Method and device for identifying relation between guide vane opening and servomotor stroke of water turbine

Abstract

The invention discloses a method and device for identifying the relation between the opening degree of a guide vane of a water turbine and the stroke of a servomotor, and the method comprises the steps: obtaining the active power of a water-turbine generator set under different servomotor strokes through a real machine test, and carrying out the conversion processing of a constructed servomotor stroke and active power curve, obtaining a relation between servomotor stroke and water turbine unit torque; according to the comprehensive characteristic curve of the water turbine model, water turbine torque characteristic curves under different guide vane opening degrees are obtained, interpolation processing is conducted on the water turbine torque characteristic curves, and the relation between the guide vane opening degrees and the water turbine unit torque is obtained; and according to the relation between the servomotor stroke and the water turbine unit torque and the relation between the guide vane opening and the water turbine unit torque, the relation between the guide vane opening and the servomotor stroke is obtained. According to the method, real machine testing and model comprehensive characteristic curve calculation are adopted, the accurate relation between the guide vane opening degree and the servomotor stroke can be rapidly, simply and conveniently obtained, and accurate boundary conditions are provided for modeling simulation of an adjusting system.

Description

technical field [0001] The invention relates to the technical field of water turbines, in particular to a method and device for identifying the relationship between the opening of a water turbine guide vane and the stroke of a servomotor. Background technique [0002] With the construction of a new type of power system in my country, after large-scale new energy is integrated into the power grid, the pressure of peak regulation and frequency regulation of the power grid will increase. Conventional hydroelectric generating units have the characteristics of flexible adjustment and quick response. The safety and stability of the power grid under the system and the digestion and absorption of new energy are of great significance. The core of the water turbine is the water turbine governor. The water turbine governor outputs the target adjustment value of the guide vane opening after collecting the stroke signal of the servomotor and then drives the guide vane servomotor through e...

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Problems solved by technology

[0004] Based on this, the present invention provides a method and device for identifying the relationship between the opening of the guide vane of the hydraulic turbine and the stroke of the servomotor, to solve the problem of using on-site measurement of the stroke of the servomotor and the opening of the guide vane, requiring shutdown for maintenance, time-consuming and labor-intensive, and poor measurement accuracy. low problem

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