Current Resonance Control in αβ Coordinate for Railway Static Power Conditioner

doi:10.3969/j.cnki.jdxb.2017.02.006

Abstract

Abstract:

Railway static power conditioner (RPC) can comprehensively solve electric power quality problems such as negative sequence，reactive power in the electrified railway.For such problems as the complex structure of controller and the poor dynamic performance of the system of conventional PI control strategy under the two phase dq rotating frame and the relatively weak ability of anti voltage sag of power supply section，a QPR control strategy of Quasi-Proportional Resonant (QPR) under the two phase αβ static coordinate is designed in this paper.A comparative study of PI and QPR control strategies of RPC is carried out from the aspects of the complexity of system structure，the dynamic performance of the system and anti voltage sag of power supply section.According to the theoretical analysis，compared with the conventional PI control strategy，in this QPR control strategy，the multiple lowpass filter treatment is avoided，no complicated transformation of rotating coordinate is needed，there are no coupling terms and feedback compensation terms affected by circuit parameters，the design of controllers is simplified，the robustness and dynamism of the system is improved and the ability of anti voltage sag of power supply section is facilitated.The correctness and effectiveness of the proposed control strategy are verified by the simulation experiments，which has good values for engineering application and popularization.

Key words: RPC, Quasi-PR control, dynamic performance；voltage sag

MA Qian，DAI Yuxing,ZHANG Min . Current Resonance Control in αβ Coordinate for Railway Static Power Conditioner[J]. Journal of Jishou University（Natural Sciences Edition), DOI: 10.3969/j.cnki.jdxb.2017.02.006.

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