Frequency regulation of hybrid power system using reduced order disturbance observer-based integral sliding mode controller

The penetration of wind power into the power system constitutes many challenges to the grid caused by intermittent wind characteristics, which causes variation in system frequency and voltage. The deviation in frequency plays an essential role in maintaining power system stability. To reduce the frequency deviation, a reduced-order disturbance observer (RODO) based integral sliding mode control (ISMC) is applied in a hybrid power system (HPS). A RODO is used to estimate load and fluctuating wind perturbation when all the system states are not fully measurable. An ISMC is designed with RODO to improve dynamic performance and reduce the chattering effect. The performance of RODO-ISMC has been investigated under the action of multiple load perturbation and fluctuated wind power. The results found with RODO-ISMC are compared with RODO based state feedback controller (RODO-SFC) and classical controller.