本文關(guān)鍵詞：光伏發(fā)電系統(tǒng)中混合儲(chǔ)能及接入微電網(wǎng)技術(shù)仿真研究　出處：《華北電力大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 光伏發(fā)電 混合儲(chǔ)能 超級(jí)電容 微電網(wǎng) 經(jīng)濟(jì)性

【摘要】：隨著環(huán)境問題和化石燃料短缺的問題日益嚴(yán)峻，太陽能光伏發(fā)電等可分散應(yīng)用的可再生能源將扮演人們生活的重要角色。但光伏發(fā)電自身隨環(huán)境變化具有隨機(jī)性和間歇性，使得光伏發(fā)電微電網(wǎng)系統(tǒng)存在電能質(zhì)量和對(duì)大電網(wǎng)沖擊的問題，所以需要配置儲(chǔ)能系統(tǒng)來維持系統(tǒng)的穩(wěn)定。目前，適用于微電網(wǎng)的儲(chǔ)能電池種類很多，但都各自存在一定的局限性或不足，因此考慮建立環(huán)境友好的能量型鉛酸蓄電池和循環(huán)壽命長的功率型超級(jí)電容組合而成的混合儲(chǔ)能系統(tǒng)。 本文首先介紹了光伏發(fā)電系統(tǒng)的基本原理和數(shù)學(xué)模型，采用理想的光伏并網(wǎng)逆變器模型，并對(duì)微電網(wǎng)結(jié)構(gòu)及運(yùn)行進(jìn)行概述。然后重點(diǎn)研究了儲(chǔ)能系統(tǒng)，包括蓄電池、超級(jí)電容的原理和模型，分別對(duì)各自的充放電特性進(jìn)行仿真分析。根據(jù)對(duì)兩種電池的研究建立通過功率變換器并聯(lián)的有源式混合儲(chǔ)能結(jié)構(gòu)，來優(yōu)化蓄電池的工作過程，提高儲(chǔ)能系統(tǒng)的利用率。根據(jù)構(gòu)建的混合儲(chǔ)能系統(tǒng)，進(jìn)一步設(shè)計(jì)雙向DC/DC變換器、雙向DC/AC變換器的控制策略來控制接入光伏發(fā)電微電網(wǎng)的混合儲(chǔ)能系統(tǒng)。 在深入分析了光伏儲(chǔ)能的特性和混合儲(chǔ)能系統(tǒng)控制策略的基礎(chǔ)上，參考典型微電網(wǎng)結(jié)構(gòu)，在MTLAB/Simulink平臺(tái)建立光伏儲(chǔ)能微電網(wǎng)動(dòng)態(tài)仿真模型，對(duì)儲(chǔ)能單元采用蓄電池和采用混合儲(chǔ)能進(jìn)行對(duì)比，來體現(xiàn)混合儲(chǔ)能的優(yōu)勢(shì)。然后在微電網(wǎng)并網(wǎng)和孤島兩種運(yùn)行模式下，對(duì)光照強(qiáng)度變化和負(fù)載變化情況的系統(tǒng)分別進(jìn)行仿真分析，獲得微電網(wǎng)電壓和頻率的變化規(guī)律，來驗(yàn)證混合儲(chǔ)能控制策略的有效性。結(jié)果表明，混合儲(chǔ)能系統(tǒng)能快速為系統(tǒng)提供有功、無功支撐，保證了電壓和頻率的穩(wěn)定。針對(duì)未來推廣應(yīng)用，通過實(shí)際示范工程案例對(duì)含儲(chǔ)能系統(tǒng)的光伏發(fā)電微電網(wǎng)經(jīng)濟(jì)性進(jìn)行了分析。
[Abstract]:Along with the environmental problems and the shortage of fossil fuels, the problem is becoming more and more serious. Renewable energy sources, such as solar photovoltaic power generation, will play an important role in people's lives. However, photovoltaic power generation itself is random and intermittent with environmental changes. It is necessary to configure the energy storage system to maintain the stability of the system. At present, there are many kinds of energy storage cells suitable for the microgrid. However, each of them has some limitations or shortcomings. Therefore, a hybrid energy storage system based on environment-friendly energy lead-acid batteries and power super capacitors with long cycle life is considered. This paper first introduces the basic principle and mathematical model of photovoltaic power generation system, adopts the ideal photovoltaic grid-connected inverter model, and summarizes the structure and operation of micro-grid, then focuses on the energy storage system. The principle and model of storage battery and super capacitor are simulated and analyzed respectively. According to the study of two kinds of batteries, the active hybrid energy storage structure is established through the power converter shunt. According to the hybrid energy storage system, the bidirectional DC/DC converter is designed. The control strategy of the bidirectional DC/AC converter is used to control the hybrid energy storage system connected to the photovoltaic microgrid. On the basis of deeply analyzing the characteristics of photovoltaic energy storage and the control strategy of hybrid energy storage system, the typical microgrid structure is referred to. The dynamic simulation model of photovoltaic energy storage microgrid is established on MTLAB/Simulink platform, and the battery and hybrid energy storage unit are compared. To reflect the advantages of hybrid energy storage. Then in the microgrid grid-connected and islanding operation mode, the system of light intensity change and load change are simulated and analyzed respectively. The variation of voltage and frequency of microgrid is obtained to verify the effectiveness of hybrid energy storage control strategy. The results show that the hybrid energy storage system can provide active and reactive power support for the system quickly. The stability of voltage and frequency is ensured. The economy of photovoltaic microgrid with energy storage system is analyzed by practical demonstration project.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM615

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