电流差动保护在逆变型新能源场站送出线路中的适应性分析
发布时间：2018-11-06 12:46
【摘要】：新能源电源通过电力电子装置并网,其故障特性受控制策略影响而发生根本性变化,传统继电保护原理存在适应性问题。送出线路作为新能源场站电力外送的关键通道,其主保护电流差动保护能否正确动作对于新能源高效利用和系统安全运行十分重要。针对逆变型新能源场站,推导了逆变型新能源电源短路电流表达式,分析了各相短路电流之间的相位关系及其影响因素。在此基础上,分析了送出线路发生不对称短路时电流差动保护在并网系统为强、弱两种情形下的动作性能。研究结果表明,送出线路发生两相短路时,差动保护在并网系统为弱系统时存在拒动的风险、为强系统时灵敏性下降但不会拒动;送出线路发生接地故障时,零序电流的存在使得差动保护在并网系统为强、弱系统时均能可靠灵敏动作。实时数字仿真器(RTDS)试验验证了理论分析。研究结论为逆变型新能源场站送出线路主保护配置提供了参考。
[Abstract]:The fault characteristics of the new energy power supply are fundamentally changed by the control strategy when it is connected to the grid by the power electronic device. The traditional relay protection principle has the problem of adaptability. The main protection current differential protection is very important for the efficient utilization of new energy and the safe operation of the system. In this paper, the expression of short-circuit current of inverter new energy power supply is derived, and the phase relationship between each phase and its influencing factors are analyzed. On this basis, the performance of the current differential protection in the grid-connected system is analyzed under the condition of asymmetric short circuit of the transmission line. The results show that when the two-phase short circuit occurs in the transmission line, the differential protection has the risk of rejection when the grid-connected system is weak, and the sensitivity of the strong system decreases but it will not. The existence of zero sequence current makes the differential protection can operate reliably and sensitively in the grid-connected system when the grounding fault occurs in the transmission line. The (RTDS) test of real time digital simulator verifies the theoretical analysis. The research results provide a reference for the main protection configuration of the transmission line of the inverter new energy field station.
【作者单位】： 新能源电力系统国家重点实验室(华北电力大学);国网浙江省电力公司经济技术研究院;国网江西省电力公司南昌供电分公司;
【基金】：国家重点研发计划资助项目(2016YFB0900503) 国家电网公司科技项目(5211JY16000U) 中央高校基本科研业务费专项资金资助项目(2016ZZD01)~~
【分类号】：TM773
[Abstract]:The fault characteristics of the new energy power supply are fundamentally changed by the control strategy when it is connected to the grid by the power electronic device. The traditional relay protection principle has the problem of adaptability. The main protection current differential protection is very important for the efficient utilization of new energy and the safe operation of the system. In this paper, the expression of short-circuit current of inverter new energy power supply is derived, and the phase relationship between each phase and its influencing factors are analyzed. On this basis, the performance of the current differential protection in the grid-connected system is analyzed under the condition of asymmetric short circuit of the transmission line. The results show that when the two-phase short circuit occurs in the transmission line, the differential protection has the risk of rejection when the grid-connected system is weak, and the sensitivity of the strong system decreases but it will not. The existence of zero sequence current makes the differential protection can operate reliably and sensitively in the grid-connected system when the grounding fault occurs in the transmission line. The (RTDS) test of real time digital simulator verifies the theoretical analysis. The research results provide a reference for the main protection configuration of the transmission line of the inverter new energy field station.
【作者单位】： 新能源电力系统国家重点实验室(华北电力大学);国网浙江省电力公司经济技术研究院;国网江西省电力公司南昌供电分公司;
【基金】：国家重点研发计划资助项目(2016YFB0900503) 国家电网公司科技项目(5211JY16000U) 中央高校基本科研业务费专项资金资助项目(2016ZZD01)~~
【分类号】：TM773
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1 袁敬中;高压全线路快速纵联电流差动保护[J];华北电力技术;2003年07期
2 袁荣湘,陈德树,马天皓,张哲,尹项根;基于相关分析的暂态电流差动保护的原理与性能研究[J];电网技术;2000年04期
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