【摘要】：微電網(wǎng)的運行模式包括并網(wǎng)運行和孤島運行,微電網(wǎng)能否平穩(wěn)的運行取決于這兩種模式能否順利的轉(zhuǎn)換,然而關于這兩種模式的轉(zhuǎn)換以及它們之間如何進行控制的問題是非常值得深入研究的。對傳統(tǒng)的配電網(wǎng)來說,分布式電源的接入對其產(chǎn)生了較大的影響,由原先的單電源輻射狀配電網(wǎng)轉(zhuǎn)變成了一個遍布電源和負荷的多電源系統(tǒng),這就使微電網(wǎng)的控制系統(tǒng)也變得更加的復雜。傳統(tǒng)的集中式大電網(wǎng)供電系統(tǒng)供電模式單一,集中且不靈活,而分布式發(fā)電系統(tǒng)供電模式多樣、分散且高度靈活。因此,分布式發(fā)電系統(tǒng)成為了電力工業(yè)的研究熱點和發(fā)展方向。逆變器是連接大電網(wǎng)與分布式發(fā)電單元之間的核心器件,研究逆變器及其控制策略顯得尤為重要,當然這是在保證輸出的電壓和電流滿足并網(wǎng)要求和負荷需求的前提下開展的。本文以分布式發(fā)電系統(tǒng)逆變器為研究對象,對基于分布式發(fā)電系統(tǒng)并網(wǎng)與孤島運行模式之間的無縫切換控制進行了研究。首先,在微電網(wǎng)進行并離網(wǎng)運行時,對逆變器的控制方式(PQ控制、V/f控制)進行了研究。其次,提出了一種以間接電流控制為基礎的協(xié)調(diào)控制,以解決控制策略發(fā)生變化的問題,以便逆變器在分布式發(fā)電系統(tǒng)的運行模式下切換時能夠?qū)崿F(xiàn)平滑切換。進而主逆變器中兩種控制方式得以實現(xiàn)無縫切換也是由于采用了協(xié)調(diào)控制這一環(huán)節(jié)。同時,建立了基于上述控制策略的分布式發(fā)電系數(shù)學模型,通過分析仿真結(jié)果從而驗證了所提控制策略的正確性。
[Abstract]:The operation mode of microgrid includes grid-connected operation and islanding operation. The smooth operation of microgrid depends on the smooth conversion of these two modes. However, the transformation of these two patterns and how to control them are worthy of further study. For the traditional distribution network, the access of distributed generation has a great impact on it, from the original single source radiation distribution network to a multi-power system with power and load. This makes the control system of microgrid more complex. The traditional centralized power supply system is single, centralized and inflexible, while the distributed generation system is diverse, dispersed and highly flexible. Therefore, distributed generation system has become the research hotspot and development direction of power industry. Inverter is the core device between large power grid and distributed generation unit. It is very important to study the inverter and its control strategy. Of course, this is carried out on the premise that the output voltage and current meet the requirements of grid connection and load. In this paper, the seamless switching control between grid-connected and islanded operation mode of distributed generation system is studied, taking the inverter of distributed generation system as the research object. Firstly, the inverter control mode (PQ control, V / F control) is studied when the microgrid is running and running off the grid. Secondly, a kind of coordinated control based on indirect current control is proposed to solve the problem of the change of control strategy, so that the inverter can realize smooth switching when switching in the distributed generation system. Furthermore, the two control modes in the main inverter can realize seamless switching due to the use of coordinated control. At the same time, the mathematical model of distributed generation system based on the above control strategy is established, and the correctness of the proposed control strategy is verified by analyzing the simulation results.
【學位授予單位】：沈陽工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM727

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