A control method for high-efficiency frequency conversion and constant pressure water supply system based on inverse method
A water supply system, frequency conversion and constant pressure technology, applied in water supply devices, adaptive control, general control systems, etc., can solve problems such as the inability to guarantee high-efficiency operation of the scheme, increased cost, and reduced service life and performance of motors and frequency converters
Active Publication Date: 2015-12-09
台州沃夫森泵业有限公司
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Problems solved by technology
Since the output mechanical power of the water pump is P out (t)=p(t)×q(t) (where: at time t, P out (t) is the output mechanical power, p(t) is the water pressure, and q(t) is the flow rate), so flow sensors must be added, which will lead to complex system structure and increased cost
②When the main pump and the auxiliary pump are operated in parallel, the high efficiency operation of the scheme cannot be guaranteed
And the main pump may work at low frequency, resulting in serious heat loss and low-frequency vibration of the main pump; ③In the case of small flow, the main pump is in low-frequency operation, resulting in low motor efficiency and serious low-frequency noise, reducing the use of motors and frequency converters Life and performance, adversely affect the safety and reliability of water supply and production costs
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[0040] 1. Mathematical model of pump shaft output power:
[0041] The schematic diagram of the water supply system is as follows figure 1 As shown, it mainly includes water intake source 1, check valve 2, small power pump motor M 1 , Medium power water pump motor M 2 , High-power water pump motor M 3 , and its corresponding rated power and (in: ), motor M 1 Control switch S 1 , Motor M 2 Control switch S 2 , Motor M 3 Control switch S 3、 Air pressure tank 3, pressure gauge 4, water outlet control valve 5, inverter circuit 6, controller 7, temperature sensor 8, input power supply 9, etc. figure 1 The bold line in the middle indicates the power line, and the direction of the arrow indicates the direction of power transmission. The water source 1 is mainly the tap water pipe network or deep wells, ponds, rivers and lakes, etc.; the main function of the check valve 2 is to prevent the water in the user network pipe from flowing back to the water source when the wa...
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The invention provides a control method of a high-efficiency variable frequency constant pressure water supply system based on an inverse solution method. The control method comprises the steps that mathematical models and constraint conditions among output power values, frequency disturbance quantities and water pressure variable quantities are established and a mathematical model needed by online detection of the output power of the water supply system is formed; frequency small signal perturbation is conducted under stable working conditions, pressure values of a pipe net are sampled, the shaft output power in a steady state is worked out in an iterating mode according to the mathematical models of the output power values, and water pump motors with different power values are automatically selected to work according to the value of the shaft output power. By means of the control method, high-efficiency operation of the system can be guaranteed, and therefore the working efficiency of the variable frequency constant pressure water supply system can be improved obviously. Besides, the fault of low frequency caused by low-frequency operation of the motor and a frequency converter can be effectively avoided, the service life of the system is prolonged, the reliability of the system is improved, and safe and efficient running of the motor of a water pump is reliably guaranteed.
Description
technical field [0001] The invention belongs to the field of electromechanical equipment control, and in particular relates to a control method for a high-efficiency variable-frequency constant-pressure water supply system based on an inverse method. Background technique [0002] As a high-energy-consuming general-purpose machine, water pumps are widely used in various fields of industrial and agricultural production and residents' lives. The annual electric energy consumed by water pump units accounts for more than 21% of the country's total electricity consumption, and accounts for 30% of the production cost in water supply enterprises. %~60%. Even if the efficiency of water pumps and water pump systems is only increased by 1%, it will bring huge benefits to global energy conservation and environmental protection, and 30% to 50% of the electric energy consumed by water pumps can be saved. By adopting frequency conversion control technology, the energy consumption of water...
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IPC IPC(8): G05B13/04E03B11/16
Inventor 彭志辉李峰平赵军平付培红胡雪林
Owner 台州沃夫森泵业有限公司