Interline hybrid continuous converter impedance control-based tuning filter: effective harmonic suppression in DG-integrated electrical power grid

Total harmonic distortion is an important issue in integrated distributed generation energy systems which affect the performance. Interline hybrid continuous converter impedance control-based tuned filter is proposed to mitigate the harmonics, i.e., 10–12% reduction in integrated energy system. Effective transformer impedance is used instead of entire grid network impedance. Transformer impedance control from 0–20% is used in testing of the reactive voltage drop at point of common coupling. Transformer impedance is proportional to the turns ratio and corresponding voltage changes at the load center and it is imposed by the hybrid tuned filer. Hybrid tuned filter is designed with the impedance of transformer along with converter circuit impedance to control harmonic currents and voltage profile of integrated system. Proposed hybrid filter design consists of both instantaneous capacitor voltage \(v_c(t)\) $v_c(t)$ component and combined inductor–capacitor filter voltage component \(v_f(t)\) $v_f(t)$ to mitigate the harmonic component and improve power factor. Proposed hybrid tuned filter is tested over a strong grid conditions that deliver the power to all loads. As well as weak grid condition is also tested with proposed tuning filter. Testing environments, like linear loading and nonlinear loading, are validated in all grid operating conditions.