Power supply fast switching method and system

Abstract

The invention provides a power supply fast switch method and system. The power supply fast switch method comprises the following steps: step A, a switch starting signal transmitted from a switch starting judgment module is received; step B, whether fast switch conditions are met or not is judged, if yes, switch operation is performed, and if not, a step C is executed. The power supply fast switch method and system have the advantages that through mutual cooperation of all segments of a fast switch device and cooperation between a joint switch function and a fast switch function, the fast switch device can be adapted to various complex bus load conditions, and a better switch effect can be achieved; besides, when fast switch switching-on is judged, a current phase difference is replaced by a switching-on phase difference for judgment, as a result, the switching-on phase difference is accurately controlled to be within a permissible value range, the switch operation is faster and safer, and a device is protected against damage.

Description

technical field [0001] The invention relates to the field of power supplies, in particular to a method and system for fast switching of power supplies. Background technique [0002] Generally speaking, the closing criterion of the commonly used fast switching mode is: Δθ<Δθ set And Δf<Δf set . In the above formula, Δθ is the current phase difference between the attenuated bus residual voltage and the backup power supply voltage, Δθ set is the fixed value of the phase difference, Δf is the current frequency difference between the attenuated bus residual voltage and the backup power supply voltage, Δf set Set the value for the frequency difference. This closing criterion is based on the fact that the current phase difference Δθ is less than a certain value Δθ set , so as to judge whether the fast switching condition is met, but there is still a short period of time from the closing command of the fast switching device to the moment when the switch is actually closed...

AI Technical Summary

Problems solved by technology

[0004] When the load of the busbar is relatively complex, for example, when it includes generators, synchronous motors, and asynchronous motors at the same time, due to the large differences in the closing phase difference, frequency difference, and voltage difference allowed by various loads, if the "fast switching + synchronous If "capture switch" does not have "real-time fast switch", the asynchronous motor will not be able to quickly supply power if "fast switch" fails and cannot enter "real-time fast switch"; if "fast switch + real-time fast switch + synchronous capture switch" is adopted Without the "joint cut function", it will also cause the bus load to be complex and unable to take into account various loads

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