摘要
围绕电动汽车接入的新型电力电子变压器拓扑,提出了一种可切换功率模块的工作模式平滑切换控制策略。根据预测的交流负荷功率数据确定工作在DC/DC、DC/AC模式的可切换功率模块数量,判断可切换功率模块需要切换工作模式后,按斜坡控制缓慢降低可切换功率模块输出功率直至0,随后进行工作模式切换。这种策略能够实现逆变器输出功率平滑变化,减小切换时刻负载电压电流的畸变和三相不平衡程度,防止振荡导致逆变器过电流,提高设备安全性和可靠性。通过PSCAD仿真证明了所提策略的正确性和有效性。
A working mode smooth switching control strategy for switchable power module around the topology of new type power electronic transformer with access of electric vehicles is presented in this paper. The number of switchable power modules operating in DC/DC,DC/AC,and blocking mode is determined according to the predicted AC load power data.After determining that the switchable power module needs to switch the working mode,slowly reduce the output power of the switchable power module to 0 according to the ramp control and then the working mode is switched. This strategy can achieve a smooth change of the output power of the inverter,reduce the distortion of the load voltage and current at the switching time,prevent the breakdown of the filter inductor due to sudden changes in current,and improve the safety and reliability of the device. PSCAD simulation results verify that the proposed control strategy are correct and feasible.
作者
杨依睿
徐永海
张雪垠
徐少博
张蒙蒙
Yang Yirui;Xu Yonghai;Zhang Xueyin;Xu Shaobo;Zhang Mengmeng(State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources,North China Electric Power University,Beijing 102206,China)
出处
《电测与仪表》
北大核心
2020年第15期110-117,共8页
Electrical Measurement & Instrumentation
基金
北京市自然科学基金资助项目(3172036)。
关键词
电力电子变压器
交直流切换技术
平滑切换
power electronic transformer
AC/DC switching technology
smooth switching
