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Design and analysis of DC/AC inverter using passive LCL filter with damping circuit configuration
Samman F.
2017 International Seminar on Intelligent Technology and Its Application Strengthening the Link Between University Research and Industry to Support Asean Energy Sector Isitia 2017 Proceeding
Abstract
This paper presents the study and analysis on the impacts of the insertion of a damper circuit in an LCL passive filter utilized to filter DC/AC inverter's output voltage. The damper is used to reduce peak resonance on its frequency response curves. The existing resonance frequency can make the filtered inverter output voltage become weak and unstable. One of existing solutions to overcome this problem is proposed by using of a damping resistor. Damping method can be applied using various configurations. However, this paper only discussed two damping configurations, namely series and parallel damping configuration. We use three criteria to analyze the impacts of the damper circuits, i.e. its capability of reducing total harmonic distortions (THDs), to maintain the output voltage and to improve output power of the inverter. Theoretically, the damper can reduce its peak resonance frequency. However, in any circumstance, it can potentially reduce the inverter's power, voltage output amplitude, and cannot improve its THD reduction.