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Centralized Synchronous Controller Based on Load Angle Regulation for Photovoltaic Power Plants

机译:基于光伏发电厂负荷角度调节的集中式同步控制器

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摘要

The integration of renewable energies based on photovoltaic power plants (PVPPs) is increasing exponentially fast. In consequence, stability problems associated with the lack of inertia are becoming a serious concern. Transmission and distribution system operators are demanding more requirements in PV plants to provide grid functionalities in terms of frequency and voltage support. Therefore, power converters based on virtual synchronous controllers have been proposed to emulate the dynamic behavior of synchronous generators. Control strategies such as the synchronous power controller have been proposed for PV applications to fulfill this requirement. However, most of these control strategies are integrated locally as an add-on firmware embedded in each converter, providing the demanded support in their connection point. For PVPPs, the inherent synchronous characteristic is expected at the connection point with the electrical grid, which is not always the connection point of each power converter; thus, unexpected power support levels can be obtained. The aggregation of several power converters operating in a coordinated synchronous action would solve this issue, due to the fact that they can provide voltage and frequency support in a specific point. In this article, a centralized control strategy based on a synchronous central architecture is proposed. The control strategy emulates an aggregated synchronous control to regulate a PVPP as a coordinated system. The simulation and experimental results validate the effectiveness of the control proposed.
机译:基于光伏发电厂(PVPPS)的可再生能量的整合速度迅速增加。因此,与缺乏惯性相关的稳定性问题正在成为一个严重的问题。传输和分配系统运营商要求在PV工厂要求更多要求在频率和电压支撑方面提供网格函数。因此,已经提出了基于虚拟同步控制器的功率转换器来模拟同步发电机的动态行为。已经提出了控制策略,例如同步电力控制器的PV应用以满足此要求。但是,大多数这些控制策略在本地集成为嵌入在每个转换器中的附加固件,在其连接点提供所需的支持。对于PVPPS,预期在具有电网的连接点处的固有同步特性,这并不总是每个功率转换器的连接点;因此,可以获得意外的功率支持水平。在协调同步动作中运行的几个功率转换器的聚合将解决此问题,因为它们可以在特定点中提供电压和频率支持。在本文中,提出了基于同步中央架构的集中控制策略。控制策略模拟了聚合的同步控制,以调节PVPP作为协调系统。模拟和实验结果验证了对控制的有效性。

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