Research On Optimized Routing Protocols In Wireless Sensor Networks Oriented To Smart Distribution And Utilization Grid

As the goal and direction of the modern power grid construction, a modern power communication network is essential for the realization of smart grid. The conventional power communication network can not meet the needs of various power communication business with growing complexity nowadays. With the characteristics of low-cost, low energy-consumed, self-organization, flexibility, reliability and scalability, the utilization of wireless sensor networks (WSN) in smart distribution and utilization grid (SDUG) is becoming a hot spot of research at home and abroad. Supporting the SDUG with reliable communication technologies, adopting WSN as supplement and extension of communication network in SDUG is essential. Analyzing the communication services and carrying research on optimizing design of routing protocols in the specific network model is significant. Under the above background, this paper studies aiming at different quality of service (QoS) of communication services to propose corresponding optimized routing protocols, with the application background of introducing WSN to SDUG as necessary supplement and extension. This work supports the QoS guarantee of service transmission in the SDUG communication network.The QoS support of communication service in SDUG is a basic problem for building communication network by using wireless sensor network, it involves data sense of node, transmission quality of network, demand of energy consumption, quality of network coverage and network service time, et al. Among which, the essential issue of network transmission quality is the selection of data routing scheme, which undertakes a task of transferring data from source node to sink node properly under certain constraints. Aiming at this problem, it is mainly studied from three aspects in this paper:first, the routing schemes based on chain topology are studied. Second, the energy optimization problem in the next-hop selection of multi-path routing protocol is discussed. Finally, the routing protocols based on congestion control are proposed. The main work of this paper is as follows:On the basis of analyzing various characteristics and QoS demands of communication services in the SDUG communication network, the issue of routing method selection in specific application scenarios is studied, which lays a foundation for the research on optimized routing protocols in WSN.Aiming at the topological features of WSN in feeder line monitoring system, the optimized routing protocols based on chain topology are studied. The energy-efficient PEGASIS-based protocol (EEPB) is a chain-based protocol which has certain deficiencies including the uncertainty of threshold adopted when building a chain, the inevitability of long link (LL) when valuing threshold inappropriately and the non-optimal election of leader node. To solve these problems, an improved energy-efficient PEGASIS-based protocol (IEEPB) is proposed in this paper. IEEPB adopts new method to build chain, and uses weighting method when selecting the leader node, that is assigning each node a weight so as to represent its appropriate level of being a leader which considers residual energy of nodes and distance between a node and base station (BS) as key parameters. Moreover, an energy-efficient algorithm based on triangle module fusion operator (EETMO) is proposed. EETMO adopts new method to build chain, and establishes membership functions of nodes residual energy and distance between a node and base station respectively, uses the fusion method of triangle module operator to determine the leader node selection. Experimental results show that EETMO has a better performance than EEPB on balancing energy consumption and prolonging lifetime of wireless sensor network.In order to reduce overall energy consumption and prolong the network lifetime of WSN oriented to SDUG, an energy efficient routing algorithm based on radar chart (EERC) is proposed. This routing scheme adopts multiple individual metrics to determine the selection of the next hop, which contains the node residual energy, the distance from the node to the sink, and the distance between the node and its neighbors. Then a comprehensive evaluation model for alternative nodes is built based on radar chart. Finally the node with maximum evaluation value is selected to be the next hop. In addition, to solve the problem of using a single routing method and insufficient dynamic adjustment ability in existing energy-efficient routing algorithms for wireless sensor networks, a novel routing algorithm is presented in this paper, which turns the selection of next hop into a multiple criteria decision making (MCDM) procedure. First of all, the concept of potential energy in classical physics is introduced to create a hybrid virtual potential field, then chaos genetic algorithm is adopted to optimize the weight of each potential field, so that the data packet is forwarded to the next hop driven by the joint force generated from the hybrid virtual field and finally reaches the sink.As the supplement and extension of the communication network for intelligent power utilization, wireless sensor networks with the characteristics of centralized traffic pattern are prone to congestion, which affects the quality of service for communication business. To solve this problem, a congestion control routing algorithm is presented in this paper, which turns the selection of next hop into a multiple criteria decision making procedure. First, a hybrid virtual potential field is established by using the concept of potential energy in classical physics, then the chaos immune algorithm is adopted to optimize the weight of each potential field, and then the joint force generated from the hybrid virtual field make the data packet forwarded to the next hop avoiding congestrion and arrived at the sink finally. Moreover, a congestion avoidance routing algorithm based on fusion judgment (CARF) is presented. This algorithm builds membership function according to the evaluation parameters of node queue length, residual energy and distance between node and sink, then makes fusion judgment and selects the next hop by the final result.This paper focuses on the issue of routing protocol optimization in wireless sensor network oriented to smart distribution and utilization grid. Aiming at different QoS requirements in specific environment of SDUG, the corresponding optimized routing protocols are proposed, and their effectiveness are validated through simulation experiments.