Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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New MPPT Control Strategy for Two-Stage Grid-Connected Photovoltaic Power Conditioning System

  • Bae, Hyun-Su (School of Electrical Engineering, Seoul National University) ;
  • Park, Joung-Hu (School of Electrical Engineering, Seoul National University) ;
  • Cho, Bo-Hyung (School of Electrical Engineering, Seoul National University) ;
  • Yu, Gwon-Jong (Photovoltaic Research Center, Korea Institute of Energy Research)
  • Published : 2007.04.20
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Abstract

In this paper, a simple control method for two-stage utility grid-connected photovoltaic power conditioning systems (PCS) is proposed. This approach enables maximum power point (MPP) tracking control with post-stage inverter current information instead of calculating solar array power, which significantly simplifies the controller and the sensor. Furthermore, there is no feedback loop in the pre-stage converter to control the solar array voltage or current because the MPP tracker drives the converter switch duty cycle. This simple PCS control strategy can reduce the cost and size, and can be utilized with a low cost digital processor. For verification of the proposed control strategy, a 2.5kW two-stage photovoltaic grid-connected PCS hardware which consists of a boost converter cascaded with a single-phase inverter was built and tested.

Keywords

References

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