Reduction of harmonic using single phase shunt active power filter based on instantaneous power theory for cascaded multilevel inverter

The use of renewable energy such as solar is nowadays exceptionally used in electrical systems due to increasing on power demand. Thus, power electronic converters are widely used to perform the required energy conversion. However, the device such as multilevel inverter (MLI) is designed without harmonic-less. This phenomenon will create power quality problem such as increases in total harmonic distortion (THD). Moreover, increasing of the nonlinear loads usage also contributed in harmonic problem. This paper presents the single phase shunt active power filter (APF) based on instantaneous power theory. The performance of APF depends on instantaneous power theory control strategies which combined with the cascaded MLI to reduce the THD in load current. It enables to provide compensation of harmonic and reactive power in good performance. Generally, the instantaneous power theory is implemented in three phase APF. However, it can be used in single phase by assuming equal voltage and current and the other two voltages and currents are duplicated with 120° angle shifting that will be used for input of instantaneous power theory. The system is validated through extensive simulation with the aid of MATLAB/SIMULINK Toolbox to analyze the output waveform and THD values of current and voltage. The implementation of shunt APF to MLI, the THD of current can be reduced around 70% to 84%.