本文選題：T型結(jié)構(gòu) + 三電平��； 參考：《東華大學(xué)》2014年碩士論文

【摘要】：隨著社會經(jīng)濟的發(fā)展和工業(yè)水平的提高,傳統(tǒng)電網(wǎng)高成本,運營難度大,安全可靠性差等弊端越發(fā)凸顯。分布式發(fā)電具有安裝簡單、污染低、效率高、性能可靠等優(yōu)點,能夠很好地解決傳統(tǒng)集中式的大電網(wǎng)所存在的問題。但是太陽能、風(fēng)能等可再生分布式能源有波動性、間歇性等缺點,分布式能源的大量接入會影響電網(wǎng)的安全和穩(wěn)定。儲能技術(shù)的應(yīng)用在電網(wǎng)和用戶間增加了一級能量緩沖,無論是對可再生能源的大量接入,還是微網(wǎng)孤網(wǎng)(孤島)的穩(wěn)定運行,都提供了一種有效的方式。電池儲能是一種常用的儲能方式,具有特性好、儲能密度較高、環(huán)境條件好、技術(shù)成熟、對安裝地點無特殊要求等優(yōu)點,有著巨大的應(yīng)用前景。用于電池儲能的能量轉(zhuǎn)換系統(tǒng)(Power Conversion System, PCS),做為電池與電網(wǎng)的接口,其性能好壞,直接影響電池儲能的效率和電網(wǎng)的穩(wěn)定運行。 三電平電路相較于傳統(tǒng)的兩電平電路,在用于電池儲能并網(wǎng)這類高壓大容量場合,有著顯著的優(yōu)勢。而T型三電平拓?fù)?相比于傳統(tǒng)的NPC三電平拓?fù)?具有導(dǎo)通損耗小,空間體積小,保護簡單等優(yōu)點,在一定的功率等級和開關(guān)頻率下,較NPC三電平拓?fù)溆兄叩哪芰棵芏群透叩男省１疚难芯苛艘环N用于電池儲能的T型三電平能量轉(zhuǎn)換系統(tǒng),主要做了以下幾方面工作： (1)對三電平電路和三電平電路的調(diào)制策略進(jìn)行了綜述,介紹了T型三電平電路的結(jié)構(gòu),介紹了其工作原理。對T型三電平電路拓?fù)涞膿p耗進(jìn)行了分析,并給出了電路正常工作時功率器件的導(dǎo)通損耗與開關(guān)損耗的計算方法。 (2)建立了T型三電平并網(wǎng)變流器的數(shù)學(xué)模型,對并網(wǎng)變流器的控制策略進(jìn)行了研究,并給出了變流器的控制結(jié)構(gòu)。對SVPWM調(diào)制算法進(jìn)行了詳細(xì)研究,介紹了中點電壓不平衡產(chǎn)生的機理并提出了解決方法。 (3)搭建了全數(shù)字控制的T型三電平并網(wǎng)變流器實驗平臺,介紹了變流器的主電路組成,對變流器數(shù)字控制電路的軟硬件設(shè)計進(jìn)行了詳細(xì)研究和介紹。 (4)在Matlab\Simulink中搭建了T型三電平并網(wǎng)變流器的仿真模型,通過仿真驗證了控制算法。在搭建的實驗平臺上進(jìn)行了電池充電、放電和充放電切換實驗,進(jìn)一步驗證了控制算法。
[Abstract]:With the development of social economy and the improvement of industrial level, the disadvantages of traditional power grid such as high cost, difficult operation, poor safety and reliability are becoming more and more prominent. Distributed generation has the advantages of simple installation, low pollution, high efficiency and reliable performance. It can solve the problems of traditional centralized power grid. However, renewable distributed energy, such as solar energy and wind energy, has some disadvantages, such as volatility, intermittence and so on. A large number of distributed energy sources will affect the security and stability of power grid. The application of energy storage technology increases the first-order energy buffering between the power grid and users. It provides an effective way to access a large number of renewable energy sources, as well as the stable operation of the microgrid isolated network (isolated island). Battery energy storage is a common energy storage method, which has the advantages of good characteristics, high energy storage density, good environmental conditions, mature technology, no special requirements for installation sites, and has a great application prospect. As the interface between battery and power grid, the power Conversion system used for battery energy storage has good or bad performance, which directly affects the efficiency of battery energy storage and the stable operation of power grid. Compared with traditional two-level circuits, three-level circuits have obvious advantages in high-voltage and high-capacity applications such as battery energy storage and grid-connected. Compared with the traditional NPC three-level topology, T-type three-level topology has the advantages of small turn-on loss, small space volume, simple protection and so on. At a certain power level and switching frequency, It has higher energy density and higher efficiency than NPC three-level topology. In this paper, a T type three-level energy conversion system for battery energy storage is studied. The main work is as follows: In this paper, the modulation strategies of three-level circuit and three-level circuit are summarized, the structure of T-type three-level circuit and its working principle are introduced. The topology loss of T type three-level circuit is analyzed, and the calculation method of the on-loss and switching loss of power device is given when the circuit is in normal operation. The mathematical model of T type three-level grid-connected converter is established, the control strategy of grid-connected converter is studied, and the control structure of the converter is given. The SVPWM modulation algorithm is studied in detail. The mechanism of neutral voltage imbalance is introduced and the solution is proposed. The experimental platform of T type three-level grid-connected converter with digital control is built, the main circuit composition of converter is introduced, and the hardware and software design of digital control circuit of converter is studied and introduced in detail. The simulation model of T type three-level grid-connected converter is built in Matlab\ Simulink, and the control algorithm is verified by simulation. The battery charging, discharging and charge-discharge switching experiments are carried out on the platform, which further verifies the control algorithm.
【學(xué)位授予單位】：東華大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM46

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