中文摘要：

介绍了一种基于直流母线的串联型光伏效率优化器并网发电系统，该系统能够在局部阴影或热斑的情况下，提高系统输出功率。每台效率优化器有升压、降压、直通三种模式，对接入的光伏板使用扰动观察法进行最大功率点追踪。逆变器使用双环控制，电压外环稳定直流母线电压，电流内环控制并网输出电流。该系统有完善的通讯和保护机制可以使系统各模块间协同工作，出现故障时及时停止工作。仿真和实验结果证明了该系统能够可靠稳定的工作。

英文摘要：

This paper introduces a series-connected optimizer system for photovoltaic applications which based on DC-Bus.This system will improve eflaciency of the PV panels in the situation of partial shde or hot spot.Each optimizer has three modes which are step-up,step-down and pass through ,each optimizer tracks the max power point of the PV panels connected to it.Inverter is controlled with double loop,the voltage loop stabilizes the voltage of DC-Bus,the current loop regulates the output current.This system has reliable communication and protection.Simulation and experiment has testified reliability of the system.