As the installed capacity of renewable energy sources is increasing, the role of inverters is becoming more important in the maintenance of power system stability. Therefore, in this study, we propose the use of a wide area control system (WACS) to control the inverters of photovoltaic (PV) systems in a coordinated manner to improve transient stability. In this method, we select PV systems whose reactive power injections are deemed to suppress the acceleration of the critical generator, based on a time‐domain simulation for each possible fault before the fault occurs. When a fault occurs, we trigger the reactive current injections with the selected PV systems that is, the WACS operates as an event‐based emergency control system. Numerical simulation results demonstrate that this method can further improve transient stability compared with an autonomous reactive current support function that is applied to existing PV inverters. The proposed WACS could be a promising approach to address the transient instability phenomena under unscheduled power flow conditions by periodically updating the control table based on real‐time information.

中文翻译：

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通过广域控制系统对光伏发电系统进行无功控制，以提高电力系统的暂态稳定性

随着可再生能源装机容量的增加，逆变器的作用在维护电力系统稳定性方面变得越来越重要。因此，在这项研究中，我们建议使用广域控制系统（WACS）以协调的方式控制光伏（PV）系统的逆变器，以提高暂态稳定性。在这种方法中，我们基于在故障发生之前针对每个可能故障的时域仿真，选择其无功注入被认为可抑制临界发电机加速的光伏系统。当发生故障时，我们将使用选定的光伏系统触发无功电流注入，即WACS作为基于事件的应急控制系统运行。数值模拟结果表明，与应用于现有光伏逆变器的自主无功电流支持功能相比，该方法可以进一步改善瞬态稳定性。通过基于实时信息定期更新控制表，提出的WACS可能是解决计划外潮流条件下瞬态不稳定性现象的一种有前途的方法。