基于环流功率理论的单相UPS并联均流控制设计  

Design of Load Current Sharing Control for Parallel Single-phase UPS Based on Circulation Power Theory

作　　者：周星亮[1] 梁量[1] 何国辉 和军平[1] 

机构地区：[1]哈尔滨工业大学深圳研究生院,广东深圳518055 [2]科士达科技股份有限公司,广东深圳518057

出　　处：《电源学报》2011年第2期1-6,11,共7页Journal of Power Supply

基　　金：国家自然科学基金资助项目(50877015);高等学校博士点基金新教师资助项目(200802131017)

摘　　要：利用数字控制方式实现并联UPS间可靠均流具有重要的应用价值。文中通过对并联UPS环流功率模型分析,建立起N台并联UPS的环流有功功率、无功功率与逆变器输出电压幅值、相位间的量化调节关系,并采用DSP两级锁相、再调制方法,实现单相UPS输出电压幅值及相位的精确控制,从而达到准确均流目的。本设计具体以TMS320LF2806芯片、CAN通讯总线为控制核心,实现了单相4kVAUPS的并联控制,实测均流效果良好。It is very useful for UPS parallel operation using digital load current-sharing control technique. After detailed analysis of the circulation power model in a UPS parallel system with N modules, a series of equations are built, which describe the relationship between the circulation current active power and reactive power and the amplitude and phase of UPS output voltage. Further more, two-level phase-locked technique and re-modulation technique for DSP frequency control is introduced to realize the precise and effective regulation on output voltage amplitude and phase for a UPS module. Thus a good load-sharing effect is achieved accordingly. In the end, a parallel UPS system with two 4kVA modules is built, which uses TMS320LF2806 DSP and CAN communication bus as core techniques. The performances of load-sharing using circulation power control method are validated by experiments.

关 键 词：UPS并联 均流控制 环流功率 

分 类 号：TM714.2[电气工程—电力系统及自动化]