发电机过励限制网源协调性能优化技术  

Optimization technology of source-grid coordination performance based on over excitation limiter of generator

作　　者：谢欢[1,2] 吴涛 王超[3] 梁浩 徐鹏 吴龙[4] 张广韬 XIE Huan;WU Tao;WANG Chao;LIANG Hao;XU Peng;WU Long;ZHANG Guangtao(North China Electric Power Research Institute Co.,Ltd.,Beijing 100045,China;State Grid Laboratory of Source-grid Coordinated Operation Simulation and Analysis,Beijing 100045,China;DFEM Control Equipment Co.,Ltd.,Deyang 618000,China;Nanjing NARI Relays Electric Co.,Ltd.,Nanjing 210003,China)

机构地区：[1]华北电力科学研究院有限责任公司,北京100045 [2]国家电网机网协调运行仿真实验室,北京100045 [3]东方电机控制设备有限公司,四川德阳618000 [4]南京南瑞继保电气有限公司,江苏南京210003

出　　处：《电力自动化设备》2020年第2期123-128,共6页Electric Power Automation Equipment

基　　金：张家口可再生能源示范区重大科技示范工程运维关键技术研究项目~~

摘　　要：主流励磁调节器厂家在设计过励限制反时限功能时,均依据发电机额定工况下的转子过流能力进行整定,导致系统发生故障时无法充分发挥机组的强励潜能。根据电机暂态温升理论推导得到大型汽轮发电机转子短时电流变化量与温升的关系式,进而求得发电机转子在不同负荷下的过流能力。在此基础上,提出了充分考虑发电机在不同负荷下真实过流能力且具备二次强励功能的励磁调节器过励限制反时限优化设计及实现方案,采用励磁电流计算转子温升变化量代替原来的励磁电流变化量整定反时限时间,在保障发电机安全的前提下,可最大限度地发挥机组对电网的无功支撑能力,提升电网在故障情况下的暂态稳定性。基于PSASP软件的仿真算例结果验证了所提方法的有效性和优越性。When the mainstream excitation regulator manufacturers design the inverse time limit function of over excitation limiter,they all set relevant parameters according to the rotor’s over-current capacity under the rated working condition of generator,which results in the failure to give full play to the forced excitation potential of the generator when the system occurs faults. Based on the transient temperature rise theory of motor,the relation between the short-time current variation and the rotor temperature rise of large steamturbine-generator is derived,and then the over-current capability of generator rotor under different loads is obtained. On this basis,the optimal design and realization scheme of the inverse time limit function of over excitation limiter is proposed,which fully considers the real over-current capacity of generator under different loads and the secondary forced excitation function of excitation regulator. The change of rotor temperature rise which is calculated by field current is used to set the inverse time value instead of the change of field current,which can more exert the reactive power supporting capability of the generator for the power grid and improve the transient stability of the power system in case of fault,under the premise of the safe operation of generator. Simulative results based on PSASP software verify the validity and superiority of the proposed method.

关 键 词：励磁调节器 汽轮发电机 过励限制 散热模型 再强励功能 网源协调 性能优化 暂态稳定性 

分 类 号：TM761[电气工程—电力系统及自动化]