Monitoring and Control System of Variable Frequency Aeration Based on PID Control

Efficient control of DO may increase energy savings, improve productivity, and enhance sustainability for aquaculture. A new monitoring and control system of variable frequency aeration based on PID has been designed. It can real-time monitor environmental parameters such as PH, DO, temperature, and the height of water. In addition, it can control DO in time. According to the actual changes of DO, the frequency converter automatically controls the aerator’s work. The experiment indicates that the relative error of sensor’s measuring DO is controlled in ±1.3%.The system works stably and achieved the function that it can collect environment data automatically, and manage data in real time.