【摘要】：新能源發(fā)電技術(shù)的規(guī)模日益擴(kuò)大,并網(wǎng)發(fā)電系統(tǒng)中并網(wǎng)逆變器的控制性能直接影響到并入電網(wǎng)的電能質(zhì)量,在并網(wǎng)發(fā)電系統(tǒng)中有極為重要的作用。為了降低并網(wǎng)電流諧波的含量,并網(wǎng)逆變器需要串接輸出濾波器。LCL型濾波器具有高頻濾波特性,同時LCL型并網(wǎng)逆變器有系統(tǒng)電感量小和系統(tǒng)成本低等優(yōu)點(diǎn),并網(wǎng)逆變器采用LCL濾波器成為并網(wǎng)逆變系統(tǒng)交流輸出濾波環(huán)節(jié)發(fā)展的必然趨勢。但是由于LCL型濾波器存在固有的缺點(diǎn),LCL型并網(wǎng)逆變器的控制算法的研究是十分必要的。本文以三相LCL型并網(wǎng)逆變器為研究對象,對其控制算法進(jìn)行了深入理論研究和分析,為LCL型并網(wǎng)逆變器的并網(wǎng)控制算法提供了理論基礎(chǔ)和設(shè)計(jì)依據(jù),具有理論和工程實(shí)際意義。本文的研究工作具體如下：首先,對并網(wǎng)逆變系統(tǒng)的基本結(jié)構(gòu)進(jìn)行了簡單介紹,分析了LCL型并網(wǎng)逆變器在三相靜止坐標(biāo)系、兩相靜止坐標(biāo)系和同步旋轉(zhuǎn)坐標(biāo)系下的數(shù)學(xué)模型,并對LCL濾波器的工作特性和參數(shù)的選取準(zhǔn)則進(jìn)行分析,介紹了一種LCL濾波器參數(shù)設(shè)計(jì)方法。其次,針對LCL型并網(wǎng)逆變器,理論研究了并網(wǎng)電流單閉環(huán)控制算法和電容電流反饋控制算法,分析了各自的優(yōu)缺點(diǎn),在此基礎(chǔ)上,給出了一種并網(wǎng)電流反饋及電網(wǎng)電壓前饋的控制算法,在保證系統(tǒng)穩(wěn)定性的情況下,同時克服了電容電流反饋控制算法電流傳感器數(shù)量較多的問題,通過仿真驗(yàn)證了該算法的有效性。再次,針對電網(wǎng)電壓存在諧波下的LCL型并網(wǎng)逆變器,分析了并網(wǎng)逆變系統(tǒng)中電網(wǎng)電壓諧波導(dǎo)致并網(wǎng)電流諧波的產(chǎn)生機(jī)理,而當(dāng)并網(wǎng)逆變器采用LCL型濾波器時,并網(wǎng)電流的質(zhì)量受其影響較為嚴(yán)重。為了抑制電網(wǎng)電壓諧波的影響,分析了基于比例諧振控制的控制算法,其本質(zhì)是提高了并網(wǎng)逆變器的輸出阻抗的模值,因此在推導(dǎo)出其輸出阻抗模型的基礎(chǔ)上,分析了逆變器輸出阻抗與抗擾性能之間的關(guān)系,并引入了并聯(lián)虛擬阻抗技術(shù)對逆變器輸出阻抗進(jìn)行校正以抑制電網(wǎng)電壓諧波的影響,比例諧振控制和虛擬阻抗技術(shù)的仿真結(jié)果表明控制算法是有效和正確的。最后,在RT-LAB實(shí)時仿真器和TMS320F2812控制器的半實(shí)物仿真平臺上,針對上述LCL型并網(wǎng)逆變器的控制算法進(jìn)行了相關(guān)的半實(shí)物仿真驗(yàn)證,半實(shí)物仿真結(jié)果進(jìn)一步驗(yàn)證了本文中控制算法的正確性和有效性。
[Abstract]:The scale of new energy generation technology is increasing day by day. The control performance of grid-connected inverter in grid-connected power generation system directly affects the power quality of grid-connected power generation system and plays an important role in grid-connected power generation system. In order to reduce the harmonic content of grid-connected current, the grid-connected inverter needs serial output filter. LCL-type inverter has the characteristics of high-frequency filtering. At the same time, the LCL-type grid-connected inverter has the advantages of small system inductance and low system cost. The application of LCL filter in grid-connected inverter becomes the inevitable trend of AC output filter in grid-connected inverter system. However, due to the inherent shortcomings of LCL filter, it is necessary to study the control algorithm of LCL grid-connected inverter. In this paper, the control algorithm of three-phase LCL grid-connected inverter is studied and analyzed deeply, which provides the theoretical basis and design basis for the grid-connected control algorithm of LCL-type grid-connected inverter. It is of theoretical and practical significance. The research work in this paper is as follows: firstly, the basic structure of grid-connected inverter system is briefly introduced, and the mathematical models of LCL-type grid-connected inverter in three-phase static coordinate system, two-phase static coordinate system and synchronous rotating coordinate system are analyzed. The working characteristic and parameter selection criterion of LCL filter are analyzed, and a parameter design method of LCL filter is introduced. Secondly, for LCL type grid-connected inverter, the single closed-loop control algorithm and capacitor current feedback control algorithm are studied theoretically, and their advantages and disadvantages are analyzed. A control algorithm of grid-connected current feedback and grid voltage feedforward is presented. Under the condition of ensuring the stability of the system, the problem of the large number of current sensors in the capacitive current feedback control algorithm is overcome at the same time. The validity of the algorithm is verified by simulation. Thirdly, the generation mechanism of grid-connected current harmonic caused by grid voltage harmonic in grid-connected inverter is analyzed, and the LCL filter is used when grid-connected inverter adopts LCL filter. The quality of grid-connected current is affected seriously. In order to restrain the influence of voltage harmonic in power network, the control algorithm based on proportional resonance control is analyzed. The essence of the algorithm is to improve the output impedance of grid-connected inverter, so the output impedance model of grid-connected inverter is derived on the basis of its output impedance model. The relationship between the output impedance and the anti-disturbance performance of the inverter is analyzed, and the parallel virtual impedance technique is introduced to correct the output impedance of the inverter in order to restrain the harmonic effect of the power network voltage. The simulation results of proportional resonance control and virtual impedance technique show that the control algorithm is effective and correct. Finally, on the hardware-in-the-loop simulation platform of RT-LAB real-time simulator and TMS320F2812 controller, the relevant hardware-in-the-loop simulation verification is carried out for the control algorithm of the above LCL grid-connected inverter. The hardware-in-the-loop simulation results further verify the correctness and effectiveness of the control algorithm in this paper.
【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】：TM464

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