本文選題：靜止同步補償器 + 混合級聯(lián)多電平換流器��； 參考：《浙江大學》2014年碩士論文

【摘要】：靜止同步補償器(Static Synchronous Compensator,STATCOM)作為一種并聯(lián)型無功補償FACTS裝置,因其良好的動態(tài)特性受到廣泛重視。隨著我國輸電容量和負荷的不斷增大,無功補償向著高壓大容量發(fā)展,鏈式STATCOM因具有模塊化、多電平特性,便于擴展和實現(xiàn)冗余,成為無功補償方面的研究和應用熱點。近年來,鏈式主電路拓撲又有了新的發(fā)展,出現(xiàn)了混合級聯(lián)多電平拓撲,為高壓大容量無功補償裝置的研制開辟了一條新思路。本文提出了一種基于混合級聯(lián)多電平換流器(Hybrid Cascaded Multilevel Converter, HCMC)的新型STATCOM,簡稱HCMC-STATCOM,主要研究了HCMC-STATCOM的控制策略、調(diào)制策略、H橋電容電壓平衡控制策略和直流電容參數(shù)設計問題。 本文提出的HCMC-STATCOM由常規(guī)二電平電壓源換流器和H橋子模塊級聯(lián)而成的整形電路兩部分構(gòu)成。在其拓撲結(jié)構(gòu)的基礎上分析了HCMC-STATCOM的基本工作原理,并且建立了交流系統(tǒng)平衡情況下HCMC-STATCOM在三相靜止坐標系和兩相同步旋轉(zhuǎn)坐標系下的數(shù)學模型。 研究了功率前饋解耦控制策略,并設計了控制器實現(xiàn)整形電路和二電平換流器的協(xié)調(diào)配合,以及直流電容電壓的控制；詳細闡述了整形電路兩種調(diào)制策略單極倍頻載波移相SPWM調(diào)制策略(Carrier Phase-Shifting SPWM,CPS-SPWM)和最近電平逼近調(diào)制(Nearest Level Modulation,NLM)的實現(xiàn)方法；詳細分析了HCMC-STATCOM的啟動控制策略；利用PSCAD/EMTDC仿真驗證了所提出控制策略、調(diào)制策略和啟動策略的有效性。 整形電路H橋直流電容電壓的平衡是HCMC-STATCOM正常運行的前提。本文研究了在CPS-SPWM和NLM兩種不同調(diào)制策略下的H橋直流電容電壓平衡控制策略；通過PSCAD/EMTDC仿真對提出的電容電壓平衡控制策略進行了有效性驗證。 直流電容器的參數(shù)直接影響HCMC-STATCOM的整體性能,本文對整形電路H橋直流電容和二電平換流器直流電容進行了理論參數(shù)設計；對HCMC-STATCOM與鏈式STATCOM在H橋數(shù)目、功率器件數(shù)目以及直流電容大小、數(shù)目以及所儲存的能量方面進行了分析比較;總結(jié)了HCMC-STATCOM相對鏈式STATCOM和其他STATCOM的優(yōu)點和缺點;利用PSCAD/EMTDC仿真對上述參數(shù)設計和分析進行了驗證。
[Abstract]:Static synchronous compensator (static synchronous compensator), as a shunt reactive power compensator facts device, has been paid more and more attention for its good dynamic characteristics. With the increasing of transmission capacity and load in our country, reactive power compensation is developing to high voltage and large capacity. Because of its modularization, multilevel characteristic, easy to expand and realize redundancy, it has become the research and application hotspot of reactive power compensation. In recent years, new developments have been made in the topology of chained main circuit, and a hybrid cascade multilevel topology has emerged, which opens a new way of thinking for the development of high-voltage and large-capacity reactive power compensator. In this paper, a novel STATCOM-based hybrid cascade multilevel converter (HCMC-based) is proposed. The control strategy, modulation strategy and voltage balance control strategy of HCMC-STATCOM and the design of DC capacitance parameters are studied. The HCMC-STATCOM proposed in this paper consists of a conventional two-level voltage source converter and an H-bridge sub-module cascaded into two parts of the shaping circuit. Based on the topology of HCMC-STATCOM, the basic working principle of HCMC-STATCOM is analyzed, and the mathematical model of HCMC-STATCOM in three-phase stationary coordinate system and two-phase synchronous rotating coordinate system is established. The power feedforward decoupling control strategy is studied, and the controller is designed to realize the coordination of the shaping circuit and the two-level converter, as well as the control of the DC capacitor voltage. The realization methods of Carrier Phase-Shifting SPWMM (Carrier Phase-Shifting SPWMn) and nearest level Modulation (NLMM) are described in detail, and the startup control strategy of HCMC-STATCOM is analyzed in detail. The effectiveness of the proposed control strategy, modulation strategy and startup strategy is verified by PSCAD / EMTDC simulation. The balance of DC capacitor voltage of H bridge in shaping circuit is the premise of HCMC-STATCOM in normal operation. In this paper, the H bridge DC capacitor voltage balance control strategy based on CPS-SPWM and NLM modulation strategies is studied, and the effectiveness of the proposed capacitor voltage balance control strategy is verified by PSCAD / EMTDC simulation. The parameters of DC capacitors directly affect the overall performance of HCMC-STATCOM. In this paper, the theoretical parameters of H-bridge DC capacitor and two-level converter DC capacitor in shaping circuit are designed, and the number of HCMC-STATCOM and linked Statcom in H-bridge is discussed. The number of power devices, the size of DC capacitance, the number of DC capacitors and the energy stored are analyzed and compared, the advantages and disadvantages of HCMC-STATCOM relative to chain Statcom and other Statcom are summarized, and the design and analysis of these parameters are verified by PSCAD / EMTDC simulation.
【學位授予單位】：浙江大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM761.12;TM46

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