本文選題：并網(wǎng)逆變器 + 電網(wǎng)阻抗��； 參考：《上海電機(jī)學(xué)院》2017年碩士論文

【摘要】：隨著傳統(tǒng)非可再生能源總量不斷減少和環(huán)境污染等問題的日益加劇,促使了以風(fēng)能、太陽能等為代表的可再生能源的研發(fā)和利用。風(fēng)電變流器是風(fēng)力發(fā)電機(jī)所發(fā)電能并入電網(wǎng)的必經(jīng)環(huán)節(jié),但在連接變流器與電網(wǎng)的輸電網(wǎng)絡(luò)中存在的電網(wǎng)阻抗會(huì)影響到變流器的穩(wěn)定控制,因此,需要對考慮電網(wǎng)阻抗時(shí)維持風(fēng)電變流器穩(wěn)定控制的方法進(jìn)行研究,主要內(nèi)容為:(1)在建立三相帶LCL濾波的并網(wǎng)逆變器數(shù)學(xué)模型基礎(chǔ)上,分析了兩相靜止坐標(biāo)系下的并網(wǎng)逆變器控制系統(tǒng),推導(dǎo)了并網(wǎng)逆變器控制系統(tǒng)中電流環(huán)的開環(huán)傳遞函數(shù),利用MATLAB仿真分析加入電網(wǎng)阻抗前后控制系統(tǒng)的穩(wěn)定性。(2)在注入非特征諧波、利用系統(tǒng)固有諧波以及基于復(fù)數(shù)濾波器的測量原理的基礎(chǔ)上,研究了一種改進(jìn)的注入非特征諧波測量阻抗的方法,并在MATLAB/SIMULINK中搭建仿真模型,仿真驗(yàn)證了該方法可以實(shí)現(xiàn)電網(wǎng)阻抗的測量。(3)在考慮電網(wǎng)阻抗時(shí),分析三相并網(wǎng)逆變系統(tǒng)中控制參數(shù)的設(shè)計(jì)過程,得出了控制參數(shù)與電網(wǎng)阻抗的關(guān)系表達(dá)式,仿真驗(yàn)證表明,適應(yīng)阻抗變化的控制參數(shù)起到維持控制系統(tǒng)穩(wěn)定的作用。(4)基于控制參數(shù)與電網(wǎng)阻抗的關(guān)系,設(shè)計(jì)了電網(wǎng)阻抗自適應(yīng)的并網(wǎng)逆變系統(tǒng)控制結(jié)構(gòu),并在MATLAB/SIMULINK中搭建仿真模型,仿真結(jié)果表明,與控制參數(shù)不隨阻抗變化時(shí)相比,根據(jù)電網(wǎng)阻抗的變化來調(diào)節(jié)系統(tǒng)控制參數(shù),可以較好的維持三相并網(wǎng)逆變系統(tǒng)的穩(wěn)定。
[Abstract]:With the decrease of the total amount of traditional non-renewable energy and the worsening of environmental pollution, the research and development and utilization of renewable energy, such as wind energy and solar energy, have been promoted. Wind power converter is a necessary link for wind power generation to merge into the power grid. However, the network impedance existing in the transmission network connecting the converter and the power grid will affect the stability control of the converter. It is necessary to study the method of maintaining the stability control of wind converter when considering the impedance of power network. The main content is: 1) based on the mathematical model of three-phase grid-connected inverter with LCL filter, The control system of grid-connected inverter in two-phase static coordinate system is analyzed, and the open-loop transfer function of current loop in grid-connected inverter control system is derived. MATLAB simulation is used to analyze the stability of the control system before and after adding impedance to the power network. Based on the injection of non-characteristic harmonics, the inherent harmonics of the system and the measurement principle based on complex filter, the stability of the control system is analyzed. An improved method for measuring impedance by injecting non-characteristic harmonics is studied, and a simulation model is built in MATLAB/SIMULINK. The simulation results show that the method can be used to measure the impedance of power network. The design process of control parameters in three-phase grid-connected inverter system is analyzed, and the relationship between control parameters and grid impedance is obtained. The simulation results show that, Based on the relation between control parameters and grid impedance, the control structure of grid impedance adaptive grid-connected inverter system is designed, and the simulation model is built in MATLAB/SIMULINK. The simulation results show that the stability of the three-phase grid-connected inverter system can be maintained better by adjusting the control parameters according to the change of the impedance of the power network than when the control parameters do not change with the impedance.
【學(xué)位授予單位】：上海電機(jī)學(xué)院
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM46

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本文編號(hào)：1934665