A novel method for evaluating compensation networks in IPT systems is proposed for a fair comparison. An optimal control strategy is adopted in the comparison to ensure operation under optimal conditions. Results indicate efficiency boundary can be used as a powerful tool for intuitive evaluation of the compensation networks.

Dynamic inductive power transfer (IPT) can be used to charge moving electric vehicles (EVs) through the magnetic coupling between primary coils in a road with secondary coils onboard an EV. However, consistency in charging requires stability of power transfer, which is significantly affected by variations in the alignment between conventional primary and secondary coils in relative motion. This paper proposes a new coil structure for dynamic IPT systems with a high degree of tolerance to coil misalignment. The reluctance model is presented for the proposed coil to further investigate the influence of coil widths on the mutual inductance (M). Results indicate that a trade-off exists between improving M and tolerance to coil misalignment.

This paper presents a new IPT compensation topology that can be operated at two different frequencies to form either primary series and secondary parallel (S-P) or primary parallel and secondary parallel (P-P) compensation. Model are presented to demonstrate how this transformation between S-P and P-P compensations with dual frequency control. The simulated results of a 1 kW IPT system have verified that the proposed system can remain output power with phase-shift modulation (PSM) and allows for efficient power transfer despite large pad misalignments by operating at different compensation.

This paper proposes a low-cost inductive power transfer (IPT) system, comprising an uncompensated foil primary coil and a compensated vertical Litz-wire secondary coil structure, for stationary electric vehicle (EV) charging applications. A mathematical model is presented for the proposed system, and a 2 kW case study shows comparable performance to a dual-compensated IPT system.

The widespread integration of Distributed Generation (DG) and new loads such as Electric Vehicles (EVs) into power distribution networks presents substantial technical challenges for network operators, such as voltage fluctuations and phase unbalance. These can be addressed by many power electronic devices with advanced control strategies, including the Hybrid Transformer (HT). This paper presents a new three-phase HT concept which can perform multiple functions, including voltage regulation and voltage balancing, to address power quality problems in distribution networks. Theory and control strategy are presented, along with simulated results incorporating an unbalance-tolerant control scheme and 3D Space Vector Modulation, to demonstrate the validity of the proposed HT topology. Its advantages include being retrofittable to existing distribution transformers, not requiring bulky low-frequency converter magnetics, having a low semiconductor component count, and allowing reduced DC-link capacitances. This makes it cost-effective, compact and light weight in comparison to the existing topologies that provide similar functionality.

This paper presents a predictive torque control (PTC) strategy for a three-level simplified neutral point clamped (3L-SNPC) inverter-fed interior permanent magnet synchronous motor drive. The motor torque is predicted from the stator currents and motor speed information. Then, the most appropriate voltage vector that minimizes the predetermined cost function and hence, the torque error is selected. The concept of the virtual voltage vectors is utilized to overcome the drawback of fewer available voltage vectors in the 3L-SNPC inverter. Furthermore, the issue of capacitor voltage imbalance is addressed. The simulation results included prove the effectiveness of the proposed method.

Traditionally, the power supplies employed in low voltage and very high current applications, such as electroplating, use line frequency transformers and thyristor-based control circuits. Such power supplies are bulky and inefficient, taking up valuable plant area and incurring significant operational costs. This study proposes an efficient and compact power supply suited to high current and low voltage applications. It uses a multi-level converter to convert line frequency input waveforms to a high frequency in a low cost and low loss manner. The output of the multi-level converter feeds an AC L-C-L resonant network to implement an easily controllable current source that, in turn, feeds a high current output stage. The output stage is modular, consisting of a number of easily constructed transformers and rectifier circuits that share voltage and current stresses. The proposed topology is modeled and simulated results are presented to verify its performance.