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The analysis and design of a zero voltage switching (ZVS) full bridge DC/DC converter control is discussed in this paper. The power converter is used to regulate the output dc voltage. With this objective, the control strategy presented here is designed based in the equations that describe the output current and output voltage dynamics. The proposed controller employs a dual-loop scheme implemented...
In this paper we propose a direct power controller (DPC) for three phase three-level neutral point clamped (NPC) rectifiers. This type of converter can operate as rectifier or inverter; as rectifier, two capacitors are placed at the dc output in order to produce smooth voltage, while reducing the size of the capacitors themselves. The control objective becomes twofold. From the power management perspective,...
In this paper a theoretical framework for the incorporation of the effect of excitation limits on normal form analysis is presented. The limiter action is approximated by a smooth nonlinear type atan function which is incorporated in the power system dynamic model using singular perturbation theory. This generalized limiter model is employed to characterize the limits of a simple DC excitation system...
Conventional Direct Power Control (DPC) technique is a simple and efficient control strategy for three-phase power synchronous rectifiers. However its performance is deteriorated when the power rectifier is working under distorted or unbalanced input voltages. In this paper the distorted input voltages operation of the system is under concern, and a model-based DPC for three-phase power converters...
In this paper is studied the single-phase two-cell multilevel cascade H-bridge power converter connected to the grid, acting as a synchronous rectifier. The power exchange process between the cells of the converter and the grid is analyzed. Based on this analysis and on the power converter model the stages of the controller design process are shown. A new controller for the cascade power converter...
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