本文關(guān)鍵詞： 光伏并網(wǎng)逆變器 智能功率模塊 雙閉環(huán)PI控制 粒子群優(yōu)化 空間矢量調(diào)制　出處：《廣西大學(xué)》2014年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：光伏并網(wǎng)逆變器作為能量轉(zhuǎn)換與實(shí)時(shí)控制的關(guān)鍵裝置,在提高并網(wǎng)電流質(zhì)量及系統(tǒng)安全性等方面發(fā)揮著至關(guān)重要的作用。迄今為止,人們已對(duì)太陽(yáng)能光伏逆變器進(jìn)行了廣泛的研究,但仍有許多問(wèn)題有待進(jìn)一步研究。本文在研究光伏并網(wǎng)逆變器電流控制策略基礎(chǔ)上,對(duì)系統(tǒng)控制參數(shù)的優(yōu)化進(jìn)行了深入的研究。論文主要的工作如下： 1.光伏并網(wǎng)逆變器控制策略的研究。第一,通過(guò)分析光伏并網(wǎng)逆變器的拓?fù)浣Y(jié)構(gòu),從而確定系統(tǒng)的主電路拓?fù)�；第�?結(jié)合主電路的拓?fù)?分析光伏并網(wǎng)逆變器的工作原理,并推導(dǎo)光伏并網(wǎng)逆變器的數(shù)學(xué)模型；第三,根據(jù)數(shù)學(xué)模型,設(shè)計(jì)基于電壓定向的雙閉環(huán)空間矢量調(diào)制算法；最后,采用一種改進(jìn)的粒子群算法離線優(yōu)化光伏逆變器電壓外環(huán)的PI參數(shù)。 2.控制策略的仿真研究。在MATLAB/Simulink里搭建系統(tǒng)仿真模型以及編寫(xiě)離線PSO程序,對(duì)所設(shè)計(jì)的雙閉環(huán)空間矢量控制模型及離線粒子群優(yōu)化方法進(jìn)行仿真,并與未優(yōu)化PI參數(shù)的系統(tǒng)進(jìn)行對(duì)比分析,從而驗(yàn)證控制策略的可行性。 3.完成了系統(tǒng)的軟硬件設(shè)計(jì)。硬件系統(tǒng)由主電路、控制電路、輔助電路組成。其中,主電路采用智能功率模塊,控制電路包括DSP核心電路、電壓電流采樣調(diào)理電路以及電壓過(guò)零點(diǎn)比較電路等。輔助電路是控制系統(tǒng)的電源電路。軟件設(shè)計(jì)包括系統(tǒng)的主程序、鎖相程序、ADC采樣程序、中斷程序、SVPWM程序等。 4.設(shè)計(jì)并制作了1臺(tái)基于DSP2812的20kW實(shí)驗(yàn)樣機(jī),搭建了基于這一樣機(jī)的實(shí)驗(yàn)平臺(tái),并分別進(jìn)行了1.9kW、3.5kW、15kW的系統(tǒng)實(shí)驗(yàn)。研究結(jié)果表明,采用本文所提出控制算法設(shè)計(jì)的逆變器能將光伏陣列輸出的直流電能快速、高效的變換成符合電網(wǎng)要求的交流電能,并能在一定干擾下穩(wěn)定運(yùn)行,從而驗(yàn)證了所采用控制策略的可行性。
[Abstract]:As a key device for energy conversion and real-time control, photovoltaic grid-connected inverter plays an important role in improving the quality of grid-connected current and system safety. Solar photovoltaic inverter has been widely studied, but there are still many problems to be further studied. In this paper, the current control strategy of photovoltaic grid-connected inverter is studied. The optimization of system control parameters is studied deeply. The main work of this paper is as follows:. 1. Research on the control strategy of grid-connected photovoltaic inverter. Firstly, the topology of the main circuit is determined by analyzing the topology of the grid-connected photovoltaic inverter; second, the working principle of the grid-connected photovoltaic inverter is analyzed in combination with the topology of the main circuit. The mathematical model of photovoltaic grid-connected inverter is deduced. Thirdly, based on the mathematical model, a double-closed loop space vector modulation algorithm based on voltage orientation is designed. An improved particle swarm optimization (PSO) algorithm is used to optimize the Pi parameters of the voltage outer loop of photovoltaic inverter. 2. Simulation study of control strategy. The system simulation model and off-line PSO program are built in MATLAB/Simulink, and the double closed loop space vector control model and off-line particle swarm optimization method are simulated. The feasibility of the control strategy is verified by comparison and analysis with the system without optimizing Pi parameters. 3. The hardware and software design of the system is completed. The hardware system is composed of main circuit, control circuit and auxiliary circuit. The main circuit adopts intelligent power module, and the control circuit includes DSP core circuit. The auxiliary circuit is the power supply circuit of the control system. The software design includes the main program of the system, the phase locking program, the ADC sampling program, the interrupt program and the SVPWM program, etc. 4. A 20kW experimental prototype based on DSP2812 is designed and made, and the experimental platform based on this prototype is built, and the system experiment of 1.9kW / 3.5kW / 15kW is carried out respectively. The results show that, The inverter designed by the control algorithm proposed in this paper can transform the output DC energy of photovoltaic array quickly and efficiently into AC energy which meets the requirements of power grid, and can operate stably under certain interference. The feasibility of the control strategy is verified.
【學(xué)位授予單位】：廣西大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TM464

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