光伏并网发电毕业设计

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1、 I 摘 要 随着社会的发展， 人类对电能的需求已经不可或缺， 人类使用各种能源转化成电能。 太阳能光伏以其清洁，取之不竭而受到各国能源专家的追捧，尤其是光伏发电的并网运 行是各国研究的热门技术。在此，设计一个逆变并网模拟系统的软件部分。逆变并网模 拟系统主要由直流稳压电源、逆变电路、滤波电路、检测及保护电路、控制系统组成。 系统由主控 W77E58 单片机产生正弦波与三角波比较得到 SPWM 波来驱动桥式逆变电 路,将直流电逆变为符合并网要求的电压，经滤波送入市电电网；另一方面，检测回路 的检测信号经 MAX197 模数转换后输入 W77E58 单片机控制核心，经数据处理后实现 并网运行，过

2、流欠压保护等功能；此外，通过采集逆变交流侧电压的频率与模拟并网侧 标准频率信号送入主控单片机，比较后实现频率相位跟踪。所以软件包括正弦波产生程 序、频率相位跟踪程序和过流欠压保护等部分。 关键词：脉宽调制，逆变电路，频率相位跟踪，W77E58 单片机，MAX197 II the Software Design of Grid-connected Inverter Power-producing Emulation System ABSTRACT Along with the social development, the mankinds need to the energy is indis

3、pensable. Humans turn various energy resources into electric power. As one of the green renewable and limitless energy, the solar has been appreciated by expert from energy in all countries. And the research for the net movement of the grid-connected photovoltaic inverter generating electricity is a

4、 popular technique in all countries. In this article, the software part of grid-connected inverter power-producing emulation system is introduced. The system has direct current of battery , Inverter circuits and filter circuit, testing and protection circuit and control system. W77E58 is the control

5、 chip of the system. W77E58 creates the sine wave. Comparing the sine wave and triangle wave gets SPWM wave. SPWM wave drives bridge type inverter circuit which changes the direct current of battery into electric voltage that meets nets request. And going through filter ,the electric voltage is sent

6、 into utility grid; On the other hand, the examination signal of feedback back tracks through MAX197.MAX197 puts the signal to W77E58.After data processing , the system carry out parallel operation, over-current and owe voltage protection. In addition, according to the acquisition of ac voltage inverter frequency and simulation grid side standard frequency signals, the system carry out frequency and phase tracking. The software includes the part of sine wave, frequency phase tracking and ove