本文選題：模塊化多電平換流器（MMC） + 啟停控制�。� 參考：《華南理工大學(xué)》2014年碩士論文

【摘要】：德國西門子公司采用模塊化多電平換流器的海灣柔性直流輸電工程（Trans BayCable Project）已于2010年正式投運，各國也相繼擬建成MMC-HVDC工程，對MMC-HVDC的研究具有重要的實際應(yīng)用價值。合適的換流站啟動控制策略對緩解MMC-HVDC系統(tǒng)啟動過程中對自身和交流電網(wǎng)的沖擊影響非常重要，若只采用穩(wěn)態(tài)運行時的控制策略而不采取其他輔助措施，將會產(chǎn)生嚴(yán)重的過電壓和過電流現(xiàn)象，甚至導(dǎo)致系統(tǒng)振蕩，影響交流系統(tǒng)正常運行，危及設(shè)備安全，因此對該過程進行研究具有重要意義。 為確保橋臂子模塊電容電壓穩(wěn)定，避免MMC換流器因為少量子模塊發(fā)生故障而停機檢修，本文給出了三種可行的冗余保護方案，并通過Matlab/Simulink仿真分析，選擇了適合MMC的最佳冗余保護方案。 根據(jù)換流站兩端所連接電網(wǎng)的不同形式，將換流站的啟動方法分為有源方式和無源方式。對于有源啟動方式，提出一種解鎖方案用于減小對端換流站解鎖時對直流和交流電網(wǎng)的電流沖擊影響。對于無源啟動方式，在逆變站空載啟動并網(wǎng)前，提出一種逆變側(cè)直接電壓控制器，并且針對由于逆變站子模塊充電不足導(dǎo)致可控解鎖逆變站時產(chǎn)生過大的電流沖擊這一問題，，提出了逆變站的兩種輔助充電策略。另外，針對無源啟動時逆變站側(cè)電網(wǎng)接入形式的不同，提出了并網(wǎng)后切換逆變側(cè)控制策略的方案，并驗證了上述所提策略的正確性和有效性。 最后，將整個停機過程分為能量反饋階段和電阻能耗階段。同時，為使逆變站子模塊能最大限度地將能量反饋回電網(wǎng)，在換流站向無源網(wǎng)絡(luò)供電時，提出逆變側(cè)換流站采取改變每相投入模塊數(shù)的低壓放電解鎖策略。另外，在能耗階段，采用一定的輔助觸發(fā)策略使各子模塊剩余能量以電阻發(fā)熱的形式逐步耗散掉，并仿真驗證了整個停機過程的有效性。
[Abstract]:Trans BayCable Project, a Gulf flexible direct current transmission project with modular multilevel converters, has been formally put into operation in 2010, and many countries are planning to build MMC-HVDC project one after another, which has important practical application value for the study of MMC-HVDC. The appropriate startup control strategy of converter station is very important to mitigate the impact of MMC-HVDC system startup on itself and AC power grid. If only the control strategy of steady operation is adopted and no other auxiliary measures are taken. It will cause serious overvoltage and overcurrent phenomenon, even lead to system oscillation, affect the normal operation of AC system, endanger the safety of equipment, so it is of great significance to study this process. In order to ensure the capacitance voltage stability of the submodule of the bridge arm, and to avoid the MMC converter from stopping and overhauling because of the failure of a few sub-modules, three feasible redundant protection schemes are presented in this paper, and analyzed by Matlab/Simulink simulation. The optimal redundancy protection scheme suitable for MMC is selected. According to the different forms of power grid connected at both ends of converter station, the starting method of converter station is divided into active mode and passive mode. For active start-up, an unlocking scheme is proposed to reduce the impact of current impact on DC and AC power grids when the terminal converter station is unlocked. For passive startup mode, a direct voltage controller of inverter side is proposed before the inverter station starts up and connected to the grid without load. The problem of excessive current impact caused by insufficient charging of the submodule of the inverter station leading to the controllable unlocking of the inverter station is pointed out. Two auxiliary charging strategies for inverter station are proposed. In addition, the scheme of switching inverter side control strategy after grid connection is put forward, and the correctness and effectiveness of the above strategy are verified in view of the different access forms of inverter station side power network during passive start-up. Finally, the whole shutdown process is divided into energy feedback stage and resistance energy consumption stage. At the same time, in order to maximize the energy feedback of the inverter station submodule, when the converter station supplies power to the passive network, the inverter side converter station adopts a low-voltage discharge unlocking strategy to change the number of input modules per phase. In addition, in the energy consumption stage, the residual energy of each sub-module is dissipated gradually in the form of resistance heating by a certain auxiliary trigger strategy, and the effectiveness of the whole shutdown process is verified by simulation.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM721.1

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