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电网技术  2014 

基于“充分式”电流综合比幅判据的含DG配网保护

DOI: 10.13335/j.1000-3673.pst.2014.12.036, PP. 3495-3501

Keywords: 含DG配网,保护,充分式判据,比幅判据

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Abstract:

提出了一种新型“充分式”保护原理,能在现有含DG配网条件下很好地处理保护策略与成本之间的平衡。首先以含DG配网中电流幅值故障特征为例对“充分式”原理进行了深入诠释;由带制动特性的幅值差动原理推导了电流比幅判据形式,并构造了基于正序电流、负序电流和分相全电流的“充分式”综合比幅判据,该判据能在各种故障情况下自适应地优选灵敏性最高的子判据来切除故障,且具备一定的耐过渡电阻能力。判据只利用了线路两侧电流的幅值信息,不需要采样数据的严格同步,减少了通信成本。仿真结果验证了判据的有效性。

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