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Direct-current power grid feed-in protection device and control system thereof

A technology for DC power grids and protection devices, which is applied in the direction of DC network circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, emergency protection circuit devices, etc., which can solve the problem of large hardware cost investment, simple and practical control methods Low performance and other problems, to achieve the effect of improving maintenance efficiency, simple maintenance, and improving practicability

Pending Publication Date: 2022-04-26
智寰(北京)氢能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of high hardware cost, difficult maintenance, simple control mode and low practicability in the prior art, the purpose of the present invention is to provide a DC grid feed-in protection device and its control system

Method used

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  • Direct-current power grid feed-in protection device and control system thereof
  • Direct-current power grid feed-in protection device and control system thereof
  • Direct-current power grid feed-in protection device and control system thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Such as figure 1 As shown, this embodiment provides a DC grid feed-in protection device, including a positive DC one-way valve group and a negative DC one-way valve group, and the input end of the positive DC one-way valve group is connected to an external power supply device (or power generation device ), and the output end of the positive DC one-way valve group is connected to the DC positive line of the DC grid, and the output end of the negative DC one-way valve group is connected to the negative pole of the external power supply (or power generation equipment), and the negative pole DC one-way Connect the DC negative line of the DC grid to the input end of the valve group.

[0033] working principle:

[0034] 1) During normal operation, when the voltage of the power supply equipment is higher than the grid voltage of the DC power grid, the positive pole of the power supply equipment flows out DC current, flows into the input end of the positive DC one-way valve gr...

Embodiment 2

[0046] This embodiment is improved on the basis of Embodiment 1, and the technical features different from Embodiment 1 are as follows.

[0047] As preferred, such as figure 2 As shown, it also includes the main contactor KM1 with double-pole single-throw structure. The rated voltage of the main contactor KM1 is DC20kV and the rated current is 630A. The first end of the first pole of the main contactor KM1 is connected to the positive DC one-way valve group The output terminal of the first pole of the main contactor KM1 is connected to the DC positive line DC+ of the DC power grid, and the first end of the second pole of the main contactor KM1 is connected to the input end of the negative DC one-way valve group , and the second end of the second pole of the main contactor KM1 is connected to the DC negative line DC- of the DC power grid.

Embodiment 3

[0049] This embodiment is improved on the basis of Embodiment 2, and the technical features different from Embodiment 2 are as follows.

[0050] As preferred, such as image 3 As shown, it also includes line-side isolating switch QS1 and bus-side isolating switch QS2, both of which are double-pole-single-throw structures. The first end of the first pole of the side isolating switch QS1 is connected to the positive pole of the external power supply equipment, the second end of the first pole of the line side isolating switch QS1 is connected to the input end of the positive DC one-way valve group, and the line side isolating switch The first end of the second pole of QS1 is connected to the negative pole of the external power supply equipment, and the second end of the second pole of the line side isolating switch QS1 is connected to the output end of the negative DC one-way valve group;

[0051] The first end of the first pole of the bus-side isolating switch QS2 is connected...

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Abstract

The invention belongs to the technical field of protection devices, and discloses a direct-current power grid feed-in protection device and a control system thereof.The direct-current power grid feed-in protection device comprises a positive-pole direct-current one-way valve set and a negative-pole direct-current one-way valve set, and the input end of the positive-pole direct-current one-way valve set is connected with the positive pole of external power supply equipment; the output end of the positive direct-current one-way valve group is connected with a direct-current positive wire of a direct-current power grid, the output end of the negative direct-current one-way valve group is connected with a negative electrode of external power supply equipment, and the input end of the negative direct-current one-way valve group is connected with a direct-current negative wire of the direct-current power grid; the control system is based on a direct-current power grid feed-in protection device and comprises a voltage detection device, a current detection device, a control device and a remote communication device. The problems that in the prior art, hardware cost input is large, maintenance is difficult, the control mode is simple, and practicability is low are solved.

Description

technical field [0001] The invention belongs to the technical field of protection devices, and in particular relates to a DC grid feed-in protection device and a control system thereof. Background technique [0002] DC power grids mostly use protection devices with mechanical contacts. When a short circuit occurs, the voltage will drop to less than 10% for a period of more than 2ms. For many sensitive microgrid equipment, the 2ms ultra-low voltage process may cause downtime and production loss. For off-grid microgrids, the 2ms ultra-low voltage process may cause grid collapse. Therefore, in order to ensure the reliable operation of power grid equipment and microgrid, it is necessary to install a short-circuit protection device on the feed-in side of the DC power grid, and perform timely protection actions when a short-circuit fault occurs in the power supply equipment or generator set. [0003] Problems existing in the prior art: [0004] In the prior art, DC circuit brea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/02H02H9/04H02J1/00G01R31/52G01R31/00G01R19/00
CPCH02H9/02H02H9/04H02J1/00G01R31/52G01R31/00G01R19/00
Inventor 马永健
Owner 智寰(北京)氢能科技有限公司