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Smart Systems for applications in Electrical Sciences (ICSSES), International Conference on

作者： N Kaushik Raja R Pradyumna Meenakshi Jayaraman Nilanjan Tewari School of Electrical Engineering Vellore Institute of Technology Chennai Tamil Nadu India

ISBN: (数字)9798331507671

ISBN: (纸本)9798331507688

An algorithm is developed for the generation of pulse width modulated signals using Dual Reference modulation (DRM) for a five level inverter used in Photovoltaic (PV) based electrical power generation systems. With five level inverters offering a significant edge over the conventional inverters along with an efficient algorithm that is developed in this work, it becomes extremely simple and viable for implementation. This algorithm is made to be compatible with Arduino to facilitate easier implementation while also focusing on reducing the Total Harmonic Distortions (THD) below what conventional five level inverters offer. The developed algorithm to generate PWM signals uses DRM technique that employs one carrier signal and two reference signals. Extensive simulations have been carried out in Simulink. The five level inverter with a reduced number of switches is fabricated and tested on an experimental setup. Experiments have been carried out on the developed inverter and its performance is analyzed considering voltage, current and THD on the output for different modulation indices and switching frequencies. For a switching frequency of 2 kHz and a modulation index of 1, THD obtained with the five level inverter is around $\mathbf{2 0 \%}$ . It is inferred that the implemented PWM algorithm on the inverter produced five levels on the output with an easier implementation algorithm, while employing a reduced number of switches.

关键词： Photovoltaic systems Total harmonic distortion Software packages Switching frequency Software algorithms Focusing Voltage pulse width modulation Inverters Standards

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Piecewise pulse-width modulation for neutral-point current reduction in NPC inverter

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IET POWER ELECTRONICS 2025年第1期18卷

作者： Savastianov, Mikhail Smedley, Keyue Univ Calif Irvine Dept Elect Engn & Comp Sci Irvine CA 92697 USA

Effective neutral-point balancing in a neutral-point-clamped inverter can yield substantial benefits, including cost reduction and efficiency improvement for the system. This article proposes a new piecewise pulse-width modulation designed to reduce low-frequency oscillations of the neutral-point current without compromising the inverter power losses. The proposed piecewise modulation is simple to implement as it has one reference signal per phase. The performance of the proposed modulation is validated through comprehensive comparisons with alternative methods. The obtained simulation and experimental results demonstrate the effectiveness of the proposed piecewise modulation.

关键词： DC-AC power convertors pulse width modulation

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Quasi Z-Source Inverter with Simple Boost and Maximum Boost pulse width modulation Techniques for PV Grid Connection 5th

Quasi Z-Source Inverter with Simple Boost and Maximum Boost ...

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5th International Conference on Recent Developments in Control, Automation and Power Engineering, RDCAPE 2023

作者： Kamatchi Kannan, V. Ponmurugan, P. Srimathi, R. Vijayakumar, G. Parimalasundar, E. Suresh, K. EEE Knowledge Institute of Technology Salem India Chennai600078 India Associate Professor/SELECT Vellore Institute of Technology Chennai India Department of Electrical Engineering Sanjivani College of Engineering Kopargaon India Tirupati India EEE Christ University Bangalore India

ISBN: (纸本)9789819600885

The voltage-fed quasi Z-source inverter (qZSI) is emerged as a promising solution for photovoltaic (PV) applications. This paper proposes a novel high-gain partition input union output dual impedance quasi Z-source inverter (PUDL-qZSI) for PV grid-connected system. This advanced inverter design achieves exceptionally low shoot-through duty ratios and high modulation index, resulting in a superior output current with reduced total harmonic distortion (THD). To modulate three-phase qZSIs and other equivalent topologies, a variety of modulation schemes may be used, some of which involve two extra reference signals to generate shoot-through state. The simulation is carried out on the MATLAB/Simulink environment with PV-based grid-connected PUDL-qZSI to measure the harmonic distortion and power measurement. The proposed inverter is subjected to two different pulse width modulation (PWM) analysis are simulated and compared to validate the proposed system. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2025.

关键词： pulse width modulation

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Enhanced multi-carrier level shift pulse width modulation using a variable amplitude carrier scheme for multilevel inverters 4

Enhanced multi-carrier level shift pulse width modulation us...

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4th International Conference on Power, Control and Computing Technologies, ICPC2T 2025

作者： Karri, Krishna Kumari Singh, Varsha Pattnaik, Swapnajit Department of Electrical Engineering National Institute of Technology Raipur India

ISBN: (纸本)9798331530402

Reduced component Multilevel inverters (RCMLIs) are gaining popularity in industrial applications due to their enhanced output quality when compared to traditional inverters. A critical parameter for evaluating this output quality is Total Harmonic Distortion (THD). By selecting the appropriate pulse width modulation (PWM) techniques, it is possible to reduce THD effectively. High-frequency PWM schemes are particularly beneficial for switched capacitor MLIs, as they assist in managing capacitor inrush currents and enhancing capacitor lifespan. The newly proposed Variable Magnitude Multi-Carrier Level Shift PWM (PVMMCLSPWM) shows a notable decrease in THD compared to other high-frequency PWM methods available in the literature. Simulations of this technique have been conducted using a symmetrical nine-level MLI and benchmarked against the traditional Multi-Carrier Level Shift Phase Disposition PWM (MCLSPDPWM). The results of the comparative analysis highlight the enhanced performance of PVMMCLSPWM in minimizing THD. © 2025 IEEE.

关键词： pulse width modulation

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Research on Selective Harmonic Elimination pulse width modulation of Three-Level NPC Inverter Based on Adaptive Restart Genetic Algorithm

Research on Selective Harmonic Elimination Pulse Width Modul...

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International Russian Smart Industry Conference (SmartIndustryCon)

作者： Tao Jing Yuehua Liang A. S. Maklakov A. A. Nikolaev School of Computer and Information Engineering Henan University Kaifeng Henan China Zhejiang Entive Smart Kitchen Appliance Co. Ltd. Shengzhou Zhejiang China Department of Automation and Control Moscow Polytechnic University Moscow Russia Department of Automated Electric Drive and Mechatronics Nosov Magnitogorsk State Technical University Magnitogorsk Russia

ISBN: (数字)9798331511241

ISBN: (纸本)9798331511258

The harmonic elimination task of three-level neutral point clamped (3L-NPC) inverters is related to a complicated engineering optimization problem, which mainly involves constrained nonlinear transcendental equations with multiple solutions. In order to solve the problems of difficult initial value determination, slow convergence rates and susceptibility to local optima trapping in the process of using traditional numerical algorithms, This paper introduces a novel selective harmonic elimination pulse width modulation (SHEPWM) framework, enhanced by an adaptive restart genetic algorithm, to address the limitations of conventional optimization methods. By introducing the adaptive restart mechanism, the performance and robustness of the solution algorithm can be improved, so as to circumvent entrapment in local optima and secure the global optimum across the entire solution space. The simulation results show that there are divergent trends in the switching angles and the total harmonic distortion (THD) values of the output voltage obtained by the proposed method, but all of them can effectively eliminate the specified low-order harmonics. These findings verifies the practical applicability and solution diversity of the proposed method, as well as provides new ideas and methods for solving optimization problems in other engineering fields.

关键词： Total harmonic distortion Voltage Switches pulse width modulation Harmonic analysis Inverters Robustness Systems simulation Genetic algorithms Convergence

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Enhanced Multi-Carrier Level Shift pulse width modulation Using a Variable Amplitude Carrier Scheme for Multilevel Inverters

Enhanced Multi-Carrier Level Shift Pulse Width Modulation Us...

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Power, Control and Computing Technologies (ICPC2T), Conference on

作者： Krishna Kumari Karri Varsha Singh Swapnajit Pattnaik Department of Electrical Engineering National Institute Of Technology Raipur India

ISBN: (数字)9798331530402

ISBN: (纸本)9798331530419

关键词： Computers Total harmonic distortion Frequency modulation Capacitors Power control Switches pulse width modulation Multilevel inverters Topology Surges

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Back-EMF based Control of BLDC Motors using pulse width modulation Technique

Back-EMF based Control of BLDC Motors using Pulse Width Modu...

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International Conference on ent Computing and Control Systems (ICICCS)

作者： Karthikeyan S Thilagavathi P Kaviya S Nithyasri M Shalini E Vinitha R Department of Electronics and Communication Engineering K.S.R. College of Engineering Tiruchengode India

ISBN: (数字)9798331512088

ISBN: (纸本)9798331512095

A brushless DC motor that does not have the physical brushes and does its work through electronic commutation. It has low maintenance and a longer life span while being of high operating efficiency. Motor control methods have been developed and both of these methods have been implemented in this work to analyze the performance of a Brushless DC (BLDC) motor. This purpose of this work was to evaluate how the speed (RPM) of the BLDC motor changes as the voltage levels vary (from 1V to 24V). The Proposed method eliminates the Hall Sensor and using the back-EMF signals for rotor estimation, thereby reducing system complexity and cost. The Hall sensor informs the controller of the motor's position in the sensor based approach while in the sensorless method, the motorʹs position is estimated with the back-EMF theory. This contributes to lowering costs. The RPM range for motors without sensor RPM is from 120 RPM to 2880 RPM and for motors with sensors from 99 RPM to 2180 RPM. This allows the BLDC motors to enhance the effective control system reliability at low cost. It has many useful applications in electric vehicles, automated tools usage and robotics.

关键词： Costs Power supplies Velocity control Rotors Sensorless control pulse width modulation Reliability theory Robot sensing systems Motors Standards

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An AC Copper Loss Calculation Scheme of Synchronous Motor with Rectangular Conductors Considering pulse width modulation Harmonics

An AC Copper Loss Calculation Scheme of Synchronous Motor wi...

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IEEE Conference on Electromagnetic Field Computation

作者： Vu-Khanh Tran Jae-Gil Lee Pil-Wan Han Yon-Do Chun Energy and Power Conversion Engineering Korea National University of Science and Technology Daejeon Republic of Korea Electric Machine and Drive Research Center Korea Electrotechnology Research Institute Changwon Republic of Korea

ISBN: (数字)9798350348958

ISBN: (纸本)9798350348965

This paper presents an efficient method for calculating AC copper loss in interior permanent magnet synchronous motor (IPMSM) with rectangular conductors, considering pulse width modulation (PWM) current harmonics. The inverter-fed current for driving IPMSM can be decomposed into fundamental and harmonic currents. The proposed method first utilizes magneto-static finite element analysis (MS FEA) to compute the magnetic vector potential (MVP) generated by the fundamental current. Next, the frozen permeability method linearizes the FEA model by keeping the permeability of iron core. A single harmonic current is input into linear-MS FEA to compute MVP without permanent magnet excitation. The MVP of other harmonic currents are derived using linear fitting. The linear fitting of MVP is validated with FEA. Finally, the AC copper loss is then calculated by summing the contributions from the MVP of each current component.

关键词： Magnetic cores Fitting pulse width modulation Harmonic analysis Conductors Permanent magnets Permeability

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Reduction Method of Circulating Current in Parallel Three-Level Inverters Using Modified Discontinuous pulse-width modulation Based on Interleaving Scheme

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IEEE TRANSACTIONS ON POWER ELECTRONICS 2024年第2期39卷 2322-2333页

作者： Choi, Hye-Won Lee, Kyo-Beum Ajou Univ Dept Elect & Comp Engn Suwon 16499 South Korea

This article presents a reduction method of circulating current in parallel three-level inverters using modified discontinuous pulse-width modulation (DPWM) based on an interleaving scheme. The harmonics and current ripple are the same as that of a single inverter with the same current capacity as the parallel system with DPWM. An interleaved DPWM improves the output current quality. However, a circulating current is generated by the asynchronous phase carriers. The circulating current limits the power rating. To alleviate these problems, the proposed method reduces the high-frequency circulating current with switching frequency by 79% even at a high modulation index. The switching sequence and high-frequency circulating current are analyzed to prove the performance of the proposed method. The effectiveness and reliability of the proposed reduction method are compared to the conventional SVM. The validity of the proposed method is verified through simulations and experimental results.

关键词： Inverters Voltage Switches modulation Power harmonic filters pulse width modulation Harmonic analysis Circulating current discontinuous pulse-width modulation (DPWM) interleaving scheme parallel-three-level inverter

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Current fluctuations reduction strategy based on optimal three-space-vector pulse-width modulation for service-life improvement of DC-link electrolytic capacitors in three-phase voltage-source inverter system

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IET ELECTRIC POWER APPLICATIONS 2024年第1期18卷 128-140页

作者： Li, Peihe Shen, Anwen Tang, Qipeng Luo, Xin Xu, Jinbang Huazhong Univ Sci & Technol HUST Sch Artificial Intelligence & Automat Natl Key Lab Sci & Technol Multispectral Informat Wuhan Peoples R China Huazhong Univ Sci & Technol HUST Sch Artificial Intelligence & Automat Key Lab Image Proc & Intelligent Control Wuhan Peoples R China

The authors propose a current fluctuation reduction strategy based on optimal three-space-vector pulse-width modulation (TSVPWM), which is used to improve the service-life of the dc-link electrolytic capacitors in two-level three-phase voltage-source inverter (VSI) system. Differing from the typical SVPWM-based method that employs two adjacent active voltage vectors and zero voltage vectors to synthesise the reference voltage, the proposed strategy selects the required voltage vectors based on the minimum dc-link electrolytic capacitor current fluctuation. With the proposed strategy, an objective function for the root-mean-square value of dc-link electrolytic capacitor current is first constructed under the constraint of eight permissible voltage vectors. And then, by solving the minimum of the objective function through the piecewise linear programming, the optimal three voltage vectors under the different modulation ratios and load power factors are obtained accordingly, so as to achieve the minimum dc-link electrolytic capacitor current fluctuations during each switching period. Meanwhile, a PWM implementation scheme based on positive-negative double carrier signals is presented, which not only simplifies the implementation process but also effectively reduces the switching losses of power devices. Finally, the experimental results demonstrate that the proposed strategy can minimise the dc-link electrolytic capacitor current fluctuation under different working conditions. Based on space voltage vector, a voltage vector combination was derived to minimise the capacitor current within a single switching cycle. Compared to the traditional SVPWM, experimental results have shown that the rms value of capacitor current can be reduced by up to 37%.image

关键词： motor drives power capacitors pulse width modulation PWM power convertors

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