发电机励磁辅助控制功能对特高压直流送端动态无功支撑能力的影响研究  

Study on Effect of Generator Excitation Auxiliary Control on Dynamic Reactive Power Support Capability of UHVDC Transmission Sending System

作　　者：赵峰[1] 吴涛[1] 谢欢[1] 代倩 梁浩[1] ZHAO Feng;WU Tao;XIE Huan;DAI Qian;LIANG Hao(North China Electric Power Research Institute Co. Ltd., Xicheng District, Beijing 100045, China;China Electric Power Research Institute Co. Ltd., Haidian District, Beijing 100192, China)

机构地区：[1]华北电力科学研究院有限责任公司,北京市西城区100045 [2]中国电力科学研究院有限公司,北京市海淀区100192

出　　处：《电网技术》2018年第7期2262-2269,共8页Power System Technology

基　　金：国家电网公司科技项目大规模新能源与受端常规电源联合发电控制技术研究与应用(XT71-16-035)~~

摘　　要：发电机励磁调节器的精确建模是分析发电机无功支撑能力的基础。针对现有研究中缺乏考虑发电机励磁辅助控制功能对直流近区发电机动态无功支撑能力的影响这一不足之处,分析了发电机过励限制、低励限制、定子电流限制、最小励磁电流限制等励磁辅助控制功能对直流近区发电机无功特性、换流站母线电压的影响。实际特高压直流送端大电网仿真计算结果表明,发电机低励限制和最小励磁电流限制考虑与否会影响特高压直流送端暂态、稳态过电压水平,发电机过励限制、定子电流限制会影响特高压直流送端长期低电压的动态过程。发电机励磁辅助控制功能的考虑与否对于特高压直流送端近区电网的电压稳定、功角稳定分析结果有重要的影响。建议在特高压直流送端稳定分析中,发电机励磁模型采用包含各个辅助控制功能的详细励磁模型。Accurate modeling of generator excitation controller is the basis for analyzing reactive power support capability of generator. In view of shortcomings of existing researches, influence of generator excitation auxiliary control on dynamic reactive power support capability of generators in UHVDC sending system is studied. Influence of over-excitation limiter, stator current limiter, under-excitation limiter and minimum excitation current limiter on generator reactive power and UHVDC converter station bus voltage is analyzed. Results show that under-excitation limiter and minimum excitation current limiter affect transient, steady-state overvoltage level of the UHVDC sending system. Over-excitation limiter and stator current limiter affect dynamic low-voltage process of the UHVDC sending system. Consideration of generator excitation auxiliary control has important influence on voltage stability and power angle stability analysis of the UHVDC sending system. It is recommended that generator excitation model adopts a detailed excitation model including various auxiliary control functions in UHVDC stability analysis.

关 键 词：发电机励磁辅助控制 特高压直流送端 电压稳定 无功支撑能力 

分 类 号：TM721[电气工程—电力系统及自动化]