Pump station electric drive automatic control method

FIELD: electricity.

SUBSTANCE: invention relates to the field of electrical equipment and concerns a method of control of pump station with parallel operating pumps. The method is implemented by that the layout includes the system of automated control of operating modes of high-voltage asynchronous electric motors (HVAM) of pumps providing a possibility of their operation from one frequency converter in the energy effecient mode, additional system of sensors connected to the control system of the microprocessor controller. The additional process branch, an electrotechnical automation branch and standby electrotechnical branch added to the system allow by means of the signals supplied from the controller to the frequency converter to start, stop, operate jointly and alternately HVAM, both from the frequency converter, and independently of it, performing the functions of smooth start-up and regulation of speed of rotation of pump units. The creation of mathematical model in a control system is provisioned. The system disconnects the faulty equipment, evenly distributes operating time of pumps, control of HVAM taking into account the pump characteristics.

EFFECT: invention is aimed at improvement of quality of regulation, speed and reliability of the system, ensuring operation of pump station in cost-saving operating mode, depreciation and increase of service life.

1 dwg

 

The invention relates to the field of electrical and mechanical engineering and relates to methods for management automated pumping stations with pumps operating in parallel and can be used in various industrial fields, in particular in the transport, storage and processing of oil and oil products.

A method of capacity control valve (throttling), based on the increase of the resistance of the pressure line (P. V. Lobachev "Pumps and pumping stations", Proc. for colleges, 3rd ed., Rev. and add., Moscow, stroiizdat, 1990, p. 58).

The method is characterized by a low coefficient of performance (COP), irrational increase of pressure in the pipeline and the risk of cavitation.

Known method of controlling the performance of a centrifugal pump through a bypass through the bypass line from the output of the pump inlet part of the fluid with a regulating valve and a suction valve on the input line from the pump to the bypass line. The control performance is produced by the simultaneous opening and closing the bypass suction valves maintain a constant total flow rate of the fluid in the bypass and output lines or the nominal power consumed by the motor, the torque of the pump (patent RF №2277645, �PC F04D 15/00, publ. 10.06.2006).

The disadvantage of this invention is the loss of energy expended on the message unused pressure propuskaemo the amount of liquid.

The closest adopted for the prototype, is a method of adjustment of the system operation of centrifugal compressors with variable load, which consists in the fact that diagnose energy consumption in the group of parallel-connected centrifugal blowers under unsteady loads with the possibility of regulating the supply to the consumer fluid throttling network of pipelines and step regulation by including simultaneous operation of one or more groups of pumping units, determine the minimum possible energy consumption while ensuring the desired user flow throughout the possible range of its change of minimum pressure and maximum values of efficiency and determine the value of the minimum excess pressure throughout the range of load change in the pressure reservoir when the load-optimized mode. By applying a variable frequency drive and altering the pumping equipment sets the value of the minimum excess pressure in the pressure manifold. The result is optimization of RA�located the whereabouts of a system of centrifugal compressors with variable load (patent RF №2230938, IPC F04D 15/00, publ. 20.06.2004).

The disadvantages of this invention are the high capital and operating costs associated with installation of variable frequency drives and flow meter on each pump, failure to ensure maximum performance simultaneous regulation of the flow and pressure of each of the centrifugal pump when regulating only with the help of variable frequency drives installed on each pump unit.

The aim of the invention is the reduction of energy losses when automatic control of operation modes of pumping plants, reducing the cost and increasing the efficiency of operation of the pump station, increase the efficiency and regulation of operating modes of the pumps in the most energy efficient modes.

This object is achieved in that the method of automatic control of electric pumping station is implemented by a system consisting of a microprocessor controller, frequency Converter installed in the control circuit of high-voltage asynchronous motors (VAD) pumps, switching and processing equipment.

The scheme includes the system of automatic control of operation modes of the WADA management system (and software), which enable their work otonoha frequency Converter for energy-efficient mode, additional sensor (level sensor, mounted in the tank, the pressure sensors at the inlet and at the outlet of the tank, a flow sensor for pipeline valves, sensors currents and angular velocities VAD), the signals which go to the system control microprocessor controller. Additional technological path with adjustable gate valves, non-return valve and the pump, additional electrical branch automation with circuit breaker, magnetic contactor, current sensor and angular velocity, backup electrical branch circuit breaker entered into the system, allow the signal sent from the microprocessor controller of the frequency Converter, to produce a start-up, shutdown, and joint alternate operation of the VAD as from the frequency Converter, and independently from it, performing the functions of soft start and speed control of pump units in trouble-free mode. Provides for the construction of a mathematical model in the control system to maximize the energy efficiency at pumping stations, taking into account the flow, level and pressure pumping station (according to data from the relevant sensors) and combined the characteristics of the pump-tubing, which provides the minimization of the consumed electric power for pumping stations, protection of highly�elitnyh induction motors, redundancy in the event of a fault in the frequency Converter and the constancy of the process.

The control system carries out the function of protection and flexibility with regard to the operation of the pump station, which consists in disconnecting the faulty electrical equipment (such as frequency Converter or high-voltage induction motors) and process equipment (e.g. pumps, valves), uniform distribution of the operating time of the pumps, the control of VAD in accordance with the mechanical characteristics and resistance characteristics of the working pump with minimum power consumption in the system.

Method of automatic control of electric pumping station is illustrated by a drawing, which implements the presented method, the device consisting of a microprocessor 1, which includes in its membership the system energy efficient control of high voltage induction motors 8 and 9 pumps 10 and 11, of the circuit breakers 2, 4, 5, and 25, the frequency Converter 3, the magnetic actuators 6 and 7 to start VAD 8 and 9, the currents sensors 26 and 27 and the angular velocity sensor 28 and 29 in the circuit VAD 8 and 9, the signals which go to the microprocessor controller 1, the reservoir 21, comprising a level sensor 20, the pressure sensor �during 18, pressure sensors at the outlet 23 of the tank 21, pipeline valves, including check valves 14 and 15, the flow sensor 24 and adjustable dampers 12, 13, 16, 17, 19 and 22 driven from a microprocessor 1, an additional process branch (A) with adjustable valves 13, 16, a check valve 15 and the pump 11, an additional electrical branch automation (B) with switch 5, a magnetic starter 7, the current sensor 27 and the angular velocity 29, backup electrical branch () with automatic switch 25.

The invention consists in the following.

Microprocessor controller 1 receives information about the state of the system, querying the readings of the level sensor 20, the pressure sensor at the inlet 18 to the reservoir 21, the pressure sensors at the outlet 23 of the tank 21, the flow sensor 24, sensor currents 26 and 27 and the angular velocity sensor 28 and 29 WADE 8 and 9, driven by a single frequency Converter 3, and outputs a control of the frequency Converter 3 for controlling the modes of operation of the VAD 8 and 9 and adjustable valves 12, 13, 16, 17, 19 and 22 with minimum levels of electricity consumption.

The operating modes of the pumps 10 and 11 is carried out by supplying control signals from a microprocessor controller 1 on magnetic actuators 6 and 7 WADE 8 and 9, introducing their works in�, and regulation of frequency of rotation of the WAD 8 and 9 pumping station is performed by means of a frequency Converter 3, receiving the control signal from the microprocessor controller 1.

Additional technological path (A) of the pump 11, driven work WADE through 9 apply power to additional electrical branch (B) allow the microprocessor controller 1 to control the operating modes of the pumps 10 and 11 based on the comparison of the set parameters by maintaining a constant pressure or flow rate data of the level sensor 20 installed in the tank 21 of the pumping station, control the operating modes of the pumps 10 and 11 at low angular speeds by throttling characteristics of the pipe network using the adjustable control valves 12, 13, 16, 17, 19 and 22, also controlled by the microprocessor controller 1, to regulate the modes of operation of the pumps 10 and 11 within the acceptable range according to the technical characteristics of the frequency Converter 3 and to ensure minimum consumption of electricity WADE 8 and 9 by supplying control signals to the frequency Converter 3, which, in turn, regulates the rotational speed of the VAD 8 and 9. Receiving data from the level sensor 20, the pressure sensor at the inlet 18 to the reservoir 21, the pressure sensors at the outlet 23 of the tank 21, the flow sensor 24, sensor Toko� 26, 27 and the angular velocity sensor 28 and 29 WADE 8 and 9, the microprocessor controller 1 compares them with the set initially by the operator signals.

Backup electrical branch (In) allows you to automatically launch any VAD switching of circuit breakers 25, 2, 4 and 5 with the submission of appropriate control signals by the microprocessor controller 1, including complex software that controls the operating modes of the pumps 10 and 11, which generates a control action depending on the information received from the sensors 18, 20, 23, 24, 26, 27, 28 and 29. The frequency Converter 3 determines the desired value of the rotational speed in accordance with the received signal from the microprocessor controller 1.

The system operates as follows.

In normal mode:

1) Introduced additional technological path (A) and additional elektrotehnicheskaja branch automation (B) allow the microprocessor controller 1 to produce an initial analysis of the terminal number of the pump (10 or 11) and it start. The control system selects the branch corresponding to the pump depending on the parameter values of the sensors. Is a survey of pressure sensors 18 and 23, and if the pressure difference between the inlet and outlet of the tank 21 does not exceed a predetermined limit value, starts to operate the pump 10, �if the pressure difference between the inlet and outlet of the tank 21 exceeds a given limit value, collaborate pumps 10 and 11 with additional technological branches (A). In case of insufficient pressure at the inlet of the selected pump he will not be able to enter the operating mode (analysis of mathematical models in the control system will give low efficiency of the pump by a survey of relevant sensors), so to minimize electricity consumption microprocessor controller 1 will generate a control signal to stop the pump 11.

2) If a specified output pressure of the pump 10 is reached, the microprocessor controller 1 opens an adjustable valve 17 connecting the output of pump 10 with the line of pipe fittings.

The system is a reservoir 21, which receives the oil. Input pipe system provided with inlet adjustable valve 19, the output pipe system is provided with adjustable output valve 22.

Mathematical model in the control system is based on differential equations describing the increase or decrease in the reserve of fluid according to the ratio between the input to the reservoir flow Qpfluid and bled from her stream of Qaboutand the level h of the liquid in it:

The flow of liquid flowing under gravity from the reservoir, will be equal to:

where � - the cross-sectional area of the tank, m2;

µ is the coefficient of discharge;

Qp(t) is the flow rate of the supplied fluid;

h(t) is the liquid level in the tank.

The expression of the dependence of the liquid level from the input stream:

3) Is serial poll pressure sensors 18 and 23, flow 24 and the angular velocity 28 and 29 WADE 8 and 9. Data are compared with predetermined values of control parameters. In case of inconsistency with the command for closing or opening the respective adjustable valves additional technological branches (A) or to stop or start the pump 11 by the starting and stopping of a VAD 9 by supplying and removing power additional electrical branch automation (B).

In case of emergency:

1) If the level in the tank 21 increases dramatically, microprocessor controller 1 further includes VAD 9, feeding on additional electrical branch automation (B), which eliminates inrush currents in electrical circuits, shock moments and overload (water hammer) in piping systems due to the additional introduction into the scheme of the current sensors 26 and 27 WADE 8 and 9.

2) If you refuse the scheme of automation, microprocessor controller 1 automatically connects to Vysokomol�wide induction motor directly to the network, implementing direct start using the backup electrical branch (B) using the automatic switch 25, and the alternate mode of operation is performed by enabling and disabling VAD 8 and 9.

3) If power is lost in the power grid, the reliability of the system of complex automation of any of the included WAD pickup is provided by the angular velocity currently running WADE (8 or 9) using the angular velocity sensors 28 and 29 mounted on WADE 8 and 9.

4) If there is a gust of the pipeline, the pressure decrease in the system. The exit from the emergency situation will pump stop the damaged pipe and the inclusion of the second pump. To stop you need to close the damaged technological path. Microprocessor controller 1, receiving the value of the signal from the pressure sensors at the outlet 23 of the tank 21, the corresponding under-pressure in the system, processes it, and software-based algorithms generates a control signal for closing the controlled valve 12, 17 or 13, 16. After that, microprocessor controller 1 is issued, the control signal to the frequency Converter 3 to stop the pump and WAD damaged technological branches, namely a contact of the circuit breaker 4 and the magnetic actuator 6 or the circuit breaker 5 and the magnetic starter 7 �tclocal running the pump from power. The logic of starting a similar logic shutdown.

The invention is aimed at improving the quality of regulation, to improve the performance and reliability of the system, to ensure the operation of the pumping station in the economical mode, reducing the cost and increasing the life of the equipment.

The technical result of the invention is to improve the quality of regulation and the performance of the system, due to the continuous control of microprocessor controller; regulating the angular velocity of the impeller of the pump via frequency Converter allows to obtain energy savings through variable regulation of the impeller; to reduce water loss by eliminating excess pressure in the hydraulic network. Control using microprocessor-based controller allows you to completely eliminate the human factor, i.e. to avoid the mistakes of the person.

Thus, the method allows to extend the functionality of the automatic system, increase the degree of protection of the equipment and reliability of the pumping station and implement overall control of pumps in energy-efficient mode.

The invention is feasible in an industrial environment on an existing element basis.

Method of automatic control of electric drive pump with�Anzhi, including the frequency Converter is installed in the control circuit of high-voltage asynchronous motors (VAD) pumps, switching and technological equipment, namely that the analysis of energy consumption in the group of parallel-connected pumps in conditions of unsteady loads with the possibility of controlling the flow of fluid by throttling the network of pipelines and step regulation by including simultaneous operation of one or more groups of pumping units, minimizing potential costs of electricity under the condition of providing the required flow throughout the possible range of change of minimum pressure and maximum values of the efficiency optimization mode, and by the use of variable frequency drives and altering the pumping equipment sets the value of the minimum excess pressure in the pressure reservoir, the result is optimization of the pumping station at variable load, wherein the circuit further introduced microprocessor controller, the frequency Converter comprising a soft start device, which allows you to launch and manage two modes WADE, an additional sensor system: sensor ur�VNA, mounted in the tank, the pressure sensors at the inlet and at the outlet of the tank, a flow sensor for pipeline valves, sensors currents and angular velocities WADE, the software and the system of automatic control of switching and technological equipment from the microprocessor controller, which enable their work from one frequency Converter for energy-efficient mode, and the diagram includes additional technological branch, additional electrical branch automation and backup electrical branch, enables the signal sent from the microprocessor controller of the frequency Converter, to produce a start-up, shutdown, and joint alternate operation of the VAD as from the frequency Converter, and independently from it, performing the functions of soft start and speed control of pump units of accident-free operation, moreover, provides for the construction of a mathematical model in the control system to maximize the energy efficiency at pumping stations, taking into account the flow, level and pressure at the pumping station according to the respective sensors and combined characteristics of the pump-tubing, which provides the minimization of the consumed electric power for pumping stations, protection of high-voltage asynchronous e�of extradigital, redundancy in the event of a fault in the frequency Converter and the consistency of the technological process with the possibility of implementation of system of management of security features and flexible configuration of operation of the pump station, which consists in disconnecting the faulty electrical and technological equipment, uniform distribution of the operating time of the pumps, the control of VAD in accordance with the mechanical characteristics and resistance characteristics of the working pump with minimum power consumption in the system.



 

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3 cl, 4 dwg

FIELD: engines and pumps.

SUBSTANCE: screw hydraulic pump includes housing 1, front and rear covers 3, 14, shaft 5, inlet branch pipe 17 and outlet branch pipe. On inner end surface of front cover 3 there radially provided are cylinders 6 located at equal distance from each other and are continued part of the above cover; the above cylinders are covered on the side of shaft 5 rotation axis and have one central hole in closed side. Inner cavity of each of cylinders 6 is hydraulically connected to inlet and outlet cavities 16, 12. Screw in the form of shaft with spiral comb is inserted inside each cylinder 6. One end of shaft is passed into the hole of covered side of cylinder 6 and driven gear 9 is fixed on it and is engaged with driving gear 10 of shaft 5 of hydraulic pump. The other end of screw is inserted in bearing of cover of cylinder 6, which has liquid passage holes to outlet cavity 12. Inlet cavity 16 is connected to inner cavity of cylinder 6 by means of opening 15 located on housing of cylinder 6 closer to rotation axis of shaft 5 of hydraulic pump.

EFFECT: improving technical characteristics of hydraulic pump.

6 dwg

FIELD: manufacture of aircraft engines; centrifugal gear pumps used in oil systems of aircraft gas-turbine engines.

SUBSTANCE: proposed two-section centrifugal pump has housing with two covers and two pairs of swinging gears with impellers fitted on two common shafts. Housing consists of two halves forming closed cavity inside which covers are mounted in mirror image relative to each other and turned through 180 deg. Covers and halves of housing form two closed cavities where gears are located. Provision is made for enhancing tightness of pump at simplified adjustment of backlash in gears due to separation of adjusting functions and functions ensuring tightness in pump.

EFFECT: enhanced efficiency and reliability.

4 cl, 2 dwg

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