Harmonic responsibility distinguishing method considering background harmonic voltage

Abstract

The invention discloses a harmonic responsibility distinguishing method considering background harmonic voltage, comprising the following steps: (1) collecting voltage and current signals at a point of common coupling PCC of a distribution network and a current signal at the head end of a user feeder; (2) acquiring the harmonic components of the collected signals; (3) calculating the lumped power and lumped active power of each harmonic at the point of common coupling PCC of the distribution network; (4) screening and separating the harmonics at the point of common coupling PCC of the distribution network; (5) acquiring the lumped equivalent conductance and harmonic equivalent conductance at the point of common coupling PCC of the distribution network; (6) calculating the three-phase current of background harmonic; (7) calculating the lumped power and lumped active power of each harmonic at the head end of the user feeder; (8) screening and separating the harmonics at the head end of the user feeder; (9) calculating the three-phase harmonic current of the feeder at an Mth user side; and (10) distinguishing the harmonic responsibility. The harmonic responsibility can be precisely located to each user, the content and component of each user's harmonic can be accurately calculated, and fair punishment can be carried out.

Description

technical field [0001] The invention belongs to the technical field of harmonic responsibility distinction, and in particular relates to a harmonic responsibility distinction method including background harmonic voltage. Background technique [0002] In recent years, distributed power sources such as solar power and wind power are directly connected to the distribution network, which brings new harmonic problems to the distribution network, which increases the background harmonic voltage on the system side of the distribution network, while the existing The method for distinguishing harmonic responsibilities does not take into account the background harmonic voltage, which will lead to large errors in the quantification of harmonic responsibilities. A large number of equipment containing power electronic devices is connected to the distribution network, which also distorts the power supply current, and the harmonic pollution is becoming more and more serious. Harmonic curre...

AI Technical Summary

Problems solved by technology

The second category is the division of harmonic responsibilities in a distributed multi-bus system, that is, a network with multiple common connection points. The state estimation theory is mainly used to determine which bus system the harmonic source is located in. It is necessary to accurately grasp the network structure and harmonic impedance during calculation. and the harmonic components of the system, but it is difficult to obtain relevant data in practical applications

The third type is the load impedance method, which can only qualitatively determine whether the user is a harmonic source, but cannot determine the user's harmonic content and harmonic components

Because the harmonic current level at the PCC point cannot represent the real level of harmonics of each user, this will lead to power quality disputes and unclear responsibilities for harmonics. When power quality problems occur, liability penalties cannot be imposed

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