Construction Of Excitation Controller With μC/OS-Ⅱ System For Rural Hydropower Station And Real-time Characteristics Study

With the rapid development of embedded technology, it has been widely used inmany fields and becoming more and more intelligent. The prospects of hydropower isflourishing in China. Many medium and small hydropower generator sets need to beupgraded in order to realize the automation and informatization and fulfill the goal ofunattended operation. Currently the excitation system rarely adds the real-timeoperating system, mainly controlled by cabinets, merging with monitoring andoperating through manual. We try to transplant μC/OS-II real-time operating systemkernel into the new excitation control system designed by us.The new excitation control system uses LPC11c14which is the latest series ofCortex-M0from ARM, with powerful function, strong expansibility and sufficientFlash.Each of the main modules such as synchronized trigger, phase shift, impulsedistribution and so on have been designed, constructing the perfect functions and highreliability excitation controller system.The μC/OS-II is an open source real-time kernel, which is applied more andmore widely. It has several advantages such as little amount of code, full function,high real-time performance, multi-tasks scheduling. However, there are somedeficiencies, especially the limitation of the in the task scheduling. In this paper, wemake our deeply research onμC/OS-II kernel, improving the disadvantages ofmonotonous scheduling strategy and limited tasks on task scheduling algorithm, anovel strategy of mixture-scheduling-strategy possessed of task-module and sub-taskis proposed and make some improvement with kernel. For each of operations in theexcitation controller without real-time operation system is certain and executesubsequent, each of operations is modularized to schedule after merging μC/OS-IIsystem. The real-time characteristics may reduce in a sense compared with the formerexcitation control system, we will evaluate the real-time characteristics throughexperiments and field tests.There are several advantages of the new excitation control system withμC/OS-II, listed as follows: user-friendly interface, remote control, multi-taskoperation and so on. At the foundation of rich functions, the real-time characteristicsand stability are not loss, and the user can add and modify the task autonomously.We get the conclusion that the new system merged with μC/OS-II kernel can realize intelligence, aiming at the goal of unattended operation, what’s more, the extratime consumption is tiny without adverse consequences. It is meaningful that mergingreal-time operation system into excitation control system, which is a new designapproach.