本文選題：微網(wǎng) + 混合儲(chǔ)能��； 參考：《華中科技大學(xué)》2014年碩士論文

【摘要】：近年來隨著環(huán)境污染、化石能源的耗盡、以及電力電子技術(shù)的發(fā)展，越來越多的新能源接入中低壓電網(wǎng)，進(jìn)而出現(xiàn)了供電新形式——微電網(wǎng)，它一般包含多種間歇性能源、負(fù)荷和相關(guān)的監(jiān)控保護(hù)裝置，有并網(wǎng)和孤網(wǎng)兩種運(yùn)行狀態(tài)，主要采用主從控制和對(duì)等控制兩種控制模式。微網(wǎng)為新能源并網(wǎng)打開了新的局面，但是也有諸多問題，例如可能給接入的電網(wǎng)造成功率擾動(dòng)，孤網(wǎng)運(yùn)行時(shí)電壓和頻率難以穩(wěn)定，為了解決這些問題，儲(chǔ)能裝置必不可少。目前儲(chǔ)能元件眾多，各有優(yōu)劣，其中液流電池（VRB）儲(chǔ)存能量大，超級(jí)電容器（EDLC）充放電速度快，所以本文將兩者結(jié)合，設(shè)計(jì)搭建了混合儲(chǔ)能系統(tǒng)，針對(duì)其中DC/DC和DC/AC變換器的控制方法進(jìn)行了研究，最終仿真分析了微網(wǎng)中分布式混合儲(chǔ)能系統(tǒng)的作用。 本文首先介紹了微網(wǎng)的基本結(jié)構(gòu)和主從和對(duì)等兩種控制模式，對(duì)兩種控制模式的特點(diǎn)進(jìn)行了對(duì)比，并闡述了儲(chǔ)能對(duì)于微網(wǎng)安全穩(wěn)定的必要性，在綜合分析各種儲(chǔ)能技術(shù)的基礎(chǔ)上，提出了液流電池/超級(jí)電容器混合儲(chǔ)能，進(jìn)而開始對(duì)混合儲(chǔ)能系統(tǒng)進(jìn)行了結(jié)構(gòu)設(shè)計(jì)和控制策略研究。 然后，比較了儲(chǔ)能系統(tǒng)并聯(lián)和級(jí)聯(lián)結(jié)構(gòu)，，在此基礎(chǔ)上改進(jìn)得到帶有兩個(gè)DC/DC變換器的級(jí)聯(lián)拓?fù)浣Y(jié)構(gòu)，并分別對(duì)液流電池和超級(jí)電容器進(jìn)行等效建模。新穎的拓?fù)浣Y(jié)構(gòu)為結(jié)合儲(chǔ)能元件的優(yōu)勢(shì)奠定基礎(chǔ)，而DC/DC控制回路中將先進(jìn)的BP神經(jīng)網(wǎng)絡(luò)算法與傳統(tǒng)PID結(jié)合，真正實(shí)現(xiàn)了兩者功率的合理分配——液流電池按照計(jì)劃平穩(wěn)充放電，超級(jí)電容器平抑快速波動(dòng)。針對(duì)微網(wǎng)不同的運(yùn)行方式，對(duì)DC/AC的控制也采取不同的控制目標(biāo)和方法，其中P/V控制，意在維持并網(wǎng)模式下功率交換的恒定和電壓的穩(wěn)定，Droop控制可以實(shí)現(xiàn)并網(wǎng)和孤網(wǎng)模式之間的無縫轉(zhuǎn)換，V/f控制則可以維持孤網(wǎng)模式下電壓頻率的無差控制。 最后，仿真分析了混合儲(chǔ)能對(duì)微網(wǎng)的三大作用，包括改善電能質(zhì)量、提高供電可靠性和優(yōu)化間歇性能源出力。此外，針對(duì)因Droop控制參數(shù)不合理引起的問題，提出了一種參數(shù)優(yōu)化的方法，在等效簡(jiǎn)化微網(wǎng)結(jié)構(gòu)之后，該方法以系統(tǒng)小信號(hào)狀態(tài)空間方程為基礎(chǔ)，綜合考慮了系統(tǒng)漸近穩(wěn)定、控制帶寬和魯棒性等因素，通過混沌粒子群算法尋優(yōu)求出參數(shù)，最終仿真驗(yàn)證了該參數(shù)可以維持系統(tǒng)的電壓和頻率穩(wěn)定，并實(shí)現(xiàn)功率的合理分配。
[Abstract]:In recent years, with the environmental pollution, the depletion of fossil energy, and the development of power electronics technology, more and more new energy sources are connected to the medium-low voltage power grid, and then a new form of power supply-microgrid has emerged, which generally contains a variety of intermittent energy. Load and related monitoring and protection devices have two operation states, connected and isolated, which are mainly controlled by master-slave control and peer-to-peer control. The microgrid opens up a new situation for the new energy grid, but there are many problems, such as the power disturbance of the connected power grid and the difficulty of voltage and frequency stability during the operation of the isolated grid. In order to solve these problems, the energy storage device is essential. At present, there are many energy storage components, each of which has its own advantages and disadvantages, among which the liquid flow battery (VRB) has a large energy storage capacity and a supercapacitor (EDLC) charge / discharge speed is high. So, a hybrid energy storage system is designed and built in this paper. The control methods of DC / DC and DC / AC converters are studied. Finally, the function of distributed hybrid energy storage system in microgrid is simulated and analyzed. This paper first introduces the basic structure of microgrid and the master-slave and peer-to-peer control modes, compares the characteristics of the two control modes, and expounds the necessity of energy storage for the security and stability of microgrid. Based on the comprehensive analysis of various energy storage technologies, the hybrid energy storage of liquid flow battery / supercapacitor is proposed, and the structure design and control strategy of the hybrid energy storage system are studied. Then, the parallel and cascade structures of the energy storage system are compared, and the cascade topology with two DC / DC converters is improved, and the equivalent modeling of the liquid-flow battery and the supercapacitor is carried out respectively. The novel topology lays the foundation for combining the advantages of energy storage elements, and the DC / DC control loop combines the advanced BP neural network algorithm with the traditional pid, and realizes the reasonable distribution of the power between them-the liquid flow battery charges and discharges smoothly according to the plan. Supercapacitors neutralize rapid fluctuations. According to the different operation mode of microgrid, the control of DC / AC also adopts different control objectives and methods, among which the P / V control, The purpose of this paper is to maintain constant power exchange and stable voltage in grid-connected mode. It can realize the seamless conversion between grid-connected and isolated grid-mode and can maintain the no-difference control of voltage frequency in isolated mode. Finally, three functions of hybrid energy storage on microgrid are simulated and analyzed, including improving power quality, improving reliability of power supply and optimizing intermittent energy output. In addition, in order to solve the problem caused by unreasonable Droop control parameters, a parameter optimization method is proposed. After equivalent simplification of microgrid structure, the method is based on the small signal state space equation of the system and considers the asymptotic stability of the system synthetically. Controlling bandwidth and robustness, the parameters are obtained by chaotic particle swarm optimization algorithm. The simulation results show that the parameters can maintain the voltage and frequency stability of the system and realize the reasonable power allocation.
【學(xué)位授予單位】：華中科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM46

【相似文獻(xiàn)】

相關(guān)期刊論文 前10條

1 李鵬;張玲;王偉;楊希磊;趙義術(shù);;微網(wǎng)技術(shù)應(yīng)用與分析[J];電力系統(tǒng)自動(dòng)化;2009年20期

2 韓奕;張東霞;胡學(xué)浩;梁才浩;程軍照;梁惠施;;中國(guó)微網(wǎng)標(biāo)準(zhǔn)體系研究[J];電力系統(tǒng)自動(dòng)化;2010年01期

3 撖奧洋;鄧星;文明浩;李惠宇;陳曉燕;;高滲透率下大電網(wǎng)應(yīng)對(duì)微網(wǎng)接入的策略[J];電力系統(tǒng)自動(dòng)化;2010年01期

4 楊仁花;黃偉;關(guān)麗;劉令富;;微網(wǎng)結(jié)構(gòu)和運(yùn)行控制[J];電網(wǎng)與清潔能源;2010年01期

5 王志霞;張會(huì)民;田偉;;微網(wǎng)研究綜述[J];電氣應(yīng)用;2010年06期

6 魯貽龍;王斌;曹祖亮;;儲(chǔ)能系統(tǒng)改善微網(wǎng)動(dòng)態(tài)性能的研究[J];湖北工業(yè)大學(xué)學(xué)報(bào);2010年01期

7 牛銘;黃偉;郭佳歡;蘇玲;;微網(wǎng)并網(wǎng)時(shí)的經(jīng)濟(jì)運(yùn)行研究[J];電網(wǎng)技術(shù);2010年11期

8 馬力;;混合系統(tǒng)微網(wǎng)控制策略分析[J];電力系統(tǒng)及其自動(dòng)化學(xué)報(bào);2010年06期

9 王錫琳;;含有光伏電源的微網(wǎng)綜述[J];安徽電子信息職業(yè)技術(shù)學(xué)院學(xué)報(bào);2011年02期

10 歐陽(yáng)

本文編號(hào)：2084000