Control of a SIC-based cascaded multilevel converter cell for solar applications
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Universidade Federal de Minas Gerais
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Central inverters based on conventional topologies are the current preferred solution in solar farms because of their low cost and simplicity. However, such topologies have some disadvantages: poor Maximum Power Point Tracking (MPPT), and the use of bulky filters and Low Frequency (LF) transformers. An attractive alternative in this case is the Cascaded Multilevel Converter (CMC), which can provide a distributed MPPT control, allied with overall reduced footprint and high flexibility. A CMC cell using silicon carbide devices has been proposed and designed in previous works to incorporate three main functions: MPPT control of a Photovoltaic (PV) array, galvanic isolation through a Solid-State Transformer (SST) and control of grid power flow. This work proposes a closed-loop control strategy for each stage of the CMC cell and shows its validation thorough simulations. Experimental results are performed and presented in a single-phase 6.2 kW prototype cell. These results lead to the conclusion that the applied control techniques are suitable to the PV application.
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Conversores eletrônicos, Geração de energia fotovoltaica, Energia renovável
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Voltage control , Topology , Silicon carbide , Inductors , Maximum power point trackers , Pulse width modulation , Voltage measurement, Photovoltaic Inverters , Solid-State Transformer , Silicon Carbide , Closed-loop Control , Cascaded Multilevel Converter, Multilevel Converter , Cell Stage , Closed-loop Control , Silicon Carbide , Photovoltaic System , Maximum Power Point , Maximum Power Point Tracking , Solar Power Plants , Power Point Tracking , Solid-state Transformer , Galvanic Isolation , Frequency Transformer , Conventional Topology , Simulation Results , Step Change , Current Control , Switching Frequency , PI Controller , Power Quality , Control Stage , Input Stage , DC Link , Output Stage , Resonant Controller , Phase-locked Loop , Turns Ratio , Power Reference , Primary Voltage , Grid Side , Current Stress