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ABSTRACT: This paper presents a novel topology for a direct ac-ac power converter, called as the “three-to- k ” phase matrix converter. The input to the proposed matrix converter configuration is a three-phase fixed voltage and a fixed frequency supply from the grid. The output is a variable voltage and variable frequency ac supply of any number of phases ( k phase). However, the discussion is limited here for a k that is equal to odd number of phases. As an example, a “three-to-five” phase matrix converter is utilized for discussion and analysis. This paper also proposes two pulsewidth modulation (PWM) control techniques for the general topology of the “three-to- k ” phase matrix converter. This is based on the so-called direct duty ratio PWM (DPWM). In one presented technique, the output voltage is limited to one half of the input voltage. For the other proposed scheme, the output voltage is enhanced to 78.86% of the input voltage. The proposed control algorithm is validated using simulation and an experimental approach.
IEEE Transactions on Industrial Electronics 10/2011; · 5.16 Impact Factor
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ABSTRACT: The paper proposes finite state model based current control of a three-level neutral point clamped (NPC) five-phase voltage source inverter. The space vector model of a five-phase voltage source inverter (VSI) yield 243 space vectors, with 240 active and three zero vectors. The presented technique utilizes only 21 space vectors for the current control and hence the name finite state is given. Search is made by the algorithm to find the vector which minimizes the chosen cost function. The performance of the current control heavily depends upon the choice of the cost function, the number of vectors used and the sampling time. The developed technique is tested for RLE load using simulation approach. The proposed technique offers very good capacitor voltage balancing and offers high performance results in terms of current distortion. The technique is very useful for real time implementation due to a small number of vectors being used in contrary to space vector PWM where at least 43 vectors are required to obtain similar results. Simulation results are given in the this submission, while the experimental validation of the concept will be provided in the final paper.
IECON 2010 - 36th Annual Conference on IEEE Industrial Electronics Society; 12/2010
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ABSTRACT: This paper analyses operation of an indirect rotor field oriented controlled five-phase induction machine with current control in the synchronous reference frame. Artificial Neural network (ANN) based Space vector PWM (SVPWM) technique is utilized to control the five-phase voltage source inverter feeding the five-phase induction machine. Performance, obtainable with ANN based space vector PWM and conventional space vector PWM are compared for a number of operating conditions on the basis of simulation results. Full decoupling of rotor flux control and torque control is realized for wide range of speed operation using both SVPWM and ANN based SVPWM. Dynamics, achievable with ANN based SVPWM, are shown to be slightly better when compared to the conventional space vector PWM method. Nevertheless, the gain in the torque characteristics is offset by their computational intensive algorithms. Thus the conventional approach is easier to employ for such applications.
Power Electronics Conference (IPEC), 2010 International; 07/2010
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ABSTRACT: The paper proposes model based current control of a five-phase voltage source inverter considering a finite set of control actions. The space vector model of a five-phase voltage source inverter (VSI) yields 32 vectors, with 30 active and two zero vectors. The presented technique utilizes 11 space vectors for the current control and hence the name finite control set is given. Search is made by the algorithm to find the vector which minimizes the chosen cost function. It is shown that the performance of the current control relies upon the choice of the cost function, the number of vectors used and the sampling time. The developed technique is tested for RLE load using simulation approach.
Industrial Technology (ICIT), 2010 IEEE International Conference on; 04/2010
