Method and device for starting inverter

An inverter and inverter module technology, applied in the field of electric power, can solve the problems of affecting the life of the inverter, power consumption of the grid, large short-circuit current, etc.

Active Publication Date: 2013-07-31
HUAWEI DIGITAL POWER TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The impact of light on the load capacity of photovoltaic modules varies with the type of photovoltaic modules. When the short-circuit current of some photovoltaic modules reaches a preset threshold, its own load capacity may be less than the loss of the inverter. At this time Starting the inverter will consume the power of the grid; in addition, when the light is strong, the short-circuit current will be very large, and the detection of the short-circuit current will affect the life of the inverter

Method used

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  • Method and device for starting inverter

Examples

Experimental program
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Embodiment 1

[0052] A flowchart of a method for starting an inverter provided by an embodiment of the present invention. Among them, see image 3 , through the method provided by the embodiment of the present invention to start the above figure 1 or the inverter shown in 2, the method includes:

[0053]201: When the inverter is in an off-grid state, gradually increase the loss of the inverter;

[0054] 202: Measure the DC bus voltage at both ends of the DC bus capacitor included in the inverter;

[0055] 203: If the DC bus voltage is greater than a preset threshold, determine that the load capacity of the photovoltaic module is greater than the loss of the inverter, and start the inverter.

[0056] Further, when the inverter is in the off-grid state, gradually increase the loss of the inverter, including:

[0057] Turning on the inverter module included in the inverter, modulating the inverter module, so that the inverter module outputs a power frequency voltage, so as to increase the ...

Embodiment 2

[0069] An embodiment of the present invention provides a method for starting an inverter. Among them, the above-mentioned figure 2 The single-stage type inverter shown, such as Figure 4 as shown, Figure 4 It is a flowchart of a method for starting a single-stage inverter provided by an embodiment of the present invention. This embodiment is described by taking the inverter as a single-stage inverter as an example, wherein the single-stage inverter The inverter only includes the inverter module. Assume that the minimum grid-connected loss of the inverter is 40W, and the open-circuit voltage of the photovoltaic module is 700V. In order to ensure the reliability of grid-connected operation, when the load capacity of the photovoltaic module is greater than or equal to 60W When starting the inverter, the method includes:

[0070] 301: Disconnect the grid-connected relay of the inverter, so that the inverter is in an off-grid state;

[0071] Among them, the method of starting...

Embodiment 3

[0098] A flowchart of a method for starting an inverter provided by an embodiment of the present invention. Among them, the above-mentioned figure 1 The two-stage type inverter shown, such as Figure 5 as shown, Figure 5 It is a flow chart of a method for starting a two-stage inverter provided by an embodiment of the present invention. This embodiment is described by taking the inverter as a two-stage inverter as an example. The inverter includes an inverter module and a DCDC module. Assume that the minimum grid-connected loss of the inverter is 40W, and the open circuit voltage of the photovoltaic module is 400V. In order to ensure the reliability of grid-connected operation, when the load capacity of the photovoltaic module is greater than or When equal to 60W, start the inverter, wherein the method includes:

[0099] 401: Disconnect the grid-connected relay of the inverter, so that the inverter is in an off-grid state;

[0100] Among them, the method of starting the inve...

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Abstract

The invention discloses a method and device for starting an inverter, and belongs to the field of electric power. The method comprises the following steps: loss of the inverter is increased gradually, when the inverter is in the off-grid condition; direct current bus voltage of the two ends of a direct current bus capacitor of the inverter is measured; if the direct current bus voltage is larger than the preset threshold, the load capacity of a photovoltaic module is larger than the loss of the inverter for sure and the inverter is started; and the device comprises an adding module, a measurement module and a starting module. The method and the device have the advantages that when the inverter is in the off-grid condition, the loss of the inverter is gradually increased and the direct current bus voltage is measured to determine whether the inverter is started, so that the load capacity of the photovoltaic module can be detected accurately and the service life of the inverter cannot be affected by the detection of the load capacity of the photovoltaic module; and the method is suitable for any type of inverter.

Description

technical field [0001] The invention relates to the field of electric power, in particular to a method and device for starting an inverter. Background technique [0002] The function of the inverter is to convert the DC power of the photovoltaic module into AC power and feed it into the grid. When the inverter is running, it will generate a certain loss. Only when the load capacity of the photovoltaic module is greater than the loss of the inverter will it start The inverter is connected to the grid for operation. [0003] The prior art provides a method for starting the inverter, which can be as follows: the load capacity of the photovoltaic module increases with the increase of light, and the short-circuit current of the photovoltaic component also increases with the increase of light. The short-circuit current at both ends of the inverter is detected in real time, and if the detected short-circuit current reaches a preset threshold, the inverter is started. [0004] In ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/36
CPCY02E10/56
Inventor 蔡鹏伊磊郑越
Owner HUAWEI DIGITAL POWER TECH CO LTD
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