Air-supplementing pressurized-water control method for phase modulation of water-turbine generator set

Abstract

The invention discloses an air-supplementing pressurized-water control method for the phase modulation of a water-turbine generator set. An electromagnetic valve arranged on a pipeline and controlling convey of compressed air to a runner chamber in an air-supplementing pressurized-water control loop for the phase modulation of a water-turbine generator set is included; the method is mainly implemented through taking the active power consumed when the water-turbine generator set is subjected to phase modulation as a criterion of the blocking / deblocking of an air-supplementing pressurized-water electromagnetic valve for phase modulation, acquiring the analog quantity of an active transducer of the water-turbine generator set by using a PLC (programmable logic controller) of the water-turbine generator set, and realizing the control on the blocking / deblocking of the air-supplementing pressurized-water electromagnetic valve according to preset active power limiting values, wherein the PLC is provided with built-in related logic programs; and the preset active power limiting values are as follows: firstly, an active power limiting value P1 consumed by the water-turbine generator set when the water lever of the runner chamber of the water-turbine generator set is at the upper limit and an active power limiting value P2 consumed by the water-turbine generator set when the water lever of the runner chamber of the water-turbine generator set is at the lower limit are determined; when an active power limiting value P consumed by the water-turbine generator set is greater than P1, the air-supplementing pressurized-water electromagnetic valve is blocked; and when the active power limiting value P consumed by the water-turbine generator set is less than P2, the air-supplementing pressurized-water electromagnetic valve is deblocked.

Description

technical field [0001] The invention relates to a method for controlling water pressure of a hydroelectric generating set in a phase-adjusted operating state, and belongs to the technical field of hydroelectric generating set operation control. technical background [0002] When the hydro-generator set is in phase-adjusted operation, in order to reduce power loss and vibration of the unit, it is necessary to pressurize the water, that is, to use the air compressor to forcibly lower the water level in the water turbine room so that the runner runs in the air. The phase-adjusting and air-supplementing air-water control circuit of the hydro-generator unit is mainly used to control the solenoid valve on the pipeline that sends compressed air to the runner chamber, and replenish air to the runner chamber in time, so that the water level in the runner chamber is always within the required range. . At present, the control loop of phase modulation water level supplement is mainly c...

AI Technical Summary

Problems solved by technology

[0003] (1) Conventional control method is adopted, the connection link is relatively complicated, and there are many fault points

[0004] (2) The environment of the on-site measurement components is humid, which is prone to corrosion of components, blockage of water diversion pipes, and old wiring corrosion.

[0005] problems, such as poor reliability of system operation

[0006] (3) The reliability of the signal device is not high, and the accuracy is low