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The Study of the Control Technology on the Green and High Efficiency Photovoltaic Water Pumping Systems

Author: ZhaoYan
Tutor: ZuoMeiQin
School: Hefei University of Technology
Course: Power Electronics and Power Drives
Keywords: PV water pumps No position sensor brushless DC motor Virtual midpoint method Pump group control technology
CLC: TM921.5
Type: Master's thesis
Year: 2004
Downloads: 237
Quote: 2
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Abstract


Photovoltaic pumping systems is the direct use of solar cells photovoltaic effect power generation , in rivers, lakes or deep well to achieve water pumping system through a series of power electronics , motor , water machine control and enforcement aspects of the system comes to light, machine , electricity, control technology , such as a variety of cross-disciplinary . Photovoltaic pumping systems for photovoltaic pumping systems developed in recent years a new type of sensorless permanent magnet DC brushless motor drive , its drive motor control technology were in-depth and meticulous research . The system uses a control chip for the JK3CE the MOTOROLA series of microcontroller , anti- electric potential zero can be obtained by comparing the motor terminal voltage and the virtual midpoint voltage , the zero-crossing signal sent to the microcontroller to capture the port by the system software to determine the commutation time , so that you can change by the electronic device to device alternative mechanical commutation conducive to improve the system's reliability and reduces the cost of system maintenance . The system design of the software , the timer interrupt time shortened by 100us to 25us , a timer interrupt time for the phase adjustment step , thus improving the accuracy of the phase adjustment . Phase adjustment with variable coefficients proportional component , can automatically adjust the number of steps , according to the size of the phase difference value , phase adjustment process more quickly . Starting way to improve development by stepping starter for the whole process of self-synchronizing Starting method , improved starting mode can effectively reduce the starting current , and shorten the start-up time , conducive to resolving the problem of group control operation of the starter to promote the development of the group control technology .

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CLC: > Industrial Technology > Electrotechnical > Electrification,electrical energy application > Electric drive ( electric drive ) > Control system
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