基于软件锁相环的动态电压恢复器补偿策略实现

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1、基于序分解的分布式发电并网PCC电压幅相检测方法亢梦婕，徐晔，王金全，严舉（解放军理工大学国防工程学院江苏南京，210016）AMagnitude-phaseDetectionMethodforGrid-connectedPCCofDistributedGenerationSystemsBasedonSequenceDecouplingKANGMeng-jie,XUYe,WANGJinquan,YANjun(CollegeofDefenseEngineerin,PLAUniversityofScienceandTechnology,Nanjing210016,China)ABSTRACT:I

2、tisaprcconditionofridingthroughthegridfaultsfordistributedgenerationsystemsthatthemagnitude/phaseinformalionofvoltagesorcurrentsatthegrid-connectedpointofcommoncoupling(PCC)mustbeacquiredprecisely,sothatthecontrolsubsystemofthedistributionsystemscouldtacklethefaults・However,theconventionalthree-pha

3、sesoftwarephasc-lockcdloop,whichadoptedPIcontrolmethodandiswidelyusedforthemagnitude-phasedetection,hadalowspeedofdynamicresponseaffectedbynegative-sequenceandharmoniccomponents,sothatitcouldnotexactlyacquirethefundamcntalpositivc-scqucnccmagnitudc/phascofathree-phasepowersystem.Thispaperproposesan

4、ovelthree-phasemagnitude-phasedetectionmethodbasedondoubledqsynchronousreferenceframe・Theproposedmethodcandecouplethepositivedqandnegativedqsequencesanddetectthemagnitudcs/phascsoffundamentalpositivc-scqucncccomponentandnegative-sequencecomponentofthree-phasevoltagesorcurrents・Thesimulationresultsv

5、erifythattheproposedmethodovercomestheshortcomingofconventionalthree-phasephase-lockedloopandtracksaccuratelythemagnitudesandphasesofthefundamentalpositive-sequencevoltageunderbadharmoniccondition・Theproposedmethodcansuppressoddharmonicpropagationandhasahigherdetectingprecision.Thus,itcanbewidelyus

6、edinthedistributedgeneration・KEYWORDS:distributedgeneration;magnitude-phasedetection;synchronousreferenceframe;dqtransformation;three-phaseunbalance;softwarephaselockedloop(SPLL);摘要：传统的三相软件锁相坏路采用PI控制方式，受三相电网负序分量和谐波分量的影响，动态响应速度慢，无法准确提取三相基波止序分量的幅值和相位信息。提出一种新型三相幅相检测方法，该方法基于双dq同步参考坐标系，实现了基波正序、负序解耦。电网电压

7、或电流的基波正序分量和负序分量分离后，三相电压或电流的基波正序分量及基波负序分量的幅值和相位可以分別被检测出来。仿真结果表明，在电网严重谐波畸变条件下，本文提出的新型三相幅相幅相检测方法克服了传统三相软件锁相环路屮存在的问题，能准确地跟踪基波正序电压的幅值和相位，并能够有效抑制奇次谐波，测量精度高，可广泛应用于分布式发电。关键词：分布式发电；幅相检测；同步参考坐标系；呦变换；三相不平衡；软件锁相环0引言分布式