本文選題：模塊級(jí)聯(lián)固態(tài)變壓器　切入點(diǎn)：單相D-Q矢量控制　出處：《浙江大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：固態(tài)變壓器又稱電力電子變壓器,是一種通過(guò)電力電子變換技術(shù)實(shí)現(xiàn)電力系統(tǒng)中的電壓變換和能量傳遞的新型變壓器。它將電力電子的器件和變流技術(shù)與高頻變壓器相結(jié)合,實(shí)現(xiàn)傳統(tǒng)電力變壓器電壓等級(jí)轉(zhuǎn)換、隔離的功能。與常規(guī)變壓器相比,固態(tài)變壓器具有器件體積小、重量輕的特點(diǎn)；同時(shí),通過(guò)先進(jìn)的控制技術(shù),它還可以實(shí)現(xiàn)對(duì)原邊電流、副邊電壓以及功率的靈活控制,抑制來(lái)自用戶側(cè)的無(wú)功電流和諧波,降低電網(wǎng)電壓跌落和頻率變化對(duì)用戶端的影響；并能提供低壓直流母線和網(wǎng)絡(luò)接口,可以提供直流供電,整合各種分布式電源,連接儲(chǔ)能裝置,實(shí)現(xiàn)電網(wǎng)中功率潮流的統(tǒng)一協(xié)調(diào)分配,提高整個(gè)電力系統(tǒng)的性能和可靠性。 模塊級(jí)聯(lián)型固態(tài)變壓器是通過(guò)采用對(duì)多個(gè)低壓模塊進(jìn)行串并聯(lián)組合的方式,來(lái)提高其電壓和容量的等級(jí),降低每個(gè)模塊的電壓電流應(yīng)力,同時(shí)用多電平方法可以提高交流側(cè)SPWM波的正弦度,有效減小了濾波器和整機(jī)的體積。但是各個(gè)模塊的均壓、均功率問(wèn)題難以實(shí)現(xiàn),電壓和功率的不平衡使系統(tǒng)在電網(wǎng)電壓波動(dòng)和負(fù)載變化的情況下容易出現(xiàn)故障。 本文分析了模塊級(jí)聯(lián)型固態(tài)變壓器電路拓?fù)涞墓ぷ髟?進(jìn)行了建模并設(shè)計(jì)了電路參數(shù),并搭建了實(shí)驗(yàn)平臺(tái)。本文研究采用一種基于整流級(jí)共同占空比控制與DAB輸入、輸出電壓跟隨控制相結(jié)合的控制策略進(jìn)行控制,并對(duì)這種控制方法進(jìn)行了改進(jìn),不僅有效解決了固態(tài)變壓器各模塊之間均壓、均功率問(wèn)題,還提高了系統(tǒng)的響應(yīng)速度。并最后通過(guò)理論分析、仿真與實(shí)驗(yàn)對(duì)兩種控制方法進(jìn)行了比較,驗(yàn)證了其可行性與可靠性。
[Abstract]:Solid-state transformer, also known as power electronic transformer, is a new type of transformer which realizes voltage conversion and energy transfer in power system through power electronic transformation technology. It combines power electronics devices and converter technology with high-frequency transformer. Compared with conventional transformers, solid-state transformers have the advantages of small size and light weight. At the same time, through advanced control technology, it can also realize the primary current, The flexible control of secondary voltage and power can restrain the reactive current and harmonic from the user side, reduce the influence of voltage drop and frequency change on the user side, and can provide low voltage DC bus and network interface, which can provide DC power supply. All kinds of distributed power sources are integrated, energy storage devices are connected to realize the unified and coordinated distribution of power flow in the power network, and the performance and reliability of the whole power system are improved. Modular cascade solid-state transformer is a series and parallel combination of several low-voltage modules to improve the voltage and capacity of the transformer and reduce the voltage and current stress of each module. At the same time, the sinusoidal degree of AC side SPWM wave can be improved by multilevel method, and the volume of filter and whole machine can be reduced effectively. However, the problem of equalizing voltage and average power of each module is difficult to realize. The imbalance of voltage and power makes the system prone to failure in the case of voltage fluctuation and load variation. In this paper, the working principle of the circuit topology of modular cascade solid-state transformer is analyzed, the circuit parameters are modeled, and the experimental platform is built. A common duty cycle control and DAB input based on the rectifier level are studied in this paper. The output voltage is controlled by the combined control strategy, and the control method is improved, which not only effectively solves the problem of voltage sharing and power sharing among the modules of solid-state transformer, but also improves the control method. Finally, through theoretical analysis, simulation and experiment, the two control methods are compared, and the feasibility and reliability of the two control methods are verified.
【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】：2014
【分類號(hào)】：TM41

【引證文獻(xiàn)】

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7 魏釗;電力電子變壓器的工程設(shè)計(jì)與應(yīng)用[D];湖南大學(xué);2016年

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9 李小棟;H橋級(jí)聯(lián)型電力電子變壓器的控制系統(tǒng)研究[D];湖南大學(xué);2015年

10 楊韜;配電網(wǎng)模塊級(jí)聯(lián)型電力電子變壓器研制[D];湖南大學(xué);2015年

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本文編號(hào)：1617626