Research On The Integrated Intelligent Drive Control Method Of Impeller Pump And Equipment Development

As the main energy-consuming equipment in industrial production,the impeller pump consumes about 15% of the country's total power generation.Due to the unreasonable power supply in the impeller pump application,a large amount of energy has not been fully utilized.Therefore,the variable frequency drive control technology is the main technical methods to reduce the energy consumption of water pump.However,the existing variable frequency drives that integrate multiple control methods are expensive,bulky,and difficult to operate and maintain,and have many deficiencies.Therefore,this paper takes impeller pumps,motors and other drive control equipment as the research objects,explores the suitable variable frequency drive control method for impeller pump through theoretical analysis,simulation and verification tests,a SVPWM control algorithm based on constant voltage frequency ratio control is proposed,and then combines the actual application of impeller pump to develop a favorable,efficient and energy-saving drive control device for impeller pump.The research content,conclusions and innovation of this paper are as follows:1.The research of driving control method suitable for impeller pump is conducted.Through the combination of simulation and testing,the paper studies the indicator of the operating characteristics of the impeller pump under the constant voltage frequency ration control and vector control,and proposes that the former method is suitable for drive control of impeller pumps.The results show that in terms of control performance,the vector control response is faster than that of constant voltage frequent ratio control under the same operating conditions,but the sine and symmetry of the stator current change curve under constant voltage frequency ratio control is obviously better than vector control,besides severe distortion occurred at the tail of the response current;in terms of control accuracy,the torque accuracy of the constant voltage frequency ratio control is much higher than that of the vector control under the condition of frequency conversion,in addition,its speed regulation range of the instantaneous speed is significantly smaller than the vector control;in terms of the stability,the rms value and overshoot of the speed under constant voltage frequency ration control are smaller than that under vector control.2.In view of the problems of large harmonic components and large torque ripple of the output current waveform under the constant voltage frequency ratio control of the existing general-purpose driver,this paper puts forward a SVPWM control algorithm based on constant voltage frequency ratio control.The algorithm calculate the action time and sequence of the switching device(IGBT)through the determination of the target voltage sector and action vector base voltage,and finally control the duty cycle and period of six seven-segment PWM waveforms of the circuit outputs to control the inverter circuit output stator voltage,so as to achieve the drive control of the motor and pump.The improved algorithm effectively reduce the harmonic proportion and torque ripple.3.In terms of the general-purpose driver problems of the cost,maintenance and specific functions that are not fully optimized,a sample device of the impeller pump integrated intelligent drive control device,which is of low cost,small size,and is efficient and energysaving was developed.In terms of the hardware design,the system is composed of main circuit,detection circuit,drive circuit,control circuit,and communication circuit and other module circuits;in terms of software design,programming is performed according to the control algorithm and the functional requirements of each module circuit.Finally,the sample device is verified through experiments.The results show that,through the analysis of the flow-inlet pressure change curve and the flow-outlet pressure change curve under different working conditions to verify the feasibility of the sample devices,the harmonic component of the output phase current is less than 0.5%.Therefore,the sample device conforms to national standards for variable frequency drive control equipment.