Power Quality Optimization Strategy Based on Current Sensorless Control of Energy Storage Railway Power Conditioner

Aiming at the stability of railway power conditioner (RPC) operation in complex environment, a large amount of regenerative braking energy in traction power supply system (TPSS) of High-speed railways cannot be effectively utilized, This paper proposes a current sensorless control strategy based on energy storage railway power conditioner (ES-RPC), which stabilizes DC bus voltage and optimizes power compensation by recovering regenerative braking energy, current sensorless control optimizes topology, saves costs, and enables fault-tolerant control in complex environments. This paper first analyzes the compensation principle of the energy storage system, then proposes a current sensorless control strategy for the energy storage device, and finally verifies the effectiveness of the scheme through simulation experiments. This solution can suppress DC bus voltage fluctuations without current sensors and improve the three-phase current harmonics negative sequence current, and finally the feasibility of the scheme is analyzed by simulation.