【作者】 王世勇；

【导师】 孙鸣；

【作者基本信息】 合肥工业大学 ， 电力系统及其自动化， 2007， 硕士

【摘要】 随着电力系统规模的不断扩大，高压电网迅速发展，对输电线路保护和测距装置提出了更高的要求。目前运行的微机保护装置的CPU大多数还是采用16位单片机，由于其处理速度慢，不易实现更强的保护功能。研究和开发高性能的微机保护平台具有重要的现实意义。论文首先对继电保护发展历史和研究现状以及新进展进行了综述性介绍，在此基础上建立了基于DSP(Digital Signal Processing)TMS320F2812的新型微机保护平台，从高压线路的运行要求和现场实际需要出发，研制了一套110kv线路保护装置。论文重点阐述微机高压线路保护的软件和硬件技术方案及其实现，文中重点分析了距离保护的算法，数字滤波器，距离保护的振荡闭锁，故障选相原理，故障测距等。在微机保护算法方面，距离保护采用长短数据窗相结合的R—L模型算法，对短数据窗采用“N取R”方法，提高保护的可靠性，兼顾了继电保护速动性和可靠性的要求，在微机保护故障测距理论方面，将一种新型的基于参数识别和最小二乘法的精确故障测距方案引进保护，并验证了它的有效性和可靠性。该微机线路保护装置动作速度快，可靠性高，完全满足110kv线路保护的各项需要。更多还原

【Abstract】 With the increasing scale of electric power system and the rapid development of high voltage power grid ,there are higher standard requirements about transmission line protection and fault location. The CPU of most microprocessor-based protection device at present is 16 bit Single Chip Micyoco, because of its slowly processing speed, it is hard for the Single Chip Micyoco to implement the more complex protection function.so there is important practical meaning to research and develop microprocessor-based protection device of higher performance. After synthetical presentation of developmental history and current research result of microprocessor-based protection devices, the paper bring forward a new kind of microprocessor line protection device based on DSP (TMS320F2812) .the paper emphasize the analyzing of algorithm of distance protection, digital filter , power system swing block ,selectivity of faulty phases and transmission line fault location and so on.As to the algorism of microprocessor-based protection, the distance protection utilize the algorism of R-L model that combines the short data windows and long data windows. And the paper use the method of "R out of N" to increase the reliability of the protection. This method take into account both the speed and reliability. As to the algorithm of transmission line fault location, the paper adopt an accurate faulty location algorithm for transmission lines based on R-L model parameter identification and least-squares algorithm,and testify its validity and reliability.This DSP-based protection device has the characteristics of high speed and reliability. It can meet the requirements of 110 kV transmission line protection.更多还原