| With the rapid development of the national power construction,the scale of the power communication network which supporting the control,operation and management of the power grid continued to expand,and the number of core services also increased.It is gradually becoming a larger,more diverse and denser wide-area network.The above characteristics brought challenges for planning and performance simulation of power communication networks,which are manifested in: 1)large scale requires more storage capacity;2)diverse network requires more complex and more authentic simulation resources modeling;3)highly concurrent data interaction requires better simulation performance.The main bottleneck limiting the packet-level network simulator is the storage amount and time overhead required for the simulation operation.Although distributed parallel simulation or network model simplified simulation can effectively improve the simulation efficiency,they still cannot balance the complexity and authenticity of the simulation.In order to reduce the computational complexity of network simulation and improve the authenticity of simulation,this paper proposes a three-layer network simulation framework,which includes network partitioning,subnet abstraction and joint simulation from bottom to top.By dividing the topology of the wide-area power communication network into multiple local subnets,establishing the mapping relationship between the simulation output and the network application input,the subnet abstract model is constructed,and then the joint simulation of the whole network is realized.The main work and contributions are as follows:1.For the simulation of wide-area power communication network,according to the network architecture characteristics of the power communication network,the essential problems to be solved for wide-area simulation are analyzed,and a three-layer simulation framework for network partition,subnet abstraction and joint simulation is proposed,which can effectively improve the simulation effectiveness.2.Aiming at the problem of network partitioning,combined with the network structure of wide-area power communication network and the distribution characteristics of network communication traffic,a multi-level partitioning algorithm based on weighted label propagation is proposed,which is optimized from network coarsening and partitioning.The experimental results show that the algorithm has obvious advantages in partitioning speed and partitioning effect,and is especially suitable for network with scale-free and small-world characteristics.3.Aiming at the network abstraction problem,a subnet abstract model is established from the aspects of topology abstraction and application abstraction.Based on BP neural network,the mapping relationship between simulation output and subnet service input is established.On this basis,for the two basic topologies such as star and ring,the delay and packet loss data before and after the subnet abstraction are compared and tested.The results show that the average R2 between the simulated output and the actual value of the model is above 0.92,and the average relative error is less than 7%.The subnet abstract model can well represent the actual network service characteristics.4.The abstract simulation system for wide-area power communication network is designed and implemented.The overall framework includes: human-computer interaction service layer,process control and algorithm simulation application layer and the underlying algorithm support layer.5.Based on the designed network abstract simulation system,an abstract simulation of a provincial power communication network is carried out to verify the effectiveness of the simulation system.The results show that the three-layer architecture and method of "partition-abstract-simulation" proposed in this paper can greatly reduce the number of simulation events and speed up the simulation.The simulation method proposed in this paper can effectively realize network partitioning.The subnet abstraction can greatly reduce the occupation of simulation resources,and can cope with large-scale and complex-application network communication simulation.This research work has great value not only in the research of power communication systems,but also in the simulation of other large-scale networks. |
