power for the improvement of the grid power quality. The charging station serves the following purposes (i) harmonics current compensation, (ii) EV battery charging/discharging control, (iii) simultaneous EV battery charging and harmonics current compensation and (iv) simultaneous discharging and harmonics current compensation. The charging station is controlled in such a manner that it operates satisfactorily even under the unbalance grid voltages and total harmonics distortion of the grid currents is reduced below 5% as suggested in the IEEE-519 standard. The control strategy is designed in such a manner that the charging station operates in grid connected mode. However, if the charging station loses the synchronism, then it operates in standalone mode and PV array charges the EV battery. A synchronization control is also developed to connect the system to the grid, when it is available.

In this paper, a microgrid based on solar photovoltaic (PV) array and a battery energy storage (BES) is presented, which operates in an islanded mode and the grid connected mode. It changes the mode of operation seamlessly, while supplying uninterrupted power to the load. A cascaded SOGI (Second-Order-Generalized-Integrator) based control is used in GCM. The cascaded SOGI is used to extract the fundamental component of the nonlinear load current. A PV array power feed-forward component is used for improving its system dynamics. An optimal power from the solar PV array is acquired by using an I&C (Incremental Conductance) technique. In IM, a voltage control scheme is utilized, which controls the frequency and voltage at point of common coupling (PCC). The efficacy of cascaded SOGI based technique is demonstrated through test results at various conditions such as vaying load, changing solar irradiance and transition between the modes of operation.

Battery-based electric spring has a great potential of providing various ancillary services in distribution systems. However, by far, a half-bridge inverter has been mostly employed as a single-phase electric spring. Thus, in this work, a seven-level electric spring with superior efficiency and power quality performance using modified seven-level pack U-cell inverter suitable for both low and medium voltage applications has been introduced. The operation principles, topology, comparison with the conventional electric spring configuration, and sensorless seven-level pulse width modulation method of the introduced seven-level electric spring has been presented. Furthermore, an RCD based control method has been utilized for the seven-level smart load setup for the first time. Finally, extensive simulation results have verified operating characteristics and performance of the proposed multilevel electric-spring-based smart load for both stabilizing the point of common coupling voltage and improving the power factor of the noncritical load during various steady-state/transient conditions.

This paper presents a single-phase neutral point clamped (NPC) multilevel converter (MLC) configuration for grid-connected photovoltaic (PV) applications. A single-stage control is implemented to feed PV array power to the grid at unity power factor. The direct and quadrature components-based controller is designed to have independent control on active and reactive powers injection. A low computational DC component injection based neutral point voltage (NPV) balance regulator ensures equal charging and discharging of DC-link capacitors. Moreover, the pulse width modulation technique with unipolar pattern is applied at lower switching frequency to adhere with minimum switching losses and power quality standards. The system performance in terms of parameters such as NPV balancing, converter voltage harmonics, the grid current harmonics, and unity power factor operation is analysed at variable irradiances. Simulation results are obtained using MATLAB/Simulink are validated using OPALRT test bench.

This paper aims at investigating the ac dynamic parameters of partially shaded solar PV cells. We employ analytical and numerical methods to extract the parameters of ac dynamic model of a PV cell. Particularly, the parameter identification process is based on the small signal impedance model of solar cells and its associated transfer function. This model can reflect the static and the dynamic performances of the solar cell at low and high frequencies. The analytical method utilizes mathematical equations derived from Nyquist and Bode plots, whereas the numerical method exploits Levenberg-Marquardt Least Squares (LMLS) algorithm. In this paper, we have also designed an adapted experimental laboratory circuit to measure the PV cells frequency response. The entire procedure, including the acquisition and calculation systems is completely automated using C# programming. Accordingly, we developed a low-cost setup that allows partial shading emulation as well as high power and frequency measurements. Our results demonstrate that the numerical method can achieve a better fit of data with an accuracy of 91%. Moreover, it can estimate the same parameter values in a short time with high precision.

This paper proposes a dual output Luo converter fed SRM (Switched Reluctance Motor) drive. The proposed converter generates two symmetrical output voltages. In order to obtain PFC (power factor correction) operation drive is operated in DCM (discontinuous conduction mode). The current through two output inductor is discontinuous in each switching period. The converter provides high efficiency, high power density and simple structure. The regulated output voltages of proposed converter are fed to SR motor. The SR motor here is selected for the drive due to its low cost and easy construction. The variable speed operation of proposed drive is obtained by varying DC link voltage. The proposed converter configuration has controlled DC link voltage with power quality improvement at supply. Simulation results shows the PFC operation with reduced input current THD below 5%, as per the given IEEE standard.

A three phase to five phase configured twenty pulse AC-DC converter fed 3-level modular multilevel inverter (MMLI) based vector controlled induction motor drive (VCIMD) is presented in this work. To limit the total harmonic distortion (THD) in the utility current as per IEEE-519 standard, a twenty pulse AC-DC converter is used at the input end of the proposed drive. A three phase system is converted into two sets of five phase AC voltages to achieve twenty pulses in each cycle of the supply current. At the drive end, a 3-level MMLI is used to improve the steady state, dynamic and power quality performance of the drive. An indirect vector control with sinusoidal pulse width modulation (SPWM) is used to control an induction motor and 3-level MMLI, respectively. A twenty pulse AC-DC converter fed 3-level inverter based VCIMD is modelled and its performance is simulated in Simulink/MATLAB environment to demonstrate its effectiveness for medium power application.

Anew control strategy to achieve high performance from solar photovoltaic system using single stage inverter interfacing grid without maximum power point tracking (MPPT) techniques is investigated in this paper. Sinusoid-tracking algorithm and adaptive filter is proposed to improve the power quality and to regulate constant AC voltage at the point of common coupling (PCC). Proportional integral controllers for the both outer loops are reinforced by antiwindup strategy to prevent saturation issue when system is subjected to sudden variation. The effectiveness of the developed control algorithm and the proposed configuration are tested using Matlab/Simulink.

In this paper, a multifunctional three-phase grid-connected single-stage solar photovoltaic (SPV) system is presented using an intelligent adaptive control technique. The system configures a SPV array, VSC (Voltage Source Converter), interfacing inductors, ripple filter and three-phase grid connected nonlinear loads. The system is multifunctional as it provides functions of two different modes: 1) It acts as a SPV energy conversion system supplying active power to the loads and grid as well as a DSTATCOM (Distributed Static Compensator), and 2) It acts as a DSTATCOM alone, when SPV generation is unavailable and mitigates several power quality issues such as harmonics attenuation, voltage fluctuations and flickers, reactive power compensation, power factor correction (PFC) and load balancing. It uses a single-stage converter topology with variable step-size least mean fourth (VSS-LMF) derived adaptive control technique for VSC switching incorporating perturb and observe (P&O) method for MPPT (Maximum Power Point Tracking). The performance of the presented system is validated through experimental results obtained on the developed laboratory prototype.

This paper presents a switched reluctance motor (SRM) drive with power factor correction. Here SRM drive up to 1 kW rating fed with midpoint converter is considered. As per the requirement buck boost converter is modified to obtain two equal DC output voltages to feed mid-point converter. The speed control of proposed drive is obtained by regulated DC link voltage. Here a closed loop control based on voltage mode control is designed to obtain the reference DC link voltage. The high frequency inductors of buck boost converter are design to operate in discontinuous conduction mode, to reduce system size. The supply current THD (Total Harmonic Distortion) due to peaky nature of current in conventional configuration is brought down below 5% as per IEC 6100-3-2 standard.

In this paper control design for safe and effective operation of small-scale hybrid wind/diesel/Battery standalone power generation system (WT-DG HSPGS) employing fixed speed generators is investigated. To compensate the fluctuation of wind power, reduce the run-time of the diesel generator (DG), regulate the AC voltage and the system frequency, as well as, to improve the power quality at the PCC, STATCOM supported by battery energy storage system (BESS) is controlled employing synchronous reference frame (SRF) theory and estimated in-phase and quadrature unit AC voltage templates. To synchronize the DG to the PCC, breaker switch is controlled using the estimated voltage phase angle and the system frequency. To protect BESS from overcharging, dump loads is controlled using simple approach based on BESS limit charging voltage. To test the performance of the proposed WT-DG HSPGS and their developed control algorithms under presence of balanced/unbalanced, linear/nonlinear loads and change in climate conditions, simulations are carried out using MATLAB/Simulink.

This paper deals with investigations of three-different active control schemes employed for MW size solar-photovoltaic (PV) power plants integrated with radial distribution feeder. A very well-known matured topology using a booster and three-leg voltage source converter is used for solar-PV power generation to design three control schemes named as volt-watt control, volt-var control and dynamic reactive power control. The performance of designed control schemes are observed in terms of bus voltages, active and reactive power injection under similar solar irradiance profile. The proposed control schemes with solar-PV plants are modeled using MATLAB and Open-DSS software's.

This paper presents three phase single stage single source SPV (Solar Photovoltaic) grid tied system using asymmetric cascaded 27-level converter operating at fundamental switching frequency using pulse width modulation (PWM) scheme. An application of the asymmetric cascaded 27-level converter in comparison to symmetric cascaded 27-level converter have advantages viz. higher voltage levels, less distortion, low switching losses, simplicity of operation at high power that leads to the improvement of power quality of the system proposed herein. A simple decoupled current controller with incremental conductance maximum power point tracking method is used to control the proposed system. The simulated results in MATLAB validate the system under varying conditions such as solar insolations level.

This paper deals with a two stage solar photovoltaic (SPV) fed speed sensorless vector controlled induction motor drive (IMD) for water pumping system which is superior to conventional controlled motor as it is cheaper and reliable. One common practice is to estimate the flux from the terminal voltages and currents. The performance of the drive depends on the accuracy of the flux estimator. Usually the efficiency of the induction motor drive (IMD) is high around the rated load and deteriorates at partial loading. However, the efficiency can be enhanced by operating the motor at optimum flux by controlling the flux component of current. In this paper, a minimization technique is proposed to minimize the total losses to operate the drive at maximum efficiency. A modified perturb and observe (P&O) algorithm is used to track maximum power from SPV array. The smooth starting of the motor is attained by vector control of an induction motor. The system performance is simulated in MATLAB/Simulink environment and the results are compared with the conventional vector controlled IMD.

In this paper, a new algorithm is presented for maximum power point tracking (MPPT) of solar PV array. This method first forecasts the maximum power point (MPP) by using tangents to the power-voltage curve at two end points of an interval and then iteratively converges to the MPP by evaluating whether the true MPP lies on the left or right side of the estimated MPP. The proposed algorithm has the advantage that MPPT is achieved within an almost fixed and small number of iterations irrespective of the power level. The working of the control approach is first demonstrated through MATLAB/Simulink simulation and simulated results are then verified experimentally by the hardware implementation of a standalone photo-voltaic (PV) system.

This paper deals with control of hybrid standalone power generation using micro-hydro power turbine (MHP) coupled with a squirrel cage induction generator (SCIG) and a solar photovoltaic panel (PV), which is connected to the common DC bus of three-phase voltage source converter (VSC). The AC terminals of VSC are connected to point of common coupling (PCC) through interface inductors. A battery energy storage system (BESS) is also tied with the common DC bus through a buck-boost converter. The proposed system is mostly suitable to serve the power needs of any small size residential green building situated near a small river or cannel. Control algorithms are proposed for the three-phase VSC and the DC-DC buck-boost converter in order to extract the maximum power from PV array with single-stage conversion, to regulate the AC voltage and frequency at PCC and to improve the power quality. The effectiveness and the robustness of proposed controllers are validated by simulation using Matlab/Simulink at linear and nonlinear loads under different climate conditions.

This paper deals with control of three-level neutral point clamped (NPC) voltage source converters (VSCs) for medium rating doubly fed induction generator (DFIG) based off-grid wind energy conversion system. A three-level three-leg insulated gate bipolar transistors (IGBTs) based NPC-VSC is used as a rotor converter (RC). Four-leg three-level IGBTs based NPC-VSC is used as a load converter (LC). A battery energy storage system (BESS) is employed at the DC bus of back to back connected LC and RC in the rotor circuit. The BESS facilitates establishment of off-grid supply using RC control and absorb or supply deficit load power under wind speed variations. A vector-oriented control scheme for RC and LC establishes functions of a load leveler, a load balancer, a harmonic eliminator, a zero sequence load current compensator, a maximum power tracker and a capacitor voltage balancer under dynamic conditions either due to consumer loads or wind. The proposed control scheme for a DFIG based off-grid system is developed and its performance is found satisfactory under steady state and dynamic conditions.

This paper analyses the position error compensation in quadrature analog magnetic encoders through the iterative linear search optimization algorithm of "steepest descent". In current literature, the sine/cosine signals from the encoder are compensated considering only the gain mismatch, the DC offset components and the non-orthogonality. Nevertheless, the magnetic field distortion due to the non-homogeneity of the magnet and the distortion of the signals due to the mechanical misalignment between the rotation axis of the motor shaft, the magnet center and the chip sensor are generally neglected. In this work, all of these factors are taken into account. The results show that a higher order approximation for modeling the harmonic distortion contained in the encoder signals leads to a slight biasing in the convergence of the compensating parameters. However, the unconstrained and multivariate optimization algorithm of steepest descent fairly minimizes the error from the objective function F(xn) allowing achieve a compensation efficiency of up to 66%, thus increasing the overall accuracy of this kind of magnetic encoders and improving the performance of any application where they provide rotary position feedback.

This paper presents a new topology of hybrid AC-DC standalone system based on solar photo-voltaic (PV) array and wind turbine (WT) feeding three-phase four-wire loads. The proposed hybrid system employs two back to back converters and dc-dc boost converter to achieve maximum power point tracking (MPPT). To balance the power at the PCC, the system is reinforced by BESS (Battery Energy Storage System) to keep constant frequency and voltage and to improve the power quality. The dump load is added to the system and is placed at the common dc bus to manage the extra power when the battery is fully charged. The capacitor bank is used to provide the reactive power to the doubly fed induction generator (DFIG). The proposed system is studied for various types of linear, nonlinear and dynamic loads and under varying climate conditions. The dynamic behavior of the proposed system is verified using MATLAB/Simulink.

Economy of Central African countries is growing very fast and the energy demand is increasing daily. As a result, the insufficient of electrical power generation is one of the major problems that slow the development. This paper is mostly focused on a technical and economical feasibility study of building integrated photovoltaic system (BIPVS) supposed to be compatible with the local consumption habit. To achieve this goal, a model of building with 263 kWh daily consumption is studied. A high efficiency dc-ac converter is modeled and controlled to interface the integrated photovoltaic system with the grid and building. A sliding mode algorithm is used to control a dc-dc converter for extracting the maximum available power from photovoltaic system. For emergencies, a battery pack is designed to supply sensitive equipment and lighting. The studied system is validated using the professional PV*SOL software and "Matlab/ Simpower system". The results are promising and could be an efficient solution to the mentioned problems.

This paper deals on control strategy and analyzing power flow between home integrated photovoltaic system (PVS), plug-in hybrid electric vehicle (PHEV) and distribution network The neutral point clamp (NPC) multilevel inverter is the main element that allows interfacing between the different energy sources and receptors. The combination of synchronous reference frames (SRF) and indirect control algorithms applied to NPC, has allowed the system working in On and Off-grid condition for providing a continuous and uninterruptible power supply, for minimizing losses and managing effectively the power flow. The integrated PVS is supposed to satisfy a power load demand in the normal condition of solar irradiation. A PHEV is charging from PVS or grid and could supply power in case of off-grid emergency situation. An onboard bidirectional charger is modeled and controlled by sliding mode algorithm in order to ensure a secure charging and discharging of PHEV batteries. The system is tested for power factor correction and voltage regulation along with harmonic elimination. The performance of the system is validated using MATLAB software with its Simulink and power system blockset toolboxes.

In this paper, different Distribution Static Compensators (DSTATCOMs) topologies, state of the art, their performance, design considerations, future developments, and potential applications are investigated for power quality improvement. These DSTATCOMs for three-phase three-wire systems and three-phase four-wire systems are developed and installed in the distribution system for many functions, such as reactive power compensation, harmonics elimination, load balancing, and neutral current compensation. This paper is aimed to explore a broad perspective on DSTATCOMs to researchers, engineers, and the community dealing with the power quality improvement. A classified list of some latest research publications is also provided for quick reference.

This paper presents a new design and control for HWDBS (Hybrid Wind-Diesel-Battery System) feeding three-phase four-wire local loads. The proposed system consists of two energy sources connected to the dc bus; a WT (Wind Turbine) and a DE (Diesel Engine) based on variable speed generators. The system utilizes two back-to-back connected converters and uncontrolled three-phase converter connected in cascade with dc-dc SEPIC converter. The system uses BESS (Battery Energy Storage System) placed at the dc bus to manage the exchange of power between the energy sources and the loads. The VSC (Voltage Source Converter) of WT side is controlled in order to achieve maximum power tracking by varying the rotor speed of the SCIG (Squirrel Cage Induction Generator). In order to improve the control performance and to reduce the cost of SCIG, the MRAS (Model Reference Adaptive System) speed observer based on stator voltage and currents is adopted. The DE is controlled in order to balance the power of the system by changing its speed according to the load power demand and to minimise the fuel consumption. DE is switch off when the WT power is greater than the load power demand. The main objective of the interfacing load side VSC is to achieve a constant voltage and frequency and to compensate unbalance using symmetrical components of the load currents. The proposed system is studied for various types of linear, nonlinear and dynamic loads and under varying wind speed conditions. The dynamic behavior of the proposed system is verified using MATLAB/SIMULINK.

In various practical applications such as harmonic current elimination, reactive power compensation and power factor correction many adaptive filtering techniques are used for control of DSTATCOM (Distribution Static Compensator). This paper presents a comparative study of the performance of two weight updating adaptive algorithm LMS (Least Mean Square) based ADALINE (Adaptive Linear Neural Network) and Fuzzy logic based variable step size LMS used for harmonic current detection using VSC (Voltage Source Converter) based DSTATCOM (Distribution Static Compensator). Simulation results in MATLAB environment show that the convergence speed of fuzzy logic based variable step size LMS is much faster and its performance is better than LMS based Adaline under varying load conditions in DSTATCOM application for power quality improvement.

This paper deals with the design and modeling of a small scale stand-alone wind energy conversion system (WECS) using a maximum power point tracking (MPPT) controller and permanent magnet brushless dc (PMBLDC) generator. The WECS consists of a wind turbine, PMBLDC generator, MPPT controller, isolated half bridge dc-dc converter, battery, voltage source inverter (VSI) and output filter. The fuzzy logic based MPPT controller is designed for a stand-alone WECS for regulating the duty cycle of the dc-dc converter to extract maximum power. The power quality at the consumer load end is maintained using an output voltage controller, which regulates the output voltage and current of VSI. The designed system is modeled and its behavior is simulated in Matlab/Simulink using simpower system and fuzzy logic toolboxes.

This paper presents an implementation of shunt custom power device namely distribution static compensator (DSTATCOM) using a neural network based Anti Hebbian control algorithm for power quality improvement under linear/nonlinear type consumer loads. Learning based Anti-Hebbian control algorithm is used for extraction of fundamental active and reactive power components of load currents in terms of weighted signals which are used for deriving the reference source currents. This control algorithm is implemented on a developed DSTATCOM using a DSP for reactive power compensation, harmonic elimination and load balancing. Simulation and test results demonstrate satisfactory performance of proposed control algorithm for the control of DSTATCOM under time varying loads.

In this paper, we present an efficient voltage and frequency controller for a stand-alone photovoltaic (PV) system with a battery storage element. A maximum power point technique (MPPT) is used to extract the maximum power available in the PV array despite the weather conditions variations. The array output voltage is converted to an AC voltage using a PWM voltage source inverter where its output voltage and frequency are regulated using a closed loop control which is feed to a stand-alone load. Moreover, the battery storage elements are used to compensate for any variation in climatic conditions or load profile. The results show the effectiveness of the proposed MPP technique and the developed voltage/frequency controller.

This paper presents the integration of high frequency signal injection (HFSI) and extended electromotive force (EMF) based techniques for sensorless control of permanent magnet synchronous machines (PMSM) intended for propulsion in hybrid/electric vehicles (HEV/EV). Taking advantage of the strengths of each method and thanks to the saliency properties of the machine the operation in the whole speed range is possible. The both sensorless techniques are combined by means of a weighting function to avoid bumps during speed transitions. The performance of the proposed sensorless control strategy in all speed regions and under speed reversal conditions is evaluated through simulations developed in MATLAB®-SimPowerSystems™. The results show that by using the proposed strategy the torque-speed curve for a 50 KW PMSM machine is achieved.

This paper deals with a variable speed induction generator supplying autonomous loads. The squirrel cage induction generator (SCIG) is connected to the load through back to back connected voltage source converters (VSCs) and the system is reinforced by a battery storage in order to keep the frequency and voltage constant during the variation of the loads and wind speeds. The reactive power for setting up magnetic field in this generator is drawn from the VSC. A dc-dc converter is used between back to back connected VSCs to control the battery and is maintain dc bus voltage constant. The generator torque is controlled by the generator side VSC using a field oriented control and the voltage of load side is controlled by the load side converter by means of simple d-q control. The effectiveness of the proposed system is verified using MATLAB/SIMULINK software and the results are presented and discussed for various operating conditions.

According to studies, buildings use around 40% of the total energy consumption in the world. Most of this consumed energy comes from fossil fuel, one of the sources of environmental pollution. The Net Zero Energy Building (NZEB) is an alternative to this alarming pollution. Thus the main objective of this research paper is to integrate the renewable energy sources (RES) and the utility grid with the electrical load of NZEB. To achieve this goal, power electronic converters are required to interface RES with the grid and the NZEB. A control strategy of 3-phase 4-wire inverter and dc-dc boost converter is developed to accomplish the following tasks: 1) to transfer power generated from RES to the NZEB and to inject the surplus to the grid 2) to extract the maximum power produced by the RES, to compensate harmonic currents, current unbalance load, reactive power demand and to cancel zero sequence current in the neutral wire. The proposed NZEB and its control technique are validated using the “MATLAB/Simulink program”. The results are promising.

Solid-state switch mode AC-DC converters having high-frequency transformer isolation are developed in buck, boost, and buck-boost configurations with improved power quality in terms of reduced total harmonic distortion (THD) of input current, power-factor correction (PFC) at AC mains and precisely regulated and isolated DC output voltage feeding to loads from few Watts to several kW. This paper presents a comprehensive study on state of art of power factor corrected single-phase AC-DC converters configurations, control strategies, selection of components and design considerations, performance evaluation, power quality considerations, selection criteria and potential applications, latest trends, and future developments. Simulation results as well as comparative performance are presented and discussed for most of the proposed topologies.