Inverse-excitation type single-stage inverter for interconnected photovoltaic power generation system

A flyback transformer and flyback technology, which is used in photovoltaic power generation, irreversible DC power input conversion into AC power output, electrical components, etc., can solve the problem of reducing power conversion efficiency, increasing the volume and weight of the whole machine, and increasing the system Complexity and other issues, to achieve the effect of reducing switching loss, simple control scheme, and achieving high-frequency electrical isolation

Inactive Publication Date: 2008-09-03
南京冠亚电源设备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Compared with the single-stage structure, the two-stage structure of DC/DC straight-to-straight converter + DC/AC inverter increases the complexity of the

Method used

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  • Inverse-excitation type single-stage inverter for interconnected photovoltaic power generation system
  • Inverse-excitation type single-stage inverter for interconnected photovoltaic power generation system
  • Inverse-excitation type single-stage inverter for interconnected photovoltaic power generation system

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Embodiment Construction

[0011] Below in conjunction with accompanying drawing and specific embodiment, the present invention will be further described:

[0012] As shown in Figure 1, the flyback single-stage inverter of this embodiment is characterized in that it includes an input side circuit 1, a flyback transformer 2 and an output side circuit 3, and the output end of the output side circuit is connected to the external load connection, the input side circuit 1, the anode of the photovoltaic array E and the first capacitor C 1 The anode of the flyback transformer is connected to the anode, and at the same time, it is connected to one end p of the primary winding of the flyback transformer 2 1 Connected, the cathode of the photovoltaic array E and the first capacitor C 1 connected to the cathode of the first power switch S at the same time 1 connected to the cathode of the first power switch S 1 The anode of the flyback transformer 2 and the other end of the primary winding p 2 Connected; one s...

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Abstract

The invention discloses an inverse-excitation type single-stage inverter used in an interconnected photovoltaic power generation system, including an input side circuit, an inverse-excitation transformer and an outlet side circuit, wherein, the input side circuit includes a photovoltaic array, a first filtering capacitance and a first power switch tube, which are connected to the primary side of the transformer; and the outlet side circuit includes a second to fifth power switch tube and a second filtering capacitance, which are connected to the secondary side of the transformer. The invention has the following advantages that the single-stage structure not only realizes voltage boosting inversion output, but also reduces the size, volume weight and cost of the complete machine; high-frequency electric insulation is realized; the entire circuit has no other magnetic components except the high-frequency inverse-excitation transformer, the entire circuit uses less power devices with simple structure and small spending; and the control scheme is more simple and is easy of implementing.

Description

1. Technical field [0001] The invention relates to an inverter in a power conversion device, in particular to an inverter capable of realizing single-stage step-up and inverter. 2. Background technology [0002] The application and demand of outdoor grid-connected photovoltaic power generation is becoming more and more extensive. For example, projects such as "rural biogas system" and "photovoltaic pest early warning or pest control system" in the "Siyuan Project" proposed by the state recently require the use of grid-connected photovoltaic power generation system. At present, the price of photovoltaic system is still relatively expensive. How to reduce its cost and provide poor areas with high-quality and low-cost outdoor grid-connected photovoltaic power generation systems under the premise of ensuring performance is an important task for scientific and technological workers in enterprises and colleges. topic. At present, the inverter power supply of the photovoltaic syst...

Claims

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Application Information

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IPC IPC(8): H02M7/48H02M7/537
CPCY02E10/56
Inventor 张海波
Owner 南京冠亚电源设备有限公司
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