【作者】 欧阳超；

【导师】 王明彦；

【作者基本信息】 哈尔滨工业大学 ， 电气工程， 2009， 硕士

【摘要】 随着世界各国面临的能源危机和环境污染越来越严重,可再生能源的利用也越来越受到人们的重视,太阳能光伏发电是可再生能源利用的一个很重要的研究方向,本文就是基于这种情况对太阳能光伏并网系统进行了理论、仿真和实验研究。论文首先对单模块光伏并网系统的各种常用拓扑进行了比较,选择了两级式光伏并网拓扑作为研究对象。又因为太阳能电池的输出电压比较低,不能满足后级逆变器的要求,因此选择了三种高升压比DC-DC升压电路进行研究,对其进行了工作原理分析和仿真实验,提出了一种应用高升压比DC-DC电路的单模块两级式光伏并网拓扑,并且介绍了基于高升压比DC-DC电路的最大功率点跟踪控制。对单模块两级式光伏并网系统进行了理论研究,分别对应用单电感滤波和LCL滤波的并网逆变器进行了数学建模、理论分析和应用Matlab/Simulink软件的仿真实验。对应用电网电压前馈控制方法的闭环控制策略进行了研究,并且介绍了闭环系统控制参数的整定方法。最后对应用高升压比DC-DC电路的两级式光伏并网系统进行了仿真。针对太阳能光伏电站等集中式光伏发电系统,单模块光伏并网系统不能满足功率要求,因此本文提出了几种多单元光伏并网系统拓扑,包括电压型等幅和不等幅多电平叠加、电流型等幅和不等幅多电平叠加,对它们进行了理论分析和仿真研究,并且对提出的几种多单元拓扑进行了横向比较。同时对另一种多单元拓扑SPWM并联方法进行了理论和仿真研究。本文还对应用高升压比DC-DC电路的多单元光伏并网系统进行了硬件和软件设计,其中硬件电路包括功率主电路、控制电路、驱动电路、检测电路等;软件包括SPWM产生、锁相环等。论文最后对设计的单模块光伏并网系统进行了实验验证,得出的实验波形验证了理论分析和仿真实验的正确性和有效性,同时对实验中取得的调试经验进行了总结。更多还原

【Abstract】 Because of the worldwide energy crisis and environmental pollution, renewable energy sources have been paid more attention. Solar photovoltaic power generation is one of the most important fields. This paper mainly focuses on theories, simulation and experimentation of grid-connected photovoltaic power system.First, several common single-module photovoltaic topologies are compared and the two-staged photovoltaic system is chosen for the study due to its advantages. But because the output voltage of solar cells is relatively low and therefore can not meet the need of the inverter, three different high step-up DC-DC converters are selected for further study. After analyzing of the principle and simulation results, a two-stage photovoltaic system which applies a high step-up DC-DC converter is present in this paper. Then, a method of the maximum power point tracking control on the high step-up DC-DC converter is introduced.Next, more theoretical research, which includes theoretical analysis and mathematic model of both grid-connected inverter with LCL flitter and single-inductor filter, focuses on the two-stage grid-connected photovoltaic system and is proved by Matlab/Simulink simulation. Also, this paper studies the closed-loop control strategy for the grid-connected inverters and applies the grid voltage forward feed control method. Then, a method of tuning parameters of closed-loop system control is introduced. The simulation of two-stage grid-connected photovoltaic system using high step-up DC-DC converter was presented.Because single-module photovoltaic systems topology can not meet the power requirements of centralized photovoltaic power generation systems, such as solar PV power station, this paper presented several multi-cell PV system topologies including equal amplitude superposition and unequal amplitude superposition of voltage-source inverters and current-source inverters. Their working principles are analyzed and proved by simulation. A comparison on these multi-cell PV systems is presented as well. Another multi-cell topological by using SPWM control is studied and simulated in the paper.Finally, this paper designs the hardware including power circuit, control circuit, drive circuit, detection circuit, and software including SPWM generation and phase-locked loop. Experiment proves the theoretical analysis and simulation of the single-module grid-connected photovoltaic systems. Some experience in the debugging is summarized.更多还原