Method for controlling pipe network pressure-superposed water supply system based on efficiency optimization of asynchronous motor
A technology for asynchronous motors and efficiency optimization, applied in water supply pipeline systems, water supply devices, water supply main pipelines, etc., can solve the problems that cannot directly detect the torque and speed requirements of asynchronous motors, and cannot be directly applied to water supply systems
Inactive Publication Date: 2010-11-24
TIANJIN GANQUAN GROUP
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However, since the torque and speed requirements of the asynchronous motor cannot be directly detected when the asynchronous motor is loaded with a water pump, this algorithm cannot be directly applied to the water supply system
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[0037] Specific embodiments: a method for controlling a pipe network superimposed water supply system based on efficiency optimization of asynchronous motors in the present invention identifies the rotational speed of the asynchronous motor based on the water pump model, and uses the identified rotational speed as the input of the optimal control algorithm for the minimum loss efficiency of the asynchronous motor. The above operations are completed in the digital control unit, and output to the frequency given terminal of the inverter through D\A conversion, and the pressure value of the water pump collected by the pressure sensor is compared with the pressure design value to obtain the error signal ΔH of the water pressure. For ΔH Carry out PI operation, and output to the voltage given terminal of the frequency converter through D\A conversion.
[0038] The pipe network superimposed water supply system is mainly composed of a frequency converter, a water pump unit, a pressure ...
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The invention relates to a method for controlling a pipe network pressure-superposed water supply system, in particular to a method for controlling a pipe network pressure-superposed water supply system based on efficiency optimization of an asynchronous motor. The method identifies the rotating speed of the asynchronous motor based on a pump model, and takes the identified rotating speed as an input of a minimum loss efficiency optimizing control algorithm of the asynchronous motor, the operation is finished in a digital control unit and is output to the frequency given end of a transducer through D / A conversion, the set pressure value is subtracted from the water pump pressure value collected by a pressure sensor to obtain the error signal delta H of the water pressure, PI operation is carried out on delta H, and then delta H is output to the voltage given end of the transducer by D / A conversion. The invention has the beneficial effects that the operation efficiency of the asynchronous motor is increased, the operation efficiency of the system can be improved, the problem that the rotating speed of the water pump machine set is difficult to be detected directly is solved, and the load characteristics of the water pump in the pressure-superposed water supply system is analyzed, therefore, the attention on energy-saving potential of optimization control of the water pump machine set can be enhanced in engineering fields.
Description
technical field [0001] The invention relates to a control method for a pipe network superimposed water supply system, in particular to a control method for a pipe network superimposed water supply system based on efficiency optimization of an asynchronous motor. Background technique [0002] At present, the control method of asynchronous motors commonly used in variable frequency speed regulation water supply systems is constant voltage frequency ratio control. Due to the characteristics of water supply systems and the load characteristics of water pumps, asynchronous motors often operate with light loads, and their operating efficiency is low. The water pump is a load that does not require high dynamic performance response. When the asynchronous motor is running at light load, the constant flux control method is not necessary, and the efficiency can be optimized through the flux-weakening control. There is a large energy-saving potential in the water supply system. [0003]...
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Login to View More IPC IPC(8): E03B11/16E03B5/00E03B7/07
Inventor 马恩成柴秀强
Owner TIANJIN GANQUAN GROUP