Research On Control Strategy And Its Application Of Ring Gate For Hydraulic Turbine Electro-hydraulic Proportional Synchronous System

With large-scale exploitation of hydraulic power, ring gate for hydraulic turbine as a new type of inlet valve is applied extensively. With the purpose of achieving automatic control of ring gate for hydraulic turbine electro-hydraulic proportional synchronous system, this dissertation mainly deals with software and hardware design, model and simulation of electro-hydraulic system, multi-cylinder synchronization and velocity control. The functions and performances of the equipment are verified by engineering applications in hydropower plant of Yunnan Honghe Nansha. The main contents and contributions of this dissertation are listed as follows:(1) Electro-hydraulic Synchronous Control System is researched based on the control function and mode of ring gate for hydraulic turbine. A new control mode, which combines mechanics, hydraulics and electrics, is presented. On the subject of the composition and working principle of the proposed system, the control module, motor diffluence module and distribution module of hydraulic system, position detecting module and PLC control module of electric system are analyzed and designed.(2) The nonlinear dynamic mathematical model is submitted based on the analysis of the primary hydraulic components. On the subject of high requirement of synchronization and velocity control in ring gate elevating process, a new control mode of double closed loop such as synchronization closed loop and velocity closed loop is formulated. Response characteristic with different conditions is analyzed by simulation with MATLAB.(3) To satisfy the requirement of multi-cylinder synchronization and velocity control in electro-hydraulic synchronous control system of ring gate for hydraulic turbine, a new control algorithm with fuzzy-PID and CMAC-PID is formulated. The outer feedback loop using fuzzy-PID acts on the multi-cylinder velocity control, and the inner feedback loop using CMAC-PID acts on the multi-cylinder synchronous control. Simulations and experiments show that it improves control effect.(4) The functions and performances of ring gate for hydraulic turbine electro-hydraulic synchronous control system are verified by engineering applications in hydropower plant of Yunnan Honghe Nansha.