【作者】 彭静；

【导师】 卢继平；

【作者基本信息】 重庆大学 ， 电气工程， 2009， 硕士

【摘要】 电力系统结构复杂性地快速上升和电力体制改革地进一步深化,使得电力系统的安全稳定运行面临严峻挑战。大区域电网互联的实现能够提高整个电网的可靠性和稳定性,是当前电力系统发展的趋势,它对通信基础设施、控制技术、运行策略以及对灾变的预防和控制能力都提出了更高的要求。本文研究了基于全球卫星定位系统(GPS)高精度定时技术的电力系统广域测量系统(WAMS)中实时数据通信的相关问题。目前,电力系统通信网络结构薄弱、容量不足,难以满足WAMS捕捉电力网实时动态信息的要求。为了满足WAMS实时决策和紧急控制对实时性和可靠性的要求,本文结合工程思想,从物理媒介、骨干网络、组网技术、协议体系等方面对WAMS通信网络平台进行了分析设计。其中网络设计采用复合网络拓扑,通信协议采用IP协议,组网方式选用IP over WDM。并对网络延时进行了分析以确定设计的通信网络平台能够满足WAMS对实时数据交换的要求。为了掌握WAMS通信网络的安全程度,了解加强网络安全保障工作重点在哪里,确定已采取的网络安全措施是否有效,需要对WAMS通信网络进行风险评估。本文根据WAMS通信主干网的特点,以一个4节点2纤双向通道环网为例,通过定性分析和定量计算相结合的方法,提出了WAMS通信主干网的风险评估模型和计算方法。该模型将风险评估涉及的资产、威胁、脆弱点和风险影响4大要素有机融合。根据可靠性的成熟理论计算风险事件发生的概率,借鉴层次分析法中构建比较判断矩阵实现风险影响值的量化计算,从而得出通信主干网的风险综合值。计算结果表明本文提出的方法具有良好的实用性和可操作性,可用于后续的评估工作,并为制定安全保护策略提供了依据。更多还原

【Abstract】 Power system structure rapidly increased in complexity, and it deeply reformed. The power system safe and stable is facing severe challenges. Large regional power grid interconnection implementation can improve the entire power grid reliability and stability. Large regional power is the current trend in power system. It put forward higher requirements in communications infrastructure, control technology, operating strategy, as well as disaster prevention and control.This paper discusses the real-time data communication problem in the GPS-based power systems wide area measurement system (WAMS). Because of the weakness of the structure of power system communication network and lack of trunk transmission capacity, it is difficult to capture real-time dynamic information of power grid to meet the requirement of WAMS. To meet the real-time and reliability requirements of real-time analysis and emergency control of power systems, this paper analyzes and designs the WAMS communication infrastructure which are from physical medium, backbone networks, network technology and communication protocol. In this method, the multi-Ethernet protocol is adopted in communication net design. The IP protocol is used as communication protocol. The IP over WDM is used in network model. The net delay is also discussed. This communication scheme that meets the demands of real-time data exchange of WAMS is proposed.In order to command the safety degree of the communication network of WAMS, and to identify where to be strengthened, and to guarantee the safety of the network, we should do risk assessment for the communication network of WAMS. A mathematical model for risk assessment to communication backbone networks (CBN) in WAMS was proposed. Considering the self-healing and ring structure characteristics of CBN, this paper gave a theoretical analysis to the model based on a typical ring network with 4 nodes and 2 optic fibers and double-direction, dual-passage through integrating qualitative and quantitative analysis. This model combined the four main factors of risk assessment together: assets, threats, vulnerabilities and risk impact. In order to get the final comprehensive risk value, the risk events probability and the risk impact value were calculated by Reliability Analysis and a comparison matrix which is borrowed from Analytic Hierarchy Process (AHP), respectively. The results show that the method has a good operability and practicality, which can be used for follow-up assessment, and provides a basis to establish the security strategy for power systems.更多还原