Abstract:
Shunt active power filter (SAPF) is a custom power device (CPD) that compensates harmonics caused by customer side nonlinear loads, reactive power, and unbalance in current control mode distribution power networks.
SAPF harmonic compensators depend on the control approach, which detects the load harmonic current components to be adjusted. In this study, a 3-phase SAPF inspired by Lyapunov function-based control is devised to compensate feeder current harmonics caused by customer side nonlinearity.
The proposed technique determines a control law that renders the Lyapunov function derivative always negative for all stable states. The proportional-integral (PI) controller maintains DC-link capacitor voltage. This method reduces the shunt active power filter rating more than the other two widely used conventional ways.
The harmonic compensation efficacy of the proposed Lyapunov function-based SAPF is compared to two conventional approaches in four system scenarios: a simple nonlinear load with and without utility side voltage distortion, a modified IEEE 13 bus test distribution system loaded with a 3-phase chopper fed direct current (DC) motor drive at a single bus, and lastly for increasing the harmonic-constrained penetration.
The MATLAB/Simulink simulation reveals that total harmonic distortion (THD) of source current and dynamic and steady-state performance using Lyapunov function-based controller are much better than the other two standard techniques. The SAPF’s strong compensation performance helps it handle renewable energy’s rapid penetration.
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