论文标题
对具有稀疏中性接地的四线电力网络的阻抗转换的计算分析
Computational Analysis of Impedance Transformations for Four-Wire Power Networks with Sparse Neutral Grounding
论文作者
论文摘要
在低压分销网络中，可以通过基于高级优化的分析（例如网络状态估计和网络受限的分布发动机）来加速新型能源技术的集成。由于相位不平衡和中性电压上升效应，分配网络优化模型的可伸缩性是具有挑战性的，需要使用每巴总线的电压变量的4倍，而不是传输系统中的4倍。本文提出了一种新颖的技术，可以将其限制在因子3上，并专门利用低压网络的常见物理特征，其中中性接地很少，就像在世界许多地方一样。我们通过将许多已发表的测试用例转换为简化形式来验证OPENDSS中提出的方法，并观察到所提出的“相位到中性”转换对于常见的单个单调的低压网络配置非常准确，并为其他配置提供了高质量的近似值。我们最终使用PowerModelSdistribution.jl提供了不平衡的功率流优化问题的数值结果，以说明约1.42倍的计算速度益处。
In low-voltage distribution networks, the integration of novel energy technologies can be accelerated through advanced optimization-based analytics such as network state estimation and network-constrained dispatch engines for distributed energy resources. The scalability of distribution network optimization models is challenging due to phase unbalance and neutral voltage rise effects necessitating the use of 4 times as many voltage variables per bus than in transmission systems. This paper proposes a novel technique to limit this to a factor 3, exploiting common physical features of low-voltage networks specifically, where neutral grounding is sparse, as it is in many parts of the world. We validate the proposed approach in OpenDSS, by translating a number of published test cases to the reduced form, and observe that the proposed "phase-to-neutral" transformation is highly accurate for the common single-grounded low-voltage network configuration, and provides a high-quality approximation for other configurations. We finally provide numerical results for unbalanced power flow optimization problems using PowerModelsDistribution.jl, to illustrate the computational speed benefits of a factor of about 1.42.
