【摘要】：分布式電源以其綠色環(huán)保,儲量豐富等特點,受到了各方越來越多的關(guān)注。隨著對微電網(wǎng)研究的深入,微電網(wǎng)的電能質(zhì)量問題愈加突顯。本文從主從結(jié)構(gòu)下微電網(wǎng)的控制策略和電能質(zhì)量改善措施兩個方面展開研究,以提高微電網(wǎng)的電能質(zhì)量。文章首先總結(jié)了微電網(wǎng)技術(shù)的研究現(xiàn)狀,并對微電網(wǎng)的電能質(zhì)量問題進(jìn)行了分析。建立了微電網(wǎng)并網(wǎng)逆變器在abc三相靜止坐標(biāo)系和dq同步旋轉(zhuǎn)坐標(biāo)系下的數(shù)學(xué)模型,推導(dǎo)了恒功率控制器和恒頻恒壓控制器的結(jié)構(gòu)。利用LCL型濾波器作為微電網(wǎng)并網(wǎng)逆變器的輸出濾波環(huán)節(jié),并對LCL型濾波器的性能進(jìn)行了詳細(xì)分析,同時介紹了LCL型濾波器的參數(shù)設(shè)計方法。在PSCAD仿真軟件對上述理論分析進(jìn)行了仿真驗證,仿真結(jié)果表明采用上述控制方法和LCL型濾波器,能夠?qū)崿F(xiàn)微電網(wǎng)的穩(wěn)定運行,減少微電源和并網(wǎng)逆變器對微電網(wǎng)電能質(zhì)量的影響。其次,本文在總結(jié)前人對微電網(wǎng)中的電能質(zhì)量問題的研究和所提出的改善方案的基礎(chǔ)上,采用了一種新型的能夠?qū)崿F(xiàn)微電網(wǎng)對傳統(tǒng)大電網(wǎng)并網(wǎng)發(fā)電、無功補(bǔ)償和諧波抑制等多種功能復(fù)合的微電源并網(wǎng)逆變器的復(fù)合控制方法,并詳細(xì)推導(dǎo)其工作原理:通過將電網(wǎng)電流的諧波檢測信號與恒功率控制下功率環(huán)的輸出信號進(jìn)行疊加,并將此復(fù)合信號通過電流控制環(huán)節(jié)和PWM控制環(huán)節(jié),實現(xiàn)并網(wǎng)逆變器的多功能運行。并詳細(xì)分析了并網(wǎng)逆變器復(fù)合控制中電網(wǎng)電流諧波檢測環(huán)節(jié)和SVPWM控制環(huán)節(jié)的現(xiàn)實方法。并在PSCAD中建立仿真模型,對所采用的復(fù)合控制方法進(jìn)行仿真驗證,仿真結(jié)果驗證了所提上述理論分析的正確性。最后,搭建了以TMS320F28335為控制芯片的實驗平臺,編寫系統(tǒng)軟件程序,完成系統(tǒng)實驗。實驗結(jié)果表明并網(wǎng)逆變器的新型復(fù)合控制方法能夠有效抑制電網(wǎng)諧波。
[Abstract]:The distributed power supply is more and more concerned with its green, environment-friendly and rich reserves. With the deep research of the micro-power grid, the electric energy quality problem of the micro-power grid has become more and more prominent. This paper studies the control strategy and power quality improvement measures of the micro-power grid under the master-slave structure, so as to improve the power quality of the micro-power grid. In this paper, the research status of the micro-grid technology is summarized, and the electric energy quality problem of the micro-power grid is analyzed. The mathematical model of the grid-connected inverter of the micro-power grid under the abc three-phase static coordinate system and the dq synchronous rotating coordinate system is established, and the structure of the constant-power controller and the constant-frequency constant-voltage controller is deduced. The LCL-type filter is used as the output filter of the grid-connected inverter of the micro-power grid, and the performance of the LCL-type filter is analyzed in detail, and the parameter design method of the LCL-type filter is also introduced. The simulation results show that the above-mentioned control method and the LCL-type filter can realize the stable operation of the micro-power grid and reduce the influence of the micro-power supply and the grid-connected inverter on the power quality of the micro-power grid. Secondly, on the basis of summarizing the previous research on the electric energy quality problem in the micro-power grid and the proposed improvement scheme, a new type of grid-connected power generation can be realized by using a new type of micro-power grid, The invention discloses a compound control method of a micro-power grid-connected inverter which is combined by a plurality of functions such as reactive power compensation and harmonic suppression, and the working principle thereof is deduced in detail: the harmonic detection signal of the power grid current is superposed with the output signal of the power ring under constant power control, And the multi-functional operation of the grid-connected inverter is realized through the current control link and the PWM control link. In this paper, the real-time method of the power grid current harmonic detection and the SVPWM control link in the compound control of grid-connected inverter is analyzed in detail. And a simulation model is established in the PSCAD, the adopted compound control method is simulated and verified, and the simulation result verifies the correctness of the theoretical analysis. Finally, the experiment platform with TMS320F28335 as the control chip is set up, the system software program is written, and the system experiment is completed. The experimental results show that the new compound control method of the grid-connected inverter can effectively suppress the harmonic of the power grid.
【學(xué)位授予單位】：華中科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TM732

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