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This paper studies the performance of the dual 3-level T-type converter topology, as an advanced 5-level converter, applied to an open-ends induction machine. The performance is evaluated based on harmonic analysis, converter power loss and the steady-state machine performance. An advanced technique based on space-vector pulse-width modulation is proposed to reduce the converter switching stress as...
A voltage-controlled oscillator (VCO) with low phase noise and low power dissipation for sub-harmonic mixing is proposed. A cross-coupled negativeresistance circuit with nMOS transistors in the feedback is adopted to suppress high-order harmonics. According to this proposed structure, low phase noise can be achieved under low power dissipation. The VCO chip including a cross-coupled differential buffers...
This paper presents a high resolution approach based on wavelet transform (WT) for measurement of single phase power quantities defined in IEEE STD 1459-2010 specially in case of non-sinusoidal conditions of voltage and current waveforms. The proposed approach is divided into two stages, firstly using the advantage of discrete wavelet transform (DWT) in order to calculate the phasors (magnitude and...
This paper presents a high resolution approach based on wavelet transform (WT) for measurement three phase power quantities defined in IEEE STD 1459-2010 specially in case of non-sinusoidal and unbalanced three phase power systems. The proposed approach is divided into two stages. Firstly using the advantage of discrete wavelet transform (DWT) in order to calculate the phasors (magnitude and phase...
This paper presents a scheme for controlling the flow of current from a grid connected photovoltaic (PV) generator while supplying power to the utility grid. The proposed system utilizes a fuzzy logic controller (FLC) to control the injected current through the PV inverter switches. The controller employs error and change of error in current as inputs. In the design, asymmetrical triangular membership...
This paper introduces an optimal power filter design method to compensate simultaneously current harmonics and reactive power of a nonlinear load. The power filter consists of a passive RL low-pass filter placed in series with the load and a pure active power filter which has RL elements connected in series with an insulated gate bipolar transistors (IGBTs) based voltage source converter. The filter...
This paper presents a fuzzy logic controlled shunt active power filter used to compensate harmonic distortion and increase power factor to produce a high power quality in three-phase systems, using MATLAB and its tools Simulink and Power System Blockset. Fuzzy logic (FL) and optimized fuzzy logic with Gravitational Search Algorithm (GSA-FL) was used to control shunt active power filter. The results...
This paper is concerned with harmonic impact of different types of distributed generation (DG) units in low voltage distribution systems. This study considers the impact of three types of DG units connected to a power system, a mini hydro synchronous generator, photovoltaic system and double fed induction generator wind turbine. The DG units are modelled using the PSCAD/EMTDC program and simulations...
This paper presents a new technique for identifying the locations of multiple harmonic sources in a distribution system using independent component analysis and mutual information theory. Independent component analysis is applied for estimating the current profile of injected harmonic currents caused by the harmonic sources, while the mutual information theory is for estimating the location of harmonic...
Voltage sag and swell are the common problem for sensitive load. The impact range from load disruptions to substantial economic losses. The DVR is the best solution to protect the sensitive loads. This paper present a fast DVR with controller to compensate the short outage, reduced the harmonic distortion and transient voltage for balanced and unbalanced load. In-phase method with continues two vector...
This paper presents a novel method for determining the contribution of harmonic distortion generated by utility and customer in a distribution system. The method considers modeling the customer side in terms of RLC components and the whole system is represented by a Norton equivalent circuit. Voltage and current at the point of common coupling are then measured to calculate the customer and utility...
We describe an approach for harmonic surface mapping of blood vessel aneurysms into a topologically equivalent canonical space. We use this approach to map and visualize local hemodynamic variables associated with the surface of sidewall internal carotid artery aneurysms (ICA) imaged by 3D X-ray angiography. These variables are derived from steady-state computational fluid dynamic simulations. An...
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