【摘要】：當(dāng)今，全球化石能源日漸枯竭、能源危機(jī)、日益嚴(yán)重的霧霾等問題迫在眉睫，所以對清潔能源風(fēng)能的開發(fā)利用具有非常重要的戰(zhàn)略意義。本文通過分析Quasi-Z源網(wǎng)絡(luò)在逆變器中具有放大輸出電壓的性能，運(yùn)用科學(xué)類比的思維模式將Quasi-Z源網(wǎng)絡(luò)應(yīng)用于傳統(tǒng)的矩陣變換器，以期望突破傳統(tǒng)矩陣變換器中電壓傳輸比僅為0.866的這一瓶頸。為此，本文提出了一種新型的Z源拓?fù)浣Y(jié)構(gòu)，即Quasi-Z源矩陣變換器。采用該Quasi-Z源拓?fù)浣Y(jié)構(gòu)的矩陣變換器的優(yōu)勢在于：能夠有效提高電壓傳輸比；輸出側(cè)電壓電流波形不受輸入側(cè)的影響；有效減小啟動時(shí)變換器開關(guān)器件的沖擊電流，降低損耗。本文研究的主要內(nèi)容分為三個(gè)層面。 首先，從系統(tǒng)的角度分析了變速恒頻雙饋風(fēng)力發(fā)電機(jī)的整體結(jié)構(gòu)特點(diǎn)；闡述了雙饋電機(jī)運(yùn)行原理，接著推導(dǎo)出雙饋電機(jī)的穩(wěn)態(tài)數(shù)學(xué)模型；從實(shí)際應(yīng)用的角度，將參考坐標(biāo)系中的坐標(biāo)變換理論應(yīng)用到了雙饋電機(jī)的動態(tài)電路中，，即推導(dǎo)出了雙饋電機(jī)在d-q坐標(biāo)系下的數(shù)學(xué)模型，在此基礎(chǔ)上本文針對常規(guī)矢量控制中存在電流耦合情況，結(jié)合參考文獻(xiàn)，設(shè)計(jì)出了一種新型、簡易的電流前饋解耦控制方案。 然后，為驗(yàn)證Quasi-Z源矩陣變換器性能，采用MATLAB/SIMULINK軟件來搭建軟件仿真平臺，通過搭建基于Quasi-Z源矩陣變換器的異步感應(yīng)電動機(jī)的模型來進(jìn)行仿真。仿真結(jié)果表明：該Quasi-Z源矩陣變換器具有電壓增益大于1、輸入輸出波形良好、諧波畸變率低等特點(diǎn)。 最后，本文采用PSCAD模型嵌入MATLAB的程序語言的聯(lián)合仿真方式對基于Quasi-Z源矩陣變換器的雙饋風(fēng)力發(fā)電系統(tǒng)進(jìn)行驗(yàn)證。從穩(wěn)態(tài)性能的角度給出了1.5MW、690V雙饋異風(fēng)力發(fā)電系統(tǒng)的電流、電壓、功率、轉(zhuǎn)矩等參數(shù)的手工計(jì)算過程，詳細(xì)的分析了穩(wěn)態(tài)情況下系統(tǒng)的各項(xiàng)參數(shù)的大小。最后比較分析了在不同的風(fēng)速工況下，雙饋風(fēng)力發(fā)電系統(tǒng)有功無功功率的輸出波形，仿真結(jié)果表明了Quasi-Z源矩陣變換器應(yīng)用于雙饋風(fēng)力發(fā)電系統(tǒng)的合理性。
[Abstract]:Nowadays, the global fossil energy is increasingly exhausted, energy crisis, increasingly serious problems such as haze imminent, so the development and utilization of clean energy wind energy has a very important strategic significance. In this paper, the Quasi-Z source network is applied to the traditional matrix converter by analyzing the capability of amplifying the output voltage in the inverter, and applying the scientific analogy mode of thinking to the Quasi-Z source network. It is expected to break through the bottleneck of voltage transfer ratio of 0.866 in traditional matrix converter. Therefore, a new type of Z-source topology, Quasi-Z source matrix converter, is proposed in this paper. The advantages of the matrix converter with Quasi-Z topology are that it can effectively improve the voltage transfer ratio, the output voltage and current waveforms are not affected by the input side, and the impulse current and loss of switching devices are effectively reduced when the converter starts up. The main content of this paper is divided into three levels. First of all, the whole structure characteristics of variable speed constant frequency doubly-fed wind turbine are analyzed from the point of view of system, the operation principle of double-fed wind turbine is expounded, and the steady mathematical model of doubly-fed wind turbine is deduced. The coordinate transformation theory in the reference coordinate system is applied to the dynamic circuit of the doubly-fed machine, that is, the mathematical model of the doubly-fed machine in d-q coordinate system is derived. With reference, a new and simple current feedforward decoupling control scheme is designed. Then, in order to verify the performance of Quasi-Z source matrix converter, MATLAB/SIMULINK software is used to build the software simulation platform, and the model of asynchronous induction motor based on Quasi-Z source matrix converter is built to simulate. The simulation results show that the Quasi-Z source matrix converter has the characteristics of voltage gain greater than 1, good input and output waveform and low harmonic distortion rate. Finally, the paper uses the PSCAD model embedded in the MATLAB programming language to verify the doubly-fed wind power generation system based on Quasi-Z source matrix converter. From the point of view of steady-state performance, the manual calculation process of parameters such as current, voltage, power, torque and so on for 1.5MW / 690V doubly-fed wind power generation system is given, and the parameters of the system under steady state are analyzed in detail. Finally, the output waveforms of active and reactive power of doubly-fed wind power generation system under different wind speed conditions are compared and analyzed. The simulation results show that the Quasi-Z source matrix converter is reasonable for the doubly-fed wind power generation system.
【學(xué)位授予單位】：南昌大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM614

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