应用于交直流配电网的电力电子变压器

针对交直流配电网的需求,提出了一种可应用于交直流配电网的电力电子变压器(power electronic transformer,PET)拓扑。与传统PET相比,该拓扑的优势在于为直流电源及直流负荷提供了接口,具备直流故障穿越能力,能够显著减少网络中换流器的数量,提高供电可靠性。同时,分析了新型PET在典型交直流配电网中的运行模式,并在此基础上,对PET各级的控制及调制策略进行了设计。最后,通过仿真验证了该拓扑及控制策略的合理性,突出了PET在交直流配电网中的能量调控作用。

Power Electronic Transformer Used in AC/DC Hybrid Distribution Network

This paper proposes a power electronic transformer (PET) topological structure which can be applied to AC/DC hybrid distribution network according to the demands of the network.Compared with traditional PET,the advantage of new PET is that it can provide interfaces for DC sources and DC loads and has the DC fault ride-through capability,so it can remarkably reduce the number of the converters in the network and improve the reliability of the power supply.Meanwhile,this paper analyzes the operation mode of new PET in typical AC/DC hybrid distribution network.On this basis,this paper designs the control and modulation strategy of PET.Finally,the rationality of the topology and control strategy is verified by simulation,which highlights the energy regulation function of PET in AC/DC hybrid distribution network.