Distribution network unbalanced harmonic load index prediction method

Abstract

The present invention provides a distribution network unbalanced harmonic load index prediction method. The method comprises: establishing a time sequence of a distribution network unbalanced harmonic load index evolutionary system, processing measured data of the time sequence by a nonlinear simplex method, and performing reflection operation on a vertex target function value so as to perform prediction calculation of a distribution network unbalanced harmonic load index and obtain a prediction value of the distribution network unbalanced harmonic load index. According to the method provided by the present invention, the prediction calculation can be performed on the distribution network unbalanced harmonic load index according to monitored parameters, a harmonic level can be controlled in real time according to a calculation result; the harmonic unbalance phenomenon can be effectively avoided; and reliability and economy of a distribution network system can be significantly improved.

Description

technical field [0001] The invention belongs to the technical field of distribution network, in particular to a method for predicting unbalanced harmonic load index of distribution network. Background technique [0002] The distribution network and its many electrical equipment that generate harmonics constitute a complex system. How to predict and evaluate the unbalanced harmonic load index of the distribution network according to the operating characteristics of the distribution network and each electrical equipment, so that each distribution network It is one of the key issues related to the intelligent level of the distribution network. In the past, harmonic detection and control The method does not consider the level of unbalanced harmonics in the distribution network and its effect on the distribution network and the electrical equipment. Each system of the distribution network or the electrical equipment independently detects and controls the harmonics, and cannot con...

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Problems solved by technology

[0002] The distribution network and its many electrical equipment that generate harmonics constitute a complex system. How to predict and evaluate the unbalanced harmonic load index of the distribution network according to the operating characteristics of the distribution network and each electrical equipment, so that each distribution network It is one of the key issues related to the intelligent level of the distribution network. In the past, harmonic detection and control The method does not consider the level of unbalanced harmonics in the distribution network and its effect on the distribution network and the electrical equipment. Each system of the distribution network or the electrical equipment independently detects and controls the harmonics, and cannot control the distribution network. The coordination and synchronization of the harmonic unbalance of the whole network cannot effectively use the resources of the power grid, and the evaluation accuracy and utilization efficiency are not high. Therefore, real-time monitoring of the distribution network and its internal electrical equipment operating The monitoring parameters predict and calculate the unbalanced harmonic load index of the distribution network, and control the harmonic level in real time according to the calculation results, which can effectively avoid the phenomenon of harmonic imbalance and significantly improve the reliability and economy of the distribution network system

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