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This paper proposes a wind turbine simulator (WTS) equipped with real-time monitoring and a user-friendly parameter setup controlled by a C2000 microcontroller. This simulator consists of a 5-hp separate-excited DC motor, SIMOREG DC-Converter, which can provide the demanding torque precisely, for researching and developing wind turbine generator systems instead of using actual wind turbines. A grid-connected asymmetrical two-phase induction generator is used to test the operation of the wind turbine simulator. The experimental results confirm that the simulator provides the characteristics like an actual wind turbine. The proposed wind turbine simulator offers flexibility for analyzing the performance of the generator system for an energy conversion system under various operating conditions.

This paper presents the simulation of a small wind turbine for a grid connected asymmetrical two-phase induction generator (TPIG). The configuration of this system consists of a wind turbine simulator using a dc motor drive, TPIG, a machine side converter (MSC) and a grid side converter (GSC). The wind turbine simulator is made from a dc motor operated by torque control for supplying mechanical power to TPIG. A three-leg voltage source inverter is used for MSC which can operate in motoring and generating modes controlled by a V/F technique based on unbalanced two-phase space vector. A single-phase switch mode converter is used for MSC which is able operate in rectification and inversion modes offering nearly sinusoidal current waveform and nearly unity power factor by controlling dc link voltage to be constant based on hysteresis current control. This system is simulated by the MATLAB/Simulink software. The simulation results show that the wind turbine simulator is able to generate the torque-speed characteristics of a small wind turbine and this system is also able to transfer power to grid.

This paper presents the analysis and the comparison study of a High-voltage High-frequency Ozone Generator using PWM and Phase-Shifted PWM full-bridge inverter as a power supply. The circuits operations of the inverters are fully described. In order to ensure that zero voltage switching (ZVS) mode always operated over a certain range of a frequency variation, a series-compensated resonant inductor is included. The comparison study are ozone quantity and output voltage that supplied by the PWM and Phase-Shifted PWM full-bridge inverter. The ozone generator fed by Phase-Shifted PWM full-bridge inverter, is capability of varying ozone gas production quantity by varying the frequency and phase shift angle of the converter whilst the applied voltage to the electrode is kept constant. However, the ozone generator fed by PWM full-bridge inverter, is capability of varying ozone gas production quantity by varying the frequency of the converter whilst the applied voltage to the electrode is decreased. As a consequence, the absolute ozone quantity affected by the frequency is possibly achieved.

Three-phase PWM AC-AC Matrix Converter using 9-sets of IGBT-Power Diode bi-directional switches as main power switching devices, given output voltages of 3, 6, and 9-pulses per half cycle, is synthesized to determine the required PWM switching waveforms for three-phase matrix converter circuit as well as the required PWM switching waveforms for the multiplexer/de-multiplexer circuit. Theses switching waveforms are used to design and construct the various pulses Three-Phase PWM AC-AC Matrix Converter. This converter can be divided by 6-modes and described in this paper. The converter is tested with passive load as well as induction motor load to measure output voltage and current waveforms at different frequencies of each modulation index. Experimental ratios of RMS output voltage and frequencies as modulation index varies for the case of passive load and induction motor load are plotted and compared with theoretical results. Both of them show to agree, and appear to be constant ratio (V/f constant) which is useful for speed control of an induction motor.

This paper presents performance comparison of High-voltage High-frequency Ozone Generator using PWM and Phase-Shifted PWM full-bridge inverter as a power supply. The circuits operations of the inverter are fully described. In order to ensure that zero voltage switching (ZVS) mode always operated over a certain range of a frequency variation, a series-compensated resonant inductor is included. The performance comparison are ozone quantity and output voltage that supplied by the PWM and Phase-Shifted PWM full-bridge inverter. The ozone generator fed by Phase-Shifted PWM full-bridge inverter, is capability of varying ozone gas production quantity by varying the frequency and phase shift angle of the converter whilst the applied voltage to the electrode is kept constant. However, the ozone generator fed by PWM full-bridge inverter, is capability of varying ozone gas production quantity by varying the frequency of the converter whilst the applied voltage to the electrode is decreased. As a consequence, the absolute ozone quantity affected by the frequency is possibly achieved.