Decentralized Economic Dispatch of Integrated Electricity-gas Energy System Considering P2G and Line Pack

Abstract

The reality of long-term independent planning and operation of power system and gas system poses challenges to centralized economic dispatch. To preserve the privacy of different energy systems and give full play to the role of the interconnected system in wind absorption, a decentralized economic dispatch strategy of integrated electricity-gas energy system (IEGES) considering power to gas $(\mathrm{P}2\mathrm{G})$ and line pack is proposed. Firstly, P2G is applied to realize the conversion of wind power to gas, and the operating cost of P2G is considered to avoid over-conversion of power from other sources. After that, the regulation mechanism of line pack is analyzed, so that it can cooperate with P2G to store wind power without additional cost. Then, the decentralized solution framework of IEGES is constructed based on the alternating direction method of multipliers (ADMM), and the day-ahead economic dispatch model of IEGES is established considering various operating costs and safety constraints. Moreover, the nonlinear model is processed by a linear AC power flow algorithm and an incremental linearization method to reduce the difficulty of solution. Finally, the effectiveness and economy of the proposed strategy are verified by simulation analysis.