论文标题
基于虚拟振荡器的网格形成控制器的动态电压刚度控制技术
Dynamic Voltage Stiffness Control Technique for a Virtual Oscillator based Grid-forming Controller
论文作者
论文摘要
虚拟振荡器控制是用于网格形成逆变器的最新控制技术。基于虚拟振荡器的控制器（VOC）提供了常规下垂控制器的所有稳态下垂功能，此外，还提供了与连接的电网络的时域同步。但是，现有文献并未考虑对VOC电压刚度的动态控制方面。电压刚度是格式形成逆变器的重要参数。如果电压刚度太高，则逆变器会拾取PCC的所有反应性需求。相反，如果刚度太低，则逆变器根本不参与电压调节。限制较高电压下垂的反应功率输出，尤其是在连接到弱网格时，对于VOC来说是具有挑战性的。进入当前控制模式是现有的解决方案，但它严重影响了PCC和PCC电压之间的有效同步。结果，网格形成的操作模式效率低下。本文介绍了基于虚拟的阻抗（VIM）的动态电压刚度控制技术。提出了建议的电压刚度控制器的系统设计程序。此外，提出了一种严格的稳定性分析方法。
Virtual oscillator control is the latest control technique for grid-forming inverters. Virtual Oscillator based Controllers (VOCs) provide all the steady-state droop functionalities of conventional droop controllers and, in addition, the time-domain synchronization with a connected electrical network. However, existing literature does not consider the aspect of dynamic control over the voltage stiffness of a VOC. Voltage stiffness is a vital parameter for a grid-forming inverter. If the voltage stiffness is too high, the inverter picks up all the reactive power demand of the PCC. In contrast, if the stiffness is too low, the inverter does not participate in voltage regulation at all. Limiting the reactive power output during a higher voltage sag, especially when connected to a weak grid, is challenging for a VOC. Entering into the current control mode is the existing solution, but it severely affects the effective synchronization between the VOC and the voltages of the PCC. As a result, the grid-forming mode of operation becomes inefficient. This article has introduced a Virtual Impedance (VIm) based dynamic voltage stiffness control technique for VOCs. The systematic design procedure for the proposed voltage stiffness controller is presented. In addition, a rigorous approach for stability analysis is presented.
