触发式最小电流扰动的孤岛检测方法研究

Island Detection of Triggered Minimum Current Disturbance

针对目前采取主动电流扰动法,使并网逆变器输出功率带来一定时间变化的问题,提出一种触发式最小电流扰动方式.以电网侧低压断路器分闸时产生的电弧信号作为触发条件,启动最小电流扰动量的加入,从而快速检测孤岛现象.根据IEEE Std.929-2000技术标准对该方法进行仿真和实验研究,验证方法的有效性.研究结果表明,该方法不仅没有盲区,且大大减少了加入扰动的时间,改变逆变器一直处于过载或欠载的运行状态,提高了逆变器使用寿命.

According to the periodic change of the output power of the grid connected inverter, a method of minimum current disturbance detection was proposed. When the low-voltage circuit breaker was sepa-rated from the power grid, the arc signal generated was used as the trigger condition, and the minimum current disturbance was activated to detect the phenomenon of the isolated island. According to the Std. 929-2000 IEEE technology, this method was simulated and studied, and the validity of the method was verified. The research results showed that this method not only had no blind area, but also greatly re-duced the time of adding disturbance, which changed the running state of the inverter in overload or un-der load, and improved the service life of the inverter.