Software Research And Design Of Embedded Control Device Of The Electric Voltage & Frequency

With the development of the economy and the society, electric power has become one of the most nessesary secondary energies of national economy and people's living.When large power supply accidents appear, the system power loses balance,the frequency or voltage or they two declines.In these situation, voltage & frequency control devices,which also named UVLS & UFLS devices,are used to maintain the stable and secure operation of power system.Expressly,large accidents appear at home and abroad in recent years,people pay more and more attention to the safe stability of electric power system.Traditional UFLS&UVLS devices are based on single machine system, such as 8 or 16 bits single chip machines, with low precision, simple man-machine interface and incomplete closedown conditions in software, so they can't meet the demand of transformer station integrated automation construction.After looking up a great deal of literature data at home and abroad and studying existing UFLS&UVLS devices,A new voltage & frequency control device based on DSP embedded system is developed to change the current situation,which is the escalation and integrity to the current like device.This thesis analyzes the operation principle of voltage & frequency control device and studies the action criterions and closedown conditions of UFLS & UVLS device.Then it introduces the related knowledge of the embedded system and introduces characteristics and its application of the high performance DSP processor TMS320F2812 of TI company. An embedded developing platform based on the DSP microprocessor and the real-time operating systemμC/OS-Ⅱis set up.Further more,this thesis analyzes the core structure,task management , time management,memory management ofμC/OS-Ⅱand how to embedμC/OS-Ⅱin TMS320F2812,then implements to embedμC/OS-Ⅱin TMS320F2812.The software system based onμC/OS-Ⅱis designed,including main program, initializer, data acquisition task, data processing task,action recognition task,display task, keyboard task and communication task,etc.The software design adopts modular and structured programming approach,so its flow is clear. Also, it adopts LCD to design multilevel menu, which based on Chinese characters and graphics,so the device includes perfect function, simplicity of operator,good interface,and convenient communication. The embedded voltage and frequency control device based on DSP TMS320F2812 can realize the request of power system developing in our country, with high precision, high reliability and high stability,so it can be used in power system protection.Because the device adopts the microprocessor of high performance and real-time operating system,it is favorables to fuether development, and owns vast application.