CN211151551U

CN211151551U - Hybrid active power filter device composed of APF and L C filters

Info

Publication number: CN211151551U
Application number: CN202020197225.1U
Authority: CN
Inventors: 孙建如; 安涛
Original assignee: Shijiazhuang Herbertson Electric Co ltd
Current assignee: Shijiazhuang Herbertson Electric Co ltd
Priority date: 2020-02-23
Filing date: 2020-02-23
Publication date: 2020-07-31
Anticipated expiration: 2030-02-23

Abstract

The utility model relates to a mixed type active power filter device that APF and L C wave filter are constituteed, including three phase line and, IGBT bridge and triangle electric capacity, three phase line is do not connected in the three minute of triangle electric capacity, triangle electric capacity includes three first electric capacity C1 that is the triangular connection and parallelly connected first resistance R1 with first electric capacity C1, the three angle of triangle electric capacity respectively with be connected with first inductance L1 between the three phase line the utility model discloses have and reduce the harmonic effect.

Description

Hybrid active power filter device composed of APF and L C filters

Technical Field

The utility model belongs to the technical field of the active power filter technique and specifically relates to a mixed type active power filter device that APF and L C wave filter are constituteed.

Background

An Active Power Filter (APF) is a new Power electronic device for dynamically suppressing harmonic waves and compensating reactive Power, and can compensate the harmonic waves with variable size and frequency and the reactive Power with variable size and frequency.

The active filter is called as active, and the device needs to provide power supply (for compensating the harmonic of the main circuit) as the name suggests, the application of the active filter can overcome the defects of the traditional harmonic suppression and reactive compensation methods (the traditional method can only carry out fixed compensation) such as L C filter, the dynamic tracking compensation is realized, and the harmonic and the reactive can be compensated.

When the harmonic wave enters the power grid, the high-voltage capacitor of the transformer substation is subjected to overcurrent and overload. At this time, the reactive power compensation device will not operate normally. And if the harmonic wave is worse, the harmonic wave in the power grid can be further amplified.

SUMMERY OF THE UTILITY MODEL

To the not enough that prior art exists, one of the purposes of the utility model is to provide a mixed type active power filter device that APF and L C wave filter are constituteed, have the effect that reduces the harmonic.

The above utility model discloses an above-mentioned utility model purpose can realize through following technical scheme:

the utility model provides a hybrid active power filter device that APF and L C wave filter are constituteed, includes three phase line and IGBT bridge, still includes the triangle electric capacity, three phase line is connected respectively to three angle of triangle electric capacity, the triangle electric capacity includes that three is first electric capacity C1 of triangular connection and with first electric capacity C1 parallelly connected first resistance R1, three angles of triangle electric capacity respectively with three phase line between be connected with first inductance L1.

Further, a first switch K1 is arranged between the phase line and the first inductor L1.

Furthermore, a second switch K2 is connected in parallel at two ends of the first switch K1, and a current limiting resistor R2 is connected in series on a branch where the second switch K2 is located.

Further, an electric fuse FU is connected in series between the first switch K1 and the phase line.

Furthermore, the IGBT bridge comprises six IGBT electric energy transducers, and the two IGBT electric energy transducers are connected in series and then connected in parallel to form the IGBT bridge.

Further, the IGBT bridge is connected with a charging capacitor C2 in parallel.

To sum up, the utility model discloses a following at least one useful technological effect, first electric capacity C1 in the triangular capacitor constitutes L C filter circuit with first inductance L1 in the phase line respectively and both can eliminate the harmonic and can compensate reactive power to first electric capacity C1 constitutes resistance-capacitance absorption protection circuit with first resistance R1.

Drawings

Fig. 1 is a circuit diagram of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1, for the utility model discloses a hybrid active power filter device that APF and L C filter constitute, including electric fuse FU, current-limiting resistor R2, first inductance L1, the triangle capacitance that three first electric capacity C1 constitutes, first resistance R1, IGBT bridge and the electric capacity C2 that charges.

From the output end of the three-phase line, the phase line is connected with the electric fuse FU in series and then connected with the first switch K1 in series, the first switch K1 is connected with the first inductor L1 in series, the three corners of the three-phase capacitor are respectively connected with the back of the first inductor L1, the two ends of the first capacitor C1 are connected with the first resistor R1 in parallel, and the last phase line is connected with the IGBT bridge.

Two ends of the first switch K1 are connected in parallel with a second switch K2, and a branch where the second switch K2 is located is connected in series with a current limiting resistor R2.

The IGBT bridge comprises six IGBT electric energy transducers, and the two IGBT electric energy transducers are connected in series and then connected in parallel to form the IGBT bridge.

The IGBT bridge is connected with a charging capacitor C2 in parallel.

The implementation principle of the embodiment is as follows:

the electric fuse FU is fused when the current is too large so as to protect the electric appliance at the rear.

The current limiting resistor R2 is provided so that the inrush current flowing into the dc capacitor through the power converter is limited to a certain extent.

The L C filter circuit formed by the first inductor L1 and the first capacitor C1 can eliminate harmonic waves and compensate reactive power.

The first capacitor C1 and the first resistor R1 form a rc absorption protection circuit.

The IGBT bridge employs high frequency pulse width modulation to generate the required compensation current waveform.

And the charging capacitor C2 filters the peak voltage and keeps the voltage stable.

The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims

1. A hybrid active power filter device composed of an APF and L C filter comprises three phase lines and an IGBT bridge and is characterized by further comprising a triangular capacitor, three angles of the triangular capacitor are respectively connected with the three phase lines, the triangular capacitor comprises three first capacitors C1 connected in a triangular mode and a first resistor R1 connected with the first capacitors C1 in parallel, and first inductors L1 are connected between the three angles of the triangular capacitor and the three phase lines respectively.

2. The hybrid active power filter device composed of APF and L C filters according to claim 1, wherein a first switch K1 is provided between the phase line and the first inductor L1.

3. The hybrid active power filter device composed of APF and L C filters according to claim 2, wherein a second switch K2 is connected in parallel with two ends of the first switch K1, and a current limiting resistor R2 is connected in series with a branch where the second switch K2 is located.

4. The device of claim 2, wherein an electrical fuse FU is connected in series between the first switch K1 and the phase line.

5. The hybrid active power filter device composed of the APF and L C filters according to claim 1, wherein the IGBT bridge comprises six IGBT power transducers, and two IGBT power transducers are connected in series and then connected in parallel to form the IGBT bridge.

6. The device of claim 1, wherein the IGBT bridge is connected in parallel with a charging capacitor C2.