电力电子变压器对交直流混合微网功率控制的研究

针对应用于交直流混合微网的电力电子变压器(PET),分析了并网和离网两种运行模式,并设计了相应的控制策略。并网模式下,控制PET输入接口使交直流混合微网等效为"阻性负载"或"电流源",同时控制交流和直流输出接口都等效为恒定的电压源。对于离网模式,提出了混合功率下垂控制,能根据接口处频率和电压信息,结合混合微网下垂特性得到微网间需交换的功率。搭建了交直流微网系统和电力电子变压器仿真模型,仿真结果表明,在分布式能源功率波动情况下,PET能准确快速地调节主网、交流微网和直流微网三者间功率的流动,实现交直流混合微网的稳定运行,验证了控制策略的可靠性。

高性能双向直流变换技术及其应用专辑主编评述

双向直流变换技术,是一种基于双向直流变换装置接口高低压直流能量源或直流母线进行高低压侧电压匹配和功率双向流动控制的技术。近年来,随着高性能半导体器件、高效率磁性元件、先进热管理等技术和高性能控制技术的发展,双向直流变换器及其控制系统的设计成了工业界和学术界研究和发展的热点。基于当前双向直流变换技术的研究热点问题,《电源学报》特别推出“高性能双向直流变换技术及其应用”专辑,以期推进双向直流变换技术难点和热点问题的讨论。

Vibration control of the finite L-shaped beam structures based on the active and reactive power flow

This paper analyzes the physical meaning of the active and reactive power flow in the finite L-shaped beams and studies the active vibration control of the structures based on the active and reactive power flow.The traveling wave approach is used to calculate the structural dynamic responses.Because the error of control force is inevitable in practical applications,the effects of the error of control force on the control results are studied.The study indicates that the error of control force has pronounced influence on the control results of the acceleration and reactive power flow.It is obvious that the reactive power flow can represent the vibration strength component of the complex intensity,and the active power flow strongly depends on the structural damping of the finite beams.