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Abstract
The existing solutions for reducing total harmonic distortion (THD) using different control algorithms in shunt active power filters (SAPFs) are complex. This work proposes a split source inverter (SSI)-based SAPF for improving the power quality in a nonlinear load system. The advantage of the SSI topology is that it is of a single stage boost inverter with an inductor and capacitor where the conventional two stages with an intermediate DC-DC conversion stage is discarded. This research proposes inventive control schemes for SAPF having two control loops; the outer control loop regulates the DC link voltage whereas the inner current loop shapes the source current profile. The control mechanism implemented here is an effective, less complex, indirect scheme compared to the existing time domain control algorithms. Here, an intelligent fuzzy logic control regulates the DC link voltage which facilitates reference current generation for the current control scheme. The simulation of the said system was carried out in a MATLAB/Simulink environment. The simulations were carried out for different load conditions (RL and RC) using a fuzzy logic controller (FLC) and PI controllers in the outer loop (voltage control) and hysteresis current controller (HCC) and sinusoidal pulse width modulation (SPWM) in the inner loop (current control). The simulation results were extracted for dynamic load conditions and the results demonstrated that the THD can be reduced to 0.76% using a combination of SPWM and FLC. Therefore, the proposed system proved to be effective and viable for reducing THD. This system would be highly applicable for renewable energy power generation such as Photovoltaic (PV) and Fuel cell (FC).
Highlights
With the advent of power electronic converters, the power conversion for various applications has become quite easy
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Summary
With the advent of power electronic converters, the power conversion for various applications has become quite easy. Among all the power quality issues, the most prevalent one is the harmonics. Total harmonic distortion (THD) results in poor power factor, insulation failures, non-sinusoidal source, poor voltage profile, etc. The harmonic distortion in source voltage is very high when the power electronic interfaces relate to induction heating circuits, arc furnace, un-interruptible power supplies (UPS) [1,2]. Active power filters (APFs) [4] are embedded with control switches whose duty cycle is tuned to the amount of inclusion of LC values. The APF topology that is prevalently used in grid systems to compensate for the harmonic distortion have an energy storage component with an inverter. Many research works have been archived in proposing new topologies for the inverter or new control scheme of the inverter for compensating the harmonic distortion
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