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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...
The increasing number of renewable energy sources at the distribution grid is becoming a major issue for utility companies, since the grid connected converters are operating at different operating points due to the probabilistic characteristics of renewable energy. Besides, typically, the harmonics and impedance from other renewable energy sources are not taken carefully into account in the installation...
This paper proposed a closed-loop pulse energy modulation (PEM) control method for a grid-connected three-switch buck-boost inverter. The three-switch buck-boost inverter was studied for both discontinuous conduction mode (DCM) and continuous conduction mode (CCM). Simulations verified the closed-loop PEM control method provided high-quality current injected to the grid and insensitivity to component...
In this paper, in order to improve the in-series power decoupling circuit, an in-series and -parallel method is proposed to further reduce the extra capacitor without performance penalty. Based on DC-side in-series method and AC-side three-leg method, a novel way is given to not only reduce the DC-link capacitor but also to decrease the extra capacitor. Thus, it could further make the system high...
This paper presents an online Condition Monitoring (CM) methodology for inductors in LCL filter integrated with Active Front End Rectifier (AFER). The proposed methodology monitors the winding flux of each phase of grid side and converter side inductors and compares with the winding flux under healthy condition to detect and identify the winding fault. The developed technique uses the Fast Fourier...
This paper proposes a novel rotor position estimation algorithm for the vector control of the doubly-fed induction generators (DFIGs) in wind power applications. The proposed algorithm uses a sliding mode observer (SMO) to estimate the rotor position information from the stator currents. The estimated rotor position is then used for the position sensorless vector control of the DFIG. The proposed...
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