發(fā)布時(shí)間：2018-06-22 08:38

  本文選題：PWM變流器 + 直接功率控制�。� 參考：《河南科技大學(xué)》2014年碩士論文

【摘要】：隨著社會的不斷進(jìn)步，人們對能源的需求越來越高，而化石能源又在不斷地減少，為了合理有效地利用能源，儲能技術(shù)成為現(xiàn)今研究的熱點(diǎn)。由于電能生產(chǎn)使用方便而且便于輸送，因此目前主要研究電能的存儲。儲能系統(tǒng)不僅能夠?qū)﹄娋W(wǎng)負(fù)荷進(jìn)行削峰填谷，而且可以促進(jìn)太陽能風(fēng)能等其它可再生能源大規(guī)模接入電網(wǎng)，使得能源更加方便高效地被人們使用。儲能系統(tǒng)中PWM變流器是其核心部分，其性能的好壞直接決定著系統(tǒng)能否高效穩(wěn)定運(yùn)行。 本文主要針對20KW小型儲能站中的PWM可逆變流器進(jìn)行研究和分析。介紹了目前儲能站的研究現(xiàn)狀以及PWM可逆變流器的研究現(xiàn)狀和發(fā)展方向，闡述了研究PWM變流器具有深遠(yuǎn)的社會效益。分析PWM變流器四象限運(yùn)行的工作原理以及變流器常見的拓?fù)浣Y(jié)構(gòu)和控制策略。以三相電壓型PWM變流器為研究對象，建立其在三相靜止坐標(biāo)系、兩相靜止坐標(biāo)系和兩相旋轉(zhuǎn)坐標(biāo)系下的數(shù)學(xué)模型，在數(shù)學(xué)模型的基礎(chǔ)上對PWM變流器進(jìn)行整流、逆變的研究。 在引入瞬時(shí)功率概念的基礎(chǔ)上，本文主要研究和分析PWM變流器的直接功率控制策略。整流工作時(shí)，分析研究直接功率控制策略的原理及系統(tǒng)結(jié)構(gòu)，傳統(tǒng)的直接功率控制系統(tǒng)是以開關(guān)表為核心，采用電壓外環(huán)，功率內(nèi)環(huán)的結(jié)構(gòu)控制功率開關(guān)管整流，具有結(jié)構(gòu)簡單魯棒性好的優(yōu)點(diǎn)，但是由于采用滯環(huán)比較器和開關(guān)表，使得開關(guān)頻率不固定；針對傳統(tǒng)功率控制的不足，本文研究設(shè)計(jì)了一種預(yù)測直接功率控制策略，并結(jié)合SVPWM調(diào)制技術(shù)使系統(tǒng)不僅具有傳統(tǒng)直接功率控制的優(yōu)點(diǎn)，而且實(shí)現(xiàn)了開關(guān)頻率固定。在并網(wǎng)逆變時(shí)，由于向電網(wǎng)輸送功率因而功率控制更加具有優(yōu)勢，根據(jù)瞬時(shí)功率理論推導(dǎo)出直接功率控制的數(shù)學(xué)模型，并在此基礎(chǔ)上設(shè)計(jì)功率控制器，對其參數(shù)的選擇做出詳細(xì)推導(dǎo)與計(jì)算；設(shè)計(jì)一種功率解耦的控制方法，，結(jié)合SVPWM調(diào)制使得直接功率控制具有單位功率因數(shù)、網(wǎng)側(cè)電流正弦度更好、諧波更低的優(yōu)點(diǎn)。 在Matlab仿真軟件中分別對文中所設(shè)計(jì)的整流和逆變控制策略進(jìn)行仿真實(shí)驗(yàn)并分析其結(jié)果。而后，對20KW小型儲能站PWM變流器的控制系統(tǒng)進(jìn)行硬件和軟件的設(shè)計(jì)，驗(yàn)證控制方法的可行性。
[Abstract]:With the development of society, the demand for energy is higher and higher, and fossil energy is decreasing. In order to use energy reasonably and effectively, energy storage technology has become a hot topic. The storage of electric energy is mainly studied because of the convenience of power production and transmission. The energy storage system can not only reduce the peak load and fill the valley, but also promote the large-scale access of other renewable energy sources, such as solar and wind energy, making energy more convenient and efficient to be used by people. PWM converter is the core part of energy storage system. Its performance directly determines whether the system can operate efficiently and stably. In this paper, the PWM reversible converter in 20 KW small storage station is studied and analyzed. This paper introduces the current research situation of the energy storage station and the research status and development direction of the PWM reversible converter, and expounds the profound social benefits of the research on the PWM converter. The principle of four quadrant operation of PWM converter and the common topology and control strategy of PWM converter are analyzed. Taking the three-phase voltage-source PWM converter as the research object, the mathematical models of the PWM converter in the three-phase stationary coordinate system, the two-phase stationary coordinate system and the two-phase rotating coordinate system are established. On the basis of the mathematical model, the rectifier and inverter of the PWM converter are studied. Based on the concept of instantaneous power, the direct power control strategy of PWM converter is studied and analyzed in this paper. The principle and the system structure of the direct power control strategy are analyzed and studied. The traditional direct power control system is based on the switch table and adopts the structure of voltage outer loop and power inner loop to control the rectifying of the power switch tube. It has the advantage of simple structure and good robustness, but because of the hysteresis comparator and switch table, the switching frequency is not fixed. In view of the shortcomings of traditional power control, a predictive direct power control strategy is designed in this paper. Combined with SVPWM modulation technology, the system not only has the advantages of traditional direct power control, but also realizes the fixed switching frequency. In the grid-connected inverter, the power control has more advantages because of the transmission of power to the grid. According to the instantaneous power theory, the mathematical model of direct power control is derived, and the power controller is designed on this basis. The selection of parameters is deduced and calculated in detail, and a power decoupling control method is designed. Combined with SVPWM modulation, direct power control has the advantages of unit power factor, better sinusoidal current and lower harmonics. In the Matlab simulation software, the simulation experiments and the results of the rectifier and inverter control strategies designed in this paper are carried out respectively. Then, the control system of PWM converter in 20KW small storage station is designed in hardware and software to verify the feasibility of the control method.
【學(xué)位授予單位】：河南科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM46

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本文編號：2052254