电力电子变压器输出特性仿真分析

Simulation Analysis of Output Characteristics of Power Electronic Transformer

输出电流是电力电子变压器的一项重要参数,输出电流过大时,可能会导致电力电子变压器发热严重,甚至烧坏;输出电流过小或者不稳定、畸变都会在一定程度上增大电力电子变压器损耗,从而加速内部元器件老化,利用率降低.为了研究电力电子变压器输出电流的控制策略,本文对AC-DC-AC型电力电子变压器,在MATLAB/SIMULINK中进行相应控制策略仿真,包括PWM控制、并联运行、SVPWM控制及电流跟踪滞环比较方式.仿真结果表明:通过运用不同的控制策略,可以使电力电子变压器输出电流呈现不同的输出特性,在一定程度上优化输出特性.

Output current is an important parameter of the power electronic transformer.Too large output current,may result in serious pever of the power electronic transformers,and even burning out,if the out-put current is too small or unstable,distortion will be increased to a certain extent,causing power electronic transformer loss,thus accelerating aging internal components and lowering utilization.In order to study the control strategy of the output current of the power electronic transformer,this paper,aiming at ac-dc-ac type power electronic transformer,carries out the corresponding control strategy simulation of the power elec-tronic transformer in MATLAB/SIMULINK,including:PWM control,parallel operation,SVPWM control and current tracking hysteresis comparison mode.The simulation results show that the output current of the power electronic transformer can present different output characteristics by using different control strategies,and the output characteristics can be optimized to some extent.