Switch turn-on controller

Abstract

The invention discloses a switch turn-on controller, and relates to the technical field of electrical control. The switch turn-on controller comprises a first shaping module and a second shaping module, wherein the first shaping module is used for receiving the sine wave voltage of an electric generator and conducting shaping on the sine wave voltage, and the second shaping module is used for receiving the sine wave voltage of a power grid and conducting shaping on the sine wave voltage. Square signals outputted by the first shaping module and the second shaping module respectively pass through a phase-sensitive module and are then inputted to a low-pass filtering module. The low-pass filtering module outputs triangular wave signals to a proportional differential module and a leading phase angle level detection module respectively. The output end of the proportional differential module is connected with the input end of a leading time level detection module. A logic module serves as an output module. The two input ends of the logic module receive a signal outputted by the leading time level detection module and a signal outputted by the leading phase angle level detection module respectively. The switch turn-on controller solves the problem that an on-off controller in a quasi-synchronization automatic grid connection device can not be automatically locked when the frequency difference is large, and a wrong instruction is easily sent.

Description

technical field [0001] The invention relates to the technical field of electrical control, in particular to a switch closing controller for an automatic quasi-synchronization device for hydroelectric power station grid connection. Background technique [0002] 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 grid 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 accidents between the unit and the power grid. The phase error of the traditional manual operation is large, and the precision of the traditional quasi-synchronous automatic grid-connection device base...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a switch closing controller, which can solve the problem that the switch controller in the quasi-synchronous automatic grid connection device cannot be automatically locked when the frequency difference is large, and it is easy to issue wrong commands

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