P-Cycles Algorithms In Electric Power Communication Networks

In recent years, there has been a boom in the development of electric power communication network along with the continual enlargement of power grid interconnection scale and unceasing growth of intelligent construction. It has generally been recognized as one of the key links of strong smart grid. As a result, more and more electric power business needed to been transmitted by communication network. In order to guarantee the reliability of transmission, especially when the network breaks down, how to build a steady and reliable communication network is a very important task in the future. Therefore, the survivability of electric power communication network has become more urgent. Preconfigured cycle (P-cycle) has been receiving attention because of their superior mesh-like efficiency with ring-like switching speeds and the capability of multi-links failures recovery, which can provide much more flexibility for survivability of optical network, is very suitable for the electric power communication network.In this paper, the main contents of overall framework, service network and networking technology are discussed. By analyzing and comparing the main survivability technology in existence, two novel p-cycle algorithms are presented. One p-cycle algorithm named Shared Risk Link Groups (SRLG) weighted p-cycle algorithm (SWCA) is proposed by considering the diversity of different fiber core of communication link. The minimum protection capacity is defined as optimum objective function, and thus optimizing the effective resource utilization efficiency in the electric power communication network. This algorithm configurate the optimal protection set with the constraints of completely separated SRLG, which achieved partly multi-failure protection and restoration under dynamic traffic. The other p-cycle algorithm named p-cycle-fast reroute (FRR) hybrid algorithm is presented by considering the requirements of diversity of different electric services. This algorithm guarantees fast restoration of higher level service in a short time by setting different protection technology according to the business priorities.Simulation results show that the proposed algorithms can provide partly multi-failure protection and restoration by adding an amount of spare capacity, which makes the algorithm be superior to others in resource utilization. Meanwhile, the p-cycle algorithms can be used as real-time service protection and restoration for its fast protection switching, thereby enhancing the survivability of the electric power communication network.