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Method and device for bipolar blocking of high-voltage direct current transmission system jumping into island mode

A DC power transmission system and power transmission system technology, applied in emergency protection circuit devices, electrical components, etc., can solve the problems of small short-circuit current, weak AC system, poor island stability, etc., to increase output, reduce the number of power-on units, The effect of solving the problem of low-load operation in dry season

Inactive Publication Date: 2019-10-11
CHINA SOUTHERN POWER GRID COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the number of generators is reduced, once the AC connection line is disconnected, the DC transmission system will enter the island operation state. Due to the small number of generators in the island system, the short-circuit current of the island system is small, the AC system becomes weak, and the problem of AC overvoltage is prominent. Stability deteriorates. In order to prevent damage to the primary and secondary equipment in the island, once the DC transmission system jumps into the island operation under low load, it is necessary to immediately block the DC bipolar and stop the DC

Method used

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  • Method and device for bipolar blocking of high-voltage direct current transmission system jumping into island mode
  • Method and device for bipolar blocking of high-voltage direct current transmission system jumping into island mode
  • Method and device for bipolar blocking of high-voltage direct current transmission system jumping into island mode

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Embodiment 1

[0028] refer to figure 1 As shown, it is a flow chart of the method for jumping into the island mode bipolar blocking method for low-power operation of the HVDC power transmission system provided by this embodiment. Specifically, the method includes the following steps:

[0029] S1. Set the DC power threshold value of the DC transmission system, the switching delay value and the blocking delay value of the DC station control system of the DC transmission system in the HMI (human-machine interface), and set the switching delay value and the blocking delay value The value can effectively prevent the misoperation of the DC station control system; among them, the DC power transmission system is equipped with two sets of DC station control systems, which are the main DC station control system and the backup DC station control system, and the DC station control The DC station control system is an existing technology. In the initial state, the DC station control system is mainly used...

Embodiment 2

[0036] refer to image 3 As shown, this embodiment also provides a bipolar blocking device for jumping into an island mode during low-power operation of the HVDC transmission system, see image 3 As shown, the device includes:

[0037] The setting unit includes a power setting module for setting the DC power threshold value of the DC power transmission system, a switching delay setting module for setting the switching of the DC station control system of the DC power transmission system, and a switching delay setting module for setting the DC power threshold of the DC power transmission system. The blocking delay setting module of the DC bipolar blocking of the power transmission system; wherein, the DC transmission system is equipped with two sets of DC station control systems, respectively the main DC station control system and the backup DC station control system, and the main DC station control system Both the system and the standby DC station control system are existing t...

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Abstract

The invention discloses a bipolar shunting method and device of an existing high-voltage DC power transmission system in island running. The method comprises the following steps of S1, setting a DC power threshold value of the DC power transmission system and a switching delay value and a shunting delay value of a DC station control system of the DC power transmission system; S2, detecting whetheran AC contact circuit is broken or not, and entering the step S3 if the AC contact circuit is broken, the bipolar DC total power value of the DC power transmission system is lower than the DC power threshold value set by the step S1 and time reaches the switching delay value set by the step S1; and S3, switching the DC station control system of the DC power transmission system to an emergency DCstation control system from a main DC station control system, and achieving DC bipolar shunting of the DC power transmission system when the time after switching is succeed reaches the shunting delayvalue set by the step S1, wherein the DC power transmission system stops running. By the method, the high-voltage DC power transmission system can trip to bipolar shunting under the island mode from low-power running.

Description

technical field [0001] The invention relates to the technical field of electric power systems, in particular to a bipolar blocking method and device for jumping into an island mode during low-power operation of a high-voltage direct current transmission system. Background technique [0002] The generators of hydropower stations are in the low-load operation state for a long time during the dry season, and the generators may have been operating in the vibration zone, which will cause defects of varying degrees in the generators and workshops. In view of the vibration problems of hydroelectric generating units and workshops exposed to the low-load operation of hydropower stations, it is necessary to reduce the number of machines to be started and increase the output of the units during the dry season to keep the units out of the vibration zone. However, when the number of generators is reduced, once the AC connection line is disconnected, the DC transmission system will enter ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26
Inventor 周剑谢惠藩梅勇黄河刘洪涛徐光虎
Owner CHINA SOUTHERN POWER GRID COMPANY
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