本文選題：儲(chǔ)能系統(tǒng)　切入點(diǎn)：變流器　出處：《浙江大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著社會(huì)的發(fā)展和新能源技術(shù)的進(jìn)步,風(fēng)電和光伏等間歇式能源發(fā)電在電力系統(tǒng)中占有越來越重要的地位。而間歇式能源的隨機(jī)性和間歇性對(duì)電網(wǎng)的安全穩(wěn)定運(yùn)行提出了新的挑戰(zhàn)。儲(chǔ)能系統(tǒng)則憑借其快速、可控的特點(diǎn)在提升電網(wǎng)的電能質(zhì)量、運(yùn)行穩(wěn)定性及供電可靠性等方面發(fā)揮著重要作用,得到了廣泛的應(yīng)用,這對(duì)間歇式能源發(fā)電的弊端起到了重要的彌補(bǔ)作用。對(duì)儲(chǔ)能系統(tǒng)及其應(yīng)用的研究成為近年電力系統(tǒng)研究中的一大熱點(diǎn)。然而,目前對(duì)于儲(chǔ)能系統(tǒng)的故障診斷及保護(hù)方面的研究卻不多。因此,對(duì)儲(chǔ)能系統(tǒng)的故障診斷及保護(hù)方面進(jìn)行深入的研究具有重要的意義。 本文以儲(chǔ)能系統(tǒng)為研究對(duì)象,以電池儲(chǔ)能系統(tǒng)為例,對(duì)儲(chǔ)能變流器的數(shù)學(xué)模型進(jìn)行了較為嚴(yán)格的推導(dǎo),作為儲(chǔ)能變流器設(shè)計(jì)的理論基礎(chǔ)。同時(shí)對(duì)儲(chǔ)能系統(tǒng)并網(wǎng)運(yùn)行時(shí)的控制策略進(jìn)行了研究,對(duì)儲(chǔ)能變流器PQ控制的實(shí)現(xiàn)作了詳細(xì)的分析。在對(duì)儲(chǔ)能變流器數(shù)學(xué)模型和并網(wǎng)控制策略進(jìn)行分析研究的基礎(chǔ)上,在PSCAD/EMTDC仿真平臺(tái)上搭建了儲(chǔ)能系統(tǒng)的仿真模型。 本文最重要的工作是對(duì)儲(chǔ)能變流器的各種故障進(jìn)行分析和仿真研究。儲(chǔ)能變流器故障具體分為橋臂IGBT開路故障和短路故障兩大類。各種故障具有不同的特點(diǎn)。在對(duì)電池儲(chǔ)能系統(tǒng)變流器開路故障特性進(jìn)行分析的基礎(chǔ)上,對(duì)變流器交直流側(cè)電氣量的變化進(jìn)行定性的描述,從中獲得可以反映變流器故障的特征量作為故障診斷與定位的依據(jù)。對(duì)電池儲(chǔ)能系統(tǒng)變流橋短路故障的各種情況及變流橋IGBT的閉鎖情況進(jìn)行列舉,對(duì)各種可能進(jìn)行細(xì)致的分析,繪制各種情況下的故障分析的等效電路,采用狀態(tài)變量分析法或暫態(tài)電路分析的三要素法對(duì)等效電路進(jìn)行分析。最后,借助PSCAD/EMTDC仿真平臺(tái)對(duì)儲(chǔ)能系統(tǒng)變流橋IGBT的開路故障和短路故障的各種情況進(jìn)行了仿真研究,并提出了較為合理的故障診斷和保護(hù)的建議。
[Abstract]:With the development of society and the progress of new energy technology, Intermittent energy generation, such as wind power and photovoltaic, plays an increasingly important role in the power system. The randomness and intermittency of intermittent energy present a new challenge to the safe and stable operation of power grid. The controllable characteristics play an important role in improving the power quality, operation stability and power supply reliability of the power network, and have been widely used. This has played an important role in making up for the disadvantages of intermittent energy generation. The research on energy storage system and its application has become a hot spot in power system research in recent years. However, At present, there are few researches on fault diagnosis and protection of energy storage system. Therefore, it is of great significance to study the fault diagnosis and protection of energy storage system. Taking the energy storage system as the research object and taking the battery energy storage system as an example, the mathematical model of the energy storage converter is deduced strictly in this paper. As the theoretical basis of the design of the energy storage converter, the control strategy of the energy storage system in grid-connected operation is also studied. The realization of PQ control of energy storage converter is analyzed in detail. Based on the analysis of mathematical model and grid-connected control strategy of energy storage converter, the simulation model of energy storage system is built on PSCAD/EMTDC simulation platform. The most important work of this paper is to analyze and simulate the various faults of the energy storage converter. The faults of the energy storage converter can be divided into two categories: the open circuit fault of the bridge arm IGBT and the fault of short circuit. All kinds of faults have different characteristics. Based on the analysis of open circuit fault characteristics of converter of battery energy storage system, The change of AC / DC side electrical quantity of converter is described qualitatively. The characteristic quantity which can reflect the converter fault is obtained as the basis of fault diagnosis and location. The various cases of converter bridge short circuit fault and the locking situation of converter bridge IGBT in battery energy storage system are listed, and the various possibilities are analyzed in detail. Draw the equivalent circuit of fault analysis under various conditions, use the state variable analysis method or the three-element method of transient circuit analysis to analyze the equivalent circuit. Finally, The open circuit fault and short circuit fault of converter bridge IGBT of energy storage system are simulated by means of PSCAD/EMTDC simulation platform, and some reasonable fault diagnosis and protection suggestions are put forward.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TM46

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