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Variable-structure multi-input high-gain direct-current converter

A DC converter, multi-input technology, applied in the direction of conversion equipment without intermediate conversion to AC, can solve the problems of reduced module performance, low terminal voltage of photovoltaic panel modules, etc., to achieve small voltage stress and reduce circuit volume. and cost, the effect of reducing requirements

Inactive Publication Date: 2014-05-28
CHONGQING UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, after reasonable design, the DC voltage of wind energy after conversion is relatively high, which can generally be controlled above 150V; and limited by the mutual influence between various photovoltaic panels, photovoltaic panels cannot be connected in series too much, otherwise the entire module The performance will be greatly reduced, which indirectly leads to the relatively low terminal voltage of the photovoltaic panel module, generally between 33V and 43V

Method used

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Embodiment 1

[0033] This embodiment discloses a variable-structure multi-input high-gain DC converter with three units for renewable energy combined grid-connected power generation systems, see Figure 8 , including 3 switched capacitor units and 3 power supply units.

[0034] see Figure 7 , the jth switched capacitor unit includes a diode D j1 , Diode D j2 , capacitance C j1 and capacitance C j2 , where j=1, 2, 3. That is, the first switched capacitor unit includes a diode D 11 , Diode D 12 , capacitance C 11 and capacitance C 12 ;The second switched capacitor unit includes diode D 21 , Diode D 22 , capacitance C 21 and capacitance C 22 ;The third switched capacitor unit includes diode D 31 , Diode D 32 , capacitance C 31 and capacitance C 32 . Diode D j1 The cathode and capacitance C j2 The positive connection of the capacitor C j2 the cathode of the diode D j2 The cathode connection of the diode D j1 The anode connection capacitance C j1 the positive pole of the ...

Embodiment 2

[0040] This embodiment discloses a switched-capacitor voltage accumulator (Switched-Capacitor Voltage Accumulator, SCVA) for renewable energy combined grid-connected power generation systems, and further proposes a variable-structure multi-input high-gain DC converter ( Variable-Structure High-Gain Multiple-Input Converter, VSHG-MIC) topology. The combined renewable energy grid-connected power generation system composed of this topology is as follows: figure 1 shown. Based on the VSHG-MIC, it can realize the joint power supply of various renewable energy sources, and can also achieve high gain when the solar energy with a lower voltage level is powered alone. The structure diagram of the VSHG-MIC circuit is as follows figure 2 As shown, when a variety of renewable energy sources are jointly powered, the VSHG-MIC circuit works the same as the ordinary MIC circuit, which is equivalent to the series modulation of multiple voltage sources, and can realize the control of energy d...

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Abstract

The invention aims to provide the circuit topology of a variable-structure multi-input high-gain direct-current converter. By means of the variable-structure multi-input high-gain direct-current converter, combined power generation of various renewable energy sources can be realized, high gain generated during independent solar power generation at a low voltage level can also be realized, and the cost and the complexity of a system are not increased at the same time.

Description

technical field [0001] The invention relates to the field of combined grid-connected power generation of renewable energy sources. Background technique [0002] Due to the increasingly tense world energy situation, serious environmental pollution, global warming and other reasons, the development and utilization of renewable energy has attracted more and more attention. With the rapid development of micro-energy generation technology represented by renewable energy, distributed generation technology and energy storage technology, hybrid energy systems are gradually becoming a research hotspot. At present, renewable energy power generation that is widely used mainly includes photovoltaic power generation, wind power generation, hydropower generation, geothermal power generation, etc., but all have shortcomings such as unstable power supply, discontinuity, and changes with climatic conditions. Therefore, it is necessary to use a variety of renewable energy Distributed grid-co...

Claims

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Application Information

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IPC IPC(8): H02M3/07
Inventor 侯世英陈剑飞王俪蓉陈复王玉峰陈柯雨刘孜宇毕晓辉龚嫄孙韬
Owner CHONGQING UNIV
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