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This paper presents a detailed analytical model of the Gen-II solid state transformer (SST) being developed at Future Renewable Electric Energy Delivery and Management (FREEDM) Center. This work is a first step to develop control oriented models of SST for supporting system level stability studies and distributed control designs. A complete analytical SST model including power stage and closed loop...
Impedance is very important for power electronic systems because of the close relationship between impedance and system stability. The power converters are typical nonlinear dynamic systems in frequency domain. With a sinusoidal input voltage perturbation excitation, the input current contains not only the input perturbation frequency, but also multiple other frequency components. Therefore, the input...
In this paper, a detailed mathematical presentation of Photovoltaic (PV) generation system, as well as its simulation model based on MATLAB / Simulink is established first. Its inverter-based simplified models, i.e. the switching-function equivalent model and average model, are simulated and compared quantitatively from different aspects. Simulation results reveal that the switching-function equivalent...
Utilities implementing grid modernization programs, or facing challenges of increased level of renewable integration, are seeking tools that can provide distributed and dynamic volt-VAR control. This paper presents a distributed autonomous volt-VAR control approach that uses a large number of small rated VAR injection sources to convert a distribution feeder into a dynamically controllable VAR source...
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