The Research Of Centralized Management And Control System For Electric Power

Along with the continue developing of universities and colleges reform in the logistics service depending on the socialization, electricity management has adopted giving payment before using electricity in the student boarding house .Therefore a kind of new electric power system for centralized measurement, management and control is needed urgently. At present, the centralized management and control system for electric power is still in the initial developing stage. It has many problems also. This paper expounds the design and development of centralized management and control system for electric power applied to the student boarding house of colleges and universities. It was worked out after looked up a lot of internal and external related technical literatures and based on the serious survey of internal similar production.Firstly, the paper carefully analyses the principle to measure electric power, then determine system circuit parameters, develop and design the system hardware and software according to the system performance index. The main design parts in the hardware are sampling circuit of electric power, data acquisition and processing circuit of monolithic computer, display circuit and bus circuit. In the design of sampling circuit, a new debugging method for accuracy was developed. That is using precision resistor takes place the traditional short-circuit ring. Electric power A/D conversion circuit does the accumulating operation of electric power measurement within the chip to the sampling signals of current and voltage which are got from the sampling resistor made of manganin and realizes A/D conversion function within the chip, then provides the pulse mode output for monolithic computer to data processing. Adopts the bus mode to realize the function of transmission and control among all kinds of control information and data information come from 16 rooms in one monolithic computer subsystem. 485 Interface communication was adopted between each subsystem of monolithic computer and uppercomputer. The memory with I2C bus interface and serial LED display technique are also adopted in this system.This paper describes the design about the main functional modules of system software in great detail. The main introduction is work flow of main program module, communication module, display module, measurement module, load detecting module and distribution plan of system resources. It is a new created point of system design that using software to realize the load detecting. The simplified communication protocol is set up based on the practical need. By using back-up stored data, software trap and other methodes, the anti-interference ability and safety of the system is increased.The centralized management and control system for electric power has many functions, such as electric power measurement, load testing, auto-switch control, data statistic, data statement, printing and etc. It has good and applied foreground. The potential market needs is enormous.