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arXiv 2005.14087math.OCcs.CE
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凸分段线性费用公式对AC最优潮流的影响

The Impacts of Convex Piecewise Linear Cost Formulations on AC Optimal Power Flow

Carleton Coffrin, Bernard Knueven, Jesse Holzer, Marc Vuffray

摘要:

尽管通过共享应用领域建立了强大的联系,但电力市场优化方面的研究工作(例如,单元委托)和电力网络优化(例如,最佳功率流)在很大程度上保持独立。一个值得注意的例子是发电费用函数的处理,其中非线性网络优化主要使用多项式表示,市场优化采用分段线性编码。这项工作结合了两条研究线的最先进的结果,以了解最好的数学公式的非线性交流最优潮流问题与分段线性发电费用函数。通过对54个实际测试案例中的非凸模型、线性逼近和凸松弛的广泛数值分析,说明了非线性最优化方法对分段线性函数的数学公式非常敏感。结果表明,糟糕的配方选择会使算法性能降低十倍,使运行时间从几秒增加到几分钟。这些结果提供了宝贵的见解,最佳配方的非线性最优潮流问题的分段线性费用函数,一个重要的一步,建立新一代的能源市场,将非线性交流潮流模型。

英文摘要:

Despite strong connections through shared application areas, research efforts on power market optimization (e.g., unit commitment) and power network optimization (e.g., optimal power flow) remain largely independent. A notable illustration of this is the treatment of power generation cost functions, where nonlinear network optimization has largely used polynomial representations and market optimization has adopted piecewise linear encodings. This work combines state-of-the-art results from both lines of research to understand the best mathematical formulations of the nonlinear AC optimal power flow problem with piecewise linear generation cost functions. An extensive numerical analysis of non-convex models, linear approximations, and convex relaxations across fifty-four realistic test cases illustrates that nonlinear optimization methods are surprisingly sensitive to the mathematical formulation of piecewise linear functions. The results indicate that a poor formulation choice can slow down algorithm performance by a factor of ten, increasing the runtime from seconds to minutes. These results provide valuable insights into the best formulations of nonlinear optimal power flow problems with piecewise linear cost functions, a important step towards building a new generation of energy markets that incorporate the nonlinear AC power flow model.

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