摘要
提出了一种基于平衡变压器的单相变三相电源转换供电方式。该方式将单相输入交流电压通过变流器分出幅值相等、相位正交的另一相(β相)电压,与输入电压(α相)组成两相正交电压,经两相-三相平衡变压器转换为三相对称电压对三相负荷供电。提出了一种PWM整流器控制策略,在供给β相有功电流同时补偿α相的谐波电流,抑制当三相负荷为非线性时所产生的谐波电流,使总的输入电流具有高功率因数和良好的正弦波形。在向同一负载供电时,该方式比传统的单相变三相变流器用到的功率器件更少,承受的功率更小。仿真结果证明了该供电方式结构及其控制策略的正确性和可行性。
A power supply converter from single- phase to three- phase based on balance transformer is proposed,which generates β- phase voltage by phase- shift converter,which is orthogonal to α-phase（input） voltage with same amplitude,and then produces symmetric three-phase voltages for load by two- three phase balance transformer. A control strategy of PWM rectifier is given,which compensates α- phase harmonic current while supplies β- phase active current. It suppresses the harmonic current induced by nonlinear three- phase loads and makes the input single- phase current sinusoidal and the power factor higher. Compared with traditional single- three phase converter,the phase- shift converter needs less power devices and bears less power. Simulative result shows that the power supply structure and control strategy are correct and practical.
出处
《电力自动化设备》
EI
CSCD
北大核心
2008年第11期61-65,共5页
Electric Power Automation Equipment
关键词
单相-三相
变流器
平衡变压器
高功率因数
谐波电流
single- three phase
converter
balance transformer
high power factor
harmonic current
