摘要
提出了一种新型分布式控制方法来实现单相数字模块化UPS(不停电电源)的并联运行。各个并联的UPS模块完全相同,实现了真正的冗余。通过电压基准相位线实现各UPS输出电压的同步,采用平均电流法实现各UPS模块的均流。并在三台1kVA在线式UPS上进行了仿真和实验研究。结果表明该方案简单可行,均流控制的动态响应速度快,精度高。
A novel distributed control scheme is proposed for the parallel operation of single phase digital controlled UPS (uninterrupted power supply). In this scheme, all the UPS modules that are interconnected only by two common lines are exactly the same.So the real redundancy is achieved. One of the two common lines provides a cycle waveform. Each reference voltage of the paralleled UPS traces the cycle waveform in order to synchronize the output voltages. The other is for averaged output current and current sharing is achieved by average current method. Both two common lines are low pass lines in order to restrain the possible electromagnetic interference. Simulation and experiments are carried out to verify the control scheme with three 1kVA online UPS modules and the results show that the control scheme is simple and feasible, the current sharing is precise in dynamic response and static state, and the parallel system is insensitive to noise.
出处
《电工电能新技术》
CSCD
2003年第4期17-20,24,共5页
Advanced Technology of Electrical Engineering and Energy
关键词
不停电电源
并联
分布式控制
均流
UPS
parallel
distributed control
current sharing
