考虑分布式电源详细模型的配电网多相状态估计

摘要

在传统配电网状态估计中，主要考虑拓扑约束和线性阻抗元件约束。在大量分布式电源接入配电网后，关于负序和零序的控制也相应增加。对于三相不平衡的状态估计，除了线性阻抗元件约束外，还要考虑分布式电源对不平衡分量即负序和零序的约束方程。因此，首先建立了常见的分布式电源在状态估计中的模型，然后提出了基于改进节点法的配电网多相状态估计方法，最后通过算例分析考虑与不考虑分布式电源的模型对状态估计结果的影响。%Traditional distribution state estimation only contains topological constraints and linear impedance branch constraints. With distributed generators (DGs) penetrating into distribution network, lots of negative and zero sequence control equations exist. For unbalance state estimation, there are zero and negative sequence constraints except linear branch constraints. The three-phase distributed generators’ models in state estimation are firstly proposed. And then a state estimation method based on modified nodal analysis is proposed and numerical tests’ results show the difference between considering and not considering distributed generators’ models.