A Grouping Equivalent Modeling Method for Large-scale Photovoltaic Inverter System

Abstract

The present invention discloses a cluster equivalent modeling method of a large-scale photovoltaic inverter system. The method includes the following steps that: the relative sensitivity of preset control parameters of each photovoltaic inverter is acquired; evaluation standardization is carried out on the preset control parameters of the photovoltaic inverters; the clustering indexes of the photovoltaic inverters are obtained; clustering is carried out on the clustering indexes of the photovoltaic inverters according to a K-means clustering algorithm; and photovoltaic inverters in the same cluster are equivalently replaced through an equivalent photovoltaic inverter according to the result of the clustering, and equivalent modeling is carried out. Since the control parameters of the photovoltaic inverters of the large-scale photovoltaic inverter system are different, the photovoltaic inverters are clustered by using the K-means clustering algorithm, so that the photovoltaic inverters in the same cluster have similar dynamic characteristics; the photovoltaic inverters in the same cluster are equivalently replaced through one equivalent photovoltaic inverter, so that the equivalent modeling can be carried out; and therefore, error in the modeling of the photovoltaic inverters can be decreased, and the scale of the modeling can be also decreased.

Description

technical field [0001] The invention relates to the technical field of photovoltaic power grids, in particular to a grouping equivalent modeling method of a large-scale photovoltaic inverter system. Background technique [0002] With the advancement of science and technology, large-scale grid-connected photovoltaic power plants have developed rapidly in my country. However, because photovoltaic power generation is different from the power generation characteristics of traditional thermal power plants, the safe and stable operation of photovoltaic power plants connected to the grid faces severe challenges. [0003] Photovoltaic power plants have the advantages of being green and environmentally friendly, and it is very necessary to conduct research on the operating characteristics of the grid after large-scale photovoltaic power plants are connected to the grid. For the photovoltaic system, the photovoltaic array is a static component, and the dynamic characteristics of the ...

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Problems solved by technology

Among them, the stand-alone equivalent method is mainly used in the situation that the control parameters of each photovoltaic inverter are not much different, and the dynamic characteristics are basically the same. However, in the actual photovoltaic power station, the dynamic characteristics of each photovoltaic inverter are different. When the photovoltaic inverter When the dynamic characteristics of the transformer are quite different, there will be a large error between the single-machine equivalent method and the actual situation; the multi-machine equivalent method can overcome the lack of accuracy of the single-machine equivalent method to a certain extent, but it lacks scientific and effective methods. The grouping index of , thus affecting its accuracy

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