摘要
提出了利用电网电压中的一相电压构造虚拟的对称三相系统,跟据坐标系形成正弦和余弦信号,通过简单的积分、延时和增益环节代替其它检测方式中的低通滤波器,检测延时可减少到1/6个电源周期,使得到的要检测的补偿电流指令信号更加准确。该方法省去了锁相环,计算方法简单,在电网电压不对称条件下,仍能满足配电静止同步补偿器(DSTATCOM)负荷补偿的要求。仿真结果表明,该检测方法得到的补偿电流具有很好的补偿性能,而且证明了其实时性和有效性。
A new detection method based on synchronous reference frame is proposed. A single-phase voltage is derived and used to form virtual symmetrical three-phase system. Sine signal and cosine signal are formed in this reference frame. It substitutes the low pass filter by simple integration, delay and gain, which can reduce the detecting delay to 1/6 of source period. The compensation current is derived, which is more accurate than in unbalance voltage conditions. This method needs simple calculation without the phase-locked-loop and can meet load compensation demand of DSTATCOM under asymmetrical voltage conditions. The real-time and effectiveness of the detection method as well as better compensation of compensation currents are verified by simulation results.
出处
《电测与仪表》
北大核心
2009年第12期60-64,共5页
Electrical Measurement & Instrumentation
