UNIVERSITAS BHAYANGKARA SURABAT'A (LPPM)

YAYASAN BRATA BHAKTI JAWA-TIMUR

UNIVERSITAS BHAYANGKARA SURABAT'A

LEUBAGA PENELITIAN DAI{ PENGABDIAN XEPADA MASYARAKAT

(LPPM)

Jllan Ahm.d Yani

tla

Sur.b.y., Tclp. 031{2E5602, tarl055, Fu.03l{285601

SURAT KETERANGAN

Nomor

:

skev

dlttzoz3/LPPM/uBHARA

Yang bertanda tangan dibawah ini ^:

Nama ^:

Drs. Heru lrianto, M.Si

NIP :

9000028

NIDN :

0714056102

Jabatan :

Kepala Lembaga Penelitian dan Pengabdian Kepada Masyarakat (LPPM) Universitas bhayangkara Surabaya

Dengan ini menerangkan bahwa dosen prodi Teknik elektro Universitas Bhayangkara Surabaya atas nama Dr. lr. Saidah, MT benar telah melakukan kegiatan ^:

1.

Menulis artikel yang

telah di

^publish

di jurnal Journal of Theor€tical and Applied lnformation Technology

Volume

40, Nomor 2

berjudul

Advance Control of Active Rectifier using Switch Function and Fuzry Logic for ^{Nonlinear Behaviour}

Compensation,

sebagai ketua

dan

koresponden pada Juni

2012,

ISSN

:

'18'17-3195,

terindeks

SCOPUS Q4

2. Telah

melakukan korespondensi melalui

email dan OJS dalam proses

review dan penerbitan

jurnal tersebut. Bukti

korespondensi email

dan bukti

^pendukung adalah benar sudah dilakukan oleh yang bersangkutan serta sudah dilampirkan bersama surat ini.

Demikian surat keterangan ini dibuat untuk dapat dipergunakan sebagaimana mestinya

3l

Januai 2023 PM

lrianto, M.Si

RECEIPT OF NEW MANUSCRIPT

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Tanggal: Kamis, 29 Maret 2012 23.07 WIB

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LETTER OF ACCEPTANCE

1/10/23, 10:13 AM Yahoo Mail - [JATIT] Letter of Acceptance for Submitted Research Paper ID 15190-JATIT

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[JATIT] Letter of Acceptance for Submitted Research Paper ID 15190-JATIT

From: Journal of Theoretical and Applied Information Technology (editorjatit@gmail.com) To: sdhbaisa61@yahoo.com

Date: Thursday, May 10, 2012 at 01:56 PM GMT+7

Dear Corresponding Author Saidah

We are pleased to inform you that your paper titled ADVANCED CONTROL OF ACTIVE RECTIFIER USING SWITCH FUNCTION AND FUZZY LOGIC FOR NONLINEAR BEHAVIOUR COMPENSATION paper ID: 15190 - JATIT having author(s): SAIDAH, M. HERY PURNOMO, M. ASHARI has been conditionally accepted for publication in the Peer Reviewed and Indexed [SCOPUS, EBSCO, DOAJ, ULRICH, , DBLP, Google Scholar, ITRC, NLM Cat, CREAA, IISJ, TOC, CSJ, CASC, Microsoft Academic Search,Cabell Publishing, INSPEC,OpenJgate, IAOR (Palgrave

Macmillan) etc] International Journal of Theoretical and Applied Information Technology (E-ISSN 1817-3195 / ISSN 1992-8645). The acceptance decision was based on the internal and external reviewers' evaluation after internal and external double blind peer review and chief editor's approval.[Reference to evaluation report for paper and make updates in camera ready copy accordingly] .

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Title of Manuscript: Advance Control of Active Rectifier using Switch Function and Fuzzy Logic for Nonlinear Behaviour Compensation

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PAPER JATIT

Journal of Theoretical and Applied Information Technology 30^th June 2012. Vol. 40 No.2

© 2005 - 2012 JATIT & LLS. All rights reserved.

ISSN: 1992-8645 www.jatit.org E-ISSN: 1817-3195

156

ADVANCED CONTROL OF ACTIVE RECTIFIER USING SWITCH FUNCTION AND FUZZY LOGIC FOR NONLINEAR

BEHAVIOUR COMPENSATION

1,2SAIDAH, ¹M. HERY PURNOMO, ¹M. ASHARI

1Department of Electrical Engineering

Sepuluh Nopember Institute of Technology (ITS), Surabaya-Indonesia

2Department of Electrical Engineering Bhayangkara University, Surabaya-Indonesia

E-mail: ¹sdhbaisa61@yahoo.com

,

²hery@ee.its.ac.id

,

³ashari@ee.its.ac.id

ABSTRACT

Power Semiconductor switches of active rectifier are characterized by highly nonlinear property, resulting in high harmonic distortion and high ripple voltage on the DC side. This paper presents advanced control using switch function and fuzzy logic for compensating nonlinear behaviour. The system applies switch function of time as the input of control strategy, instead of current and voltage in d-q frame. The fuzzy logic controller aims to minimize DC voltage deviation by regulating the line current amplitude. This system uses minimum number of sensors, which is the voltage only to avoid the effect of sensor nonlinearity to the system. This performance is demonstrated and compared with PI-optimized controller.

Simulations result have been conducted for variation values of capacitance, inductance and loads. The results show that the harmonic distortion and the ripple voltage on the DC side are 0.036 % compared PI- optimized controller as 5.64 %.

Keywords: Fuzzy Logic Controller, PI-optimized, Harmonic Distrotion, Optimized Controller

1. INTRODUCTION

Active Rectifier is widely used in industrial applications because it has many advantages including unity power factor, low ripple of the DC- voltage and low total harmonics distortion. Due to these features, the active rectifier is a good choice for application in industrial drives [1-2].

At first, PID controllers were considered as simple and robust techniques [6, 9-10]. However, one of the drawbacks in using PID control techniques was that they were not sufficient to obtain the desired tracking control performance because of the nonlinearity of the rectifier. Then, the method known as fuzzy logic control was introduced. This method is able to overcome the nonlinear systems. There are publications presenting the miscellaneous results of the Fuzzy Logic in application to the control systems of the switched-mode rectifier. The first design of the fuzzy Logic control system was created to overcome nonlinear impedance on the DC side, particularly when the characteristics of the DC side

generation/load are unknown [12]. Later, the system with two fuzzy logics is used to control the current feedforward and modulation, then, it is analyzed to look for high performance even by using small passive elements and low swicthing frequency [13]. Other publication uses Fuzzy Logic controller to optimize the capacitor charge /discharge process in a PWM rectifier. This results in a regulated output voltage and power factor, even during various kinds of perturbations [14].

This paper proposed the fuzzy logic controller to overcome the nonlinearity of three-phase active rectifier. The principle of this Fuzzy Logic was to minimize the voltage deviation from its reference and to regulate variation of line current amplitude.

To control current amplitude, this system did not use any current sensor. This is to avoid the effect of sensor nonlinearity to the system. Hence, a fully regulated DC voltage was obtained with a low harmonic distortion of the line current. Then the control of the switching pattern and their duty cycle space vector modulation (SVM) with switch function as input was used.

Journal of Theoretical and Applied Information Technology 30^th June 2012. Vol. 40 No.2

© 2005 - 2012 JATIT & LLS. All rights reserved.

ISSN: 1992-8645 www.jatit.org E-ISSN: 1817-3195

157 2. PROPOSED CONTROL STRATEGY

In general, control strategy for switching patterns and their duty cycles on the rectifier uses voltage or current. This system proposed the use of switching function in d–q frame (s_d , s_q) obtained from the calculation from the model transformation.

Switching function in d–q frame was converted into α β frame (sα , sβ) and then it was used as the input of SVM (Space Vector Modulation) to get gate signals, as shown in Fig. 1. The proposed system also developed a fuzzy logic to control the amplitude of the line current based on the deviation of the DC voltage

β α q β d

α abc

β α

cosωt sinωt

Z / 1 V0

ia

ib

ic

AC 3φ

eb ea

α

e eβ

Sq Sd

Sβ

Sα

Fig. 1. Block diagram of the proposed control strategy

3. THE MODELLING AND DESIGN OF THE THREE-PHASE ACTIVE RECTIFIER

3.1 Mathematical Model

Figure 2. represents the topology of the three- phase active rectifier proposed. The dynamic model of rectifier consists of a three-phase network connected to three-phase supply voltage ea , eb , ec

by assuming a balanced three-phase system, the three-phase input line currents i_a, i_b, i_c and v_a, v_b, v_c which represent the three-phase voltages generated by the PWM active rectifier. R and L are the resistance and inductance of the line, a smoothing capasitor, and the load represented by a current source.

The mathematical model of the three-phase system written in space vectors was as follows[15]:

x(t) = 2/3 [x_a(t) + a x_b(t) + a² x_c(t)] (1)

Figure 2. Three-Phase Active Rectifier System

Where a=e^j2π/3 and x_a (t) , x_b(t) dan x_c (t) were the components of the three-phase system.

Then the mathematical model of the active rectifier was analized using space vector:

v(t) = e(t) - Ri(t) – L di(t)/dt v(t) = ½ s(t)v_o(t)

i_o(t) = (3/4) Re{s(t)i⁺(t)}

i_c(t) = C dv_o/dt = i_o(t) - i_L(t) (2) Where

v(t) =

rectifier input voltages

i(t) =

rectifier input currents i⁺(t) = complex conjugate of i(t) e(t) = the input line voltages i_o(t) = rectifier output current i_c(t) = capacitor current i_L(t) = load current s(t) = switching function v_o(t) = output voltage

The matematical model written in state space form was

dv_o(t)/dt = 1/C {3/4 Re{s(t)i⁺(t)} - i_L(t)} (3) di(t)/dt = 1/L [-Ri(t) + e(t) - ½ s(t)v_o(t)] (4) When the drop voltage across R was negleted, the equation (4) was

di(t)/dt = 1/L [e(t) – ½ s(t)v_o(t)] (5) The equation in (3),(5) showed that the system was nonlinear second order and its behaviour depended on the vector s(t).

From (5), switching function s(t) could be obtained as

S(t) = 2/v_o(t) [e(t) – L di(t)/dt] (6)

3.2 Design Current Controller For The Three- Phase Rectifier

The controller design of the line current had two purposes: the first was to obtain line current with low harmonic distortion and unity power factor; the second was to obtain controlled the dc voltage.

Thus, the system overall performance of the system depended on the design of the current control.

Journal of Theoretical and Applied Information Technology 30^th June 2012. Vol. 40 No.2

© 2005 - 2012 JATIT & LLS. All rights reserved.

ISSN: 1992-8645 www.jatit.org E-ISSN: 1817-3195

158 3.2.1 Current Sensorless

The sensor had an important role in determining overall system performance because dynamic and static characteristics of the sensor gave the true value of the output variable that would be measured. So, using minimum number of sensors will reduce the effect of noise and complexity of the system. This system eliminated the use of two pieces of current sensor so-called current sensorless. The system used three of the voltage sensors (two AC voltage and one of DC voltage sensors).

The system sensorless work based on the Transformation Model, as shown in Fig. 1.

Equation 10 – 15 shows steps to obtain the switch function s_d and s_q in discrete model

e

_n

= E

_m

exp(jωt

n

) i

n

= I

m,n

exp(jωt

n

)

s_n = S_m,n exp[j(ωt_n + ϕn)] (10) Where tn = nTs and tn-1 = (n-1)Ts were the discrete- time variables and T_s was the sampling period.

The switching vector s_n was obtained from calculating variation of the current amplitudo,

∆ I

_m,n was ouput of Fuzzy Logic Controller.

Equation (6) was written in discrete as

(11) From (11) switching vector in d-q frame rotating at angular speed was obtained

(12) (13)

Where and

, equation (12) and (13) become

(14) (15) Equation (14) and (15) are the final formula for s_d and s_q, which are used in Transformation Model block in Fig. 1. It was clear that vector switching s_d dan s_q only depended on

∆ I

_m,n^, and current reference was not needed [13].

3.2.2 Fuzzy Logic Controller Design

Fuzzy Logic Controller approach offers the possibility to model a nonlinear system on the basis of the knowledge of many not-well defined relations among the systems and to design a controller that adapts itself to several working conditions.

A Fuzzy Logic Controller is based on a collection of control rules governed by the compositional rule of inference. A fuzzy system realises a nonlinear correspondence between a vectorial input and a scalar output [7]-[8].

In this system, fuzzy logic controller was aimed to minimize the error (e) by regulating the amplitude of ∆Im,n. The Input of fuzzy Logic Controller includes voltage variation from the reference (e) and the deviation (∆e), while the output was the variation of the current amplitude

∆I_m,n. The membership functions for input and output variables are reported in Fig. 3, Fig. 4 and Fig. 5.

Fig. 3. The membership function of output voltage variation

Fig. 4. The membership function of output voltage variation

Journal of Theoretical and Applied Information Technology 30^th June 2012. Vol. 40 No.2

© 2005 - 2012 JATIT & LLS. All rights reserved.

ISSN: 1992-8645 www.jatit.org E-ISSN: 1817-3195

159 Fig. 5. The membership function of variation

current amplitude 3.3 Space Vectors of Modulation

The component d and q of the switching vector (13) were transformed into the α and β components of stationary frame and they were used as inputs for space vector modulation (SVM). Space vector algorithm can be depicted in the flowchart as shown in Fig. 6. This algorithm describes the process to obtain the control signal switches of the three-phase rectifier through a switch reference vectors.

β αdan S S reference the of components vector the Detemine

Fig 6. Algorithm of Space Vector Modulation 3.4 PI Optimized

The design of PI Optimized was aimed to tune the gains of the PI controller (Kp and Ki) and to optimize the response of the plant. The following are steps for PI optimized,

1. apply constraint block placed at actuator signal and output signal. The constraint block showed the plant response for each iteration of the optimizated process and the black curve represented the optimized response.

2. Run the simulation producing an unoptimized response and the initial data for optimization.

3. Perform the scope block to view the unoptimized response.

4. The output of constraint block to view constraints on the plant response, including rise time, settling time and maximum overshoot.

5. In the block parameters window, click the start optimization button to begin optimization. The model also included the actuator constraint block, but you could start optimization from any constraint block. The actuator constraint block defined the contraints on the actuation signal of the controller.

The result simulation by using PI-optimized showed that proportional constant (Kp) was 3.18 and integral constant (Ki) was 5.024.

4. RESULT AND DISCUSSION

The proposed controller was evaluated through several simulations. This section present the most relevan results. The controller performance was tested through simulations on a system which data were: nominal load power S_N = 7 kW, parameters E_m = √2 . 220volt, Vdc = 650 volt, ω = 2π x 50 rad/s , R = 0.3 Ω , L = 8 mH, C =1000 µF.

Simulation results using the fuzzy logic controller were compared to simulation using a PI optimized. The purpose of this comparison was to obtain good performance of the rectifier system due to nonlinear effects.

Fig.7. Presents the DC-link voltage with PI Optimized and fuzzy logic. The fuzzy controller reduced dc-link voltage ripple 0.036 % with respect to PI optimized control methode with ripple 5.64 %. Fig.8. Demonstrates the line phase voltage and current. The simulation results showed that THD = 3.956 % and Power factor = 0.9921.

.Fig.7. (a). Presents the DC-link voltage with PI Optimized

Journal of Theoretical and Applied Information Technology 30^th June 2012. Vol. 40 No.2

© 2005 - 2012 JATIT & LLS. All rights reserved.

ISSN: 1992-8645 www.jatit.org E-ISSN: 1817-3195

160 Fig. 7(b) with fuzzy logic

Fig.8. demonstrates the grid phase voltage and line phasa current

Fig. 9a demonstrates the three-phase line current under the step change of the rectifier load and Fig.

9b present the rapid transient of the DC link voltage.

Fig. 9

(a)

Fig. 9

(b)

Fig. 9. (a) three phase line current and (b) the rapid transient of the DC-link voltage

In this simulation, we observed the rectifier’s behavior by varying the values of the inductor and the capacitor. Fig. 10 demonstrates the robustness of DC voltage of the rectifier using Fuzzy controller under various values of capacitance and inductance. The system performance was not much affected by the change.

Fig. 10 (a)

Fig. 10 (b)

Fig. 10. (a). Demontrates the robustness DC voltage of the rectifier’s Fuzzy control system to the DC link capacitance changes and (b).

inductance canges

.

5. CONCLUSION

This paper presented advanced control of active rectifier using switch function and fuzzy logic for nonlinear behaviour compensation. Two different controller structure, fuzzy logic and PI optimized controllers, were also presented to compare the system performances. Simulation results showed that the fuzzy controller had better characteristics compared to PI-optimized control methods, in dealing with the nonlinearity behaviour

.

Journal of Theoretical and Applied Information Technology 30^th June 2012. Vol. 40 No.2

© 2005 - 2012 JATIT & LLS. All rights reserved.

ISSN: 1992-8645 www.jatit.org E-ISSN: 1817-3195

161 REFERENCES:

[1] Hong-Seok Song, In-Won Joo, and Kwanghee Nam, “Source Voltage Sensorless Estimation Scheme for PWM Rectifiers Under Unbalanced Conditions”, IEEE Transactions On Industrial Electronics, VOL. 50, NO. 6, December 2003.

[2] Ashari, M., W.W.L. Keerthipala and C.V.

Nayar, “A Single Phase Parallely Connected Uninterruptible Power Supply/ Demand Side Management System”, IEEE Transactions on Energy Conversion, vol. 15, No. 1, March 2000, pp.97-102.

[3] Carlos Gaviria, Enric Fossas, and Robert Griñó, “Robust Controller for a Full-Bridge Rectifier Using the IDA Approach and GSSA Modeling”, IEEE Transactions On Circuits And Systems—I: Regular Papers, Vol. 52, No.

3, March 2005

[4] N.Albert Singh, M.Marsaline Beno, "An Intelligent controller for a non-linear Power Electronic Boost converter", IEE Proc.of Int.

Conf. on Energy, Information Techmology and Power Sector,Kolkata, pp.232-235, 2005.

[5] Joseph Jawhar. S, Dr. N.S. Marimuthu, Albert Singh. N, ”An Neuro-Fuzzy Controller for a Non Linear Power Electronic Boost Converter”, 2006 IEEE

[6] R. S. Pens, R. J. Cardenas, J.C.Clare, G.M.Asher, “Control Strategies for Voltage Control of a Boost Type PWM Converter” , 2001 IEEE.

[7] Y. Murai, T. Watanabe, and H. Iwasaki,

“Waveform distortion and correction circuit for PWM inverters with switching lag-times,”

IEEE Trans. Ind. Appl., vol. IA-23, no. 5, pp.

881–886, Sep./Oct. 1987.

[8] Dong-Choon Lee, and Dae-Sik Lim, “AC Voltage and Current Sensorless Control of Three-Phase PWM Rectifiers”, IEEE Transactions On Power Electronics, Vol. 17, NO. 6, November 2002

[9] Marian P. Kazmierkowski, and Luigi Malesani, “Current Control Techniques for Three-Phase Voltage-Source PWM Converters: A Survey”, IEEE Transactions On Industrial Electronics, Vol. 45, No. 5, October 1998

[10] Ahmed Z. Alassar, Iyad M. Abuhadrous, Hatem A. Elaydi, “Comparison between FLC and PID Controller for 5DOF Robot Arm”, 2010 IEEE.

[11] Masoud Hajihashemi, Ali Nazeran Motlagh,

“Improved 3-phase PWM Boost Rectifiers in Unbalanced Network by Fuzzy Controller”, The International Conference on Electrical Engineering 2009.

[12] R. S. Pens, R. J. Cardenas, J.C.Clare, G.M.Asher, “Control Strategies for Voltage Control of a Boost Type PWM Converter”, 2001 IEEE.

[13] Carlo Cecati , Antonio Dell’Aquila, Marco Liserre, and Antonio Ometto,” A Fuzzy- Logic-Based Controller for Active Rectifier”, IEEE Transactions On Industry Applications, Vol. 39, No. 1, January /February 2003.

[14] Antonio Dell’ Aquila, M. Liserre, C. Cecati, and A. Ometto A, “ Fuzzy Logic CC-PWM Three-phase AC-DC Converter”, 2000 IEEE.

[15] Matti Jussila, Mika Salo, Lauri Kähkönen, and Heikki Tuusa, “Vector Modulated Three- Phase Four-Quadrant Rectifier” – Application to a DC Motor Drive”, The authors are with the Institute of Power Electronics, Department of Electrical Engineering, Tampere University of Technology.

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Dari: Journal of Theoretical and Applied Information Technology <editorjatit@gmail.com>

Kepada: sdhbaisa61@yahoo.com Dikirim: Kamis, 10 Mei 2012 13:56

Judul: [JATIT] Letter of Acceptance for Submitted Research Paper ID 15190-JATIT

Dear Corresponding Author

Saidah

We are pleased to inform you that your paper titled

ADVANCED CONTROL OF ACTIVE RECTIFIER USING SWITCH FUNCTION AND FUZZY LOGIC FOR NONLINEAR BEHAVIOUR

COMPENSATION

paper ID: 15190 - JATIT having author(s):

SAIDAH,

M. HERY PURNOMO, M.

ASHARI h

as been conditionally accepted for publication in the Peer Reviewed and Indexed [SCOPUS, EBSCO, DOAJ, ULRICH, , DBLP, Google Scholar, ITRC, NLM Cat, CREAA, IISJ, TOC, CSJ, CASC, Microsoft Academic Search,Cabell Publishing, INSPEC,OpenJgate, IAOR (Palgrave Macmillan) etc] International Journal of Theoretical and Applied Information Technology (E-ISSN 1817-3195 / ISSN 1992-8645). The acceptance decision was based on the internal and external reviewers' evaluation after internal and external double blind peer review and chief editor's approval.

[Reference to evaluation report for paper and make updates in camera ready copy accordingly] .

You have to proceed with submission of publication/ paper registration fee ($185) via credit card transaction through our online payment system. Please submit the dues on our US based submission system at

http://store.kagi.com/?6FDZK_LIVE&lang=en

so that your paper may get published in next months issue. (Please provide us with the receipt number generated after the completed payment process so that we can easily track your payment). The billing info will appear on your cc statement as kagi.inc, breckley California USA.

You can submit the publication/ registration fee via wire transfer directly to the following bank account (US $185 publication dues +$10 bank charges)

>> Bank Account Title: Journal of Theoretical and Applied Information Technology Islamabad PAKISTAN

>> Bank Account No: 01145786901

>> Bank Name: Standard Chartered Bank I-8 Markaz Branch, Islamabad PAKISTAN.

>> Swift Code: SCBLPKKX

>> JATIT Address: Flat No. 5 Block No. 17 CAT-III Sector I-8/1, Islamabad, PAKISTAN.

Forward the receipt id after making the payments so that the transaction be traced. You may also contact me otherwise if you want to opt for payments from western-union or moneygram etc. You will receive a copy of JATIT volume with accepted article after publication.

Kindly submit a camera ready copy with updates as per evaluation in MS word document and journal (two column) format [attached with this acceptance letter] to address publisher@jatit.org "Mr. Shahzad" after registration fee submission and necessary updates.

Kindly proceed with registration fee submission for limited open slots allocation in the upcoming July 2012 Vol 41 Issues of JATIT. Delayed registration fee payments would result in publication slot allocation in next month's issues of JATIT as volumes have limited number of slots allocated on first pay basis and are allocated one month ahead of publication.

We congratulate you on acceptance of paper and shall encourage more quality submissions from you and your colleagues in future.

Regards,

Shahbaz Ghayyur Co-Editor in Chief Editorial Office

Journal of Theoretical and Applied Information Technology

editor@jatit.org / editorjatit@gmail.com

1/10/23, 11:34 AM Yahoo Mail - website untuk pembayaran online

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Publishing House Little Lion Scientific

*/ JATIT is widely distributed in print and electronic from and is also indexed with major indexing agencies making its visibility and citation potential higher than its competitors. JATIT it is now officially recommended by a number of universities and scientific institutions worldwide for publication of research which is the source of its high submission rate and high SJR and SNIP values. We are also trying to further improve its flow and visibility by a number of collaborative efforts. JATIT has now been accepted for indexing in Cabell Publishing and INSPEC. Latest indexing information is available at the indexing and abstracting page at www.jatit.org. */

PERMINTAAN HARDCOPY JURNAL

Re:

Dari: editor jatit (mailjatit@gmail.com) Kepada: sdhbaisa61@yahoo.com Tanggal: Selasa, 9 Oktober 2012 13.48 WIB

Dear Author

Your copy was returned undelivered as it was wrongly forwarded to Malaysia (our dispatch section mistake for printing the address wrongly) and the dispatch section has informed that they have re forwarded the copy to the following address about 3-5 days ago. You shall be in receipt shortly.

SAIDAH

JALAN RUNGKUT MENANGGAL HARAPAN A-33 SURABAYA-JAWA TIMUR

INDONESIA-60293 Regards

Editorial Office JATIT

On Tue, Oct 9, 2012 at 9:51 AM, saidah baisa <sdhbaisa61@yahoo.com> wrote:

Dear Editor Jatit

My paper have published in 30th June 2012. Vol. 40 No.2 in title "ADVANCED CONTROL OF ACTIVE RECTIFIER USING SWITCH FUNCTION AND FUZZY LOGIC FOR NONLINEAR BEHAVIOUR COMPENSATION" with paper id is 15190-jatit. Until now I have not get journal hard copy yet. I have frequently sent email to ask my published journal hard copy, but I didn't get answer . Would you please help me to get this published hard copy, because I really need it. If jatit have sent it, where is the shipping/registration address and shipment registration number, so that I can track it. I have recommended my friends to sent their paper to jatit journal. Thank for your attention.

Best regard Author Saidah

Dari: editor jatit <mailjatit@gmail.com>

Kepada: saidah baisa <sdhbaisa61@yahoo.com>

Dikirim: Selasa, 18 September 2012 15:21 Judul: Re:

Dear Author

The journal free hard copy is included in the fee of publication. We shall see what is the issue in your case and why did you not get a copy of the journal yet.

You are requested to confirm your full postal address.

Regards Editorial Office JATIT

On Tue, Sep 18, 2012 at 12:20 PM, saidah baisa <sdhbaisa61@yahoo.com> wrote:

Dear Shahbaz Ghayyur Co-Editor in Chief

My paper have published in 30th June 2012. Vol. 40 No.2 in title "ADVANCED CONTROL OF ACTIVE RECTIFIER USING SWITCH FUNCTION AND FUZZY LOGIC FOR NONLINEAR BEHAVIOUR COMPENSATION" with paper id is 15190-jatit. How can I get published journal hard copy ? Do I have to pay if I want to get it or published journal hard copy is already included in the payment of 185 dollars?, because until now I have not get journal hard copy yet. Thankyou for your attention.

Best regard saidah

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