逆变器基于电阻采样的直流分量调节电路分析

DC Component Regulating Circuit Analysis of Inverter Based on Resistance Sampling

光伏逆变器输出直流分量的大小是衡量其品质的重要参数之一,国内光伏逆变器厂商主要采用电流传感器采样并传送到数字信号处理器(DSP)控制的方式来实现光伏逆变器输出的直流分量控制。介绍了一种新颖的电路,通过电阻采样信号的方式来实现直流分量的控制,其主要包括信号采样电路、直流分量提取和放大电路、信号隔离电路、直流分量调节等部分。此电路很好地避免了使用电流传感器采样存在的初始偏移量导致直流分量控制精度不高的问题,实验测试取得了很好的效果,且成本要远低于传统的电流传感器采样电路。

The value of the photovoltaic inverter output DC component is one of the important parameters to measure the quality of the inverter.The domestic photovoltaic inverter manufacturers mainly use the current sensor sampling and send to digital signal processing（DSP） to control the DC component of photovohaic inverter output.A new circuit is introduced to realize the control of the DC component through the resistor sampling.h does not have an initial off- set problem relative to current sensor sampling circuit.The test results are very well and the cost is lower.