Abstract
Aiming at the problem of insufficient flexibility of the power system caused by large-scale wind power grid integration, a flexible economic dispatch model of the electricity-gas integrated system that considers power-to-gas and demand responses is proposed. First, it elaborates on the scheduling flexibility and demand response model. Secondly, the power system and the natural gas system are regarded as different stakeholders; with the goal of minimizing their respective operating costs, a two-tier distributed coordination optimization model of electricity and gas system is established. In order to achieve the coordination and optimization of the upper and lower systems, slack variables are introduced to describe the infeasible part of the power system scheduling results in the natural gas system and are used for interactive iterative solution of the model. The numerical results of the revised IEEE 30-node power system and 10-node natural gas system illustrate the effectiveness and necessity of the proposed model, as well as the superiority of comprehensively considering power-to-gas and demand response in improving the flexibility and economy of the power system.
Highlights
With the increasingly prominent energy and environmental problems, renewable energy power generation has attracted wide attention from all over the world [1]
The uncertainty and volatility of wind power challenge the flexibility of power systems, resulting in a large amount of wind power curtailment [2]
It is urgent to improve the power system flexibility to benefit the accommodation of wind power while ensuring the secure operation of power systems
Summary
With the increasingly prominent energy and environmental problems, renewable energy power generation has attracted wide attention from all over the world [1]. The uncertainty and volatility of wind power challenge the flexibility of power systems, resulting in a large amount of wind power curtailment [2]. In 2017, the total wind power curtailment rate was over 20% in the north of China [3]. It is urgent to improve the power system flexibility to benefit the accommodation of wind power while ensuring the secure operation of power systems. Many measures can be taken to improve the flexibility of power systems with high penetration of wind power. Power-to-gas (P2G) facility is an effective way that has recently been widely studied to provide the flexibility of power systems with large-scale wind power in China [6]. Since the large-capacity power storages still face challenges, excessive wind power has to be curtailed. Afterwards, methane can be stored via the natural gas systems or storage devices [7]
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