The Research And Design Of Small Hydro Unit Speed Control System

Hydroelectric system is a complex system in which nonlinear aspects, it is difficult to express in conventional mathematical expressions. So, we were looking for a both simple and accurate, not only meet the static performance requirements engineering, and has good dynamic performance, we found that in practice, many hydroelectric unit of the stepper motor speed control system after a period of time, there is a great possibility of being burned, the study found, primarily because the control algorithm is complex, making malfunction, rashness too many times, causing the stepper motor at each speed the process heat is too large, then summarizing the previous basis, focusing on the control algorithm based on nine point control algorithm S7-1200 PLC turbine governor.This paper describes the development process of the turbine governor system, and then separately on the mechanical speed governor hydraulic, electrical, hydraulic type governor and computer type(PLC) governor made a brief introduction. And existing turbine governor control strategy made some lists. Focused on microprocessor-based control system, analysis of the various components of the governor general microprocessor-based systems. Also discusses some of the intelligent control algorithm, with emphasis on the mathematical model of nine point control algorithm, and according to the characteristics of each part of the turbine units, build each module inspired by a fuzzy control resulting in the above basis, the detailed analysis of the some of the features nine point control algorithms, and the possibility of the group should be in the turbine speed control system, finally compared with PID controller and gives the simulation model and the waveform.Based on the above analysis of the results of the past, the latest in a Siemens PLC S7-1200, based on this section of the PLC governor held a general design. According to the characteristics and S7-1200 governor, configuration of I / O port resources, given the hardware connection diagram, and CAD drawings, moreover, gives the software flow control algorithm based on nine point control algorithm, Finally part of the ladder.In this paper, the research and design of small hydro unit speed control system has certain reference value for the new intelligent control algorithm is applied to the actual production also has some reference experience.