本文選題：模塊化多電平變換器 + MMC-STATCOM��； 參考：《南京航空航天大學》2014年碩士論文

【摘要】：模塊化多電平變換器（MMC）作為一種新型的、適用于中、高壓功率領域的變換技術，由于其具有的公共直流母線，可以實現(xiàn)四象限運行，同時具有良好的可擴展性與故障冗余性，是電能質量治理如無功補償（STATCOM）、諧波抑制的有效手段。本文以MMC型STATCOM為研究對象，在多電平電路拓撲結構衍變分析的基礎上，采用理論仿真與實驗驗證相結合的研究方法，重點對MMC-STATCOM自適應綜合控制策略進行研究，主要研究內容為： 本文深入分析了MMC變換器四象限運行基本工作原理，在僅考慮電壓電流基波分量的情況下，給出了MMC變換器交流側工作特性矢量關系圖，并在此基礎上，通過對容性無功補償狀態(tài)下的MMC子模塊電容電壓直流分量與交流諧波特性分析，提出了以抑制50Hz脈動為目標的直流側電容選取方法，并兼顧MMC-STATCOM動態(tài)跟蹤性能、電流脈動以及輸出電流能力等設計指標，選取并設計了合適的橋臂串聯(lián)電感。 本文提出了MMC-STATCOM自適應綜合控制策略，主控制器采用直接電流型反饋解耦控制策略，在恒頻啟動過程和穩(wěn)態(tài)工作階段自適應選擇合適的電容電壓平衡控制策略，實現(xiàn)了有功電流isd與無功電流isq的獨立控制，而且在裝置啟動階段子模塊電容電壓能夠快速響應控制指令，穩(wěn)態(tài)工作階段輸出電流諧波特性高，子模塊電容電壓平衡性能優(yōu)異。 針對MMC-STATCOM恒頻啟動控制，對NLM排序均壓算法進行優(yōu)化，使其在變換器恒頻啟動過程及穩(wěn)態(tài)工作階段均適用，所提出的直流斜坡電壓優(yōu)化控制策略，在未設置預充電電阻的情況下，有效減小了MMC解鎖瞬間的沖擊電流，從而簡化了裝置啟動電路。 本文深入研究了穩(wěn)態(tài)工作階段MMC-STATCOM電容電壓平衡方法，建立了子模塊穩(wěn)態(tài)平均數(shù)學模型，通過數(shù)學推導，，獲得了子模塊電容電壓的解析表達式，從中揭示了導致子模塊電容電壓不平衡的原因，仿真結果也進一步驗證了子模塊數(shù)學模型的正確性。 本文搭建了±3kVar三相MMC-STATCOM實驗平臺。實驗結果與理論分析以及仿真結果相一致，均驗證了自適應綜合控制策略的可行性與有效性。
[Abstract]:As a new type of conversion technology, modularized multilevel converter (MMC) is suitable for medium and high voltage power field. Because of its common DC bus, it can realize four-quadrant operation, at the same time, it has good expansibility and fault redundancy.It is an effective means of harmonic suppression for power quality control such as reactive power compensation.This paper takes MMC type STATCOM as the research object, based on the topology evolution analysis of multilevel circuit, adopts the research method of combining the theory simulation with the experiment verification, emphatically carries on the research to the MMC-STATCOM adaptive synthesis control strategy, the main research content is as follows:In this paper, the basic operating principle of MMC converter in four quadrants is deeply analyzed, and the vector relation diagram of AC side operation characteristic of MMC converter is given under the condition of considering only the fundamental component of voltage and current.By analyzing the DC component of capacitive voltage and AC harmonics of MMC submodule under capacitive reactive power compensation condition, a method of selecting DC side capacitance aiming at suppressing 50Hz pulsation is proposed, and the dynamic tracking performance of MMC-STATCOM is taken into account.The current pulsation and output current capacity are selected and designed.In this paper, an adaptive integrated control strategy for MMC-STATCOM is proposed. The main controller adopts direct current-mode feedback decoupling control strategy and adaptively selects the appropriate capacitive voltage balance control strategy in the constant frequency start-up process and steady operation phase.The independent control of active current isd and reactive current isq is realized, and the capacitive voltage of the submodule can respond to the control instruction quickly in the start-up stage of the device. The output current harmonic characteristic is high during the steady state operation, and the capacitor voltage balance performance of the sub-module is excellent.Aiming at the MMC-STATCOM constant frequency startup control, the NLM sorting voltage equalization algorithm is optimized, which is suitable for both the constant frequency start-up process and the steady state operation stage of the converter. The proposed DC slope voltage optimal control strategy is proposed without setting the precharge resistor.The impulse current of MMC unlocking is reduced effectively, thus simplifying the starting circuit of the device.In this paper, the method of MMC-STATCOM capacitor voltage balance in steady working phase is deeply studied, and the mathematical model of steady state average of submodule is established. Through mathematical derivation, the analytical expression of capacitance voltage of submodule is obtained.The reason of the unbalance of capacitance voltage of submodule is revealed, and the correctness of mathematical model of submodule is further verified by simulation results.In this paper, a 鹵3kVar three-phase MMC-STATCOM experimental platform is built.The experimental results are consistent with the theoretical analysis and simulation results, which verify the feasibility and effectiveness of the adaptive integrated control strategy.
【學位授予單位】：南京航空航天大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM46

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