| With the development of the power system,the wide area measurement system(WAMS)with synchrophasor measurement unit(PMU)as the core component plays an increasingly important role in the dynamic monitoring,wide area protection,and system control of modern power systems.The development of communication technology has improved the considerable controllability of the power system,but it has also laid potential safety hazards for the power system.Loss or errors of measurement data caused by network attacks in WAMS will affect dispatchers’ accurate perception of the primary system of the power grid,and seriously affect the stable operation of the power system.Therefore,it is very important to ensure the observability of the power system under network attacks,and it is of great significance to improve the ability of WAMS to resist network attacks.This paper takes the PMU measurement network as the main research object,and investigates the impact of network attacks on the observability of the system.In order to improve the ability of WAMS to resist risks,this paper studies the joint configuration scheme of PMU and its communication network.Taking economy and effectiveness as the starting point,the communication network is optimized by means of pre configured cycle(P-Cycle)protection and the introduction of SDN to improve PMU communication.The resilience of the network ensures that WAMS can operate stably under network attacks.The main work is as follows:(1)Improve the survivability of communication services under network attacks by introducing P-Cycle into the communication network,define the availability of synchrophasors based on the Markov state transition process,and describe the state of power lines and communication routes under network attacks to the power system.Observational effects.Aiming at the minimum installation cost,a mathematical model for joint optimization of communication link and PMU configuration is constructed,and an improved genetic algorithm is proposed to solve the model.Finally,the experimental analysis is carried out under the IEEE14 and IEEE30 node systems.The experimental results show that the availability of the synchrophasors defined in this paper can better describe the observability of the system,and the P-Cycle protection method can cost-effectively improve the performance of WAMS against network attacks.ability.(2)The software-defined network(SDN)architecture is introduced into WAMS,and the survivability of communication services under network attacks is improved through dynamic multi-routing.Combined with the dynamic multi-routing function of SDN,the synchrophasor availability evaluation method is improved based on the Markov state transition process,and the ability of WAMS to resist network attacks under SDN multi-routing communication is described.Aiming at the minimum installation cost,a mathematical model for joint optimization of PMU configuration and communication network under SDN is constructed,and the model is solved by an improved genetic algorithm.Finally,the experimental analysis is carried out under the IEEE14 and IEEE30 node systems.The experimental results show that the multi-route communication under the SDN architecture can effectively improve the synchrophasor availability of the system and improve the ability of WAMS to resist network attacks. |
