A dual-phase strategy for oscillation damping in power systems: transitioning from traditional stabilizers to solar farms using PSSE and PSCAD

Abstract The integration of renewable energy into existing power grids presents significant challenges due to the intermittent nature and rapid dynamics of renewables. These characteristics can lead to power system oscillations, notably inter-area oscillations, which may result in power generation loss, reduced transmission capacity, and potential blackouts. Additionally, local power plant-level oscillations further minimise equipment wear and efficiency. This paper presents a Kundur two-area power system model to address these issues, offering a straightforward framework for analysing system stability. The model focuses on local and inter-area oscillations and their mitigation, which are crucial for maintaining system stability. Two mitigation techniques are modelled and analysed. The first uses phase-compensated power system stabilisers within the Kundur two-area network modelled in PSSE, emphasising their impact on system stability. The second replaces conventional hydropower plants with renewable energy sources, eliminating traditional damping equipment. In this scenario, a solar farm in hybrid mode manages both active and reactive power without stabilisers, as modelled in PSCAD. This approach effectively dampens inter-area and local oscillations. A three-phase bus fault is used to induce disturbances for system testing. RMS and EMT dynamic simulations are conducted within PSSE and PSCAD software, respectively, demonstrating the effectiveness of both techniques in mitigating power system oscillations, thereby enhancing system stability. Notably, the solar farm in hybrid mode presents a promising solution for integrating renewables while maintaining stability without traditional damping equipment.