Harmonic source localization method based on orthogonal matching pursuit algorithm

Abstract

The invention discloses a harmonic source localization method based on an orthogonal matching pursuit algorithm. The harmonic source localization method for effective positioning of actual system harmonic source localization comprises: step A, establishing a measurement equation based on measurement information; step B, on the basis of an orthogonal matching pursuit algorithm, carrying out estimation of injected harmonic currents at a node; and step C, locating a main harmonic source based on the estimation result. According to the invention, an underdetermined problem of the measurement equation and a non-global and objective problem of the system due to shortage configuration of the existing measuring device are solved. While harmonic currents of some branches of the system network are obtained, injected harmonic currents of all nodes in the network are estimated precisely, the harmonic sources in the distribution network are located effectively, the investment costs are lowered, andthe basis is provided for harmonic responsibility division and harmonic control. Therefore, the method has the important significance in improving the power quality of the grid, reducing economic losses, and improving user satisfaction.

Description

technical field [0001] The invention relates to the technical field of power quality analysis, in particular to a harmonic source location method based on an orthogonal matching pursuit algorithm. Background technique [0002] With the wide application of power electronic devices in all walks of life, harmonic pollution in the power grid is becoming more and more prominent. It is inevitable that a large amount of harmonic current will be injected into the power grid during the operation of power electronic devices, which will cause voltage and current distortion in the power grid and affect the safe and stable operation of the power grid and electrical equipment. In order to understand the harmonic pollution in the power grid in time, to achieve the purpose of distinguishing the harmonic responsibilities and effectively controlling the harmonics, it is very important to correctly identify the main harmonic sources in the power grid. [0003] Harmonic source location is the ...

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Problems solved by technology

[0005] The harmonic source location method based on the equivalent circuit is simple in principle and easy to implement, but it is mainly aimed at the case of a single harmonic source, lacks integrity, and generally does not consider the time-varying nature of the power grid topology and branch parameters; the method based on harmonic state estimation The positioning results are relatively accurate, with overall observability, suitable for multi-harmonic source positioning, but more measurement data are required, the state quantity solution is more complicated, and the calculation amount is larger

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