發(fā)布時間：2018-09-17 07:23

【摘要】：近年來,基于模塊化多電平換流器(Modular Multilevel Converter,MMC)的高壓直流輸電(High Voltage Direct Current,HVDC)因其輸出波形諧波含量低、響應(yīng)速度快和模塊化水平高等優(yōu)勢,在大規(guī)�？稍偕�能源并網(wǎng)以及孤島供電等領(lǐng)域得到廣泛關(guān)注與應(yīng)用。為了保證MMC-HVDC系統(tǒng)各個元件參數(shù)和設(shè)計的控制策略的可行性與有效性,需要進行不同工況下的各種試驗。由于其控制系統(tǒng)復(fù)雜、換流器含有大量電力電子器件,采用數(shù)字仿真無法反映其動態(tài)特性。通過物理動態(tài)仿真能夠?qū)�換流器控制系統(tǒng)的性能進行仿真測試,詳細反映各種運行狀態(tài)下?lián)Q流器中功率器件、電容器、橋臂電抗器的動態(tài)特性。本文對物理動態(tài)仿真系統(tǒng)的等效原則、系統(tǒng)構(gòu)建方法、硬件電路設(shè)計及相關(guān)控制策略開展研究。分析了MMC換流器的基本工作原理,對換流器拓撲結(jié)構(gòu)、動態(tài)數(shù)學(xué)模型和解耦控制方法進行了研究,并對其運行控制和換流器調(diào)制方法進行了分析,包括預(yù)充電控制策略、最近電平逼近調(diào)制策略和子模塊電容均壓控制策略,為物理動態(tài)仿真系統(tǒng)構(gòu)建提供基礎(chǔ)。開展MMC-HVDC物理動態(tài)模擬仿真系統(tǒng)設(shè)計,構(gòu)建了物理動態(tài)仿真系統(tǒng)的總體構(gòu)架,包括一次系統(tǒng)的總體設(shè)計和控制系統(tǒng)架構(gòu)的設(shè)計;對模擬換流閥子模塊等效方法和元器件選擇方法進行了設(shè)計,并設(shè)計了子模塊和控制器硬件電路;對系統(tǒng)的部分控制軟件進行了設(shè)計,提出了提高系統(tǒng)控制器性能的三相鎖相環(huán)控制算法,提出了基于FPGA通信的提高數(shù)據(jù)傳輸效率的控制板間數(shù)據(jù)傳輸方法。在所建立的MMC-HVDC物理動態(tài)模擬仿真系統(tǒng)上開展了系統(tǒng)的調(diào)試工作。通過對內(nèi)環(huán)電流PI參數(shù)整定和優(yōu)化,提高了內(nèi)環(huán)控制器的響應(yīng)速度和穩(wěn)定性;通過定無功功率控制和定直流電壓控制實驗,驗證各級控制器控制策略、層間通信協(xié)議的正確性;對正常工況進行仿真測試,檢驗了物理動態(tài)仿真系統(tǒng)的性能。
[Abstract]:In recent years, the high voltage direct current transmission (High Voltage Direct Current,HVDC) based on modularized multilevel converter (Modular Multilevel Converter,MMC) has the advantages of low harmonic output waveform, fast response speed and high modularization level. It has been widely paid attention to and applied in the field of large-scale renewable energy grid and island power supply. In order to ensure the feasibility and effectiveness of each component parameter and designed control strategy of MMC-HVDC system, all kinds of tests under different working conditions are needed. Because of the complexity of the control system and the large number of power electronic devices in the converter, the dynamic characteristics of the converter can not be reflected by digital simulation. Through physical dynamic simulation, the performance of converter control system can be simulated and tested, and the dynamic characteristics of power device, capacitor and bridge arm reactor in various operating states can be reflected in detail. In this paper, the equivalent principle, system construction method, hardware circuit design and related control strategy of the physical dynamic simulation system are studied. The basic working principle of MMC converter is analyzed, the topology structure, dynamic mathematical model and decoupling control method of converter are studied, and the operation control and modulation method of converter are analyzed, including precharge control strategy. The nearest level approach modulation strategy and the capacitor voltage sharing control strategy of the sub-module provide the foundation for the construction of the physical dynamic simulation system. The design of MMC-HVDC physical dynamic simulation system is carried out, and the overall framework of the physical dynamic simulation system is constructed, including the general design of the primary system and the design of the control system architecture. The equivalent method of analog converter valve sub-module and the selection method of components are designed, and the hardware circuit of sub-module and controller is designed, and the part of control software of the system is designed. A three-phase phase-locked loop control algorithm is proposed to improve the performance of the system controller, and a method to improve the efficiency of data transmission between control boards based on FPGA communication is proposed. The debugging work of the system is carried out on the established MMC-HVDC physical dynamic simulation system. The response speed and stability of the inner loop controller are improved by optimizing the PI parameters of the inner loop current, and the correctness of the control strategy and the inter-layer communication protocol are verified by the experiments of constant reactive power control and constant DC voltage control. The performance of the physical dynamic simulation system is tested by simulation test under normal working conditions.
【學(xué)位授予單位】：東北電力大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM721.1;TM743

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本文編號：2245150