Abstract
Power quality has become a major concern in modern electrical power systems due to increased use of nonlinear loads, renewable energy integration, power electronic converters, and sensitive industrial equipment. Disturbances such as voltage sag, swell, harmonics, flicker, transients, and unbalance affects the reliability and performance of electrical devices. Traditional passive techniques are no longer sufficient to mitigate these issues effectively. Hence, active power quality improvement techniques using advanced power electronic devices and intelligent control strategies are widely adopted. This paper reviews different active power quality improvement methods including Active Power Filters (APF), Unified Power Quality Conditioner (UPQC), Dynamic Voltage Restorer (DVR), Distribution STATCOM (DSTATCOM), and hybrid filtering methods. Control strategies, comparison of techniques, advantages, limitations, and recent developments are discussed. The paper also highlights future trends toward smart grid and AI-based control for power quality enhancement.
Keywords: Power quality, Active power filter, UPQC, DVR, DSTATCOM, Harmonics mitigation, Voltage sag compensation.
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