构网控制目标下系统故障特征及保护性能  

Fault characteristic and protection performance under grid-forming control objective

作　　者：谢华[1] 黄涛[1] 徐晓春[1] 赵青春[1] 汪楠楠[1] XIE Hua;HUANG Tao;XU Xiaochun;ZHAO Qingchun;WANG Nannan(NR Electric Co.,Ltd.,Nanjing 211102,China)

机构地区：[1]南京南瑞继保电气有限公司,江苏南京211102

出　　处：《电力自动化设备》2024年第11期210-216,224,共8页Electric Power Automation Equipment

摘　　要：分析了构网目标下的典型同步控制及故障穿越策略,提出了构网型变流器在故障分析时的等效电路。在此基础上,在相量平面分析了含构网型变流器系统稳态运行及各类故障工况下的电气量特征,指出构网控制目标下的故障特征与传统同步机系统的异同。重点针对当前电网中主流配置的电流差动保护与距离保护开展构网控制目标下的动作性能评估,并通过构建PSCAD仿真模型验证理论研究结果。分析表明,相比于传统跟网型控制,构网变流器控制技术通过模拟同步发电机的基本特性,为系统中的继电保护创造了一个相对良好的运行环境,有利于提高保护整体动作性能。Typical synchronous control and fault ride through strategies under grid-forming(GFM)control objective are analyzed,and the equivalent circuit of GFM converter during fault is proposed.On this basis,the electrical characteristics of the GFM converter system under steady-state operation and various fault con⁃ditions are analyzed on the phasor plane,and the similarities and differences between the fault characteris⁃tics of GFM control objective and that of traditional synchronous machine system are pointed out.Focusing on the current differential protection and distance protection which are mainly configured in the current power grid,the operational performance under GFM control objective is specifically evaluated,and the theoretical research results are verified by constructing a PSCAD simulation model.Analysis shows that compared with the traditional GFL control,GFM converter control technology creates a relatively good operating envi⁃ronment for relay protection in the system by simulating the basic characteristics of synchronous generators,which is conducive to improving the overall operation performance of the protection.

关 键 词：构网型变流器 故障穿越 虚拟阻抗 差动保护 比相式距离保护 继电保护 

分 类 号：TM77[电气工程—电力系统及自动化]