【摘要】：微電網系統(tǒng)充分整合了各分布式電源的優(yōu)勢,削弱其對電力系統(tǒng)的不利影響,從而使分布式發(fā)電系統(tǒng)煥發(fā)活力。微電網系統(tǒng)區(qū)別于分布式發(fā)電系統(tǒng)的主要方面在于：微電網系統(tǒng)既可以脫離大電網孤島運行,也可以結合大電網并網運行。故微電網系統(tǒng)在這兩種模式下的控制以及兩種模式間的平滑切換是保證微電網能夠實現(xiàn)安全穩(wěn)定運行的關鍵。本文針對微電網系統(tǒng)在孤島運行模式、并網運行模式的電壓與頻率的控制、系統(tǒng)由孤島切并網的預同步控制以及由并網且孤島的控制進行了研究,主要內容如下：(1)首先介紹了微電網的產生與發(fā)展背景,對微電網的概念、特點以及各國微電網的發(fā)展現(xiàn)狀進行了簡單介紹；最后,對微電網系統(tǒng)的三種控制結構、四種控制策略進行了詳細分析,并引出對應框圖；(2)文中對雙環(huán)逆變器電路進行結構分析,給出雙環(huán)逆變器的等效電路；同時為實現(xiàn)孤島模式下電壓與頻率的無差調節(jié),本文采用二次調壓／調頻控制算法完成對給定值的跟蹤;(3)文中對系統(tǒng)并網運行進行了分析,在傳統(tǒng)下垂控制基礎上提出一種改進方法,以維持輸出功率恒定;最后針對系統(tǒng)離網到并網的平滑切換,提出并設計了預同步算法控制器,同時引出此過程中各單元分配系數(shù)公式；(4)將MGCC按系統(tǒng)通信機制、連接方式、組態(tài)界面等方面的要求進行設計,從而確保MGCC各項等功能的順利實現(xiàn)；同時分別在Matlab/Simulink環(huán)境下和實驗平臺中對上述功能進行了仿真分析與實驗驗證,仿真與實驗結果表明MGCC控制算法對微電網系統(tǒng)的有效性與可行性；
[Abstract]:The microgrid system fully integrates the advantages of the distributed generation and weakens its adverse influence on the power system, thus making the distributed generation system vibrant. The main difference between microgrid system and distributed generation system lies in that the microgrid system can be operated not only from the island of large power grid, but also combined with large grid. Therefore, the control of microgrid system in these two modes and the smooth switching between the two modes are the key to ensure the safe and stable operation of microgrid. In this paper, the control of voltage and frequency of microgrid system in islanding operation mode, grid-connected operation mode, pre-synchronous control of islanding and grid-connected system, and the control of grid-connected and isolated island are studied in this paper. The main contents are as follows: (1) the background of microgrid is introduced, the concept and characteristics of microgrid and the development status of microgrid in various countries are briefly introduced. Finally, three control structures of microgrid system are introduced. Four control strategies are analyzed in detail, and corresponding block diagrams are drawn. (2) the structure of double loop inverter circuit is analyzed in this paper, and the equivalent circuit of double loop inverter is given. At the same time, in order to realize the voltage and frequency regulation in isolated mode, In this paper, the quadratic voltage regulation / frequency modulation control algorithm is used to track the given value. (3) the system grid-connected operation is analyzed, and an improved method is proposed based on the traditional droop control to keep the output power constant. Finally, a presynchronization algorithm controller is proposed and designed for the smooth switching from the system off the grid to the grid-connected network. At the same time, the formula of the allocation coefficient of each unit in the process is derived. (4) the MGCC is connected according to the communication mechanism of the system and the connection mode. The requirements of the configuration interface are designed to ensure the smooth realization of the functions of MGCC. At the same time, the above functions are simulated and verified in the Matlab/Simulink environment and the experimental platform. Simulation and experimental results show the effectiveness and feasibility of MGCC control algorithm for microgrid systems.
【學位授予單位】：合肥工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：TM732

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