交流继电保护动作性能在多馈入直流系统中适应性仿真分析  

Adaptive Simulation Analysis of AC Relay Protection Performance in Multi-infeed DC System

作　　者：李宽 刘震 牛健飞 李晨昊 李娜 LI Kuan;LIU Zhen;NIU Jianfei;LI Chenhao;LI Na(State Grid Shandong Electric Power Research Institute,Jinan 250003,China;State Grid Weihai Power Supply Company,Weihai 264200,China;State Grid Binzhou Power Supply Company,Binzhou 256600,China)

机构地区：[1]国网山东省电力公司电力科学研究院,山东济南250003 [2]国网山东省电力公司威海供电公司,山东威海264200 [3]国网山东省电力公司滨州供电公司,山东滨州256600

出　　处：《山东电力技术》2022年第2期23-28,53,共7页Shandong Electric Power

基　　金：国家电网有限公司科技项目“核心元器件对继电保护装置性能影响评估及测试研究”(2100-201955023A-0-0-00)。

摘　　要：直流系统故障时的输出特性与传统同步机存在差异,如直流系统的非线性、低惯量等。直流系统的接入给传统交流保护的理想工作环境带来了诸多不确定性因素,尤其是多馈入直流情况下,这种不确定性因素可能通过网络互相耦合,更加复杂。但目前直流系统并没有适合交流保护研究的等值电路,难以通过定量解析方式进行研究。鉴于以上情况,建立基于实际系统参数的仿真模型,利用大量仿真数据对交流保护的适应性进行验证是比较可行的方案。建立山东电网500 kV及以上电网模型,接入沂南、广固、胶东三个直流落点,通过仿真数据对多馈入直流系统的交流电气特征以及差动、距离、零负序方向等典型交流保护元件的动作特性进行详细分析,为多馈入直流输电系统交流继电保护动作行为分析提供了理论依据。The output characteristics of DC system are different from those of traditional synchronous machine power system,such as nonlinearity and low inertia of DC system.The access of DC has brought many uncertain factors to the ideal working environment of traditional AC protection,especially in the case of multi-infeed DC,uncertain factors may be coupled with each other through the network,which is more complex.Howerver,there is no equivalent circuit suitable for AC protection research in DC system at present,which is difficult to be studied by quantitative analysis.It is feasible to establish a simulation model based on actual system parameters and verify the adaptability of AC protection by using a large number of simulation data.A 500 kV and above power grid model of Shandong power grid was established,which is connected to three DC drop points of Yinan,Guanggu and Jiaodong.Through the simulation data,the AC electrical characteristics of multi-infeed DC system and the action characteristics of typical AC protection elements such as differential,distance and zero negative sequence direction were analyzed in detail,It provides a theoretical basis for the analysis of AC relay protection action behavior in multi-infeed DC transmission system.

关 键 词：继电保护 多馈入直流系统 差动保护 距离保护 零负序方向保护 

分 类 号：TM732[电气工程—电力系统及自动化]