【摘要】：太陽能發(fā)電作為一種新能源發(fā)電具有很大的優(yōu)勢。其具有工作無噪聲，便于小型化安裝，適合貼近居民區(qū)安裝等優(yōu)勢，因此得到了快速的發(fā)展。課題以太陽能發(fā)電為背景，研究了應(yīng)用于太陽能發(fā)電的Z源并網(wǎng)逆變器的新型控制算法。通過分析Z源并網(wǎng)逆變器的發(fā)展現(xiàn)狀，研究目前Z源并網(wǎng)逆變器控制策略的不足，分析能量成型控制策略的優(yōu)勢，結(jié)合Z源并網(wǎng)逆變器應(yīng)用于光伏發(fā)電的特點(diǎn)，提出了采用能量成型控制策略進(jìn)行Z源并網(wǎng)逆變器控制的研究。 首先，對Z源逆變器的升壓原理進(jìn)行了闡述，詳細(xì)分析了應(yīng)用于Z源逆變器控制的三種升壓調(diào)制策略，并結(jié)合SVPWM逆變調(diào)制方式將三種升壓調(diào)制策略以直通時間的形式注入到SVPWM調(diào)制信號中。 其次，對Z源并網(wǎng)逆變器的傳統(tǒng)PI控制進(jìn)行了研究。采用基于并網(wǎng)電流閉環(huán)的控制策略，分析了其并網(wǎng)控制的控制特性，，通過調(diào)節(jié)PI參數(shù)，可以使系統(tǒng)達(dá)到預(yù)期的控制目標(biāo)；進(jìn)一步分析了其孤島運(yùn)行狀態(tài)，采用基于輸出電壓閉環(huán)的控制，可以使Z源并網(wǎng)逆變器工作于孤島模式；在其并網(wǎng)和孤島的切換中提出了修正調(diào)制信號控制和給定電流漸增控制，減小切換沖擊。在PI控制中，總結(jié)了其不足，為能量成型控制器的提出奠定了基礎(chǔ)。 然后，通過分析能量成型控制策略的理論基礎(chǔ)，結(jié)合Z源并網(wǎng)逆變器的特性，建立了其綜合的端口受控哈密頓（PCH）模型。在PCH模型的基礎(chǔ)上通過阻尼注入和互聯(lián)矩陣的設(shè)計(jì)方法設(shè)計(jì)了Z源并網(wǎng)逆變器的能量成型控制器。通過仿真驗(yàn)證了控制器設(shè)計(jì)的正確性。在以上研究基礎(chǔ)上，通過比較Z源并網(wǎng)逆變器的PI控制和能量成型控制得出了采用兩種控制方法各自的優(yōu)缺點(diǎn)。Z源并網(wǎng)逆變器的PI控制存在PI參數(shù)的調(diào)整費(fèi)時耗力，且PI控制魯棒性較差，經(jīng)常出現(xiàn)輸出飽和或振蕩的情況，而能量成型控制器的參數(shù)可以通過數(shù)學(xué)模型計(jì)算得到，不需反復(fù)的試湊，且具有較好的魯棒性。 最后，通過建立光伏電池的仿真模型分析了其輸出特性，對應(yīng)用于光伏發(fā)電的MPPT控制策略進(jìn)行了分析，在此基礎(chǔ)上，結(jié)合能量成型控制器，將MPPT控制算法以差分方程的形式嵌入到能量成型控制器中，建立了采用能量成型控制算法的光伏發(fā)電Z源并網(wǎng)逆變器綜合的控制器。系統(tǒng)整體的仿真結(jié)果證實(shí)了控制的有效性。
[Abstract]:Solar power generation as a new energy generation has great advantages. It has the advantages of no noise, miniaturization and close to residential area, so it has been developed rapidly. Based on the background of solar power generation, a new control algorithm of Z source grid-connected inverter for solar power generation is studied. Based on the analysis of the development of Z-source grid-connected inverter, the deficiency of current Z-source grid-connected inverter control strategy is studied, and the advantages of energy shaping control strategy are analyzed. The characteristics of Z-source grid-connected inverter applied in photovoltaic power generation are analyzed. The study of Z-source grid-connected inverter control using energy forming control strategy is presented. Firstly, the booster principle of Z-source inverter is described, and three kinds of boost modulation strategies are analyzed in detail. Combined with SVPWM inverter modulation, three boost modulation strategies are injected into the SVPWM modulation signal in the form of through time. Secondly, the traditional PI control of Z source grid-connected inverter is studied. Based on the closed-loop control strategy of grid-connected current, the control characteristics of grid-connected control are analyzed. By adjusting the parameters of PI, the desired control objectives can be achieved. Furthermore, the islanding operation state is analyzed, and the Z source grid-connected inverter can work in the isolated island mode by using the closed-loop control based on the output voltage. In the switching between grid-connected and islanding, modified modulation signal control and given current increasing control are proposed to reduce the switching impact. The deficiency of PI control is summarized, which lays a foundation for the development of energy forming controller. Then, by analyzing the theoretical basis of the energy shaping control strategy and combining the characteristics of Z-source grid-connected inverter, a comprehensive port controlled Hamiltonian (PCH) model is established. Based on the PCH model, the energy shaping controller of Z-source grid-connected inverter is designed by means of damping injection and interconnection matrix design. The correctness of the controller design is verified by simulation. On the basis of the above research, the advantages and disadvantages of the two control methods are obtained by comparing the PI control of Z-source grid-connected inverter and the control of energy shaping. The PI control of Z-source grid-connected inverter has the time-consuming and time-consuming adjustment of PI parameters. Moreover, the robustness of PI control is poor, the output saturation or oscillation often occurs, and the parameters of the energy forming controller can be calculated by mathematical model, without repeated trial and error, and have good robustness. Finally, the output characteristics of photovoltaic cell are analyzed by establishing the simulation model, and the MPPT control strategy applied to photovoltaic power generation is analyzed. On this basis, the controller is combined with the energy forming controller. The MPPT control algorithm is embedded in the energy forming controller in the form of difference equation, and the integrated controller of the photovoltaic Z-source grid-connected inverter using the energy shaping control algorithm is established. The simulation results of the whole system verify the effectiveness of the control.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM464

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