本系统由SPWM信号的产生、逆变回路及其控制、欠压过流保护、键盘和显示等部分组成。选择DSP TMS320F28027芯片产生SPWM信号；逆变器主回路是由功率场效应晶体管构成的全桥逆变电路，其控制部分采用基于DSP控制的最大功率跟踪和输出电流跟踪控制策略，使逆变输出电流与参考信号同频同相；并从软硬件两方面进行输入欠压、输出过流保护，增强系统的稳定性和可靠性。对系统的转换效率、畸变率等各项指标的测试结果表明，本光伏并网模拟装置是比较稳定可靠的。(The system consists of SPWM signal generation, inverter circuit and its control, undervoltage over-current protection, keyboard and display and other parts. DSP TMS320F28027 chip select SPWM signal is generated; the inverter main circuit is full bridge inverter circuit is composed of power field effect transistor, the control part adopts DSP to control the maximum power tracking and output current tracking control strategy based on the inverter output current reference signal with the same frequency and phase; and the input voltage, output over-current protection from two aspects of hardware and software, to enhance the stability and reliability of the system. The test results of the system conversion efficiency, distortion rate and other indicators show that the photovoltaic grid connected simulation device is relatively stable and reliable.)