国内低压电力线载波通信应用现状分析

详细分析了国内外电力线载波通信应用背景和发展历程,对现有载波通信技术路线进行了归纳,对国内主流载波芯片厂家的产品做了介绍,并针对现有技术的不足,提出了未来芯片技术的发展方向和需要解决的问题。     

Design of Capacitor Bank in Parallel to Photovoltaic Power Plant

The purpose of the paper is to develop a solution for application of PV （photovoltaic） generators in MV （medium voltage） distribution system without unacceptable voltage changes due to drops of PV power output. The proposed solution includes operation of PV with predetermined leading power factor and addition of a capacitor bank in parallel to PV plant in order to compensate the reactive power absorbed by the PV inverters. The analytical expression of required power factor angle is derived. Adding a capacitor bank in parallel to PV power plant may pose a problem because of space limitations. The dimensions and cost of small MV capacitor banks depend significantly on the capacitor bank protection against internal faults. Application of the developed negative-sequence current difference method for the unbalance protection of the capacitor banks enables to achieve a compact and cost-reduced design of the banks connected in parallel to PV power plants. A real-world example of operation of the PV plant in parallel to the capacitor bank with the novel protection scheme is described.     

水下电力载波双向通信衰减分析研究

水下电力载波通信是水下复合电液控制系统的主流通信方式之一.为保证数据传输可靠性,需重点关注不同频率下电力载波通信方式的信号衰减问题.基于中海油某气田开发项目,文章利用MATLAB的可视化仿真工具Simulink搭建了水下电力载波通信系统的分析模型,对不同频率下传输信号下行(主控站至水下控制模块)及上行(水下控制模块至主...     

典型电力业务终端的通信接入网选型研究

为了满足多种电力业务终端数据传输需求,建设双向、安全、可靠、灵活的通信接入网络是最关键环节之一.文章分析了典型电力业务终端的通信质量需求,探讨多种有线/无线通信技术在电力终端业务中应用的可行性.为了建立通信技术与电力终端业务的耦合量化关系,设计了一种多属性综合通信技术指标与电力终端业务需求的数值匹配算法,解决电力通信接...     

Development and Implementation of GSM-Based Distribution Automation System with Graphic User Interface in Nigeria Electric Power Distribution Network

Lack of up-to-date information on efficient operation and maintenance of EPDS （electric power distribution systems）, Nigeria is addressed by designing and implementing an indigenous real-time monitoring and diagnosis system. The system encompasses the development of software driven hardware positioned at the remotely located sub-stations at the low voltage level to keep track of the network in real-time. The detection of faults exploits threshold passing algorithm through continuous monitoring of the network power quality. Communication between the RTU （remote terminal unit） and the DCC （distribution control center） which is based on GSM is initiated by disturbance. The DCC performs fault evaluation processing using the received data and predetermined faults signatures to determine the nature of disturbance and presents the result in graphic user interface environment. A fault reporting time of 2 s was achieved. The developed system exhibits a high degree of accuracy and manifests no spurious reports during testing. The resultant system limits the effects of interruption and increases power availability by reducing the down time. The system strengthens engineering and management capabilities required to enhance reliability by providing information about the network health status.