在现代电力系统广域保护和稳定控制系统中，同步相量测量单元（PMU）起着重要作用。目前应用于我国电网中的PMU大都是基于美国全球定位系统（GPS）提供的授时信号来实现同步数据采集的。从保障互联电网的安全出发，文中提出了基于我国“北斗一号"卫星定位系统来开发适合我国电网的PMU，并论证了该方案的可行性。

针对目前电力系统载波通信的现状，提出了一种基于编码正交频分复用调制技术的高压电力线载波数字通信系统，并讨论了COFDM系统中关于峰均功率比、同步、信道抗干扰编码问题及相应的解决方法。文中还通过计算机仿真测试了所提出的数字通信系统的误码率（BER）性能，取得一个比较好的结果，仿真结果证明该技术适合在高压电力线信道进行高速数据通信。

In this paper, a Power Line Carrier (PLC) communication system using a type of coded rthogonal frequency division multiplexing (COFDM) modulation is presented. Some application problems of the COFDM system are discussed. Key scheme of RSiTCM concatenated coding can correct errors. The performance of the proposed system with parameters is investigated through computer simulation. A good hit error rate(BER) result is observed.

光纤架空复合地线（OPGW）中故障电流的计算是其设计选型中的一项重要工作，针对OPGW工程计算中常遇见的两个问题所带来的计算误差：忽略经变压器中性点通过变压器线圈流向导线的电流及忽略导线系统与地线系统的互阻抗，提出一种基于EMTP软件的电磁暂态计算方法：该方法可以有效地解决上述问题，准确度较高。

The paper introduces the basic structure and equivalent circuit model of Unified Power Flow Controller (UPFC) in the beginning, and then analyzes its effects on transmission line distance relay in two cases. Different location of the UPFC, the fault resistance, the parameters of UPFC, the location of fault and system operation conditions will all affect the measured apparent impedance to some degree. The presence of UPFC will make the relay under-reach or over-reach. In order to eliminate the effects of UPFC device on protective relay, two methods are given in this paper. One is to equip protective relay devices in which the UPFC device is equipped. In this way the UPFC device is always beyond the fault loop. The other is to use Artificial Neural Network to eliminate the effects of UPFC device.