【摘要】：當(dāng)今太陽能成為世界各國大力發(fā)展的一種新能源,太陽能最重要的應(yīng)用領(lǐng)域和研究熱點(diǎn)是光伏發(fā)電。光伏逆變器是光伏發(fā)電中極為重要的一環(huán),對(duì)系統(tǒng)的性能和成本有很大影響。因此,研究逆變器的控制方法對(duì)光伏發(fā)電系統(tǒng)的穩(wěn)定運(yùn)行具有重要意義。本文采用模型預(yù)測(cè)與PI相結(jié)合的控制算法,對(duì)三相離網(wǎng)逆變器的控制策略進(jìn)行了研究。論文的主要工作如下：1、介紹了三相離網(wǎng)逆變器常用的控制方法。包括PIID控制、重復(fù)控制、無差拍控制、模糊控制、滑模變結(jié)構(gòu)控制等,重點(diǎn)對(duì)模型預(yù)測(cè)控制(model predictive control, MPC)算法進(jìn)行了研究,介紹了模型預(yù)測(cè)控制的發(fā)展歷程、基本原理和基本特征,分析了模型預(yù)測(cè)控制的優(yōu)點(diǎn)和存在的問題以及研究現(xiàn)狀。2、對(duì)三相離網(wǎng)逆變器的拓?fù)浣Y(jié)構(gòu)和控制方法進(jìn)行了研究,得到系統(tǒng)的主電路模型以及數(shù)學(xué)模型。3、結(jié)合模型預(yù)測(cè)控制和PI控制各自的優(yōu)缺點(diǎn),采用模型預(yù)測(cè)PI控制方法,即模型預(yù)測(cè)控制與PI控制結(jié)合,該方法可以在線整定PI參數(shù),具有模型預(yù)測(cè)控制的良好性能,改善了控制效果,又能保持與其他控制策略的相容性,兩者的結(jié)合提高了系統(tǒng)的穩(wěn)定性。4、利用Matlab/Simulink軟件對(duì)理論分析的內(nèi)容進(jìn)行了仿真,并搭建了三相離網(wǎng)逆變器實(shí)驗(yàn)裝置,介紹了硬件和軟件的實(shí)現(xiàn)過程,實(shí)現(xiàn)了模型預(yù)測(cè)PI算法,給出了與傳統(tǒng)PI控制的對(duì)比結(jié)果。仿真和實(shí)驗(yàn)驗(yàn)證了模型預(yù)測(cè)PI控制算法的有效性。
[Abstract]:Nowadays, solar energy has become a new energy in the world. The most important application and research hotspot of solar energy is photovoltaic power generation. Photovoltaic inverter is an important part of photovoltaic power generation, which has great influence on the performance and cost of the system. Therefore, it is of great significance to study the control method of inverter for the stable operation of photovoltaic power system. In this paper, the control strategy of three-phase off-grid inverter is studied by the combination of model prediction and PI. The main work of this paper is as follows: 1. The common control methods of three-phase off-grid inverter are introduced. It includes PIID control, repetitive control, deadbeat control, fuzzy control, sliding mode variable structure control and so on. The (model predictive control, MPC) algorithm of model predictive control is mainly studied, and the development course of model predictive control is introduced. The basic principles and characteristics of the model predictive control are analyzed. 2. The topology and control methods of the three-phase off-grid inverter are studied. The main circuit model and mathematical model of the system are obtained. 3. Combining the advantages and disadvantages of model predictive control and PI control, the model predictive PI control method is adopted, which combines model predictive control with PI control, and the PI parameters can be adjusted online by this method. It has good performance of model predictive control, improves the control effect, and maintains the compatibility with other control strategies. The combination of the two improves the stability of the system. 4. The content of theoretical analysis is simulated by Matlab/Simulink software. The experiment device of three-phase off-grid inverter is built, the realization process of hardware and software is introduced, the model prediction PI algorithm is realized, and the comparison results with traditional PI control are given. Simulation and experiment verify the effectiveness of the model predictive PI control algorithm.
【學(xué)位授予單位】：安徽大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TM464

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