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Anfis controller based power factor improvement for induction motor using hybrid inverter.


The main goals of this observe is to layout a strength saving scheme for an industrial distribution network. This may be done by means of lowering the community losses and improving the main electric load operation to a better efficiency level. The linear aggregate of genuine electricity and reactive strength is called apparent power. Low power thing isn't that a great deal problem in domestic's location however it will become a trouble in industry in which a couple of big automobiles are used so there's requirement to correct the electricity issue. There are numerous advantages to having power thing correction. The strength detail control is one of the most important instructions in energy electronics research. Lately, the paintings on this area have been facilitated thru the development of the modern-day supply inverter using easy switching strategies. In the remaining decade, a few researchers have manifested hobby in improving the performances of the wound induction tool by way of manner of using current deliver inverter.

The handiest viable source of excitation in an induction gadget is the stator input. The induction motor therefore needs to operate at a lagging electricity thing. This strength factor could be very low at no load and increases to about 85 to 90 percent at full load, the development being as a result of the multiplied real-energy necessities with increasing load. The presence of air-gap between the stator coil associated rotors of an induction motor greatly will increase the reluctance of the magnetic circuit. Induction motor speed can be control via using fuzzy good judgment controller and the simulation model of Induction motor power the usage of MATLAB/SIMULINK.

The voltage source inverter (VSI) fed drives are most broadly used in low and medium electricity applications, however now not used extensively in high power applications. Nowadays CSI drives are rent self commutating devices together with gate turn-off thyristors (GTOs) in place of SCRs as within the past. To get stepped forward output currents and voltages Pulse width modulation (PWM) strategies are used.

The effectiveness of the proposed control was demonstrated through comparison with some commonly employed control methods, through an extensive set of simulations using MATLAB/ Simulink Sim Power Systems toolbox. All the above papers explained fuzzy logic controller based power factor improvement of induction motor by using current source inverter. But in this paper explain voltage and current is control in the inverter itself and controlled voltage and current is given to the induction motor to maintain high power factor through anfis controller.

Induction motor drive:

An electrical motor is such an electromechanical device which converts electrical electricity into a mechanical strength. Maximum widely used motor is 3 phase induction motor as this kind of motor does not require any beginning device or we are able to say they're self beginning induction motor. For better know-how the precept of 3 phase induction motor, the basic constructional characteristic of this motor need to be known to us. This Motor consists of two most important elements.

A. Stator:

Stator of three phase induction motor is made from numbers of slots to assemble a 3 section winding circuit that is linked to a 3 phase AC supply. Stator diagram is shown in fig. 2.1. The 3 section winding are arranged in this kind of way inside the slots that they produce a rotating magnetic field after 3 Phase. AC supply is given to them.

B. Rotor:

Rotor of 3 phase induction motor includes cylindrical laminated middle with parallel slots that can bring conductors. Conductors are heavy copper or aluminum bars which suits in every slots & they're brief circuited via the cease rings. Squirrel cage rotor is shown in fig. 2.2. The slots are not exactly made parallel to the axis of the shaft but are slotted a touch skewed due to the fact this association reduces magnetic buzzing noise & can avoid stalling of motor

The difference between the synchronous speed (Ns) and actual speed (N) of the rotor is called as slip.

% slip s = Ns - N/Ns x 100

The rotational speed of the rotating magnetic field is called as synchronous speed.

Ns = 120 x f/P (RPM)

Where, f = frequency of the supply P = number of poles

Here, to send the feedback of position and speed of the motor Hall-effect sensors are used. In addition to the switching for a rated speed of the motor, an additional electronic circuitry changes the motor speed based on required application. Induction motor drive is shown in fig. 2.3. These speed control units are implemented with ANFIS controller to have accurate control.


3.1 Anfis controller:

An adaptive neuro-fuzzy inference system or adaptive community-primarily based fuzzy inference device (ANFIS) is a form of artificial neural network that is primarily based on Takagi-Sugeno fuzzy inference machine. Because it integrates each neural networks and fuzzy good judgment standards, it has capability to capture the blessings of each in an unmarried framework. Its inference machine corresponds to a hard and fast of fuzzy IF-THEN policies which have studying functionality to approximate nonlinear features. Consequently, ANFIS is considered to be an established estimator. For the usage of the ANFIS in an extra green and most beneficial way, one can use the best parameters received through genetic set of rules Consider a Sugeno type of fuzzy system having the rule base

1. If x is A1 andy is B1, then [f.sub.1] = [c.sub.11]x + [c.sub.12]y + [c.sub.10]

2. If x is A2 andy is B2, then [f.sub.2] = [c.sub.21]x + [c.sub.22]y + [c.sub.20]

The structure of the ANFIS network is shown in fig 3.1. All computations can be presented in a diagram form. ANFIS normally has 5 layers of neurons of which neurons in the same layer are of the same function family.

Modeling and simulation of power factor improvement for induction motor:

The proposed system using ANFIS controller is implemented for power factor improvement of Induction motor. Fig 4.1 shows simulation model of ANFIS controller based power factor improvement of Induction motor.

This simulation model consists of four sub blocks named as Induction model block, Inverter block, controller and subsystem. The subsystem 1 for gate signal it's given in the form of angle (0).

The performance of induction motor is analyzed by using Mat lab. Induction motor blocks itself the EMF, current, voltage and power factor blocks are present. The duty cycle of the power electronics devices such as MOSFET, IGBT are controlled by fuzzy controller. The feedback of actual power factor value is taken from the induction motor and given to the fuzzy controller along with reference value. Simulation of power factor calculation is shown in Fig 4.1

The proposed simulation version of induction motor power is showing in fig 4.1. The parameters of the percent based hybrid inverter are designed such, that it operates in DICM to gain inherent energy component correction at ac mains. Reference voltage is calculated from controller, as it's miles at once proportional to the carried out dc hyperlink voltage at a given load. electronic commutation is based totally at the signals of position sensing corridor sensors placed in the motor.

Performance analysis of induction motor:

5.1 Waveform of source voltage and current:

In this proposed simulation diagram, the AC source voltage of 220 V and source current of 4.12A is applied and waveforms corresponding to this ratings are obtained and displayed. Figure 5.1 shows the waveform of source voltage of 220V and source current of 4.12A.

5.2 Waveforms of phase voltage and line current:

The waveform of phase voltage of induction motor drive is shown in figure 5.2 and in this, the phase voltage is given in volts and is measured in terms of time in seconds and figure 5.3 includes the diagram of line current of induction motor drive.

5.3 Improved power factor:

Fig 5.4 shows the power factor rating when the source voltage and current is maintained at 220V and 4.02A respectively. It shows that the power factor is maintained 0.9532 in the input side of the proposed drive.

On comparing the existing and proposed model, the proposed method i.e. the hybrid inverter fed induction motor drive has ensured the high power factor of about 0.95 which nearly a unity power factor and also improves the performance of the system.


The project work has presented the hybrid inverter to feed an Induction motor drive. Initially, the important characteristics of induction motor was presented as well as, its electric model necessary for the design of integrated topology. The proposed circuit is designed for CCM operation, so that the inverter could be represented as an equivalent resistance. A current sensor is used to measure the current in induction motor to reduce the low power factor. The integration of two stages reduced the system size and cost. A hybrid inverter derived electricity issue correction topology for induction Motor the use of ANFIS good judgment controller has been supplied. The advantages of this proposed gadget is less cost, one level of electricity conversion, easy comments manipulate, and electricity issue is nearer to team spirit. The ANFIS good judgment controller is implemented to force the inverter and it operates in non-stop conduction mode. By designing the converter to perform in continuous conduction mode, the modern-day strain is sincerely much less and the life of the gadget may be advanced. On comparing the existing and proposed model, the proposed method i.e. the hybrid inverter fed Induction motor drive has ensured the high power factor of about 0.95 which nearly a unity power factor and also improves the performance of the system. The entire System was designed and implemented in MATLAB/SIMULINK. The performance of the system for the extraordinary values of enter AC voltage has been evaluated and discovered excellent.


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[2.] Klein, J., M.K. Nalbant, 1990. "Power Factor Correction--Incentives, Standards and Techniques", PCIM Conf. proc., pp: 26,28-31.

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[7.] Dong-Choon, L. and K. Young-Sin, 2007. "Control of Single-Phase-to-Three-Phase AC/DC/AC PWM Converters for Induction Motor Drives," IEEE Trans. On Ind. Electronics, 54(2).

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(1) S.Mahendran, (2) S. Naga pavithra, (3) S. Umamaheswari

(1,2,3) Department of Electrical and Electronics Engineering Mahendra Engineering College, Mahendhirapuri, Mallasamudram, Namakkal Dt-637503.

Received 28 January 2017; Accepted 22 March 2017; Available online 28 April 2017

Address For Correspondence:

S.Mahendran, Department of Electrical and Electronics Engineering Mahendra Engineering College, Mahendhirapuri, Mallasamudram, Namakkal Dt-637503.


Caption: Fig. 2.1: Diagram of stator.

Caption: Fig. 2.2: Diagram of Squirrel cage rotor.

Caption: Fig. 2.3: Circuit diagram for induction motor drive

Caption: Fig 3.1: Structure of the ANFIS network

Caption: Fig. 4.1: Simulation model of Power factor calculation

Caption: Fig. 4.2: Simulation model of Induction motor drive

Caption: Fig. 5.1: Waveform of source voltage and current

Caption: Fig. 5.2: Waveform of phase voltage in volts.

Caption: Fig. 5.3: Waveform of line current in amps.

Caption: Fig. 5.4: Waveform power factor value.
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Author:Mahendran, S.; Naga pavithra, S.; Umamaheswari, S.
Publication:Advances in Natural and Applied Sciences
Date:Apr 30, 2017
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