Power grid state detection method, device and static transfer switch cabinet

A technology of power grid status and detection method, applied in substation/distribution device casing, fault location, fault detection according to conductor type, etc., to achieve the effect of power grid status detection

Active Publication Date: 2017-05-31
SUNGROW POWER SUPPLY CO LTD
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  • Abstract
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  • Application Information

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Problems solved by technology

At present, the research in these two directions is relatively mature, but the analysis of the grid state detection of the grid-connected inverter with voltage source drooping characteristics is still relatively small, and there is almost no relevant information that can be used for reference.

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  • Power grid state detection method, device and static transfer switch cabinet
  • Power grid state detection method, device and static transfer switch cabinet
  • Power grid state detection method, device and static transfer switch cabinet

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Embodiment Construction

[0059] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0060] The invention provides a grid state detection method to provide a grid state detection scheme for a grid-connected inverter with voltage source droop control characteristics.

[0061] Specifically, the power grid state detection method, see figure 1 ,include:

[0062] S101. Calculate the active power and reactive power of the load according to the collected values ​​of the load terminal current and voltage sent by the load terminal sampling device;

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Abstract

The invention provides a power grid state detection method, device and static transfer switch cabinet, applying to a voltage source droop control feature grid-connected inverter. Firstly, sending the current acquisition value and the voltage acquisition value in the load-end by a load-end sampling apparatus, and according to the droop control feature and the droop parameter setting value issued by the controller, then calculating frequency and calculating voltage in the load-end are calculated; Then judging whether the difference value between the calculating frequency and the frequency acquisition value in the load-end is less than the first preset difference or not, and whether the difference value between the calculating voltage and the voltage acquisition value in the load-end is less than the second preset difference or not; If the difference values are all less than the preset differences, the power grid state of the grid-connected inverter is determined as tripping power-losing for the power grid; If not, the power grid state of the grid-connected inverter is determined as normal power supply for the power grid; In this way, the state detection of the voltage source droop control feature grid-connected inverter is achieved.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a grid state detection method, device and static switch cabinet. Background technique [0002] In the application field of grid-connected inverters, since the current source grid-connected inverter does not control the port voltage during the normal grid-connected process, after the grid is powered off, the ports of the current-source grid-connected inverter in the non-island state The voltage will be abnormally distorted, so the power grid failure state can be detected conveniently. [0003] However, for grid-connected inverters with voltage source droop control, after the grid loses power, the port voltage will continue to maintain the grid state before the trip. Permanent power grid failure detection. [0004] At present, the relevant technologies of grid-connected inverters with voltage source droop control characteristics basically focus on the analysis and impro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08H02B1/30
CPCG01R31/086H02B1/30
Inventor 江涛陶磊邹海晏叶亮
Owner SUNGROW POWER SUPPLY CO LTD
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