基于V形曲线的定子电流限制改进方法  

Improved Method of Stator Current Limit Based on V-curve

作　　者：谢欢[1,2] 苏为民[1,2] 朱红伟 梁浩[1,2] 王斌 吴涛[1,2] 顾建嵘 

机构地区：[1]华北电力科学研究院有限责任公司,北京市100045 [2]国家电网机网协调运行仿真实验室,北京市100045 [3]南京国电南自美卓控制系统有限公司,江苏省南京市210032

出　　处：《电力系统自动化》2017年第7期144-148,155,共6页Automation of Electric Power Systems

基　　金：国家电网指南项目"发电机励磁调节器涉网性能仿真评估技术及功能规范研究"~~

摘　　要：首先通过分析现有典型定子电流限制器动作对系统电压稳定的影响,指明其存在无法保护发电机主设备安全且加剧系统电压崩溃的隐形缺陷。然后基于单机无穷大系统V形曲线特性分析,提出利用发电机机端功率因数角小于系统外功角识别发电机定子电流最小值点的判据,并给出改善定子电流限制涉网特性的控制方法及系统阻抗整定建议。最后,通过实际装置的测试结果验证了所提定子电流限制优化方法的有效性。By analyzing the influence of the typical existing automatic voltage regulator （AVR） stator current limiter on voltage stability, it is proved that not only is it unable to protect the safety of the generating set equipment, but also it will aggravate the collapse of voltage. Based on V-curve characteristics of the single-machine infinite-bus system, the stator current is reduced to minimum when the power factor of generator terminal is less than the external power angle of the system, which is the minimum stator current identification criterion. On this basis, this paper proposes a way of optimization to improve stator current limit network performance and suggestions for system impedance setting. The test results have validated the effectiveness of the proposed method.

关 键 词：定子电流限制 电压稳定 励磁调节器 V形曲线 

分 类 号：TM31[电气工程—电机]