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1、基于自适应下垂法的有功功率均分控制*翟盼盼,苟军年,杨剑锋(兰州交通大学自动化与电气工程学院,兰州730070)摘要:在低压孤岛微网中,受到线路阻抗不一致的影响,线路阻抗与并联逆变器的容量不匹配,传统下垂控制方法不能使并联逆变器有功功率达到均分的效果;并且传统下垂控制法反馈信号很难准确的测到线路阻抗后公共节点的电压。针对以上问题,提出了一种自适应的下垂控制方法,该方法具有可变的下垂系数和可变的空载电压,自动调节下垂系数和空载电压来减小并联逆变器有功功率分配的偏差和降低线路阻抗上的电压降。在负荷发生突变和扰动的情况
2、下,利用MALATB2014a/SIMULINK软件平台分别对传统下垂控制和自适应下垂控制进行仿真实验验证,仿真结果验证了自适应下垂控制方法不仅可以使并联逆变器有功功率分配达到均分,还可以大大改善线路阻抗上的电压降。关键词:低压微电网;并联逆变器;下垂控制;功率均分中图分类号:TM74文献标识码:A文章编号:1001-1390(2018)00-0000-00ActivepowersharingcontrolbasedonadaptivedroopmethodZhaiPanpan,GouJunnian,YangJi
3、anfeng(SchoolofAutomation&ElectricalEngineering,LanzhouJiaoTongUniversity,LanzhouUniversity,Lanzhou730070,China,China)Abstract:Inthelow-voltageislandmicro-grid,thelineimpedanceisnotmatchedwiththecapacityoftheparallelinverterduetotheinconsistentlineimpedance.T
4、hetraditionaldroopcontrolmethodcannotcannotachievemaketheeffectoftheparallelinverteractivepowertoachieveequalization;andthetraditionaldroopcontrolmethodfeedbackItitisdifficultforthetraditionaldroopcontrolmethodfeedbacksignaltoaccuratelymeasurethevoltageofthec
5、ommonnodeafterthelineimpedance.Aimingattheaboveproblems,anadaptivedroopcontrolmethodisproposedinthispaper.Themethodhasvariabledroopcoefficientandvariableno-loadvoltage,andautomaticallyadjuststhedroopcoefficientandtheno-loadvoltagetoreducetheactivepowerdistrib
6、utionoftheparallelinverter,aswellasreducethevoltagedropacrossthelineimpedance.InthecaseofloadmutationandDeviationandreducethevoltagedropacrossthelineimpedance.Inthecaseofsuddenloaddisturbanceanddisturbance,thedisturbance,theMATLAB2014a/SIMULINKsoftwareplatfor
7、misusedtoverifythetraditionaldroopcontrolandadaptivedroopcontrol.Thesimulationresultsverifythattheadaptivedroopcontrolmethodcannotonlymakeachievethepowerequalizationoftheparallelinverteractivepowerdistribution,butalso.Achievingequalizationcanalsogreatlyimprov
8、ethevoltagedropacrossthelineimpedance.Keywords:lowvoltagemicro-grid,parallelinverter,droopcontrol,powerequalizationsharing0引言随着大量分布式电源(DG)的接入,微电网的规模也越来越大[1]。随着电力电子设备的进步,这些可再生能源变得更加可靠*基金项目