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Low-voltage direct current distribution network protection control method and system

A technology of protection control and low-voltage direct current, which is applied in the direction of emergency protection circuit devices, electrical components, fault locations, etc., can solve problems such as difficulty in fault location, achieve the effects of improving sensitivity, real-time high-speed fault information exchange, and improving reliability

Active Publication Date: 2020-03-10
STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST +6
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Problems solved by technology

[0010] The technical problem to be solved by the present invention is that it is difficult to locate the fault after a fault occurs in the low-voltage DC distribution network. The present invention provides a protection control method and system for the low-voltage DC distribution network, which uses the parallel capacitor on the DC side of the converter to discharge the fault point at the moment of the fault Transient current, determine whether there is a fault through the differential calculation of the transient current, and realize the accurate judgment of the direction of the fault current through the integration of the transient current, and finally realize the judgment of the fault section through the information exchange between adjacent protection devices , and is not affected by network topology changes, has a good application prospect

Method used

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Embodiment Construction

[0040] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0041] figure 1 is a flowchart of a protection control method in a specific embodiment of the present invention;

[0042] figure 1 A low-voltage DC distribution network protection control method is shown, including the following steps:

[0043] Differentiate the DC current of each detection point collected in real time to obtain the current differential value ΔI fi ; Set the current differential value and current differential fault detection threshold I set1 are compared when ΔI fi > I set1 , it is judged that a fault has occurred;

[0044] When it is judged that a fault occurs, calculate the fault current integral value I of each detection point fi And determine the fault current direct...

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Abstract

The invention discloses a low-voltage direct current distribution network protection control method and system, wherein the method determines whether there is a fault through the differential calculation of the transient current, and realizes the accurate judgment of the direction of the fault current through the integration of the transient current, thereby avoiding interference such as noise The interference of the signal to the protection improves the reliability of the protection; finally, the judgment of the faulty section is realized through the information exchange between adjacent protection devices. This method is not affected by the change of the network topology and has a good application prospect.

Description

technical field [0001] The invention relates to the protection of a low-voltage direct current distribution network and belongs to the technical field of power system protection. Background technique [0002] Energy is the core issue related to economic and social development, and the efficient consumption of renewable energy is an effective means to solve energy problems. At present, most renewable energy sources, including photovoltaic power generation, wind power generation, solar thermal power generation, etc., are mostly connected to the AC power grid through multi-level conversion links. However, the existing DC loads such as DC charging piles and inverter air conditioners need to undergo AC-DC conversion to realize DC power supply. From the aspect of renewable energy utilization, multiple converter links reduce the utilization rate of renewable energy; from the aspect of DC load, the converter link increases the loss and reduces the efficiency. The DC distribution n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26G01R31/08
Inventor 袁宇波李娟黄强弓新月孔祥平高磊陈久林周建华
Owner STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST
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