Optimal configuration method for fault current limiters

Abstract

The invention discloses an optimal configuration method for fault current limiters. An area with high risk of failure in simultaneous phase commutation is judged by using a multi-infeed DC interactionfactor. During the configuration of an SRFCL device, the average electrical distance from a current limiting node to the DC converter stations in the area with high risk of failure in simultaneous phase commutation is calculated, and the priority of the current limiting node is determined to avoid large-range search. Meanwhile, the suppression effect of SRFCL on DC commutation failure is considered. Therefore, an SRFCL optimal configuration scheme taking both short-circuit current limiting and commutation failure suppressing into account is realized. The method is helpful for power system planners to grasp the influence of SRFCL installation and configuration on the phase commutation failure of a multi-infeed DC system and visually determine an SRFCL installation area. The indexes in thearea can be displayed in order during calculation. The method is easy to implement. Decision support is provided for the optimal configuration method of SRFCL in the multi-infeed DC system.

Description

technical field [0001] The invention relates to an optimal configuration method of a fault current limiter, which belongs to the technical field of power systems and automation thereof. Background technique [0002] In response to the increasing short-circuit current level of the system, the fault current limiter has an impedance close to zero during normal operation and has no adverse effects on the power grid. When a short-circuit fault occurs in the power grid, the impedance quickly increases to limit the short-circuit current, thereby ensuring that the circuit breaker can reliably cut off the fault. The circuit and other characteristics have become a new type of short-circuit current limiting device that has been studied more. However, due to the high cost of the ultra-high voltage fault current limiter, the optimal configuration of the fault current limiter has become a research hotspot. However, in the load center area, not only the problem of excessive short-circuit ...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art, provide an optimal configuration method for the fault current limiter, and solve the problem that the fault factors in the optimal configuration method for the fault current limiter in the prior art are not fully considered and cannot suppress the multi-infeed DC converter. phase failures, technical issues affecting power system stability

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