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Showing 1 to 14 of 14 for “"PWM techniques"”.
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Three-phase power conversion using soft-switching PWM techniques
… issues related to high-frequency soft-switching PWM three-phase power converters. These are: 1. Analysis, synthesis, and design of three-phase soft-switching PWM power converter topologies 2. Design of input EMI filters for three-phase converters 3. Design of microprocessor controllers for …
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Space Vector Pwm Techniques for Six_Phase Three-Level Inverter-Fed Drives
… This thesis presents pulse width modulation techniques for two- and three-level asymmetrical and symmetrical six-phase drives with a single or two isolated neutral points configuration. However, since the modulation techniques for the drives with two isolated neutral points are based on the …
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PWM Techniques for Control of Dual-Inverter Supplied Six-Phase Drives
… non-equidistant.In this thesis, modulation techniques for both symmetrical and asymmetrical six-phase machines are investigated. The machines are configured in open-end winding configuration where both ends of the stator winding are connected to separate isolated inverters in a topology …
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Development of control techniques for direct AC‐AC matrix converter fed multiphase multi‐motor drive system
… converter. This thesis explores the control techniques of multi‐phase direct AC‐AC converter for such specific series and parallel‐connected multi‐phase motor drives. The research presented here utilises additional degrees of freedom available in a multi‐phase system to control a number of …
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Highly Efficient Gan-Based Single-Phase Transformer-Less Pv Grid-Tied Inverter
… inverter with reactive power control. Existing PWM techniques cannot provide a freewheeling path in the negative power region to generate reactive power in a single-phase transformer-less inverter. Thus, a new PWM technique is proposed to provide new modes of operation to achieve reactive power …
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Soft-switching techniques for pulse-width-modulated converters
… concept of soft-switching pulse-width-modulated (PWM) technique was proposed aimed at combining the advantages of both the conventional PWM technique and the resonant technique. This work presents four new families of soft-switching PWM converters: the zero-voltage-switched (ZVS) PWM converters, …
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Switching frequency reduction in pulse-width modulated multilever converters and systems
… Along with proper Pulse-Width Modulation (PWM) control scheme, they can also provide lower cost, higher performance, lower Electro-Magnetic Interference (EMI), and higher efficiency than the traditional PWM converters. However, switching losses become a serious issue in high power …
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Multilevel inverters for renewable energy systems
… compares four different pulse width modulation (pwm) techniques that are often used in MLI under consideration: three, five, seven and nine level inverters. Harmonic content of the output voltage is recorded across a range of modulation indices for each of the three popular topologies in …
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Improved Resonant Converters with a Novel Control Strategy for High-Voltage Pulsed Power Supplies
… high efficiency. In this thesis, topologies and techniques are investigated to meet and exceed these challenges. Non-isolation type topologies have been used for this application. Due to the high voltage stress of the output, non-isolation topologies will suffer severe loss problems. Extremely …
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Integration of energy storage components with cascaded H-bridge multilevel converters
… frequency and the auxiliary cells run at the PWM frequency. Finally, the sigma-delta modulation method has been utilized to extend the capacitor voltage regulation range. This method benefits from simplicity in implementation in comparison to PWM techniques. The analytical and simulation …
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Harmonic Reduction IN a Single-Switch Three-Phase Boost Rectifier With Harmonic-Injected PWM
… with the sixth-order harmonic injection PWM concept is established, and a sixth-order harmonic injection technique is developed for the harmonic reduction of a single-switch three-phase boost rectifier. The approach employs a constant duty cycle with sixth-order harmonic injection to …
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Implementation of a Digital Signal Processor (DSP) Based Space Vector Control of AC Induction Motor Drives
… synthesize sine waves. AC waveform generation techniques such as the square wave and Pulse Width Modulation (PWM) are compared in terms of their harmonic elimination capability and fundamental gain control. Various PWM techniques such as bipolar switching, unipolar switching, selective harmonic …
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Cascade Dual-Buck Inverters for Renewable Energy and Distributed Generation
… An asymmetrical half-cycle unipolar (AHCU) PWM technique is proposed for dual-buck full-bridge inverter. The proposed approach is to cut down the switching loss of power MOSFETs by half. At the same time, this AHCU PWM leads to current ripple reduction, and thus reducing ripple-related loss …
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Design of High-Density Filter Building Blocks for SiC-based Three-Phase Power Converters
… motor drive for aircraft propulsion systems. Techniques, such as optimized parallel RC dampers to reduce the peak bearing current and CM/DM magnetic integration of a DC side filter with an embedded DC current sensor and embedded decoupling path with gate driver for high frequency commutation, …