A Quantitative Performance Analysis in Low-Voltage Conditions
| Author: |
M. Ishtiaque Rahman and Khosru M. Salim |
| Abstract: |
Voltage variation is a common problem in Bangladesh. This gives rise to a considerable decline in the efficiency of motors that are employed in industries. If dynamic change in frequency can be provided in response to the voltage variation, the system efficiency can be enhanced to a significant degree. This paper compares two three-phase motor-pump systems. The first scheme is a model of the conventional motor-pump structure currently employed in industries, consisting of a three phase induction motor and a centrifugal pump. The second scheme incorporates a variable frequency drive (VFD) into the motor-pump system.
This paper aims to evaluate the performance of each system with regards to power consumption at voltages that are lower than the rated voltage of the motor, as a means to demonstrate the advantage offered by the VFD. Simulation is done in MATLAB Simulink. The results show that, in low-voltage conditions, the system containing VFD exhibits near-constant efficiency throughout the entire voltage range, whereas the conventional system suffers from great reduction in efficiency accompanied by a decreasing voltage. Thus, it has been quantitatively proven in this paper that a VFD is an extremely beneficial tool in preserving the efficiency of a motor-pump system in low-voltage conditions.
|
| Proposed design/diagram: |
|
| Prototype/ Experiment: |
|
| Video: |
|
| Paper link: |
|
| Present status: |
|
