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检索条件"主题词=Pulse width Modulation"

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A novel approach of torque ripple estimation by inverter generated current slope evaluation in interior permanent magnet synchronous machines

A novel approach of torque ripple estimation by inverter gen...

引用

European Conference on Power Electronics and Applications

作者： Jan Philipp Degel Stefan Hähnlein Christian Klöffer Martin Doppelbauer Karlsruher Institut für Technologie (KIT) / Elektrotechnisches Institut (ETI) Karlsruhe

The following work describes a new method for estimating the torque ripples of an interior permanent magnet synchronous machine (IPMSM) by estimating the machine parameters within one PWM cycle using the current slopes caused by the switching of the inverter. The use of test signals and filter-based approaches is avoided. In the first paragraph the state-of-the-art torque estimation algorithms are presented and the difference to the new method explained. Following, the theory of the torque equation is derived and the solution of this equation under the consideration of the different switching states of the inverter is investigated. Finally, all presented theoretical results are validated with measurement results on the test bench.

关键词： Permanent magnet machines Torque Magnetic separation Europe Estimation Switches pulse width modulation

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Application of PWM Control Technology in Photovoltaic Inverter Circuit

Application of PWM Control Technology in Photovoltaic Invert...

引用

International Conference on Applied Machine Learning (ICAML)

作者： Wei Cuihua Guangdong University of Science & Technology Dongguan China

ISBN: (纸本)9781665421263

The key technology of photovoltaic inverter circuit research is the application of PWM control technology. According to the characteristics of photovoltaic inverter circuit, the key is to choose the appropriate circuit, and the on-off of the switching device in the inverter circuit. According to the concept of PWM, control method and modulation method, SPWM technology is selected for research. The modulation method applied in the photovoltaic inverter circuit is compared and analyzed, using the trapezoidal wave and the triangular wave comparison method. In this method, a trapezoidal wave is used as a modulation signal, a triangular wave is used as a carrier wave, and the amplitudes of the two waves are equalized, and the on-off of the switching device is controlled at the moment of intersection of the two waves to realize PWM control.

关键词： Photovoltaic systems Process control Switches Machine learning pulse width modulation Control systems Inverters

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A High Efficiency Fast Transient Zero Output Ripple Buck Converter Using Split PWM Controller with Inductor Mismatch Compensation

A High Efficiency Fast Transient Zero Output Ripple Buck Con...

引用

IEEE International Symposium on Circuits and Systems

作者： Sivasai Guddanti Qadeer A. Khan Department of Electrical Engineering Indian Institute of Technology Madras Chennai INDIA

This paper proposes a zero output ripple buck converter for low noise applications. Unlike the conventional zero ripple converter which requires perfectly matched inductors, the proposed converter uses a novel inductor mismatch compensation technique to achieve perfect ripple cancellation. In order to prevent the loop instability due to inversion of PWM signal in the ripple cancellation path, a split PWM controller is used. Implemented in 180nm CMOS process, the proposed converter achieves simulated output ripple of less than 300μV for the entire range of duty cycle (0 to 100%) with peak efficiency of 93.5% for the load current of 0.1-1A at 2.5MHz switching frequency. An undershoot/overshoot of 86mV/56mV with settling time of less than 3.5μS was achieved when a load step of 0.5A/50ns is applied at the output.

关键词： Buck converters Switching frequency pulse width modulation CMOS process Inductors Voltage control Transient analysis

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A Generalized Technique to Eliminate DC Bias Imbalance in Primary and Secondary Currents of HF Transformer during Power Reference Mutation Event

A Generalized Technique to Eliminate DC Bias Imbalance in Pr...

引用

Smart Technologies for Power, Energy and Control (STPEC), IEEE International Conference on

作者： Saran Chaurasiya Bhim Singh IIT Delhi New Delhi India

ISBN: (纸本)9781665443203

DC bias in primary and secondary windings of HF isolation transformer is a common phenomenon. The power reference change makes corresponding phase shift change as per the control used for DAB DC-DC converter. This phase shift change makes transfer inductance current to increase or decrease exponentially, creates DC bias. This is due to volt-second imbalance during transient event. This causes saturation of HF isolation transformer and continuous oscillation in currents due to amplitude variation in input or output DC link voltage. During power reference increment or decrement, it is more dangerous for both active and passive components in system due to overheating of each of them and reduces the reliability of overall system. This paper focuses on the development of a generalized technique for DC bias elimination with no extra mathematical calculation burden on microcontroller and additional sensing requirements. The technique is developed for all phase shift power control techniques used for DAB. The technique is based upon additional phase shift increment or decrement during transient event. It is designed and simulated on the basis of digital development concept used in DSP micro-controller for PWM generation. A number of results with its implementation are shown for both DPS and TPS control techniques. Comparison among both shows the effectiveness of control technique with no DC bias during transient event. Results show the effectiveness of the control in terms of DC bias elimination in less than half switching time duration or less.

关键词： Windings Power control Hafnium Switches pulse width modulation Sensors Circuit faults

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A convex relaxation approach for the optimized pulse pattern problem

A convex relaxation approach for the optimized pulse pattern...

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European Control Conference (ECC)

作者： Lukas Wachter Orcun Karaca Georgios Darivianakis Themistoklis Charalambous Aalto University Espoo Finland ETH Zürich Switzerland ABB Corporate Research Center Baden Switzerland

Optimized pulse Patterns (OPPs) are gaining increasing popularity in the power electronics community over the well-studied pulse width modulation due to their inherent ability to provide the switching instances that optimize current harmonic distortions. In particular, the OPP problem minimizes current harmonic distortions under a cardinality constraint on the number of switching instances per fundamental wave period. The OPP problem is, however, non-convex involving both polynomials and trigonometric functions. In the existing literature, the OPP problem is solved using off-the-shelf solvers with local convergence guarantees. To obtain guarantees of global optimality, we employ and extend techniques from polynomial optimization literature and provide a solution with a global convergence guarantee. Specifically, we propose a polynomial approximation to the OPP problem to then utilize well-studied globally convergent convex relaxation hierarchies, namely, semi-definite programming and relative entropy relaxations. The resulting hierarchy is proven to converge to the global optimal solution. Our method exhibits a strong performance for OPP problems up to 50 switching instances per quarter wave.

关键词： Europe Switches pulse width modulation Programming Approximation error Power electronics Entropy

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Advanced Level Shifted Carrier Based Bus Clamping PWM Technique for a 54 pulse AC to DC Converter Fed MLI Based Induction Motor Drive

Advanced Level Shifted Carrier Based Bus Clamping PWM Techni...

引用

International Conference on Computing, Communication & Automation (ICCCA)

作者： Shuvra Prokash Biswas Safa Haq Md. Rabiul Islam Md. Kamal Hosain Rabindra Nath Shaw Rajshahi University of Engineering and Technology Rajshahi Bangladesh Faculty of Engineering and Information Sciences University of Wollongong New South Wales Australia Electronics & Communication Engineering Galotias University Uttar Pradesh India

ISBN: (纸本)9781665447539

Power quality improvement at both grid and motor ends is always an industrial concern for multilevel inverter (MLI) fed induction motor drives. The power quality of an induction motor drive (IMD) is vehemently influenced by the pulse width modulation (PWM) technique of the drive systems. The conventional triangle carrier based level shifted (LS) space vector PWM (LS-CSVPWM) technique provides less power quality problems than the LS sinusoidal PWM (LS-SPWM). In this paper, an advanced LS carrier based bus-clamping PWM (ALS-BCPWM) technique is proposed to mitigate the power quality problems of the IMD systems. The proposed technique utilizes center-aligned harmonic injected saturation LS sinusoidal carriers. In this paper, a 54-pulse AC-DC converter is utilized to feed a 7-level (7L) cascaded H-bridge (CHB) inverter based IMD. The proposed ALS-BCPWM technique employed in CHB inverter's switching reduces the total harmonic distortion (THD) of grid current, stator voltage, stator current, inverter switching and conductor power losses, and torque ripple of the IMD. The performance of the proposed ALS-BCPWM technique for IMD is verified in the MATLAB/Simulink environment and through some preliminary experimental tests.

关键词： Induction motor drives Total harmonic distortion Power quality Switches Voltage pulse width modulation Stators

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0Voltage Oriented Control Strategy of Three Phase PWM Rectifier in Future-oriented Smart Charging Stations

0Voltage Oriented Control Strategy of Three Phase PWM Rectif...

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Sustainable Power and Energy Conference (iSPEC)

作者： Xiang Muchao Ling Zaixun Liu Manjia Cui Yibo Jin Chen Energy and internet technology center State grid hubei electric power research institute Wuhan China

ISBN: (纸本)9781665414401

The three-phase PWM rectifier is used in the future-oriented smart charging station to realize the bidirectional power flow and the suppression of harmonics injected into the grid. In order to improve the steady-state and dynamic performance of the three-phase PWM rectifier, this paper proposes a voltage-oriented control strategy. First, the basic principle of the three-phase PWM rectifier is analyzed, and its mathematical model in the abc and dq coordinate system is established. On this basis, a three-phase PWM rectifier control strategy based on grid voltage orientation is proposed, the dual closed-loop control the system is analyzed and the controller parameters are designed. Finally, the correctness of the analysis and the effectiveness of the proposed control strategy are verified through the steady-state and dynamic experiments.

关键词： Regulators Rectifiers Switches pulse width modulation Power system harmonics Control systems Real-time systems

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Anti-Collision Car System using Fuzzy Logic Technique

Anti-Collision Car System using Fuzzy Logic Technique

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IEEE International Conference on Consumer Electronics (ICCE)

作者： Chiau Choon Jiat Zarina Tukiran Hazwaj Mohd Poad Abd Kadir Mahamad Sharifah Saon Shingo Yamaguchi Mohd Anuaruddin Ahmadon Faculty of Electrical and Electronic Engineering Universiti Tun Hussein Onn Malaysia Batu Pahat Johor Malaysia Graduate School of Science and Technology for Innovation Yamaguchi University Japan

This work proposed to design anti-collision car system that could predict the collision using fuzzy logic, controlled by PIC16F877A with pulse width modulation (PWM) technique. The ultrasonic sensor and humidity sensor are used to measure the distance and detect the relative humidity (RH) of the road condition. PWM duty ratio of a moving and stop condition of the vehicle are indicated with a value of > 70% and <; 40%, respectively. For a dangerous situation, the DC motor is turned off and the LED display is turned on as a warning to the driver.

关键词： Fuzzy logic Ultrasonic variables measurement Roads Decision making Humidity pulse width modulation Automobiles

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Design of DC motor operation monitoring system based on Matlab GUI

Design of DC motor operation monitoring system based on Matl...

引用

IEEE Advanced Information Technology, Electronic and Automation Control Conference (IAEAC)

作者： Fei Liu Xiao ming Dajun Lei Xiangyan He School of Electronic Information and Electrical Engineering Xiangnan University Chenzhou PR China Gospell Digital technology Co. Ltd Chenzhou PR China

ISBN: (数字)9781728180281

ISBN: (纸本)9781728180298

As an indispensable part of life and industry, DC motor has higher and higher requirements for its operation. If the monitoring interface is used to display and control the speed of DC motor to meet the functional requirements of different environments, the complex links of field monitoring and control can be greatly simplified. Therefore, DC motor operation monitoring system is designed in this paper. The system is mainly composed of two parts: upper computer system and lower computer system. The upper computer is based on the GUI motor operation monitoring system, which can display the motor voltage, current, speed and waveform in real time on the interface. At the same time, the upper computer software can realize the PID control function of the motor speed. The lower computer uses STM32 single-chip microcomputer minimum system, which is used to collect the motor speed, DC motor terminal voltage, and receive the upper computer speed information and generate the corresponding duty cycle PWM signal to speed the motor. Experiments show that the system can directly modify PID parameters through GUI interface to adapt to different motor speed regulation. At the same time, the system has stable operation, friendly human-machine interface, simple and convenient operation. The design of the whole system has certain practical significance for the fields of automatic control and electric drive.

关键词： pulse width modulation DC motors Real-time systems Software Regulation Monitoring Graphical user interfaces

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An Investigation on Torque Control Strategies for Switched Reluctance Motor

An Investigation on Torque Control Strategies for Switched R...

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International Conference on Electrical, Electronics, Communication, Computer and Optimization Techniques (ICEECCOT)

作者： Basavaraju S. Hadapad Raghuram L. Naik Basaveshwar Engineering College (A) Bagalkot India

ISBN: (纸本)9781665432733

The torque ripple is owing to inherent non-linear characteristics of switched reluctance motor (SRM). It leads to the noise and vibration that limits the adoption of SRM in industrial and automotive applications. Numerous control strategies found in literature to cut down the torque ripple of SRM. This research focuses on an extensive survey on direct and indirect torque control algorithms. Direct torque control algorithms consists of direct instantaneous torque control (DITC) which is implemented with hysteresis and PWM based controller. While, indirect torque control is implemented by instantaneous torque control (ITC) and average torque control (ATC). It is observed from the survey that, in hysteresis based DITC, hysteresis band is designed to limit torque ripple which increases the switching losses due to high switching frequencies whereas, PWM based algorithms have constant switching frequencies but limited to low speed operating range. It also observed from study that, ITC is suitable for lower operating speed if back-EMF is less than dc link voltage and ATC is appropriate for complete operating speed range. Finally, critical comparison in terms of operating range, switching frequency, torque per ampere ratio and current control of these algorithms are presented. Outcome of this study helps the researcher in making the judicious choice for selection of appropriate algorithm for mitigation of torque ripple of SRM employed in various applications.

关键词： Torque Switching frequency Torque control Switching loss Hysteresis motors pulse width modulation Switched reluctance motors

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