Static voltage stability assessment method of three-phase unbalanced power distribution network including wind power

Abstract

The invention discloses a static voltage stability assessment method of a three-phase unbalanced power distribution network including wind power. The static voltage stability assessment method of the three-phase unbalanced power distribution network including the wind power comprises the steps of: obtaining parameters of a power distribution network system and wind power parameters accessed to the power distribution network; setting the initial value of the load increase factor LSF of the power distribution network system including the wind power as 1, obtaining a tide of the power distribution network system including the wind power at the presence of the current LSF based on the parameters of the power distribution network system and the wind power parameters , judging whether the tide is converged, if so, obtaining a voltage amplitude value and a phase angle of each node of the power distribution network and a transmission power of the terminal end of each branch, otherwise, indicating that the power distribution network loses the static voltage stability; obtaining the static voltage stability index of each branch based on the tide calculation result of the power distribution network including the wind power; obtaining a static voltage stability index and a stability margin of the whole network based on the static voltage stability index of each branch, assessing the static voltage stability of the power distribution network including the wind power at the presence of the current LSF based on the sizes of the static voltage stability index and the stability margin, and determining the weakest branch and weakest node of the system.

Description

technical field [0001] The invention belongs to the research field of voltage stability of a distribution network containing distributed power sources, and more specifically relates to a static voltage stability evaluation method of a three-phase unbalanced distribution network containing wind power. Background technique [0002] Improving the static voltage stability of distribution network is of great significance to ensure the reliability of power supply and improve the quality of electric energy. In recent years, with the continuous increase of single-phase loads such as electric locomotives, electric arc furnaces, and single-phase rectification equipment in the distribution network, the three-phase voltage and current of the distribution network are no longer symmetrical, the power loss of the line increases, equipment damage, and voltage stability level lowered. In addition, due to the urgent need for smart grid construction, a large number of doubly-fed wind turbines...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the above defects or improvement needs of the prior art, the present invention provides a static voltage stability evaluation method for a three-phase unbalanced distribution network containing wind power. Static voltage stability is evaluated, thereby solving the technical problem in the prior art that the impact of load changes on voltage stability is not considered, resulting in inaccurate evaluation results

Images