Abstract: In order to improve computational efficiency and power flow accuracy, an AC-corrected model and method for intra-day generation scheduling is proposed. The intra-day generation scheduling optimization model based on DC flow is established first, then the optimization generation plan is created with consideration of network security constraints under normal and N-1 contingency scenarios. An AC-corrected model is built with objective of minimizing overall generation power output adjustment based on obtained generation active power schedule and reactive load forecast or historical distribution. This model corrects generation power outputs and therefore improves accuracy of network power flow to meet real-time operation requirements. The case study of a real power system show that proposed model and method can effectively improve computational efficiency and power flow accuracy as expected.

Key words: generation scheduling, economic dispatch, intra-day rolling, AC power flow, network security, security correction, non-linear programming, parallel computation