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Frequency Regulation of Grid Connected Solar PV System Using Battery Storage System

机译：使用电池存储系统的并网太阳能光伏系统的频率调节

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摘要

The recent increase in penetration level of renewable energy resources to the grid has presented a number of difficulties to existing power system operation. This is caused by the fluctuation in the power output of these renewable energy resources. Particularly, the common fluctuation of PV power output causes a temporal discrepancy between generation and demand which results in frequency variation. However, several researchers have investigated different methods that can be used to regulate the frequency of the network. Some of such methods are the inclusion of super-capacitors and flywheels. Therefore, it has become imperative to consider the frequency of the grid at high PV penetration level. This paper considers a battery storage system to provide frequency regulation service in a grid connected PV system. Hence, a flowchart is presented on how load imbalance, frequency variance, battery state of charge (SOC), and available power can be used to maintain network nominal frequency. A well-defined algorithm for determining how the flow of active power based on set parameter limits is presented. The system consists of a PV, DC-DC boost converter, battery storage system, and DC-AC bi-directional converter. The PV plant and the battery storage system are connected to the grid through a DC-AC converter in a manner that bi-directional flow of active power is achieved. The overall flowchart with set parameter limits such as the SOC, frequency variance and load changes is presented.
机译：近期可再生能源对电网的渗透水平的增加呈现了现有电力系统操作的许多困难。这是由这些可再生能源的功率输出中的波动引起的。特别地，PV功率输出的共同波动导致产生和需求之间的时间差异，这导致频率变化。然而，若干研究人员已经调查了可用于调节网络频率的不同方法。一些这样的方法是包含超级电容器和飞轮。因此，在高光伏渗透水平下，必须考虑网格的频率。本文考虑了电池存储系统，可在网格连接的PV系统中提供频率调节服务。因此，提出了一种流程图，用于如何负载不平衡，频率方差，电池充电状态（SOC），并且可用功率可用于维持网络标称频率。呈现了一种明确定义的算法，用于确定如何基于集合参数限制的有效功率流的流动。该系统由PV，DC-DC升压转换器，电池存储系统和DC-AC双向转换器组成。 PV工厂和电池存储系统通过DC-AC转换器通过DC-AC转换器连接到电网，以便实现有功功率的双向流动。呈现了具有SEC，频率方差和负载变化的设置参数限制的整体流程图。

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