Abstract
In this paper, the efficiency analysis of an induction motor with field-oriented control (FOC) at a hot rolling mill in South Africa is presented. It is shown that the energy consumption of an induction motor at a hot rolling mill can be improved with the introduction of FOC with a variable input reference compared to direct torque and flux control (DTC) with a fixed input reference. An overview on the control process of the induction motor with FOC and the schematics of the field-oriented controller are presented. Results for the following two scenarios are presented: 1) the induction motor is controlled at a constant speed with a variable thickness slab by means of DTC and 2) the induction motor is controlled according to the thickness of the slab by means of FOC. Overall results obtained showed an average improvement of 3.67% in the energy consumption of the experimental test setup system from scenario 1 to scenario 2. The simulation and experimental results that illustrate the performances of the proposed scenarios are also presented. Key words: Induction motor, field-oriented control, hot rolling mill, energy efficiency.
Highlights
It is estimated that globally around 40% of the electricity supplied to the industrial sector is consumed by electric motorised systems and for South Africa induction machines in the industrial sector consume around 60% of the electricity supplied (DME, 1998)
It is shown that the energy consumption of an induction motor at a hot rolling mill can be improved with the introduction of field-oriented control (FOC) with a variable input reference compared to direct torque and flux control (DTC) with a fixed input reference
It is shown that the energy consumption of an induction motor at a hot rolling mill can be improved with the introduction of FOC with a variable input reference compared to direct torque and flux control (DTC) with a fixed input reference, which is the contribution of this project
Summary
It is estimated that globally around 40% of the electricity supplied to the industrial sector is consumed by electric motorised systems and for South Africa induction machines in the industrial sector consume around 60% of the electricity supplied (DME, 1998). The efficiency analysis of an induction motor with field-oriented control (FOC) at a hot rolling mill in South Africa is presented. It is shown that the energy consumption of an induction motor at a hot rolling mill can be improved with the introduction of FOC with a variable input reference compared to direct torque and flux control (DTC) with a fixed input reference, which is the contribution of this project. Gouws (2011) provide the analysis of an induction motor with DTC at a hot rolling mill in South Africa and emphasize that other control techniques might provide better results in terms of energy consumption (and energy efficiency). This article compares the performance and energy consumption of the direct torque and flux controller with the field-oriented controller at a hot rolling mill in South Africa. Efficiency analysis for the following two scenarios are presented: 1) where the speed of the induction motor is kept constant with a variable thickness slab (original condition with DTC) and 2) where the speed of the induction motor is controlled according to the thickness of the slab (improved condition with FOC)
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