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Fractional-Order Modeling and Steady-State Analysis of Single-Phase Quasi-Z-Source pulse width modulation Rectifier

IEEE ACCESS 2024年 12卷 124141-124159页

作者： Zhu, Xiaoquan Chen, Ziwen Zhang, Bo Nanjing Univ Aeronaut & Astronaut Coll Automat Engn Nanjing 211106 Peoples R China South China Univ Technol Sch Elect Power Guangzhou 510641 Peoples R China

This paper focuses on the fractional-order modeling and analysis of single-phase quasi-Z-source rectifier (qZSR), aims to extend the single-phase qZSR from integer-order domain to fractional-order domain. Additionally, it has been demonstrated explicitly the mechanism by which fractional-order inductors (FOIs) and fractional-order capacitors (FOCs) affect the operating features of fractional-order quasi-Z-source rectifier (FO-qZSR). The fractional-order circuit model is built based on oustaloup's approximation method, the operational principle and control strategy of FO-qZSR, the expression of input current, inductor current, capacitor voltage and output voltage are also derived and analyzed in detail. Then, the above theoretical analysis is verified by simulation results by using the fotf toolbox in Matlab/Simulink, and the FO-qZSR presents more flexible and diverse operating features than integer-order qZSR. Finally, the hardware prototype is established with the help of the RT-LAB platform and the experimental results are consistent with the theoretical analysis and simulation results.

关键词： Rectifiers Inductors Capacitors pulse width modulation Analytical models Voltage control Integrated circuit modeling PD control Fractional calculus fractional-order inductor fractional-order capacitor fractional-order PID controller quasi-Z-source rectifier

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A pulse width modulation-Based Sliding Mode Controller for Phase-Shifted Full-Bridge Converter With Diodes in Series on the Lagging Leg

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IEEE ACCESS 2024年 12卷 174006-174016页

作者： Li, Changshuo Zhou, Wei Yang, Qunhui Ji, Fuwu Tongji Univ State Key Lab Marine Geol Shanghai 200092 Peoples R China Tongji Univ China Natl Sci Seafloor Observ Project Management Off Shanghai 200092 Peoples R China Tongji Univ Sch Elect & Informat Engn Shanghai 201804 Peoples R China

The typical strategy for the phase-shifted full-bridge (PSFB) converter is to design a linear compensator based on a small-signal model. However, this approach cannot provide a strongly robust output under changing operating conditions or with perturbations in the converter parameters. In this article, a fixed-frequency pulse width modulation (PWM) based full-order sliding mode controller is proposed to improve the performance of a PSFB converter with diodes in series on the lagging leg. Firstly, to facilitate the application of sliding control laws, we construct a simplified equivalent control model by analyzing the phase-shifted modulation and operating waveforms of the converter. Secondly, we derive strict existence conditions for the sliding phases to ensure that the state trajectories fulfill the requirements. Thirdly, the perturbations of both the external and internal variables are considered in the equivalent control function to improve the stability of the controller. Finally, simulation and experimental results verify that the proposed sliding mode controller provides better dynamic regulation performance and robustness than does a linear controller.

关键词： Control systems Switches Robustness Legged locomotion Voltage control Topology pulse width modulation Perturbation methods Capacitors Switching frequency Sliding mode control Phase-shifted full-bridge sliding mode control pulse-width modulation equivalent control law robustness

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Space Vector Phase Disposition-pulse width modulation and Multiband Hysteresis Through Digital Implementation for a Type-G Converter: A Comparative Study

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IEEE INDUSTRY APPLICATIONS MAGAZINE 2024年第6期30卷 43-55页

作者： Leal, Daniel F. Stopa, Marcelo M. Luiz, Alex-Sander A. Ctr Fed Educ Tecnol Minas Gerais Dept Elect Engn BR-30510000 Belo Horizonte Brazil

In the last decades, aiming to control some processes and improve high-power system efficiency, multilevel converters have been commonly applied in adjustable-speed and high-performance drives in the mining and petrochemical industries. Although they present operational advantages over the classic two-level topology in high-power and medium-voltage applications, the implementation of their current control still has some issues that deserve additional studies. In this line, this work presents a comparative study of two current control techniques for a five-level neutral point clamped (NPC) inverter for induction motor drives: 1) linear current control with space vector pulse width modulation (SV-PWM) command (normally applied in commercial drives) and 2) nonlinear digital hysteresis current control. A multiband (MB) switching frequency limiter is presented in this article for the last technique. The multilevel power electronic converter investigated here is an NPC converter known as a type-G converter. Some challenges for the implementation of digital MB hysteresis are discussed. In this article, a digital signal processor (DSP) is selected for both strategies, while a field-programmable gate array (FPGA) is employed to implement the frequency-limiting circuits and switching logic of the digital hysteresis control. In both cases, the drive operates under the indirect implementation of rotor field-oriented control (RFOC). Simulation results obtained from PLECS and experimental results in a 2-hp laboratory prototype are presented and discussed.

关键词： Hysteresis Inverters Current control Switches pulse width modulation Topology Switching frequency

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pulse width modulation Method for Reliability Improvement of DC-link Capacitors and Power Devices of NPC Inverter 11

Pulse Width Modulation Method for Reliability Improvement of...

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11th International Conference on Power Electronics - ECCE Asia, ICPE 2023-ECCE Asia

作者： Choi, Jae-Heon Choi, Ui-Min Seoul National University of Science and Technology Department of Smart Ict Convergence Engineering Korea Republic of

ISBN: (纸本)9788957083505

Power devices and DC-link capacitors are considered reliability-critical components in power converters. Thermal stress caused by power loss leads to wear-out failures of DC-link capacitors and power devices. Previous studies have proposed various PWM methods to reduce the thermal stress of DC-link capacitors and power devices, respectively. However, the existing methods did not consider the reduction of thermal stress of DC-link capacitors and power devices simultaneously. This paper proposes the PWM method for improving the reliability of the NPC inverter by decreasing the thermal stress of DC-link capacitors and power devices concurrently. Through the simulations and experiments, the feasibility and effectiveness of the proposed PWM method are verified. © 2023 The Korean Institute of Power Electronics.

关键词： pulse width modulation

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pulse width modulation to Control a Resonant Inverter

Pulse Width Modulation to Control a Resonant Inverter

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2023 Russian Workshop on Power Engineering and Automation of Metallurgy Industry: Research and Practice, PEAMI 2023

作者： Siraev, F. Khazieva, R. Ufa State Petroleum Technological University Ufa Russia

ISBN: (纸本)9798350322156

In this paper, a study was made of the control method for a resonant inverter with a multifunctional integral electromagnetic component (MIEC), which acts as an oscillatory circuit and at the same time a stabilizer. This makes it possible to improve the output parameters and the efficiency of electrical energy conversion. The main task is to obtain the results of computer simulation and their study. The authors developed a computer model in the Matlab environment and implemented pulse-width modulation (PWM) to control the output parameters of a resonant inverter based on MIEC. The effectiveness of this converter control method was also evaluated. The developed model provides the possibility of a deeper study of the characteristics of the system. The results confirm the improvement in the quality of the output parameters, the reduction of ripple. The range of regulation of the output voltage is increased due to the use of PWM, while maintaining high efficiency values. © 2023 IEEE.

关键词： pulse width modulation

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A Study of the Current Quality of a Network Inverter with Relay and pulse width modulation

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Russian Electrical Engineering 2024年第4期95卷 313-320页

作者： Kiselev, M.G. National Research University "Moscow Power Engineering Institute" Moscow111250 Russia

Abstract: The operation of a three-phase inverter with output network chokes (a network regulator) in the reactive power compensation mode is considered. The main attention is paid to the comparison of two fundamentally different control systems based on pulse-width modulation and relay modulation. A model of the network regulator is developed, on the basis of which the characteristics of the output current quality and switching losses are obtained depending on the modulation frequency (the width of the hysteresis loop). The operation of the network regulator with a relay digital control system is considered. © Allerton Press, Inc. 2024. ISSN 1068-3712, Russian Electrical Engineering, 2024, Vol. 95, No. 4, pp. 313–320. Allerton Press, Inc., 2024. Russian Text The Author(s), 2024, published in Elektrotekhnika, 2024, No. 4, pp. 63–70.

关键词： pulse width modulation

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Pneumatic Pressure Control Using on-off Valves with pulse width modulation

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CHEMICAL ENGINEERING & TECHNOLOGY 2023年第1期46卷 21-28页

作者： De Carvalho, Gabriel Bideaux, Eric Massioni, Paolo Sesmat, Sylvie Bristiel, Frederic Univ Claude Bernard Lyon 1 Univ Lyon INSA Lyon CNRSEcole Cent LyonUMR5005Ampere F-69621 Villeurbanne France Liebherr Aerosp Toulouse F-31016 Toulouse France

Servomotor-controlled valves are widely used in industry for pressure control of pneumatic systems. However, as a first stage, they can cause significant hysteresis that can result in loss of pressure or flow control accuracy at the second stage level. To reduce this effect and improve accuracy, a possible solution relies on the use of on-off switching valves controlled by pulse width modulation (PWM). This approach is studied, firstly by analytically determining how the PWM parameters have to be tuned according to the on-off valve characteristics, secondly by ensuring that these characteristics provide the desired behavior of the system, and finally by experimentally verifying whether the PWM control can successfully reduce hysteresis, without decreasing the application range.

关键词： Aeronautics Fluid power Pneumatic pressure control pulse width modulation

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Level vector pulse width modulation for multilevel inverters

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INTERNATIONAL JOURNAL OF CIRCUIT THEORY AND APPLICATIONS 2023年第12期51卷 5776-5796页

作者： Qanbari, Tohid Tousi, Behrouz Farhadi-Kangarlu, Mohammad Urmia Univ Fac Elect & Comp Engn Orumiyeh Iran

In this paper, a novel method named as level vector pulse width modulation (LVPWM) is proposed for multilevel inverters. Similar to the conventional space vector pulse width modulation (SVPWM), the proposed method is a vector-based method in the & alpha;-& beta;frame. Unlike the SVPWM, the variables of each of the & alpha;and & beta;axes are considered separately. Instead of space vectors, level vectors are considered for the synthesis of the reference vectors. There is no need to consider multiple switching states, vectors, and large lookup tables in the algorithm. The appropriate switching states for the synthesis of the reference vectors are determined using simple computations at each sampling time. Generality for different inverter topologies, online implementation, simplicity of the algorithm and computations, independency of the algorithm complexity from the number of switching states, and easy extension to overmodulation region are the advantages of the proposed method. Implementation of the LVPWM in different inverter topologies is studied. The validation of the proposed modulation strategy is carried out by simulation and experimental results.

关键词： inverter multilevel inverter overmodulation pulse width modulation space vector modulation

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An Active Rectifier With pulse width modulation (PWM) Mode On- and Off-Delay Compensation for Wireless Power Transfer (WPT) System

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IEEE ACCESS 2023年 11卷 118204-118216页

作者： Zheng, Kaishan Hou, Ying Wang, Xiaosong Liu, Yu Chinese Acad Sci Inst Microelect Res & Dev Ctr Healthcare Elect Beijing 100029 Peoples R China Univ Chinese Acad Sci Sch Microelect Beijing 101408 Peoples R China Chinese Inst Brain Res Beijing 102206 Peoples R China

In this article, an active rectifier with pulse width modulation (PWM) mode on- and off-delay compensation technique is proposed. Conventional delay compensation modes: current mode, voltage mode, and delay-based mode are discussed respectively. Also, the adaptive delay compensation technique and potential disturbance problems are analyzed. To achieve wide and flexible delay compensation range, the proposed rectifier adopts current mode delay compensation methods to eliminate on- and off-delay. Moreover, PWM mode feedback loops are built to compensate circuit delays adaptively under various process, voltage, and temperature (PVT) and loading conditions. Compared with previous works, the proposed PWM mode technique converts the fluctuant error voltages into the fixed duty cycle signal in each cycle, avoiding the disturbance on compensation current and even error flips of comparators. The stability of the current compensation is improved. The proposed active rectifier was designed and fabricated in $0.18\mu \text{m}$ CMOS process. Both TX and RX coils are designed and fabricated on printed circuit board (PCB), and the diameter is limited below 3cm. Measurement results show that, with the input sine voltage amplitude ranging from 1.5V to 2.4V and 2MHz operating frequency, the peak power conversion efficiency (PCE) achieves 91.7% under $200\Omega $ loading resistor and the peak voltage conversion ratio (VCR) achieves 93.7% with $500\Omega $ loading resistor. The maximum output power reaches 57.6 mW. Compared with the case with no PWM mode delay compensation, the measurement PCE and VCR are improved by at least 9%. The proposed rectifier achieves better dynamic performance and is suitable for wireless power transfer (WPT).

关键词： Delays pulse width modulation Voltage control Rectifiers Feedback loop Electric potential Threshold voltage Active rectifier delay compensation pulse width modulation (PWM) current mode compensation power conversion efficiency (PCE) voltage conversion ratio (VCR) wireless power transfer (WPT)

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Distributed Interval Consensus of Multiagent Systems With a pulse width modulation Protocol

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IEEE TRANSACTIONS ON AUTOMATIC CONTROL 2023年第3期68卷 1730-1737页

作者： Zou, Yao Xia, Kewei Zuo, Zongyu Ding, Zhengtao Univ Sci & Technol Beijing Inst Artificial Intelligence Beijing 100083 Peoples R China Univ Sci & Technol Beijing Sch Automat & Elect Engn Beijing 100083 Peoples R China Beijing Inst Technol Adv Res Inst Multidisciplinary Sci Beijing 100081 Peoples R China Beihang Univ BUAA Res Div 7 Beijing 100191 Peoples R China Univ Manchester Dept Elect & Elect Engn Manchester M13 9PL England

Rather than the conventional pure consensus, this article proposes a pulsewidth modulation (PWM) protocol for an improved interval consensus of multiagent systems from the distributed perspective. In particular, the consensus of all the agents is achieved within a prescribed interval, which is merely available to partial agents, though. The PWM protocol effectively relieves the running burden of the agents without the additional analogue-to-digital conversion. The modulation periods of different agents are allowed to be heterogeneous. By nominating the agents that have access to the given interval as leaders and others as followers, the proposed distributed PWM protocol introduces a projection operator for the leaders in order for the collective aggregation. In terms of the graph connectivity condition of containing a spanning tree, it is shown that the concerned interval consensus objective is realized by the proposed distributed PWM protocol. Simulations are eventually performed to validate the established theoretical results.

关键词： Protocols pulse width modulation Multi-agent systems Topology Switches Time-varying systems Stability criteria Distributed protocol interval consensus multiagent systems pulsewidth modulation (PWM)

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