一种煤矿供电系统正负序分解方法研究

Research of a separation method of positive and negative sequence component in coal mine power supply system

针对煤矿井下电网不平衡时产生的负序分量影响电力机车稳定运行的问题,同时为了满足机车的三相PWM整流控制需求,在分析旋转坐标系下不对称信号特征和改进型自适应陷波滤波器原理的基础上,提出了一种不对称信号正负序分解的方法。该方法将不对称信号进行旋转坐标系运算,再采用改进型自适应陷波滤波器滤除其中的2倍工频信号,以实现正负序分离。Matlab/Simulink仿真结果表明,采用该方法可以准确快速地分解出不对称信号中的正负序直流量,且可以滤除一定的谐波。

In view of problem that negative sequence components in unbalanced coal mine power system affect stable running of electric locomotive,and in order to satisfy control strategy of three-phase PWM rectifier,the characteristics of asymmetric signal under rotating coordinate system and the principle of enhanced notch filter were studied,and a separation method of positive and negative sequence component was presented.The rotating-coordinate system was used to transform the asymmetric signal and the enhanced adaptive notch filter was used to filter the two-times frequency signal in the method.The Matlab/Simulink simulation results show that the method can extract DC value of positive and negative sequence components in asymmetric signal precisely and quickly and can filter some harmonic waves.