论文标题
对动态电压支撑的逆变器的无模型最佳控制
Model-Free Optimal Control of Inverter for Dynamic Voltage Support
论文作者
论文摘要
基于逆变器的资源（IBR）必须在电压下降过程中提供动态电压支撑（DVS），以增强低压乘坐能力。在本文中，我们开发了一种无模型控制方法，以实现最佳DVS（ODV），而无需依赖网格参数的知识。深入研究ODV问题的最佳轨迹，发现当前约束和IBR的最大活动功率约束是绑定的，或者其中一个约束是绑定的。这激发了我们通过扰动和observe（P＆O）基于功率因子角度或反应性电流是操纵（扰动）变量的闭环（P＆O）最佳寻求（OS）。如果步骤序列减少且不可舒服，则该系统可以渐近地渐近地收敛至最佳。提出的无模型最佳控制最终在单阶段光伏（PV）系统中实现
Inverter-based resources (IBRs) are required to provide dynamic voltage support (DVS) during voltage dips to enhance the low-voltage ride-through capability. In this paper, we develop a model-free control method to achieve the optimal DVS (ODVS) without relying on the knowledge of grid parameters. Delving into the optimum trajectory of the ODVS problem, it is found that either the current constraint and the maximum active power constraint of IBRs are binding or one of the constraints is binding. This inspires us to search for the optimum in a closed-loop way by a perturb-and-observe (P&O)-based optimum seeking (OS) controller with either the power factor angle or the reactive current being the manipulated (perturbed) variable. The system is guaranteed to converge asymptotically to the optimum provided the stepsize sequence is diminishing and non-summable. The proposed model-free optimal control is finally implemented within a single-stage photovoltaic (PV) system, where dynamic simulations demonstrate the optimal and fast DVS performance
