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电网技术  2013 

逆变型分布式电源并网系统的失步保护研究

, PP. 557-561

Keywords: 分布式电源,并网系统,失步解列,视在阻抗角

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Abstract:

针对逆变型分布式电源并网系统中存在的失步问题,分析了逆变型分布式电源并网系统失步和传统旋转型电源电网失步的区别,提出了适用于分布式电源并网系统的失步保护新原理。该保护首先利用公共耦合节点处视在阻抗角偏移量的绝对值构建失步保护启动判据,其次利用视在阻抗角变化的加速度绝对值来判断失步状态。通过MATLAB/SIMULINK搭建三相光伏并网发电系统模型,进行三相短路和失步仿真。仿真结果验证了提出的失步保护原理清晰,可以准确区分逆变型分布式电源并网系统中发生三相短路故障和失步的情况,并且该保护原理不受三相短路故障的影响。

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