电力电子变压器运行与控制研究

Operation and control of the power electronic transformer

电力电子变压器为基于电力电子变换器的高频变压器,是一种可取代传统工频变压器的新型技术。电力电子变压器不仅具备功率传输、电气隔离功能,且可通过变换器控制系统的优化设计,实现多项辅助功能。文中论述电力电子变压器的运行和控制策略。基于文中提出的控制策略,电力电子变压器可实现功率的双向、精确调控,并兼具无功功率、不平衡电流等辅助补偿功能。

The power electronic transformer is an emerging technology which aims at replacing the conventional low frequency power transformer with a high-frequency transformer driven based on power electronics converters. Besides the capability of the power transformer and electrical isolation,the power electronic transformer provides extended and enhanced operating capabilities that can be achieved with an appropriate controller design for the power electronics converters. In this work,the operation and control of the power electronic transformer is analyzed. Bidirectional and precise active power flow control,full reactive power control,low-voltage side current unbalance management and fault voltage ride-through are achieved based on the proposed control approach.