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This paper proposes a Class D current-source resonant boost converter, which is controlled with the 1-bit delta-sigma modulator. The 1-bit delta-sigma modulator, which is an analog to digital (A/D) converter for digital audio amplifiers, generates a 1-bit (1/0) signal based on the input signal. This `periodical' output signal has an advantage in driving resonant converters. Class D voltage-source...
This paper presents a novel topology for the generation of adjustable frequency and magnitude PWM three phase ac from a balanced three phase ac source with a high frequency ac link. The proposed power electronic transformer system provides single stage power conversion with bidirectional power flow capability. This topology along with the proposed control has the following advantages : 1) Input power...
This paper presents the effects of information coding at the pulsating dc link on the performance of the high-frequency-link (HFL) inverter. The asymmetrical duty-cycle phase-shift modulation (resulting in pulse placement) of the front-end of the HFL inverter yields reduced frequency of the pulsating dc link voltage. It also results in reduced total harmonic distortion (THD) of the inverter output...
This paper presents an analysis of the protective snubber circuits in a high frequency transformer (HFT) linked three phase ac/ac power conversion system with reduced number of switches. This topology provides single stage power conversion with bidirectional power flow capability and input power factor correction. This topology is important because of reduced number of switches in the voltage source...
Circulating currents have been experimentally observed in pulse-width modulated ac open-end winding drives. These currents have the effect of increasing conduction losses in the stator winding resistance of the ac machine. Two major causes for these currents have been identified as device voltage drops in power semi-conductor devices and dead-time used for over-current protection. Analysis of these...
In high-power current-source inverter (CSI) fed drives, reduction of losses in semiconductor devices and dc-link inductor through the dc-link current minimization is one of the primary goals. In this paper, a control strategy for the high power CSI-fed interior permanent magnet (IPM) drive is proposed for this purpose. This control strategy keeps the dc-link current at minimum level without exceeding...
Controlling an ac machine without speed or position sensor at zero frequency requires the extraction of its inherent or engineered saliencies. This extraction is currently linked to injected high frequency or transient test signals that are superposed to the fundamental wave. These test signals also affect noise emission, maximum inverter output voltage, and switching frequency. Different methods...
This paper studies application of the particle swarm optimizer to finding suitable parameters for multi-objective problems in design of switching circuits. The problem is described by the hybrid fitness function consisting of analog objective functions of the parameters, criterion and digital logic. The hybrid fitness function permits increase of some fitness component(s) below the criterion and this...
An approach to adjust the feeding power to resistive electric heaters using zero-cross switching of the power line with delta-sigma modulator is proposed. The switch is on or off with a unit of a half cycle of the power line suppressing low frequency components of the load voltage to prevent the transformer saturation. To manage this constraint of the switching sequence, the pulse sequence for the...
This paper presents a field programmable gate array (FPGA) implementation of a digital circuit that measures in real-time the first harmonic load impedance of medium-frequency (25 kHz-70 kHz) induction heating cooking appliances. The load impedance of a planar inductor coupled to a pan depends on the geometry, pan material, temperature, and frequency. Real-time load measurement is desirable for a...
This paper proposes a high performance hybrid cascaded H-Bridge (HB) Multilevel Converter (MLC) with integrated Series Active Power Filter SAPF for interfacing energy storage systems with medium voltage grids. Isolated DC sources comprised of modular dual DC/DC converters and Medium Frequency Transformers MFT are used to energise the MLC HBs. The primary sides of the DC/DC converters are connected...
Among the mature multilevel converter topologies, cascade multilevel H-Bridge inverter is promising one which is an alternative for grid-connected photovoltaic/ wind-power generator, flexible alternating current systems and motor drive application. The CMC (cascade multilevel converter) can flexibly expand the output power capability and is favorable to develop. Present paper elevates a new structure...
Phase shifted carrier modulation has become an industry standard in its application to multi-level H-bridge Stat-Coms. The technique uses the cancellation of harmonics within each phase-leg to significantly improve the harmonic performance relative to the switching frequency. The purpose of this paper is to investigate whether the practical implementation of the technique deteriorates the harmonic...
This paper proposes a new fine servo system based on a new over-modulation method with priority given to d-axis voltage for interior permanent magnet synchronous motor (IPMSM). The proposed over-modulation method gives priority to the d-axis voltage to avoid the d-axis voltage saturation, and increases the amplitude of inverter output voltage to achieve the quick torque and speed responses under voltage...
The configuration of a single-phase AC-DC converter plus a three-phase inverter traction system has been widely applied in high-speed railway electrical drive systems. With the single-phase power feeder, the instantaneous power is fluctuating at twice of the power line frequency, and so is the DC-link voltage. Associated with the DC-link voltage fluctuation is a severe problem, when the electric frequency...
Open-end winding variable speed drives with dual-inverter supply have been extensively investigated for various applications, including series hybrid powertrains and propulsion motors. The topology is simple to realise while offering a higher number of switching states without the need for capacitor balancing algorithms, when compared to standard multilevel converters. The existing body of work is...
Hybrid control approach for pq instantaneous power theory applied to the 3-phase 4-wire active power filter is proposed. The control methods lead to a simple technique inherited from the conventional direct control method and offer a good dynamic response for active filtering in power system. With the goal to simplify the implementation, 2 methods- i.e. best vector selection and angle-based vector...
This paper presents an efficient Differential Evolution (DE) based solution for harmonic elimination pulse-width modulation (HEPWM). The aim is to solve for the set of transcendental equations that determine the switching angles of the HEPWM waveform. The objective function of the DE is designed to minimize (to near zero) the selected harmonics and at the same time allows for the fundamental component...
This paper explores the possibility of connecting two Wind Turbine Generators (WTG) to the grid using a single three level inverter. In the proposed system the rectified output of one WTG is connected across the upper dc-link capacitor of a standard diode clamped three level inverter. Similarly the rectified output of the other WTG is connected across the lower capacitor. This particular combination...
This paper explores a new breed of energy storage system interfacing for grid connected photovoltaic (PV) systems. The proposed system uses the popular dual inverter topology in which one inverter is supplied by a PV cell array and the other by a Battery Energy Storage System (BESS). The resulting conversion structure is controlled in a way that both demand matching and maximum power point tracking...
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