Title:
Adaptive Sliding Mode–Fuzzy Logic Hybrid Control for Shunt Active Power Filters to Enhance Grid Voltage Regulation in Distributed Generation Systems

Authors:
Adel Elgammal, Trinidad and Tobago

Abstract:

The integration of distributed generation (DG) systems into present power networks has exposed the system to substantial problems concerning voltage stability and the threatening power quality problems, such as harmonics distortion, reactive power imbalance, and voltage flickers. Under the light of the latter issues, in this work, an ASM–FLC technique for SAPFs is developed for improved grid voltage regulation and stable operation with DGs. The advantages of Sliding Mode Control (SMC) and Fuzzy Logic Control (FLC) can be combined in the proposed controller. In the hybrid approach, the sliding surface is adaptively designed with fuzzy inference rules according to instant errors voltage and current dynamics, this allows an adaptive gain-switching value adjustment of gains switching which then considerably reduces chattering while guarantee rapidity transient response. The control system is adopted to obtain the reference compensation current of the voltage source inverter (VSI) for SAPF, and high performance harmonic elimination and reactive power compensator are achieved under non-linear and unbalanced load conditions.
 
Extensive MATLAB/Simulink simulations were conducted on such a system under the grid-connection to be implemented using distributed generation test platform based on renewable sources. The ASM–FLC controller is also analyzed by comparison with the traditional PI, pure FLC, and classical SMC controllers. Simulation results reveal that the hybrid controller performs better for voltage regulation, THD reduction (more than 45%), and dynamic stability against load/source disturbances. And the adaptive control is able to achieve robustness with respect to parameter uncertainty and grid impedance change. The ASM-FLC proposed control strategy provides an efficient, intelligent and real-time solution for improving power quality and stabilizing the voltage in DG system and useful for secure penetration of RE sources with supporting to smart grid technology.

DOI: http://dx.doi.org/10.51505/ijaemr.2025.1506