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Hybrid pulsewidth Modulated Single-Phase Quasi-Z-Source Grid-Tie Photovoltaic Power System

IEEE TRANSACTIONS ON INDUSTRIAL INFORMATICS 2016年第2期12卷 621-632页

作者： Liu, Yushan Ge, Baoming Abu-Rub, Haitham Sun, Hexu Texas A&M Univ Dept Elect & Comp Engn Doha 23874 Qatar Texas A&M Univ Dept Elect & Comp Engn College Stn TX 77843 USA Hebei Univ Sci & Technol Sch Elect Engn Shijiazhuang 050000 Peoples R China

A hybrid pulsewidth modulated single-phase quasi-Z-source grid-tie photovoltaic (PV) power system is proposed. The hybrid pulse-width modulation (HPWM) combines the pulse-width modulation (PWM) and the pulse-amplitude modulation (PAM). The PWM works when the ac output voltage is lower than the dc source voltage;otherwise, the PAM operates the single-phase quasi-Z-source inverter (qZSI). The HPWM leads to the reduction of power loss, and the quasi-Z-source capacitance and inductance. An effective control strategy is proposed for the new PV power system to manage the maximum power point tracking (MPPT) of PV panel, grid-tie power injection, and dc-link voltage. A grid-tie current controller, combining a repetitive controller and a proportional-resonant regulator, achieves strong harmonic suppression, fast dynamic, and zero tracking error. A 500-W prototype is built to verify the new system. Power loss estimation and impedance design are detailed. Experimental tests validate the HPWM, new PV power system with higher efficiency, and the related control method.

关键词： Photovoltaic power system pulse-width modulation quasi-Z-source inverter single-phase grid-tie control

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PID AND FUZZY CONTROLLING THREE PHASE ASYNCHRONOUS MACHINE BY LOW LEVEL DC SOURCE THREE PHASE INVERTER

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TEHNICKI VJESNIK-TECHNICAL GAZETTE 2016年第3期23卷 753-760页

作者： Can, Erol Sayan, H. Huseyin Erzincan Univ Vocat High Sch Elect & Automat Dept Erzincan Turkey Gazi Univ Fac Technol Dept Elect & Elect Engn Ankara Turkey

In this study, a three-phase asynchronous motor driven by a broad-based system is described. So, mathematical model of converter, sinus pulse width modulation for the three phase inverter, and mathematical model of three-phase asynchronous motor have to be utilized in order to establish the system. After creating such a system, Fuzzy Logic and PID controllers are focused in order to get satisfactory results which are short settling time of rotor speed, low harmonic and short settling time of high phase current. Created mathematical models are run at the MATLAB Simulink. Direct voltage is applied to converter input. This voltage is represented by a renewable energy source that could be obtained from solar energy source. The direct voltage is lower than the peak of the alternating voltage. The alternating voltage is obtained from output of the inverter to drive the induction motor. Firstly, resistive (R) and inductive (L) loads are driven. Secondly, three-phase asynchronous motor (ASM) is driven with the low direct voltage. After that, simulation results are given in order to demonstrate performance and effectiveness of the proposed system.

关键词： Fuzzy Logic inverter microcontroller PID (proportional-integral-derivative) pulse-width modulation

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Torque ripple reduction of switched reluctance motor using fuzzy control

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ENGINEERING COMPUTATIONS 2016年第6期33卷 1668-1679页

作者： Wang, Ming-Shyan Chen, Seng-Chi Fang, Wei-Chin Chuang, Po-Hsiang Southern Taiwan Univ Sci & Technol Dept Elect Engn Tainan Taiwan

Purpose - Extensive efforts have been conducted on the improvement of torque ripple in switched reluctance motor (SRM) drive. The purpose of this paper is to estimate initial on time of pulse-width modulation (PWM) and turn-off angle using the motor speed and rotor angle by fuzzy logic. Design/methodology/approach - A fuzzy logic control together with the PWM technique and turn-off angle are used to improve torque ripple and dynamic response. Findings - After determining initial on time of PWM, the rise slope of phase current is increased. Research limitations/implications - Future work will consider to increase the complex of the fuzzy control to adaptively tune parameters and achieve excellent results. Practical implications - The experimental results of the proposed method are presented to show the effectiveness. Originality/value - This paper achieves SRM control by one special PWM technique which is seldom studied.

关键词： Fuzzy logic control pulse-width modulation Switched reluctance motor

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A GENERAL INTEGRAL QUADRATIC CONSTRAINTS THEOREM WITH APPLICATIONS TO A CLASS OF SAMPLED-DATA SYSTEMS

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SIAM JOURNAL ON CONTROL AND OPTIMIZATION 2016年第3期54卷 1105-1125页

作者： Fetzer, M. Scherer, C. W. Univ Stuttgart Dept Math D-70049 Stuttgart Germany

In the framework of integral quadratic constraints a more general stability theorem is derived by relaxing the assumptions on the uncertainty. In contrast to existing results, input-output relations are only required to hold on a subspace of the full signal space. This result is employed to incorporate uncertainties exhibiting sampling behavior into the framework of integral quadratic constraints. The arising infinite dimensional stability test is exactly reduced to a finite dimensional linear matrix inequality. Advantages of this approach are illustrated for the specific case of an interconnection including a pulse-width modulator.

关键词： integral quadratic constraints pulse-width modulation linear matrix inequalities

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Three-Phase Split-Source Inverter (SSI): Analysis and modulation

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IEEE TRANSACTIONS ON POWER ELECTRONICS 2016年第11期31卷 7451-7461页

作者： Abdelhakim, Ahmed Mattavelli, Paolo Spiazzi, Giorgio Univ Padua Dept Management & Engn I-36100 Vicenza Italy Univ Padua Dept Informat Engn I-35131 Padua Italy

In several electrical dc-ac power conversions, the ac output voltage is higher than the input voltage. If a voltage-source inverter (VSI) is used, then an additional dc-dc boosting stage is required to overcome the step-down VSI limitations. Recently, several impedance source converters are gaining higher attentions [1], [2], as they are able to provide buck-boost capability in a single conversion stage. This paper proposes the merging of the boost stage and the VSI stage in a single stage dc-ac power conversion, denoted as split-source inverter (SSI). The proposed topology requires the same number of active switches of the VSI, three additional diodes, and the same eight states of a conventional space-vector modulation. It also shows some merits compared to Z-source inverters, especially in terms of reduced switch voltage stress for voltage gains higher than 1.15. This paper presents the analysis of the SSI and compares different modulation schemes. Moreover, it presents a modified modulation scheme to eliminate the low frequency ripple in the input current and the voltage across the inverter bridge. The proposed analysis has been verified by simulation and experimental results on a 2.0-kW prototype.

关键词： DC-AC pulse-width modulation single-stage space vector split-source inverter voltage-source inverter (SSI) Z-source inverter (ZSI)

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On Improving Phase-Shifted PWM for Flying Capacitor Multilevel Converters

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IEEE TRANSACTIONS ON POWER ELECTRONICS 2016年第8期31卷 5384-5388页

作者： Ghias, Amer M. Y. M. Pou, Josep Jose Capella, Gabriel Acuna, Pablo Agelidis, Vassilios G. Univ Sharjah Dept Elect & Comp Engn Sharjah U Arab Emirates Univ New S Wales Australian Energy Res Inst Sydney NSW 2052 Australia Univ New S Wales Sch Elect Engn & Telecommun Sydney NSW 2052 Australia Tech Univ Catalonia Dept Elect Engn Terrassa 08222 Spain

This letter proposes a phase-shifted pulse-width modulation (PS-PWM) technique for the flying capacitor (FC) multilevel converter that improves the quality of the line-to-line voltages. In traditional PS-PWM, the line-to-line voltages include intervals that switch between nonadjacent voltage levels, which deteriorates the harmonic performance. The proposed PS-PWM constantly achieves line-to-line voltages with switching transitions between two adjacent levels. The proposed modulation technique is implemented using two sets of n evenly phase-shifted carriers that are alternatively applied depending on the instantaneous value of the reference signal of each phase-leg. Furthermore, it can be implemented in FC multilevel converters with any number of levels while maintaining natural capacitor voltage balance. Experimental results from a four-level FC converter prototype are presented.

关键词： Multilevel converter power electronics pulse-width modulation

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Harmonic Optimization in Voltage Source Inverter for PV Application using Heuristic Algorithms

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INTERNATIONAL JOURNAL OF EMERGING ELECTRIC POWER SYSTEMS 2016年第6期17卷 671-682页

作者： Kandil, Shaimaa A. Ali, A. A. El Samahy, Adel Wasfi, Sherif M. Malik, O. P. Helwan Univ Dept Elect Machine & Power Engn Fac Engn Cairo Egypt Univ Calgary Dept Elect & Comp Engn 2500 Univ Dr NW Calgary AB T2N 1N4 Canada

Selective Harmonic Elimination (SHE) technique is the fundamental switching frequency scheme that is used to eliminate specific order harmonics. Its application to minimize low order harmonics in a three level inverter is proposed in this paper. The modulation strategy used here is SHEPWM and the nonlinear equations, that characterize the low order harmonics, are solved using Harmony Search Algorithm (HSA) to obtain the optimal switching angles that minimize the required harmonics and maintain the fundamental at the desired value. Total Harmonic Distortion (THD) of the output voltage is minimized maintaining selected harmonics within allowable limits. A comparison has been drawn between HSA, Genetic Algorithm (GA) and Newton Raphson (NR) technique using MATLAB software to determine the effectiveness of getting optimized switching angles.

关键词： harmony search algorithm selective harmonic elimination pulse-width modulation three level inverter

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High-efficiency and low-consumption underwater sonar transmitter with improved triple-pulse HP-PWM signal model based on class D amplifier

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EURASIP JOURNAL ON WIRELESS COMMUNICATIONS AND NETWORKING 2016年第1期2016卷 1页

作者： Li, Yanchao Duan, Fajie Jiang, Jiajia Wang, Xianquan Tianjin Univ State Key Lab Precis Measuring Technol & Instrume Tianjin 300072 Peoples R China

An improved triple-pulse high-power pulse-width modulation (HP-PWM) signal model is proposed to enhance the performance of current underwater sonar transmitter. The presented model is based on reducing the third and fifth harmonic energy of the HP-PWM signal. The achievement of low-power consumption has been implemented using class D amplifier and high-quality factor (High-Q) underwater acoustic transducer (UAT). High efficiency is demonstrated by simulations (reducing 41 % of the third and fifth harmonic energy). Feasibility of the presented model under different conditions has been proved by experiments.

关键词： Audio frequency power amplifiers pulse-width modulation Continuous wave Class D amplifier

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Characteristics Analysis and Performance Evaluation of PWM-Throttled Hydrogen Peroxide Monopropellant Thruster

Characteristics Analysis and Performance Evaluation of PWM-T...

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2017国际航空科学青年学者学术会议

作者： Sukmin Choi Sangwoo Jung Sejin Kwon

pulse-width modulation is one of the methods of thrust throttling which utilizes a continuous open/close operation of a solenoid valve with modulated electric signal. Average flow rate of the propellant is controlled by varying a duty cycle of a valve input signal. In this paper, characteristics and performance of a green monopropellant thruster under a PWM throttling operation were analyzed and evaluated. 50 N-scale monopropellant thruster using Hydrogen Peroxide propellant was designed and fabricated for the experiment. Results of a firing tests shows that the thruster linearly throttled the thrust with respect to duty cycle variation, however, accompanied high pressure instability and pressure spikes within the catalyst bed and the chamber.

关键词： Monopropellant thruster Hydrogen Peroxide Throttling pulse-width modulation

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A Novel Five-level Optimized Carrier Multilevel PWM Quad-Inverter Six-Phase AC Drive 17

A Novel Five-level Optimized Carrier Multilevel PWM Quad-Inv...

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17th IEEE International Power Electronics and Motion Control Conference (PEMC)

作者： Sanjeevikumar, P. Blaabjerg, F. Wheeler, Pat Fedak, V. Duran, M. J. Siano, P. Univ Johannesburg Dept Elect & Elect Engn Auckland Pk South Africa Aalborg Univ Ctr Reliable Power Elect CORPE Dept Energy Technol Aalborg Denmark Univ Nottingham Dept Elect & Elect Engn Power Elect Machines & Control PEMC Grp Nottingham NG7 2RD England Tech Univ Kosice Dept Elect Engn & Mech Kosice Slovakia Univ Malaga Dept Elect Engn Malaga Spain Univ Salerno Dept Ind Engn Campus Fis Salerno Italy

ISBN: (纸本)9781509017980

A novel single carrier pulse-width modulation (PWM) for a new quad-inverter configuration for multilevel six-phase asymmetrical open-winding ac converter is proposed in this article. Modularity of the circuit consist of four standard two-level voltage source inverters (VSIs) with slight modifications, i.e. one additional bi-direction switch (MOSFET/IGBT) in each phase and a link to neutral with two capacitors to generate increased output levels. Furthermore, original optimal single carrier zero-shifted five-level modulation (SCZSFM) algorithm is developed for each VSI to behave as equivalent to ones, a classical five-level multilevel inverter. Moreover, feasibility of the topology allows the VSIs to provide multilevel output voltage regardless of the open-winding electrical machine configuration. Also, the developed single carrier based PWM presents a straightforward solution compared to space vector modulation approaches for real time implementation. The total electric power shared among the four dc buses and quadruples the power capability of VSIs. Complete ac drive modules are developed numerically using simulation in MATLAB/PLECS software. Observed set of results are depicted in this paper under balanced conditions to show the effectiveness of the proposal in good agreement with theoretical background. This proposal suits the need of low-voltage/high-current applications to ac tractions, electrical vehicles and `More-Electric Aircraft' propulsion systems.

关键词： Dual three-phase inverter quad-inverter six-phase inverter multilevel inverters multiphase drives asymmetrical inverters multiple space vectors pulse-width modulation

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