Abstract:By means of multi-terminal power electronic transformer (abbr. PET) the flexible power regulation path in AC/DC hybrid distribution network can be constructed for interaction and mutual aid of electric energy among multi-AC/DC hybrid distribution regions. A multi-terminal PET based day-ahead economic operation strategy for AC/DC hybrid power distribution network was proposed. Firstly, based on typical topology of AC/DC hybrid power distribution network, the flexible regulation and control capability of AC/DC hybrid power distribution network containing PET was analyzed. Secondly, according to physical constraint during the operational process of PET, the relation of power flowing of each terminal in multi-terminal PET was analyzed and an energy flowing model of the PET in AC/DC hybrid distribution network was built. Finally, taking the lowest operating cost of AC/DC hybrid distribution network as objective function and taking the system power balance, the power flow off-limit and the upper and lower limit constraints of equipment operation as the constraint conditions, a day-ahead economical operating model for AC/DC hybrid power distribution network was established and based on the CPLEX solver a method to solve the established model was put forward. Taking a demonstration project of an AC/DC hybrid power distribution network in a certain region in China for calculation example, a day-ahead economic operating model of this demonstration project was constructed and solved. The results of the calculation example show that using the proposed PET based economic operating strategy for AC/DC hybrid power distribution network the operating cost of the distribution system can be effectively reduced, and the accommodation level of renewable energy resource can be raised.
标题：基于电力电子变压器的交直流混合配电网日前经济运行策略研究
英文标题：Research on Power Electronic Transformer Based Day-ahead Economic Operation Strategy of AC/DC Hybrid Distribution Network
