Robust Look-ahead Dispatch of Electricity-heat Integrated Energy System Considering the Flexibility Recovery Period of Heating Networks

The dynamic characteristics of heating network enables it to provide significant regulating capacity for electrical power system, promoting the renewable energy integration. However, how to fully utilize and quantify the flexibility of heating network while maintaining the balance between the heat supply and consumption in a long term, as well as reduce the impact of flexibility tapping on the operating of heating networks, is an urgent problem to be solved currently. A robust look-ahead dispatch method for electricity-heat integrated energy system that takes into account the flexibility recovery period of heating network is proposed. Firstly, a flexibility recovery strategy for heating networks is designed, and thereby, a flexible regulating capacity quantification model for heating networks is proposed, which compromises the flexibility supply period and flexibility recovery period. Secondly, based on the indicator of wind power accommodation risk, robust look-ahead dispatch model of electricity-heat integrated system is proposed by compromising the operational risks and costs. Then the solution approach that takes into account both calculation accuracy and efficiency is developed based on piecewise linear approximation, Big-M method. Finally, through the small-scale test system, the effectiveness of the proposed method is verified. Case studies indicate that the proposed method can be adopted to improve the wind power admissible region by 10.72% and reduce the total cost by 0.87% compared to traditional coordinated dispatch strategy for electricity-heat system, effectively improving the system safety and economy. Meanwhile, the solving method of the proposed model has been confirmed to have good computing efficiency based on a large-scale testing system. © 2023 Science Press. All rights reserved.