High-Order Compensation Topology Integration for High-Tolerant Wireless Power Transfer

Abstract

Wireless power transfer (WPT) has been a promising way to transfer power wirelessly over certain distances through the mutual inductance (MI) of the magnetically coupled transmitter and receiver coils, providing significant benefits of convenience, safety, and feasibility to special occasions. The stable output and efficiency cannot be maintained due to the load variation and the inevitable misalignment between the magnetic couplers. High-order compensation topologies that are highly flexible in design due to more compensation elements are essential for the WPT to suppress the load variation and misalignment effects. However, due to core loss and thermal management, high-power-level and high-frequency inductor design have always been challenging for WPT systems. Space occupation and cost are other aspects to be considered for inductor design. Thus integrating these additional bulky inductors into the main coils has been a critical trial. As a result, the compensation topologies’ original input and output profiles will change or even disappear. This paper reviews the existing high-order compensation topologies and their integration principles and implementation for the WPT to obtain high misalignment tolerance. The design objectives and challenges of the integrated compensation topology in terms of misalignment tolerance capability are discussed. The relevant control systems to cope with coil misalignment and load variations are investigated. Challenges and future development of the high-tolerant WPT are discussed.

Sensor Fusion for Power Line Sensitive Monitoring and Load State Estimation

“…The determination of inrush and internal fault currents in transformers is an important feature of the transformer protection scheme proposed in [ 15 , 16 , 17 ]. In particular, in [ 15 ], a classification, in the sense of a discrimination, of internal fault currents and the phenomenon of inrush currents in a transformer is realized by using an EKF algorithm based on the monitoring of current and resistance variation on the primary winding.…”

“…In [ 16 ], a fault diagnosis in a permanent magnet synchronous generator (PMSG) is proposed and, when the fault appears, an EKF and unscented Kalman filter (UKF) are used to detect the percentage and the place of the fault. In [ 17 ], high-order compensation topology integration for high-tolerant wireless power transfer is proposed, in which description and comparison of highly flexible compensation topologies, including integration methods and relative control strategies for high misalignment-tolerant wireless power transformer systems, are proposed. All of these contributions indicate the importance of the topic as well as the variety of the possible problems that can occur and their possible solutions.…”

Optimizing performance parameters of stationary wire free power transfer circuit

“…According to the findings from [15], [16] literatures, highly flexible compensation topologies, integration methods, and relative control strategies for high misalignment-tolerant WPT system were discussed. Rehman et al demonstrated, power is conveyed using a magnetic resonance technology with a maximum efficacy of 96% at a distance of 60 cm between the two coils.…”