Manual and automatic quasi-synchronous grid connection method and device suitable for conventional and digital stations

Abstract

The invention discloses a manual-automatic integrated quasi-synchronized connection method and device applicable to conventional and digital stations. According to the method and the device, acquisition of digital and conventional analog voltage signals and switching signals can be realized, and after processing and computing of acquired data, a voltage difference, a frequency difference and a phase angle difference are reflected to a synchronizing dial plate. In a manual mode, a switch-on instruction is output through the digital quantity and a relay when the voltage difference, the frequency difference and the phase angle difference are in predetermined ranges and a switch-on switching signal is detected; in an automatic mode, the switch-on instruction is output through the digital quantity and the relay according to set leading time when switch-on conditions are met. Single functions of the conventional dial plate and quasi-synchronized connection device are improved, the requirements of an operator for manual and automatic quasi-synchronization are kept, the method and the device can meet the functional requirements of conventional stations, digital stations and conventional and digital mixed stations, and workload of operation and maintenance workers is reduced.

Description

technical field [0001] The invention belongs to the technical field of power systems, and relates to a quasi-synchronous grid-connection method for synchronous grid-connection of power systems, in particular to a manual-automatic quasi-synchronous grid-connection method and device applicable to both conventional and digital stations. Background technique [0002] Synchronous grid-connection operations are often encountered in power systems, such as synchronous grid-connection of generator sets and power grids, parallel operation of substation busbars and lines, etc. Improper operation of grid connection during the same period will cause serious damage to the generator, and even affect the stable operation of the grid. In order to ensure the smooth progress of grid-connected operations during the same period, the more common methods are: [0003] (1) The operator manually completes the synchronization process with the help of various instruments in combination with relevant ...

AI Technical Summary

Problems solved by technology

[0013] The purpose of the present invention is to propose a manual and automatic quasi-synchronous grid-connection method and device adapted to conventional and digital stations, improve the single function of the existing instrument panel and quasi-synchronous grid-connection device, and retain the operator's need for manual and automatic synchronization. Quasi-synchronization requirements, solve the problem of simultaneous acquisition of digital and analog quantities and data synchronization processing, so as to adapt to the functional requirements of conventional stations, digital stations, conventional and digital hybrid stations, and reduce the workload of operation and maintenance personnel

Images