中文摘要：

为了保证电力系统安全稳定运行,需要对电网无功电流进行补偿,因效果取决于无功电流检测的精确性和实时性,在三相电网电压不对称时,传统ip-iq检测法提取的无功电流存在相位差和延时问题,影响了无功补偿的效果。为提高检测精度,提出一种改进的ip-iq无功电流检测方法。改进方法通过对三相电源电压、电流的检测,并将信号延迟算法与幅值积分器相结合,提取被测电压、电流的正序基波分量,再经过简单的坐标变换即可得到无功电流。既避免了三相电网不对称时相位差的检测,又消除了低通滤波器产生的延时问题。采用MATLAB仿真软件进行了建模仿真。仿真结果表明,改进的ip-iq无功电流检测方法明显提高了检测精度和实时性。

英文摘要：

In order to ensure the safe and stable operation of power system,it is necessary to compensate reactive current of power grids. The effect depends on the accuracy and real-time performance in reactive current detection.In the case of asymmetrical three-phase voltage,there exist errors and the delay problems in the traditional ip-iq detecting method,and effect of static reactive compensation. Therefore,an improved detecting method is put forward to detect the three-phase power supply voltage and current,the signal delay algorithm combined with amplitude integrator to extract the positive sequence of the measured voltage current. Then the idle current is obtained by a coordinate transformation. It can not only avoid detection of phase errors in the asymmetric three-phase power grid,but also eliminate the delay problem of the low-pass filter. Simulation results show that the improved reactive current can improve the detection accuracy and real-time.