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Inverting device and solar PV (Photovoltaic) grid-connected system applying same

An inverter device and inverter technology, applied in the field of solar photovoltaic power generation, can solve the problems of increased switching loss of inverters, difficulties in improving efficiency, and rising bus voltage, and achieve the goals of reducing switching losses, improving efficiency, and reducing energy consumption Effect

Active Publication Date: 2012-06-27
HUAWEI DIGITAL POWER TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the energy consumption of the booster circuit accounts for a relatively high proportion of the energy consumption of the entire system, making it difficult to improve the efficiency of the entire system (the ratio of the output power to the input power of the system)
[0008] In addition, when the voltage of the solar panel is high, due to the existence of the boost circuit, the bus voltage of the inverter increases, which increases the switching loss of the inverter and further reduces the efficiency of the entire system

Method used

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  • Inverting device and solar PV (Photovoltaic) grid-connected system applying same
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  • Inverting device and solar PV (Photovoltaic) grid-connected system applying same

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Embodiment 1

[0025] This embodiment provides an inverter device for converting DC power into AC power so as to provide AC power for loads such as a power grid and a motor. Such as figure 2 As shown, the inverter device has the following structure.

[0026] The inverter device includes: a bridge inverter 21 and a boost circuit 22, wherein the bridge inverter includes at least one bridge arm, figure 2 The bridge inverter shown has three bridge arms, each of which has the same structure and can output three-phase AC power. Of course, the number of bridge arms is not limited to this, and the bridge arms can be increased or decreased according to the demand of the load. The number of phases to obtain the increased or decreased AC energy. The structure of the at least one bridge arm is introduced below by taking the bridge arm 23 in the dotted line box in the figure as an example.

[0027] The bridge arm 23 includes: first to third power switch tubes ( T21 , T22 and T23 ) and a first diode ...

Embodiment 2

[0075] This embodiment provides a solar photovoltaic grid-connected system, such as Figure 10 As shown, the system includes: a solar panel 101 , an inverter device 102 provided in Embodiment 1, a filter circuit 103 , a main control device 104 and a power grid 105 . The inverter device 102 is used to convert the DC power provided by the solar panel 101 into AC power through the control of the main control device 10, and through the inverter device 102 and the power grid 105 Filtering by the filter circuit 103 transmits the AC power to the grid 105 . The specific circuit structure and working principle of the inverter device 102 have been described in detail in Embodiment 1, and will not be repeated here.

[0076] In this embodiment, due to the use of the inverter device provided in Embodiment 1, the efficiency of the solar photovoltaic grid-connected system can be significantly improved.

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Abstract

The embodiment of the invention discloses an inverting device and a solar PV (Photovoltaic) grid-connected system applying the same, relates to the technical field of solar PV power generation, and solves the problems that in the existing inverting device, the energy consumption of a boosted circuit is higher, and the switching loss of an inverter is higher. In the embodiment of the invention, when the voltage of a direct-current power supply which is used for supplying power for the inverting device is lower, direct-current electricity can be simultaneously and directly supplied for the inverter in the inverting device through the boosted circuit and the direct-current power supply, thus the inverter can work in an inverting mode of three electric levels, not only can the energy consumption of the boosted circuit be reduced, but also the switching loss of the inverter can be reduced, and the efficiency of the whole system can be obviously increased when the inverting device is applied to a solar PV grid-connected system.

Description

technical field [0001] The invention relates to the technical field of solar photovoltaic power generation, in particular to an inverter device and a solar photovoltaic grid-connected system using the same. Background technique [0002] With the depletion of conventional energy and increasingly serious environmental problems, solar photovoltaic power generation, as an emerging clean energy industry, is developing very rapidly, with an annual growth rate of 30%. [0003] The inverter device is a bridge connecting solar photovoltaic power generation to the grid, and is one of the necessary equipment in the grid-connected solar photovoltaic power generation system. It is used to convert the direct current generated by the solar cells into the alternating current required by the grid. [0004] figure 1 The structure of the grid-connected solar photovoltaic power generation system used in the prior art is shown. The system includes: a solar panel 11 , an inverter device 12 , a ...

Claims

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Application Information

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IPC IPC(8): H02M7/5387H02M3/155H02J3/38
CPCH02M7/48H02M7/483Y02E10/56H02M7/5387H02M7/487Y02E10/563H02M2001/007H02J3/383H02J3/00H02J3/38H02M3/155H02M7/5388H02M3/158H02J2300/24H02J3/381H02M1/007
Inventor 李泉
Owner HUAWEI DIGITAL POWER TECH CO LTD
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