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High-performance solar photovoltaic (PV) energy conversion system

  • US 7,479,774 B2
  • Filed: 04/07/2006
  • Issued: 01/20/2009
  • Est. Priority Date: 04/07/2006
  • Status: Expired due to Fees
First Claim
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1. A high-performance solar photovoltaic (PV) energy conversion system, comprising:

  • a solar panel, for absorbing Sun radiation and making photovoltaic conversion to produce electricity;

    a high-boost ratio DC/DC conversion circuit, converting low DC electricity to high voltage DC electricity, and outputting to a high voltage bus bar, the high-boost ratio DC/DC conversion circuit comprising;

    a first winding circuit comprising a power semiconductor switch and a first winding of a coupling inductor, the polar terminal of the first winding of a coupling inductor being defined as connecting to the positive post of the DC input circuit,a passive regenerative snubber circuit comprising a clamping diode, a discharging diode and a clamping capacitor,a second winding circuit comprising a high voltage capacitor and a second winding of the coupling inductor, the polar terminal of the second winding of the coupling inductor being defined as connecting to the high voltage capacitor, anda filter circuit comprising a filter capacitor and a rectification diode;

    a system controller, containing a microprocessor and a drive circuit, responsible for system control;

    a full-bridge inverter comprising, four power semiconductors switches, connects to the high voltage bus bar, controlled by the system controller to be used in converting DC voltage to AC voltage;

    a clamping inductor, connecting between the full-bridge inverter and utility-grid, used for filtering high frequency components in the output voltage of the inverter, and converting AC voltage output to AC current output; and

    a driving device, a low power motor to support and drive the solar panel, and controlled by the system controller to change surface angle of the solar pane, wherein said microprocessor executes a total sliding mode control strategy, a sun tracking strategy and an adaptive step-perturbation method;

    establishes Sinusoidal Pulse-Width-Modulation output module, outputting Pulse-Width-Modulation signal; and

    through the inverter drive circuit drives the power semiconductor switch of the full-bridge inverter to control the output current of the inverter.

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