Control method of adjustable-blade turbine impeller by servomotor

FIELD: power industry.

SUBSTANCE: control method of adjustable-blade turbine impeller by servomotor by shifting the main valve from the middle position includes a determination of the current position of the main servomotor, a determination of the deviation of the current position from the set position, used the pulse three-position controller output signal to form the valve offset value from the central position, wherein the input signal is the deviation rate and the signal proportional to this value. An additional signal is formed proportional to the level increace of the specified deviation rate of the current position of the servomotor from the predetermined one which rate is selected in accordance with the speed determined by the calculation of its positioning accuracy at deviations selected to control its movement by the controller only. The amount of the additional signal and the controller output signal is used as a valve displacement signal.

EFFECT: improved reliability of the impeller blades drive.

12 dwg

 



 

Same patents:

Radial turbine // 2533602

FIELD: machine building.

SUBSTANCE: water having potential energy of total head is delivered from a water reservoir to the unit for feeding of operating medium to branch pipe 10. The water having the maximal speed at this head comes from the nozzle 11 to the annular cavity 5 between the casing 1 and the impeller 3. Water having kinetic energy moves there in circle. Water coming to the annular cavity 5 from the nozzle 11 forces out the excess water having kinetic energy from the annular cavity 5 to the cavity of blades 4, where it transfers its kinetic energy to the impeller 3 providing for the rotation of the latter. Water is drained without resistance from the blades 4 of the impeller through its central part. All blades 4 of the impeller 3 are loaded simultaneously and equally, regardless of the distance to the nozzle.

EFFECT: simplified design, improved reliability and simultaneous simplification of turbine control.

3 cl, 2 dwg

FIELD: power engineering.

SUBSTANCE: driving mechanism for a power-generating device 5 provides for a link between a power generator 20 and a turbine 10, which rotates with varying frequency. The rotating driving mechanism provides for a generator 20 rotation at the outlet with a fixed rotation frequency. The driving mechanism includes a differential gear box (16), which has two output shafts. One drives the generator 20 by means of the shaft 26, and the other one drives an electric machine 30 by means of the transfer 18. The varying reactive torque provided by the electric machine 30, may be used for control of torque and rotation frequency at the outlet shaft 26. The input torque from the turbine 10 is measured in the point of application of gear box 16 reaction, and this measurement is used to change reactive moment provided by the electric machine 30.

EFFECT: inertia in a gear box and inertia of an electric machine are reduced to zero for provision of almost instantaneous change of reactive torque and by means of this for more efficient control of output shaft rotation frequency.

18 cl, 4 dwg

FIELD: electricity.

SUBSTANCE: at the moment of small hydro-electric station start-up all stages of ballast load are started, when rated frequency of generator 2 rotation is achieved, an asynchronous electric motor of a water supply pump 5 is started with a device of reactive power compensation. At the same time the load is redistributed between the ballast load and the started asynchronous electric motor of the water supply pump 5 with the device of individual compensation of reactive power, therefore voltage at the generator 2 stator changes insignificantly. Then upon completion of a transition process, an electric motor of a vacuum pump 6 is started with a device of individual compensation of reactive power. Upon completion of the transition process, similarly electric motors of the first milk pump 7, the second milk pump 8 and a pump of a milk cooler 9 are started, which, due to low capacity in respect to a generator of the small hydro-electric station, slightly reduce voltage at its leads, and therefore electromagnet torque at all electric motors operating under load practically does not change.

EFFECT: higher efficiency of small hydro-electric station application and improved stability of operation of milking system process equipment.

5 dwg

FIELD: power engineering.

SUBSTANCE: some parameters are measured reliably and accurately for inspection, control and/or continuous monitoring of turbines functioning. It is proposed to determine working parameters of a turbine corresponding to its entire working range when functioning with generation of useful output capacity, by measurement of its working parameters in the mode without generation of useful output power.

EFFECT: simplified continuous monitoring of turbine condition, which results in quantitative evaluation of this state.

15 cl, 16 dwg

FIELD: electricity.

SUBSTANCE: operation of micro-HPP, generating power at small water flows, is related to solution of problem of hydraulic unit rotation frequency adjustment. Generation of high-quality power is complicated in most widespread mode of micro-HPP operation for local grid. There are technical solutions, in which control system is provided by tracking electric system for control of power issued to grid, or by action at guide vane of active hydraulic turbine. Disadvantages of such control systems include necessity to transform power supplied to grid, or availability of multiple bulky and unreliable additional control and intermediate elements of effect at hydraulic turbine in control circuit, which affect power parametres of hydraulic unit. In proposed device of power transformation, comprising hydraulic turbine and hydraulic generator, control element is an auxiliary induction motor installed on one shaft with hydraulic turbine and hydraulic generator, and capacity of this motor is low compared to hydraulic generator capacity supplied by control unit.

EFFECT: provides for stabilisation of voltage and frequency of hydraulic unit rotation in case of water head or grid load variations with simultaneous achievement of power transformation device rotation frequency control simplicity, increasing its operational reliability and quality of power issued to grid.

1 dwg

The invention relates to hydromelioration

FIELD: electricity.

SUBSTANCE: operation of micro-HPP, generating power at small water flows, is related to solution of problem of hydraulic unit rotation frequency adjustment. Generation of high-quality power is complicated in most widespread mode of micro-HPP operation for local grid. There are technical solutions, in which control system is provided by tracking electric system for control of power issued to grid, or by action at guide vane of active hydraulic turbine. Disadvantages of such control systems include necessity to transform power supplied to grid, or availability of multiple bulky and unreliable additional control and intermediate elements of effect at hydraulic turbine in control circuit, which affect power parametres of hydraulic unit. In proposed device of power transformation, comprising hydraulic turbine and hydraulic generator, control element is an auxiliary induction motor installed on one shaft with hydraulic turbine and hydraulic generator, and capacity of this motor is low compared to hydraulic generator capacity supplied by control unit.

EFFECT: provides for stabilisation of voltage and frequency of hydraulic unit rotation in case of water head or grid load variations with simultaneous achievement of power transformation device rotation frequency control simplicity, increasing its operational reliability and quality of power issued to grid.

1 dwg

FIELD: power engineering.

SUBSTANCE: some parameters are measured reliably and accurately for inspection, control and/or continuous monitoring of turbines functioning. It is proposed to determine working parameters of a turbine corresponding to its entire working range when functioning with generation of useful output capacity, by measurement of its working parameters in the mode without generation of useful output power.

EFFECT: simplified continuous monitoring of turbine condition, which results in quantitative evaluation of this state.

15 cl, 16 dwg

FIELD: electricity.

SUBSTANCE: at the moment of small hydro-electric station start-up all stages of ballast load are started, when rated frequency of generator 2 rotation is achieved, an asynchronous electric motor of a water supply pump 5 is started with a device of reactive power compensation. At the same time the load is redistributed between the ballast load and the started asynchronous electric motor of the water supply pump 5 with the device of individual compensation of reactive power, therefore voltage at the generator 2 stator changes insignificantly. Then upon completion of a transition process, an electric motor of a vacuum pump 6 is started with a device of individual compensation of reactive power. Upon completion of the transition process, similarly electric motors of the first milk pump 7, the second milk pump 8 and a pump of a milk cooler 9 are started, which, due to low capacity in respect to a generator of the small hydro-electric station, slightly reduce voltage at its leads, and therefore electromagnet torque at all electric motors operating under load practically does not change.

EFFECT: higher efficiency of small hydro-electric station application and improved stability of operation of milking system process equipment.

5 dwg

FIELD: power engineering.

SUBSTANCE: driving mechanism for a power-generating device 5 provides for a link between a power generator 20 and a turbine 10, which rotates with varying frequency. The rotating driving mechanism provides for a generator 20 rotation at the outlet with a fixed rotation frequency. The driving mechanism includes a differential gear box (16), which has two output shafts. One drives the generator 20 by means of the shaft 26, and the other one drives an electric machine 30 by means of the transfer 18. The varying reactive torque provided by the electric machine 30, may be used for control of torque and rotation frequency at the outlet shaft 26. The input torque from the turbine 10 is measured in the point of application of gear box 16 reaction, and this measurement is used to change reactive moment provided by the electric machine 30.

EFFECT: inertia in a gear box and inertia of an electric machine are reduced to zero for provision of almost instantaneous change of reactive torque and by means of this for more efficient control of output shaft rotation frequency.

18 cl, 4 dwg

Radial turbine // 2533602

FIELD: machine building.

SUBSTANCE: water having potential energy of total head is delivered from a water reservoir to the unit for feeding of operating medium to branch pipe 10. The water having the maximal speed at this head comes from the nozzle 11 to the annular cavity 5 between the casing 1 and the impeller 3. Water having kinetic energy moves there in circle. Water coming to the annular cavity 5 from the nozzle 11 forces out the excess water having kinetic energy from the annular cavity 5 to the cavity of blades 4, where it transfers its kinetic energy to the impeller 3 providing for the rotation of the latter. Water is drained without resistance from the blades 4 of the impeller through its central part. All blades 4 of the impeller 3 are loaded simultaneously and equally, regardless of the distance to the nozzle.

EFFECT: simplified design, improved reliability and simultaneous simplification of turbine control.

3 cl, 2 dwg

FIELD: hydropower.

SUBSTANCE: invention relates to hydraulic power engineering and can be used in control systems of hydraulic plants for impeller blades angle correction by correcting the measured pressure signal. Method for correcting an adjustable-blade turbine impeller blades angle formed basing on signals from guiding device opening sensor 1 and a combinatory mechanism of pressure head sensor 2 involves measuring signals from blades angle sensor and generator active power sensor 5.1 and 5.2. As per signals from guiding device opening sensor and blades angle sensor 1 and 5.1 on the basis of the plant characteristic a reference power signal is generated, which is compared with the generator active power signal. If the comparison result is different from zero, the pressure head sensor signal is corrected, which comes to the combinatory mechanism for changing blades angle 2 until the generator active power is equal to the reference power.

EFFECT: invention is aimed at higher accuracy of setting the impeller blades angle, higher turbine efficiency and higher reliability of the control system.

2 cl, 4 dwg

FIELD: power industry.

SUBSTANCE: control method of adjustable-blade turbine impeller by servomotor by shifting the main valve from the middle position includes a determination of the current position of the main servomotor, a determination of the deviation of the current position from the set position, used the pulse three-position controller output signal to form the valve offset value from the central position, wherein the input signal is the deviation rate and the signal proportional to this value. An additional signal is formed proportional to the level increace of the specified deviation rate of the current position of the servomotor from the predetermined one which rate is selected in accordance with the speed determined by the calculation of its positioning accuracy at deviations selected to control its movement by the controller only. The amount of the additional signal and the controller output signal is used as a valve displacement signal.

EFFECT: improved reliability of the impeller blades drive.

12 dwg

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