Unit Commitment With Gas Network Awareness
Unit Commitment With Gas Network Awareness
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DOI：
10.1109/tpwrs.2019.2942298
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发表时间：
2019-02
影响因子：
6.6
通讯作者：
Geunyeong Byeon;P. Van Hentenryck
中科院分区：
文献类型：
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作者：
Geunyeong Byeon;P. Van Hentenryck
最近发电燃料组合的变化，特别是燃气发电厂（GFPP）的增加，已经在电力和天然气传输系统之间产生了显著的相互依赖性。然而，尽管它们的物理和经济耦合，这些网络仍然独立运行，具有异步市场机制。这种运行模式可能会在拥挤的环境中导致重大的经济和可靠性风险，正如2014年美国东北部经历的极地涡旋事件所揭示的那样。为了降低这些风险，同时保持当前的市场结构，本文探讨了将天然气网络意识引入标准单位承诺模型的想法。在假设电力系统运营商对天然气需求预测和天然气网络有一定（或完全）了解的情况下，本文提出了一个三层数学方案，其中天然气分区价格由天然气通量守恒约束的对偶解给出，承诺决策受投标有效性约束，以确保承诺的gfpp的经济可行性。这个三层规划可以重新表述为一个单级混合整数二阶锥规划，然后可以使用专用的Benders分解来求解。该方法在美国东北部的一个案例研究中得到了验证，该案例可以重现2014年初冬经历的天然气和电力价格飙升。案例研究的结果表明，单位承诺中的天然气意识有助于避免电价峰值，同时保持天然气价格在合理水平。
Recent changes in the fuel mix for electricity generation and, in particular, the increase in Gas-Fueled Power Plants (GFPP), have created significant interdependencies between the electrical power and natural gas transmission systems. However, despite their physical and economic couplings, these networks are still operated independently, with asynchronous market mechanisms. This mode of operation may lead to significant economic and reliability risks in congested environments as revealed by the 2014 polar vortex event experienced by the northeastern United States. To mitigate these risks, while preserving the current structure of the markets, this paper explores the idea of introducing gas network awareness into the standard unit commitment model. Under the assumption that the power system operator has some (or full) knowledge of gas demand forecast and the gas network, the paper proposes a tri-level mathematical program where natural gas zonal prices are given by the dual solutions of natural-gas flux conservation constraints and commitment decisions are subject to bid-validity constraints that ensure the economic viability of the committed GFPPs. This tri-level program can be reformulated as a single-level Mixed-Integer Second-Order Cone program which can then be solved using a dedicated Benders decomposition. The approach is validated on a case study for the Northeastern United States [1] that can reproduce the gas and electricity price spikes experienced during the early winter of 2014. The results on the case study demonstrate that gas awareness in unit commitment is instrumental in avoiding the peaks in electricity prices while keeping the gas prices to reasonable levels.