双馈抽水蓄能机组无功调节极限能力研究  

Research on Limit Capacity of Reactive Power Regulation of Doubly-fed Pumped Storage Unit

作　　者：张慧中 崔学深[1] 桂中华 倪晋兵 孙晓霞 李善颖 许国瑞[1] ZHANG Huizhong;CUI Xueshen;GUI Zhonghua;NI Jinbing;SUN Xiaoxia;LI Shanying;XU Guorui(North China Electric Power University,Beijing 102206,China;Pumped-storage Technological&Economic Research Institute State Grid Xinyuan Company Ltd.,Beijing 100761,China;State Grid Jibei Electric Power Research Institute,Beijing 100045,China)

机构地区：[1]华北电力大学,北京102206 [2]国网新源控股有限公司抽水蓄能技术经济研究院,北京100761 [3]国网冀北电力有限公司电力科学研究院,北京100045

出　　处：《大电机技术》2023年第2期1-7,29,共8页Large Electric Machine and Hydraulic Turbine

基　　金：国家电网公司总部科技项目“变速抽水蓄能机组无功支撑与系统阻尼提升技术研究”资助(5108-202218280A-2-302-XG)。

摘　　要：由于可变速双馈抽水蓄能机组(doubly-fed pumped storage unit, DFPSU)的运行不再受到静稳极限的限制,其吸收无功功率的进相能力相较于传统同步发电机来讲得到了增强,但整体调节能力又将受限于定子绕组温升、转子绕组温升和最大转子电压。本文采用了更有利于DFPSU功率分析的Γ型等效电路,将机组运行过程中的定转子功率、损耗功率重新组合分析,得出了限制机组运行功率极限的主要因素。根据理论推导和DFPSU机组实际参数首先画出了以定子电流和转子电流极限为边界的P-Q圆图,进而专门探究双馈电机最大转子电压极限在不同转差条件下的运行边界和无功调节极限,分析了转差率s和转子电压极限圆图之间的关系。最后通过在MATLAB/Simulink中搭建仿真模型验证了DFPSU无功调节极限理论边界的正确性,根据某可变速抽水蓄能机组实际参数的仿真结果,发现当转差率较大时转子电压极限将会成为限制无功调节范围的关键因素。As the operation of the doubly-fed pumped storage unit(DFPSU) is no longer limited by the static stability limit, its progressive ability to absorb reactive power is enhanced compared with the traditional synchronous generator. However, the overall regulation capacity will be limited by the temperature rise of stator winding, rotor winding and maximum rotor voltage. In this paper, a type equivalent circuit which is more beneficial to power analysis of DFPSU is adopted to recombine and analyze the power of fixed rotor and power loss during the operation of the unit, and the main factors limiting the power limit of the unit are obtained. According to the theoretical derivation and the actual parameters of DFPSU unit, the P-Q circle diagram with stator current and rotor current limit as the boundary is firstly drawn, and then the operating boundary and reactive power regulation limit of maximum rotor voltage limit of doubly-fed motor under different slip conditions are specially explored, and the relationship between slip rate s and rotor voltage limit circle diagram is analyzed. Finally, a simulation model is built in MATLAB/Simulink to verify the correctness of the theoretical boundary of the reactive power regulation limit of DFPSU. According to the simulation results of the actual parameters of a variable speed pumped storage unit, it is found that when the slip is large, the rotor voltage limit will become the key factor limiting the reactive power regulation range.

关 键 词：双馈变速机组 抽水蓄能 无功调节 无功极限 转差限制 

分 类 号：TM346[电气工程—电机]