Research On WSN Secure Communication Method Based On Digital Watermark For Smart Grid

In recent years,wireless sensor network(WSN)has attracted a lot of attention from experts and scholars at home and abroad for its application in power systems due to its low cost,low power consumption and self-organizing network.Therefore,the application research of WSN in smart grid is considered to have broad prospects.Among them,transmission lines are an important part of the power system,and real-time monitoring of its status is an important goal of smart grid construction.Improving the management level of transmission lines and enhancing the reliability of power system operation are increasingly dependent on the status monitoring information of transmission lines.The transmission lines are divided into overhead high-voltage transmission lines and low-voltage transmission lines distributed to users.The user-level low-voltage transmission line is usually connected with a smart meter,which integrates the WSN and the smart meter to realize the function of unmanned meter reading,thereby bringing great convenience to the power department,and when the user's household power line is abnormal,Be able to promptly identify problems and troubleshoot them.For overhead high-voltage transmission lines,it is often distributed in complex and complex environments,so the complex and varied physical environment will have a certain degree of impact on the normal operation of transmission lines,such as excessive wire temperature,voltage and current faults,and wires.After the tension and wire icing failure,the staff can not find the fault point and solve the corresponding problem as quickly as possible.Therefore,according to the actual situation,installing a certain number of sensor nodes with physical sensing functions in a certain area is conducive to timely finding problems,reducing the occurrence of major accidents,and playing a good role in solving the above problems,and can reduce the amount of work for electric power staff.The WSN is arranged on the low-voltage transmission line of the user level for transmitting the power consumption data collected by the smart meter on the user side;and for the WSN arranged on the long-chain distributed high-voltage overhead transmission line,the operation is mainly for the transmission line The status is monitored in real time.The WSN in two different environments will eventually transmit the collected sensor data to the aggregation node or the remote server.Therefore,secure data transmission is a key issue to be solved urgently.Due to the low processing power of the sensor nodes,conventional high-security methods such as encryption/decryption and authentication will prolong the processing time of the node processor,which is unacceptable for real-time data.In addition,due to the high voltage of the transmission line,it is impossible to directly supply power to the wireless sensor node,and the traditional complicated safety method has high energy consumption.To this end,this paper proposes aWSN security solution for transmission lines based on digital watermarking.The method is a digital window generation algorithm based on a time window.The data item generated by the sensor data is collected by each node as the relevant parameter for generating the watermark,and embedded in the corresponding data item,and the receiver extracts and detects the watermark of the data item,and verifies the correctness of the data and the identity of the sending node.Authenticity to ensure that the received data is the true state information of the transmission line.In order to verify the reliability of the algorithm,this paper uses the NS2 network simulation platform to simulate the correctness,effectiveness,security,node throughput and energy consumption of the algorithm.The method is safe and less.Energy consumption,no impact on network throughput,and correctness and effectiveness can be fully guaranteed to meet WSN secure communication in transmission lines.In addition,the algorithm time performance analysis proves that the algorithm has less time overhead and meets the real-time requirements of WSN communication in transmission lines.