An Enhanced IUPQC Controller to Provide Grid Voltage Regulation

This paper shows an enhanced controller for the double topology of the brought unified power quality conditioner (iUPQC) developing its materialness in power-quality remuneration, and additionally in smaller scale network applications. By utilizing this controller, past the traditional UPQC control quality components, including voltage list/swell remuneration, the iUPQC will likewise give responsive power support to manage the load-bus voltage as well as the voltage at the matrix side bus.A FUZZY controller is executed in this venture in the place of PI controller. IUPQC will fill in as a static synchronous compensator (STATCOM) at the network side, while giving likewise the routine UPQC pay at the heap or small scale framework reproduction results are given to check the new usefulness of the hardware. Reenactment results are introduced to confirm the practicality of the proposed approach in MATLAB/SIMULINK condition.

Five-Level Flying Capacitor Converter used as a Static Compensator for Current Unbalances in Three-Phase Distribution Systems

This thesis presents and evaluates a solution for unbalanced current loading in three-phase distribution systems. The proposed solution uses the flying capacitor multilevel converter as its main topology for an application known as Unbalanced Current Static Compensator. The fundamental theory, controller design and prototype construction will be presented along with the experimental results. The Unbalanced Current Static Compensator main objective is the balancing of the up-stream currents from the installation point to eliminate the negative- and zero-sequence currents originated by unbalanced single-phase loads. Three separate single-phase flying capacitor converters are controlled independently using a d-q rotating reference frame algorithm to allow easier compensation of reactive power. Simulations of the system were developed in MATLAB/SIMULINK™ in order to validate the design parameters; then, testing of the UCSC prototype was performed to confirm the control algorithm functionality. Finally, experimental result are presented and analyzed

Poboljšanje kvalitete snage za željezničke sustave - pregled istraživanja

Railway traction is a more stochastic heavy load connected system. Due to the usage of ac-dc converters and ac-ac converters, the various power quality issues become the major problems in the electric system. This paper presents a review on power quality conditioners suitable for Railway traction based on the configuration, components involved and on the technical and economic considerations. More than 120 publications are listed in the reference for quick review.Željeznički električni sustav je prilično stohastički sustav s velikim opterečenjem. Zbog korištenja AC/DC i AC/AC pretvarača, problemi s kvalitetom isporučene energije predstavljaju glavne probleme električnih sustava. U ovome radu predstavljen je pregled područja vezano uz poboljšanje kvalitete energije za željezničke sustave ovisno o konfiguraciji, komponentama uključenim te o tehničkim i ekonomskim aspektima. Više od 120 radova navedeno je u popisu literature

Industrial and Technological Applications of Power Electronics Systems

The Special Issue "Industrial and Technological Applications of Power Electronics Systems" focuses on: - new strategies of control for electric machines, including sensorless control and fault diagnosis; - existing and emerging industrial applications of GaN and SiC-based converters; - modern methods for electromagnetic compatibility. The book covers topics such as control systems, fault diagnosis, converters, inverters, and electromagnetic interference in power electronics systems. The Special Issue includes 19 scientific papers by industry experts and worldwide professors in the area of electrical engineering

The Performance Enhancement of Control Strategy for Unified Power Quality Conditioner

วิศวกรรมศาสตรมหาบัณฑิต (วิศวกรรมไฟฟ้า), 2565This thesis proposes power quality improvement using a unified power quality conditioner (UPQC) in a balanced three-phase system. To improve the calculation of reference voltage and current, the harmonic identification by the power angle control method (PAC) has been developed with sliding window Fourier analysis (SWFA). In this thesis, the enhanced PAC algorithm is designed based on the apparent power control (UPQC-S). This approach is adopted to handle such as source voltage and load current problems. The unit vector template generation (UVTG) with PWM technique is applied to control the compensating voltage of the UPQC. In this work, the predictive controller is applied for the compensating current control on the dq-axis. This control is operated with the SVPWM technique to generate the switching state for the shunt active power filter. The predictive control with the SVPWM can provide good performance for the compensating current injection. The PI controller is used for the DC voltage bus control. The parameters of the PI controller are designed by using the root-locus technique in the z-plane. The proposed control strategy of UPQC is simulated using the processor in the loop (PIL) technique. For this technique, the MATLAB & Simulink program on the host computer is cooperated with the Code Composer StudioTM program for the eZdspTM F23885 board. The simulation results show that the proposed control strategy can mitigate the harmonic current, improve the power factor, and compensate for the voltage variations (sag and swell) in test cases. The performance indices for the power quality improvement are defined in the IEEE standard 519-2014. In addition, the predictive current control is tested to compare the performance of the harmonic current elimination with the SVPWM controller and the PI controller. After compensation, the predictive current control can provide better performance compared with those controllers even though the voltage source and the loads are changed. For the comparison study, the performance index is the percent of the current tracking error between the compensating current and the reference current.งานวิจัยวิทยานิพนธ์นี้นำเสนอการปรับปรุงคุณภาพกำลังไฟฟ้าด้วยวงจรปรับปรุงคุณภาพกำลังไฟฟ้ารวมสำหรับระบบไฟฟ้าสามเฟสสมดุล การระบุเอกลักษณ์ฮาร์มอนิกด้วยวิธีควบคุมมุมกำลังได้รับการพัฒนาร่วมกับการวิเคราะห์แบบฟูริเยร์วินโดว์เลื่อน เพื่อปรับปรุงสมรรถนะการคำนวณค่าแรงดันอ้างอิงและกระแสอ้างอิง วิธีควบคุมมุมกำลังที่ได้รับการพัฒนาถูกออกแบบบนพื้นฐานการควบคุมค่ากำลังไฟฟ้าปรากฏ แนวทางดังกล่าวสามารถแก้ปัญหาแรงดันที่แหล่งจ่ายและกระแสที่โหลดได้ การควบคุมแรงดันชดเชยอาศัยวิธีการควบคุมเวกเตอร์หนึ่งหน่วยทำงานร่วมกับเทคนิคการสวิตช์วิธีพีดับเบิลยูเอ็ม การควบคุมกระแสชดเชยในงานนี้พิจารณาใช้ตัวควบคุมแบบทำนายบนแกนดีคิว การออกแบบตัวควบคุมดังกล่าวพึ่งพาแบบจำลองทางคณิตศาสตร์ของวงจรกรองกำลังแอกทีฟแบบขนานบนแกนดีคิว ระบบควบคุมดังกล่าวทำงานร่วมกับเทคนิคการสวิตช์วิธีสเปซ เวกเตอร์พีดับเบิลยูเอ็ม เพื่อสร้างสมรรถนะการสวิตช์สำหรับวงจรกรองกำลังแอกทีฟแบบขนาน การควบคุมแรงดันบัสไฟตรงใช้ตัวควบคุมพีไอ ตัวควบคุมดังกล่าวได้รับการออกแบบในโดเมนเวลาไม่ต่อเนื่องด้วยเทคนิคทางเดินรากบนระนาบซี กลยุทธ์ควบคุมสำหรับวงจรปรับปรุงคุณภาพกำลังไฟฟ้ารวมถูกจำลองสถานการณ์ด้วยเทคนิคโปรเซสเซอร์ในลูป ซึ่งเทคนิคดังกล่าวดำเนินการด้วยโปรแกรม MATLAB/Simulink โปรแกรม Code Composer Studio และบอร์ด eZdspTM F23885 ผลการทดสอบ พบว่า กลยุทธ์ควบคุมที่ได้พัฒนาขึ้นสามารถกำจัดกระแสฮาร์มอนิก ปรับปรุงค่าตัวประกอบกำลัง และชดเชยแรงดันทางด้านโหลดกรณีแรงดันตกชั่วขณะและเกินชั่วขณะ ในทุกสภาวะโหลดที่ทำการทดสอบ ค่าดัชนีชี้วัดสมรรถนะอ้างอิงตามกรอบมาตรฐานของ IEEE standard 519-2014 นอกจากนี้ตัวควบคุมแบบทำนายยังได้รับการทดสอบเพื่อเปรียบเทียบสมรรถนะการกำจัดกระแสฮาร์มอนิกกับตัวควบคุมแบบวิธีสเปซเวกเตอร์พีดับเบิลยูเอ็ม และตัวควบคุมพีไอ ผลการศึกษาปรากฏว่า ตัวควบคุมกระแสแบบทำนายสามารถควบคุมการฉีดกระแสชดเชยได้ดีกว่า โดยพิจารณาจากค่าความคลาดเคลื่อนระหว่างกระแสอ้างอิงและกระแสชดเชย ซึ่งภายหลังการชดเชย พบว่า ตัวควบคุมแบบทำนายให้สมรรถนะการกำจัดกระแสฮาร์มอนิกที่ดีกว่าตัวควบคุมแบบวิธีสเปซเวกเตอร์พีดับเบิลยูเอ็ม และตัวควบคุมพีไอ ถึงแม้ว่าแหล่งจ่ายแรงดันและโหลดของระบบทดสอบจะมีการเปลี่ยนแปล

A Passive LC Filter Based Harmonic Compensation for Multilevel Cascaded Inverters under Unbalanced DC Sources Using NVM Control Technique

This work proposes passive lc filter network based multilevel cascaded inverters with beating width-modulation action to accomplish counterbalanced line-to-line achievement voltages and to aerate the modulation basis in the beeline modulation ambit area the achievement voltage can be linearly adapted in the multilevel cascaded inverter (MLCI) operating beneath asymmetric dc-link conditions. A neural voltage modulation action is proposed to accomplish achievement voltage acclimation as able-bodied as to extend the beeline modulation ambit up to the best attainable point in theory. In the proposed method, too ample of a dc-link alterity precludes the acclimation of the achievement voltages. The simulations for a seven-level phase-shifted articulate MLCI for electric car absorption motor drive appearance that the proposed adjustment is able to antithesis line-to-line achievement voltages as able-bodied as to aerate the beeline modulation ambit beneath the asymmetric dc-link conditions

Design of controllers for electrical power systems using a complex root locus method

© 20xx IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.A large class of three-phase electrical power systems possess symmetry conditions that make it possible to describe their behavior using single-input single-output transfer functions with complex coefficients. In such cases, an extended root locus method can be used to design control laws, even though the actual systems are multi-input multi-output. In this paper, the symmetric conditions for a large class of power systems are analyzed. Then, the root locus method is revisited for systems with complex coeffcients and used for the analysis and control design of power systems. To demonstrate the benefits of the approach, this paper includes two examples: 1) a doubly fed induction machine and 2) a three-phase LCL inverter.Postprint (author's final draft

A Survey on Multi-Active Bridge DC-DC Converters: Power Flow Decoupling Techniques, Applications, and Challenges

Multi-port DC-DC converters are a promising solution for a wide range of applications involving multiple DC sources, storage elements, and loads. Multi-active bridge (MAB) converters have attracted the interest of researchers over the past two decades due to their potential advantages such as high power density, high transfer ratio, and galvanic isolation, for example, compared to other solutions. However, the coupled power flow nature of MAB converters makes their control implementation difficult, and due to the multi-input, multi-output (MIMO) structure of their control systems, a decoupling control strategy must be designed. Various control and topology-level strategies are proposed to mitigate the coupling effect. This paper discusses the operating principles, applications, methods for analyzing power flow, advanced modulation techniques, and small signal modelling of the MAB converter. Having explained the origin of cross-coupling, the existing power flow decoupling methods are reviewed, categorized, and compared in terms of effectiveness and implementation complexity