Key phase pulse acquisition method and system and generator rotating speed calculation method and system

The invention belongs to the technical field of power system automation, and particularly relates to a key-phase pulse acquisition method and system and a generator rotating speed calculation method and system.The method comprises the steps that key-phase pulse sampling data corresponding to the maximum amplitude in each key-phase pulse period is counted, and a set of maximum-amplitude pulse sampling data is obtained; determining an envelope line of the key phase pulse sampling data according to the maximum amplitude pulse sampling data; determining an interference pulse in the key phase pulse sampling data by using the envelope line to obtain effective key phase pulse data and interference key phase pulse data; solving the minimum amplitude of the pulse signal in the effective key phase pulse data, wherein the reference voltage value is k times of the reference voltage value; and comparing the key phase pulse sampling data with a reference voltage value to filter interference key phase pulse data, and output