Simple Hybrid Model for Efficiency Optimization of Induction Motor Drives with Its Experimental Validation (original) (raw)
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New hybrid model for efficiency optimization of induction motor drives
2010
New hybrid model for efficiency optimization of induction motor drives is presented in this paper. It combines two strategies for efficiency optimization: Loss model control and Search control. Search control technique is used in a steady state of drive and loss model during transient processes. As a result, power and energy losses are reduced, especially when load torque is significant less related to its rated value. Also, this hybrid method gives fast convergence to operating point of minimal power losses and shows negligible sensitivity to motor parameter changes regarding other published optimization strategies. This model is implemented in vector control induction motor drive and some simulations are performed. Results are presented in this paper.
Efficiency Optimization of Induction Motor Drive
Induction motors are extensively used in industrial and household appliances and consume more than 50% of the total generated electrical energy. The need for energy conservation is increasing the requirements for saving the electrical energy. It is therefore important to optimize the efficiency of electrical drive systems under light load condition. This paper proposes a control scheme based on search method taking advantage of the fact, that at a certain torque and speed (operating point) there is only one set of voltage & frequency that operates the motor at optimum efficiency. Utilizing equivalent loss model of induction motor, expressions of V opt , F opt are derived mathematically. Both simulation & experiment results indicates the efficiency performance with VVVF is superior to that of V/F operation in steady state and light load conditions. Future work is also suggested that if incase any frequent transients comes in load side, the optimization schemes can be abandoned & V/F operation should be implemented till the steady state comes.
Efficiency Optimization of Induction Motor Drives
2013
The paper describes the most commonly used method for efficiency optimization of induction motor drives (IMD). Simple state control, Model based and Search control. They have been analyzed and pointed out good sides and drawbacks of every method. An algorithm for efficiency optimization of IMD that work in periodic closed cycle operation cycles and known operating conditions is also presented. The used algorithm is based on the technique of dynamic programming. This model is implemented in vector control induction motor drive. Simulations and experimental test are performed. Results are presented in the paper.
Efficiency and Performance Optimization of Induction Motor Drive
Induction Motor(IM) are known for its power/mass ratio, its efficiency, low cost and maintenance free performance during its life cycle therefore known as workhorses of industries. But huge amount of energy is wasted by IM due to their poor efficiency, also the operating cost is high. Therefore a small increment in efficiency may lead to contribute huge significant effect on the entire energy saving. The main key features in which estimation and reproduction of optimal flux component of current (Ids) depends, are loss model control (LMC) and search control (SC). To drive loss-minimization expression, core saturation is considered with d-q loss model of IM. Ids value expression for various load profiles, this loss expression is used to derive optimal Ids expression and tabulation is done. According to the table, a model is designed. The optimal Ids* value can be calculated, which depends upon run-time profile, followed by feed-forward manner and thus eliminates complex computation of run time loss model. Comparison is done between proposed operation that is optimal Ids and constant Ids obtained by conventional method. Increment of 1-12% efficiency is observed.
Efficiency Optimized Control of High Performance Induction Motor Drive
2009
Algorithms for efficiency optimized control of induction motor drives are presented in this paper. As a result, power and energy losses are reduced, especially when load torque is significant less compared to its rated value. According to the literture, there are three strategies for dealing with the problem of efficiency optimization of the induction motor drive: Simple State Control, Loss Model Control and Search Control. Basic characteristics each of these algorithms and their implementation in induction motor drives are described. Moreover, induction motor drive is often used in a high performance applications. Vector Control or Direct Torque Control are the most commonly used control techniques in these applications. These control methods enable software implementation of different algorithms for efficiency improvement. Simulation and experimental tests for some algorithms are performed and results are presented.
On-Line Efficiency Improvement of Induction Motor Vector Controlled
Advances in Electrical and Electronic Engineering, 2016
Efficiency improvement is an important challenge for electric motor driven systems. For an induction motor, operation under rated conditions (at rated load with rated flux) is very efficient. However, in many situations, operation with rated flux causes low efficiency especially at light load ranges. In these applications, induction motor should operate at reduced flux which causes a balance between iron losses and copper losses leading to an improved efficiency. This paper concerns energy optimization, i.e. efficiency improvement is carried out via a controller designed on the basis of imposing the rated power factor, by finding a relationship between rotor flux and torque current component which can optimize the compromise between torque and efficiency in steady state as well as in transient state. Experimental results are presented to prove the effectiveness and validity of the proposed controller.
Induction motor drive design based on efficiency optimization and drive loss minimization
2017 10th International Symposium on Advanced Topics in Electrical Engineering (ATEE), 2017
Induction motor drives are commonly used for applications with vast variations in mechanical load for torques under nominal values. HVAC loads are among these loads. The most ideal scheme for induction motor drive design should include drive loss reduction, or efficiency improvement, proportional to load torque such that optimal performance of drive is not affected. In this paper, using analytical methods, an accurate model is proposed for induction motor drive design. This model allows us to utilize real control and classical control theory for better performance of drive control system. The most damaging mechanical load for induction motor drive is impulse load or so-called periodic load. A scheme proposed for power loss control includes loss control for this type of load, meanwhile, robustness of drive system and stator frequency stability are retained. Main advantages for this scheme are applicability and implementation on various induction motor drives with various powers, without any specific requirements and the least possible computation for the processors.
Dynamic search technique for efficiency optimization for variable speed induction machine
2009 4th IEEE Conference on Industrial Electronics and Applications, 2009
This paper proposes a dynamic search algorithm (DSA) based loss model controller (LMC) for the online efficiency optimization of induction motor drives. The algorithm incorporates a fast search process and a simplified loss modelbased control, while updating the equivalent core loss resistance in the model. It ensures very fast convergence without any torque pulsations and a priori knowledge of the motor loss related parameters. A simplified d-q based model for the motor and the loss function is proposed to arrive at an approximate flux reference for any operating point. Then this flux reference is modified through a dynamic search algorithm (DSA) for optimal operating point at any load condition. The approach is simple and requires no additional hardware for practical implementation. Simulation and suitable experiments show a close agreement to confirm the validity and usefulness of the proposed technique.
Efficiency Optimisation of 3-phase Induction Motor Drive Using 'Optimal Controller'
sathya, 2015
This project explains mathematical-based scheme for Induction motor drive system leading to efficiency optimization using with torque of the motor to generate the appropriate voltage amplitude. A constant v/f efficiency controller model can be developed with LOSS MODEL technique. In this optimal controller CURVE FITTING model is used.
2013
This paper introduces an energy efficient induction motor drive suitable to operate at light load conditions. The iron losses in the induction motor are significant when the machine is operated below the rated conditions. The efficiency of the motor can be increased by keeping the flux level below the rated value. In this paper, the efficiency of the induction motor has been improved by incorporating an efficiency optimization algorithm. Efficiency optimization algorithm provides an optimum value of flux generating direct axis stator current, which controls the magnitude of the rotor flux. At light loads, the optimization algorithm weakens the rotor flux from its rated value, thus reducing the core losses. A 5.4-hp induction motor drive is simulated in SIMULINK to analyze the efficiency under different operating conditions of the drive. The variation of efficiency under load change and speed change is observed. Simulation results show that efficiency increases as the operation of in...