摘要
在分布式发电并网发电系统中,需要对并网电流进行控制并达到输出功率因数为1的目的。分析了4种常用的输出电流控制方法,比较了其优缺点。针对并网逆变器功率开关频率较高、并网电流谐波总畸变率过大的问题,提出了一种改进的正弦电流滞环宽度控制方法。该法具有倍频控制效果,可以减少功率开关管的损耗,提高系统的稳定性;在降低输出系统电流谐波方面,有利于提高系统的稳定性和运行效率。
In the distributed generation system, the grid-connected current need to control for ensuring the power factor 1. This paper compares and analyzes four existing current control methods,points out their advantages and weaknesses. In order to solve the problems of higher switching frequency and bigger total harmonic distortion of system current, this paper proposes a new current control method with three-level hysteresis-band sine current control. The control method makes frequency doubling, reduces switching frequency and ameliorate total harmonic distortion of system current, which is helpful to improve the stabilization and efficiency of grid-connected operating.
出处
《电网与清洁能源》
2008年第11期16-19,共4页
Power System and Clean Energy
关键词
分布式发电
电流控制
开关频率
谐波总畸变率
distributed generation
current control
switching frequency
total harmonic distortion
