太阳能光伏发电系统_毕业论文

毕 业 论 文

题目 太阳能光伏发电系统

学院 __________江西太阳能科技职业学院___

专业 _________光伏发电技术及应用___ __

摘 要

本系统采用C8051F020为控制核心，实现了模拟太阳能光伏发电系统的功能。该系统主要通过太阳能储蓄电能，通过正弦波脉宽调制技术（SPWM）控制全桥逆变将直流电变为交流电，再经过变压器将电压变为所需的电压。该系统具有最大功率追踪（MPPT），输出电压与给定参考电压频率、相位同步，欠压、过流保护，欠压保护的自动恢复等功能，且具有LCD屏幕显示功能。

关键词： C8051F020 SPWM MPPT 欠压过流保护

Abstract

This system uses C8051F020 simulation of solar photovoltaic power generation system to control the core functions. The system is mainly electricity through the solar savings by sinusoidal pulse width modulation (SPWM) control full-bridge inverter direct current into alternating current, and then through the transformer voltage into the required voltage. The system has the maximum power point tracking (MPPT), output voltage with a given reference voltage frequency and phase synchronization, undervoltage, overcurrent protection, undervoltage protection, automatic recovery, and the LCD screen display

Keywords： C8051F020 SPWM MPPT Under-voltage over-current protection

目 录

前 言.......................................................................................................................... 1 第1章 总体设计方案 ......................................................................................... 3

1.1 DC—AC 逆变驱动方案 .................................................................................. 3 1.2 显示模块的选择 ............................................................................................... 4 1.3 MPPT控制方案 ............................................................................................... 6 1.4 输入电压采集模块 ........................................................................................... 6 1.5 模数转换芯片AD的选择 ............................................................................... 7

第2章 硬件系统的设计 .................................................................................... 8

2.1 系统整体原理框图 ........................................................................................... 8 2.2 系统各模块的设计及参数计算 ....................................................................... 8 2.2.1 控制器......................................................................................................... 8 2.2.2 MPPT的控制方法与参数计算 ............................................................... 10 2.2.3 同频、同相的控制方法与参数计算....................................................... 11 2.2.4 提高效率的方法....................................................................................... 11 2.2.5 滤波参数计算........................................................................................... 12 2.2.6 全桥逆变电路........................................................................................... 12 2.2.7 开关管驱动电路....................................................................................... 13 2.2.8 电压信号调理电路................................................................................... 14 2.2.9 电流信号调理电路................................................................................... 15 2.2.10 显示电路................................................................................................... 16

第3章 系统软件设计 ....................................................................................... 18

3.1 ADC0的使用 ................................................................................................. 20 3.1.1 ADC0使用出现的问题 ......................................................................... 20 3.1.2 ADC0使用注意事项 ............................................................................. 20 3.1.3 ADC0通道输入保护 ............................................................................. 21 3.1.4 ADC0使用总结 ..................................................................................... 21

第4章 系统测试 ................................................................................................ 22

4.1 测试方案与测试结果 ..................................................................................... 22

4.2 测试仪器 ......................................................................................................... 23

结束语........................................................................................................................ 24 谢 辞........................................................................................................................ 25 参考文献 ................................................................................................................... 26