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School of Electrical, Computer and Energy Engineering M.S. Final Oral Defense Modeling of Solid State Transformer for the FREEDM System Demonstration by Youyuan Jiang Date: April 18, 2014 Time: 8:00 AM Room: GWC 208 C Committee: Dr. Raja Ayyanar (chair) Dr. Keith Holbert Dr. Srabanti Chowdhury Abstract The Solid State Transformer (SST) is an essential component in the FREEDM system and it would have made much more impact in the future smart grid. This report focuses on the modeling of SST and the controller hardware in the loop implementation of SST for the support of the FREEDM system demonstration. The Energy based control strategy for three stage SST is analyzed and applied, a simplified average model of three stage SST that suitable for RTDS simulation has been developed in this report. The model is also useful for general time-domain power system analysis and simulation. The proposed simplified average model has been validated in MATLAB and PLECS, the accuracy of the model has been verified through comparison with the CCA average model and detailed switching model. These models are also implemented in PSCAD, and a special strategy to implement the phase shift modulation has been proposed to enable the switching model simulation in PSCAD. The implementation of the CHIL test environment of SST in RTDS is described in this report. The parameter setup of the model has been discussed in detail. One of the difficulties is the choice of the damping factor, which is revealed in this paper. Also, because of the solver, the grounding of the system has large impact on the RTDS simulation. Another problem is that the performance of the system is highly dependent on the switch parameters such as voltage and current ratings. Finally, the functionalities of the SST have been realized on the platform. The DES interface power injection and reverse power flow has been validated. Some limitations are noticed and discussed through the simulation on RTDS.