可重构配电网的辅助前馈电压控制
Supplementary Feedforward Voltage Control in a Reconfigurable Distribution Network
摘要：
网络重构（NR）由于其能够将传统配电网（DN）转换为自愈电网而受到广泛关注。本文提出了一种新的策略，实时电压调节（VR）在可重构DN，从而实现最佳的前馈控制的同步和逆变器为基础的分布式发电机（DG）与馈线开关（SW）的操作协调。这使得能够抢先补偿由NR辅助负载恢复引起的DN电压的即将到来的偏差。一个强大的优化问题，制定使用NR的动态分析模型，设计前馈电压控制器（FVC），最小化电压偏差相对于H ∞范数。DG参数和负荷需求的估计误差反映在最佳FVC的设计，通过多面体不确定性建模，进一步提高了鲁棒性的建议VR策略。小信号分析和案例研究进行，证明了最佳的鲁棒FVC在提高实时VR时，NR被激活的负荷恢复的有效性。所提出的FVC的性能也验证了各种操作条件下的可重构DN，其特征主要是SW操作，网络参数错误，和通信时间延迟。
英文摘要：
Network reconfiguration (NR) has attracted much attention due to its ability to convert conventional distribution networks (DNs) into self-healing grids. This paper proposes a new strategy for real-time voltage regulation (VR) in a reconfigurable DN, whereby optimal feedforward control of synchronous and inverter-based distributed generators (DGs) is achieved in coordination with the operation of feeder line switches (SWs). This enables preemptive compensation of upcoming deviations in DN voltages caused by NR-aided load restoration. A robust optimization problem is formulated using a dynamic analytical model of NR to design the feedforward voltage controllers (FVCs) that minimize voltage deviations with respect to the H infinity norm. Errors in the estimates of DG parameters and load demands are reflected in the design of optimal FVCs through polytopic uncertainty modeling, further improving the robustness of the proposed VR strategy. Small-signal analysis and case studies are conducted, demonstrating the effectiveness of the optimal robust FVCs in improving real-time VR when NR is activated for load restoration. The performances of the proposed FVCs are also verified under various operating conditions of a reconfigurable DN, characterized principally by SW operations, network parameter errors, and communication time delays.
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