基于ARM7的光伏并网发电模拟系统设计与实现

Design and Implement of Photovoltaic Grid-connected Power Simulation Systembase on ARM7

设计了一种采用单级DC-AC+工频变压器的拓扑结构,主电路为IR2110驱动的半桥式逆变电路。控制电路以NXP公司ARM7核心处理器LPC2148,由软件生成SPWM波控制DC-AC逆变。系统通过反馈信号监测频率、相位,经由A/D采样欠压、过流信号,控制频率、相位的跟踪和欠压、过流保护,并且在此系统之上提出了一种创新的测量频率与相位的方法。经测试,本系统的变换效率高。输出正弦波形失真度小,实现了同频同相的跟踪控制和过流欠压保护。

The topology of single-stage DC-AC＋ power frequency transformer is used in this system,the main circuit is half-bridge inverter circuit driven by integrated circuit IR 2110.ARM core microcontroller LPC2148 is the core of the control circuit,and the DC-AC inverter is controlled by the SPWM wave which is generated by software.Through the frequency and phase being monitored by the feedback signal,and A/D sampling being employed by the under-voltage and over-current signal,frequency and phase tracking and under-voltage and over-current protection are controlled by the system,and a novel measurement of frequency and phase was presented.By testing,the conversion efficiency of this system is high and the distortion of output sine-wave is small,the same frequency and phase control can be achieved,as well as the function of under-voltage and over-current protection.