Abstract:

Aiming at the problems that the existing sag evaluation index system has not been considered, the weighting method is not comprehensive and flexible, and the application of the sag risk evaluation method is not perfect, a GRA-TOPSIS evaluation model of voltage sag risk based on game theory weighting is proposed. First, the sensitive load failure rate model is established based on the normal distribution probability density function and the cumulative sum method. Then, a sag evaluation index system considering both the grid side and the user side is constructed, and the subjective and objective weight coefficients are integrated and combined using the game theory idea. According to the GRA-TOPSIS evaluation method, the node voltage sag risk evaluation calculation model is established. Finally, the results are verified by the measured data, which can prove the accuracy and practicability of the proposed method.

Key words: load failure rate, mitigation risk assessment, game theory combination weighting, gray relation analysis technique for order preference by similarity to ideal solution(GRA-TOPSIS) evaluation model, power quality