Novel neutral line triple harmonic current suppressor

Abstract

The invention discloses a novel neutral line triple harmonic current suppressor, which comprises two LC circuits I and II and a zigzag transformer 5, wherein the two LC circuits I and II consist of capacitors and reactors; the LC circuit I is connected in series with a neutral line, a reactance end of the LC circuit I is connected with the neutral line at an input end of a low-voltage distribution network, a capacitance end of the LC circuit I is connected with the neutral line at a load side, three ends A, B and C of the zigzag transformer are connected with three-phase wires of the low-voltage distribution network, an N end of the zigzag transformer is connected with an reactance end of the LC circuit II, and a capacitance end of the LC circuit II is connected with the capacitance end of the LC circuit I. The neutral line triple harmonic current suppressor can overcome the influence of zero sequence voltage on the zigzag transformer on the basis of effectively suppressing the current of the neutral lines, and has little influence on the electrical energy quality of a user. The neutral line triple harmonic current suppressor has the advantages of simple circuit structure, low manufacturing cost, easy implementation, less influence on the zero sequence voltage of an electric network, good suppression effect on the neutral line triple harmonic current, and the like.

Description

technical field [0001] The invention belongs to the field of electric power technology, and in particular relates to a novel neutral line third harmonic current suppressor which can be used in a low-voltage distribution network to suppress the neutral line third harmonic current. Background technique [0002] With the development of science and technology and economy, large-scale shopping malls, office buildings, and residential quarters in cities continue to emerge, in which lighting, computers, copiers, and air conditioners are the main electrical equipment. The current lighting equipment is mostly new power electronic lamps such as LED, which are generally single-phase rectification equipment or thyristor voltage regulation; computers and copiers are also single-phase equipment, and are also rectification equipment; with the development of air conditioning technology, frequency conversion air conditioners are becoming more and more The more popular it is, its main circuit...

AI Technical Summary

Problems solved by technology

When using this method, the third harmonic of the access point of the device close to the user side is relatively large, which will seriously affect the power quality of the user, causing the user equipment to not work normally or even cause damage to the user equipment

[0005] The zigzag transformer method has no effect on the voltage of the access point, but the filtering effect is not ideal, and when the power supply voltage has a zero-sequence component, it is easy to cause the zigzag transformer to overcurrent or even burn out

In the low-voltage distribution network, the voltage asymmetry often exists, causing the equipment to be unable to be put into use or not to operate normally

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