Power system steady-state power flow risk identification and prevention method, storage medium and equipment

Abstract

The invention discloses a power system steady-state power flow risk identification and prevention method, a storage medium and equipment. The method comprises the steps of carrying out the probabilitymodeling of an output prediction error of a new energy unit based on prediction data and an actual data set of historical wind speed and illumination intensity, and a power characteristic curve of the new energy unit, according to the real-time prediction value of the output of the current new energy unit, obtaining a probability distribution expression of a corresponding prediction error, and performing random power flow calculation by adopting a semi-invariant method to obtain probability distribution of voltage and branch power of each node, and according to a probability distribution setthreshold, judging whether a risk of voltage and power flow boundary crossing exists at the prediction moment, in the case of no risk, carrying out calculation at the next moment, and in the case of arisk, carrying out active and reactive adjustment on the generator set, and carrying out random power flow calculation again until no risk exists. The method can accurately and efficiently identify the area and degree of the steady-state power flow risk of the power system, provide risk prevention measures, and improve the safe and stable operation capability of the power system.

Description

Technical field [0001] The invention belongs to the technical field of power system risk assessment, and specifically relates to a method, storage medium and equipment for the identification and prevention of steady-state power flow risk of a power system considering the access of a high proportion of new energy sources. Background technique [0002] Because wind power and photovoltaic power generation are clean and environmentally friendly, my country's wind power and photovoltaic power generation will usher in a large-scale construction peak. However, the uncertainty of wind power and photovoltaics leads to uncertainties in the power system flow, which in turn causes problems such as voltage fluctuations and cross-border flow of branch circuits, which poses huge challenges to power system dispatchers. [0003] On the afternoon of August 9, 2019, a large-scale blackout occurred in the UK. The sudden drop in the output of the wind turbines in the Horn offshore wind farm was one of ...

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Problems solved by technology

However, the uncertainty of wind power and photovoltaics leads to the uncertainty of the power system power flow, which in turn causes problems such as voltage fluctuations and branch power flow out of bounds, which brings huge challenges to power system dispatchers

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