Frequency modulation controller

Abstract

The invention discloses a frequency modulation controller, and relates to the technical field of electrical control. A third AND gate respectively receives system square waves and output signals of a first pulse shaping module, and a fourth AND gate respectively receives generator square waves and output signals of a second pulse shaping module. Output signals of a level detection module are conveyed to a pulse forming module. The output signals of the third AND gate and the output signals of the fourth AND gate are respectively conveyed to a second dual-steady-state trigger module, the output signals of the pulse forming module are conveyed to one input end of a fifth AND gate and one input end of a sixth AND gate respectively, and the other input end of the fifth AND gate and the other input end of the sixth AND gate respectively receive output signals of the second dual-steady-state trigger module. The output signals of the fifth AND gate and the output signals of the sixth AND gate respectively pass through a pulse broadening module to control a speed reduction and increase relay. The problem that in a quasi-synchronization automatic grid-connection device, frequency is prone to being adjusted excessively or being not adjusted in place can be solved.

Description

technical field [0001] The invention relates to the technical field of electrical control, in particular to a frequency modulation controller used for an automatic quasi-synchronization device for grid-connected hydropower stations. Background technique [0002] The quasi-synchronous paralleling of generators is a frequent daily operation of power plants. When the generators are put into parallel operation in the system, it is often accompanied by current shock and power shock, which will cause an instantaneous drop in the system voltage at the parallel point. If the operation is wrong and the inrush current is too large, the main shaft of the unit may be twisted and the winding wire of the generator may be deformed, torn, and insulation damaged. Serious asynchronous paralleling may cause unit and system accidents. The phase error of the traditional manual operation is large, and the precision of the traditional quasi-synchronous automatic grid-connection device based on the...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a frequency modulation controller, which can solve the problem that the frequency adjustment is prone to over-regulation or adjustment is not in place in the quasi-synchronous automatic grid-connected device

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