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Method, relay and system for microgrid protection

A relay and micro-grid technology, applied in the field of micro-grid, can solve problems such as affecting the fault handling ability, and achieve the effect of excellent protection ability and accurate judgment.

Active Publication Date: 2019-06-04
BEIJING ETECHWIN ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

While conventional overcurrent protection relays can be used to protect microgrids operating in grid-connected mode of operation and non-islanded microgrids that are always physically connected to the main utility grid, the presence of distributed generators may affect The fault handling capability of the protection system of the overcurrent protection relay, so the traditional overcurrent protection relay must be adjusted systematically

Method used

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  • Method, relay and system for microgrid protection
  • Method, relay and system for microgrid protection
  • Method, relay and system for microgrid protection

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Embodiment Construction

[0035]Hereinafter, exemplary embodiments of the inventive concept will be described in more detail with reference to the accompanying drawings.

[0036] figure 1 A flowchart showing a method for protecting a microgrid according to an exemplary embodiment of the present invention.

[0037] Such as figure 1 As shown, the method for microgrid protection in this exemplary embodiment includes the following steps.

[0038] In step S110, a solid fault signal (Solid Fault Signal, SFS for short) is generated based on the input three-phase voltage. For example, a first coordinate transformation may be performed on the input three-phase voltage, and based on the result of the first coordinate transformation, it is determined whether a disturbance voltage is generated, and a solid-state fault signal is generated when a disturbance voltage is generated.

[0039] As an example, step S110 may include: transforming the input three-phase voltage into a voltage in a two-phase synchronous rot...

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Abstract

The invention provides a method, relay and system for microgrid protection. The method may include the steps of generating a solid-state fault signal based on an input three-phase voltage; generatinga high-impedance fault signal based on an input three-phase current; generating a direction signal based on the input three-phase voltage and three-phase current; and generating a trip signal based onthe solid-state fault signal, the high-impedance fault signal, and the direction signal. The method, relay and system for microgrid protection according to the invention can generate solid fault signals, high-impedance fault signals and direction signals according to three-phase voltages and three-phase currents to accurately determine faults, and can transmit fault information through the signals to quickly handle the faults, thereby providing fast and reliable protection for a microgrid.

Description

technical field [0001] The present invention relates to microgrid technology, and more particularly, to a method, relay and system for microgrid protection. Background technique [0002] The islanding mode of microgrid operation can be a mode in which the microgrid operates as a self-contained system independently of the main public grid. The main issues that arise in islanding mode relate to microgrid protection, such as overcurrent protection. In this operating mode, due to the limited current ratings of semiconductor switches used, for example, in converters of distributed generators, the fault current is relatively small, approximately twice the normal rated current. However, when the main utility grid generates a fault current in the grid connection operation mode, the generated fault current is relatively large to drive a conventional overcurrent protection relay. Therefore, such conventional overcurrent protection relays for relatively large fault currents are insuf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26
CPCH02H7/26H02J3/388
Inventor 郑德化阿比内特·特斯法耶·艾希
Owner BEIJING ETECHWIN ELECTRIC
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