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1、畢業(yè)設計說明書基于遺傳算法的配電網(wǎng)無功補償優(yōu)化學生姓名:班級學號:院、系、部:專業(yè):指導教師:合作指導教師:UndergraduateThesisReactivePowerOptimizationofDistributionNetworkBasedongeneticalgorithm摘要配電網(wǎng)進行合理的無功補償,能夠有效地維持系統(tǒng)的電壓水平,降低有功網(wǎng)損,提高網(wǎng)絡輸送容量,節(jié)約發(fā)電成本。而且由于我國配電網(wǎng)長期以來無功匱乏,尤其造成的網(wǎng)損較大,因此無功功率補償是投資少回報高的方案。目前無功補償算法非常多,有傳統(tǒng)的數(shù)學規(guī)劃法,如線性規(guī)劃法、非線性規(guī)劃法、混
2、合整法、動態(tài)規(guī)劃法等及圍繞這些算法的一些改進,也有近幾年剛興起的人工智能方法,如遺傳算法,模擬退火法,模糊集合理論、功率矩法、粒子群優(yōu)化算法等,其中遺傳算法可以通過多路徑進行全局搜索,以避免收斂于局部最優(yōu)點。本文用遺傳算法解決配電網(wǎng)無功補償優(yōu)化問題,將年運行費用最小為目標函數(shù),無功補償源節(jié)點注入無功為控制變量,以節(jié)點電壓為狀態(tài)變量,建立無功優(yōu)化模型,在各種負荷下找出電容的補償位置和容量。關鍵詞配電網(wǎng)系統(tǒng),遺傳算法,無功優(yōu)化,無功補償AbstractReasonablereactivepowercompensationmethodsindistribut
3、ionnetworkscankeepthesystem'svoltageprofile,reducetheactivepowerlossesofnetworks,increasethefeedingcapabilitiesofnetworks,andcutdownthegeneratingcost.thescarcityreactiveofdistributionnetworkforalongtimeinourcountry,especiallycausedbynetworklossgreatly.Soreactivepowercompensation
4、istheschemewhichinvestmentlessandreturnhigher.Atpresent,thealgorithmsofreactivepowercompensationhavesomany,suchastraditionalmathematicalprogrammingmethod,linearprogrammingmethod,nonlinearprogrammingmethod,mixedwholemethod,dynamicprogrammingmethodandsomemethodsbasedontheimproveme
5、ntofthesealgorithms.Recentyears,theartificialintelligencemethodsrecentlysprongup,forexample,geneticalgorithm,simulatedannealing,fuzzysettheory,powermoment,particleswarmoptimizationandsoon.GAcansearchtheglobalbymultipathandavoidlocaloptimalresult.Inthispaper,amethodofGAtosolveopt
6、imalreactivepowercompensationofdistributionnetwork.Themathematicmodelsforreactivepoweroptimization,inwhichannualoperationexpensesistakenastheobjectivefunction,thenodereactivepowerinjectionofreactivepowercompensationistakenasthecontrolvariable,nodevoltageisusedasstatevariable.Byt
7、hismathematicmodels,thepositionofcompensatingcapacitorandprinciplesofcompensatingcapacitorwerefundatvariousload.Keywordsdistributionnetworksystem,geneticalgorithm,reactivepoweroptimization,ReactivePowerCompensation1緒論1.1配電網(wǎng)的基本概念與分類配電網(wǎng)絡主要供給一個地區(qū)的用電,因而又稱地方電力網(wǎng)。相對于區(qū)域電力網(wǎng)來說,它的電壓等級和供電范圍
8、均要小一些,但它在結構上最大的特點是作為電力網(wǎng)的末端而直接和用戶相連,敏銳地反映著用戶在安全、