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Grid Connected PV System with Single Source Five Stage Multi Level Inverter

  • Unique Paper ID: 167014
  • Volume: 11
  • Issue: 3
  • PageNo: 180-186
  • Abstract:
  • This five-stage converter helps to nearly double the power handling capacity of the inverter as compared to two-stage converters. Design challenges for grid-connected solar photovoltaic systems related to the power conditioning units are power quality, efficiency, reliability, cost of implementation, etc. This article deals with a single DC-source-based five-level-doubling network high-resolution multilevel inverter topology with the appropriate blend of switches to address most of the practical constraints of central DC source application. A five-stage high-resolution multilevel inverter solution is adapted to double the inverter utilization as well as to increase efficiency. Reactive power handling and fault-blocking capability of the system are also demonstrated in this work. The converter is extensively simulated using MATLAB/Simulink. Experimental results from the laboratory prototype confirm the usefulness of the proposed concepts. The main bridge is fed by a common PV array and isolated sources are used to feed auxiliary bridges. Although the power required by these isolated sources is much less, it is reflected in the total system cost. These isolated sources have been removed with the help of a low-gain PI controller. In this converter, only the main bridge is fed by the dc source. For grid-connected solar PV applications, all the main bridges are merged with the help of transformers and fed by a common PV array. As three DC buses are combined, there will be no mismatch during unbalancing. Hence, the system will not deviate from MPPT and power quality will be maintained. Boost converter is used in between PV and inverter. This two-stage converter helps to nearly double the power handling capacity of the inverter as compared to single-stage converters.
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Cite This Article

  • ISSN: 2349-6002
  • Volume: 11
  • Issue: 3
  • PageNo: 180-186

Grid Connected PV System with Single Source Five Stage Multi Level Inverter

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