统一潮流控制器并联变换器虚拟惯量控制策略  

Virtual Inertia Control Strategy of Unified Power Flow Controller Parallel Converter

作　　者：张海同 王金梅 袁小威 何铭 鲍振铎 ZHANG Hai-tong;WANG Jin-mei;YUAN Xiao-wei;HE Ming;BAO Zhen-duo(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：《科学技术与工程》2021年第30期12959-12965,共7页Science Technology and Engineering

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

摘　　要：针对统一潮流控制器(unified power flow controller,UPFC)在调节电力系统线路潮流过程中存在的功率不平衡引起的UPFC接入点电压、直流电容电压波动问题,构建UPFC的数学模型,设计稳压控制电流前馈,提出基于虚拟惯量的UPFC并联变换器控制策略,通过引入UPFC电容虚拟惯量,在并联变换器电压外环的基础上设计UPFC电容虚拟惯量控制环,以电网实际频率为输入量,降低潮流控制过程中的电压波动;为加快UPFC直流侧电容电压控制速度,将前馈补偿点进行了改进,在并联变换器dq轴有功无功分量控制环路中加入改进的前馈量,改善功率协调控制效果。搭建UPFC仿真模型,仿真结果表明,相比常规控制策略,该控制策略既保证了线路有功无功独立调节的功能,又有效地减少了电压的波动,提高了系统的响应速度。In line power flow regulation,in order to solve the problem that unified power flow controller(UPFC)bus point voltage and direct current capacitor voltage fluctuation,by setting up UPFC mathematical model,and voltage stabilizing control system current feedforward of shunt converter were designed,the control strategy of UPFC parallel converter based on virtual inertia was proposed,by introducing the virtual inertia of UPFC capacitor,and the virtual inertia control loop of UPFC capacitor was designed based on the voltage outer loop of parallel converter,to take the actual frequency of power grid as input,for the sake of reducing the voltage fluctuation in the process of power flow control.In order to speed up the control speed of capacitor voltage on the DC side of UPFC,the feedforward compensation point was improved,and the improved feedforward quantity was added to the active and reactive component control loop of dq axis of parallel converter to improve the power coordination control effect.The UPFC simulation model was built,and the simulation results show that it compared with the conventional control strategy,this control strategy not only ensures the independent regulation of active and reactive power of the line,but also effectively reduces the voltage fluctuation and improves the response speed of the system.

关 键 词：统一潮流控制器 潮流调节 虚拟惯量 电压波动 电流前馈 协调控制 

分 类 号：TM712[电气工程—电力系统及自动化]