An Enhanced Power Regulation and Seamless Operation Mode Transfer Control Through Cooperative Dual-Interfacing Converters

作者：Wang, Chengshan; Liang, Beihua; He, Jinwei^*

来源：IEEE Transactions on Smart Grid, 2018, 9(6): 5576-5587.

DOI：10.1109/TSG.2017.2691410

• Distributed generation
• microgrid
• parallel converters
• power sharing

Both voltage control method (VCM) and current control method (CCM) have been well-developed to control IX; units in a microgrid. Although conventional VCM has seamless operation mode transfer capability, it has slow power control dynamics in grid-tied operation. On the other hand, CCM features rapid power control but it can hardly provide voltage support during standalone operation of microgrids. To address these issues, a single DG unit is interfaced to the microgrid with two low power parallel converters. One converter is controlled by VCM while the other one is regulated by CCM. Through a new collaborative power control algorithm for these two converters in a single DG unit, the merits of both VCM and CCM are preserved. First, the power control dynamics of this IX; unit can he significantly improved in grid-tied operation. Second, the load demand can be accurately shared by these two interfacing converters during islanding operation. Finally, a true seamless operation mode transfer is obtained at any time instant without preparations. Evaluation results from a three-phase prototype show that the proposed interfacing converter configuration and corresponding control algorithm are more suitable for microgrid applications.

• 出版日期2018-11
• 单位天津大学