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ARTICLE

Improved Clamped Diode Based Z-Source Network for Three Phase Induction Motor

D. Bensiker Raja Singh1,*, R. Suja Mani Malar2

1 Anna University, Chennai, 600025, Tamilnadu, India
2 DMI College of Engineering, Chennai, 600123, Tamilnadu, India

* Corresponding Author: D. Bensiker Raja Singh. Email: email

Intelligent Automation & Soft Computing 2023, 36(1), 683-702. https://doi.org/10.32604/iasc.2023.028492

Abstract

The 3Φ induction motor is a broadly used electric machine in industrial applications, which plays a vital role in industries because of having plenty of beneficial impacts like low cost and easiness but the problems like decrease in motor speed due to load, high consumption of current and high ripple occurrence of ripples have reduced its preferences. The ultimate objective of this study is to control change in motor speed due to load variations. An improved Trans Z Source Inverter (ΓZSI) with a clamping diode is employed to maintain constant input voltage, reduce ripples and voltage overshoot. To operate induction motor at rated speed, different controllers are used. The conventional Proportional-Integral (PI) controller suffers from high settling time and maximum peak overshoot. To overcome these limitations, Fractional Order Proportional Integral Derivative (FOPID) controller optimized by Gray Wolf Optimization (GWO) technique is employed to provide better performance by eliminating maximum peak overshoot problems. The proposed speed controller provides good dynamic response and controls the induction motor more effectively. The complete setup is implemented in MATLAB Simulation to verify the simulation results. The proposed approach provides optimal performance with high torque and speed along with less steady state error.

Keywords


1  Introduction

In many industrial applications and irrigation systems, three phase induction motors are most commonly used. For several applications, fundamental field oriented control is realized by means of simple, easy control and highly efficient conventional cascade PI control system. The adaptive controller is designed for induction motor drives with inaccurate model to control speed but it has a drawback of high complexity [1]. An entire nonlinear modelling scheme of voltage source converter fed induction motor is introduced with a nonlinear dynamic controller to attain exact motor speed control with minimal losses [2]. A comparative analysis of two prognostic speed control methods of induction motor like set-model prognostic control of finite control and asset-model prognostic continuous control of motor speed is introduced. These control schemes show good dynamic behaviour by maintaining all system variables within a standard value. The current ripple and computational complexity are less in set-model prognostic continuous motor control [3]. The doubly fed induction motor speed control with and without current feedback using novel algorithm based Voltage Control (VC) on rotor-side converter is presented in [4]. Current control is somewhat more complex with current feedback but it offers improved tracking with minimum peak current in rotor. An induction motor model with known regressors is used in [5], where an adaptive speed control is presented. This model offers precise evaluation of stator and rotor side resistances during the function of both motoring and regenerating.

A new and robust control is introduced in [6]. Unlike the existing higher order auto disturbance rejection controller based speed control system, this method requires no rotor flux for evaluation. Without considering the load, the proposed control method minimizes the peak value of five-leg voltage source inverter and operates the motors at identical speed [7]. A novel single level high boost quasi-ZSI is implemented in [8]. This method has a high potential boost factor and it flows incessant current at input side. One of the most commonly employed control system for adjustable speed-motor drive is PI controller. Under lower frequency disturbances, this controller has the capability to make zero steady-state error [9]. A modified DC–DC converter is introduced to attain high gain using quasi-Z source inverter along with switched capacitor networks [10].

In single-phase qZSI PV system, a novel control scheme is suggested to minimize the requirement of capacitance [11]. A variable shoot through duty cycle for Quasi-Z Source Indirect Matrix Converter fed Induction Motor (IM) for flow control on the basis of Fuzzy Logic Controller (FLC) of Dye pump is presented [12]. The FLC gives improved speed response than conventional PI controller. As front-end converter, a modified Quasi ZSC is presented to control input potential in order to improve behaviour of Switched Reluctance Motor (SRM). This system increases the power output [13]. In order to derive analytical expressions of system stress, the combination of double line frequency pulsation along with switching ripples are used. The description of passive component volume problem is given for Double-Line-Frequency (DLF) passive suppression scheme from stress aspect [14,15].

A speed controller aimed at indirect field concerned with the IM drives control using FLC is developed [16]. This proposed FLC enhances the dynamic response and reduces the burden of computation. The use of FLC as an Induction Motor speed control [17] is gaining much interest by researchers as it has proved to attain better performance [18]. This model modulates the magnitude and frequency of motor stator voltage to retain constant rotor speed [19]. For IM with input saturation, fuzzy based finite-time command filter location tracking control system is developed [2022].

An improved ΓZSI with a clamping diode is employed in this proposed work. The main aim is to control speed that varies with load. To operate IM at rated speed, different controllers are used to control the voltage source inverter. With conventional PI controller, settling time increases and maximum peak overshoot occurs. To overcome these limitations, FOPID controller is employed with GWO technique to eliminate maximum peak overshoot problems.

2  Proposed System

The block representation of the entire work is presented in Fig. 1. It consists of diode bridge rectifier, Γ-Z-source inverter and 3Ф Voltage Source Inverter (VSI). Different controllers are employed to control the speed in 3Ф IM.

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Figure 1: Proposed block diagram

3Φ AC supply is given to the diode bridge rectifier. In 3Ф induction motor, the speed decreases due to load and the ripples get injected. This ripples get increased with the increase in speed. Due to this oscillation, the produced back emf is increased and it affects the source voltage. In order to rectify source voltage problem, diode bridge rectifier is employed, which involves in converting AC to DC. The output of diode bridge rectifier is given to improved ΓZSI, which significantly enhances the low DC voltage and minimizes the ripples in input voltage. The output of ΓZSI is fed to 3Ф induction motor through 3Ф VSI. The improved ΓZSI operates in shoot through mode to prevent short circuit problem. The current when pass through the short circuit side gets charged immediately. Advantages of this inverter are constant input voltage, reduction of ripples and voltage overshoots due to an additional clamping diode and high output voltage.

3  Modeling of Propose System

3.1 Modeling of Improved ΓZSI

Basic structure of the proposed inverter is depicted at Fig. 2. An improved ΓZSI uses fewer components to get high voltage gain by using a greater modulation index, which in turn results in lesser shoot-through duty cycle. Additionally, output voltage of improved ΓZSI is tuned within a tapered range of 1<n2 by varying turn’s ratio of magnetic component.

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Figure 2: Circuit diagram of improved ΓZSI

An improved ΓZSI boost Factor (B) is expressed as,

B=vpnVin=1(1(1+1n1)D) (1)

Here, D signifies the duty cycle whereas n signifies the coupled inductor’s turns ratio.

Characteristic of improved ΓZSI are given below,

1.    In improved ΓZSI, input current is continuous and there is no need for any extra filter.

2.    Unlike Trans-ZSI, tZSI and ΓZSI, it delivers startup inrush current suppression since there is no current flow at startup to the major circuit.

3.    It has maximum voltage gain. An improved ΓZSI uses lesser shoot through duty cycle with similar input or output states, which in turn results in lesser voltage stress and improved power quality output.

Mode 1: Shoot-through mode

Improved ΓZSI with clamping diodes circuit of mode 1 is depicted in Fig. 3.

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Figure 3: Mode 1

All switches of same legs are switched ON in shoot-through mode and network is similar to short circuit. In this mode, diodes D1andD2 are switched OFF as well as windings 1and2 are charged through current capacitor C1 .

Mode 2: Non-Shoot-through mode

The circuit of improved ΓZSI in mode 2 is depicted in Fig. 4.

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Figure 4: Mode 2

It contains two zero modes as well as six active modes. Diodes D1andD2 are turned ON in this mode and energy stored in windings are delivered into the circuit as well as load whereas the capacitors C1andC2 are charged. Energy stored in leakage inductance is taken through capacitances C1andC2 through diode D2 during this state also reprocess without producing potential spike.

3.1.1 Boost Capacity of Improved ΓZSI

DC-link voltage ratio at bridge inverter is known as boost factor of inverter. A simplified circuits of improved ΓZSI inverter during mode 1 and mode 2 are depicted in Fig. 5.

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Figure 5: Simplified circuits of improved ΓZSI

Apply KVL in shoot through mode,

{Vc1+vL2_shvL1_sh=0vL1_sh=vL2_shVc1(i)n=VL1VL2Vin+vL3_shVc2=0vL3_sh=Vin+Vc2(ii) (2)

Similarly, Apply Kirchhoff’s Voltage Law in non-shoot through mode,

{Vc1vL2_non+vL1_non+vpn=0VinvL3_non+vL2_non+Vc1=0vL3_non=Vin+vL2_non+Vc1vL3_non=vpnVinVc2(iii)vL1_non=Vc2nvL2_non=Vc2 (3)

Here, the input voltage is specified as Vin , voltage across shunt inductors is specified as vL1_sh,vL2_sh and capacitor voltage is specified as Vc1 . Across L1andL2 apply volt-sec condition,

{vL2_shD=vL2_non(1D)vL2_sh=Vc2(1D)nDvL1_shD=vL1_non(1D)vL1_sh=Vc2(1D)D(iv) (4)

Substitute (iv) in (i) we get,

{vL1sh=vL2shVc1Vc2(1D)D=Vc2(1D)nDVc1Vc1=Vc2(1D)(n1)nD(v) (5)

Across L3 apply voltage second condition,

{(Vin+Vc2)D=(vL2nonVin+Vc1)(1D)Vc2=Vin(nD)n(12D)1+D(vi) (6)

Substitute (vi) in (v) we get,

Vc1=Vin(1D)(n1)n(12D)1+D (7)

where, n denotes turns ratio, Vin denotes input voltage and D denotes duty cycle of shoot through mode in the improved ΓZSI.

Improved ΓZSI with clamping diode’s DC-link potential, vpn is find out from Eqs. (ii) and (iii), which is represented as,

{(Vin+Vc2)D=(vpnVinVc2)(1D)vpn=Vin(n1)(n(12D)1+D) (8)

Thus, the Boost factor B is represented as,

B=(n1)(n(12D)1+D) (9)

3.2 Modeling of 3Φ Induction Motor

The potential and torque equations, which characterize dynamic behavior at induction motor aid in explaining the differential equation at trouble-free way. In order to reduce difficulties in solving the equations, a change in variable is employed by neglecting time fluctuating inductances. The circuit diagram of induction motor is significantly highlighted in Fig. 6.

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Figure 6: Circuit diagram of an induction motor with improved ΓZSI with clamping diode

3.2.1 Induction Motor Model Generalized Idea in an Arbitrary Reference Frame

Even though real parameters remain sinusoidal, it is beneficial for obtaining device variables like dc quantities. These are accomplished through requiring the reference frame that is same as that of sinusoidal variable at the same angular speed. Instead of calculating every particular reference frame, this is beneficial to maintain common conversion of arbitrary reference frame.

3.2.2 Switching Over from 2Φ to 3Φ

If the uniformity among 3Φ and 2Φ machine is known, it is possible to obtain dynamic model of induction motor. The similarities depend on quantity of magneto motive force created in 2Φ as well as 3Φ windings with uniform current magnitudes. Consider every 3Φ winding as well as 2Φ windings that have 3Ns2numberofturns/phase . Under balanced condition, 3Φ induction motor equation is expressed as,

Va=2Vrmssin(ωt) (10)

Vb=2Vrmssin(ωt2π3) (11)

Vc=2Vrmssin(ωt+2π3) (12)

where, Va,VbandVc denote line voltages for phase a,bandc.

Interconnection between β and abc is expressed as,

[VαVβ]=23[1121203232][VaVbVc] (13)

In direct and Quadrature axes, the above equation is expressed as,

[VdVq]=[cosθsinθsinθcosθ][VαVβ] (14)

By using forthcoming transformation the prompt value of stator as well as rotor currents are computed and it is expressed as,

[iαiβ]=[cosθsinθsinθcosθ][idiq] (15)

[iaibic]=23[12321232][iαiβ] (16)

3.2.3 Computation of Flux Linkage

dΨqsdt=ωb[Vqs(ωeωb)Ψqs(RsXis)(ΨmqΨqs)] (17)

dΨdsdt=ωb[Vds(ωeωb)Ψqs(RsXis)(ΨmdΨds)] (18)

dΨqrdt=ωb[Vqr(ωeωrωb)Ψdr(RrXir)(ΨmqΨqr)] (19)

dΨdrdt=ωb[Vdr(ωeωrωb)Ψdr(RrXir)(ΨmdΨdr)] (20)

Ψmq=Xml[ΨqsXis+ΨqrXir] (21)

Ψmd=Xml[ΨdsXis+ΨdsXir] (22)

The currents are find by substituting the value of flux linkage,

iqs=1Xis(ΨqsΨmq)Xmi=1[1Xm+1Xis+1Xir] (23)

iqr=1Xir(ΨqrΨmq) (24)

ids=1Xis(ΨdsΨmd) (25)

idr=1Xir(ΨdrΨmd) (26)

Torque plus speed in rotor are expressed like,

Tc=(32)(P2)(1ωb)(ΨdsiqsΨqsids) (27)

ωb=(P2I)(TeTi) (28)

3.3 Modeling of PI Controller

The sum of proportion and integration coefficient is known as PI controller. The schematic representation of PI is depicted in Fig. 7.

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Figure 7: PI controller

At the same control error, proportion coefficient is greater and output power is low. To control proportional integral controller, position integration time is set to zero and proportion time is set to maximum. It attains periodic oscillation of device by gradually lowering the proportionality coefficient. The value received from proportionality coefficient is twice greater than optimal value of integration time. Problems faced by IM with PI controllers are increase in settling time and occurrence of maximum peak overshoot and also takes lot of time to stabilize the speed that aids the working of machine.

3.4 Modeling of Fractional Order PID Controller

On comparing with integer order controller, FOPID controller gives enhanced performance. The block’s schematic representation for FOPID controller is presented in Fig. 8.

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Figure 8: Fractional order PID controller

As a part of control system, it uses fractional order integration. By using fractional calculus, it improves and generalizes well established system and control strategies. Due to their additional degrees of freedom, the fractional order controller is selected. The controller order of fractional satisfies the criterions like sensitivity, specification, removing steady state error.

When comparing fractional order PID controller with conventional PI controller, it gives better performance with good dynamic response.

The generalization of non-integer order of fractional PID controller is expressed as,

u(t)=Kpe(t)+1TiDλe(t)+TdDμe(t) (29)

Here, the control signal is signified as u(t) , error is specified as e(t) , the order of integrator and differentiator are specified as λandμ .

3.5 Modeling of GWO-PI Controller

To tune proportional integral controller, the gray wolf optimizer is used. This novel population established algorithm is developed through aging. This technique imitates the social hierarchy as well as hunting performance of grey wolves. In GWO algorithm, four kinds of groups namely α,β,δandω are is defined for simulating leadership hierarchy. Searching for prey, encircling prey and attacking prey are three major steps of hunting. Flow chart for GWO algorithm is depicted in Fig. 9.

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Figure 9: Flow chart for GWO algorithm

A number of parameters are needed in this algorithm in order to be set are,

•   Initialize α,β,andδ .

•   Search the search agent’s amount.

•   Amount of iterations found is maximum.

•   Number of positions chosen as searching the neighborhood and the criteria for stopping.

One of the major steps for grey wolf hunting is given below,

•   Tracking, chasing as well as impending prey.

•   Pursuing, encircling as well as distressing prey till that ceases to move.

•   Violence against prey.

Almost appropriate solution is considered as alpha (α) , for modeling social hierarchy of wolves until designing gray wolf optimizer. Second as well as third finest solutions are therefore known as beta (β) , and delta (δ) . The remaining solution is considered as omega (ω) . The three wolves are followed by x wolves. Some mathematical equations are computed for modeling the encircling performance,

D=|C.Xp(t)X(t)| (30)

X(t+1)=Xp(t)+A.D (31)

where, t denotes current iteration, AandC denotes coefficient vectors, Xp specifies prey position vector yet X specifies grey wolf position vector. AandC Vectors expressed as,

A=2a.r1a (32)

C=2.r2 (33)

where, a components linearly decreases from 2to0 over course of iterations as well as r1,r2 are random vectors in [0,1].

So far, the first three finest solutions has been attained and update other search agents to change their locations according to location of finest hunt agents. Thus the given expressions projected is regarded as follows,

Dα=|C1.XαX|,Dβ=|C2.XβX|,Dδ=|C2.XδX| (34)

X1=Xα+A1.(Dα),X2=Xβ+A2.(Dβ),X3=Xδ+A3.(Dδ) (35)

Update current GW position is expressed as,

X(t+1)=X1+X2+X33 (36)

From this, we know that α,β,andδ evaluate position of prey.

4  Result and Discussion

4.1 Simulation Results

A source voltage waveform of improved ΓZSI is depicted in Fig. 10. Shape of waveform is sinusoidal in nature. To stabilize load currents, a 3Ф AC voltage waveform shifts 120o with respect to one another. It has the power to boost up input voltage in a wider range.

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Figure 10: Input voltage of improved ΓZSI waveform

An input potential of improved ΓZSI waveform is depicted in Fig. 11. An input potential of 175V is applied to the system. In an open loop response system, the variation of input potential is chosen as from 150to170V . The diode bridge rectifier converts this ac voltage into dc waveform which is then given to proposed converter.

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Figure 11: Input voltage of improved ΓZSI with clamping diode waveform

An output potential of improved ΓZSI waveform is depicted in Fig. 12. So this inverter boosts up the output voltage to 6 times with the amplitude of 600V . Form Fig. 12, it was revealed that even though the source voltage is varied, the output of ZSI does not show any change in magnitude which proves the dynamic stability nature of converter.

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Figure 12: Output voltage of improved ΓZSI with clamping diode waveform

An 3Φ inverter output potential waveform is depicted in Fig. 13. This graph clearly depicts three phase output AC voltage source inverter.

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Figure 13: 3Φ inverter output voltage waveform

Speed waveform of IM with proportional integral controller is depicted in Fig. 14. In this graph, we observe that speed attained through PI controller is 1246rpm which is clearly depicted in this graph. Three phases of inverter are represented by three different colors in the waveform. The Speed waveform of FOPID controller based IM is depicted in Fig. 15. In this graph, initially the speed is constant and then after a certain point it increases and then fluctuation occurs and after it goes to maximum value.

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Figure 14: Speed waveform of FOPID-IM

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Figure 15: Speed waveform of FOPID-IM

Waveform for Induction motor instant response through FOPID controller is depicted in Fig. 16. In the graph, initially there is an oscillation in speed and then after 1.5s , settling time goes to stable condition. The waveforms of speed and torque of FOPID controller based IM are depicted in Figs. 17 and 18. As of Fig. 17, it is observed that this FOPID controller attains a speed of 1300 rpm.

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Figure 16: Waveform of IM moment through FOPID

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Figure 17: IM speed waveform with fractional order PID controller

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Figure 18: IM torque of ILCCIM with FOPID controller

The waveform of IM speed using GWO-FOPID is depicted in Fig. 19. The waveform of IM torque using GWO-FOPID is depicted in Fig. 20.

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Figure 19: IM speed waveform with GWO-FOPID

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Figure 20: IM torque waveform with GWO-FOPID

4.2 Hardware Results

The proposed method contains 3 ϕ IM, FPGA controller, 3ϕ VSI and DSPIC30F2010 controller. In proposed method, by using electric motor the input power is applied via primary winding as well as current is induced in secondary winding. This origins rotor towards rotate through the fixed stator. An improved ΓZSI with a clamping diode that employed towards provide constant voltage and also it boost up the voltage.

FPGA controller is employed to operate motor at a constant speed and also 3 ϕ VSI is applied for the conversion of single phase to other phase. The prototype of hardware is depicted in Fig. 21.

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Figure 21: Hardware implementation

Input voltage of improved ΓZSI is depicted at Fig. 23. Output potential is boosted up and retains constant by means of improved ΓZSI. The input voltage is set to 100V . The inverter is able to get steady state current and operate at wide range of input voltages. On comparing input stress with conventional ZSI, improved ΓZSI with clamping diode have minimum input stress. Conversion of DC power to AC power with expected magnitude, frequency is carried out by thr proposed inverter topology. The input AC voltage is clearly represented in Fig. 22.

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Figure 22: Input 3ϕ AC voltage waveform

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Figure 23: Input voltage of improved ΓZSI

Output potential of the improved ΓZSI is depicted in Fig. 24. It has high modulation index in shoot-through mode in order to achieve voltage gain in improved ΓZSI. As ripples present in voltage are controlled, it also minimizes switching stress.

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Figure 24: Output voltage of improved ΓZSI

Output voltage of 3Ф VSI is depicted in Fig. 25. A 3Ф VSI is chosen because of high power. This inverter consists of 3 legs with 6 switches. It produces not only 3Ф potential on the other hand the power towards control magnitude, phase as well as frequency. It achieved both in 120o or 180o conduction mode. Output voltage that obtained through the switching modes from3Ф voltage source inverter.

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Figure 25: 3Ф VSI output voltage

The VSI output potential with filter is depicted Fig. 26. In order to generate stable AC voltage at output, VSI are commonly applied in continuous power supplies. The reference signals are compared with high frequency carrier waveform in order to obtain control pulses for AC output. The output potential is directly affected due to any changes in output load.

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Figure 26: VSI output voltage with filter

Speed waveform with PI, FOPID and GWO-PI is illustrated in Fig. 27. Unlike PI and FOPID, the GWO-FOPDI provides good performance. The PI controller has the ability to reduce steady state error, but this controller response slowly to instant distortion, needs lot of time to settle and oscillations in speed. To overcome these issues, FOPID controller is employed and it succeeds all issues faced by PI controller. FOPID controller maintains stable speed in a robust manner and gives more adjustable time and frequency responses but fails to overcome maximum peak overshoot problem. In order to reduce this problem, GWO is employed to tune the PI controller. From the above speed waveform of PI, FOPID and GWO-FOPID, it is depicted that GWO-FOPDI gives excellent response then provides higher efficiency in stable state and also reduces the settling time.

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Figure 27: (a) Speed waveform with proportional integral, (b) Speed waveform with FOPID controller, (c) Speed waveform with GWO-FOPID

After analysis of time domain, peak signal amplitude needed by motor is reduced from 1.25to0.45 and the peak region is decreased from 1.37to0.51 and time needed toreply are decreased as 1.51to0.75 then steady state error reduces from 1.6to0.7 .

The torque variable with PI controller, FOPID and GWO-FOPID are listed out in Tab. 1. Time needed from signal is reduced from 1.33to0.42 , peak region decreased from 1.44to0.57, time needed for response reduced from 1.71to0.63 as well as steady state error that reduced as 1.2to0.8 .

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Motor speed efficiency comparison of PI, FOPID and GWO-FOPID is depicted in Fig. 28. From this comparison, GWO-FOPID depicts higher efficiency.

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Figure 28: Comparative analysis of (a) speed and (b) torque

The performance of the GWO-PI controller in terms of raise time, peak time, settling time and steady state error is analogized with other existing controllers as highlighted in Tab. 1. The result of this analysis validates that the proposed control approach delivers optimal performance than the others.

5  Conclusion

An improved ΓZSI with a clamping diode is proposed in this work. To operate the induction motor at rated speed, different controllers are used to control the voltage source inverter. With conventional PI controller, settling time increases and maximum peak overshoot occurs. Additionally, fractional order PID controller and GWO technique that employed in enhancing its enactment of speed control of IM. Fractional order PID control is employed to enhance the performance of PI controller and also provide good speed response as well as steady state error. Moreover, Gray wolf optimization technique is used to optimize maximum peak overshoot problems in PI controller. In accordance with the comparative analysis of motor performance under optimal torque and speed values, it is validated that the speed response of rise time, settling time and peak time have been improved upto 50%, 44% and 36%. The improvement in reduction of steady state speed error and torque error are 40% and 20%. The whole performance is executed in MATLAB simulation.

Funding Statement: The authors received no specific funding for this study.

Conflicts of Interest: The authors declare that they have no conflicts of interest to report regarding the present study.

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Cite This Article

APA Style
Singh, D.B.R., Malar, R.S.M. (2023). Improved clamped diode based z-source network for three phase induction motor. Intelligent Automation & Soft Computing, 36(1), 683-702. https://doi.org/10.32604/iasc.2023.028492
Vancouver Style
Singh DBR, Malar RSM. Improved clamped diode based z-source network for three phase induction motor. Intell Automat Soft Comput . 2023;36(1):683-702 https://doi.org/10.32604/iasc.2023.028492
IEEE Style
D.B.R. Singh and R.S.M. Malar, “Improved Clamped Diode Based Z-Source Network for Three Phase Induction Motor,” Intell. Automat. Soft Comput. , vol. 36, no. 1, pp. 683-702, 2023. https://doi.org/10.32604/iasc.2023.028492


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This work is licensed under a Creative Commons Attribution 4.0 International License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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