Abstract: Electrical power quality determines the fitness of a system. Major power quality issues nowadays are harmonics and reactive power. Non-linear loads are the main cause of introduction of harmonics in the system. To mitigate these harmonics, suitable filters are needed to be introduced in the system. Active power filter provides an effective and adjustable solution to eliminate harmonic current and compensate reactive power in an electrical power system. Its performance depends on the strategies employed and the type of controller being used in reference current generation. This paper presents a survey on using soft computing techniques and application of different control strategies in active power filter.

Keywords: Shunt active power filter (SAPF), voltage source inverter(VSI), PI controller, PID controller, fuzzy logic controller, PSO, control strategies.