计及灵活配电单元的交直流混合配电系统潮流计算方法

Calculation Method of Power Flow in AC&DC Hybrid Distribution System with Flexible Power Distribution Equipment

提出了基于灵活配电单元,分布式电源和混合负荷即插即用的交直流混合配电系统潮流模型,并采用前推回代法进行交替迭代求解。通过建立针对各种控制策略并考虑损耗下的灵活配电单元的等效模型,得出灵活配电单元的潮流方程,同时根据分布式电源及混合负荷的工作特性分别建立对应的潮流模型,并进行节点等效,进一步根据系统结构划分分别建立了交流、直流网络的潮流方程。最后通过算例对所提出的潮流模型和算法进行验证,仿真结果表明,所提交直流混合配电系统潮流模型具有较高的准确性,且潮流算法针对交直流配电、多向潮流主动流动等问题具有一定的可靠性及灵活性。

This paper proposes the power flow model of AC DC hybrid power distribution system,in which distributed generators and mixed loads plug and play and flexible power distribution units are the core. Forw ard-backw ard sweep method is used for alternate iterative solution. The power flow equations of flexible power distribution units are obtained by establishing equivalent model of the flexible power distribution units considering advanced control strategies and the loss.Meanw hile,according to the operation characteristics of distributed generators and mixed loads,corresponding power flow models are established respectively,whose node equivalent is carried out. And then,the power flow equations of AC and DC netw orks are established according to the system structure. Finally,the proposed power flow model and algorithm are validated by examples. Simulation results show that the proposed power flow model of ACDC hybrid power distribution system has high accuracy,and the power flow algorithm has a certain degree of reliability and flexibility for AC DC hybrid power distribution,active power flow of multi-directional power flow and other issues.