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Methods and devices for controlling synchronous pre-synchronization and synchronization detection closing of microgrid

A control method and technology of a control device, which are applied in the field of microgrid and can solve problems such as poor effect of pre-synchronization in the same period

Pending Publication Date: 2019-04-09
BEIJING ETECHWIN ELECTRIC
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Problems solved by technology

[0006] An exemplary embodiment of the present invention is to provide a control method and device for synchronous pre-synchronization and detection synchronous closing of a microgrid, so as to solve the problem of poor synchronous pre-synchronization effect existing in the prior art

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  • Methods and devices for controlling synchronous pre-synchronization and synchronization detection closing of microgrid
  • Methods and devices for controlling synchronous pre-synchronization and synchronization detection closing of microgrid
  • Methods and devices for controlling synchronous pre-synchronization and synchronization detection closing of microgrid

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Embodiment Construction

[0049] Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like numerals refer to like parts throughout. The embodiments are described below in order to explain the present invention by referring to the figures.

[0050] figure 1 A flowchart showing a method for controlling synchronous pre-synchronization of a microgrid according to an exemplary embodiment of the present invention. Here, the microgrid includes a support power supply that provides voltage and frequency support for the bus bar of the microgrid; the support power supply includes a main support power supply, and the main support power supply includes a droop control mode or a constant voltage constant frequency DC / AC (direct current / alternating current) converter. The AC side of the main supporting power supply can be connected to the grid or connected to other micro grids.

[0051] As an example, the supporting po...

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Abstract

The invention provides methods and devices for controlling synchronous pre-synchronization and synchronization detection closing of a microgrid. The control method comprises the steps of: adjusting the voltage magnitude output by a main support power supply at a tracking side through iteration, so that the voltage magnitude at the tracking side successively approximates the voltage magnitude at areference side along with iteration till the absolute value of a difference value between the voltage magnitude at the tracking side and the voltage magnitude at the reference side is less than or equal to a first pre-set threshold value; adjusting the frequency output by the main support power supply at the tracking side through iteration, so that the frequency at the tracking side successively approximates the frequency at the reference side along with iteration till the absolute value of a different value between the frequency at the tracking side and the frequency at the reference side isless than or equal to a second preset threshold value; and, adjusting the phase output by the main support power supply at the tracking side through iteration, so that the phase at the tracking side successively approximates the phase at the reference side along with iteration till the absolute value of a different value between the phase at the tracking side and the phase at the reference side isless than or equal to a third preset threshold value, therefore, voltage synchronization of the tracking side and the reference side is realized.

Description

technical field [0001] The present invention generally relates to the technical field of micro-grids, and more specifically, relates to a micro-grid synchronization pre-synchronization control method and device, and a micro-grid detection synchronization control method and device. Background technique [0002] At present, the interface types of power generation equipment in AC microgrid mainly include power electronic interface types and synchronous generator interface types. Among them, the power electronic interface mainly refers to the direct current / alternating current (DC / AC) converter, [0003] Due to the flexible control strategy and quick response of the DC / AC converter itself, in the prior art, the phase-locked closed-loop control of the DC / AC converter itself is used to control the synchronous pre-synchronization of the microgrid of the power electronic interface type , but this synchronous pre-synchronization control method is only suitable for microgrids with on...

Claims

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Application Information

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IPC IPC(8): H02J3/40H02J3/38
CPCH02J3/381H02J3/40
Inventor 樊世军张卫周男
Owner BEIJING ETECHWIN ELECTRIC
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