arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2007.06074math.OC
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AC最优潮流的学习增强拟牛顿法

A Learning-boosted Quasi-Newton Method for AC Optimal Power Flow

Kyri Baker

摘要:

电网运营商通常全天解决大规模非凸最优潮流(OPF)问题,以确定发电机的最优设定点,同时遵守物理约束。尽管是许多OPF求解器的核心,但Newton-Raphson可能很慢并且数值不稳定。为了减少与计算完整雅可比矩阵及其逆矩阵相关联的计算负担,许多拟牛顿法试图通过利用近似雅可比矩阵来找到最优性条件的解。本文提出了一种基于机器学习的拟牛顿法,该方法无需计算雅可比矩阵或近似雅可比矩阵,即可对候选最优解进行迭代更新。所提出的基于学习的算法利用具有反馈的深度神经网络。通过选择适当的权值和激活函数,模型成为一个压缩映射,可以保证收敛性。对多达1,354个节点的网络的计算结果表明,所提出的方法能够非常快地找到AC最优潮流的近似解。

英文摘要:

Power grid operators typically solve large-scale, nonconvex optimal power flow (OPF) problems throughout the day to determine optimal setpoints for generators while adhering to physical constraints. Despite being at the heart of many OPF solvers, Newton-Raphson can be slow and numerically unstable. To reduce the computational burden associated with calculating the full Jacobian and its inverse, many Quasi-Newton methods attempt to find a solution to the optimality conditions by leveraging an approximate Jacobian matrix. In this paper, a Quasi-Newton method based on machine learning is presented which performs iterative updates for candidate optimal solutions without having to calculate a Jacobian or approximate Jacobian matrix. The proposed learning-based algorithm utilizes a deep neural network with feedback. With proper choice of weights and activation functions, the model becomes a contraction mapping and convergence can be guaranteed. Results shown for networks up to 1,354 buses indicate the proposed method is capable of finding approximate solutions to AC OPF very quickly.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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