Direct current microgrid fault current controller and control method thereof

A fault current and DC micro-grid technology, applied in the field of electric power, can solve problems such as poor current limiting effect and poor controllability, and achieve the effect of realizing size, solving poor controllability, and strong controllability

Pending Publication Date: 2022-01-18
GUANGDONG ELECTRIC POWER SCI RES INST ENERGY TECH CO LTD
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The application provides a DC microgrid fault current controller and its control method, which are used to solve the technical problems of poor current limiting effect and poor controllability in the prior art

Method used

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  • Direct current microgrid fault current controller and control method thereof
  • Direct current microgrid fault current controller and control method thereof
  • Direct current microgrid fault current controller and control method thereof

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Embodiment Construction

[0033] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiment of the application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiment of the application. Obviously, the described embodiment is only It is a part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

[0034] see figure 1 , a DC microgrid fault current controller provided in an embodiment of the present application, comprising: a first switching tube, a second switching tube, an energy storage element, and a capacitor;

[0035] The collector of the first switching tube is connected to the positive pole of the energy storage element, the emitter of the first swit...

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Abstract

The invention discloses a direct-current micro-grid fault current controller and a control method thereof. The controller comprises a first switch tube, a second switch tube, an energy storage element and a capacitor; a collector of the first switch tube is connected to a positive electrode of the energy storage element, an emitter of the first switch tube is connected to a collector of the second switch tube, and an emitter of the second switch tube is connected to a negative electrode of the energy storage element; and the first end of the capacitor is connected between the first switch tube and the second switch tube, and the second end is connected to the emitter of the second switch tube. During normal operation, the interelectrode voltage is rated voltage, the current change is small, the control duty ratio is the first duty ratio, and constant voltage control is performed at the moment. When the interelectrode voltage is smaller than a preset threshold value, it is judged that a fault occurs, the duty ratio is switched into a second duty ratio, and constant current control is changed. After the fault is cleared, the interelectrode voltage rises, the duty ratio is switched into the first duty ratio, and the constant voltage control mode is recovered. The technical problems of poor current limiting effect and poor controllability in the prior art are solved.

Description

technical field [0001] The present application relates to the field of electric power technology, in particular to a DC microgrid fault current controller and a control method thereof. Background technique [0002] Due to the small coverage area of ​​the micro-grid, short power supply lines, and low line impedance, under the joint action of multiple distributed power sources, the short-circuit current of the DC micro-grid rises rapidly and has a large amplitude, which will cause serious impact on the system. In order to ensure the safe operation of the system, a simple and cheap overcurrent suppression method should be considered as much as possible to ensure the safe operation of the equipment. [0003] The fault current suppression method currently used in engineering is mainly to configure a current-limiting reactor, which uses the characteristic that the inductive current cannot change suddenly to limit the rising speed of the fault current. The disadvantage is that it i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26H02H3/06
CPCH02H7/268H02H3/066
Inventor 高滢曾杰陈锐张弛黄辉
Owner GUANGDONG ELECTRIC POWER SCI RES INST ENERGY TECH CO LTD
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