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A substation overcurrent protection method, device and system

A technology of protection devices and power electronic devices, which is applied in the direction of emergency protection circuit devices and electrical components, and can solve problems such as time coordination and increased scope of substation fault influence

Active Publication Date: 2019-07-02
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And when cooperating with conventional protection, it overcomes the problem of time coordination between power electronic devices and conventional protection, and avoids the defect that the protection cannot meet the selectivity, which increases the influence range of substation faults

Method used

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  • A substation overcurrent protection method, device and system
  • A substation overcurrent protection method, device and system
  • A substation overcurrent protection method, device and system

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0034] A substation overcurrent protection method provided by an embodiment of the present invention, such as figure 1 As shown, the method includes:

[0035] S1, to obtain the current line current value. The current line current value is obtained by the current value acquisition module, which may be integrated in the power electronic device, or may be a current acquisition device connected to the power electronic device.

[0036] S2, judging whether the current value reaches a preset first protection threshold. If it is not reached, go to step S1 and continue to detect the current line current value; if it is reached, go to step S3, the first protection threshold is between the rated current value of the power electronic device and the safe current threshold, specifically, the first protection threshold The threshold can be calculated by the following formula: I 1 +(I 2 -I 1 )*a, where, I 1 is the rated current value of the power electronic device, I 2 The safety thres...

Embodiment 2

[0045] A substation overcurrent protection device provided by an embodiment of the present invention, figure 2 A schematic structural diagram of the device is shown, including: a current value acquisition module 1 , a control module 2 , a judging unit 21 , a processing unit 22 , a first processing subunit 221 and a second processing subunit 222 .

[0046] Wherein, the current value obtaining module 1 is used to obtain the current value of the current line;

[0047] The control module 2 includes: a judging unit 21 and a processing unit 22, wherein the processing unit 22 includes a first processing subunit 221 and a second processing subunit 222;

[0048] A judging unit 21, configured to judge whether the current value reaches a first protection threshold, and the first protection threshold is located between the rated current value of the power electronic device and the safe current threshold of the power electronic device;

[0049] The processing unit 22 is configured to red...

Embodiment 3

[0054] Correspondingly, an embodiment of the present invention also provides a substation overcurrent protection system using the above substation overcurrent protection device, such as image 3 As shown, it includes: a substation 1, a power electronic device 2, a protection device 3, a current value detection device 4, a control device 5 and a current acquisition device 6;

[0055] Among them, the power electronic device 2 is installed in the substation 1, the protection device 3 is connected to the line of the substation 1, the current value detection device 4 detects the current value of the current line, and the current value acquisition device 6 obtains the current value of the current line.

[0056] Specifically, the current value detection device 4, the current value acquisition device 6, and the control device 5 can be integrated in the power electronic device 2, or the current detection device 4, the current value acquisition device 6, the control device 5 and the powe...

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Abstract

The invention discloses an overcurrent protection method, device and system for a substation. When a line is broken down, control on the magnitude of short-circuit current is achieved through in-station power electronic equipment. The method comprises the steps of obtaining a current value of a current line; judging whether the current value of the current line reaches a first protection thresholdor not, wherein the first protection threshold is located between a rated current value of the power electronic equipment and a safe current threshold of the power electronic equipment; if the current value of the current line reaches a preset first protection threshold, reducing an output voltage value of the current line and making the current value of the current line not exceed the first protection threshold; and when the protection is matched with conventional protection, controlling the output voltage value of the current line and making the current value of the current line greater than a second protection threshold but not exceed the first protection threshold, thereby driving the protection device to execute a protection action within protection reaction time, wherein the secondprotection threshold is the current value of a reliable action of the protection device and the second protection threshold is smaller than the first protection threshold.

Description

technical field [0001] The invention relates to the technical field of power system automation, in particular to a substation overcurrent protection method, device and system. Background technique [0002] The substation is an indispensable and important part of the power system. It consists of transformers, switchgear for opening and closing circuits, busbars for collecting current, transformers for measurement and control, instruments, relay protection devices, lightning protection devices, and dispatching communication devices. Equipped with various devices such as reactive power compensation equipment and high impedance equipment, it plays the role of power facilities for transforming voltage, receiving and distributing electric energy, controlling power flow and adjusting voltage in the power system. [0003] With the development of power electronics technology, power electronic devices have been widely used in substations. Because power electronic devices are affected ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/22
Inventor 赵国亮邱宇峰邓占锋王志凯刘海军才志远
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD