Research On Power Grid Data Security Based On Blockchain Technology

As technology continues to develop,the traditional power grid has been transformed into a smart grid that integrates the traditional power network and many advanced technologies.This improves the ability of power supply,but also greatly increases the complexity of the power system,making it more and more difficult to maintain the stability of the power system.Grid data storage is an important part of the smart grid,which supports the normal operation of the system.Traditional centralized data storage methods are vulnerable to malicious network attacks or failures due to downtime,which may cause security issues.Blockchain technology,due to its data immutability and traceability,may be used for grid data protection to resist cyber attacks and provides a new idea to solve the current grid data storage.This thesis analyzes the traditional data storage methods and proposes a power grid data storage system based on the consortium blockchain combining the advantages of blockchain technology for data storage safety and high fault tolerance.The proposed system designs a new consensus algorithm which can support high throughput.At the same time,in regard to the problems in the view conversion process in the commonly used PBFT consensus algorithm in the consortium blockchain,this thesis proposes a view conversion method based on smart contracts to improve it.This thesis mainly does the following work:(1)Analyzes the shortcomings of the data storage methods in the traditional power grid,and proposes a new scheme of data storage for grid based on consortium blockchain combining with the anti-tampering and decentralized characteristics of the blockchain technology.It improves the difficulty for hackers to invade the power grid data storage system successfully,and also enhances the security and fault tolerance of power grid data.(2)Aims at the shortcomings of the previous consensus algorithms in the consortium chain which causes it cannot be applied to large-scale systems,an improved Byzantine consensus algorithm based on multi-signature(MSBFT)is proposed.The scalability and consensus efficiency of the system are improved.Besides,the throughput and operating efficiency of the system are improved.(3)Owing to the problem that the view conversion process in the traditional Byzantine-like consensus algorithm is too complicated and inefficient,a smart contract-based view conversion method is proposed combining with the application scenarios of the grid data storage system.The original algorithm has been optimized and improved to simplify the view conversion steps,thereby improving the efficiency of the view conversion process.A simulation system is designed and the results are displayed,which proves the superiority of the proposed method.