摘要
电力电子变压器(PET)是一种采用电力电子变换器和高频开关变压器的电能传输装置,在电力系统配电网中具有潜在的应用价值。提出了一种新型PET,其组成是:变压器前级即高压端只有一级单相-单相交交变换器,可以得到高频交变电压;变压器后级即低压端为一级单相-单相交交变换器,经过滤波得到低压工频电压;最后级为阻性变换器,可以获得低压直流电压输出和单位输入功率因数。结果可以得到网侧单位功率因数,同时具备四象限功能。对这种PET进行了理论分析和仿真分析,并进行实验验证。结果表明:这种PET具有结构简单、控制容易、换流安全、单位输入功率因数、双向功率流动以及便于级联等特征,具有一定的应用价值。
Power Electronics Transformer （PET） is a power transmission device using power electronic converter and high-frequency switch transformer, which has potential application value in distribution networks. This paper presents a novel PET with only one stage single-phase to single-phase AC/AC converter at the primary side of the transformer, the high voltage end, which generates high- frequency alternating voltage; The secondary side of the transformer, the low voltage end, is also one stage single-phase to single phase AC/AC converter, by which low power frequency voltage can be created; The final stage is a resistive converter obtaining low DC output voltage and unitary input power factor. Consequently, the unitary power factor can be reflected to the mains side and the PET owns a four-quadrant operation capability. The theory of four-quadrant PET is analyzed and the simulation analysis using MATLAB/SIMULINK is also provided. The result shows that this kind of PET holds some prominent advantages such as simple structure, easy to control, safe commutation, unitary input power factor, bidirectional power flow and easy to cascadel So it has aoolication value.
出处
《电气自动化》
2012年第2期51-54,共4页
Electrical Automation
基金
自然科学基金项目的支持(60934005)
关键词
配电网
电力电子变压器
单相-单相交交变换器
阻性变换电路
网侧单位功率因数
Distribution network
Power electronic transformer
Single-phase to single-phase AC/AC converter
Resistive converter
Unitary power factor at mains side
