Method for quickly determining voltage stability of large-scale distributed photovoltaic access power distribution network

Abstract

The invention discloses a method for quickly determining the voltage stability of a large-scale distributed photovoltaic access power distribution network, and the method comprises the steps: expressing the correlation between a voltage change and a node reactive power change through a network power flow equation, and expressing the correlation between a node reactive power adjustment amount and ameasurement point voltage through a piecewise linear function equation; integrating the two equations based on a function transformation rule to describe a relationship between a network state and avoltage measurement result of any node. In order to describe a state equation of network voltage change, the voltage stability problem of the power distribution network is further expressed as a process of describing reactive power output of two adjacent iterations, and the voltage stability problem of the power distribution network is converted into a change process of reactive power of an inverter and is subjected to differential solution; the technical problems that in the prior art, for grid connection of large-scale cluster distributed photovoltaics, all nodes or most nodes in a network are connected to a photovoltaic power supply, the calculated amount and the calculation difficulty of a traditional voltage stability calculation method are sharply increased, and parameter setting lacks flexibility are solved.

Description

technical field [0001] The invention belongs to the technical field of distribution network voltage stability, and in particular relates to a method for quickly determining the voltage stability of a distribution network connected to large-scale distributed photovoltaics. Background technique [0002] At present, fossil energy still occupies a pillar position in the global energy structure, and power generation still mainly relies on fossil fuels such as coal and natural gas. However, the emission of a large amount of carbon dioxide and toxic and harmful gases has led to increasingly prominent environmental problems. The emission of greenhouse gases has led to a rise in global temperature, melting of glaciers at the poles, and frequent occurrence of extreme meteorological problems; toxic and harmful substances after fossil energy combustion enter the air, nitrogen oxides Gases such as pollutants and sulfur dioxide cause ecological problems such as photochemical smog, acid ra...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a method for quickly determining the voltage stability of a large-scale distributed photovoltaic access distribution network to solve the problem that all nodes in the network are Or most of the nodes are connected to the photovoltaic power supply, the calculation amount and calculation difficulty of the traditional voltage stability calculation method will rise sharply, and the parameter setting is also very inflexible and other technical problems

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