基于电压时间换相面积预测的换相失败抑制方法

提前触发控制是降低高压直流输电系统换相失败发生概率的一种重要方法,精准的提前触发是该方法抑制换相失败的关键.根据换相电压时间面积理论,提出了一种基于换相电压时间面积预测的换相失败抑制方法.该方法不仅计及了故障后直流电流的变化,还通过换相面积的测量间接计及了故障后换相角以及等效换相电抗的变化.同时,该方法具有较清晰的物理...

Commutation Failure Mitigation Method Based on Voltage-Time Commutation Area Prediction

Advanced firing control is an important method to reduce the probability of commutation failure in high voltage direct curren(HVDC)transmission systems.Accurate advanced firing is the key to mitigate commutation failure.According to the theory of commutation voltage-time area,a commutation failure mitigation method based on commutation voltage-time area prediction is proposed.This method not only takes into account the change of DC current after fault,but also indirectly takes into account the change of commutation angle and equivalent commutation reactance after fault through the measurement of commutation area.At the same time,this method has clear physical meaning and does not need to improve the commutation failure mitigation performance through complex parameter tuning.Finally,taking the CIGRE standard model in PSCAD/EMTDC as the test model,the effectiveness of the proposed method is verified under different faults.