Solar power generation is exhibiting a distributed development trend, and has changed conventional characteristics of power supply and consumption. The integration of large-scale distributed photovoltaic (PV) generation forms high-penetration PV clusters in distribution networks, which aims to organize and control geographically scattered resources. However, due to the inherent uncertainty, high-penetration PV clusters are suffering from random disturbances and serious voltage risks. Besides, integrating system via power electronic interfaces, PV generation usually tracks system frequency without any backup and regulation capacity, which poses significant challenges to system operation, and requires greater flexibility of voltage control. In fact, by using appropriate methods, PV inverters can autonomously regulate reactive power output in a distributed manner to improve voltage profiles in clusters. In this article, a distributed voltage control method for PV generation clusters is presented to realize decentralized coordination of PV inverters. Based on matrix splitting and approximate Newton method, it can fast respond to reactive power mismatch and realize voltage profiles optimization. Exhibiting a more efficient, reliable and flexible performance than existing decentralized methods in case studies, the proposed method is demonstrated to effectively organize and control PV cluster to provide corresponding reactive power support and exert friendly effect on system operation.

中文翻译：

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基于近似牛顿法的光伏发电集群快速分布式电压控制

太阳能发电呈现出分散的发展趋势，并且改变了电力供应和消耗的常规特性。大规模分布式光伏（PV）发电的集成在配电网络中形成了高渗透性PV集群，旨在组织和控制地理上分散的资源。但是，由于固有的不确定性，高渗透率的光伏集群正遭受随机干扰和严重的电压风险。此外，通过电力电子接口集成系统，光伏发电通常在没有任何备用和调节能力的情况下跟踪系统频率，这给系统运行带来了巨大挑战，并且需要更大的电压控制灵活性。实际上，通过使用适当的方法，光伏逆变器可以以分布式方式自主调节无功功率输出，以改善集群中的电压分布。本文提出了一种分布式光伏发电集群的电压控制方法，以实现光伏逆变器的分散协调。基于矩阵分裂和近似牛顿法，它可以快速响应无功功率失配并实现电压曲线优化。在案例研究中，与现有的分散方法相比，该方法具有更高效，可靠和灵活的性能，证明了该方法可以有效地组织和控制光伏集群，从而提供相应的无功功率支持，并对系统运行产生友好的影响。提出了一种用于光伏发电集群的分布式电压控制方法，以实现光伏逆变器的分散协调。基于矩阵分裂和近似牛顿法，它可以快速响应无功功率失配并实现电压曲线优化。在案例研究中，与现有的分散方法相比，该方法具有更高效，可靠和灵活的性能，证明了该方法可有效地组织和控制光伏集群，从而提供相应的无功功率支持，并对系统运行产生友好的影响。提出了一种用于光伏发电集群的分布式电压控制方法，以实现光伏逆变器的分散协调。基于矩阵分裂和近似牛顿法，它可以快速响应无功功率失配并实现电压曲线优化。在案例研究中，与现有的分散方法相比，该方法具有更高效，可靠和灵活的性能，证明了该方法可以有效地组织和控制光伏集群，从而提供相应的无功功率支持，并对系统运行产生友好的影响。