A power grid access defense method of a magnetic circuit control type fault current limiter

Abstract

The invention discloses a power gridaccess defense method of a magnetic circuit control type fault current limiter, which comprises three layers of defense including local defense, emergency defense and power grid defense; local defense: by configuring a fault current limit protection device, that protection device can ensure that after a magnetic circuit-controlled fault current limiter fail, theprotection device can isolate a fault through a bypass circuit breaker closing or a line circuit breaker tripping to remove the fault; Emergency prevention means that the line protection device and the safety and stability control device switch the operation setting value and the operation criterion according to the fault current limiter state to ensure that the control measures of the power network are not mismatched; At that same time, the fault current limit protection device sends the fault current limit state information to the D5000 system, and the grid dispatcher adjusts the grid operation mode accord to the anticipated strategy to form the grid defense, so as to ensure the safe and reliable operation of the grid after the line is cut off. The invention improves the adaptability ofthe power network control measures after the fault current limiter equipment is faulty, and further supports the actual large power network application of the magnetic circuit control type fault current limiter.

Description

technical field [0001] The invention relates to a grid access defense method for a magnetic circuit control type fault current limiter, which belongs to the technical field of electric power system automation control. Background technique [0002] With the continuous development of UHV AC and DC power grids, the grid structure of power systems tends to become more complex. The installed capacity of the power grid is gradually increasing and the transmission power of the cross-regional interconnection grid is increasing. The short-circuit current in the system is constantly increasing, and the operating margin of the circuit breaker is continuously decreasing. In some areas, the short-circuit circuit even exceeds the breaking capacity of the circuit breaker. Faults lead to the expansion of the scope of the accident and threaten the safe and stable operation of the power grid. Therefore, effective measures must be taken to reduce the short-circuit current. [0003] The tradit...

AI Technical Summary

Problems solved by technology

However, at present, the lack of understanding of the reliability of fault current limiters, how to defend against abnormalities, and the impact on the safe and stable operation of the power grid are unclear, which limits the practical application of large power grids

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