Design And Experiment Of Pond Eccentric Hydrodynamic Equipment Control System

The flow of water is the basis for water purification in aquaculture ponds,and it is of great significance to develop and optimize the research and development of high efficient hydrodynamic formation equipment.Based on the development status of pond aquaculture and the low energy consumption eccentric hydropower equipment designed for water quality regulation.this paper studies the control algorithm based on the need of aerobic and hydrodynamic balance operation,and finally designs the hardware and software control system.The eccentric hydrodynamic equipment control system takes the STM32 microcontroller as its core,conducts on-site environmental feedback through dissolved oxygen,temperature and pH values,and uses solid-state relays to achieve weak current control and strong power.The control system uses a LCD display,a buzzer alarm,keys as a human-computer interaction method,local data storage through the SD card,and 4G uploading an online platform.The integrated control test of the hydrodynamic equipment control system was carried out at the Chongming Dongfeng farm breeding base in Shanghai.The results showed that the design of the hydrodynamic equipment control system has good stability and reliability,and has the value of further promotion in the pond aquaculture industry.The research contents and achievements of this paper are as follows:(1)The overall design of the control system.The working principle of water lifting,water breakage,and water pushing for the eccentric hydropower equipment was analyzed,and the design and calculation of the hydrodynamic force formation and aerobic balance work were performed.The water quality data acquisition,data processing,data storage,and data communication were determined.The system consists of functional modules such as motor status feedback,alarm mode,and strong and weak electrical safety control.According to the needs of basic control and calculation capabilities,the STM32F427 chip is used as the core for control board design.(2)Control demand analysis and control algorithm design.A number of target coordination control mechanisms were studied to analyze the oxygen generation and hydrodynamic formation modes of the eccentric hydropower equipment.Combined with the effective working water dynamic formation requirements of biofilms,the energy consumption problem was considered and single,three,and different time parameters control mode were designed.Based on the law of pond material energy circulation,using DO(dissolved oxygen),temperature,and pH as input,BP neural network algorithm was used to predict ammonia nitrogen and incorporate it into the control system.(3)Control board hardware system development.According to the requirements of 380 V and 1.5kW AC motors for control objects,combined with board design rules,the hardware core system includes CPU,FLASH memory(1M),SRAM memory(192KB),crystal oscillator(25MHz),timer,Reset,etc.Logic design and simulation,the principle design of each module circuit based on RS458 interface DOS-600 dissolved oxygen and DPS-600 pH sensor,SD data storage and SIM900 A communication system,human-computer interaction system,etc.,to further complete the PCB diagram design,circuit board processing and debugging.(4)Design and development control system software.Based on the hardware basis,the overall architecture of the algorithm is built,including the construction of multiple target coordinated control of different working modes,sensor data reading and storage for autonomous calibration and data discrimination capabilities,and the program design for remote communication,presented by the YB19264-ZA type LCD screen.The design of the human-computer interaction system with different interfaces in the five-layer menu,the LCD screen is displayed in four lines,and one line can display twelve Chinese characters.In addition,the human-computer interaction system also includes six button programming.Keil μVision 5 software was used to debug and optimize each module program to complete the software development of the control system.(5)Comprehensive test and data analysis of control system.The Dongfeng breeding Farm of Shanghai Guangming Group was selected as the test base,and the system was improved and optimized based on the actual conditions of the site,including system stability and reliability verification under severe weather conditions such as thunder and lightning.The main results of the test completion include: firstly,verifying the reliability of the system after the eccentric hydrodynamic equipment and its control system are put into use,and obtaining long-term water quality data,ammonia nitrogen parameters,etc.using control algorithms and prediction algorithms.Second,with the requirement of 3～5mg/L dissolved oxygen,the energy consumption of this system is lower than the manually controlled hydrodynamic equipment by more than 25%.The ammonia nitrogen index experiment pond averagely decreases by 24.8% with respect to the upper outlet of the control pond and the downwind outlet decreases by an average of 16.25%.Third,based on the principle of pond energy circulation,biofilm was used for water purification.Combined with the analysis results of water quality sampling,it was proved that the control system of eccentric hydrodynamic equipment played a good role in the purification of pond water quality.