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Method, device and system for starting an inverter

A technology of starting system and starting device, which is applied in the direction of output power conversion device, photovoltaic power generation, electrical components, etc., can solve the problem that the inverter cannot start normally.

Active Publication Date: 2018-05-01
EMERSON NETWORK POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The embodiment of the present invention provides an inverter start-up method, device and system applicable to photovoltaic power generation systems, to solve the problem that the inverter cannot work normally when the output voltage of the existing photovoltaic array is greater than the allowable operating voltage of the inverter. boot problem

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  • Method, device and system for starting an inverter
  • Method, device and system for starting an inverter
  • Method, device and system for starting an inverter

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Embodiment 1

[0044] Such as figure 1 As shown, it is a schematic flow chart of the inverter start-up method described in Embodiment 1 of the present invention. The inverter start-up method can be applied to a photovoltaic power generation system, and this embodiment of the present invention does not make any limitation thereto. Specifically, the inverter startup method may include the following steps:

[0045] Step 101: Obtain the output voltage of the photovoltaic array before starting the inverter.

[0046] Specifically, in the embodiment of the present invention, the output voltage of the photovoltaic square array can be obtained by adopting a common voltage obtaining method in the prior art. For example, the output voltage of the photovoltaic array can be obtained by obtaining the output voltage of the photovoltaic array detected by the voltage detection device, which will not be described in this embodiment of the present invention.

[0047] Step 102: If it is determined that the ob...

Embodiment 2

[0071] Embodiment 2 of the present invention provides an inverter starting device that can be used to implement the method shown in Embodiment 1 of the present invention, such as Figure 6As shown in , it is a schematic structural diagram of the inverter starting device described in Embodiment 2 of the present invention. The inverter starting device may be applicable to a photovoltaic power generation system, which is not limited in this embodiment of the present invention. In addition, it should be noted that the inverter starting device can be an independent device different from the photovoltaic power generation system, or an integrated device integrated in the photovoltaic power generation system, and this embodiment of the present invention does not make any limited.

[0072] Specifically, the inverter starting device may include a voltage acquisition module 11 and a starting control module 12, wherein:

[0073] The voltage obtaining module 11 can be used to obtain the ...

Embodiment 3

[0088] Embodiment 3 of the present invention provides an inverter starting system, and the inverter starting system is applicable to a photovoltaic power generation system, which is not limited in this embodiment of the present invention. Such as Figure 7 ~ Figure 9 As shown, it is a schematic structural diagram of the inverter start-up system in Embodiment 3 of the present invention. The inverter start-up system may include a photovoltaic array 21 and an inverter 22, and may also include a voltage detection device 23 and an inverter Transformer starting device 24, wherein:

[0089] The voltage detection device 23 can be used to detect the output voltage of the photovoltaic array 21; The inverter starting device 24 is connected to detect the output voltage of the photovoltaic array 21 in real time, and the detected output voltage of the photovoltaic array 21 is sent to the inverter starting device 24; it should be noted that , the voltage detection device 23 can generally b...

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Abstract

The invention discloses an inverter starting method, an inverter starting device and an inverter starting system applicable to a photovoltaic power generation system. Under the condition of not adding any external load, high-voltage startup of an inverter can be completed by taking a bus capacitor of the inverter as a short-term load to clamp the bus voltage of the inverter within an allowable working voltage range of the inverter and quickly outputting energy of a photovoltaic array through the inverter. Therefore, the problem that an inverter cannot be started normally when the output voltage of a photovoltaic array is greater than the allowable working voltage of the inverter currently is solved, and high-voltage startup of an inverter is realized on the basis of not increasing the system cost.

Description

technical field [0001] The present invention relates to the technical field of photovoltaic power generation, in particular to an inverter starting method, device and system applicable to photovoltaic power generation systems. Background technique [0002] Photovoltaic Power System (PV or Photovoltaic for short) refers to a power generation system that uses photovoltaic panels to convert solar energy into electrical energy. It has the characteristics of high reliability, long service life, and low pollution index, and has broad development prospects. [0003] Specifically, the distribution cost of the DC side of the photovoltaic power generation system is inversely proportional to the DC side voltage within a certain range. Therefore, in order to reduce the system cost, the DC side voltage of the photovoltaic power generation system can be increased appropriately, such as increasing it to 1000V above. However, for the current common photovoltaic power generation systems, th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/36
CPCH02M1/36Y02E10/56
Inventor 杨文辉蔡子海陈保群王小飞
Owner EMERSON NETWORK POWER CO LTD
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