本文選題：MMC + 柔性直流輸電��； 參考：《昆明理工大學》2017年碩士論文

【摘要】：模塊化多電平換流器(Modular Multilevel Converter,MMC)由于具有波形質量好,不需要再配置濾波器裝置,開關損耗低,器件均壓簡單,采用了模塊化設計,容易拓展,可以獨立的控制有功功率和無功功率,可以向無源系統(tǒng)供電等優(yōu)點而得到越來越多的關注與應用,但對于模塊化多電平換流器的柔性直流輸電(MMC-HVDC)的研究還只是處于初始階段。本文主要針對MMC-HVDC系統(tǒng)的控制策略和直流側單極接地故障測距進行分析與研究,本文的結構如下:首先分析了 MMC的拓撲結構及工作原理,分析了子模塊不同的工作狀態(tài),分析了三相模塊化多電平換流器的工作原理及模塊化多電平換流器中子模塊的類型。其次,介紹了 MMC-HVDC系統(tǒng)的構成及其主電路的拓撲結構,由主電路拓撲結構圖得到該系統(tǒng)的等效電路圖。分析了 MMC的暫態(tài)數學模型及MMC-HVDC控制系統(tǒng)的組成和結構,研究了各層控制系統(tǒng)的功能與控制器的結構。在PSCDA/EMTDC仿真軟件中搭建了兩端MMC-HVDC系統(tǒng)的仿真模型,對系統(tǒng)在穩(wěn)態(tài)運行時、有功功率發(fā)生階躍時、直流電壓發(fā)生階躍時其他物理量的響應特性進行了仿真分析。再次,分析了電容電壓產生波動及產生環(huán)流的原因,介紹了 MMC電容電壓的均衡控制及環(huán)流抑制控制器的原理,分析了通用環(huán)流抑制器,利用仿真模型驗證了該控制器能夠改善橋臂電流畸變的情況。最后,研究了 MMC-HVDC系統(tǒng)的邊界條件及行波的傳變特性,仿真分析了不同的過渡電阻及不同的故障距離對行波特性的影響。利用行波測距方法對系統(tǒng)的直流側發(fā)生單極接地故障的情況進行了故障測距的研究。
[Abstract]:Because of its good waveform quality, no need to reconfigure filter devices, low switching loss, simple voltage sharing, modularized design and easy expansion, modularized multilevel converter (MMC) is easy to be extended, because of its good waveform quality, low switching loss and simple voltage sharing. More and more attention has been paid to the advantages of controlling active and reactive power independently and supplying power to passive systems. However, the study of modularized multilevel converters for flexible direct current transmission (HVDC) is still in its initial stage. In this paper, the control strategy of MMC-HVDC system and DC side single-pole fault location are analyzed and studied. The structure of this paper is as follows: firstly, the topological structure and working principle of MMC are analyzed, and the different working states of sub-modules are analyzed. The working principle of three-phase modularized multilevel converter and the type of neutron module of modularized multilevel converter are analyzed. Secondly, the structure of the MMC-HVDC system and the topology of the main circuit are introduced. The equivalent circuit diagram of the system is obtained from the topology structure diagram of the main circuit. The transient mathematical model of MMC and the composition and structure of MMC-HVDC control system are analyzed. The functions of each layer control system and the structure of controller are studied. The simulation model of two ends of MMC-HVDC system is built in the PSCDA/EMTDC simulation software. The response characteristics of other physical quantities are simulated and analyzed when the active power step occurs and the DC voltage step occurs when the system is in steady state. Thirdly, the causes of the fluctuation of capacitor voltage and the circulation are analyzed, the equalization control of MMC capacitor voltage and the principle of the loop suppression controller are introduced, and the general circulation suppressor is analyzed. The simulation model is used to verify that the controller can improve the current distortion of the bridge arm. Finally, the boundary conditions of MMC-HVDC system and the transmission characteristics of traveling wave are studied, and the effects of different transition resistance and different fault distance on the traveling wave characteristics are simulated and analyzed. The traveling wave fault location method is used to study the fault location of DC side of the system.
【學位授予單位】：昆明理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM721.1;TM46

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