Recently, nine-switch inverter and nine-switch-zsource inverter have been proposed as dual output inverters. In this paper, the space vector modulation (SVM) of nine-switch inverter and nine-switch-z-source inverter is proposed. The proposed method increases the sum of modulation indices up to 15% in contrast with the conventional, scheme in which the sum of modulation indices is equal or less than one. The extra voltage available for a given input dc-voltage, translates to a higher torque-a critical factor for defining the capacity of products in marketplace. Also, in order to further reduce the cost of power devices and also thermal heat effect, and to reduce the number of semiconductor switching, specific SVM switching pattern is presented. This feature will be advantageous for high-power inverter applications where cost and efficiency are key decision factors. Furthermore, a novel SVM is proposed for minimizing total harmonic distortion. The performance of the proposed SVM for both nine-switch inverter and nine-switch-z-source inverter is verified by simulation. Experimental results validate the simulation results as well as the superiority of the proposed SVM.Index Terms-Nine-switch inverter, nine-switch-z-source inverter, space vector modulation (SVM).
In a recent paper, a novel approach was presented for the restoration of canonical signed-digit (CSD) numbers to their correct format after the application of crossover and mutation operations in genetic algorithms. This paper is concerned with the development of a new technique for the optimization of FIR digital filters over the CSD coefficient space based on genetic algorithms. This optimization technique exploits the aforementioned restoration of CSD numbers in conjunction with the conventional crossover and mutation operators in addition to a new local mutation oper-ator. The resulting technique is applicable not only to the global optimization of FIR digital filters, but also the conversion of digital filters with specified infinite-precision coefficients to their corresponding finite-precision CSD coefficients. An application example is given to illustrate the resulting technique.
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