Abstract: Both unit maintenance scheduling and security-constrained unit commitment are important parts of power operation structure optimization.With the penetration of large-scale wind power and the boost of smart grid scheduling,a new requirement is put forward upon power operation structure optimization.In order to improve the security and reliability of power system operations further,enhance the wind power accommodation capacity and high-precision,intelligent power grid scheduling,a novel mode of power operation structure optimization considering N-1security constraints is proposed.This mode fully taps the optimization space of coordination of unit maintenance scheduling and security-constrained unit commitment in a longer period and larger spatial dimensions,considering N-1security constraints,effectively improving the security and economy of unit maintenance scheduling and security-constrained unit commitment.The benefits from the collaborative optimization of unit maintenance scheduling and security-constrained unit commitment are verified by numerical experiments on an IEEE 30-bus system and a provincial power system.