Electro-hydraulic proportional Synchronous Control System of Ring gate for Hydraulic Turbine

Based on the analysis of opening and closing control manner for ring gate of hydraulic turbine, the electro-hydraulic proportional control system for ring gate of hydraulic turbine was studied. A new control system, which combines mechanics, hydraulics and electrics, was presented. More particularly, the modules of speed control and multi-cylinder synchronous control for the movement of ring gate was designed. The modules include control valve group, flow dividing module consists of flow dividing motors, and oil distributing module. And the ring gate control system principle under different condition was also studied. By the engineering application in Yunnan Honghe Nansha hydropower plant, it was show that all functions and performances of the control system satisfied the designing requirements.