High-voltage distribution network reactive power planning method for preventing capacitive reactive power reverse transmission

Abstract

The invention discloses a high-voltage power distribution network reactive power planning method for preventing capacitive reactive power reverse transmission. According to the method, a comprehensive reactive power planning model which comprises a reactor and a capacitor and considers power factor constraints is built; according to the model, the simultaneous configuration of the capacitor and the reactor in a high-voltage power distribution system is considered, a minimum sum of reactive compensation equipment investment and active power loss cost in a planning period is taken as an objective function, node power factor constraints are added in the constraints; an improved genetic algorithm based on power factor reactive sensitivity is proposed; and the proposed model is solved, so thata capacitor and reactor reactive planning scheme is obtained; time-sharing switching is carried out in peak and valley periods, the power factor constraints can be met, capacitive reactive power is prevented from being reversely transmitted to a superior power grid; and the problems of reactive power reverse transmission and power factor out-of-limit occur when the high-voltage power distribution network with the peak and valley difference increasing day by day is in low load are solved.

Description

technical field [0001] The invention relates to a reactive power planning method for a high-voltage distribution network that prevents capacitive reactive power transfer. Background technique [0002] At present, the line parameters and load characteristics of large-scale urban high-voltage distribution networks are showing new changes. In terms of load characteristics, the peak-to-valley difference of power grid load is showing an increasing trend; in terms of line parameters, since the original high-voltage overhead distribution network is gradually transformed into a cable network, the capacitive reactive charging power of the line is far beyond the past. In large cities represented by Shanghai, the daily maximum peak-to-valley difference rate has exceeded 40%, and the cable conversion rate of 110kV lines has exceeded 60%. Under the new development trend, the problem of excess capacitive reactive power under the low-valley load operation state is becoming more and more p...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the defects of the prior art, provide a reactive power planning method for high-voltage distribution network that prevents capacitive reactive power transfer, establish a reactive power planning model, and adopt an improved genetic algorithm based on power factor reactive power sensitivity Solve the optimal reactive power planning model

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