电力系统保护与控制2012，Vol.40Issue(2)：34-39,6.
配电网中的电力电子变压器研究
A power electronic transformer applied to distribution system
凌晨 1葛宝明 1毕大强2
作者信息
- 1. 北京交通大学电气工程学院,北京100044
- 2. 电力系统国家重点实验室,清华大学电机系,北京100084
- 折叠
摘要
Abstract
The paper proposes a new power electronic transformer (PET) for the application in the distribution system, which adopts the three-stage circuit topology. The input stage uses three-phase three-level PWM rectifier to reduce the voltage stress rating of components, where the reactive power and high-voltage dc-link voltage closed-loop controls are adopted to adjust the reactive power and stabilize the dc-link voltage at the high-voltage side. The isolation stage employs the high-voltage frequency converter which adopts three-level topology at high-voltage side and diode rectification at low-voltage side to realize dc/dc conversion and isolation from the high-voltage side to the low-voltage side, furthermore, the constant low dc voltage is maintained by using output voltage closed-loop control. The output stage adopts three-phase two-level inverter at low, voltage side which outputs the desired voltage and power to the load through the output voltage closed-loop control. With the three-stage control strategy responding to three-stage circuit, it can make the PET's input currents sinusoidal and the output voltages of load side constant, real power transmission flexible, and reactive power injected into power grid. The working principle of each component of the proposed PET system is explained in detail and the simulation model is established based on Matlab/Simulink, and this system is also implemented in laboratory based on DSP TMS320F2812. The simulation and experimental results verify the feasibility and validity of the proposed PET system.关键词
电力电子变压器/配电网/三电平/电能变换Key words
PET/ distribution system/ three level/ power conversion分类
信息技术与安全科学引用本文复制引用
凌晨,葛宝明,毕大强..配电网中的电力电子变压器研究[J].电力系统保护与控制,2012,40(2):34-39,6.
