Closing control method of high-voltage DC breaker

Abstract

The invention provides a closing control method of a high-voltage DC breaker. Disconnecting valve blocks of a disconnecting branch are closed one by one, an on-state branch is closed, and all the disconnecting valve blocks of the disconnecting branch are disconnected. In the process that the disconnecting valve blocks of the disconnecting branch are closed one by one, whether a fault occurs in a line is detected after that the present disconnecting valve block is closed; if NO, the next disconnecting valve block is closed till all the disconnecting valve blocks are connected; and if YES, all the closed disconnecting valve blocks are disconnected, closing operation is ended, and fault information is reported. Controlled charging of the line can be realized in the DC breaker closing process, and overvoltage generated by closing operation is reduced.

Description

Technical field

[0001] The invention relates to a closing control method of a high-voltage DC circuit breaker and belongs to the technical field of circuit breakers. Background technique

[0002] Flexible DC transmission uses voltage source converters, which can independently and quickly control active power and reactive power, thereby improving the stability of the system, suppressing fluctuations in system frequency and voltage, and improving the steady-state performance of the grid-connected AC system. With the increasing depletion of fossil energy and increasing pressure to improve the environment, China and the world are facing strategic adjustments to the energy structure, and large-scale development and utilization of new energy is imperative.

[0003] As flexible DC transmission develops towards higher voltage and larger capacity, flexible DC transmission is applied to overhead line transmission to achieve the objective requirements of optimal allocation of energy re...

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