《模拟太阳能电源并网电路与控制部分硬件设计》-毕业论文.doc

模拟太阳能电源并网电路与控制部分硬件设计 摘 要 太阳能作为一种高效无污染的新能源，一种未来世纪常规能源的替代品。目前，太阳能并网发电是太阳能光伏的重要应用之一，其系统包括光伏电池、变换器、蓄电池、控制器四大部分。该设计从实验的角度，对光伏并网发电系统进行模拟，主要由DC—AC变换电路、控制电路、驱动保护电路、采样电路、工频变换电路等五部分组成。基本思路是在单片机C8051F020控制作用下采用正弦波脉宽调制技术（SPWM）对系统进行控制，主电路采用MOSFET为主要元器件的单相桥式逆变电路，经滤波电路滤波后变压进行输出。基于此，本设计采用单片机本身的PCA模块，定时器模块，完成相应的控制功能，使光伏发电频率紧跟模拟电网频率，同时实现光伏最大功率跟踪，系统具有欠压保护、过流保护以及频率和相位跟踪等功能，并在欠压、过流故障排除或能自动恢复正常状态。该系统性能相对稳定，能够满足本次设计的需要。 关键词：光伏并网 DC—AC逆变电路 SPWM 最大功率点跟踪 The Hardware Design Of Solar Power Combined To The Grid And Controled Abstract Solar energy as the one kind of efficient pollution-free new energy, a future century of conventional energy sources substitutes. At present, the solar energy grid generation is one of the important application of solar photovoltaic battery, the system includes, converter, batteries, controller four most. This design, from the point of view of experiment of photovoltaic (pv) grid power system is simulated by DC-AC conversion - main circuit, controlling circuit, drive protection circuit, sampling circuit, industrial frequency transform circuit composed to five parts. The basic idea is C8051F020 SCM control action in the sine pulse-width modulation technology (SPWM) the system is controlled, main circuit adopts MOSFET as the main components of single-phase bridge type inverter circuits, the filter circuit for output variable pressure filtered. Based on this, this design USES the microcontroller itself, timer modules of PCA module, completing the corresponding control function, make photovoltaic power frequency follows grid frequency, but also achieve simulated photovoltaic maximum power tracking, system has low voltage protection, over-current protection and frequency and phase tracking, etc., and in less pressure, flow troubleshooting or can automatically resume normal state. This system performance relative stability, can satisfy the need of this design. Keywords: photovoltaic (pv) grid DC - AC inverter circuits SPWM maximum power point tracking 目录 TOC