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This paper presents a high-performance vector control strategy for Multilevel Inverter (MLI) fed induction motor drive system. In the proposed drive system, an adaptive and online trained sugeno type neuro-fuzzy speed controller is used to improve the speed tracking performance. The generation of Pulse Width Modulation (PWM) patterns for multilevel inverter is obtained using space vector PWM algorithm. The complete drive system is implemented in real time using DS1104 controller card. Using the experimental setup, the performance of the proposed drive system is tested under different speed commands, mechanical parameter variations and load disturbances. The experimental results show that control performance of the proposed drive system is satisfactory. [ABSTRACT FROM AUTHOR]

In this paper, the effect of carrier waveform variations on inverter output voltage in multilevel inverters is examined. For this aim, carrier waveforms with various frequency and amplitude are constructed and compared with the reference sinusoidal signals. The obtained PWM waveforms are then applied to the power switches of the inverter. A five-level inverter prototype implemented and the real-time signals are produced using dSPACE DS1103 controller board and software's. The proposed multilevel sinusoidal PWM (SPWM) strategy is tested experimentally and the results obtained are presented. [ABSTRACT FROM AUTHOR]

In this study, Pulse Width Modulation (PWM) signals of 1-16 kHz variable frequencies and variable duty cycles are produced by using Xilinx XC3S500E-4FG320 Field Programmable Gate Arrays (FPGA). VHDL (Very High Speed Integrated Circuit Hardware Description Language VhsicHDL), hardware description language, is used for programming FPGA. The produced PWM signals are applied to the drive circuit of a direct current motor and thus, the defined operation speeds are achieved. The motor speed is obtained by a disc attached motor shaft and an optic transducer, and is processed by FPGA then displayed on digital display (LCD). The produced PWM signals are both simulated using Xilinx programming interface unit and validated by observing the oscilloscope screen. [ABSTRACT FROM AUTHOR]

In this paper, a sliding mode controller is designed for active shaping of the input current in the boost converter. Robustness of the designed controller is tested with variable output voltage references, different loads and network voltage variations. For the simulations, MATLAB/Simulink programme is used. From simulation results, the same phase was provided between input current and input voltage and nearly unity power factor was obtained. [ABSTRACT FROM AUTHOR]

Distribution Static Synchronous Compensator (D-STATCOM) is an inverter based custom power devices used to improve power quality problems in distribution systems. In this paper, design of inverter, measurement, protection and dead-time circuits needed to build experimental setup of three-level H-bridge inverter based D-STATCOM is explained in detail. In addition, selection of passive elements which are coupling inductance and dc-link capacitor being important for dynamic response of compensator is given. In experimental study, DS1103 controller card from dSPACE firm is used to transfer data between D-STATCOM and computer. D-STATCOM's ability for reactive power support is tested in experimental setup by changing of iqref as on-line and some results are given. [ABSTRACT FROM AUTHOR]