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A Study on the Power Converter Control of Utility Interactive Photovoltaic Generation System

  • Journal of The Korea Society of Computer and Information
  • Abbr : JKSCI
  • 2009, 14(2), pp.157-167
  • Publisher : The Korean Society Of Computer And Information
  • Research Area : Engineering > Computer Science

Seung-Kwon Na 1,  구기준 2,  Kim Kye Kook 3

1한국 폴릭텍 III 대학 원주 캠퍼스
2한림성심대학교
3강릉원주대학교

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ABSTRACT

In this paper, a photovoltaic system is designed with a step up chopper and single phase PWM(Pulse Width Modulation) voltage source inverter. Where proposed Synchronous signal and control signal was processed by one-chip microprocessor for stable modulation. The step up chopper operates in continuous mode by adjusting the duty ratio so that the photovoltaic system tracks the maximum power point of solar cell without any influence on the variation of insolation and temperature because solar cell has typical voltage and current dropping character. The single phase PWM voltage source the inverter using inverter consists of complex type of electric power converter to compensate for the defect, that is, solar cell cannot be developed continuously by connecting with the source of electric power for ordinary use. It can cause the effect of saving electric power, from 10 to 20[%]. The single phase PWM voltage source inverter operates in situation that its output voltage is in same phase with the utility voltage. In order to enhance the efficiency of photovoltaic cells, photovoltaic positioning system using sensor and microprocessor was designed so that the fixed type of photovoltaic cells and photovoltaic positioning system were compared. In result, photovoltaic positioning system can improved 5% than fixed type of photovoltaic cells. In addition, I connected extra power to the system through operating the system voltage and inverter power in a synchronized way by extracting the system voltage so that the phase of the system and the phase of single-phase inverter of PWM voltage type can be synchronized. And, It controlled in order to provide stable power to the load and the system through maintaining high power factor and low output power of harmonics.

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