SYNTHESIS OF POWER PROCESSING IN DC DISTRIBUTION SYSTEMS USING CASCADED CONVERTERS, LFRS AND SLIDING-MODE CONTROL TECHNIQUE
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Abstract
Switching dc-dc converters are widely used to interface the dc output of renewable energy resources with power distribution systems in order to facilitate the use of energy at the customer side. In this paper, a system connected to a PV panel, fuel cell ,wind turbine consisting of two cascaded dc-dc boost converters under sliding-mode control and working as loss-free resistors , gyrator ,transformer is studied. The modeling, simulation, and design of the system are addressed. First, an ideal reduced-order sliding-mode dynamics model is derived from the full-order switched model taking into account the sliding constraints, the nonlinear characteristic of the PV module, and the dynamics of the MPPTcontroller. For this model, a design-oriented averaged model is obtained and its dynamic behavior is analyzed showing that the system is asymptotically globally stable. Moreover, the proposed system can achieve a high conversion ratio with an efficiency close to 95% for a wide range of working power. Numerical simulations and experimental results corroborate the theoretical analysis and illustrate the advantages of this architecture in PV systems. The proposed method can be used for the other DC/DC converter. This paper proposes the new cascaded series parallel design for improved dynamic performance of DC-DC buck boost converters by a new Sliding Mode Control (SMC) method. The converter is controlled using Sliding Mode Control method that utilizes the converter’s duty ratio to determine the skidding surface. System modeling and simulation results are presented. Microgrid is one of new conceptual power systems for smooth installation of many distributed generations (DGs). While most of the microgrids adopt ac distribution as well as conventional power systems, dc microgrids are proposed and researched for the good connection with dc output type sources such as photovoltaics (PV), fuel cell, and secondary battery. Moreover, if loads in the system are suppliedwith dc power, the conversion losses from sources to loads are reduced compared with ac microgrid. As one of the dc microgrids, we propose “low voltage bipolar type dc microgrid” which can supply super high quality power with 3-wire dc distribution line.
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