Power distribution network single photovoltaic digestion capability evaluation method in consideration of voltage out-of -limit risk

Abstract

The invention relates to a power distribution network single photovoltaic digestion capability evaluation method in consideration of voltage out-of -limit risk, which comprises the following steps: (1) the parameter information of a target power distribution network is acquired; (2) a N<d>-day historical load data sample of each distribution transformer of the target power distribution network iscollected, and with the distribution transformer as a unit, a load time sequence model based on multi-parameter normal distribution is created; (3) a N

-day historical output data sample of a photovoltaic power station of a target region is collected, and a photovoltaic relative output time sequence model based on multi-parameter beta distribution is established; (4) according to the load time sequence model based on multi-parameter normal distribution and the photovoltaic relative output time sequence model based on multi-parameter beta distribution, a semi-invariant-based probabilistic load flow method is adopted to calculate a voltage out-of -limit risk evaluation index; (5) a voltage out-of -limit risk limit Rvs_limit is set, and a mixed approximation method is adopted to evaluate the photovoltaic digestion capability of the power distribution network. The method takes the time sequence and uncertainty of distributed loads and photovoltaic output into full consideration, and by quantitatively evaluating the voltage out-of -limit risk of the power distribution network, the method provides a reference for the evaluation of the capacity of the photovoltaic-connected power distribution network.

Description

technical field [0001] The present invention relates to a method for evaluating the capacity of a distribution network to accommodate distributed power sources, and more specifically, to a method for evaluating the capacity of a single photovoltaic power distribution network that considers the risk of voltage overrun. Background technique [0002] The access of a large number of distributed photovoltaics makes the original single power supply radiation distribution network into an active distribution network, which changes the power flow and voltage distribution of the distribution network and also increases the risk of voltage over-limit. Due to the uncertainty of photovoltaic output and the timing correlation with loads, it is difficult to accurately measure the degree of influence on the distribution network voltage by the evaluation method based on the determination of power flow, and the degree of influence is mainly related to the location and connection of photovoltaic...

AI Technical Summary

Problems solved by technology

[0002] The access of a large number of distributed photovoltaics makes the original single power supply radiation distribution network into an activ...

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