High-performance solar photovoltaic (PV) energy conversion system
First Claim
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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Abstract
The present invention focuses on the development of a high-performance solar photovoltaic (PV) energy conversion system. The power circuit of the invention is made of a two-stage circuit, connecting a step-up DC-DC converter and a full-bridge inverter in serial. The present invention uses an adaptive perturbation and observation method to increase tracking speed of maximum power position and at the same time reduces energy loss. In addition, the full-bridge inverter'"'"'s output has to have the same phase with the utility power in order to achieve unit power factor and increase the system efficiency. The present invention uses voltage type current control full-bridge inverter to achieve the goal of merging into utility grid. The present invention provides an active Sun tracking system, by utilizing the character of changing in open circuit output voltage with Sun radiation strength to follow the Sun, and decreases the system cost and increases system effectiveness.
248 Citations
4 Claims
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1. A high-performance solar photovoltaic (PV) energy conversion system, comprising:
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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, and a 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. - View Dependent Claims (2, 3, 4)
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Specification