本文選題：電力電子變壓器 + 模糊PI�。� 參考：《西南石油大學(xué)》2017年碩士論文

【摘要】：近年來,環(huán)境污染日益嚴(yán)重,化石類能源日益枯竭。分布式新能源不僅能夠緩解能源供應(yīng)危機(jī),解決環(huán)境污染等問題,還具有供電可靠性高、維修管理方便等特點(diǎn)。如何構(gòu)建一個(gè)新能源系統(tǒng),使其具有多種能源共同接入的能力,同時(shí)還能實(shí)現(xiàn)與傳統(tǒng)電網(wǎng)的并聯(lián)運(yùn)行,已經(jīng)成為了分布式新能源發(fā)、輸、變電領(lǐng)域的研究熱點(diǎn)。本文以電力電子變壓器為研究對(duì)象,分別對(duì)其輸入級(jí)、隔離級(jí)的一些關(guān)鍵問題展開了深入研究,并設(shè)計(jì)了電力電子變壓器直流母線處的光伏系統(tǒng)并網(wǎng)方法。論文主要內(nèi)容如下:首先,分析了電力電子變壓器的拓?fù)浣Y(jié)構(gòu)和工作原理,建立了電力電子變壓器的數(shù)學(xué)模型。針對(duì)電力電子變壓器在抑制電能質(zhì)量下降時(shí)動(dòng)態(tài)響應(yīng)慢,調(diào)節(jié)性能差等缺點(diǎn),提出了一種基于dq解耦的輸入級(jí)智能控制策略與隔離級(jí)移相控制策略。前者在系統(tǒng)輸入級(jí)中采用基于模糊PI控制器的雙閉環(huán)控制方法,實(shí)現(xiàn)了電壓外環(huán)PI控制器參數(shù)的實(shí)時(shí)調(diào)整。后者在系統(tǒng)隔離級(jí)雙向DC-DC變換器中采用單移相控制策略,以電力電子變壓器二次側(cè)直流母線電壓為被控對(duì)象,對(duì)高頻隔離變壓器一次側(cè)、二次側(cè)H橋觸發(fā)脈沖之間的移相角進(jìn)行調(diào)整,提高二次側(cè)直流母線電壓的穩(wěn)定性。其次,建立電力電子變壓器直流母線上的光伏并網(wǎng)系統(tǒng),分析了光伏電池的輸出特性和最大功率點(diǎn)跟蹤方法。針對(duì)光照強(qiáng)度變化引起的直流并網(wǎng)電壓不穩(wěn)的情況,提出了兩級(jí)式DC-DC變換器結(jié)構(gòu)以及相應(yīng)的橋臂間移相控制算法。此外,在電力電子變壓器直流母線處引入了超級(jí)電容儲(chǔ)能系統(tǒng),通過Buck-Boost變換器對(duì)超級(jí)電容進(jìn)行充放電,實(shí)現(xiàn)了低電壓穿越時(shí)超級(jí)電容儲(chǔ)能系統(tǒng)向負(fù)載側(cè)供電的孤島運(yùn)行方式,提高了光伏系統(tǒng)的穩(wěn)定性與抗干擾能力。最后,基于Matlab/Simulink仿真平臺(tái),搭建了電力電子變壓器及其光伏并網(wǎng)系統(tǒng)的仿真模型。通過模擬三相交流電網(wǎng)發(fā)生電壓跌落、突升和閃變的電能質(zhì)量問題,對(duì)電力電子變壓器做了對(duì)比仿真研究,其結(jié)果表明本文所提的智能控制算法及移相控制算法對(duì)系統(tǒng)電能質(zhì)量調(diào)節(jié)效果較為顯著,明顯優(yōu)于傳統(tǒng)的控制策略。同時(shí)搭建了光伏直流并網(wǎng)及其儲(chǔ)能系統(tǒng)的仿真模型,通過模擬電網(wǎng)電壓深度跌落和光照強(qiáng)度變化,對(duì)光伏并網(wǎng)系統(tǒng)進(jìn)行仿真分析,其結(jié)果表明本文所提的直流并網(wǎng)方法和橋臂間移相控制方法能夠有效抑制光照強(qiáng)度變化對(duì)并網(wǎng)電壓的影響,并且可以實(shí)現(xiàn)光伏系統(tǒng)低電壓穿越時(shí)系統(tǒng)的穩(wěn)定運(yùn)行,為負(fù)載提供持續(xù)的電能。
[Abstract]:In recent years, environmental pollution is increasingly serious, fossil energy is increasingly depleted. Distributed new energy not only can alleviate the crisis of energy supply and solve environmental pollution problems, but also has the characteristics of high reliability of power supply and convenient maintenance and management. How to build a new energy system with the ability of common access of multiple sources of energy, and at the same time to realize parallel operation with the traditional power grid, has become a research hotspot in the field of distributed new energy generation, transmission and transformation. This paper takes power electronic transformer as research object, studies some key problems of input stage and isolation stage, and designs the grid-connected method of photovoltaic system in DC bus of power electronic transformer. The main contents of this paper are as follows: firstly, the topology and working principle of power electronic transformer are analyzed, and the mathematical model of power electronic transformer is established. In order to overcome the disadvantages of slow dynamic response and poor regulation performance of power electronic transformers, an input level intelligent control strategy based on dq decoupling and an isolated phase shift control strategy are proposed. In the former, a double closed loop control method based on fuzzy Pi controller is used in the input stage of the system, and the parameters of the voltage outer loop Pi controller are adjusted in real time. The latter adopts the single phase shift control strategy in the system isolation stage bidirectional DC-DC converter. The secondary DC bus voltage of the power electronic transformer is taken as the controlled object, and the primary side of the high frequency isolation transformer is used as the control object. The phase shift angle between the trigger pulses of the secondary H-bridge is adjusted to improve the stability of the secondary DC bus voltage. Secondly, the photovoltaic grid-connected system on DC bus of power electronic transformer is established, and the output characteristics of photovoltaic cell and the maximum power point tracking method are analyzed. In view of the instability of DC grid-connected voltage caused by the change of illumination intensity, a two-stage DC-DC converter structure and the corresponding phase shift control algorithm between the arms are proposed. In addition, the super capacitor energy storage system is introduced at the DC bus of power electronic transformer, and the super capacitor is charged and discharged by Buck-Boost converter, which realizes the isolated operation mode of the super capacitor energy storage system to load side when the low voltage traverses. The stability and anti-interference ability of photovoltaic system are improved. Finally, the simulation model of power electronic transformer and its photovoltaic grid-connected system is built based on Matlab/Simulink simulation platform. By simulating the power quality problems of voltage sag, sudden rise and flicker in three-phase AC power network, a comparative simulation study of power electronic transformers is made. The results show that the intelligent control algorithm and phase shift control algorithm proposed in this paper are more effective than the traditional control strategy in regulating the power quality of the system. At the same time, the simulation model of photovoltaic DC grid-connected system and its energy storage system is built, and the photovoltaic grid-connected system is simulated and analyzed by simulating the voltage depth drop and the change of illumination intensity. The results show that the DC grid-connected method and the bridge arm phase shift control method proposed in this paper can effectively restrain the influence of the light intensity change on the grid-connected voltage, and can realize the stable operation of the photovoltaic system with low voltage traversing. Provide continuous power for the load.
【學(xué)位授予單位】：西南石油大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM41;TM615

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本文編號(hào)：1960397