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| 摘要: |
| 研究了分布式电源(DG)对过流保护灵敏度的影响规律,提出了多DG配电网的过流保护修正方案.利用单位电流法和多端口网络法对DG接入配电网后的等效电路进行了计算和分析,理论和仿真证明:单一DG对保护灵敏度的影响规律是由DG短路阻抗和接入位置决定的二次型;多DG接入系统对保护分支电流的影响特性近似看作各DG影响特性曲线的叠加;以系统短路阻抗中点为基准点,两侧按照DG短路容量顺序接入对保护分支电流的影响最小.对反时限过流保护的动作特性曲线进行正向修正和反向校核,使其保持正确的配合关系和配合裕度,从而消除DG对配电网过流保护的影响. |
| 关键词: 分布式电源 过流保护 灵敏度特性曲线 多端口网络 单位电流法 |
| DOI： |
| 分类号:TM77 |
| 基金项目:国家自然科学基金? |
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| Influence law of distributed generation on relay protection sensitivity |
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LIN Xia LU Yuping WU Xinjia
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| Abstract: |
| The influence law of DG(Distributed Generation) on the sensitivity of over-current protection is analyzed,and its revision scheme is proposed.The equivalent circuits of distribution network with DG are calculated and analyzed with the unit-current method and multi-port network method.Theory and simula- tion prove that:the mono-DG influence law is a quadratic curve,depending on DG short-circuit impedance and DG injection position;the multi-DG influence law is approximately the superimposition of all DG in- f... |
| Key words: distributed generation over-current protection sensitivity characteristic curve multi-port network unit-current method |
