Filter LC Pasif Untuk Rangkaian Inverter Satu-Fasa pada Aplikasi Sistem Listrik Energi Baru Terbarukan Skala Rumah = LC Power Passive Filter Circuit for Single Phase Inverter in Residential-Scale Renewable Energy Electricity System Applications

This thesis illustrates a new method to tune LC filter parameters that will be utilized to attenuate the undesirable harmonic output voltage of DC-AC inverter to generate output waveform approaching pure sinusoidal. This method transforms two-order time-domain equation specification through LC filter transfer function mapping, thus forming simultaneous non-linear equations. This simultaneous equation is solved by applying the Jacobian iteration method until obtaining the required filter parameters. This method offers better results than the existing related methods through Spice simulation in voltage and current THD. The simulation results show the identical voltage and current THD value, which is 0.016%. The parameter values obtained are validated through experiments (hardware testing) to measure THD and the output voltage value with a 5 Watt load, having an impedance of +50Ω. However, the test results provide a deviation value, specifically for the THD voltage of 11.1% under load conditions and 10.4% under no-load conditions. The deviation is presumably induced by selection of the passive component types that are unsuitable for the power filter application. Other than that, the impact of the utilization of damper resistor is also analyzed. Through simulation, damper causing the decreasing of power efficiency into ~89%. It is generated by dissipated power from the damper.
Keywords : Passive power filter, THD, residential scale, single-phase inverter, LC low-pass filter, power efficiency, damper