独立微网下频率和电压自恢复的二次调节及功率分配控制方法  

A Secondary Control Strategy for Frequency and Voltage Recovery and Power Sharing Control Method in Island Microgrid

作　　者：马俊杰 李永刚[1] 李建文[1] 李广地 贺鹏康 MA Junjie;LI Yonggang;LI Jianwen;LI Guangdi;HE Pengkang(College of Electrical and Electronic Engineering,North China Electric Power University,Baoding 071003,Hebei Province,China;College of Information Science and Engineering,Northeastern University,Shenyang 110819,Liaoning Province,China)

机构地区：[1]华北电力大学电气与电子工程学院,河北省保定市071003 [2]东北大学信息科学与工程学院,辽宁省沈阳市110819

出　　处：《现代电力》2022年第3期363-370,共8页Modern Electric Power

基　　金：中央高校基本科研业务费专项资金资助(2020MS095)。

摘　　要：传统的虚拟同步机控制策略在独立微网运行情况下系统出现大容量负载投切时,系统频率和电压会偏离额定值,严重时将会发生频率和电压越限,影响系统的安全运行。为解决这个问题,首先基于虚拟同步机控制策略提出一种在独立微网下频率和电压二次自恢复调节控制方法,实现变流器的频率和电压自治恢复调节。其次,针对变流器线路阻抗参数不一致,导致变流器输出有功功率和无功功率分配不均的问题,分析产生此现象的原因,提出功率均分控制策略,实现功率的分配控制。最后,采用单母线和网状2种结构对提出的控制算法进行验证。算例结果证明该控制策略的有效性和通用性。When large capacity load switching-over takes place in the islanded microgrid,in which the traditional control strategy for virtual synchronous generator is being utilized,the voltage and frequency of the microgrid might deviate rated values,and in severe case the out-of-limit of frequency and voltage may occur,thus the secure operation of microgrid will be affected.To solve this problem,firstly,based on virtual synchronous generator control strategy a secondary self-recovery regulation and control method for voltage and frequency under the environment of islanded microgrid was proposed to implement autonomous recovery and regulation of converter’s frequency and voltage.Secondly,in allusion to the fact that the inconsistency of converter line impedance parameters led to uneven distribution of active and reactive power output from converters,the reason of this phenomenon was analyzed,and a control strategy for the uniform distribution of active and reactive power was put forward to realize the distribution control of active and reactive power.Finally,two structures,i.e.,single busbar structure and meshy structure,were utilized to verify the proposed control algorithm,and both effectiveness and universality of the proposed control strategy were proved.

关 键 词：碳中和 虚拟同步机控制 二次调频 二次调压 功率分配控制 

分 类 号：TM73[电气工程—电力系统及自动化]