This work develops a combined control for a stand-alone permanent magnet synchronous generator (PMSG) working with variable source and output demand. The power circuit consists of one PMSG, driven by uncontrolled prime mover supplying load through two voltage source converter (VSC) connected through a dc link capacitor. The main objective of the control is to supply load at constant voltage and frequency, even with variation in source speed and power, and also to accommodate the change in load transients. The generator side converter control is developed in rotor flux oriented synchronously rotating reference frame, to keep the dc link voltage, of the back to back VSC, constant. The load side converter control is also developed in the synchronously rotating reference frame to supply load at constant voltage and frequency. The developed combined control strategy is implemented in MATLAB/SIMULINK environment and found to be successful under all considered operating conditions. The theoretical findings are experimentally verified with a real-time prototype. * reference d, q-axis load voltage
The proliferation in the power electronics technology made many of the electric devices controlled in a flexible manner as desired by the load. In this process of flexible control we need to take care of harmonics injected by the power electronic equipment. With the increase in harmonics heating and de-rating of the device are the most critical factors that will affect the performance the devices. In this paper, we focus on the iron losses of a transformer operated by Sinusoidal PWM inverter. We considered 1-φ half bridge Bipolar SPWM Inverter with regular sampling method. Operation of the inverter mainly depends on PWM parameters. With the variation in the amplitude modulation ratio and frequency modulation ratio, performance indices of the transformer are analyzed.
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