A Design Method of Compensation Circuit for High-Power Dynamic Capacitive Power Transfer System Considering Coupler Voltage Distribution for Railway Applications

Jianying Liang,Donghua Wu,Jin Yu

doi:10.3390/electronics10020153

Abstract

Capacitive power transfer (CPT) is a promising method to solve the problems caused by the traditional Pantograph-catenary contact power supply for railway applications. In contrast, the CPT system suffers a broken risk because of the small coupling capacitor. This paper has analyzed the CPT coupler’s voltage distributions for dynamic CPT systems when high power is required in real railway applications. The triangle relationship among the coupler voltages is derived. The circuit of the CPT system to accolated the coupler voltage is analyzed. Then, the compensation parameters are given. With the adopted LCLC-CL topology, the design process is presented by considering the coupler voltages. An experimental setup is conducted to validate the proposed design method. The experimental results show that the system can achieve 3 kW output power with 92.46% DC-DC efficiency and the voltage distribution aggress well with the designed values.

Highlights

IntroductionThe railway power supply system mainly uses the pantograph-catenary (PC) method to power the moving locomotives [1,2]
Capacitive Power Transfer SystemTraditionally, the railway power supply system mainly uses the pantograph-catenary (PC) method to power the moving locomotives [1,2]
This paper proposes a compensation circuit design method for the High-power dynamic Capacitive power transfer (CPT) system to charge the railway applications, considering the coupler volage distribution

Summary

Introduction

The railway power supply system mainly uses the pantograph-catenary (PC) method to power the moving locomotives [1,2]. The pantograph on the top of the locomotive uses sliding friction to get power from the already laid catenary. This kind of sliding flow has great hidden dangers: (1) Limits the increase of locomotive speed. The carbon brush on the pantograph obtains electricity by rubbing on the contact net. The locomotive speed must be limited within a specific range to ensure the normal working life of the carbon brushes. It is necessary to propose a new power supply method to completely solve the problem of the traditional pantograph-net friction power supply and ensures the safe and reliable operation of rail transit power supply systems

Results

Discussion

Conclusion