电力电子变压器与常规变压器并联输出控制技术研究

Study on Parallel Output Control Technology for PET and Conventional Transformer

电力电子变压器能够直接接入交流、直流电源或负载,并能灵活地控制潮流在各个端口的方向与分配,适应了微型电网以及分布式能源的发展需要。将电力电子变压器与常规变压器并联运行,在提高供电可靠性的同时,还能最大限度地利用清洁能源。介绍通过设置总控制器来实现电力电子变压器与常规变压器的功率优化控制策略,以及利用修正指令电流来实现多台逆变器输出均流的控制方法。搭建仿真主电路与控制电路并进行仿真分析,仿真数据表明该控制策略的可行性和正确性。

Power electronic transformer(PET) can be directly connected to the AC and DC power supply or load, and can flexibly control direction and distribution of power flow in each port. It also meets the requirements of developing micro-grid and distributed energy. Setting PET and conventional transformer in parallel operation can maximize the use of clean energy while improving the reliability of power supply. A control strategy utilizing a general controller to accomplish power optimization of PET and conventional transformer in parallel is presented in this paper. A control method of current balance control between the inverters by correcting instruction current is also introduced in this paper. It demonstrates simulation analysis of main circuit and control circuit, and the results show that the control strategy is feasible and correct.