双馈式可变速抽水蓄能机组无功特性分析  

Reactive Power Characteristic Analysis of Doubly-fed Adjustable-speed Pumped Storage Unit

作　　者：王欣竹 韩民晓[1] Bitew Girmaw Teshager WANG Xinzhu;HAN Minxiao;Bitew Girmaw Teshager(State Key Laboratory of Alternate Electrical Power System With Renewable Energy Sources (North China Electric Power University), Changping District, Beijing 102206, China)

机构地区：[1]新能源电力系统国家重点实验室(华北电力大学)

出　　处：《电网技术》2019年第8期2918-2924,共7页Power System Technology

基　　金：智能电网保护和运行控制国家重点实验室资助;国家电网公司科技项目:“综合多类措施的水电汇集高占比外送电网频率紧急协控系统研发”~~

摘　　要：分析双馈式可变速抽水蓄能机组的无功输出特性,对于提高机组并网运行能力及电力系统电压稳定性具有重要意义。提出了一种基于V形曲线分析机组定子侧无功特性及调节机理的方法。建立双馈电机等效电路及数学模型,分析不同运行工况下双馈电机各电气量的相量关系,得到定子电流随转子电压变化的V形曲线。研究了不同运行工况下V形曲线变化情况,重点分析了有功功率、转差率对V形曲线变化影响。基于Matlab/Simulink平台分别进行稳态和动态仿真验证,仿真结果表明双馈异步电机具备类似于同步电机的无功调节特性,证明了V形曲线法对于系统无功特性分析结果的正确性和有效性。Study on the reactive power characteristics of doubly-fed adjustable-speed pumped storage unit is important to improve its grid-connected operation capability and voltage stability of power system. This paper proposes a novel method to analyze the reactive power characteristics and regulation mechanism on the stator side of the doubly-fed adjustable-speed pumped storage unit. On the basis of equivalent circuit and mathematical model, the relationship of the electrical phasors of doubly-fed induction machine, called V-curve, is analyzed and the relation curve of stator current and rotor voltage is obtained. Based on the V-curve, the reactive power characteristics under different operation modes are analyzed, and the effect of slip ratio on reactive power output is also discussed. Finally, steady and dynamic simulations are carried out on MATLAB/Simulink platform. The simulation results show that the doubly-fed induction machine has synchronous reactive power regulation characteristics, proving correctness and effectiveness of the proposed reactive power regulation characteristics.

关 键 词：双馈式可变速抽水蓄能 相量模式 V形曲线 无功特性 

分 类 号：TM721[电气工程—电力系统及自动化]