Communication method of power management system

Abstract

The invention relates to a communication method of a power management system. The power management system is compatible with a DL / T645 protocol, and a second key is stored in the master station, so that the master station can carry out a second encryption operation; and a first key is stored in the slave station, so that the slave station can carry out a first encryption operation. The communication process between the master station and the slave station comprises the following steps: the master station and the slave station exchange the random sequence; the master station carries out the second encryption operation with the second key according to the random sequence to generate a second password used for operating the slave station; the slave station carries out the first encryption operation with the first key according to the random sequence to generate a first password; and the slave station compares the first password and the second password to check whether the identity of the master station is valid, if so, allowing the master station to carry out safe operation on the slave station, or else, prohibiting the master station from carrying out safe operation on the slave station. The method of the invention can greatly enhance the safety and lower the system maintenance cost.

Description

technical field [0001] The invention relates to a power device, especially a power management system. Background technique [0002] In the communication of the existing power management system, the industry standard such as DL / T645 is usually adopted. This standard specifies the communication protocol between master and slave devices. Among them, at the application layer, passwords are used for relatively important operations involving slave devices, such as: for writing data, clearing the maximum demand, clearing the meter, and clearing events, the master station sends The request frame carries a password; and for password management, that is, to change the password, it is stipulated that the request frame of the master station carries the old password and the new password, and the normal response frame of the slave station should report the new password. [0003] In the existing communication mode, in the centralized meter reading system composed of electric meters (equi...

AI Technical Summary

Problems solved by technology

Since the password value is relatively stable, the device encoding address used in the communication process is also relatively stable. Therefore, there is no effective change mechanism for data transmission, and the password is easy to be stolen.

[0004] Moreover, this communication method also limits the application programming of the meter's software, requiring manual operation of the meter's programming with a physical switch, which greatly increases the maintenance cost of the system

[0005] It can be seen that the existing communication method, whether it is the data transmission of the electric meter to the concentrator, or the data transmission from the concentrator to the management center computer of the power company, the whole process is a fixed clear code transmission, the data security is extremely low, and the system maintenance cost is very low. high

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