Online clustering equivalent modeling method of photovoltaic power plant

Abstract

The invention discloses an online clustering equivalent modeling method of photovoltaic power plant. The method comprises the following steps: building photovoltaic power generation unit models with active and reactive power control links and low voltage crossing control links, and then building a photovoltaic power plant model with multiple photovoltaic units; according to the various types of photovoltaic power generation unit models of the photovoltaic power plant model, inferring and calculating the unit impulse curves corresponding to the model; using the distances among the unit impulse responding curves as clustering indexes; and utilizing the K-means algorithm to conduct online clustering to the photovoltaic power plant model so as to obtain the clustering result of the active and reactive power control links of an inverter; according to the actual output of each photovoltaic unit in the photovoltaic power plant model, calculating the equivalent parameters of each equalizer; and establishing an online clustering equivalent model of a photovoltaic power plant. In the invention, the clustering result bears no relationship with the output of the photovoltaic units and is solely determined by the control parameters of the inverter. Therefore, it is not necessary to establish a parameter sensitivity database offline, which greatly reduces the computational complexity.

Description

technical field [0001] The invention relates to the field of grid analysis and calculation, in particular to an online grouping equivalent modeling method of a photovoltaic power station. Background technique [0002] Large-scale centralized photovoltaic power stations have developed rapidly in recent years. The global cumulative photovoltaic installed capacity reached 67GW in 2011, and reached 200GW in 2015. The connection of large-scale and large-capacity photovoltaic power plants to the grid has a great impact on the safe and stable operation of the power grid. Establishing an accurate dynamic equivalent model of large-scale photovoltaic power plants has become the basis for quantitatively evaluating the impact of large-scale photovoltaic power plants on the power grid. However, Large-scale photovoltaic power plants have a large number of photovoltaic power generation units, usually dozens to hundreds of photovoltaic units, which are generally selected from products from ...

AI Technical Summary

Problems solved by technology

[0003] For the overall modeling of photovoltaic power plants at this stage, related technologies have proposed an online grouping modeling method with characteristic distance as the grouping index, but it does not consider the model changes caused by the photovoltaic power station providing certain reactive power support during low-voltage ride-through. Can not reflect the characteristics of large-scale photovoltaic power plants in actual operation

[0

Images