摘要：随着全球化石能源的日益消耗，以太阳能为首的清洁型能源慢慢进入人类的生活中。由于太阳能发电有着取之不尽、用之不竭的特点,成为各国大力开发的对象。本文通过设计三相光伏并网逆变器控制系统，来控制逆变器输出端的交流电压与国家电网电压同频同相，避免造成电网污染。

本文从光伏发电的背景与意义及在国内外的发展概况开始论述，引入光伏并网逆变器控制系统的设计。接着介绍电压源式逆变器的主电路拓扑结构，并在此基础上建立三相电压型并网PWM逆变器在静止、旋转坐标系下的数学模型。随后，简述并网逆变器控制策略的控制目标，决定使用电压电流双闭环瞬时控制的控制策略。同时说明了空间矢量脉宽调制法的基本原理和实现流程。最后，通过MATLAB仿真软件，建立仿真模型，得出波形后进行分析，验证本系统的可行性。81814

关键词： 逆变器拓扑；双闭环控制；SVPWM； MATLAB仿真

The Design of Control System for Photovoltaic Grid - connected Inverter

Abstract：With the increasing consumption of global fossil fuels, clean energy led by solar energy slowly moves into human’s life。 Because the solar energy has been inexhaustible in supply and always available for use, it becomes the main object of development among global world。 In this paper, through the design of three-phase photovoltaic grid-connected inverter control system, the inverter can control its output voltage the same frequency as the national grid voltage in phase, in order to avoid Grid pollution。 

This paper discusses the purpose and significance of the issue, and the development of photovoltaic power generation at home and abroad。 Then the issue introduces the main circuit topology of the inverter with the voltage source。 On this basis, the mathematical model of the three-phase voltage-type grid-connected PWM inverter not only in the stationary coordinate

system but also in the rotating coordinate system is established。 After all, the control aim about the control strategy controling the grid-connected inverter is briefly described, and the control strategy of the double-closed-loop transient control using voltage and current is decided to be used。 At the same time, the basic principle and realization flow of space vector pulse width modulation method are explained。 Finally, through the MATLAB simulation software, the simulation model is established, and the waveform is analyzed and the feasibility of the system is verified。

Key words:  inverter topology; double closed-loop control; SVPWM; MATLAB simulation

目录

1 绪论 1

1。1 课题的背景与意义 1

1。2 光伏产业在国内外的发展概况及趋势 1

1。2。1 国外的光伏产业发展概况 1

1。2。2 国内的光伏产业发展概况 2

1。3 光伏并网发电系统 3

1。4 本文的主要内容 4

2 三相光伏逆变器主电路的拓扑结构及其数学模型 5

2。1 三相电压型并网逆变器的拓扑结构 5

2。2 三相光伏逆变器的数学模型 6

2。2。1 三相静止坐标下的数学模型 6

2。2。2 两相静止坐标下的数学模型 7

2。2。3 两相旋转坐标下的数学模型 8