Abstract
There are dozens or hundreds of grid-connected inverters for large-scale photovoltaic power plants. In order to facilitate the study of the impact that large-scale photovoltaic power plants have on the power system while avoiding the need to establish a detailed model for each inverter, it is necessary to establish the equivalent model of large-scale photovoltaic power plants. Power generation units of the same type are combined by K-means clustering algorithm to reduce the simulation scale in number. According to the actual data of Shenmu large-scale grid-connected photovoltaic power station, employing RT-LAB software is used to conduct simulation verification and error analysis. The simulation results verify the proposed clustering equivalent modeling method is effective and can accurately track photovoltaic power station's dynamic characteristics.
Highlights
In recent years, due to fossil energy depletion and environmental degradation, demand for renewable energy continues to increase
In [4], an equivalent model of a large synchronous photovoltaic power plant is obtained by controlling the equivalent photovoltaic power generation unit using a synchronous power controller, but it is aimed at a photovoltaic power plant with virtual synchronization characteristics and is not suitable for ordinary photovoltaic power plants
This paper studies the clustering equivalent modeling of photovoltaic power plant dealing with problems of large scale and long simulation time in the modeling of large-scale photovoltaic power plants
Summary
Due to fossil energy depletion and environmental degradation, demand for renewable energy continues to increase. In [7], a large-scale clustering modeling method for large-scale photovoltaic power plants is proposed by using the characteristic distance index of the inverter control parameters and using the K-means clustering algorithm. It only calculates the equivalent parameters of the inverter and does not consider parameters such as the impedance of the transformer and line. Taking the inverter as the key point, considering the output characteristics of the PV array, the control system, the transformer and the transmission line, the whole clustering equivalent model of the PV power plant is established, and the calculation of the equivalent parameters and the deviation calculation are studied. RT-LAB software was used to simulate the actual data of a grid-connected photovoltaic power plant in Shenmu, Shanxi province to verify the adaptability of the proposed method
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