Abstract: Standalone micro-hydropower systems are widely deployed in remote regions where extending the main electrical grid is not economically feasible. Maintaining stable voltage and frequency under varying load conditions remains a key challenge in such isolated systems. Electronic Load Controllers (ELCs) are commonly used to regulate generator speed by diverting surplus electrical energy to ballast loads. Although ELCs successfully stabilize frequency, they introduce power quality concerns such as harmonic distortion and power factor degradation due to nonlinear switching devices. This paper reviews the main power quality improvement techniques used in Electronic Load Controllers for standalone micro-hydro systems. Various converter topologies and control approaches are discussed, and their performance characteristics are compared. Key challenges and possible improvement areas are also highlighted.

Keywords: Electronic Load Controller, Micro-hydro power plant, Total Harmonic Distortion, Power Quality, PWM Control.

Downloads: | DOI: 10.17148/IJIREEICE.2026.14205