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  本文選題：多饋入直流　切入點(diǎn)：交直流混聯(lián)系統(tǒng)　出處：《南京理工大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：在具有多饋入直流(multi-infeed direct current,MIDC)格局的交直流混聯(lián)系統(tǒng)中,直流逆變側(cè)發(fā)生短路故障時,一方面會帶來短路電流越限的問題,另一方面,交流系統(tǒng)電壓持續(xù)降低會引起多回直流輸電系統(tǒng)連續(xù)發(fā)生同時換相失敗,嚴(yán)重情況下甚至造成送端電網(wǎng)出現(xiàn)暫態(tài)穩(wěn)定性問題。故障限流器(fault current limiter,FCL)不僅能夠有效地限制短路電流,同時還具有抑制直流換相失敗的效果。因此,本文通過在換流站附近短路故障發(fā)生區(qū)域內(nèi)的不同位置加裝FCL,研究其對直流換相失敗及由此帶來的電力系統(tǒng)暫態(tài)穩(wěn)定性的影響,并利用FCL抑制多回直流換相失敗的特點(diǎn)提出了一種多目標(biāo)優(yōu)化配置方法,具體開展的研究工作如下:1)對直流換相失敗的機(jī)理、影響因素等進(jìn)行了研究和總結(jié),并擴(kuò)展到對多饋入直流輸電系統(tǒng)中換相失敗特點(diǎn)的探索。2)針對多饋入直流輸電系統(tǒng)中存在的換相失敗問題,從機(jī)理上分別解釋了FCL抑制單回直流換相失敗與多回直流同時換相失敗的原因,并利用擴(kuò)展等面積準(zhǔn)則(extended equal area criterion,EEAC)理論,分析了不同功率流向情況下,FCL投入后對多饋入交直流混聯(lián)系統(tǒng)送端暫態(tài)穩(wěn)定性的影響。3)在仿真軟件PSD-BPA中,以國家電網(wǎng)公司規(guī)劃的"三華"交直流電網(wǎng)為研究對象,選取串聯(lián)諧振型故障限流模型進(jìn)行仿真,驗(yàn)證了FCL能夠有效抑制直流換相失敗,并且可以降低具有MIDC的交直流混聯(lián)系統(tǒng)發(fā)生同時換相失敗的風(fēng)險概率;同時也驗(yàn)證了FCL的投入可以緩解多回直流同時換相失敗引起的交流系統(tǒng)功率波動,進(jìn)而能夠提高由于功率不平衡導(dǎo)致機(jī)群間相對運(yùn)動下系統(tǒng)暫態(tài)安全穩(wěn)定裕度。4)綜合考慮FCL成本、限流效果以及對換相失敗的抑制效果等方面,提出了一種兼顧多直流換相失敗抑制的FCL優(yōu)化配置方法。
[Abstract]:In the AC / DC hybrid system with multi-feed multi-feed direct current MIDCC pattern, when the DC inverter side short-circuit fault occurs, on the one hand, the short-circuit current will exceed the limit, on the other hand, the short-circuit current will exceed the limit, on the other hand, The continuous reduction of voltage in AC system will cause continuous commutation failure in multiple HVDC transmission systems, and even cause transient stability problems in the power supply network. Fault current limiter (FCL) can not only effectively limit the short-circuit current, but also cause the transient stability of the power supply network. The effect of FCLs on DC commutation failure and the transient stability of power system is studied by installing FCLs at different locations in the short circuit fault area near the converter station, and the effect of FCLs on the DC commutation failure and the power system transient stability is studied in this paper. A multi-objective optimal configuration method is proposed based on the characteristics of FCL to suppress DC commutation failure. The detailed research work is as follows: 1) the mechanism of DC commutation failure, the influencing factors and so on are studied and summarized. And it is extended to explore the characteristics of commutation failure in multi-fed HVDC transmission system. 2) aiming at the commutation failure problem in multi-fed HVDC transmission system, In this paper, the reason why FCL can suppress single DC commutation failure and multiple DC simultaneous commutation failure is explained in terms of mechanism, and extended equal area criterion is applied to the theory of extended equal area criterion. The influence of different power flow direction on the transient stability of multi-fed AC / DC hybrid system is analyzed. 3) in the simulation software PSD-BPA, the "Sanhua" AC / DC power network, which is planned by State Grid Company, is taken as the research object. The series resonant fault current limiting model is selected for simulation, which verifies that FCL can effectively suppress DC commutation failure and reduce the risk probability of simultaneous commutation failure in AC / DC hybrid system with MIDC. At the same time, it is proved that the input of FCL can mitigate the power fluctuation of AC system caused by the simultaneous commutation failure of multiple DC. Furthermore, it can improve the transient security stability margin. 4) considering the FCL cost, the current limiting effect and the suppression effect of commutation failure, etc. In this paper, an optimal configuration method of FCL is proposed, which takes into account the suppression of multi-DC commutation failure.
【學(xué)位授予單位】：南京理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM721.1

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本文編號：1644643