Method for measuring and calculating photovoltaic maximum access capacity of power distribution network based on power flow model without precise modeling

Abstract

The invention discloses a power distribution network photovoltaic maximum access capacity calculation method based on an accurate modeling-free power flow model. Comprising the following steps: firstly, fitting a mapping relation between node injection power and node voltage of a power distribution network by using an expressway neural network, and constructing a power flow model without precise modeling; the model can effectively cope with the problem that accurate mathematical modeling cannot be carried out due to incomplete installation of power distribution network measurement equipment and difficulty in accurate acquisition of network frame parameters. And based on the power flow model without accurate modeling, establishing a power distribution network photovoltaic access capacity measurement and calculation model by taking the maximum photovoltaic access capacity as a target and considering the safe operation constraint of the system. And finally, solving the photovoltaic access capacity calculation model by adopting a multi-population genetic algorithm to obtain the maximum photovoltaic access capacity of the power distribution network. According to the method, the problem that the power flow constraint is difficult to establish due to the lack of a grid structure and line parameters of the power distribution network is fully considered, and the traditional power flow constraint is replaced by a power flow model without precise modeling; and meanwhile, the used expressway neural network has good voltage fitting precision and convergence speed, so that the maximum photovoltaic access capacity of the power distribution network can be quickly and accurately solved.

Description

technical field [0001] The invention relates to the technical field of energy data processing, in particular to a method for measuring and calculating the maximum photovoltaic access capacity of a distribution network based on an inaccurate modeling power flow model. Background technique [0002] As the situation of conventional energy supply becomes increasingly severe, photovoltaic power generation has the characteristics of flexibility and environmental protection, and has become an alternative energy source that is widely concerned. Due to the randomness and intermittent nature of photovoltaic output, the large-scale access of photovoltaics will adversely affect the operation safety of the distribution network. Therefore, it is of great significance to reasonably evaluate the photovoltaic capacity of the distribution network. In practical engineering applications, the PV access capacity of the distribution network is planned according to the maximum access capacity. Eve...

AI Technical Summary

Problems solved by technology

With the expansion of the distribution network scale and complex structure, it is difficult to obtain the complete structure and operating parameters of the distribution network with a voltage level of 10kV and below, and it is impossible to carry out accurate modeling and calculation of power flow in the conventional sense. Difficulty in access capacity calculation

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