Abstract：In order to ensure the security of embedded-based distributed photovoltaic system data，a lightweight encryption algorithm was proposed on the basis of 128-bit advanced encryption standard（AES）for the problem of limited embedded computing resources. Firstly，the AES round function was optimized to reduce the number of rounds containing column mixing；secondly，the lightweight AES was designed through two steps：lightweight optimization of column mixing and key expansion；finally，the AES experimental simulation platform was set up to experiment and analyze the lightweight AES，and to validate the efficiency and security of the improved encryption algorithm. The experiments show that the lightweight AES，compared with the AES encryption algorithm，can improve the encryption and decryption speed by 19.50% while ensuring the security of information transmission.

    Key words：advanced encryption standard（AES）encryption algorithm；lightweight；distributed photovoltaic；

embedded-based