本文選題：PWM整流器 + 虛擬磁鏈觀測(cè)器��； 參考：《中南大學(xué)》2014年碩士論文

【摘要】：PWM整流器以其網(wǎng)側(cè)電流信號(hào)的正弦化、功率因素單位運(yùn)行、能量雙向流動(dòng)等特點(diǎn),被廣泛地運(yùn)用于變流變頻裝置,如電力電子新能源、電力系統(tǒng)、工業(yè)控制等領(lǐng)域。目前,PWM整流器控制大多是建立在精確的數(shù)學(xué)模型之上的,很難適應(yīng)電網(wǎng)頻率波動(dòng)和幅值不平衡條件。因此,研究一種在未知環(huán)境下仍能穩(wěn)定運(yùn)行的PWM整流器具有重大意義。 從PWM整流器工作原理出發(fā),以電壓型PWM整流器(VSR)為對(duì)象,建立數(shù)學(xué)模型。分析了虛擬磁鏈觀測(cè)器工作原理,將二階廣義積分器自適應(yīng)濾波器(SOGI-AF)與頻率跟蹤環(huán)節(jié)(FLL)結(jié)合(稱(chēng)為SOGI-FLL)用于虛擬磁鏈觀測(cè)器,消除傳統(tǒng)積分環(huán)節(jié)帶來(lái)的直流偏移和抑制高次諧波,跟蹤電網(wǎng)頻率波動(dòng),適應(yīng)電網(wǎng)不平衡條件,進(jìn)而估計(jì)電網(wǎng)矢量同步角度。結(jié)合內(nèi)�？刂�(IMC)和PWM整流器控制特點(diǎn),用一自由度內(nèi)�？刂迫〈鶳I控制實(shí)現(xiàn)PWM整流器電流內(nèi)環(huán)解耦；采取三自由度內(nèi)模電壓環(huán)控制,消除PWM整流器對(duì)模型的依賴(lài)性,實(shí)現(xiàn)系統(tǒng)抗擾性和魯棒性的獨(dú)立控制。 通過(guò)MATLAB仿真平臺(tái),將SOGI-FLL與IMC結(jié)合用于VSR控制,在100KVA的PWM整流器樣機(jī)上進(jìn)行仿真研究。結(jié)果表明：基于SOGI-FLL的PWM整流器內(nèi)模控制系統(tǒng)在電網(wǎng)波動(dòng)及參數(shù)突然改變的情況下具備良好的跟隨性和魯棒性,驗(yàn)證了提出算法的可行性和優(yōu)越性。圖35幅,參考文獻(xiàn)78篇。
[Abstract]:PWM rectifier is widely used in converter such as power electronic new energy, power system, industrial control and so on because of its sinusoidal current signal, unit operation of power factor, two-way flow of energy and so on. At present, the control of PWM rectifier is mostly based on accurate mathematical model, it is difficult to adapt to the power network frequency fluctuation and amplitude imbalance conditions. Therefore, it is of great significance to study a PWM rectifier which can operate stably in unknown environment. Based on the working principle of PWM rectifier, the mathematical model of VSR is established. The principle of virtual flux observer is analyzed. The second order generalized integrator adaptive filter (SOGI-AFF) and frequency tracking link FLL (called SOGI-FLL) are applied to the virtual flux observer to eliminate the DC offset caused by the traditional integral link and to suppress the high order harmonics. Tracking the frequency fluctuation of the power network, adapting to the unbalanced condition of the power network, and estimating the synchronization angle of the grid vector. Combined with the control characteristics of IMC) and PWM rectifier, the current inner loop decoupling of PWM rectifier is realized by replacing Pi control with one degree of freedom internal mode control, and the dependence of PWM rectifier on model is eliminated by using three degrees of freedom internal mode voltage loop control. The independent control of system immunity and robustness is realized. Through the MATLAB simulation platform, the SOGI-FLL and IMC are used in VSR control, and the simulation research is carried out on the PWM rectifier prototype of 100KVA. The results show that the internal model control system of PWM rectifier based on SOGI-FLL has good following and robustness under the condition of power grid fluctuation and sudden change of parameters. The feasibility and superiority of the proposed algorithm are verified. There are 35 pictures and 78 references.
【學(xué)位授予單位】：中南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TM461

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