基于异步变频调制的UPS逆变数字锁相技术

针对不间断电源(UninterruptedPowerSupply,UPS)控制的数字化趋势,提出了一种应用于数字化UPS的逆变锁相控制技术。与其它数字锁相技术不同的是,该技术基于一种可变频的异步调制算法。该算法具有精度高、程序实现简单、易于对逆变输出进行变频/移相控制等众多优点,再结合市电/逆变输出的相位反馈逻辑,即可实现UPS逆变与市电的同频同相输出。实验证明,该数字锁相技术不仅简单有效,而且锁相稳定、快速且锁相精度高,具有极高的实用价值。

Asynchronous Frequency-variable Modulation Algorithm based Digital Phase Lock Technique for UPS Inverter

This paper presents a digital phase lock technique for UPS inverter output control to meet the trend of UPS digital control.Unlike the other digital phase lock control,this technique is based on a frequency-variable asynchronous modulation algorithm.The algorithm has many advantages such as easy program,high control precision,especially it can easily modify the inverter output phase and frequency.On the basis of this algorithm and combining phase detect logical,the inverter phase lock control can be realized.Finally,the experiment result has proved that the technique is not only simple but also effective,and the phase lock process is quick and stabile and has high lock precision.It is of great practical value to UPS inverter control.