A Dual-Coupled Double-LCC System With the Capability of Misalignment Tolerance Improvement for Wireless Charging Substation Inspection Robots

This article presents a wireless power transfer system for substation inspection robots. Employing a dual-coupled double inductor–capacitor–capacitor (LCC–LCC) compensation topology, the system aims to address the prevalent challenge of misalignment tolerance improvements. It reveals that the system's output is predominantly influenced by the denominator parameter (i.e., λ), which is the sum of two dominant factors (i.e., λ 1 and λ 2 ). Specifically, with larger misalignment, the changing trends of λ 1 and λ 2 are opposite. As a result, their sum (λ) can remain constant by balancing the decrement (increment) in λ 1 with the increment (decrement) in λ 2 , thereby achieving a relatively stable power transfer during a certain misalignment range. An experimental prototype is built to verify the effectiveness of the proposed system. The experimental results show that the output current is stable regardless of load variations, and it can also remain stable within the misalignment range of −100 to 100 mm in y-axis and 50 to 90 mm in z-axis.