| After years of construction,China became a country full of electricity from a country where electricity is scarce.However,in the field of distribution automation,our country is far behind the developed countries.With the beginning of the 13th Five-Year plan,distribution automation will usher in the climax.10kV boundary switch is an intelligent terminal equipment in distribution automation,the boundary switch is a power equipment which is used to control and protect the transmission and distribution of power in the power system.When a fault occurs somewhere on the line,the switch controller can automatically operate the switch to isolate the fault zone and restore the normal power supply of the non fault zone.In order to reduce the cost of communication in the distribution network automation,and due to the complexity of the topology of the user side,the location of the switch is widely distributed and so on,it is not suitable for optical fiber communication so,the public network GPRS is used as the transmission channel between the switch controller and the monitoring system.However,the data transmission via public network is vulnerable to attack,caused a great threat to the power system.In order to encrypt the transmission of data between switch controller and monitoring system,the switch controller and monitoring system should be equipped with a security encryption module,Using a NXP microprocessor LPC1778 as the encryption module control chip.According to the relevant provisions of the state,SM2 elliptic curve public key cryptography algorithm is chosen as the encryption algorithm in this paper.Firstly,the paper discusses the content and working principle of SM2 public key cryptography algorithm.In order to implement the SM2 algorithm,the basic large number operations is designed and tested on the LPC1778 development board.Then,the SM2 algorithm is achieved by using these basic operations.Finally,the secure communication scheme of 10kV switch monitoring system is designed. |
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