本文關(guān)鍵詞： 光伏發(fā)電 PWM逆變器 非線性系統(tǒng) 能量成形 PCH　出處：《青島大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：目前發(fā)展清潔可持續(xù)的太陽能是能有效應(yīng)對能源與環(huán)境問題的重要方式之一。光伏發(fā)電作為利用太陽能的主要的途徑之一獲得人們的重視并得到大力的發(fā)展。逆變器是使得光伏發(fā)電系統(tǒng)能夠?qū)崿F(xiàn)給負(fù)載供電或者并網(wǎng)功能的重要器件,其性能對整個發(fā)電系統(tǒng)有著極為重要的影響。電壓型三相PWM逆變器在光伏發(fā)電系統(tǒng)的研究和設(shè)計中有較多的應(yīng)用,然而該種逆變器是一個耦合的非線性系統(tǒng),傳統(tǒng)的控制方法的思路是設(shè)計傳遞函數(shù),參數(shù)整定過于復(fù)雜且控制效果不佳。近來,端口受控哈密頓(port-controlled Hamilton,PCH)控制理論日愈受到人們的關(guān)注,其依據(jù)能量成形的控制方法,并能夠很好地解決非線性系統(tǒng)的控制問題。對于逆變器的控制,其優(yōu)點是參數(shù)設(shè)計的物理意義明確且簡易、無需對系統(tǒng)解耦以及穩(wěn)定性分析簡單。本文主要是對適用于光伏發(fā)電中的逆變器的PCH控制方法進(jìn)行相關(guān)的研究。(1)首先闡述了發(fā)展光伏發(fā)電及研究適用于光伏發(fā)電的逆變器的重要意義,然后對光伏發(fā)電系統(tǒng)進(jìn)行了介紹,隨后著重介紹了與逆變器相關(guān)的控制理論及其優(yōu)點與不足從而引出了PCH控制方法,并進(jìn)一步介紹了PCH的研究現(xiàn)狀和控制思路。(2)分別建立了獨立運行的三相逆變器分別在三相靜止以及兩相旋轉(zhuǎn)坐標(biāo)系下的普通數(shù)學(xué)模型。根據(jù)PCH理論并結(jié)合普通數(shù)學(xué)模型建立了獨立運行逆變器的PCH模型,給出了獨立運行逆變器的PCH控制器并給出具體的設(shè)計思路,并最終依據(jù)仿真實驗的結(jié)果驗證了獨立運行光伏逆變器的PCH控制的優(yōu)良性能。(3)在對并網(wǎng)光伏逆變器的控制研究中,首先確定了直接電流控制的控制方法,將PCH控制理論與直接電流控制方法相結(jié)合,從而設(shè)計了并網(wǎng)型三相逆變器的PCH控制器并給出了具體的設(shè)計思路。通過分析仿真實驗的結(jié)果從而驗證了PCH控制在并網(wǎng)逆變器控制中的性能。為了進(jìn)一步驗證PCH控制的性能,在相同實驗條件下與傳統(tǒng)的VOC(voltage oriented control)矢量控制進(jìn)行對比。(4)在并網(wǎng)逆變器的PCH控制的基礎(chǔ)上進(jìn)行了兩個方面的擴展。一是設(shè)計了帶有升壓功能的并網(wǎng)逆變器的整體PCH控制器并通過仿真實驗進(jìn)行驗證,解決了直流側(cè)輸入電壓較低不能完成逆變的問題。二是進(jìn)行了對含光伏電池的動態(tài)光伏逆變系統(tǒng)進(jìn)行復(fù)合PCH控制的研究,提出了一種結(jié)合PCH控制,PI(proportion integration)控制以及最大功率點跟蹤控制的控制思路來共同控制兩級式的光伏發(fā)電系統(tǒng)。最終依據(jù)仿真實驗的結(jié)果驗證了PCH控制在動態(tài)的兩級式的光伏發(fā)電系統(tǒng)中的可行性及其優(yōu)良的性能。論文最后對本論文中所做的工作和不足之處進(jìn)行了總結(jié),并指出未來需要改進(jìn)并研究的工作。
[Abstract]:At present, the development of clean and sustainable solar energy is one of the important ways to effectively deal with energy and environment problems. Photovoltaic power generation as one of the main ways to use solar energy has been paid attention to and developed vigorously. Transformer is an important device that enables photovoltaic power generation system to supply power to the load or connect to the grid. Its performance is very important to the whole power generation system. Voltage source three-phase PWM inverter has many applications in the research and design of photovoltaic power generation system. However, this kind of inverter is a coupling nonlinear system, the traditional control method is to design transfer function, the parameter tuning is too complex and the control effect is not good. Port controlled Hamiltonian Hamiltonian (PCH) control theory has attracted more and more attention, and it is based on the control method of energy forming. And it can solve the control problem of nonlinear system very well. For the control of inverter, its advantage is that the physical meaning of parameter design is clear and simple. There is no need to decouple the system and the stability analysis is simple. This paper mainly focuses on the research of PCH control method suitable for photovoltaic inverter. Firstly, the importance of developing photovoltaic power generation and studying the inverter suitable for photovoltaic power generation is expounded. Then the photovoltaic power generation system is introduced, and then the control theory related to the inverter and its advantages and disadvantages are emphatically introduced, which leads to the PCH control method. Furthermore, the research status and control ideas of PCH are introduced. The general mathematical models of independent three-phase inverter in three-phase static and two-phase rotating coordinate system are established respectively. According to PCH theory and combined with common mathematical model, the PCH of independent operation inverter is established. Model. The PCH controller of independent operation inverter is given and the design idea is given. Finally, according to the results of simulation experiments, the excellent performance of PCH control of independently running photovoltaic inverter is verified in the research of grid-connected photovoltaic inverter control. Firstly, the direct current control method is determined, and the PCH control theory is combined with the direct current control method. The PCH controller of grid-connected three-phase inverter is designed and the concrete design idea is given. The performance of PCH control in grid-connected inverter is verified by analyzing the simulation results. Step to verify the performance of PCH control. Comparing with traditional VOC(voltage oriented control vector control under the same experimental conditions. Based on the PCH control of grid-connected inverter, two aspects are extended. One is to design a PCH controller of grid-connected inverter with boost function and verify it by simulation experiment. It solves the problem that low input voltage on DC side can not complete the inverter. Second, the research of compound PCH control for dynamic photovoltaic inverter system with photovoltaic cells is carried out, and a kind of combined PCH control is proposed. PI(proportion integration). The control ideas of control and maximum power point tracking control are used to control the two-stage photovoltaic power generation system. Finally, the feasibility of PCH control in dynamic two-stage photovoltaic power generation system is verified by the simulation results. Finally, the paper summarizes the work and shortcomings of this paper. It also points out the work that needs to be improved and studied in the future.
【學(xué)位授予單位】：青島大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM615;TM464

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