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时间:2020-03-28
《强跟踪UKF算法在光伏系统MPPT中的应用.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18期电力系统保护与控制Vo1.41NO.182013年9月16日PowerSystemProtectionandControlSep.16,2013强跟踪UKF算法在光伏系统MPPT中的应用聂晓华(南昌大学信工学院,江西南昌330031)摘要:强跟踪UKF算法是采用Unscented策略逼近非线性分布且强跟踪系统突变的状态估计算法,该算法兼具强跟踪算法鲁棒}生强、Unscented变换精度高、实现简单的优点。针对光伏系统在部分遮蔽情况下最大功率点误判问题,结合恒压法与强跟踪UKF算法,提出了一种新的光伏系统MPPT策略。采用恒压法快速定位最大功率点的
2、电压范围;在该电压范围用尽量小步长的控制电压,以相应瞬时功率作为被估量,采用STUKF算法精确估算最大功率点,确定相应控制电压;保证光伏系统MPPT跟踪速度基础上,提高跟踪精度,通过状态跟踪判断状态突变,避免了误判问题。仿真和实验验证了所提策略的正确性、有效性。关键词:光伏系统;最大功率点跟踪;恒压法;强跟踪UnscentedKalman滤波ApplicationofthestrongtrackingUnscentedKalmanfilteralgorithminphotovoltaicsystemmaximumpowerpointtrackingNIEXiao
3、.hua(SchoolofInformationEngineering,NanchangUniversity,Nanchang330031,China)Abstract:StrongtrackingUnscentedKalmanfilteralgorithmisallestimationmethodofapproximatingnonlineardistributionbytheUnscentedstrategyandtrackingstronglysystemstatusmutation.Thealgorithmcombinestheadvantageofst
4、rongtrackingalgorithmrobustness,highaccuracyofUnscentedtransformandsimplerealization.Inallusiontothephotovoltaicsystemmaximumpowerpointmisjudgmentproblemunderpartiallyshadedconditions,anewMPPTcontrolstrategyisproposedbycombiningfixedvoltagemethodwiths~ongtrackingUnscentedKalmanfilter
5、(STUKF)algorithm.Thevoltagerangeofthemaximumpowerpointisdeterminedbythefixedvoltagemethod.Inthisvoltagerange,thesmall-stepcontrolvoltageisadopted,theinstantaneouspoweristakenastheestimativevalue,thepowermaximumpowerpointisaccuratelyestimatedbythestrongtrackingUnscentedKalmanfiler,and
6、itscorrespondingcontrolvoltageisobtained.TheMPPTtrackingaccuracyisimprovedonthebasisofassuringtheMPPTtrackingspeed.Themutationstatusofpowerisdetectedbytrackingthestate,andtheMPPTmisjudgmentproblemisavoided.Thecorrectnessandefectivenessofthestrategyisverifiedbysimulationandexperiment.
7、Keywords:photovoltaicsystem;maximumpowerpointtracking;fixedvoltagemethod;strongtrackingUnscentedKalmanfilter中图分类号:TM76;TM615文献标识码:A文章编号:1674—3415(2013)18—0089—07法,总结阵列结构优化的原则,并在此基础上进一O引言步考虑局部峰值及工作电压范围等因素的影响,提光伏电池输出功率受外界温度、光照强度和负出适用性较广的光伏阵列优化设计方法。文献[6]载影响,具有特殊的时变非线性【lJ,为此在传统MPPT结合电路的串
8、并联理论,对局部阴影条件
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