【摘要】：為了提高電力系統(tǒng)的穩(wěn)定性及可靠性,柔性交流輸電系統(tǒng)(Flexible AC Transmission Systems,FACTS)作為一項(xiàng)能有效改善電能質(zhì)量的新技術(shù),得到飛速發(fā)展。靜止無功補(bǔ)償器(The Static Synchronous Compensator, STATCOM)是FACTS裝置中的一項(xiàng)新技術(shù)。其中,級聯(lián)型STACOM接口電壓高,補(bǔ)償容量大,具有良好的控制性能和補(bǔ)償效果,成為FACTS裝置的研制熱點(diǎn)。該結(jié)構(gòu)的變換器各個H橋電容都是獨(dú)立的,因此存在充放電不同步造成的直流側(cè)電壓不平衡問題。本文主要研究了電壓平衡控制策略,開展了以下幾個方面的研究工作：(1)針對級聯(lián)型H橋結(jié)構(gòu)的STATCOM分析了無功補(bǔ)償?shù)幕驹?并在此基礎(chǔ)上建立了無功有功解耦的控制系統(tǒng)；理論分析了級聯(lián)型H橋電路直流電壓不平衡的原因,采用基于電容充放電狀態(tài)的直流電壓平衡控制,實(shí)現(xiàn)了各H橋子模塊直流電容電壓的平衡控制和三相之間各H橋子模塊直流電容電壓的平衡控制。其中,單相電壓平衡控制使裝置的每一相內(nèi)部各H橋子模塊的電壓都保持平衡；三相電壓平衡控制保持裝置三相間各H橋子模塊電壓平衡。該控制策略在正常工況和三相電流不平衡時(shí)均能夠保持直流電壓的穩(wěn)定。(2)在理論分析的基礎(chǔ)上,搭建了MATLAB/SIMULINK仿真系統(tǒng),給出了在各種條件下的仿真波形,驗(yàn)證了控制策略的正確性。(3)基于Verilog HDL硬件描述語言完成了全部控制模塊的程序設(shè)計(jì),包括直流電容充放電狀態(tài)的電壓平衡控制和級聯(lián)STATCO M的無功補(bǔ)償控制。實(shí)驗(yàn)結(jié)果驗(yàn)證了直流均壓控制策略的可行性和系統(tǒng)的動靜態(tài)性能。
[Abstract]:In order to improve the stability and reliability of power system, flexible AC transmission system (Flexible AC Transmission Systems,FACTS), as a new technology that can effectively improve power quality, has been developed rapidly. Static Var compensator (The Static Synchronous Compensator, STATCOM) is a new technique in FACTS device. Among them, cascaded STACOM interface has high voltage, large compensation capacity, good control performance and compensation effect, so it has become a hot spot in the development of FACTS device. Each H-bridge capacitance of the converter is independent, so the DC voltage imbalance caused by the non-synchronous charging and discharging exists. In this paper, the voltage balance control strategy is studied, and the following research work is carried out: (1) the basic principle of reactive power compensation is analyzed for cascaded H-bridge STATCOM. On this basis, the reactive power decoupling control system is established. The reason of DC voltage imbalance in cascaded H-bridge circuit is analyzed theoretically, and the DC voltage balance control based on capacitive charge-discharge state is adopted. The balance control of DC capacitor voltage of each H bridge submodule and the balance control of DC capacitor voltage of each H bridge submodule between three phases are realized. The single-phase voltage balance control keeps the voltage balance of each H-bridge module in each phase of the device; the three-phase voltage balance control controls the voltage balance of each H-bridge sub-module between the three phases of the device. The control strategy can maintain the stability of DC voltage under normal condition and unbalanced three-phase current. (2) on the basis of theoretical analysis, the MATLAB/SIMULINK simulation system is built, and the simulation waveform under various conditions is given. The correctness of the control strategy is verified. (3) based on Verilog HDL hardware description language, the program design of all control modules is completed, including voltage balance control of DC capacitor charging and discharging state and reactive power compensation control of cascaded STATCO M. The experimental results verify the feasibility of DC voltage sharing control strategy and the dynamic and static performance of the system.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TM761.12

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