Impact of Speed Governor Additional Control on Isolated Grid Frequency Stability

Simple frequency feedback control is unable to balance the power,leaving the system frequency vulnerable to large offset and surging.Although power-frequency electric-hydraulic governor can control the power,it has adverse effect on primary frequency modulation.Therefore,this paper introduces the additional control of speed governor: with power deviation as feedback,three additional controllers have been designed — the proportion type,optimal PID type,and fuzzy type.An isolated grid simulation verifies the effect of the three types of additional speed control on the isolated grid.