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Cascaded Three Level Inverter Based Shunt Active Power Filter with Modified Three Level Hysteresis Current Control

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A Cascaded three level inverter is controlled by using a three level HCC technique. The method has certain advantages compared to a two level HCC, such as a reduced switching frequency and a variation in switching frequency. However, this method suffers from tracking error in current due to dead zones provided between bands. This work aims at the development of modified three level hysteresis current controller (HCC) for a cascaded three level inverter-based shunt active power filter (SAPF) to mitigate the harmonics in a three-phase three-wire systems. Such method significantly reduces the current tracking error, the maximum switching frequency of the inverter as well as the variation in switching frequency. The simulation of the cascaded three level inverter-based shunt active power filter with a modified three level hysteresis current control is carried out in a PSIM environment for 2.5 kVA system. To validate the effect of degree of overlapping between the bands, two cases of a modified three level HCC are proposed. Both the cases are compared with conventional two-level HCC and three level HCC techniques. The simulation results show the effectiveness of the proposed scheme.
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Hysteresis Current Controller (HCC); Shunt Active Power Filter (SAPF); Three Level Hysteresis Current Controller

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