Y9.GEH.1.4: Multi-SST Islanding, Black Start Functionality and Communications with DGI
نویسندگان
چکیده
1. Project Goals FREEDM system consists of SST, FID, DESD, DRER, and DGI. The SST-based microgrid system can have many functionalities using communication capability provided by DGI and other components such as DESD, DRER, and DESD. A new type of islanding and seamless reconnection strategies are developed to cope with the case when the utility grid is disconnected and to increase stability and reliability of the FREEDM system. The goal is to achieve the seamless operation mode transition between the grid-connected mode and the islanding mode. Since the SST is connected to the grid, it is important to suppress the low-order current harmonics generated from the SST so that the grid is not polluted. The harmonic compensation schemes are investigated to regulate the harmonics effectively without degrading the stability of the control system. Moreover, nonlinear load which is connected to the grid can be distributed to the multiple SSTs which operate in parallel. Flexible harmonics control strategy is investigated to maximize the controllability of the Multi-SST system.
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