H_∞ based Robust Frequency Stabilization of Isolated Wind Diesel Hybrid Power Systems

摘要

This paper focuses on the robust frequency stabilizer design based on H_∞ control for the isolated wind diesel hybrid power systems. The H_∞ control via normalized coprime factorization is employed to design robust frequency stabilizers for a governor in a diesel side and a pitch control in a wind turbine side. The robust frequency stabilizer not only requires a single feedback input, but also has a low order. Simulation studies reveal that the proposed robust frequency stabilizer is able to damp system frequency oscillation due to random load disturbances as well as changes in wind power inputs. Especially, the robustness against system parameter variations of the designed stabilizer is much superior to that of the proportional integral controller.