基于有功电压正反馈防孤岛技术研究

Research on active-voltage positive-feedback anti-islanding technology

在新能源电力系统中,并网变流器必须具有防孤岛能力,否则,电网失电后会造成电网事故。孤岛效应检测方法有主动式孤岛检测方法和被动式孤岛检测方法。被动式孤岛检测方法在电网失电后,负载有功功率和并网变流器功率匹配会失效,进而造成电网不安全。本文通过有功电压正反馈解决了这一问题,防止了被动式检测盲区的存在,仿真结果也验证了该方法的有效性和可行性,具有良好的应用前景。

In the new energy power systems,the grid converter must have anti-islanding capacity. Otherwise,it will cause power grid failure. There are two methods of the active island detection and the passive island detection for islanding effect. As regard to the passive island detection,when the grid power failure happens,the power matching of the load active power and the grid-connected converter power will become invalid,which will lead to the grid insecurity. The active-voltage positive-feedback method is used to solve this problem,and it can prevent the blind spot existence in the passive detection. The simulation results verify the effectiveness and feasibility of this method,and which has good application prospect.