论文标题
通过不平衡的电源分配系统中的两次尺度控制，降低保护电压（CVR）
Conservation Voltage Reduction (CVR) via Two-Timescale Control in Unbalanced Power Distribution Systems
论文作者
论文摘要
电压控制设备用于电源分配系统中，以通过更接近可接受的电压限制来减少功耗；该技术称为降低电压（CVR）。系统的传统设备（具有二进制控制）和新设备（例如具有连续控制的智能逆变器）的不同操作模式以及可变的光伏（PV）生成导致电压波动导致电压波动，这使得实现CVR目标的具有挑战性。本文对馈线的电压控制设备进行了两次尺度的控制，以实现CVR，其中包括（1）在较慢的时间尺度上运行的集中式控制器，以协调整个馈线的电压控制设备以及（2）在更快的时间尺度上运行的本地控制器，以减轻由于PV变异性而缓解电压波动。集中式控制器使用三相最佳功率流模型来获得旧式设备和智能逆变器的决策变量。本地控制器操作智能逆变器，以最大程度地减少电压波动，并通过调整反应性功率支持来使节点电压恢复其参考值。使用IEEE-123总线（中型）和R3-12.47-2（大尺寸）馈线对所提出的方法进行验证。证明所提出的方法可以有效地实现不平衡分配系统的CVR目标。
Voltage control devices are employed in power distribution systems to reduce the power consumption by operating the system closer to the lower acceptable voltage limits; this technique is called conservation voltage reduction (CVR). The different modes of operation for system's legacy devices (with binary control) and new devices (e.g. smart inverters with continuous control) coupled with variable photovoltaic (PV) generation results in voltage fluctuations which makes it challenging to achieve CVR objective. This paper presents a two-timescale control of feeder's voltage control devices to achieve CVR that includes (1) a centralized controller operating in a slower time-scale to coordinate voltage control devices across the feeder and (2) local controllers operating in a faster timescale to mitigate voltage fluctuations due to PV variability. The centralized controller utilizes a three-phase optimal power flow model to obtain the decision variables for both legacy devices and smart inverters. The local controllers operate smart inverters to minimize voltage fluctuations and restore nodal voltages to their reference values by adjusting the reactive power support. The proposed approach is validated using the IEEE-123 bus (medium-size) and R3-12.47-2 (large-size) feeders. It is demonstrated that the proposed approach is effective in achieving the CVR objective for unbalanced distribution systems.
