A Transient Stability Risk Assessment Method Considering the Uncertainty of New Energy Units

Abstract

The invention discloses a transient stability risk assessment method considering the uncertainty of new energy units, which generates an expected fault based on the current operating state of the power grid and performs transient stability assessment, and identifies the key transmission section of transient stability corresponding to the fault; by short-term The output interval probability of each new energy power plant is obtained from the prediction results of wind force and light intensity, and the power interval and probability of key transmission sections are obtained by probabilistic power flow calculation; the output of new energy units is increased and the severity of faults is evaluated, and the operation risk of the section power interval is accumulated as Risk indicator for failure. If the risk index of failure is greater than the threshold value, measures to reduce the output of conventional units should be given priority under the premise of ensuring the output of new energy power plants. If the requirements cannot be met, the risk index is guaranteed to be less than the threshold value by limiting the output of new energy power plants. The method of the invention can comprehensively reflect the operating conditions of the system, discover potential risks and weak points in the system, and exert the operating potential of the power grid.

Description

technical field [0001] The invention relates to a transient stability risk assessment method considering the uncertainty of new energy units, and belongs to the technical field of electric power system automation. Background technique [0002] The vigorous development of new clean energy such as wind power and photovoltaics can reduce greenhouse gas emissions and save fossil energy consumption. However, due to the uncertainty and intermittency of new energy output, its large-scale grid connection has brought huge challenges to the safe operation of the power grid. challenge. The risk assessment method considering the uncertainty of new energy output can fully reflect the operating conditions of the system, and discover potential risks and vulnerabilities in the system, and further develop the operating potential of the power grid through prevention and pre-control. [0003] At present, the short-term new energy power prediction method considering the timing characteristics ...

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Problems solved by technology

However, the above method can only evaluate the static safety risk of the system. For the risk assessment of transient stability, it is necessary to determine the operation mode data and perform time-domain simulation. For example, the number of wind farms in the system is M, and the estimated If the number of output intervals is K, then the number of uncertain scenes is K M , even if only one point is selected for each uncertainty scenario for transient stability analysis calculation, the calculation amount cannot meet the requirements of online risk assessment

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