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Digital twinning pilot protection method for direct current power grid

A technology of DC power grid and DC transmission line, applied in the direction of power transmission AC network, emergency protection circuit device, electrical components, etc., can solve the problem that the reliability and quickness of the flexible DC grid are difficult to balance, and achieve high quickness, The effect of increasing quickness and increasing reliability

Active Publication Date: 2021-07-16
BEIJING JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The invention provides a DC power grid digital twin longitudinal protection method to solve the contradiction that the reliability and quickness of the existing flexible DC power grid protection are difficult to balance

Method used

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  • Digital twinning pilot protection method for direct current power grid
  • Digital twinning pilot protection method for direct current power grid
  • Digital twinning pilot protection method for direct current power grid

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Embodiment

[0060] Digital twin refers to building a mathematical model that can represent the physical object by collecting equipment data, and comparing the difference between engineering design and mathematical model to better understand theoretical design and actual production, and ultimately strengthen the understanding of the entire life cycle of equipment. effective management. Digital twins have become a hot spot in the industrial field in recent years, and have been applied in many fields such as high-end manufacturing, aerospace, and instrumentation. In the field of power systems, preliminary explorations have been made, and there are some architectures and modules of power system digital twins. However, there is no application of digital twin technology in the field of power system relay protection.

[0061] figure 1 A schematic flow chart of a DC power grid digital twin longitudinal protection method provided in this embodiment, refer to figure 1 , the method includes:

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Abstract

The invention provides a digital twinning pilot protection method for a direct current power grid. The method comprises the following steps: establishing a digital twinning model in a time domain of a direct-current power transmission line; establishing a system measurement equation according to the digital twinning model and the measurement quantity and the state quantity of the direct-current power transmission line; according to the system measurement equation, adopting a state estimation method to obtain an optimal estimated state quantity; and judging whether to take a protection action or not according to the optimal estimated state quantity. The method is not influenced by a transition resistance and has a good endurance capability; good lightning stroke interference resistance and noise resistance are realized; and an action speed is high, and the requirement of 3ms protection action of the current flexible direct current system can be met.

Description

technical field [0001] The invention relates to the technical field of direct current power grids, in particular to a digital twin longitudinal protection method for direct current power grids. Background technique [0002] With its advantages of flexible control, convenient networking and no commutation failure, flexible DC has been widely used in multiple scenarios such as new energy grid connection, island power transmission, and asynchronous networking, and has a good development prospect. However, the contradiction between the weak DC overcurrent capability and the rapid rise of DC fault current requires DC protection to isolate the fault in a very short time. With the acceleration of the construction of flexible DC grids, how to quickly, reliably and selectively identify DC line faults is an urgent problem to be solved in the existing technology. It has become an urgent need for flexible DC grids to propose a protection principle that takes into account both quickness ...

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Application Information

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IPC IPC(8): H02H7/26H02J3/36
CPCH02H7/268H02J3/36Y02E60/60
Inventor 李猛和敬涵聂铭王小君许寅张大海罗国敏
Owner BEIJING JIAOTONG UNIV