Quadratic voltage multiple unit DC-DC converter for photovoltaic system

A technology of DC-DC and photovoltaic systems, applied in photovoltaic power generation, control/regulation systems, DC power input conversion to DC power output, etc., can solve the problems of high voltage gain, low efficiency, and impossibility, and achieve high The effect of improving the pressure capacity, improving efficiency, and boosting performance

Active Publication Date: 2018-08-24
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in practical applications, due to the limitation of parasitic parameters, very high voltage gain cannot be achieved
If a c

Method used

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  • Quadratic voltage multiple unit DC-DC converter for photovoltaic system
  • Quadratic voltage multiple unit DC-DC converter for photovoltaic system
  • Quadratic voltage multiple unit DC-DC converter for photovoltaic system

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Embodiment Construction

[0025] The technical solution of the present invention will be further introduced below in combination with specific embodiments.

[0026] The first specific embodiment of the present invention discloses a secondary type multi-voltage unit DC-DC converter for photovoltaic systems, such as figure 1 shown, including the input supply V in , input supply V in The positive connection of the inductance L 1 at one end, the inductance L 1 The other ends are connected to the freewheeling diode D 1 anode and freewheeling diode D 2 anode of the freewheeling diode D 1 The cathodes of the coupled inductors are respectively connected to the primary winding L of the coupled inductor 2 One end of the capacitor C 1 One end of the freewheeling diode D 5 The anode of the coupled inductor primary winding L 2 Connect the other end of the capacitor C 4 One end of the freewheeling diode D 2 The cathode and the drain of the switching tube S, the capacitor C 4 The other ends are connected ...

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Abstract

The present invention discloses a quadratic voltage multiple unit DC-DC converter for a photovoltaic system. The converter is improved in boost performance through fusion of a boost unit structure ofa voltage multiple unit compared to a traditional boost converter. Compared to a traditional boost unit of a voltage multiple unit structure, the converter has a good boost voltage performance with the increasing of a duty ratio. The quadratic voltage multiple unit DC-DC converter further fuses a quadratic boost circuit structure to further improve the voltage gain, the number of switch tubes S isnot increased, the control difficulty of the system is not increased, and the electrical stress of the switch tubes S and an output rectifier diode Do cannot be influenced. Besides, the quadratic voltage multiple unit DC-DC converter further fuses a leakage inductance clamping circuit structure to allow the energy of the leakage inductance of a coupled inductor to have a releasing loop on a basisof improving the converter boost capacity by employing the coupled inductor so as to avoid the circuit resonance problem caused by leakage inductance energy and improve the circuit efficiency.

Description

technical field [0001] The invention relates to a DC-DC converter, in particular to a secondary type multi-voltage unit DC-DC converter for a photovoltaic system. Background technique [0002] With the depletion of traditional fossil energy and the deteriorating environment of human beings, the development of clean renewable energy is imminent. All countries in the world are committed to the research and development of new energy applications, of which solar energy and wind energy have been obtained a wider range of applications. However, for these systems, how to operate grid-connected and meet the high voltage requirements in the grid is still the most important issue. At present, a large number of boost converters have been developed to meet these applications. Among different converters, the traditional BOOST converter can theoretically increase the voltage gain by increasing the duty cycle. However, in practical applications, due to the limitation of parasitic paramet...

Claims

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Application Information

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IPC IPC(8): H02M3/155
CPCH02M3/155H02M3/1552Y02E10/56
Inventor 林明耀艾建刘同民陈云琦
Owner SOUTHEAST UNIV
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