不正常运行 meaning in English

irregular operating
irregular working

This paper focuses on the control strategies to improve the performance of the three - phase ac - dc pwm voltage - source - converters ( vsr ) under unbalanced power supply . the problems such as negative sequences current , voltage and current harmonics and un - constant ( un - smooth ) power flow from ac to dc side are discussed in this paper . the analytical solutions for negative sequence current and harmonic current elimination are obtained by fully feed - forward of negative sequence voltage and producing a non - harmonic current command of the inner - loop
电网不平衡时，基于电网平衡为约束条件设计的三相vsr将出现不正常运行状态，比如三相vsr交流电流中出现负序分量，使交流电流严重不对称；直流电压和交流电流中出现非特征谐波分量，使直流电压和交流电流波形发生严重畸变；三相vsr从电网吸收不平衡的瞬时功率等一系列问题。