Application Of Wireless Ad Hoc In Power System Communication

Power system communication is an important and indispensable component, it directly relates to the security, economic, and reliable operation of power system. Recently, with the rapid development of cities and the increase in power users, the scale of distribution network continues to expand, and the position of power system monitors may change at any time. All these situations pose great challenges to power system communication, how to collect monitoring data at low-cost in a multi-point wide range has become an important issue for the power system engineers.Wireless ad hoc network is a group of static or mobile nodes that autonomously form a multi-hop network. The communication between nodes depends on the mutual cooperation to complete in a multi-hop way, without relying on fixed network infrastructure. Wireless ad hoc network also has a higher degree of reliability and flexibility, it can be widely used in military communications and the environments where the fixed telecommunication facilities difficult to establish, such as environmental monitoring and emergency rescue.Aiming to the application of wireless ad hoc in power system communication, this thesis studies the routing protocol as well as the MAC protocol of wireless ad hoc network, specifically, including the routing protocols selection for power system communication, optimization mechanism of MAC protocol, the architecture for power system communication based on wireless ad hoc network and the data aggregation mechanism based on IEEE802.16e. The main contributions of this thesis are as follows:1) The routing protocols selection: this thesis first introduces the characteristics of four typical routing protocols. Then, basing on the requirements of power system communication, we perform qualitative analysis and simulation comparison, and make a choice from the four ad hoc routing protocols. The simulation results provide some reference for power system engineers.2) The optimization of IEEE802.11e EDCA mechanism: IEEE 802.11e standard provides QoS support for real-time business, which is an ideal MAC layer protocol for local power system monitoring network. However, EDCA mechanism does not specify the parameters tuning algorithm, and the use of the default configurations may lead to a waste of wireless channel resources. To solve this problem, this thesis presents a simple and effective strategy for tuning the parameters, Simulation results show that the proposed strategy can ensure the requirement of the real-time traffic, increase the throughput of the best-effort flow and optimize the performance of IEEE 802.11e EDCA mechanism.3) The architecture for power system communication based on wireless ad hoc network: According to the type of monitoring low-voltage distribution network, this thesis proposes an architecture for power system communication based on wireless ad hoc network.4) Data aggregation mechanism: To solve the long-distance transmission problem of the collected data, the IEEE802.16e protocol is introduced. We classify the monitoring data as two kinds according to its importance, and map them to the corresponding services of IEEE802.16e. The simulation results verify the feasibility of data aggregation based on the IEEE802.16e.