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Shunt active power filter

A power filter, filter technology, applied in active power filter, AC network to reduce harmonics/ripples and other directions, can solve the problem of zero-sequence potential imbalance, electromagnetic interference, etc., to prevent interference, high anti-interference sexual effect

Active Publication Date: 2013-10-09
YANGZHOU HUADIAN ELECTRICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the problem of unbalanced zero-sequence potential existing in the current active power filter and the electromagnetic interference caused by the coexistence of strong electric signals and weak electric signals, and proposes a parallel active power filter

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0029] A shunt active power filter, such as Figure 1-3 As shown, the three-level inverter 1 is connected to six IGBT drive circuits 6, the IGBT drive circuit 6 is connected to the DSP control circuit 10, and the DSP control circuit 10 is connected to the load through the frequency multiplication phase-locking device 11 and the zero-crossing detection device 12. 13, and the other path of the DSP control circuit 10 is connected to the load 13 through the current conditioning device 14 and the current detection device 15, the current conditioning device 14 is connected to the three-level inverter 1 through the filter 2, and the filter 2 is also connected to the load 13 The three-level inverter 1 is provided with a clamping diode 4 , a switch tube 3 and a voltage dividing capacitor 5 connected in sequence, and the DSP control circuit 10 is connected to the three-level inverter 1 through a midpoint voltage detection device 16 .

[0030] The structure of the IGBT driving circuit is...

Embodiment 2

[0058] A shunt active power filter, such as Figure 1-3 As shown, the three-level inverter 1 is connected to six IGBT drive circuits 6, the IGBT drive circuit 6 is connected to the DSP control circuit 10, and the DSP control circuit 10 is connected to the load through the frequency multiplication phase-locking device 11 and the zero-crossing detection device 12. 13, and the other path of the DSP control circuit 10 is connected to the load 13 through the current conditioning device 14 and the current detection device 15, the current conditioning device 14 is connected to the three-level inverter 1 through the filter 2, and the filter 2 is also connected to the load 13 The three-level inverter 1 is provided with a clamping diode 4 , a switch tube 3 and a voltage dividing capacitor 5 connected in sequence, and the DSP control circuit 10 is connected to the three-level inverter 1 through a midpoint voltage detection device 16 .

[0059] The structure of the IGBT driving circuit is...

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Abstract

The invention discloses a shunt active power filter belonging to the technical field of an active power filter technology. The filter comprises three level inverters, a filter body, a switch tube, a clamp diode, a voltage-dividing capacitor, and six IGBT (insulated gate bipolar translator) drive circuits with two paths of signal output. The drive circuit adopted by the shunt active power filter includes a high-speed optocoupler inside; and a pulse control signal is isolated with inside of the drive circuit, so that electric isolation is achieved by a digital control circuit and the drive circuit; interference caused by electrical coupling can be prevented; gate drive adopts bipolar control voltage; and high anti-interference performance can be obtained by using negative grid voltage.

Description

technical field [0001] The invention belongs to the technical field of active power filtering, and in particular relates to a parallel active power filter. Background technique [0002] Electric energy is an indispensable and important energy in the production of modern society and people's life. With the development of society and the advancement of science and technology, especially the wide application of power electronic devices, on the one hand, the harmonic pollution in the power system increases with the number of nonlinear loads. On the other hand, the power supply side and its power system equipment, users and their electrical appliances have higher and higher requirements for power quality. The increasingly serious harmonic pollution and the higher and higher power quality requirements have formed A pair of sharp contradictions. Due to power quality problems, the harmonics of my country's metallurgical, railway, mining and other enterprises have seriously exceeded...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01
CPCY02E40/20
Inventor 毕青春
Owner YANGZHOU HUADIAN ELECTRICAL CO LTD
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