The combination of thermal control system and mechanical

coordination of the engine control

automatic power grid frequency control

system security and fault tolerance features of 2 ×20 MW hydropower generating unit speed governing system of Qingyuan Company are intrduced

the control system and system structure are detailed explained respectively. The technical characteristics of regulating mode conversion

frequency modulation function realization

joint control

fault-tolerant technology measures and other aspects of the speed control system are analyzed. The transformation of Qingyuan 2×20 MW hydropower units

both in system technology

security and combination of reconstruction and the actual equipment are very reasonable and feasible. Through the transformation can reach the goal of transformation.