本文選題：電網(wǎng)換相換流器　切入點：電壓源換流器　出處：《華北電力大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：電網(wǎng)換相型高壓直流(Line Commutated Converter High Voltage Direct Current, LCC-HVDC)在我國已經(jīng)廣泛應(yīng)用,具有輸送功率大、輸電距離遠(yuǎn)的特點,但換相失敗問題仍亟待解決。近年來以全控型器件為基礎(chǔ)的電壓源換流器型高壓直流輸電(Voltage Source Converter based High Voltage Direct Current, VSC-HVDC)迅速發(fā)展,具有控制靈活、可以供電無源網(wǎng)絡(luò)等優(yōu)勢。一端為LCC另一端為VSC構(gòu)成的電壓源、電流源混合型直流輸電(Hybrid-HVDC),可以結(jié)合兩種換流器的優(yōu)勢,構(gòu)成一種具有廣泛應(yīng)用前景的新型拓?fù)?具有深入研究的價值。 首先闡述了Hybrid-HVDC的特點與適用領(lǐng)域,分析了其拓?fù)浣Y(jié)構(gòu)和接線方式,分別研究了兩端換流站的參數(shù)設(shè)計和控制方法。然后研究了整流側(cè)和逆變側(cè)分別為LCC和VSC的混合直流輸電結(jié)構(gòu),兩種仿真模型均在PSCAD/EMTDC環(huán)境中進(jìn)行了仿真驗證。對于整流側(cè)為LCC、逆變側(cè)為VSC的混合直流輸電系統(tǒng),設(shè)計了合理的啟動與控制方法,并使用Simplex算法對直流側(cè)LC參數(shù)與控制器PI參數(shù)進(jìn)行了優(yōu)化,得到更好的運(yùn)行特性；并研究了混合直流輸電系統(tǒng)向無源網(wǎng)絡(luò)供電的情況。對于整流側(cè)為VSC、逆變側(cè)為LCC的混合直流輸電系統(tǒng),針對其逆變側(cè)容易發(fā)生換相失敗的情況,對比了不同控制策略的優(yōu)略,并在此基礎(chǔ)上提出了新的抑制換相失敗的協(xié)調(diào)控制方法,在逆變側(cè)包含低壓限流(Voltage Dependent Current Order Limiter, VDCOL)的定直流電流控制的基礎(chǔ)上加入了定關(guān)斷角備用控制,在整流側(cè)定直流電壓的基礎(chǔ)上加入低壓限壓控制(Voltage Dependent Voltage Order Limiter, VDVOL),仿真結(jié)果驗證了協(xié)調(diào)控制方法可以降低換相失敗的概率,并改善了系統(tǒng)的故障恢復(fù)特性。
[Abstract]:The commutation Commutated Converter High Voltage Direct current (LCC-HVDC) has been widely used in China, which has the characteristics of large transmission power and long transmission distance. In recent years, voltage Source Converter based High Voltage Direct current (VSC-HVDC), which is based on full-control devices, has developed rapidly and has flexible control. It can supply the advantages of passive network, one end is a voltage source composed of LCC and the other end is VSC, and the hybrid current source hybrid direct current transmission can combine the advantages of two converters to form a new topology with wide application prospects. It has the value of further study. Firstly, the characteristics and application fields of Hybrid-HVDC are described, and its topology and connection mode are analyzed. The parameter design and control methods of the converter stations are studied respectively. Then the hybrid DC transmission structures with rectifier side and inverter side are studied, which are LCC and VSC respectively. The two simulation models are verified in PSCAD/EMTDC environment. For the hybrid DC transmission system with rectifier side and inverter side as VSC, reasonable start-up and control methods are designed. The LC parameters of DC side and Pi parameters of controller are optimized by Simplex algorithm. For the hybrid DC transmission system with rectifier side and inverter side as LCC, the inverter side is prone to commutative failure, and the advantages and disadvantages of different control strategies are compared. Based on this, a new coordinated control method to suppress commutation failure is proposed. Based on the constant DC current control with low voltage current limiting Dependent Current Order limiter (VDCOL) in the inverter side, a fixed turn-off angle standby control is added. The voltage Dependent Voltage Order limiter (VDVOL) is added to the fixed DC voltage of the rectifier side. The simulation results show that the coordinated control method can reduce the probability of commutation failure and improve the fault recovery characteristics of the system.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM721.1

【參考文獻(xiàn)】

相關(guān)期刊論文 前3條

1 張桂斌,徐政,王廣柱;基于VSC的直流輸電系統(tǒng)的穩(wěn)態(tài)建模及其非線性控制[J];中國電機(jī)工程學(xué)報;2002年01期

2 何朝榮;李興源;;影響多饋入高壓直流換相失敗的耦合導(dǎo)納研究[J];中國電機(jī)工程學(xué)報;2008年07期

3 王姍姍;周孝信;湯廣福;賀之淵;滕樂天;包海龍;;模塊化多電平換流器HVDC直流雙極短路子模塊過電流分析[J];中國電機(jī)工程學(xué)報;2011年01期

相關(guān)博士學(xué)位論文 前2條

1 袁旭峰;新型混合多端直流輸電系統(tǒng)理論及其若干關(guān)鍵問題研究[D];華中科技大學(xué);2007年

2 潘武略;新型直流輸電系統(tǒng)損耗特性及降損措施研究[D];浙江大學(xué);2008年

，

本文編號：1642121