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Induction motor speed control was relatively difficult, because the generated torque and flux are related or not free. In addition to adjusting the speed, it required inverter control. The inverter output was not a pure sinusoidal signal but it is the result of the switching. Therefore, it was necessary to be able to fix the method of switching the inverter output signal that can adjust induction...
This paper proposes a boost inverter topology to realize the reference currents generated by Instantaneous Symmetrical Component theory. The circuit topology and the switching pattern of the boost inverter boosts up a low voltage DC (e.g. photovoltaic panel or fuel cell) of a sustainable energy source to inject the required filter currents. The proposed boost inverter can perform load balancing, harmonic...
In this paper a novel hysteresis current controller for APF(active power filter) with low switching losses is suggested. The controller adjusts the switching frequency with the output current of APF to reduce the switching losses effectively with the same control precision, utilizing the characteristic of APF that the sum of absolute value of three-phase output current of APF would greatly fluctuate...
The switching losses of Active Power Filter (APF) is one of the important factors that influence the performance-price ratio of APF. In this paper, a novel method is suggested. Under this new method, each phase output reference current of APF is compared to adjust hysteresis of each phase, so that the switching number of the phase that has greater switching losses is decreased, meanwhile the switching...
The traditional control method for PV grid-connected inverter is two closed loop, if this control method is used for PV grid-connected system, the indication of slow response or increased troubles of system design which is caused by instability of switching frequency. This paper presents a three-loop control to overcome such problems, voltage external loop, current middle loop and frequency inner...
This paper presents a dynamic hysteresis current control for a three-phase four-leg voltage source inverter topology. In order to improve the performance and life of the power switches of voltage source inverter, we require an optimized control technique which reduces its switching frequency. Proposed hysteresis current control method is a generalized control method which minimizes switching operations...
This paper presents a detailed study on the design and analysis of User-Defined Constant Switching frequency (UDCS) current control based four leg distribution static compensator. The three phase legs of the voltage source inverter are operated with hysteresis control whereas the fourth leg by a square switching pulse of user defined frequency so that the switches of all the legs operate with constant...
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