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Article
Control Strategy for Three-Phase PWM Boost Rectifier Operating Under Different SupplyVoltage Conditions

Authors: Turki Kahawish Hassan --- Muntadher Kadhem Abdullah
Journal: Iraqi Journal for Electrical And Electronic Engineering المجلة العراقية للهندسة الكهربائية والالكترونية ISSN: 18145892 Year: 2015 Volume: 11 Issue: 1 Pages: 83-100
Publisher: Basrah University جامعة البصرة

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Abstract

In this paper, a proposed control strategy is presented to improve the performance of thepulse width modulation (PWM) boost type rectifier when operating under different supply voltageconditions (balanced, unbalanced, and distorted three-phase supply voltages). The proposed controlstrategy is divided into two parts, the first part is voltage controller and the second part is currentcontroller. In the voltage controller, Repetitive Controller (RC) is used to reduce the even orderharmonics in the regulated output dc voltage so small output capacitor (filter) is used instead of largecapacitor. RC also reduces the even order harmonics which appear in the reflected dc current (IMAX),this leads to reduce the odd order harmonics which appear in the input currents. While in the currentcontroller, Enhanced Phase Locked Loop (EPLL) technique is used to obtain sinusoidal and balancedthree phases, to construct the reference currents, which are in phase with the fundamental supplyvoltages. Therefore, the supply-side power factor is kept close to unity. A proportional controller isused to give excellent tracking between the line and the reference currents. The complete system withthe proposed control strategy are simulated using Matlab/Simulink. The results for the completesystem using repetitive voltage controller are obtained and compared to the results of the system withthe conventional voltage controller (Proportional-Integral (PI) controller connected in series with aLow Pass Filter (LPF)). The results with the repetitive controller show better response and stableoperation in the steady state under different input voltage conditions, as well as in the transientresponse under changing the load condition.


Article
THREE-PHASE PWM BOOST RECTIFIER OPERATING UNDER DIFFERENT INPUT VOLTAGE CONDITIONS
المقوم ثلاثي الاطوارالمضمن بعرض النبضة نوع رافع للجهد والذي يعمل تحت مصدر تغذية متغير الحالات

Authors: Turki Khawish Hassan --- Muntadher Kadhem Abdullah
Journal: Journal of Engineering and Sustainable Development مجلة الهندسة والتنمية المستدامة ISSN: 25200917 Year: 2015 Volume: 19 Issue: 6 Pages: 97-117
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

In this paper, a proposed control strategy is presented to improve the performance of the pulse width modulation (PWM) boost rectifier when operating under different supply voltage conditions (balanced, unbalanced, and distorted three-phase supply voltages). The proposed control strategy is divided into two parts, the first part is voltage controller and the second part is current controller. In the voltage controller, Proportional-Integral (PI) controller is used to regulate the output dc voltage at any desired level and Low Pass Filter (LPF) to reduce the even order harmonics which appear in the regulated output dc voltage due to unbalanced input supply voltages. LPF also reduces the even order harmonics which appear in the reflected dc current (IMAX), this leads to reduce the odd order harmonics which appear in the input currents. While in the current controller, Enhanced Phase Locked Loop (EPLL) technique is used to obtain sinusoidal and balanced three phases, to construct the reference currents, which are in phase with the fundamental supply voltages Therefore, the supply-side power factor is kept close to unity. A proportional controller is used to give excellent tracking between the line and the reference currents. The complete system with the proposed control strategy is simulated using Matlab/Simulink (Version 2012). The results for the complete system using proposed voltage controller are obtained and compared to the results of the system with the conventional voltage controller (proportional-integral (PI) is used without LPF). THDs for three-phase input line currents are better when using the proposed voltage controller (less than 5%).

هذا البحث يقدم استراتيجية سيطرة لتحسين اداء مغير القدرة المضمن بعرض النبضة رافع للجهد تحت تأثير عدة عوامل بالجهد الداخل)العوامل هي اتزان, عدم اتزان و تشويه بالجهد الداخل(. هذه الاستراتيجية يمكن تقسيمها الى قسمين هما: القسم الاول هو مسيطر للجهد بينما القسمالثاني هو مسيطر للتيار. في القسم الاول, مسيطر نسبي وتكاملي لتنظيم الجهد الخارج المستمر عند اي قيمة مع استخدام مرشح مرور التردداتالواطئة لتقليل التوافقيات الزوجية التي تظهر في الجهد الخارج المستمر بسبب عدم الاتزان في الجهد الداخل. مرشح مرور الترددات ايضا يقومبتقليل التوافقيات الزوجية التي تظهر في التيار المستمر المنعكس ) (IMAX وهذا يؤدي الى تقليل التوافقيات الفردية التي تظهر في التيارات الداخلة.بينما في القسم الاخر من هذه الاستراتيجية هو مسيطر التيار الذي يستخدم تقنية معزز دائرة قفل الطور (EPLL) للحصول على موجات ثلاثيةالطور جيبيه ومتزنة لبناء التيارات الاساسية التي تكون متطابقة بالطور مع المركبة الاساسية للجهد الداخل لتحسين عامل القدرة. مسيطر نسبييستخدم في مسيطر التيار لتحسين التتبع بين التيارات الاساسية والتيارات الداخلة.النظام مع هذه الاستراتيجية تنفذ باستخدام البرنامج الحاسوبي MATLAB/SIMULINK )اصدار 2012 (. نتائج النظرية باستخدام المسيطرالنسبي والتكامل مع مرشح مرور الترددات )الطريقة المقترحة( تقارن مع النتائج النظرية باستخدام المسيطر النسبي والتكاملي )الطريقة التقليدية(.تشويه التوافقيات الكلي (THD) للتيارات الداخلة تكون افضل باستخدام الطريقة المقترحة )تكون اقل من 0,05).

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