Multi-harmonic source responsibility division method and device based on phase-free data

Abstract

The invention discloses a multi-harmonic source responsibility division method based on phase-free data. The method comprises the steps of collecting a harmonic voltage at a public connection point PCC under each harmonic frequency in a system, the phase difference information between the harmonic voltages of the feeder lines, the amplitude of a harmonic current of each feeder line and the phase difference information between the harmonic currents of the feeder lines; calculating the active power and the reactive power of each feeder line under different harmonic frequencies; calculating the sum of the active power and the sum of the reactive power of each feeder line in the system under the h-th harmonic frequency; estimating the total harmonic impedance of the system through a partial least square method; calculating the contribution voltage of each feeder line; and calculating the harmonic responsibility of each feeder line. According to the present invention, the calculation precision and the calculation efficiency of the harmonic parameters can be improved, thereby further improving the electric energy quality, and guaranteeing the safe operation of a power grid and the normalpower utilization of a power consumer. The invention further discloses a multi-harmonic source responsibility division device based on the phase-free data.

Description

technical field [0001] The invention relates to the technical field of harmonic responsibility division in the field of power quality, in particular to a multi-harmonic source responsibility division method and device based on phase-free data. Background technique [0002] As power electronic devices and various non-linear, impact and asymmetrical loads are connected to the power grid, the harmonic problem of the power grid is becoming increasingly prominent. Harmonics can cause electromagnetic relay protection devices to malfunction or refuse to operate. Power equipment is affected by harmonics, resulting in greater additional loss, increased heat production, and shortened life. High-order harmonics increase the harmonic impedance of the line, and harmonics The current will cause the loss of the line to increase; in addition, the communication line will also be adversely affected by the existence of harmonics. [0003] The power quality problem caused by harmonic pollution...

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Problems solved by technology

[0006] In actual measurement, it is difficult to obtain the respective phase information of harmonic voltage and harmonic current, which will lead to the failure of existing estimation methods. If artificially constructed phase methods are used, such as random phase method and phase position zero method, although Avoid the failure of existing methods but the uncontrollable errors introduced thereby will reduce the estimation accuracy

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