UPFC并联变换器协调控制策略研究  

Research on coordinated control strategy for shunt converter of UPFC

作　　者：张海同 王金梅 袁小威 何铭 鲍振铎 Zhang Haitong;Wang Jinmei;Yuan Xiaowei;He Ming;Bao Zhenduo(School of Physics and Electrical Engineering,Ningxia University,Yinchuan 750021,China)

机构地区：[1]宁夏大学物理与电子电气工程学院,银川750021

出　　处：《电子测量技术》2021年第21期25-30,共6页Electronic Measurement Technology

基　　金：宁夏自然科学基金(2019AAC03027);宁夏回族自治区重点研发计划项目(2020BDE03003);宁夏回族自治区重点研发计划项目(2018BFH03004)资助。

摘　　要：针对统一潮流控制器(UPFC)在调节电力线路潮流过程中存在的功率不平衡引起的UPFC接入点电压和直流电容电压波动问题,通过构建UPFC的数学模型,设计并联变换器电流解耦控制器,根据功率平衡原理推导出稳压控制的电流前馈补偿量,提出改进的并联变换器协调控制策略,将得到的前馈补偿量引入到并联变换器有功和无功控制系统中,为实现单位前馈采用移动前馈补偿点和增加前馈补偿函数方法,来改善补偿效果。通过MATLAB搭建含有UPFC的500 kV交流输电系统仿真模型,结果表明,相比改进前的协调控制策略,所提控制策略既满足了有功无功潮流相互协调控制要求,又提高了输电系统对电压的支撑能力(接入点电压和直流电容电压波动已分别降低至6.7 kV、1.1 kV),系统对直流电容的输出响应时间也缩短了0.5 s。In line power flow regulation,in order to solve the problem that UPFC bus point voltage and DC capacitor voltage fluctuation,by setting up UPFC mathematical model,current decoupling controller of parallel converter are designed,according to the principle of power balance,the current feedforward compensation of voltage stabilization control is derived.and an improved coordinated control strategy based on shunt converter is proposed.The obtained feedforward compensation amount is introduced into the active and reactive power control system of the parallel converter,in order to realize unit feedforward,the methods of moving feedforward compensation points and adding feedforward compensation functions are adopted to improve the compensation effect during power flow regulation.MATLAB is used to build a simulation model of 500 kV AC transmission system with UPFC,the results show that compared with the coordinated control strategy before improvement,the proposed control strategy not only meets the requirements of coordinated control of active and reactive power flows,but also improves the voltage supporting capacity of the transmission system(the fluctuation of access point voltage and DC capacitor voltage has been reduced to 6.7 kV and 1.1 kV respectively),the response time of the system to the output of DC capacitor is also shortened by 0.5 s.

关 键 词：统一潮流控制器 潮流调节 解耦控制 电压波动 协调控制 前馈补偿量 

分 类 号：TM46[电气工程—电器]