CN213846628U

CN213846628U - Combined harmonic filter

Info

Publication number: CN213846628U
Application number: CN202022728495.3U
Authority: CN
Inventors: 李福元; 李宾; 王佩明; 李志刚
Original assignee: Anhui Zhaosheng New Energy Technology Co ltd
Current assignee: Anhui Zhaosheng New Energy Technology Co ltd
Priority date: 2020-11-23
Filing date: 2020-11-23
Publication date: 2021-07-30
Anticipated expiration: 2030-11-23

Abstract

A combined harmonic filter comprises a reactor, a capacitor bank, an input terminal, an output terminal and a magnetic core, wherein the magnetic core is of a structure like a Chinese character 'tian', and is composed of a first core column, a second core column, a first iron yoke, a second iron yoke and a third iron yoke, the first core column is arranged on the upper surface of the second iron yoke at equal intervals, the second core column is arranged on the lower surface of the second iron yoke at equal intervals, the first iron yoke is arranged at the upper end of the first core column, the third iron yoke is arranged at the lower end of the second core column, and air gaps are further formed in the first core column and the second core column; the reactor consists of a first reactor and a second reactor, the first reactor is sleeved on the first core column, one end of the first reactor is connected with the input terminal, and the other end of the first reactor is connected with the output terminal; the second reactor is sleeved on the second core column, one end of the second reactor is connected with the capacitor bank arranged on the side in series, and the other end of the second reactor is connected with the first reactor. The reactors are connected in series and in parallel in different connection modes by enabling the reactors to share the core column, and the purpose of improving the working efficiency on the premise of reducing the size is met.

Description

Combined harmonic filter

Technical Field

The utility model relates to a power electronic equipment field, in particular to modular harmonic filter.

Background

With the large application of frequency converters and similar electronic systems in recent years, current harmonics with unit times of 5, 7, 11 and 13 times in a power grid are increased continuously, the maximum percentage of the harmonics can reach 80%, and serious pollution is caused to the power transmission grid. At present, the main way of handling the harmonic wave is to add a passive filter with lower cost at the input end of the power grid, but the passive filter is limited by the capacity of the equipment, and the proportion of the harmonic wave in the circuit after filtering by the general passive filter is still close to 20% and is far greater than 5% required by GB/T14549. The problems of high cost, large equipment volume and the like are caused by the fact that multi-stage filtering equipment is required to be added continuously to correct the circuit.

SUMMERY OF THE UTILITY MODEL

In order to realize the purpose of the utility model, the utility model adopts the technical scheme that:

a combined harmonic filter comprises a reactor, a capacitor bank, an input terminal, an output terminal and a magnetic core, and is characterized in that,

the magnetic core is of a structure like a Chinese character 'tian', and consists of a first core column, a second core column, a first iron yoke, a second iron yoke and a third iron yoke, wherein the first core column is arranged on the upper surface of the second iron yoke at equal intervals, the second core column is arranged on the lower surface of the second iron yoke at equal intervals, the first iron yoke is arranged at the upper end of the first core column, the third iron yoke is arranged at the lower end of the second core column, and air gaps are further arranged on the first core column and the second core column;

the reactor consists of a first reactor and a second reactor, the first reactor is sleeved on the first core column, one end of the first reactor is connected with the input terminal, and the other end of the first reactor is connected with the output terminal;

the second reactor is sleeved on the second core column, one end of the second reactor is connected with the capacitor bank arranged on the side in series, and the other end of the second reactor is connected with the first reactor;

the electric reactor further comprises a clamping piece and screws, and the screws are used for fixing the first electric reactor, the second electric reactor and the capacitor bank on the clamping piece.

In a preferred embodiment of the present invention, the first reactor is composed of two reactors with different parameters connected in series.

In a preferred embodiment of the present invention, the number of the first core columns is at least 3, and the first reactor, the second reactor and the first core column may be in the form of a single-phase single column, a single-phase two column, a single-phase three column, a three-phase four column or a three-phase five column.

In a preferred embodiment of the present invention, the number of the second core columns is at least 3, and the third reactor and the second core columns may be formed as a single-phase single column, a single-phase two column, a single-phase three column, a three-phase four column, or a three-phase five column.

The beneficial effects of the utility model reside in that:

according to the combined harmonic filter, the reactors are connected in series and in parallel in different connection modes by enabling the reactors to share the core column, and the purpose of improving the working efficiency on the premise of reducing the size is met.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.

Fig. 1 is a core column structure diagram of the present invention.

Fig. 2 is a perspective view of the present invention.

Fig. 3 is a side view of the present invention.

Fig. 4 is an electrical schematic diagram of the present invention.

Detailed Description

The detailed structure of the present invention will be further described with reference to the accompanying drawings and the detailed description.

Referring to a combined harmonic filter of fig. 1, three core legs 7 are respectively disposed on the upper surface of the yoke 6b in an equidistant and perpendicular manner, and the upper portions of the core legs 7 are disposed on the lower surface of the yoke 6a in the same manner. Three legs 8 are also provided on the lower surface of the yoke 6b in an equidistant and perpendicular manner, respectively, and the lower portions of the legs 8 are provided on the upper surface of the yoke 6c in the same manner. Thus, the

iron yokes

6a, 6b, 6 c; the stem 7 and the stem 8 are integrally combined in a structure of a "shape of Chinese character tian". An air gap 10 is also arranged on the middle point of the long sides of the core columns 7 and 8. The core column may be segmented, and the material of the core column may be amorphous, nanocrystalline, metal powder core (such as iron silicon/iron silicon aluminum/iron nickel), ferrite, and the like. According to different design requirements, insulating paper or insulating plates with different thicknesses can be filled into the outer surface of the sensor to achieve the required sensing quantity.

Referring to fig. 2 and 3, the total of six windings of the reactor 2 and the windings of the reactor 3 are respectively fitted over the three core legs 8, the core leg 8, the yokes 6a and the yokes 6b are shared by the reactor 2 and the reactor 3, and the windings of the reactor 4 are fitted over the three core legs 7. The reactor 2, the reactor 3, and the reactor 4 constitute a three-phase three-column form, respectively. Input terminals 2aa, 2ab, and 2ac and output terminals 3aa, 3ab, and 3ac are provided on outer side surfaces of reactor 2 and reactor 3, one sides of input terminals 2aa, 2ab, and 2ac are connected to reactor 2, and the other sides are connected to an external system circuit, and one sides of output terminals 3aa, 3ab, and 3ac are connected to reactor 3, and the other sides are also connected to the external system circuit. A capacitor bank 12 is also provided on one side of the

reactors

2, 3, 4. One end of the reactor 4 is connected to the reactor 2 and the reactor 3, and the other end is connected to the capacitor bank 12. The

reactors

2, 3, 4 and the capacitor bank 12 are each fastened to the clamp 1 by screws 9 to form an assembly part.

Referring to fig. 4 in combination, the reactor 2 and the reactor 3 are connected in series and then connected in series to the system circuit, and the reactor 4 and the capacitor bank 12 are connected in series and then connected in parallel to the system circuit. The series resonance frequency of the reactor 4 and the capacitor bank is 250Hz, the inductance of the reactor 2 is 55 percent of that of the reactor 4, the inductance of the reactor 3 is 6 percent of that of the reactor 4, when the reactor 2 and the reactor 3 are connected in series, a new reactor 5 is formed, the inductance of the reactor 5 is equal to that of the reactor 4, and the total inductance of the reactor 5 is 16 times that of the original reactor 3. The inductance L of the reactor 4 and the capacitance C of the capacitor bank 12 are calculated according to the formula, where f is 1/(2 pi √ LC). Where f is 250Hz (5 times the fundamental 50 Hz).

Claims

1. A combined harmonic filter comprises a reactor, a capacitor bank, an input terminal, an output terminal and a magnetic core, and is characterized in that,

2. A combined harmonic filter according to claim 1, characterized in that the first reactor consists of two reactors with different parameters connected in series.

3. A combined harmonic filter according to claim 1 wherein the number of first legs is at least 3, and the first reactor, the second reactor and the first leg are in the form of a single-phase single leg, a single-phase two leg, a single-phase three leg, a three-phase four leg or a three-phase five leg.

4. A combined harmonic filter according to claim 1, wherein the number of the second legs is at least 3, and the third reactor and the second legs are formed in the form of a single-phase single-leg, a single-phase two-leg, a single-phase three-leg, a three-phase four-leg, or a three-phase five-leg.