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Renewable energy has become an alternative energy to replace fossil fuels in electric power generation systems to alleviate environmental problems in the future. Alongside the shift to renewable energy, microgrid technology has also evolved to integrate renewable energy into the power generation and distribution system. In addition, the issue of voltage stability is also a vital factor in sustaining microgrids with renewable energy integration to ensure system stability. Reports in earlier studies have included three voltage control methods such as Model Predictive Control (MPC), PI controller, and negative feed-forward voltage control, implemented to ensure voltage stability of hybrid renewable energy microgrids. However, very a few research reports apply voltage control in hybrid biomass (BM)-solar photovoltaic (PV)-wind microgrid, choosing only to focus on energy management, economic analysis, and best sizing. For this reason, this main objective of this paper is integration of hybrid Biomass-Solar Photovoltaic-Wind off-grid microgrid comprising a PI controller as the voltage control of the system based on an actual input database at a location in a small rural town named Mersing in Malaysia. Additionally, this paper also intends to illustrate the implemented efforts to support the voltage stability of the system for the Mersing case study. A PI controller with harmonic filter voltage controller is implemented in this study to reduce the Total Harmonic Distortion (THD) percentage. The average power output for solar, wind, and biomass energy sources were 60kW, 20kW, and 750kW, respectively. Concurrently the measured THD voltage and current at each renewable energy and distribution line show a percentage below 10%. It is thus shown that a hybrid BM-Solar PV-wind microgrid is stable, especially for distribution lines, according to harmonic standards in the electricity supply application book by the local electricity provider Tenaga Nasional Berhad (TNB). Indeed, a PI controller with a harmonic filter has proven as an effective method for controlling the voltage instability in this study.

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