含逆变型分布式电源的配电网正序阻抗纵联保护

发布时间：2018-03-22 08:16

本文选题：正序阻抗　切入点：差动保护　出处：《电力系统自动化》2017年12期 　论文类型：期刊论文

【摘要】：逆变型分布式电源区别于传统电源的故障特性导致传统电流保护难以快速可靠切除故障,也影响了现有输电网保护原理直接应用于配电网的动作性能。借鉴电流差动保护原理思想,定义了正序差动阻抗,理论分析了其在区内外故障时的幅值差异,提出了一种适用于有源配电网的正序阻抗差动保护原理。为进一步改善保护性能,有效应对分支负荷的影响,构造了带制动特性的动作判据。针对区内三相金属性短路故障时保护存在的死区问题,利用故障时正序阻抗与正序电流幅值特征构造了辅助判据。与传统电流差动保护相比,所述方法无需两端数据同步采样,对通信要求较低。仿真结果验证了保护原理的有效性。
[Abstract]:The fault characteristic of the inverter distributed power supply is different from the traditional power supply, which makes it difficult for the traditional current protection to remove the fault quickly and reliably. It also affects the operational performance of the current transmission network protection principle which is directly applied to the distribution network. With reference to the principle of current differential protection, the positive sequence differential impedance is defined, and the amplitude difference in the fault within and outside the region is analyzed theoretically. The principle of positive sequence impedance differential protection for active distribution network is proposed. In order to further improve the protection performance and effectively deal with the influence of branch load, In this paper, an action criterion with braking characteristics is constructed. Aiming at the dead zone problem in the fault of three-phase gold attribute short-circuit fault, an auxiliary criterion is constructed by using the amplitude characteristics of positive sequence impedance and positive sequence current in fault time. Compared with the traditional current differential protection, The method does not require synchronous data sampling at both ends and requires less communication. The simulation results verify the effectiveness of the protection principle.
【作者单位】：电网智能化调度与控制教育部重点实验室(山东大学);国网山东省电力公司济南供电公司;
【基金】：国家高技术研究发展计划(863计划)资助项目(2012AA050213) 山东省重点研发计划资助项目(2015GGX101011)~~
【分类号】：TM773

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