摘要
微电网由大量分布式电源组成,且具有灵活、复杂的运行方式,传统配电网保护难以满足其对可靠性与稳定性的要求。基于微电网的拓扑结构和故障特性,该文设计并提出微电网多层级协同反时限保护方案。该方案将微电网保护区域按故障影响扩散分为中心层、区域层和系统层,提出基于正序电流相量的反时限差动电流保护,通过差动电流确定故障线路分段,并利用差动电流的反时限特性计算保护动作时间,按故障严重程度确定动作时间,以此为基础,研究微电网多层级协同保护算法。为降低非周期分量对保护相量的影响,提出反时限差动电流保护的相量计算改进算法。该文所提保护方案实现了多层级协同配合切除故障,提高了微电网保护的故障区域判别与快速动作能力,且在并网和孤岛两种运行方式具有自适应配置能力。利用PSCAD/EMTDC进行仿真分析,验证了保护方案的有效性和可靠性。
Due to the integration of large-scale distributed generation and the flexible operation modes,microgrids require for a much higher demand on the reliability and stability.Thus,the traditional distribution network protection is difficult to meet the requirements of microgrid operation.According to the topology and fault characteristics of microgrids,this paper proposes a multi-layer collaborative inverse-time protection scheme.The protection scheme is divided into the core layer,the regional layer and the system layer.It puts forward an inverse-time differential current(ITDC)protection based on the positive sequence current phasor.Then the principle,criterion and matching method of the ITDC protection are studied.Based on the ITDC protection,the scheme designs a multi-layer cooperative protection algorithm.Besides,in order to reduce the influence of the non-periodic components on the calculation of phasor,an improved algorithm for phasor calculation is proposed.The protection scheme achieves the coordination of the core layer primary protection,regional layer backup protection and system layer interconnection protection.It has an adaptive capability for the grid-connected mode and islanding mode.The simulation model is established in PSCAD/EMTDC,and the effectiveness and reliability of the protection scheme is verified by results.
作者
黄文焘
邰能灵
刘剑青
马洲俊
王杰
Huang Wentao;Tai Nengling;Liu Jianqing;Ma Zhoujun;Wang Jie(Key Laboratory of Control of Power Transmission and Conversion Ministry of Education,Shanghai Jiao Tong University,Shanghai,200240,China;Nanjing Power Supply Company of State Grid Jiangsu Electric Power Co.Ltd,Nanjing,210019China)
出处
《电工技术学报》
EI
CSCD
北大核心
2021年第3期623-633,共11页
Transactions of China Electrotechnical Society
基金
国家自然科学基金青年基金项目(51807117)
上海市教委科研创新重大项目(2019-01-07-00-02-E00044)
国家重点研发计划(2019YFE0102900)资助。
关键词
多层级协同保护
反时限差动电流保护
并网保护
相量改进算法
微电网
Multi-layer collaborative protection
inverse-time differential current protection
interconnection protection
improved phasor calculation algorithm
microgrids
