康 怡,杨鲁发

摘 要:为了降低光伏并网逆变器的复杂性,提高系统的可靠性,可以将IPM智能功率模块PM50B4LB060应用到光伏并网逆变电路中,由于其内部有驱动和保护电路,开关控制信号的产生电路输入端直接与光耦相连,光耦的输出可以直接输入IPM模块,控制IPM内部开关管的开合,实现逆变功能,光耦起隔离作用。介绍光伏逆变器和逆变电路原理,给出了开关控制信号波形和输出电压仿真波形。与其他逆变电路相比,减少了外围元器件,提高了系统可靠性。

关键词:光伏并网;逆变器;IPM;SPWM

中图分类号:TM464;TP274 文献标识码:B 文章编号:1004-373X(2009)20-209-03

Application of IPM on Photovoltaic Grid-connected Inverter

KANG Yi,YANG Lufa

(North China Electric Power University,Baoding,071003,China)

Abstract:In order to reduce complexity of the photovoltaic grid-connected of inverter,and improve system reliability,the IPM intelligent power module PM50b41b060 can be used for the inverter circuit,because of its internal drive and protective circuit,switch control input signal generator circuit connected directly with the optocoupler.The optocoupler output can directly enter the IPM module,control the internal switch of IPM within the opening and closing,implementing the inverter function.The optocoupler isolate from the circuit of control to the inverter.The photovoltaic inverters and inverter circuit principle are introduced,the switch control signal waveform and output voltage simulation waveform are given.Compared to other inverter circuit,it decreases the external components,and improves reliability of the system.

Keywords:PV grid-connected;inverter;IPM;SPWM

0 引 言

随着现代社会对能源需求的不断增加而传统能源的供应不断枯竭,研究利用太阳能、风能等可再生能源的分布式发电系统具有重要意义[1]。并网逆变器是并网发电系统的核心部件和技术关键[2]。光伏并网逆变器一般采用单独的MOSFET或IGBT作为功率开关,由于需要设计驱动电路和保护电路,增加了系统的复杂性,降低了系统的可靠性。因而IPM的出现使得设计出简单和高效的电路成为可能。

IPM(Intelligent Power Modules)是用IGBT作为功率开关,内部同时集成驱动电路、过压保护电路、过流保护电路、过热保护电路、欠压保护电路以及检测电路,由于其外部接线和焊点减少,使得可靠性明显增加[3,4]。IPM的自保护能力降低了器件在开发和使用过程中损坏的机率。当其中任何一种保护动作时,IGBT栅极驱动单元就会被关闭,并输出一个故障信号。IPM的出现使电力电子变流器的高频化、小型化、高可靠性和高性能成为可能,同时减少了开发时间。……