Simulation of D-Statcom with hysteresis current controller for harmonic reduction

This paper describes a method for controlling the source currents of a distribution system. Nonlinear loads such as traditional diode/thyristor rectifiers with R, L, C loads generate harmonic and reactive current, which leads to poor power factor, low energy efficiency, and harmful disturbance to other appliances. Active Power Filters (APFs) are one of the viable solutions to eliminate the power line harmonic/reactive currents generated by nonlinear loads and improve the power factor. D-Statcom is connected in parallel with the nonlinear loads and functions as current sources to cancel the harmonic/reactive components in the line current so that the current flow into and from the grid is sinusoidal and in phase with the grid voltage. A hysteresis controller is used for tracking error. The actual current tracks the reference current either in the upper band or in the lower band, resulting in an bier eased tracking error. The results are analyzed and presented using Matlab/Simulink software.