發(fā)布時間：2018-01-31 04:26

  本文關(guān)鍵詞： 微電網(wǎng) 虛擬同步發(fā)電機(jī) 零逆流 蓄電池　出處：《安徽理工大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：微電網(wǎng)是大電網(wǎng)的重要補(bǔ)充。但是傳統(tǒng)的控制策略無法做到孤島運(yùn)行時對微電網(wǎng)電壓和頻率的無差控制,尤其是負(fù)載波動時會嚴(yán)重影響到微電網(wǎng)的安全穩(wěn)定運(yùn)行。當(dāng)微電源發(fā)電功率大于負(fù)載功率時,微電網(wǎng)中能量的逆流也會對大電網(wǎng)造成不利的影響。本文以基于虛擬同步發(fā)電機(jī)控制的微電網(wǎng)為研究對象,在穩(wěn)定微電網(wǎng)電壓和頻率的同時,實(shí)現(xiàn)微電網(wǎng)的零逆流。 本文首先介紹微電網(wǎng)的概念和結(jié)構(gòu),以及國內(nèi)外微電網(wǎng)的發(fā)展現(xiàn)狀。同時分析微電網(wǎng)運(yùn)行時并網(wǎng)與孤島控制,并深入研究微電網(wǎng)的協(xié)調(diào)控制和不同接口策略的控制方法。其次,考慮到微電網(wǎng)中的微電源缺少物理慣性,即沒有同步發(fā)電機(jī)的轉(zhuǎn)動慣量,本文將虛擬同步發(fā)電機(jī)控制運(yùn)用到微電網(wǎng)中。通過對同步發(fā)電機(jī)的轉(zhuǎn)子機(jī)械特性和定子電氣特性的深入分析,將同步發(fā)電機(jī)的控制運(yùn)用到微電源中,使得微電源能夠克服上述弱點(diǎn),并在功頻控制器和勵磁控制器的調(diào)節(jié)下維持系統(tǒng)的頻率和電壓的穩(wěn)定。同時為了防止微電網(wǎng)中多余的能量逆流進(jìn)入大電網(wǎng),造成大電網(wǎng)的諧波增加并危害到負(fù)荷用電安全,設(shè)計蓄電池作為微電網(wǎng)的儲能裝置。當(dāng)微電源發(fā)電功率大于微電網(wǎng)負(fù)載功率時,通過零逆流的功頻控制器的調(diào)節(jié),使得蓄電池按照指令充放電,將多余能量儲存,以滿足對微電網(wǎng)零逆流的要求。論文對微電網(wǎng)主電路中的LC濾波器和連接感抗的參數(shù)進(jìn)行理論分析和計算,確定實(shí)際應(yīng)用中參數(shù)的取值范圍。最后,使用MATLAB/Simulink軟件搭建仿真模型,仿真結(jié)果表明該方法滿足微電網(wǎng)的性能要求。 將虛擬同步發(fā)電機(jī)的控制策略運(yùn)用到微電網(wǎng)中,既能解決電壓和頻率的無差控制,又能實(shí)現(xiàn)微電網(wǎng)對大電網(wǎng)的零逆流。從性能的角度來看,此方法有著很好的應(yīng)用前景。
[Abstract]:Microgrid is an important supplement to large power grid, but the traditional control strategy can not achieve the islanding voltage and frequency control. Especially when the load fluctuates, it will seriously affect the safe and stable operation of the microgrid. The countercurrent of the energy in the microgrid will also have a negative impact on the large grid. In this paper, the micro-grid based on the virtual synchronous generator control as the research object, while stabilizing the voltage and frequency of the micro-grid. The zero countercurrent of microgrid is realized. This paper first introduces the concept and structure of microgrid, as well as the development of microgrid at home and abroad, and analyzes the operation of microgrid and islanding control. The coordinated control of microgrid and the control methods of different interface strategies are deeply studied. Secondly, considering the lack of physical inertia of micro-power supply in microgrid, that is, the moment of inertia of no synchronous generator. In this paper, the virtual synchronous generator control is applied to the micro-grid, and the control of the synchronous generator is applied to the micro-power supply through the in-depth analysis of the rotor mechanical characteristics and stator electrical characteristics of the synchronous generator. The micro power supply can overcome the above weaknesses and maintain the stability of the frequency and voltage of the system under the regulation of the power and frequency controller and the excitation controller. At the same time, in order to prevent the superfluous energy countercurrent in the microgrid from entering the large power grid. It causes the harmonic increase of large power grid and endangers the safety of power consumption. The storage battery is designed as the energy storage device of the microgrid, when the generation power of micro-power is larger than the load power of micro-grid. By adjusting the zero countercurrent power and frequency controller, the battery is charged and discharged according to the instruction, and the excess energy is stored. In order to meet the requirement of zero countercurrent in microgrid, the paper analyzes and calculates the LC filter and connection reactance parameters in the main circuit of microgrid, and determines the range of parameters in practical application. MATLAB/Simulink software is used to build the simulation model. The simulation results show that the method meets the performance requirements of microgrid. The control strategy of virtual synchronous generator is applied to microgrid, which can not only solve the no-difference control of voltage and frequency, but also realize the zero countercurrent of micro-grid to large power grid. From the point of view of performance. This method has a good application prospect.
【學(xué)位授予單位】：安徽理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM31

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本文編號：1478190