Design And Control Strategy Research Of Automatic Control System For Steel Gate Of River Course

Water gate undertakes important safety tasks such as power generation and flood control,which not only directly affects flood control safety,but also has a great relationship with power generation efficiency.How to obtain and make use of hydrologic data,electricity demand information,properly handle contradictions,reasonable control decision-making,on the premise of ensure the safety of flood control,flood water control real-time scheduling,get as far as possible big comprehensive benefit of water conservancy hub,is the present water conservancy hub flood gate automation system is one of the important topics.At the same time,the safe operation of the gate is the foundation to ensure that these tasks can be completed stably.The running time of some sluices in Fuzhou is too long,and the automatic control cannot be realized due to the early construction time.It is of great significance to study the automatic control system of the gate and determine the control strategy of the gate.The main research contents and results of this paper are as follows:1.Static stress analysis and structural improvement of gate.The static stress of the gate under three operating conditions is analyzed by establishing a three-dimensional model of the gate.From the analysis of the simulation results,it can be concluded that the strength of the panel,beam and vertical beam of the steel gate obtained by the simulation calculation meets the requirements of the code.At the same time,since the maximum stress of the vertical beam of the gate under the third working condition is 143.4 MPa,which is very close to the allowable stress of 144 MPa,the structure of the gate is improved.The structure of the gate was improved by adding reinforcing bars and increasing the thickness of the vertical beam for two weeks.The analysis found that the maximum stress of the gate was reduced to 125 MPa when the structure was improved by reinforcing bars.Although it was reduced to a certain extent,the reduction was small.The maximum stress of the gate can be greatly reduced by increasing the thickness of the gate vertical beam.When the gate vertical beam thickness reaches 16 mm,the maximum stress of the gate is 85.9 MPa,and when the gate thickness reaches 20 mm,the maximum stress of the gate is 71.6 MPa,which meets the strength requirements.Therefore,the final recommended gate improvement scheme is to increase the gate vertical beam thickness to 16mm.2.Hardware design of automatic gate control system.The overall analysis of the gate automation control system is completed.According to the requirements of the gate control system,reasonable hardware selection is made and the connection circuit and control process are studied.For the selection of water level sensor,gate opening sensor and PLC model,the water level selected Yunyi-806A1 type high frequency radar level gauge for measurement,gate opening selected ZWY-4Ⅲgate level measurement and control instrument for detection,and the S7-200PLC in the S7 series of Siemens factory as the control core.Through the analysis of the gate control requirements,Yunyi-806A1 type high frequency radar level gauge,ZWY-4Ⅲtype gate level measurement and control instrument and S7-200PLC can realize the automatic control of the gate.3.Study on daily scheduling strategy of gate.To effectively solve the fuzhou river water level is not high and the water pollution problem,in view of the fuzhou city center comments-light harbor basin river,river by Info Works ICM hydrodynamic model,to establish one-dimensional unsteady flow Saint Venant equations to simulate-rivers and estuary water state,through comparing the nine different water test,the brake pump configuration adjustments,chose the optimal scheduling scheme.At the same time,the water quality model is established,the scheduling of water environment simulation,biochemical oxygen demand(cod)level fromⅣclasses intoⅢthe length of the scheduling scheme of assessment as one of the objective function,the optimal scheduling scheme is given finally.4.Research on Gate Control Mode Based on PID.After determining the control strategy of the gate,it is necessary to develop a fast and accurate control method to realize the gate.Based on the analysis of PID control principle,incremental PID control method is adopted to control the opening of the gate.At the same time,based on the actual control mode of the gate,three improved methods are proposed to the PID control mode,and the final PID control parameters are determined by simulation,and the control parameters are K_P=0.01,K_i=0.05,K_d=0.015.Finally,the opening and closing process of the gate is analyzed.5.Automatic gate control system and control strategy testing.The test results show that the operating efficiency of the gate can be improved by 30%～40%effectively.The safety and reliability of the control system are proved by testing the automatic control system of the gate.The final results show that the scheduling strategy can keep the river water level within a certain range,and can meet the requirements of flood discharge and waterlogging prevention as well as maintaining the river water level.