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4th International Conference on Control Engineering and Information Technology (CEIT)

作者： Manai, Lazhar Dabboussi, Mounir Armi, Faouzi Besbes, Mongi Higher Inst Informat & Commun Technol Boj Cedria BP 123 Hammam Chatt 1164 Tunisia Res & Technol Ctr Energy CRETn Photovolta Lab LPV BP 95 Hammamlif 2050 Tunisia Higher Inst Comp Sci & Math Monastir Monastir Tunisia

ISBN: (纸本)9781509010554

This paper deals with the control design of an asymmetrical cascaded multilevel inverter. This structure therefore provides the capability to produce higher voltages at higher speeds with low switching frequency which has inherent low switching losses and high converter efficiency. Selective harmonic elimination(SHE) for asymmetrical multilevel CHB inverter control is proposed. The technique utilized in the estimation of switching angles involves Firefly algorithm (FFA). Compared to newton raphson algorithm (NR), FFA is more robust and entails less computation time. Simulation results prove the effectiveness of FFA technique compared to NR algorithm. The proposed method does effectively eliminate a number of specific low order harmonics, and the output voltage is resulted in low total harmonic distortion. FFA and NR algorithm for asymmetrical cascaded H-bridge nine level inverter control are experimentally tested on a prototype using FPGA.

关键词： Asymmetrical CHB multilevel inverter newton raphson algorithm firefly algorithm Switching angles SHE FPGA

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Solid-state transformer modelling in power flow calculation

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ENERGY REPORTS 2023年 9卷 448-453页

作者： Javid, Zahid Karaagac, Ulas Kocar, Ilhan Holderbaum, William Hong Kong Polytech Univ Dept Elect Engn Hung Hom Kowloon Hong Kong Peoples R China Manchester Metropolitan Univ Sch Engn John Dalton BldgChester St Manchester M15GD England

This article proposes a novel Solid-State Transformer (SST) power flow (PF) model which is implemented with Modified Augmented Nodal Analysis (MANA) formulation using newton-raphson (NR) algorithm. Any network topology can be handled by the MANA formulation, and it can be easily and methodically expanded to include other components, like SST. Since various types of buses can have various type converters and SSTs, the sum of line flows are used instead of classical bus power injections equations. The proposed approach is coded in MATLAB and tested on an IEEE 33 bus distribution test feeder. The results are compared with Holomorphic Embedding PF method (HE-PFM) and with existing methodology in literature. In line with the findings, the proposed approach achieves accurate representation of SST, better convergence characteristics with a faster simulation speed compared to HE-PFM.

关键词： Modified augmented nodal analysis newton raphson algorithm Power flow Solid-state transformer

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Optimization of Losses Joule in the Congolese Electrical Network Integrated with the Energy Pool of Central Africa in the PEAC Acronym

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Energy and Power Engineering 2022年第1期14卷 13-34页

作者： Mathurin Gogom Courad Onesime Tsahat Oboulhas Nianga Apila Anedi Oko Ganongo Désiré Lilonga-Boyenga Laboratoire de Génie Electrique et Electronique Ecole Nationale Supérieure Polytechnique Université Marien Ngouabi Brazzaville Congo

Joule losses in the power grids are a factor in the degradation of power grid equipment (lines and transformers), but also a shortfall for power companies, which must maximize their revenues. This is why in this article we present a study on the optimization of joule losses in a meshed electricity network interconnected to a very high voltage power line crossing Congolese territory for nearly one thousand five hundred (1500) kilometers. The value of interconnections no longer needs to be demonstrated in view of these technical, economic and social advantages. The object of this study is to assess the optimal node where the interconnection can be achieved which would cause fewer joule losses in the networks to be interconnected on this line. Indeed, it can have several possible nodes where the interconnection can be carried out, so it is necessary to simulate each configuration in order to evaluate the losses using the hybrid method including the genetic algorithm to provide different configurations and the newton raphson algorithm. Advanced integrating FACTS devices in this case STATCOM to perform load flow. The results are interesting because by injecting electrical energy to the network or to the line to the same selected, the joule losses are within the standards provided by the International Electrotechnical Commission.

关键词： Interconnection Joule Losses Configuration Genetic algorithm newton raphson algorithm FACTS and Load Flow

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CHB inverter with DC-link capacitor balancing and total harmonic minimization

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ARCHIVES OF ELECTRICAL ENGINEERING 2018年第1期67卷 81-93页

作者： Armi, Faouzi Manai, Lazhar Besbes, Mongi Natl Engn Sch Tunis Lab Robot Informat & Complex Syst RISC Tunis Tunisia Univ Carthage Higher Inst Informat & Commun Technol Tunis Tunisia

A cascaded H-bridge (CHB) multilevel inverter generally requires several DC sources. An alternative option is to replace the separate DC source feeding an H-bridge cell with a capacitor, while maintaining the other H-bridge cell with a real DC voltage source. In this paper a 7-level cascaded H-bridge inverter with a single DC-source is presented. This paper focuses mainly to achieve effective capacitor voltage balancing and selective harmonic elimination (SHE) based on the newton raphson algorithm (N-R). It shows hope to reduce the voltage ripple of the capacitors, which leads to higher power conversion efficiency with equal power distribution, reduces the initial cost, and complexity hence it is apt for industrial applications. Simulation results support the proposed control technique.

关键词： CHB inverter capacitor voltage balancing switching angles newton raphson algorithm SHE THD

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An Improved Method for MPPT for Wind Solutions Using newton raphson Technique With Stability Analysis of the Optimal Power Curve

An Improved Method for MPPT for Wind Solutions Using Newton ...

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International Conference on 21st Century Energy Needs - Materials, Systems and Applications (ICTFCEN)

作者： Asthma, Dhawal N. Sahay, Kishan Bhushan Sahu, Suneet Chaturvedi, Devesh Madan Mohan Malaviya Univ Technol Dept Elect Engn Gorakhpur Uttar Pradesh India

ISBN: (纸本)9781509035649

The increasing stress on the rapidly diminishing conventional sources of energy like coal and fossil fuels and the devastating ramifications posed by their use in energy production has compelled man to look for cleaner and voluminous alternative sources of energy. Among the various renewable sources of energy, wind happens to be the most abundant and omnipresent one. However, there are various implications that arise when it comes to designing of efficient wind generators and integrating these systems into the main grid. Enhancement of the overall efficiency is a major cause of concern due to certain unavoidable constraints in the mechanical design of these turbines. In this paper, a novel MPPT algorithm optimized by newton raphson technique based on hill climbing search (HCS) strategy has been implemented for a wind turbine cascaded with a permanent magnet synchronous generator subjected values of wind velocity. The eligibility of the proposed methodology has been highlighted through in depth analysis of the stability of the system for operation along the optimal power reference curve obtained by the algorithm.

关键词： HCS MPPT newton raphson algorithm (Wind energy conversion system) WECS System

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New Topology of Cascaded Multilevel Inverter with Reduced Number of Switches Control Considering Lower Order Harmonics Elimination 4

New Topology of Cascaded Multilevel Inverter with Reduced Nu...

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4th International Conference on Control Engineering and Information Technology (CEIT)

作者： Manai, Lazhar Armi, Faouzi Besbes, Mongi Higher Inst Informat & Commun Technol BP 123 Hammam Chatt 1164 Tunisia Res Ctr & Energy Technol BP 95 Hammam Lif 2050 Tunisia

ISBN: (纸本)9781509010554

In this paper a new topology of cascaded H-bridge (CHB) multilevel inverter employing less number of switches, is presented. Different method regarding harmonic elimination has been proposed to eliminate the lower levels of harmonics in order to generate better power quality and lower total harmonic distortion (THD) waveform. newton raphson (N-R) algorithm is investigated for the selective harmonic elimination (SHE) to calculate switching angles for the proposed topology. Based on simulation studies, performance of the proposed algorithm for nine level modified cascaded H-bridge inverter, is evaluated and experimentally tested on a prototype using FPGA to implement SHE based on N-R algorithm.

关键词： parallel/serial CHB multilevel inverter newton raphson algorithm Switching angles SHE THD FPGA

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Pseudo-loadflow formulation as a starting process for the newton raphson algorithm

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INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS 2010年第8期32卷 835-839页

作者： Irving, Malcolm Brunel Univ Brunel Inst Power Syst Uxbridge UB8 3PH Middx England

This paper introduces new models which approximate the AC loadflow problem, but are able to converge (using the newton raphson algorithm) from a wider range of starting points. The solution of the pseudo-loadflow models can provide a robust starting process for the newton raphson solution of the conventional loadflow problem. It is also shown that pseudo-loadflow solutions exist in many cases where the AC loadflow equations do not appear to have any solution, and in such cases the pseudo-loadflow solution can provide useful information to assist in locating the cause of infeasibility of the AC loadflow model. Test results are presented for illustrative small network examples and also for larger test networks. The computational requirements of the proposed methods are similar to those of the conventional newton raphson loadflow algorithm. (C) 2010 Elsevier Ltd. All rights reserved.

关键词： Power flow newton raphson algorithm Starting process

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Comparison of Power flow control: TCSC versus UPFC

Comparison of Power flow control: TCSC versus UPFC

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Joint International Conference on Power Systems Technology (POWERCON)/IEEE Power India Conference

作者： Mubeen, Samina E. Nema, R. K. Agnihotri, Gayatri MANIT Dept Elect Engn Bhopal India

ISBN: (纸本)9781424417636

In an A.C Transmission system power flow can be controlled by injecting a compensating voltage in series with the line. Thyristor Controlled series compensator(TCSC) are utilized as a conventional means for the purpose while Unified power flow controller (UPFC)is the latest converter based devices employing fast power electronic equipments. This paper utilizes the steady state model of Thyristor controlled series capacitor and a unified power flow controller for series voltage compensation, and evaluating their range of power flow control for simple network. The models are incorporated into the existing newton raphson load flow algorithm. The iterative equations of the newton raphson load flow algorithm are modified by the device parameters and the combined set of power flow equations and UPFC or the TCSC control equations are solved for convergence of the formula. Matlab codes are utilized for the implementation of the two devices in the newton-raphson algorithm. Power flow control ranges are evaluated for few IEEE bus systems and standard 5 bus system. Results are reported and studies are presented to illustrate and compare the effectiveness of the UPFC and TCSC.

关键词： Control Strategy Converters Matlab newton raphson algorithm Power flow TCSC UPFC

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Z-TRANSFORM ELECTROMAGNETIC TRANSIENT ANALYSIS OF CROSSBONDED CABLE TRANSMISSION-SYSTEMS

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IEE PROCEEDINGS-C GENERATION TRANSMISSION AND DISTRIBUTION 1981年第2期128卷 55-62页

作者： HUMPAGE, WD WONG, KP NGUYEN, TT Department of Electrical & Electronic Engineering University of Western Australia Crawley Australia

A recursive time-domain formulation for electromagnetic transient analysis in power networks has recently been derived drawing on a particular transformation sequence in which thez-transform has a central part. Following its original development primarily in the context of overhead lines, the present paper investigates the possible rÔle of the formulation in transient propagation in crossbonded underground cable systems. In those terms, the earlierz-plane analysis scheme extends easily to the conductor and sheath configuration of a cable section between points of successive sheath discontinuities. It is then shown in the paper, in detailed working, how the boundary conditions of sheath transpositions, sheath earthing, and surge-arrester connections may be introduced into analysis. From the outcome of this working, an overall solution procedure is formulated for a cable system of any arbitrary number of sections in terms of the individual section equations rearranged to comply with the boundary conditions which they are required to fulfil. A newton-raphson algorithm is used to solve the nonlinear equations of surge arresters in conjunction with those of the cable sheaths to which they are connected. Close comparisons with solutions from an established Fourier transform method confirm, as in the overhead line case, the high underlying accuracy ofz-transform analysis. Computing time requirements have a dependence on the number of sections into which the complete cable system is subdivided: for three sections,z-transform computing times are about 1% of those in Fourier transform analysis

关键词： Network and transmission line calculations Integral transforms underground cable systems surge arresters nonlinear equations transients power networks electromagnetic transient analysis transient propagation Fourier transform newton raphson algorithm underground cables transmission networks Z transforms crossbonded cable transmission systems

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newton-raphson algorithm FOR 3-PHASE LOAD FLOW

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PROCEEDINGS OF THE INSTITUTION OF ELECTRICAL ENGINEERS-LONDON 1974年第7期121卷 630-638页

作者： WASLEY, RG SHLASH, MA UNIV MANCHESTER INST SCI TECHNOLPOB 88MANCHESTER M60 1QDENGLAND

One of the problems encountered in power-systems operation is the generation of unbalanced voltages and currents in the presence of long transmission lines with few or no transpositions, including possible unbalances arising in source and load conditions, or indeed any items of plant such as shunt and series reactors. To improve or investigate these unbalance effects in any detail, a 3-phase-load-flow solution that allows representation of all possible unbalances as they exist in the power-systems network without making any assumptions is essential. Consequently, a working newton-raphson algorithm is presented, which forms the basis of a computer program developed for the specific purpose of solving the 3-phase-load-flow problem. An indication of program facilities is given, together with sample results for illustration.

关键词： newton raphson algorithm computer program three phase load flow load (electric) Network and transmission line calculations electrical engineering application of computers unbalance effects power system operation Power engineering computing electrical engineering applications of computers transmission network calculations

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