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含DG配网电流幅值差异化保护方案

, PP. 164-140

Keywords: 分布式发电,电流幅值,制动特性,配电网保护

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Abstract:

提出基于故障线路两侧电流幅值差异比较的配电网新型保护方案,适于含分布式电源的配电网络。首先对分布式配电网发生故障时,线路两侧故障电流幅值特性进行分析,得出在现有的分布式电源容量渗透率规定以及逆变型分布式电源对输出电流幅值限制的条件下,故障线路两侧电流幅值不相等且差异较明显的结论。以此为基础,提出新型的基于故障电流幅值差异的保护方案,为保证内部故障的灵敏性,外部故障及正常运行时保护的可靠性,提出相应的动作-制动特性方程。新方案借鉴传统差动保护制动判据的形式,但制动特性方程仅需电流幅值信息而无需相量的比较,在通信自动化水平较低的分布式配电网中更易实现。仿真证明了本方案的合理性和有效性。

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