Unit commitment Considering Network Dynamic Characteristics of Electricity-Gas-Heat Integrated Energy System

With the strengthening of electricity-gas-heat connectivity, an essential problem to be addressed is how to efficiently release the flexibility of integrated energy systems (IES) and wind power accommodation capacity. The slow dynamic propagation characteristics of the network, which includes natural gas and heat in energy transmission, provide a certain amount of energy storage capacity to the corresponding network. As a result, this study provides a unit commitment model for a linked system of electricity, gas, and heat that takes into account the dynamic properties of networks. The dynamic natural gas pipeline storage and heat network transmission delay effect are investigated and modeled. In addition, a unit commitment (UC) model is developed, which takes into account multi-energy complementarity as well as network dynamic characteristics. Then, using piecewise linearization, convert it to a mixed linear integer programming problem (MILP). The proposed strategy can lower the frequency of UC, according to case studies. Meanwhile, the slower emission of gas and heat improves operation flexibility.