Abstract
Energy efficiency optimization techniques of electrical drive systems improve the overall efficiency and reduce the hardness of mechanical characteristics of the drive system. It is therefore important to reduce the slip of induction motor to maintain its stable operation at different frequencies and loads. In this paper a slip compensator, based on fuzzy logic incremental controller has been developed to improve the steady state performance of efficiency-optimized three-phase induction motor drive system. The slip control is accomplished through a fuzzy controller with 9 rules, taking speed error and speed error variation as inputs, to produce the frequency. The proposed controller reduces the slip occurring at low frequencies and light loads to certain value, and also reduces the energy efficiency of the system.
Highlights
Induction motors are the most used in industry since they are rugged, inexpensive, and are maintenance free
It is important to optimize the efficiency of the motor drive systems if significant energy saving are to be obtained
A Matlab Simulink model for the studied drive system, containing V = const controller, efficiency optimizaf tion controller based on search model, and slip compensator, based on fuzzy logic incremental controller, was efficiency in the system with = const controller and f efficiency optimizer
Summary
Induction motors are the most used in industry since they are rugged, inexpensive, and are maintenance free. It is important to optimize the efficiency of the motor drive systems if significant energy saving are to be obtained. There are two main approaches to improve the induction motor efficiency at light loads and low frequencies, namely loss model control and search model control [1,2,3,4]. Efficiency optimization affects some of the motor performance indicators, such as maximum torque, magnetic flux, and slip. It is important to insert some compensation into the drive system to keep the maximum torque or magnetic flux constant for all operating frequencies. A fuzzy logic incremental controller has been developed to reduce the slip in efficiency-optimized three-phase induction motor drive. The proposed controller was validated by simulation results of Matlab Simulink model of the drive system
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