几种数字算法的特性分析及仿真-毕业设计（论文）说明书.docVIP

毕业设计说明书(论文) 几种数字算法的特性分析及仿真  Undergraduate Design(Thesis) ANALYSIS OFSEVERAL DIGITAI ALGORITHMS AND SIMULATION BY XUAn-chao Supervised by Lecturer GU Yan School of Electric Power Engineering Nanjing Institute of Technology June 2011  摘 要 微机保护算法是微机保护研究的整点，微机保护不同功能的实现，主要依靠其软件算法完成。微机保护的一个基本问题便是寻找适当的算法，使运算结果的精度能满足工程要求并尽量减少计算。在选择算法时要考虑两个重要问题，即计算速度问题和计算精度问题，而这两者通常是矛盾的，若要精度高，则要利用更多的采样点，相应便增加了计算工作量，降低了计算速度。 本文对微机保护算法综合性能分析，确定特定场合下如何合理的进行选择，并在此基础上对其进行补偿与改进，对于进一步提高微机保护的选择性、速动性、灵敏性和可靠性，满足电网安全稳定运行的要求具有现实指导意义。 关键词 微机保护算法，两点乘积算法，导数算法，半周积分算法，傅氏算法，最小二乘算法，卡尔曼滤波算法  Abstract Algorithms for microprocessor-based protections are Very important in the research on the microprocessor-based protections，for all kinds of functions of protections were achieved mainly by algorithms．To select appropriate algorithms is one of the basic issues of microprocessor-based protections．The algorithms should be precise enough to satisfy the requirements of the definite engineering and the time they consume should be as less as possible．When we select algorithms，we should consider two issues—speed and precision．But the speed is contrary with the precision．In order to acquire higher precision，we will use more sampling hits，which will consume more time and reduce me rate． To study the algorithms for microprocessor-based protections will be useful for us to select an appropriate one and make it improved and compensated in certain situation. It will do a favor to improve the selectivity ,quick-acting, reliability and sensitivity in protections and satisfy the requirements of the electric network operating safely and stably. The study has some certain value of guidance for its application in actual engineering. Key words algorithms for microprocessor-based protections; Two-point product algorithm; Derivative algorithm; Half-cycle?integration algorithm；Fourier algorithm；recursive least square algorithm；Kalman filter algorithm  目录 摘 要 I Abstract II 1 绪 论 1 1.1电力系统微机继电保护概述 1 1.2 微机保护算法的基本原理