Grid-forming inverters (GFMIs) are crucial for grids experiencing higher penetration of photovoltaics. Uncertainties in the utility grid make the GFMI system unstable. Thus, using a virtual synchronous generator (VSG) enhances system stability and grid stiffness by reducing the rate of change of frequency (RoCoF). Thus to deal with harmonics and oscillations caused by various uncertainties in the system, this article proposes an elevated adaptive integrated control strategy (EAICS) for a three-phase grid-tied VSG (TPGTVSG) system, which integrates a modified proportional resonant current (MPRC) controller and a phase-corrected reference current (PCRC) generator to further improve overall system performance. The MPRC controller also includes an adaptive power control for the VSG, which helps to reduce the injected grid current harmonics and dampens the power and frequency oscillations under distorted/unbalanced grid voltage conditions. Whereas, the PCRC serves the purpose of synchronization without a dedicated synchronization unit, thereby making the TPGTVSG self-synchronizing and thus reducing the computational burden and complexity. Furthermore, the grid frequency adaptability of the TPGTVSG system is enhanced by suitably modifying the control coefficients used in the VSG power control loop, thereby stabilizing the power oscillations. Additionally, the article also presents a small signal modeling analysis of VSG to examine how parameter perturbations affect power and system frequency. Finally, the suggested EAICS controller response to the system is examined experimentally using a laboratory prototype.

This article presents an off-board bidirectional battery charger for electric vehicles (EV s) that has been designed to perform various tasks beyond simply charging electric vehicles (EVs) like Grid-to-Vehicle (G2V), Vehicle-to-Grid (V2G) and Vehicle-to-Home (V2H) technologies and also improving the grid power quality (PQ). During charging mode, the G2V mode of operation takes place. Here, power flows from the utility grid to the vehicle with sinusoidal current and also maintains a unity power factor. Similarly, in discharging mode, the V2G mode of operation takes place. In this case, the power is delivered from the batteries of the EV to the utility grid. During the V2H mode of operation for the period of grid disruptions, EV s provide an uninterrupted power supply to domestic loads. The adopted topology and control technique is implemented to operate the laboratory-developed prototype electric vehicle charger (EVC) to verify the simulation results at various operating conditions.

This research paper discusses a bidirectional DC-DC fast charger (or level-3 charging system) to obtain a high-power level. However, two types of EV charging systems are available, i.e., an on-board charging system and an off-board charging system. For dc fast charging, it is essential to use the off-board charger to reduce the volume and weight of EVs significantly. This charger charges the EV battery using a Dual Active Bridge (DAB) topology for the DC-DC converter, which is better for bidirectional power flow, power density, and efficiency and has less passive component count than resonant circuits using inductors and capacitors. Furthermore, zero-voltage switching (ZVS) from light to medium load is challenging using Single-Phase Shift (SPS) control. This improves system reliability and efficiency by decreasing switch-bridge crosstalk caused by hard switching-ON. Optimizing phase shift reduces switch voltage stress. Double Phase Shift (DPS) and Triple Phase Shift (TPS) control may work but have disadvantages, like larger switching-OFF currents. Moreover, SPS is discussed with CCCV charging. The design for DAB includes two different voltage and current control loops using PI controllers to control the power flow between the two H-bridges of the DAB converter to charge the battery. All the results are presented, obtained from simulations done on MATLAB.

The grid-connected photovoltaic system (GCPVS) with distribution static compensator (DSTATCOM) capabilities plays a key role in providing an alternative way of power generation with enhanced power quality (PQ). For GCPVS, a three-phase, single-stage is considered in which local loads are connected at the point of common coupling (PCC). These loads create nonlinearities in the current, which are mitigated by GCPVS, thus enhancing the PQ. For the effective operation of GCPVS in satisfying the load requirement and feeding excess available PV power to the grid, a Weibull M-transform least mean square (WMLMS)- based control scheme is proposed in this article. This control scheme enables GCPVS to draw maximum power from the PV array, compensate for the load reactive power, load balancing, mitigate load current harmonics, and achieve sinusoidal grid currents at the unity power factor (UPF). However, during night time as PV power is absent, the system performs to operate as DSTATCOM. The GCPVS is developed using MATLAB/Simulink and simulated. The responses of GCPVS during various cases are found satisfactory, and THD of the grid currents are bound to IEEE-519-2022 standard.

A grid connected photovoltaic (PV) based electric vehicle (EV) charging station is proposed that provides uninterrupted power supply to EV and non-linear domestic load. Here, PV is responsible for power transfer to the EV and household load. The proposed Normalized Gaussian Kernel Least Mean Square (NGKLMS) control technique mitigates several power quality (PQ) issues arising due to non-linear load, unbalanced load or change in solar irradiance (G). This technique lowers the harmonic content of the grid parameters based on IEEE 519 standard and maintains unity power factor (UPF). The superiority in performance of the proposed control is validated by comparing with conventional techniques like Least Mean Fourth (LMF) and Least Mean Square (LMS) in MATLAB/SIMULINK.

In a DC microgrid, energy management among distributed renewable energy sources, energy storage and load have been a major challenge. For the proper management of energy, a control scheme for bidirectional Quasi Z-Source DC-DC Converter (BQZSDC) has been presented in this paper. BQZSDC is buck-boost type of bidirectional DC-DC converter. It helps to integrate energy storage systems with energy sources and load. This paper presents the performance analysis of BQZSDC with dual-loop proportional integral control for regulating battery current and the load voltage. The controller parameters are tuned using stability boundary locus method based on desired phase margin. The performance of the controller has been validated in both discharging (Boost) and charging (Buck) mode. The MATLAB simulation results shows that the load voltage and battery current is satisfactorily regulated under load current variation in both discharging and charging modes.

This paper proposes a cascaded transformer coupled multilevel inverter which acts as a shunt active filter for harmonic mitigation under different supply main condition. The proposed multi level inverter operates with a single DC-link capacitor which signifies equivalent power circulation between the modules of the inverter. The complete architecture of the developed topology is elaborated along with its control application. For harmonic current extraction an Empirical mode decomposition based control is applied to extract the fundamental load current which helps in estimating the reference current. The modulation signals are created by comparing the reference with the phase shifted PWM technique. Finally the presented control technique is applied in the developed topology of Shunt active filter and verified by simulation and hardware results.

This paper proposes a multilevel cascaded full-bridge interleaved buck inverter (CFBIBI) based active power filter using Type 1 fuzzy logic controller (T1FLC) and multicarrier PWM id-iqcontrol scheme with no shoot-through phenomenon. The conventional cascaded full-bridge inverter is comprised of multiple numbers of modular inverter cells and every single modular inverter cell consists of two power devices in each leg, however it still suffers from the shoot-through phenomenon with decreased reliability. As no shoot-through occurrence in each modular full-bridge interleaved buck inverter of its cascaded multilevel inverter, there is copious improvement in the reliability as likened to other cascaded inverters. Additionally, the dead time introduction does not necessitate in the full bridge interleaved buck inverter, as in conventional, which easily pushes the theoretical limit of duty cycle, and hence full energy transfer takes place to the load by pulse width modulation (PWM). The performance of multilevel cascaded full-bridge interleaved buck inverter (CFBIBI) along with the application as a shunt active power filter (APF) has been described in detail for the different voltage source condition. Simulation and OPAL-RT experimental results are presented for the validation of this multilevel cascaded full-bridge interleaved buck inverter based shunt active power filter.

The “shoot-through” failure glossary define as the rush of current that occurs while both the devices are ON at the same time of a particular limb, which is one of the most perilous failure modes encountered in conventional inverter circuits of the active power filter (APF). Shoot-through results in reduced efficiency, typical ringing, increased temperature in power switches and higher Electromagnetic Interference (EMI). However, these conventional inverters suffer from “shoot-through”. To avert the “shoot-through”, dead time control could be added but it deteriorates the harmonic compensation level. A novel 3-phase 4-wire active power filter based on interleaved buck (IB) DC-to-AC converters with the instantaneous active and reactive current component (id-iq) control strategy is proposed here to mitigate the harmonics having PI and fuzzy logic (FLC) controllers. This interleaved buck (IB) DC-to-AC converter is augmented conventional phase leg configuration and is innately immune to “shoot-through” phenomenon, with the elimination of special protection features required in conventional inverter circuits. Here in this paper, a comparison has been made on the compensation capabilities of the 3-phase IB-APF with the PI and fuzzy logic controller (FLC) used by id-iqcontrol strategy under different supply voltage condition.

In this paper the shunt active filter (SHAF) is used to improve the power quality of the electrical network by mitigating the harmonics with the help of different fuzzy membership functions (M.F.s). The proposed SHAF with different fuzzy M.F.s is able to eliminate the uncertainty in the system. On the other side fuzzy logic controller (FLC) has widened its applicability to many engineering fields and offer satisfactory results for a wide variety of operating conditions. It helps in fulfilling the need of perfection, such as stability and robustness to every system. All this motivated to adopt fuzzy logic controller for SHAF applications. By using different fuzzy M.F.s, SHAF gains outstanding compensation abilities. To validate the proposed approach, the system is implemented on a real time digital simulator and adequate results are reported for its verifications.