CN112799437B - Self-adaptive control method of liquid level maintaining system - Google Patents
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Abstract
A self-adaptive control method for the liquid level maintaining system features that said liquid level maintaining system contains multiple constant-frequency liquid discharge pumps with different models and specifications as liquid level maintaining equipment. The device also comprises a drainage pool, a reservoir, a pipeline, a liquid level maintaining device, a sensor, a controller, a human-computer interaction device, a secondary loop and a communication loop. The invention aims to solve the problems that the output power of a steady-state fixed incoming water load is not matched with the output power of a liquid level maintaining device, namely the liquid level of a system is not matched with the liquid discharging capacity of the liquid level maintaining device due to the rising speed of steady-state fixed incoming water, and the output power of a random incoming water load with a longer change period is not matched with the output power of the liquid level maintaining device, namely the liquid level of the system is not matched with the liquid discharging capacity of the liquid level maintaining device due to the rising speed of random incoming water with a longer change period, the liquid level maintaining device is frequently started, stopped, loaded and unloaded, the abrasion of original parts of the device is aggravated, the service life of the liquid level maintaining device is influenced, the energy loss is caused, the energy efficiency and the economy of the system are influenced, and the like.
Description
Technical Field
The invention belongs to the technical field of industrial control, and particularly relates to a self-adaptive control method of a liquid level maintaining system.
Background
In industrial control, a liquid level maintaining system is needed in many application occasions, for example, a water turbine leaks water at the top cover part of a water turbine chamber of a water turbine generator set, and a water discharging system of the top cover of the water turbine is needed; a riverbed rock mass water leakage is arranged in the dam body of the hydropower station, and a dam foundation drainage system is needed; the maintenance of the hydropower station unit needs the maintenance of a drainage system of the unit; the factory building needs a factory rainwater drainage system due to rain and waterlogging in the flood season, and the systems are typical liquid level maintaining systems.
The liquid level maintaining system is usually designed with a plurality of fixed-frequency liquid discharge pumps with the same model and specification as liquid level maintaining equipment, but because the liquid level maintaining system load has a steady-state fixed incoming water load and a random incoming water load, if the steady-state fixed incoming water load is not matched with the output power of the liquid level maintaining equipment, namely the liquid level of the system is not matched with the liquid discharge capacity of the liquid level maintaining equipment due to the rising speed of the steady-state fixed incoming water, or the random incoming water load with a longer change period is not matched with the output power of the liquid level maintaining equipment, namely the liquid level of the system is not matched with the liquid discharge capacity of the liquid level maintaining equipment due to the rising speed of the random incoming water with a longer change period, the liquid level maintaining equipment is frequently started, stopped or unloaded, the abrasion consumption of equipment elements is intensified, the service life of the liquid level maintaining equipment is influenced, and energy loss is caused at the same time, and the energy efficiency and the economy of the system are influenced.
Disclosure of Invention
In order to solve the technical problem, the invention provides a self-adaptive control method of a liquid level maintaining system, which aims to solve the problem that the output power of a steady-state fixed incoming water load is not matched with the output power of a liquid level maintaining device, namely: the rising speed of the incoming water due to the steady-state fixation of the liquid level of the system is not matched with the liquid discharge capacity of the liquid level maintaining equipment; and the random incoming water load with longer variation period is not matched with the output power of the liquid level maintaining equipment, namely the liquid level of the system is caused by the fact that the rising speed of the random incoming water with longer variation period is not matched with the liquid level maintaining equipment liquid discharging capacity: the liquid level maintenance equipment is frequently started and stopped or is loaded and unloaded, the abrasion consumption of equipment components is aggravated, the service life of the liquid level maintenance equipment is influenced, energy loss is caused, and the energy efficiency and the economical efficiency of the system are influenced.
The technical scheme adopted by the invention is as follows:
an adaptive control method of a liquid level maintaining system comprises the following steps:
And 3, collecting the liquid level maintaining system liquid level H1 by the controller, and starting timing.
And 4, detecting whether the timing is finished for t minutes by the controller, if so, entering the step 5, and otherwise, continuously detecting.
And 5, collecting a liquid level maintaining system liquid level H2 by the controller.
And 6, calculating the steady-state fixed incoming water load q of the liquid level maintaining system by the controller, wherein the q is (H1-H2) S/t.
And 7, if qi is not more than q and is less than qj, starting an i # fixed-frequency liquid discharge pump as main liquid discharge equipment to operate for a long time, and entering the step 10. And qi and qj are the liquid discharge capacities of n constant-frequency liquid discharge pumps in the liquid level maintaining equipment are sorted from small to large, and the liquid discharge capacities of two adjacent corresponding equipment i # and j # are information. Otherwise, go to step 8.
And 8, if q is less than q1, starting the 1# fixed-frequency drain pump as the main drainage equipment to operate for a long time, and entering the step 10. Otherwise, go to step 9.
And 9, starting the n # fixed-frequency liquid discharge pump as main liquid discharge equipment to operate for a long time, and entering step 10.
And step 10, the controller collects the liquid level maintaining system liquid level H3 and starts timing at the same time.
And 11, detecting whether the timing is finished for t minutes by the controller, if so, entering the step 5, and otherwise, continuously detecting.
And step 12, collecting a liquid level maintaining system liquid level H4 by the controller.
And step 13, the controller calculates the random water incoming load q' of the liquid level maintenance system as (H3-H4) S/t.
Step 14, generating a liquid discharge capacity set according to the liquid discharge capacities of n-1 fixed-frequency liquid discharge pumps in the liquid level maintaining equipment after the main liquid discharge equipment is removed, wherein the set comprises a single liquid discharge capacity and any 2 combined liquid discharge capacities, namely the combined liquid discharge capacities of the 2 fixed-frequency liquid discharge pumps which are added together; … … any n-2 combined liquid discharge capacities and any n-1 combined liquid discharge capacities, the set comprising
The liquid discharge capacity elements sort all the elements of the set from small to large, the sort order numbers are 1,2, … …,
the liquid discharge capacity elements are respectively
The liquid discharge capacity element is associated with the fixed-frequency liquid discharge pump of the corresponding combined liquid discharge.
Step 15, if q'i≤q’<q’jAnd then starting a liquid discharge capacity element q'jThe associated fixed frequency drain pump operates as a backup drain, proceeding to step 18. q's'iAnd q'jThe elements in the liquid discharge capacity set are arranged from small to large, and then the adjacent liquid discharge capacity elements are arranged. Otherwise, step 16 is entered.
Step 16, if q'<q’1And then starting a liquid discharge capacity element q'1The associated fixed frequency drain pump operates as a backup drain, proceeding to step 18.Otherwise, step 17 is entered.
And step 17, starting all the constant-frequency drainage pumps to operate as standby drainage equipment, and entering step 18.
Step 18, if the liquid level H of the liquid level maintaining system is larger than the liquid level H of the system starting and standby pumpPrepare forAnd starting all standby constant-frequency drain pumps. Step 19 is entered.
Step 19, if the liquid level maintains that the system liquid level H is not more than the rated system liquid level HForehead (forehead)And stopping all standby constant-frequency drain pumps. Step 20 is entered.
Step 20, when the liquid level of the liquid level maintaining system is higher than the liquid level H of the starting pumpPrepare forAnd rated liquid level HForehead (forehead)If not, returning to step 10, otherwise returning to step 18.
The invention discloses a self-adaptive control method of a liquid level maintaining system, which has the following technical effects:
1. the liquid level maintaining system is designed with the fixed-frequency liquid discharge pumps with different liquid discharge capacities as liquid level maintaining equipment so as to be suitable for the conditions that steady-state fixed incoming water loads and random incoming water loads are in different size ranges, and therefore the liquid level maintaining system has wide adaptability.
2. By adopting the self-adaptive control method of the liquid level maintaining system, under the premise of adopting the fixed-frequency liquid discharge pump, an optimization algorithm is adopted, the fixed-frequency liquid discharge pump close to the load is selected as the main liquid discharge equipment as far as possible to operate for a long time according to the calculated stable state and the fixed incoming water load, so that the stability of the liquid level of a control object is improved, the change speed of the liquid level is reduced as far as possible, the stability of the liquid level is ensured, the frequent starting, stopping, loading and unloading of the liquid level maintaining equipment are avoided, the abrasion consumption of original components of the equipment is reduced, the service life of the liquid level maintaining equipment is prolonged, the energy consumption of the liquid level maintaining system is reduced, and the economical efficiency of the liquid level maintaining system is improved. Therefore, the method has good control performance and economy.
3. By adopting the self-adaptive control method of the liquid level maintaining system, under the premise of adopting the fixed-frequency liquid discharge pump, an optimization algorithm is adopted, and the combined liquid discharge fixed-frequency liquid discharge pump corresponding to the liquid discharge capacity element close to the load is selected to operate as much as possible according to the calculated random water load, so that the stability of the liquid level of a control object is improved, the liquid level change speed is reduced as much as possible, the stability of the liquid level is ensured, the frequent starting, stopping or loading and unloading of the liquid level maintaining equipment are avoided, the abrasion consumption of original components of the equipment is reduced, the service life of the liquid level maintaining equipment is prolonged, the energy consumption of the liquid level maintaining system is reduced, and the economical efficiency of the liquid level maintaining system is improved. Therefore, the method has good control performance and economy.
4. By adopting the self-adaptive control method of the liquid level maintaining system, the matching of steady-state fixed incoming water loads and the matching of random incoming water loads are considered, and the control method is more complete and comprehensive and has better effect.
5. The self-adaptive control method of the liquid level maintaining system can solve the problems that the steady-state fixed incoming water load of the liquid level maintaining system is not matched with the output power of the liquid level maintaining equipment, namely the liquid level of the system is not matched with the liquid discharging capacity of the liquid level maintaining equipment due to the fact that the rising speed of the steady-state fixed incoming water is not matched with the liquid discharging capacity of the liquid level maintaining equipment, the liquid level maintaining equipment is frequently started, stopped or unloaded, the abrasion consumption of original equipment is intensified, the service life of the liquid level maintaining equipment is influenced, energy loss is caused, the energy efficiency and the economical efficiency of the system are influenced, and the like.
6. The self-adaptive control method of the liquid level maintaining system can solve the problems that the random incoming water load with a long change period of the liquid level maintaining system is not matched with the output power of the liquid level maintaining equipment, namely the liquid level of the system is not matched with the liquid discharging capacity of the liquid level maintaining equipment due to the fact that the rising speed of the random incoming water with the long change period is not matched, the liquid level maintaining equipment is started, stopped or unloaded frequently, the abrasion consumption of original equipment is aggravated, the service life of the liquid level maintaining equipment is influenced, energy loss is caused, the energy efficiency and the economical efficiency of the system are influenced, and the like.
Drawings
FIG. 1 is a schematic diagram of a liquid level maintaining system according to the present invention.
FIG. 2 is a flow chart of an intelligent control method for a liquid level maintaining system according to the present invention.
Detailed Description
As shown in fig. 1, a self-adaptive control method for a liquid level maintaining system relates to a liquid level maintaining system, which comprises a plurality of fixed-frequency liquid discharge pumps with different models and specifications as liquid level maintaining equipment 4. The device further comprises a drainage pool 1, a reservoir 2, a pipeline 3, a liquid level maintaining device 4, a sensor 5, a controller 6, a man-machine interaction device 7, a secondary electric loop 8 and a communication loop 9.
The drainage basin 1 is a place where incoming water is stored, and waits for the liquid level maintaining device 4 to pump it to the reservoir 2.
The reservoir 2 is a place where the drained water is stored.
The pipeline 3 is connected with the drainage pool 1, the reservoir 2 and the liquid level maintaining equipment 4.
The liquid level maintaining equipment 4 is n fixed-frequency liquid discharge pumps with incompletely same model specifications, and the liquid discharge pumps are respectively 1# and 2# … … n # according to the sequence from small to large of liquid discharge capacity.
The sensor 5 collects physical quantity parameters, such as liquid levels and the like, of the drainage pool 1 and the water storage pool 2 in the liquid level maintenance system.
The controller 6 receives the liquid discharge capacity information q1, q2, …, qn corresponding to n fixed-frequency liquid discharge pumps in the liquid level maintaining equipment 4 arranged by the man-machine interaction device 7 through the communication circuit 9, (q1< q2< … < qn), and controls the n fixed-frequency liquid discharge pumps with incompletely same model specifications in the liquid level maintaining equipment 4 through the secondary electric circuit 8 after logic processing is carried out by adopting a liquid level maintaining system self-adaptive control method according to the liquid level maintaining system state signal collected by the sensor 5 received through the secondary electric circuit 8, and simultaneously transmits the liquid level maintaining system state information to the man-machine interaction device 7 through the communication circuit 9.
The human-computer interaction device 7 communicates with the controller 6. The liquid discharge capacity information of n fixed-frequency liquid discharge pumps in the liquid level maintaining equipment 4 arranged by a user through the human-computer interaction device 7 is transmitted to the controller 6, and meanwhile, the human-computer interaction device 7 collects the liquid level maintaining system parameter information sent by the controller 6 for graphical display.
The liquid level maintaining equipment 4 is connected with the controller 6 through a secondary electric loop 8, and the sensor 5 is connected with the controller 6, so that the transmission of state signals and control signals is realized.
The controller 6 is connected with the man-machine interaction device 7 through the communication loop 9, and the transmission of liquid discharge capacity information and state information is realized.
The liquid level maintaining equipment 4 adopts a three-phase asynchronous motor long-shaft deep well pump with the brand of FULE/fullerene and the model of YLB250 series.
The sensor 5 adopts a pressure sealing type liquid level signal device with the brand of Wensts and the model number of LY25-CS41F2AN2H (0-40 m).
The controller 6 adopts PLC with the brand of Rockwell and the model number of 1769-L311769-L35E CompactLogix.
The man-machine interaction device 7 adopts a touch screen with a Rockwell brand and a model number of 2711pc-T10C4D1
And the secondary loop 8 adopts a universal national standard cable.
The communication loop 9 adopts a universal 9-pin serial port communication line.
As shown in fig. 2, an adaptive control method for a liquid level maintaining system includes the following steps:
And 3, collecting the liquid level maintaining system liquid level H1 by the controller 6, and starting timing.
And 4, detecting whether the timing is finished for t minutes by the controller 6, if so, entering the step 5, and otherwise, continuously detecting.
And 5, collecting the liquid level maintaining system liquid level H2 by the controller 6.
And 6, calculating the steady-state fixed incoming water load q of the liquid level maintaining system by the controller 6, wherein the incoming water load q is (H1-H2) S/t.
And 7, if qi is not more than q and is less than qj, starting an i # fixed-frequency liquid discharge pump as main liquid discharge equipment to operate for a long time, and entering the step 10. qi and qj are the drainage capacities of n constant frequency drainage pumps in the liquid level maintaining equipment 4, which are sorted from small to large, and the drainage capacities of two adjacent corresponding equipment i # and j # are information. Otherwise, go to step 8.
And 8, if q is less than q1, starting the 1# fixed-frequency drain pump as the main drainage equipment to operate for a long time, and entering the step 10. Otherwise, go to step 9.
And 9, starting the n # fixed-frequency liquid discharge pump as main liquid discharge equipment to operate for a long time, and entering step 10.
And step 10, the controller 6 collects the liquid level maintaining system liquid level H3 and starts timing at the same time.
And 11, detecting whether the timing is finished for t minutes by the controller 6, if so, entering the step 5, and otherwise, continuously detecting.
And step 12, the controller 6 collects a liquid level maintaining system liquid level H4.
And step 13, the controller 6 calculates the random water supply load q' of the liquid level maintenance system as (H3-H4) S/t.
Step 14, generating a liquid discharge capacity set according to the liquid discharge capacities of n-1 fixed-frequency liquid discharge pumps after the main liquid discharge equipment in the liquid level maintaining equipment 4 is removed, wherein the set comprises a single liquid discharge capacity and any 2 combined liquid discharge capacities, namely the combined liquid discharge capacities of the 2 fixed-frequency liquid discharge pumps which are added together; … … any n-2 combined liquid discharge capacities and any n-1 combined liquid discharge capacities, the set comprising
The liquid discharge capacity elements sort all the elements of the set from small to large, the sort order numbers are 1,2, … …,
the liquid discharge capacity elements are respectively
The liquid discharge capacity element is associated with the fixed-frequency liquid discharge pump of the corresponding combined liquid discharge.
Step 15, if q'i≤q’<q’jAnd then starting a liquid discharge capacity element q'jThe associated fixed frequency drain pump operates as a backup drain, proceeding to step 18. q's'iAnd q'jThe elements in the liquid discharge capacity set are arranged from small to large, and then the adjacent liquid discharge capacity elements are arranged. Otherwise, step 16 is entered.
Step 16, if q'<q’1And then starting a liquid discharge capacity element q'1The associated fixed frequency drain pump operates as a backup drain, proceeding to step 18. Otherwise, step 17 is entered.
And step 17, starting all the constant-frequency drainage pumps to operate as standby drainage equipment, and entering step 18.
Step 18, if the liquid level H of the liquid level maintaining system is larger than the liquid level H of the system starting and standby pumpPrepare forAnd starting all standby constant-frequency drain pumps. Step 19 is entered.
Step 19, if the liquid level maintains that the system liquid level H is not more than the rated system liquid level HForehead (forehead)And stopping all standby constant-frequency drain pumps. Step 20 is entered.
Step 20, when the liquid level of the liquid level maintaining system is higher than the liquid level H of the starting pumpPrepare forAnd rated liquid level HForehead (forehead)If not, returning to step 10, otherwise returning to step 18.
Example (b):
the method is applied to the start-stop control of the drainage pump of the dam foundation drainage system of a certain power station. 4 drainage pumps are designed in the system, wherein 1 pump is started to serve as a main working pump, and the other 3 pumps serve as standby pumps during normal work. The method of the present invention will be described in detail below with reference to the examples.
The method for controlling the drainage pump of the dam foundation drainage system of a certain power station comprises the following detailed steps:
1. the dam foundation drainage system controller is initialized, the cross section area S of the drainage pool 1 set by a user through a man-machine interaction device is collected, and the pump starting and standby liquid level H is obtainedPrepare forRated level HForehead (forehead)4 drainage capacities corresponding to the drainage pumpsThe information is 0.1Mqa/min, 0.2Mqa/min, 0.3Mqa/min and 0.4 Mqa/min.
2. The dam foundation drainage system controller controls 4 fixed-frequency drainage pumps to operate and drains the dam foundation drainage system to a rated water level HForehead (forehead)Then, 4 drain pump operations are stopped.
3. And detecting and collecting the dam foundation drainage system liquid level H1 by the dam foundation drainage system controller, and starting timing at the same time.
4. And (4) detecting whether the timing is finished for t minutes by the dam foundation drainage system controller, if so, entering the step 5, and otherwise, continuously monitoring.
5. And detecting and collecting the dam foundation drainage system liquid level H2 by the dam foundation drainage system controller.
6. And the dam foundation drainage system controller calculates the steady-state fixed incoming water load q of the dam foundation drainage system as (H1-H2) S/t.
7. If q is more than or equal to 0.1 and less than 0.2, starting a No. 1 fixed-frequency drainage pump as main drainage equipment to run for a long time, and entering the step 10; if q is more than or equal to 0.2 and less than 0.3, starting a No. 2 fixed-frequency drainage pump as main drainage equipment to run for a long time, and entering the step 10; if q is more than or equal to 0.3 and less than 0.4, starting a No. 3 fixed-frequency drainage pump as main drainage equipment to run for a long time, and entering the step 10; otherwise, step 8 is entered.
8. And if q is less than 0.1, starting the 1# fixed-frequency drainage pump as main drainage equipment to run for a long time, and entering the step 10. Otherwise, step 9 is entered.
9. And starting the 3# fixed-frequency draining pump as the main draining device to operate for a long time, and entering the step 10.
10. The dam foundation drainage system controller collects the liquid level maintenance system liquid level H3 and starts timing at the same time.
11. And (4) detecting whether the timing is finished for t minutes by the dam foundation drainage system controller, if so, entering the step 5, and otherwise, continuously detecting.
12. The dam foundation drainage system controller collects a liquid level maintenance system liquid level H4.
13. And the dam foundation drainage system controller calculates the random water load q' of the liquid level maintenance system as (H3-H4) S/t.
14. A drainage capacity set is generated according to the drainage capacity of 3 fixed-frequency drainage pumps after the main drainage equipment in the liquid level maintaining equipment 4 is removed,the set includes a single drain capacity, any 2 combined drain capacities (i.e., combined drain capacities of any 2 constant frequency drain pumps added together) and any 3 combined drain capacities, and the set includes
The drainage capability elements are sorted from small to large, the sorting sequence numbers are 1,2, … …, 6 and 7 in sequence, and the drainage capability elements are q 'respectively'm(m is more than or equal to 1 and less than or equal to 7), and the drainage capacity element is associated with the fixed-frequency drainage pump for combined drainage.
15. Q's'i≤q’<q’jThen start the drainage capability element q'jThe associated fixed frequency drain pump operates as a back-up drain and proceeds to step 18. q's'iAnd q'jThe elements in the drainage capacity set are sorted from small to large, and then the adjacent drainage capacity elements are arranged. Otherwise, step 16 is entered.
16. Q's'<q’1Then start the drainage capability element q'1The associated fixed frequency drain pump operates as a back-up drain and proceeds to step 18. Otherwise, go to step 17.
17. And starting all the fixed-frequency drainage pumps to operate as standby drainage equipment, and entering the step 18.
18. If the water level of the water level maintaining system is larger than the water level H of the system starting and standby pumpPrepare forAnd starting all standby constant-frequency draining pumps. And entering the step 19.
19. If the water level of the water level maintaining system is not more than the rated water level H of the systemForehead (forehead)And unloading and stopping all the standby constant-frequency drainage pumps. Step 20 is entered.
20. When the water level of the water level maintaining system is higher than the water level H of the starting pumpPrepare forAnd rated water level HForehead (forehead)If not, returning to step 10, otherwise returning to step 18.
Claims (1)
1. An adaptive control method for a liquid level maintaining system, comprising the steps of:
step 1, initializing a controller (6), collecting the cross-sectional area S of a drainage pool (1) set by a user through a man-machine interaction device (7), and starting and preparing a pump liquid level HPrepare forRated level HForehead (forehead)The liquid discharge capacity information q1, q2, …, qn, q1 and q2 and … and qn corresponding to n fixed-frequency liquid discharge pumps in the liquid level maintenance equipment (4);
step 2, the controller (6) controls the n fixed-frequency liquid discharge pumps to operate, and the liquid level maintaining system discharges liquid to a rated liquid level HForehead (forehead)Then stopping the operation of the n constant-frequency liquid discharge pumps;
step 3, collecting a liquid level maintaining system liquid level H1 by the controller (6), and starting timing;
step 4, the controller (6) detects whether the timing is over t minutes, if yes, the step 5 is carried out, and if not, the detection is continued;
step 5, collecting a liquid level maintaining system liquid level H2 by the controller (6);
step 6, the controller (6) calculates the steady-state fixed incoming water load q of the liquid level maintaining system as (H1-H2) S/t;
step 7, if qi is not more than q < qj, starting an i # fixed-frequency liquid discharge pump as main liquid discharge equipment to operate for a long time, and entering step 10; qi and qj are the liquid discharge capacities of n fixed-frequency liquid discharge pumps in the liquid level maintaining equipment (4) are sorted from small to large, and the liquid discharge capacities of two adjacent corresponding equipment i # and j # are information; otherwise, entering step 8;
step 8, if q is less than q1, starting a 1# fixed-frequency liquid discharge pump as main liquid discharge equipment to run for a long time, and entering step 10; otherwise, go to step 9;
step 9, starting the n # fixed-frequency liquid discharge pump as main liquid discharge equipment to operate for a long time, and entering step 10;
step 10, collecting a liquid level maintaining system liquid level H3 by the controller (6), and starting timing;
step 11, the controller (6) detects whether the timing is over t minutes, if yes, the step 5 is carried out, and otherwise, the detection is continued;
step 12, collecting a liquid level maintaining system liquid level H4 by a controller (6);
step 13, the controller (6) calculates the random water supply load q' ═ H3-H4) S/t of the liquid level maintenance system;
step 14, generating a drainage capacity set according to the drainage capacities of n-1 fixed-frequency drainage pumps after the main drainage equipment in the liquid level maintaining equipment (4) is removed, wherein the set comprises a single drainage capacity, any 2 combined drainage capacities, … …, any n-2 combined drainage capacities and any n-1 combined drainage capacities, wherein any 2 combined drainage capacities are combined drainage capacities formed by adding any 2 fixed-frequency drainage pumps together, and the set comprises the combined drainage capacities formed by adding any 2 fixed-frequency drainage pumps together
The liquid discharge capacity elements sort all the elements of the set from small to large, and the sequence numbers are sequentially
The liquid-discharge ability elements are q'm；
The liquid discharge capacity element is associated with the corresponding fixed-frequency liquid discharge pump for combined liquid discharge;
step 15, if q'i≤q’<q’jAnd then starting a liquid discharge capacity element q'jThe associated constant frequency positive displacement pump operates as a backup displacement device and proceeds to step 18; q's'iAnd q'jThe elements in the liquid discharge capacity set are arranged from small to large, and then the adjacent liquid discharge capacity elements are arranged; otherwise, go to step 16;
step 16, if q'<q’1And then starting a liquid discharge capacity element q'1The associated constant frequency positive displacement pump operates as a backup displacement device and proceeds to step 18; otherwise, go to step 17;
step 17, starting all the fixed-frequency drainage pumps to operate as standby drainage equipment, and entering step 18;
step 18, if the liquid level H of the liquid level maintaining system is larger than the liquid level H of the system starting and standby pumpPrepare forOpenerMoving all standby constant-frequency liquid discharge pumps; entering step 19;
step 19, if the liquid level maintains that the system liquid level H is not more than the rated system liquid level HForehead (forehead)Stopping all standby constant-frequency liquid discharge pumps; entering step 20;
step 20, when the liquid level of the liquid level maintaining system is higher than the liquid level H of the starting pumpPrepare forAnd rated liquid level HForehead (forehead)If not, returning to step 10, otherwise returning to step 18.
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| US6029298A (en) * | 1998-04-14 | 2000-02-29 | General Electric Company | System and method for determining a liquid level setting in a washing machine |
| US20060169055A1 (en) * | 2005-01-06 | 2006-08-03 | Sensotech | Method and system for measuring fluid level in a container |
| EP1850098B1 (en) * | 2006-04-27 | 2013-01-30 | Hugh Corum Sintes | Ultrasonic liquid level sensor |
| US9254896B2 (en) * | 2013-08-20 | 2016-02-09 | Medallion Instrumentation Systems, Llc | Ballast system and related methods |
| CN104020673B (en) * | 2014-06-12 | 2017-02-15 | 广东石油化工学院 | Self-adaptive control algorithm for level instrument |
| CN206835952U (en) * | 2017-05-12 | 2018-01-05 | 广州仟湖水族宠物器材制造有限公司 | The New aquarium controlled using the water level adaptive equalization of ball float triggering |
| CN208153308U (en) * | 2018-01-19 | 2018-11-27 | 上海联达节能科技股份有限公司 | A kind of deep well pump group's energy-saving control system based on adaptive Expert Controller |
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