作　　者： ; ; ; ;

机构地区： 广州科技贸易职业学院

出　　处： 《电力电子技术》 2009年第8期49-51,共3页

摘　　要： 锁相性能是衡量UPS性能的一个重要指标。在市电畸变情况下,传统的过零检测鉴相方法容易得到错误的相位信息而导致锁相环失锁。提出一种基于瞬时功率理论的三相UPS锁相方法。该方法通过消除瞬时功率的直流分量达到锁相目的。该锁相环带有正序分量检测环节,能够在市电电压不平衡情况下,实现对其基波正序分量的锁相。对锁相环模型进行了分析,确定了环路滤波器参数的选取原则。系统由32位TMS320F2812型DSP实现全数字化控制。实验结果表明了该锁相系统的良好性能。 The characteristic of phased-locked loop（PLL）is an important index to evaluate the performance of uninterruptible power supply （UPS）.The classical phase discriminator of PLL depending on detecting the zero-crossing points results in false phased-locked lock easily due to the error phase information under distorted utility conditions.This paper proposes a PLL based on instantaneous power theory for three-phase UPS,which implements three-phase phase-locked through eliminating the DC component of instantaneous power.The proposed PLL system can detect the positive sequence component to realize phase-locked of the fundamental wave of unbalanced utility.The PLL model is analyzed, and how to determine the parameters of loop filter is introduced.The system is full-digitally controlled by 32 bit TMS320F2812 DSP.Experimental results verify the good oerformance of the orooosed PLL for three-phase UPS.

关 键 词： 不间断电源 锁相环控制 瞬时功率 畸变市电

领　　域： [电气工程] [电子电信]