Power Quality Management Strategy for High-Speed Railway Traction Power Supply System Based on MMC-RPC

Power Quality Management Strategy for High-Speed Railway Traction Power Supply System Based on MMC-RPC

Blog Article

This paper adopts the Modular Multilevel Converter Type Railway Power Conditioner (MMC-RPC) equipment to effectively manage the power quality of the high-speed railway traction power supply system including the reactive power and negative Memory Cards sequence component.Firstly, the single-phase model of the MMC was established to deduce the working characteristics of the MMC-RPC and its compensation principle for the traction power supply system with the v/v wiring transformer.Secondly, the adaptive VSG control strategy was adopted for the inverter of the MMC-RPC to provide dynamic inertial and damping support for the traction power supply system based on the virtual synchronous generator (VSG) control.

Compared with the traditional double closed-loop (DCL) and VSG controls, it has better anti-disturbance and dynamic performance.The root locus analysis of control parameters based on a small signal model shows that VSG control can provide more stability margin.Furthermore, Differential Flatness Control (DFC) was used in the inner-loop controller to ensure the stable control of the inverter and the stability was verified by the Lyapunov stability analysis.

For the rectifier of the MMC-RPC, a hierarchical three-level control strategy with system-level control, cluster-group voltage control, and inter-cluster voltage control for keeping the voltage balance Hats was adopted.Finally, simulation results on the Matlab/Simulink platform verified the effectiveness and stability of the joint control applied in the MMC-RPC.