| In view of the increasingly serious energy and water resources problems,a wind power seawater desalination system is proposed.The wind power seawater desalination system includes a wind energy capture module,a driving module and a seawater desalination module.The vertical axis wind turbine is fixed on the tower.After the wind is up,the pneumatic suspension efficiently captures the wind energy.The high-pressure water pump mechanically coupled with the rotating body is pumped into the high-pressure water tank by the pretreatment seawater pumped into the high-pressure water tank after the planetary gear is increased in speed.The pretreated seawater is sent to the desalination membrane group.This paper mainly studies from the aspects of scheme design,model construction,performance analysis,control strategy and simulation experiment of wind water desalination system.Based on the on-site inspection in conjunction with the sea conditions in Rizhao City,a 15 k W wind desalination system was designed according to the fluctuating wind speed of 4 ～ 11 m / s.Based on the change of potential energy and kinetic energy in the wind speed cycle and the output power of the wind turbine,the wind energy capture device is optimized.To achieve the stability of the pressure required for desalination,a high-pressure water tank is introduced into the seawater desalination drive device.Complete the desalination reverse osmosis device design;according to the system output and input voltage requirements,complete the capture control circuit design.Construct dynamic models of each part of the wind desalination system,and complete the research on the performance and control strategies of the wind desalination system based on the dynamic models.Aiming at the problem of wind power capture nonlinearity and wind speed fluctuation,the three-step nonlinear control strategy proposed by Professor Chen Hong is introduced to the maximum power capture of wind energy,that is,the controller design is implemented by steady state control,reference feedforward control and error feedback control.This method effectively improves the dynamic response speed.In order to verify the effectiveness of the strategy,adaptive compensation control and state feedback control are designed respectively,and the control effect is verified through experimental simulation.According to the operating characteristics of the constant operating conditions required by the reverse osmosis membrane group,the three-step control strategy is introduced into constant pressure high-efficiency working condition control and constant voltage full-power working condition control,respectively.The constant pressure control of the high-pressure water tank is achieved by regulating the water supply flow,ensuring that the reverse osmosis driving pressure is maintained at the system’s efficient working point;regulating the valve opening of the brackish water side,controlling the pressure release or boosting in the reverse osmosis system in time,and maintaining the system’s full power operation condition.Build a wind power desalination simulation platform with a design power of 15 k W,conduct model-based comparison experiments of high-efficiency wind energy capture control strategies,seawater desalination chemical condition control experiments,wind energy efficient capture effects on seawater desalination driving experiments,seawater desalination water quality analysis experiments,and seawater desalination Power consumption experiment.Through simulation verification,it is confirmed that the three-step control strategy design controller has the best effect,the dynamic response speed when capturing wind energy is only 3.5s without overshoot,and the reverse osmosis constant pressure high efficiency working condition is under the driving pressure of 4.5MPa The energy consumption of the system is only 4kWh,and the system pressure is stable at 6.5MPa under full power conditions,and the cost is effectively reduced under the premise that the water quality requirements reach the standard. |
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