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The work suggests a space vector modulated direct torque control method to suppress the harmonic spikes. The control circuit of the presented drive utilizes a three phase five-level (5-level) inverter and an induction motor configured in open-end winding (OEW) topology. The 5-level inverter is realized using two 3-level inverters and each one is connected to two open ends of an induction motor (IM)...
In this paper, direct torque control scheme using space vector approach is implemented on an open-end winding induction motor. The three-level inverter is used to drive the motor by feeding two two-level inverter from both open ends of the motor. A three-level inverter drive will provide more number of voltage space vectors, thereby reducing the torque ripple compared to a two-level DTC scheme. The...
This work deals with vector control applied to the three phase induction motor (IM), using the indirect field oriented control (IFOC) technique. In the proposed topology, sliding mode controller with chattering reduction is applied, aiming high dynamic performance in a wide speed range and robust to load disturbances. Therefore, an approach with soft switching hyperbolic tangent function on the controllers...
This paper presents a method based on the wavelet package decomposition (WPD) for condition monitoring of the permanent magnet synchronous motor controlled by sensorless control algorithm. In the proposed method, the wavelet package is used to decompose the frequency spectrum of the motor current. The measured motor current, contains the harmonic created by high frequency voltage injection plus the...
In this paper a Random Pulse Width Modulation (RPWM) scheme for a dual inverter fed 3-level open-end winding induction motor based drive is presented. The proposed scheme is a variable switching frequency technique in which randomization is achieved by sampling the reference space vector at random intervals. Any reference space vector for the 3-level inverter is mapped into a vector of a basic 2-level...
A Pulse Density Modulation scheme based on Space Vector with Vector Quantization for four level inverter is proposed in this paper. The scheme disperses the power spectrum of the inverter output voltage as a wide-spectrum noise. The vector space of inverter reference space vector region is divided into voronoi regions to find out switching vectors. A new method is presented to code these voronoi regions...
A Spread Spectrum Modulation scheme based on Space Vector for three level inverter is proposed in this paper. The scheme disperses the power spectrum of the inverter output voltage as a wide-spectrum noise. The vector space of inverter reference space vector region is divided into voronoi regions to find out switching vectors. A new method is presented to code these voronoi regions with Vector Quantization...
This paper presents a new speed controller based on the theory of adaptive fuzzy inference system based on neural (ANFIS) for a direct torque to twelve sectors controlled of the induction motor. The proposed controller integrates fuzzy logic algorithm with a structure of artificial neural network (ANN) five-layer in order to reap the benefits of both methods, the learning abilities of the first and...
This paper presents a direct torque control technique for Brushless DC motors with non-sinusoidal back electromotive force. Direct torque control has some benefits such as faster torque response and reduced torque ripple for driving the Brushless DC motors. The Sliding mode observer, which is robust to parameter uncertainties, can be used to estimate the back-EMF and generate the torque. It is employed...
A simple algorithm for 4-level inverter based on Space Vector PWM scheme is proposed. 4-level inversion is achieved by connecting a 3-level inverter and a 2-level inverter in open-end winding configuration. 3-level inverter is realized by cascaded connection of two 2-level inverters. The 3-level inverter is used to realize the sub hexagon center vector and 2-level inverter is used to realize the PWM...
A scheme for spreading the harmonic spectrum of Three-level Voltage Source Inverters is proposed in this paper. Space Vector based Sigma Delta Modulation is employed in the proposed scheme. The principle of Vector Quantization is applied for quantizing the reference Space Vector in the Sigma Delta Modulator. For the spatial quantization, the inverter voltage vector space is divided into different...
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