大型發(fā)電機(jī)組勵(lì)磁故障特性及其保護(hù)的研究.pdf

1、華北電力大學(xué)碩士學(xué)位論文摘要?jiǎng)?lì)磁系統(tǒng)故障是大型同步發(fā)電機(jī)的一種嚴(yán)重故障，它對(duì)發(fā)電機(jī)本身及外部電網(wǎng)的安全都將產(chǎn)生嚴(yán)重影響。對(duì)勵(lì)磁故障特性及其保護(hù)的研究將對(duì)電力系統(tǒng)及發(fā)電機(jī)的穩(wěn)定運(yùn)行具有十分重要的意義。本文利用BPA電力系統(tǒng)仿真程序?qū)ν桨l(fā)電機(jī)失磁故障進(jìn)行仿真計(jì)算分析。采用失磁保護(hù)典型判據(jù)理論分析與數(shù)值仿真計(jì)算相結(jié)合的方法，以此為基礎(chǔ)對(duì)失磁保護(hù)典型判據(jù)的判據(jù)進(jìn)行剖析，找出現(xiàn)行保護(hù)在原理上存在的缺陷，提出防誤動(dòng)措施。同時(shí)，還對(duì)失磁保護(hù)與低勵(lì)限

2、制的整定配合進(jìn)行了研究，提出了校驗(yàn)步驟。對(duì)發(fā)電機(jī)的失磁異步運(yùn)行及再同步的操作運(yùn)行過程進(jìn)行了仿真分析，指出發(fā)電機(jī)失磁后不立即切機(jī)而保持短時(shí)間異步運(yùn)行是可行的，如果能夠短時(shí)間內(nèi)切換勵(lì)磁或排除失磁故障，則可以順利實(shí)現(xiàn)再同步。另外，還對(duì)大型電廠聯(lián)變投退對(duì)系統(tǒng)安全穩(wěn)定性的影響進(jìn)行了總結(jié)。關(guān)鍵詞:勵(lì)磁故障，失磁保護(hù)，安全穩(wěn)定性ABSTRACTLossofexeitationfailure15aseriousgeneratorfailure，whie

3、hWillhaveaseriousimPacttothegeneratorandsystemsafety.TheresearehofexeitationfaulteharaeteristicsandProteetionwillbeneeessaryandhasagreatsignifieance.Inthisthesis，theoreticalanalysismethodeombinedwithnumeriealsimulationea

4、leulation15used.Firstly，basedongeneratorPrineiPleand1055ofexeitationtheoryofgenerator，synclironousgeneratoroPerationbehaviourafterexcitationfault15analyzed，andthedefeetsoftheexistingProtectionPrineiPlesareidentified，with

5、Providingtheanti一maloPerationmeasures.Seeondly，Pointoutthatthe1055ofexeitationgenerator15feasibletomaintainashortPeriodasynehLronousoPeration，ifweeanedueatePowerirnnlediately.Afterexeluding1055offieldfailure，iteansmoothl

6、yresynehLronize.Finally，theimPaetoftheswitehoPerationofeonneetingtransfmerinlarge一sealePowerPlanttothesecurityandstabilityofthesystemaresununarized.ZouYalin(eleetriePowersystemitsautomation)DirectedbyProf.XiaoShiwuKEYWOR

7、DS:1055ofexeitationfailure，generatorexcitationProtection，safetyandstability華北電力大學(xué)碩士學(xué)位論文3.4.1(P一Q)平面低勵(lì)限制曲線特性............................……，....................................……273.4.2失磁保護(hù)定子阻抗圓(P一Q)平面變換...................

8、.......................................……283.4.3失磁阻抗保護(hù)與低勵(lì)限制的配合校驗(yàn).......................................................……303.5轉(zhuǎn)子低電壓判據(jù)......................……，.................................................……，..........

9、....……犯3.5卜1判據(jù)的原理.................................................................................................……，.323.5.2判據(jù)的分析..........................................................................................

10、.........……333.6低電壓出口閉鎖判據(jù)的問題及改進(jìn)的出口動(dòng)作方案....................................……333.7小結(jié)......................................................................................................................……35第四章同步發(fā)電機(jī)失磁異步運(yùn)行及

11、再同步研究..........................................................……374.1引言.........................................……，......................................................................……374.2同步發(fā)電機(jī)失磁異步運(yùn)行及再同步運(yùn)行過程........

12、........................................……374.3同步發(fā)電機(jī)失磁異步運(yùn)行仿真…，.，……，.，，...................……，.....................……，...……384.3.1同步發(fā)電機(jī)失磁異步運(yùn)行的注意事項(xiàng).......................................................……384.3.2同步發(fā)電機(jī)失磁異步運(yùn)行仿

13、真...................................................................……394.4同步發(fā)電機(jī)失磁異步后再同步仿真................................................................……434.4.1失磁同步發(fā)電機(jī)再同步的注意事項(xiàng)..........................................

14、.................……434.4.2失磁同步發(fā)電機(jī)再同步仿真.....……，...........................................................……434.5小結(jié)..........................................................................................................

15、............……46第五章大型電廠聯(lián)變投退對(duì)系統(tǒng)安全穩(wěn)定性的影響..................................................……475.1引言............................................................................................................……、...……475.2安全

16、穩(wěn)定性因素..................................................................................................……475.2.1系統(tǒng)傳輸能力................................................................................................……475.

17、2.2穩(wěn)定性...........................................................................................................……485.2.3短路電流水平............................................................................................

18、....……485.3實(shí)例分析............................................……‘...........................................................……485.3.1電廠母聯(lián)變投退下的潮流分析....................................................................……485.3.2

19、N一1靜態(tài)安全分析.........................................................................................……495.3.3系統(tǒng)暫態(tài)穩(wěn)定性水平................……，...........................……，..…，…，……，.........……505.3.4短路電流水平......................

20、.........................................................................……515.4小結(jié)......................................................................................................................……52第六章結(jié)論...........

21、....................................................……，.........................……，......……，...……53參考文獻(xiàn).....................................................................................................................

22、.……55致謝............................................................................................................................……57在學(xué)期間發(fā)表的學(xué)術(shù)論文和參加科研情況...................................................................