By using usual industrial switching methods, two new multicarrier PWM (MCPWM) methods are proposed in this paper to improve the output voltage characteristics for eleven levels diode-clamped inverter. DC component and Even harmonic orders of the output voltage are total More
By using usual industrial switching methods, two new multicarrier PWM (MCPWM) methods are proposed in this paper to improve the output voltage characteristics for eleven levels diode-clamped inverter. DC component and Even harmonic orders of the output voltage are totally eliminated in the proposed VFCBOD and COOD methods by applying the phase shift in the carrier wave (carrier-based); so total harmonic distortion (THD) and torque ripple are reduced. By using the both proposed methods, the number of pulses per cycle equally are distributed and increased the lifetime of the switches. In this paper, a full bridge has been series with each phase of eleven levels diode-clamped inverter to change the polarity of the voltage to produce more switching patterns to generate the specified voltage levels. Then, by determining suitable switching patterns, the inverter can be driven with the least of switches when there is a failure and finally increased the reliability of the whole system.
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With the increasing of sensitive loads such as data centers, the use of DC microgrids has increased. Line to ground fault is the most common type of fault in this type of microgrid, which causes various damages to the DC microgrid. One of the most important challenges i More
With the increasing of sensitive loads such as data centers, the use of DC microgrids has increased. Line to ground fault is the most common type of fault in this type of microgrid, which causes various damages to the DC microgrid. One of the most important challenges in operating a DC microgrid is the lack of effective protection against this faults type. In this paper, by using local measurements such as voltage and current at the beginning of each line, the instantaneous power changes in them are computed and a new protection scheme that is not based on any communication line is presented. The proposed protection scheme has good accuracy and speed of operation and is able to detect line-to-ground faults in DC microgrids with high-speed. The accuracy and precision of the protection scheme has been tested under different conditions.
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