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arXiv 2006.09084eess.SYcs.SY
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基于改进渐进套期保值的电-气耦合能源系统随机机组组合

Stochastic Unit Commitment in Electricity-Gas Coupled Integrated Energy Systems based on Modified Progressive Hedging

Haizhou Liu, Xinwei Shen, Qinglai Guo, Hongbin Sun, Wenzhi Zhao, Xinyi Zhao

摘要:

燃气机组数量的不断增加,大大增强了电网与燃气网络之间的耦合。传统上,在气体流动方程的非线性和非凸性,再加上可再生能源引起的随机性,导致计算昂贵的模型,在电力-天然气耦合的综合能源系统(IES)的机组组合。为了加速随机日前调度,我们应用并修改了渐进式套期保值(PH),一种启发式方法,可以并行计算,以产生独立的机组组合。通过应用终止和枚举技术,修改后的PH算法节省了大量的计算时间,特别是当单位生产价格是类似的所有发电机,当IES的规模是大的。此外,一个自适应的二阶锥松弛(SOCR)被用来处理非凸气体流动方程。对IEEE 24节点系统/比利时20节点天然气系统和IEEE 118节点系统/比利时20节点天然气系统进行了案例研究。使用PH时的计算效率是商业软件的188倍,甚至优于Benders Decomposition。同时,PH算法和基准之间的差距是小于0.01%的IES系统,这证明了PH产生的解决方案达到了可接受的最优性在这个随机UC问题。

英文摘要:

The increasing number of gas-fired units has significantly intensified the coupling between power and gas networks. Traditionally, the nonlinearity and nonconvexity in gas flow equations, together with renewable-induced stochasticity, result in a computationally expensive model for unit commitment in electricity-gas coupled integrated energy systems (IES). To accelerate stochastic day-ahead scheduling, we applied and modified Progressive Hedging (PH), a heuristic approach that can be computed in parallel to yield scenario-independent unit commitment. By applying a termination and enumeration technique, the modified PH algorithm saves considerable computational time, especially when the unit production prices are similar for all generators, and when the scale of IES is large. Moreover, an adapted second-order cone relaxation (SOCR) is utilized to tackle the nonconvex gas flow equation. Case studies are performed on the IEEE 24-bus system/Belgium 20-node gas system and the IEEE 118-bus system/Belgium 20-node gas system. The computational efficiency when employing PH is 188 times that of commercial software, even outperforming Benders Decomposition. Meanwhile, the gap between the PH algorithm and the benchmark is less than 0.01% in both IES systems, which proves that the solution produced by PH reaches acceptable optimality in this stochastic UC problem.

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