A safety control method and system for suppressing continuous commutation failure of a DC system

A technology for commutation failure and DC system, applied in the field of suppressing continuous commutation failure of DC system

Active Publication Date: 2021-07-06
ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is currently a lack of a suppression method specifically for the continuous commutation failure of the DC system, and the corresponding control of the DC system is carried out from the essence of the continuous commutation failure, so as to avoid the process of the DC system from deteriorating from the continuous commutation failure to DC blocking, and realize the entire power system. The system operates safely and stably without causing any regional power grid accidents

Method used

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  • A safety control method and system for suppressing continuous commutation failure of a DC system
  • A safety control method and system for suppressing continuous commutation failure of a DC system
  • A safety control method and system for suppressing continuous commutation failure of a DC system

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[0087] When the stable control system detects that the DC does not fail and detects the reverse side shunt bus voltage dropped to 0.9PU or less and maintains 60 ms, turn on the DC power modulation method, performs speed reduction, reducing DC modulation power; until detection The inverter side shifting bus voltage rises to 0.8pu or more and maintains 60 ms, DC power speed drop exits, rapid power recovery, and continuous phase failure fault risk. The specific DC power adjustment range is determined based on the operating state of the power grid before the fault, the direct flow rate reduction power value is greater than the receiver system in a strong AC state when the receiving system is in a weak AC state before the fault occurs.

[0088] The method of determining the speed reduction value of DC power is as follows:

[0089] Short-circuit ratio is an important parameter reflecting the intensity of the acceptance terminal. DC system short circuit ratio (SCR) is defined as follows:...

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Abstract

The invention discloses a safety control method and system for suppressing continuous commutation failure of a DC system, including a DC safety and stability control master station, a rectification and commutation control subsystem, and an inverter side state detection subsystem. Based on the commutation failure mechanism, through The number of commutation failures in the DC system and the commutation bus voltage on the inverter side are detected, and the DC power is rapidly reduced, thereby realizing the suppression of continuous DC commutation failures. The present invention can still reduce the risk of continuous commutation failure in the weak AC state of the receiving end power grid, can effectively prevent the continuous commutation failure of the DC system, and improve the safety and stability of the AC-DC hybrid system.

Description

Technical field [0001] The present invention relates to the field of power system control, and more particularly to a safety control method and system that suppresses the continuous phase failure of DC systems in a weak AC state of the DC terminal system after AC failure. Background technique [0002] Global Energy Internet Construction proposes high-capacity, long distance, and cross-regional requirements for energy transfer, how to improve the power network transport capacity, and improve the operational efficiency to become a problem in power delivery. The high-voltage DC transmission has the advantages of low cost, small line loss, fast adjustment speed, and is an important technique that effectively solves the above problems, so it has been vigorously developed. Today, more than 100 high-voltage DC power transmission systems have been installed around the world. It is estimated that by 2020, my country will build 15 special high-voltage DC transmission projects, and become t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36H02M7/00
CPCH02J3/36H02M7/00Y02E60/60Y04S10/52
Inventor 马欢杨冬麻常辉雷鸣张鹏飞赵康刘文学周宁曹永吉卢奕张志轩房俏李山陈博邢鲁华蒋哲
Owner ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY
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