一种适用于配电网的新分布式潮流控制器拓扑

A Novel Topology of Distributed Power Flow Controller for Distribution Network

常规分布式潮流控制器(DPFC)需通过3次谐波电流以实现串联侧与系统的有功功率交换,串联侧所在支路首末端分别需△/YN、YN/△联结型变压器,因此在配电网中的安装地点受到一定限制。为此该文提出一种适用于配电网的新DPFC(NDPFC)拓扑;分析NDPFC工作原理,应用配电网典型系统验证其潮流调节范围与调控特性;此外,研究NDPFC串并联侧电磁暂态数学模型,为提高鲁棒性与控制精度,提出一种采用三环控制的串联侧Ⅰ、Ⅱ控制策略;最后,在不同配电网场景下,通过仿真验证了NDPFC可实现配电网综合潮流调控、补偿三相不平衡、促进新能源消纳,有效地提高了配电网电能质量。

In order to realize the transmission of the active power flow between the series side and the system,the conventional distributed power flow controller needs to interchange the power through the third harmonic current.Since the special△/YN and YN/△transformers are required at both ends of the branch where the series side is located,the installation location of the distributed power flow controller in the distribution network is limited.Thus,a novel distributed power flow controller(NDPFC)for distribution network is proposed in this paper.The operation principle of the NDPFC is analyzed,and its power flow regulation range and regulation characteristics are verified by the typical distribution network system.In addition,the mathematical model of electromagnetic transient in series side of novel topology is studied,and a control strategy for series sideⅠand series sideⅡbased on the three-loop control is proposed to improve the robustness and control accuracy.Finally,simulations in different distribution network scenarios verify that the NDPFC can realize the power flow regulation for the distribution network,compensate for three-phase imbalance,promote renewable energy consumption,and improve the power quality.