The Design Of Microprocessor-based Protection Based On μC/OS-Ⅱ And DSP

With the development of microprocessor relay protection, many new relay principle and project that can improve the efficiency of the relay protection have been applied in practice, they put forward more higher requirment for the design of microprocessor relay protection. The CPU of most microprocessor-based protection device for the present is 16 bit Single Chip Micyoco, because of the slow speed, it is hard for the Single Chip Micyoco to relize the complex arithmetic and higher sampling. And traditional flow chart linearity programme is adopted in most microprocessor-based protection device for the present, which makes some problems such as hard maintenance, hard upgrade and etc. Based on broadly collecting the documents aboutμC/OS-Ⅱand DSP TMS320VC5402, this paper brings up new microprocessor relay protection hardware and software platform's project and design. μC/OS-Ⅱ is a cost-free and open code, fully preemptive real-time kernel based on static priority. This paper first analyzes μC/OS-Ⅱ kernel principle and performance in details and then ported it to DSP TMS320VC5402 board by writing some hardware-associated code. Furthermore some testing and analysis onμC/OS-Ⅱ are made. Then, the hardware and software of the design are designed. Two high speeding DSP are applied in the main board, one for sampling and calculation and other for logic processing. In the end, the paper analyzes the software design based onμC/OS-Ⅱin details, because of adopting software modularity, the structure of software design is in focus. Each module can be designed simultaneity for different developer, so the efficiency can be enhanced. Since each module is complete independence, the module can be well association with another, which improved the reliability of the system. The paper analyzes the software design and the partition and design for module of protection in detail, and how to create and synchronize tasks is also discussed. In the end the protection scheme and arithmetic are discussed in the paper. In the end, the real time of the software design is analyzed, and the result is satisfaction.