The photovoltaic grid-connected inverters in traction power supply system generally operate in weak control-lable state and lack multiple coordination. To solve this problem, a voltage coordination control method for three-phase traction power supply system is proposed to ensure distributed photovoltaic to actively participate in regulating voltage of traction network while optimizing traction energy consumption. The quantitative relations between voltage and active power/reactive power are analyzed considering topology of three-phase traction power supply system with photovoltaic integration. Combined reactive power margin and coordinated control of distributed photovoltaic, a three-stage distributed voltage coordination control method is proposed to determine the compensation and curtailment priority by voltage sensi-tivity, so as to realize active control of traction network voltage by optimizing reactive power compensation and active power curtailment. Finally, effectiveness of the strategy is verified by simulation of system under multiple conditions. The simulation results show that the strategy under complex operating conditions of three-phase traction power supply system can enhance voltage regulatory capability while taking into account the utilization rate of photovoltaic energy, avoid volt-age violation of traction network, and effectively reduce network power loss. The study strengthens the traction network voltage through the effective use of photovoltaic to ensure the safe and efficient operation of locomotives.
维普
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