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The unbalanced and nonlinear loads could result in a significant neutral current in the three-phase four-wire distribution power system. This paper proposes a novel neutral line active power filter (APF) system based on the special connection of the transformers and single-phase inverter. The theory analysis and computer simulations show that: (a) control system would be easy to implement due to only...
The repetitive control has been widely used in grid connected voltage source converters, such as uninterruptible power supplies (UPS), photovoltaic inverter (PV) and active power filter (APF). This paper introduces a new repetitive control strategy in the APF system; the proposed control strategy has a forgetting factor (FF), which could improve control system robustness. Control system stability...
This paper analyzes the characteristic of singlephase converter system and establishes the active power and reactive power model in d-q axis, which is the same with the three-phase system in d-q axis and could employ decoupling feedback control for reactive compensation and active power control. For realizing d-q transformation in single-phase system, a new orthogonal decomposition method with sliding...
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