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时间:2020-03-28
《基于降阶谐振调节器的正负序分量检测方法.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第41卷第14期电力系统保护与控制V01.41NO.142013年7月16日PowerSystemProtectionandControlJuly16,2013基于降阶谐振调节器的正负序分量检测方法李葛亮,谢桦,赵新,沈沉(1.北京交通大学电气工程学院,北京100044;2.清华大学电机系电力系统国家重点实验室,北京100084)摘要:在电网不平衡下并网逆变器的控制策略中需对电网电压进行正负序分量准确检测,还需要对电流的正负序分量进行控制。研究了一种谐振调节器,该调节器是由传统的二阶谐振(S06I)调节器降阶得到
2、,称之为降阶谐振(R0R)调节器,理论分析表明,其能在特定频率下对交流量的正序或负序分量实现独立的无静差调节。将其应用在电网电压和电流的正负序检测中,提出一种新的电网电压和电流正负序检测方法,该方法加入了调节器的积分系数,角频率由锁相环反馈得到,实现自适应调节。仿真和实验验证了所提方法动态响应快,能在静止坐标系下分别对电网基波正负序分量实现无差跟踪,并具有一定的抗谐波干扰能力。关键词:电网不平衡;并网逆变器;正负序分量;降阶谐振调节器;二阶广义积分器Positive--andnegative--sequencec
3、omponentdetectingmethodbasedonreducedorderresonantregulatorLIGe.1iang,XIEHua,ZHAOXin,SHENChen。(1.SchoolofElectricalEngineering,BeijingJiaotongUniversity,Beijing100044,China;2.StateKeyLabofPowerSystems,DeptofElectricalEngineering,TsinghuaUniversity,Beijing1000
4、84,China)Abstract:Gridconnectedinverter’Scontrolstrategyneedstodetectthepositive—andnegative—sequencecomponentofvoltagesandcurrentsunderunbalancedvoltageconditioninthepowersystem.Thispaperstudiesakindofresonantcontrollercalledthereducedorderresonance(ROR)regu
5、lator,whichisreducedfromthetraditionalsecondordergeneralizedintegrator(SOGI).Theregulatorisabletoachievefloatingcontrolofaltematingvoltage’Spositive—ornegative-componentindependentlyatagivenfrequency.Anewpositive—andnegative—sequencecomponentdetectingmethodis
6、proposed.Integralfactorisaddedintheregulatorandtheangularfrequencyisobtainedbyphaselockedloop’Sfeedback.Simulationandexperimentresultsshowtheproposedmethodcanachievezeroerortrackingofgridvoltage’Spositive—andnegative—componentinstationaryreferenceframequickly
7、,andhasfastdynamicresponseandacertaindegreeofharmonicsuppressionability.ThisworkissupportedbyStateKeyLaboratoryofControlandSimulationofPowerSystemandGenerationEquipmentofTsinghuaUniversityKeywords:unbalancedvoltagecondition;gridconnectedinverter;positive—andn
8、egative—component;reducedorderresonanceregulator;secondordergeneralizedintegrator中图分类号:TM464文献标识码:A文章编号:1674—3415(2013)14·0041-07条件下的逆变器控制策略中,需要对电网电压和并0引言网电流进行正负序分量检测,实现对正负序分量的电压源型PWM逆变器广
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