Performance evaluating method and system for high-voltage direct-current (DC) power transmission system 100Hz protection

A technology of power transmission system and high voltage direct current, applied in the direction of direct current network circuit devices, electrical components, circuit devices, etc., can solve the problem that there is no complete and systematic method for evaluating the protection performance of direct current 100Hz, and reduce incorrect actions. , to ensure safe and stable operation, and to improve performance

Inactive Publication Date: 2013-08-28
CSG EHV POWER TRANSMISSION +1
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Problems solved by technology

[0003] At present, the research on DC 100Hz protection mainly focuses on the improvement of protection and the mutual coopera

Method used

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  • Performance evaluating method and system for high-voltage direct-current (DC) power transmission system 100Hz protection
  • Performance evaluating method and system for high-voltage direct-current (DC) power transmission system 100Hz protection
  • Performance evaluating method and system for high-voltage direct-current (DC) power transmission system 100Hz protection

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Embodiment

[0033] 1. The principle of performance evaluation method

[0034] In the AC-DC interconnected power grid, when the AC system fails, the valve fails, and the valve-based electronic equipment (VBE) fails, it may cause abnormal valve triggering, and a 100Hz component will appear in the DC current. For the abnormal valve triggering caused by VBE, it can be eliminated by switching the extreme control system. If there is still a 100Hz component in the DC current after switching the pole control system, the possibility of VBE failure can be ruled out, and the DC 100Hz protection section I will operate to reduce the power delivered by the DC system to take advantage of the recovery of the DC system. If the 100Hz component still exists after the power is reduced and is greater than the protection setting value, the DC 100Hz protection section II will act and block the DC to protect the safe and stable operation of the DC equipment and the AC system.

[0035] In actual engineering, the...

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Abstract

The invention discloses a performance evaluating method and system for high-voltage direct-current (DC) power transmission system 100Hz protection. The method comprises the following steps of: step 1, traversing and scanning asymmetric faults of an alternating-current (AC) electric network in an AC/DC interconnected network in which the high-voltage DC power transmission system stays, and determining an AC fault range influencing the DC 100Hz protection; step 2, determining a time boundary for the faults in the AC fault range, and also determining a delay constant value delta t of the DC 100Hz protection; and step 3, comparing the delay constant value delta t and an upper boundary t1, an upper boundary t2 and a shortest time t3, and evaluating the performance of DC100Hz protection. The system comprises a simulation module, a protection module and an evaluation module. The method and the system integrate the advantages of a short-circuit current calculation program and a PSCAD/EMTDC (power system computer aided design/electromagnetic transient simulation for DC) simulation computing program, fast recognition of the AC fault range influencing the DC 100Hz protection can be realized, and a simple, high-efficiency and practical engineering method is provided for evaluating the performance of DC100Hz protection.

Description

technical field [0001] The invention relates to the technical field of high-voltage power transmission, in particular to a performance evaluation method and system for 100 Hz protection of a high-voltage direct current power transmission system. Background technique [0002] With the development and application of HVDC transmission technology, the AC-DC interconnection grid is gradually formed. The coordination and cooperation of the relay protection of the AC system and the control and protection of the DC system are of great significance to ensure the safe and stable operation of the power grid. DC 100Hz protection is a typical protection function of the cooperation between AC and DC control and protection. It is set up to prevent the AC main protection from refusing to operate or the switch from malfunctioning, which poses a threat to the normal operation of the DC system or the safety of DC equipment. If the AC system fault cannot be removed or the removal time is too lo...

Claims

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Application Information

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IPC IPC(8): G06F19/00H02J1/00
Inventor 赵建宁王朝硕蔡泽祥李晓华张勇军杨欢欢
Owner CSG EHV POWER TRANSMISSION
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