Spare power automatic switching programmable logic control method for plant supply of power station

Abstract

The invention discloses a spare power automatic switching programmable logic control method for a plant supply of a power station based on a fieldbus communication technology. In the method, an electric spacing layer fieldbus network 1 for the power station is adopted; and a main control unit acquires data of a comprehensive protection device and a measurement and control device on a spacing layer bus, so the spare power automatic switching function of a station-service power supply can be realized in the main control unit. By the method, the limitation of the conventional spare power automatic switching device is broken through, and the conventional spare power automatic switching device is saved. The whole logical configuration is more intuitional by using the parallel node communication function; as the data global share and the data quality take participation in the logic, the whole logic configuration is more flexible and convenient; therefore, the flexibility and the usability of the system are enhanced. The method has obvious advantages in the aspects of flexibility of realizing the station-service power supply backup switchover logic and saving of equipment investment.

Description

technical field [0001] The invention belongs to the technical field of electric power systems, and in particular relates to a method for realizing the automatic switch-on logic of power supply equipment in power plants. Background technique [0002] The self-switching function of the auxiliary power supply of the power plant occupies a very important position in the auxiliary power system of the thermal power plant. In the "Twenty-five Key Requirements for Preventing Major Accidents in Electric Power Production", it is clearly pointed out that it is necessary to prevent power outages in the whole plant to avoid serious consequences of unit loss of control and equipment damage. To prevent power outage accidents in the whole plant, it is particularly important to ensure that the logic function of the plant's power supply is automatically switched on. At the same time, according to the different wiring modes of different power plants and the different operating modes of each p...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of high cost, high engineering implementation intensity, and inflexible logic configuration of the special standby automatic switching device in the prior art, the present invention provides a fieldbus communication technology to realize the standby automatic switching of the power plant. The method of programmable logic, the method is to realize the programmable logic of power plant standby automatic switchover in the main control unit, instead of using a special standby automatic switchover device

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