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Troubleshooting in DC Power System

A power system, DC voltage technology, applied in the direction of power transmission AC network, electrical components, circuit devices, etc., can solve problems such as unfeasible operation, achieve the effects of reducing disturbance propagation, improving power system security, and improving system availability

Active Publication Date: 2021-07-13
HITACHI ENERGY SWITZERLAND AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, this type of operation is not feasible in direct current (DC) power systems where there is no current zero crossing

Method used

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  • Troubleshooting in DC Power System
  • Troubleshooting in DC Power System
  • Troubleshooting in DC Power System

Examples

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Embodiment Construction

[0040] Hereinafter, a detailed description of preferred embodiments of the present invention will be given.

[0041] figure 1Shown is a simplified multi-terminal direct current (DC) power system 10, such as a high voltage direct current (HVDC) power system, comprising at least two converters in corresponding converter stations connected to different direct current power lines, where each converter station is Connected to a plurality of DC power lines, at least one of which is a power line in a DC power system, and each connection is made through a line separation device. In the following examples, all DC power lines are power lines in a DC power system. However, as will be seen later, this is not always the case.

[0042] The exemplary power system 10 includes a first converter station 12 , a second converter station 14 , and a third converter station 16 . The first converter station 12 is interconnected with the second converter station 14 via a first power line L1. Here,...

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Abstract

The fault processing device in the DC power system (10) includes a first fault processing unit (18), the first fault processing unit (18) is configured to detect The first power line (L1) interconnecting the first converter (CONV1) in the first converter station (12) with the second converter (CONV2) in the second converter station (14) by the separating device (LS2) In the event of a fault (F), operate the first line separation device (LS1) and the second line separation device (LS2) to disconnect the first power line (L1) from the DC power system, and operate the first converter station (12) at least one further line separation device (LS3) for isolating the DC power supply system (10), while the power line (L3) between the second converter station (14) and the other converter stations (16) is running, Check if the fault (F) has been cleared, if the fault has been cleared, operate the first line splitting device (LS1) and the second line splitting device (LS2) to reconnect the first power line (L1) and at least one other line splitting device (LS7 ) to reconnect the first converter station to the DC power system (10), otherwise disconnect the first power line and connect the first converter station (12) to the DC power system in case of a permanent failure.

Description

technical field [0001] The present invention generally relates to a power system. More specifically, the invention relates to a method, a fault handling device and a computer program product for handling faults on a power line in a direct current power system, and the invention relates to such a direct current power system. Background technique [0002] Fault handling is an important aspect in power systems such as power delivery systems. [0003] In such systems, a fault may occur and subsequently clear without any activity by the system operator. This may be the case, for example, if the system includes overhead lines. [0004] Therefore, it is known to use circuit breakers with an automatic reclosing function. This circuit breaker is typically used on alternating current (AC) systems. In this case, a circuit breaker is used to disconnect the AC power line after a fault and then automatically reconnect after a certain predetermined duration. If the fault persists, the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H3/06H02H7/26H02J3/36
CPCH02H3/06H02H7/268H02J3/36Y02E60/60
Inventor V·坎南P·K·巴鲁帕蒂
Owner HITACHI ENERGY SWITZERLAND AG
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