Analysis of DC-link current and voltage ripples for five-phase
This paper aims to address such gap by presenting a method for calculating dc-link current and voltage ripples in five-phase voltage source inverter under unbalanced input
M.J. Hossain The proper regulation of the DC link voltage is a crucial aspect of inverter operation, as the voltage level of the DC link, serving as an intermediary component between the DC source and the inverter, directly governs the output frequency and voltage of the inverter.
A satisfactory DC link voltage is a precondition to achieve a high quality output power from the inverter . If the DC link voltage becomes lower than the grid voltage, then the direction of power flow will be from the grid to the DC link (which is not desirable). This also will result in excessive reactive power flow and harmonic distortion.
It should be noted that at the power factor of 0.4, the voltage ripple is approximately the maximum voltage ripple which is 8. Based on the simulation results, the power loss of DC- link capacitor is estimated and compared with the power loss of the electrolytic capacitor based inverter. The result is shown in Table III.
There are two ways in which the amplitude of the output voltage can be controlled. First, if the d.c. link is provided from the utility supply via a controlled rectifier or from a battery via a chopper, the d.c. link voltage can be varied.
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