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1、第4O卷第10期電力系統(tǒng)保護(hù)與控制Vo1.40No.102012年5月16日PowerSystemProtectionandControlMay16,2012多機(jī)系統(tǒng)參數(shù)辨識(shí)的觀測變量選取郭磊,孫建華,鞠平,趙浚婧(1.河海大學(xué)可再生能源發(fā)電技術(shù)教育部工程研究中心,江蘇南京2100982.河南省電力公司調(diào)度通信中心,河南鄭州450052)摘要:針對(duì)發(fā)電機(jī)參數(shù)辨識(shí),采用五種不同的觀測變量進(jìn)行對(duì)比研究,即發(fā)電機(jī)相對(duì)功角、發(fā)電機(jī)端口電壓相對(duì)相角、聯(lián)絡(luò)線有功功率、聯(lián)絡(luò)線無功功率以及樞紐母線電壓。首先對(duì)比研究了靈敏度的相位即是否同時(shí)過零點(diǎn),結(jié)果表明有可能
2、相同參數(shù)對(duì)于某個(gè)觀測變量的靈敏度同時(shí)過零點(diǎn),而對(duì)于另一個(gè)觀測變量卻不同時(shí)過零點(diǎn)。其次對(duì)比研究了靈敏度的大小,結(jié)果表明靈敏度大小依次為發(fā)電機(jī)相對(duì)功角、發(fā)電機(jī)端1:2電壓相對(duì)相角、聯(lián)絡(luò)線有功功率、聯(lián)絡(luò)線無功功率以及樞紐母線電壓。然后對(duì)比研究了參數(shù)的辨識(shí)精度,結(jié)果表明以發(fā)電機(jī)相對(duì)功角作為觀測變量得到的辨識(shí)精度最高。因此,應(yīng)該選擇靈敏度相位不同、幅值較大的變量作為觀測變量。關(guān)鍵詞:電力系統(tǒng);同步發(fā)電機(jī);參數(shù)辨識(shí);軌跡靈敏度;觀測變量Observedvariablesselectionforparameteridentificationofmulti·g
3、eneratorsinpowersystemsGUOLei,SUNJian.hua,JUPing,ZHAOJunking(1.ResearchCenterforRenewableEnergyGenerationEngineeringofMinistryofEducation,HohaiUniversity,Nanjing210098,China;2.DispatchingandCommunicationCenter,ElectricPowerofHenanProvince,Zhengzhou450052,China)Abstract:Thisp
4、apercomparesfiveobservedvariablesfortheparameteridentifcationofgenerators,i.e.therelativerotoranglebetweenthegenerators,therelativephaseangleofgeneratorportvoltage,theactivepowersthroughthetie-lines,thereactivepowersthroughthetie—linesandthevoltagesatthekeybuses.Thecomparati
5、veresultsoftrajectorysensitivityphaseshowthatthegeneratorparametersmaybeidentifiablewithanobservedvariablebutunidentifiablewithanothervariable.Thecomparativeresultsoftrajectorysensitivitymagnitudeindicatethattherelativerotoranglebehaviorsthelargestsensitivity,andthentherelat
6、ivephaseangleofgeneratorportvoltage,theactivepowersthroughthetie—lines,thereactivepowersthroughthetie—linesandthevoltagesatthekeybusessequentially.Thecomparativeresultsofparameterestimationprecisionshowthatthebestoneistherelativerotorangle.Therefore,thevariableswithnoin—phas
7、eandlargesensitivitycouldbeselected.ThisworkissupportedbyNationalNaturalScienceFoundationofChina(No.51137002).Keywords:electricpowersystems;synchronousgenerators;parameteridentification;trajectorysensitivity;observedvariables中圖分類號(hào):TM31文獻(xiàn)標(biāo)識(shí)碼:A文章編號(hào):1674—3415(2012)10.0024—06文獻(xiàn)[
8、5]提出并證明了根據(jù)靈敏度的相位來判0引言斷參數(shù)可辨識(shí)的思路。但采用不同的觀測變量,同發(fā)電機(jī)對(duì)于電力系統(tǒng)具有重要影響,所以有關(guān)一參數(shù)的靈敏度相位有可能