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Fault handling in a DC power system

A power system and fault technology, applied in the field of DC power systems, can solve problems such as infeasible operation, and achieve the effects of reducing disturbance propagation, improving power system security, and reducing current stress

Active Publication Date: 2020-06-30
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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  • Fault handling in a DC power system
  • Fault handling in a DC power system
  • Fault handling in a 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

A fault handling arrangement in a DC power system (10) comprises a first fault handling unit (18) configured to, upon the detecting of a fault (F) of a first power line (L1) interconnecting a first converter (CONV 1) in a first converter station (12) with a second converter (CONV 2) in a second converter station (14) via a first line separating device (LS1) and a second line separating device (LS2), operate the first line separating device (LS1) with the second line separating device (LS2) to disconnect the first power line (L1) from the DC power system, operate at least one further line separating device (LS3) of the first converter station (12) for isolation from the DC power system (10), investigate if the fault (F) has been cleared, while power lines (L3) between the second converter station (14) and other converter stations (16) are operational, and operate the first line separating device (LS1) with the second line separating device (LS2) to reconnect the first power line (L1) and the at least one further line separating device (LS7) to again connect the first converter station to the DC power system (10) if the fault (F) has been cleared and otherwise disconnect the first power line and reconnect the first converter station (12) to the DC power system in case of permanent fault.

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 Applications(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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