【摘要】：隨著能源與環(huán)境問題的日益凸顯，分布式發(fā)電技術(shù)不斷發(fā)展。分布式電源具有發(fā)電方式靈活，對(duì)環(huán)境友好，能源利用率高等優(yōu)點(diǎn)，但是分布式電源的大規(guī)模滲透會(huì)對(duì)大電網(wǎng)穩(wěn)定性產(chǎn)生一些負(fù)面影響。微電網(wǎng)不僅能解決分布式電源大規(guī)模接入的問題，也能發(fā)揮各種分布式電源的優(yōu)勢(shì)，提高供電可靠性和效益。微網(wǎng)逆變器作為微網(wǎng)中的基本電力電子接口單元，對(duì)其進(jìn)行合理有效的控制直接關(guān)系到微網(wǎng)的安全穩(wěn)定運(yùn)行。 本文首先介紹了含儲(chǔ)能環(huán)節(jié)的微電網(wǎng)中儲(chǔ)能逆變器的控制策略，給出了其控制環(huán)路切換方法；然后建立了微電網(wǎng)儲(chǔ)能逆變器的數(shù)學(xué)模型，，對(duì)儲(chǔ)能逆變器的控制環(huán)路進(jìn)行了參數(shù)設(shè)計(jì)；針對(duì)微電網(wǎng)孤島工作情況下負(fù)載不平衡導(dǎo)致的輸出電壓不平衡，本文首先分析了不平衡產(chǎn)生的根本原因，然后比較了幾種負(fù)載不平衡控制方法，最終提出了比例積分加諧振的控制方法，實(shí)現(xiàn)了孤島情況下輸出電壓的平衡控制；微電網(wǎng)并網(wǎng)工作時(shí)，系統(tǒng)的穩(wěn)定性受電網(wǎng)阻抗、微電網(wǎng)逆變器數(shù)量和控制器參數(shù)等因素的影響，本文采用特征值分析法研究微電網(wǎng)系統(tǒng)的穩(wěn)定性，并給出了提高微網(wǎng)穩(wěn)定性的方法；此外，本文在Matlab/Simulink環(huán)境下搭建了微網(wǎng)的仿真模型，驗(yàn)證了本文不平衡控制的有效性和穩(wěn)定性分析的正確性；論文最后根據(jù)系統(tǒng)的要求，設(shè)計(jì)并搭建了一臺(tái)基于數(shù)字控制的100kVA微電網(wǎng)實(shí)驗(yàn)平臺(tái)，給出了微電網(wǎng)儲(chǔ)能逆變器的硬件和軟件設(shè)計(jì)過程，并在此平臺(tái)上完成了微電網(wǎng)孤島和并網(wǎng)雙模式工作和兩種模式之間平滑切換的實(shí)驗(yàn)，最后給出了實(shí)驗(yàn)結(jié)果，驗(yàn)證了微電網(wǎng)控制策略的正確性和可行性。
[Abstract]:With the increasingly prominent energy and environmental problems, distributed power generation technology continues to develop. Distributed power generation has the advantages of flexible generation mode, friendly environment, high energy efficiency and so on. However, large-scale penetration of distributed power generation will have some negative effects on the stability of large power grid. Microgrid can not only solve the problem of large-scale access to distributed power, but also play the advantages of various distributed power, and improve the reliability and efficiency of power supply. As the basic power electronic interface unit in the microgrid, the reasonable and effective control of the microgrid inverter is directly related to the safe and stable operation of the microgrid. In this paper, the control strategy of energy storage inverter in microgrid with energy storage link is introduced, and the control loop switching method is given, and then the mathematical model of energy storage inverter in microgrid is established. The parameters of the control loop of the energy storage inverter are designed, and the fundamental cause of the unbalanced output voltage caused by the load imbalance in the isolated island operation of the microgrid is analyzed in this paper. Then, several load imbalance control methods are compared, and the proportional integration plus resonance control method is put forward, which realizes the balanced control of output voltage in isolated island case, and the stability of the system is subjected to the network impedance when the microgrid is connected to the grid. In this paper, the eigenvalue analysis method is used to study the stability of microgrid system, and the method to improve the stability of microgrid system is given. In this paper, the simulation model of microgrid is built in Matlab/Simulink environment, which verifies the validity of the unbalanced control and the correctness of stability analysis. Finally, according to the requirements of the system, A 100kVA microgrid experimental platform based on digital control is designed and built. The hardware and software design process of the microgrid energy storage inverter is presented. The experiments of island isolation and grid-connected operation and smooth switching between the two modes are carried out on this platform. Finally, the experimental results are given to verify the correctness and feasibility of the microgrid control strategy.
【學(xué)位授予單位】：南京航空航天大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM73

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