CN1335669A - Tracking active power filter - Google Patents
Tracking active power filter Download PDFInfo
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- CN1335669A CN1335669A CN 00112420 CN00112420A CN1335669A CN 1335669 A CN1335669 A CN 1335669A CN 00112420 CN00112420 CN 00112420 CN 00112420 A CN00112420 A CN 00112420A CN 1335669 A CN1335669 A CN 1335669A
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Abstract
The present invention is one tracking active power filter. One filter unit comprising voltage pre-amplifier and voltage folloiwng power stage is connected serially to between the switching current transformer after simple passive filtering and the load, so that the waveform in the load follows completely the reference signal and is unchanged to different load, resistive, inductive, capacitive, SCR or their combination, and different magnitude. The ripple voltage in the voltage controlling geminate transistors in saturated and the filter unit has high efficiency. The present invention can realize optimized wave powering.
Description
The present invention relates to a kind of electric filtering technology, particularly a kind of active power filter.
By turn-offing that power converter that power electronic device constitutes with pulse-width modulation mechanism powers to the load or in the process of electrical network feed, often need carry out filtering according to the green degree demand of load or electrical network, passive, active or hybrid filtering technique commonly used achieves the goal.Existing filtering mode makes current transformer resist load disturbance, adapts to all kinds of loads the ability of (resistive, capacitive, perception, controllable silicon or its combination) and keeps the ability of waveform consistency very limited.
Purpose of the present invention will overcome problems of the prior art exactly, and a kind of tracking active power filter is provided, and is used for improving the carrying load ability and the workload-adaptability of power convertor assembly under the prerequisite that keeps equal filter effect.
Tracking active power filter of the present invention, be characterized in: it comprises the signal source 1 that produces signal, the voltage amplification unit 2 that the signal that signal 1 is sent carries out voltage amplification, signal after 2 amplifications of voltage amplification unit is followed the power of output to pipe follower 3, the sampling unit 4 of taking a sample from voltage amplification unit 2, sampled signal is carried out the switching converter 5 that the switch unsteady flow produces the switching voltage waveform, the output waveform of switching converter is carried out the passive filter 6 that small parameter does not have source waveform, passive filter 6 output have ripple and the signal signal source same waveform as the working power of power to pipe follower 3.
Because the present invention utilizes voltage follow effect and the high input impedance charcteristic of power to the pipe follower, so this device has the waveform consistency when being with resistive, perceptual, capacitive, controllable silicon etc. and combination load thereof, when being with heavy duty, have the waveform consistency, can realize the random waveform conversion of power stage efficiently to underloading.
Below in conjunction with accompanying drawing the present invention is further described.
Fig. 1 is a block diagram of the present invention.
Fig. 2 is a kind of combinational circuit of power of the present invention to the pipe follower.
Fig. 3 is the another kind of combinational circuit of power of the present invention to the pipe follower
The tracking mode active filter is by voltage amplification unit 2, power is formed pipe follower 3 and sampling unit 4, with signal source 1, switching converter 5, it is the switch of feature that passive filter 6 is formed jointly with tracking mode active power filtering technology---linear hybrid power current transformer is to load 7 power supplies.
Among Fig. 1, the signal that signal source 1 is sent is after voltage amplification unit 2 amplifies, as the voltage drive of power: the Signal-controlled switch current transformer that obtains through sampling unit 4 by voltage amplification unit 2 (for example PWM current transformer) 5 on the other hand to pipe follower 3, produce the output waveform of switching voltage waveform (for example pulse-width modulation), through than the passive filter 6 of small parameter roughly after the filtering, also contain superposition with the signal source same waveform as on ripple.This ripple through overpower to pipe during follower 3, all harmonic voltages fall on to pipe, can be controlled in the saturation voltage drop magnitude of pipe.Wherein a pipe flows through positive half cycle current, and another pipe flows through negative half-cycle current.Because power, makes the big voltage signal same frequency that obtains in the load 7 fully exporting with voltage amplification unit 2, same-phase to the voltage follow effect and the high input impedance charcteristic of pipe follower 3, with the power stage voltage of shape; And make this compound convertor assembly when being with resistive, perceptual, capacitive, controllable silicon etc. and combination load thereof, have the waveform consistency, have the waveform consistency in the band heavy duty during to underloading, so can realize the random waveform conversion of power stage efficiently.
Obviously, sampling unit 4 can save, and by signal source 1 direct control switch current transformer 5, but the reliability of this measure is not as good as the situation that sampling unit 4 is set.
Power in accompanying drawing 1 does not connect load but gets access to grid the output of pipe follower 3, and the signal of signal source 1 be can't help this machine and produced, but when being taken a sample by line voltage, the function of apparatus of the present invention will be the power frequency electric energy to the excellent ripple of electrical network feedback.
Realizing above-mentioned the confession in the feed function course with tracking mode active power filtering technology, the core component efficient of pipe follower 3 being made of voltage amplification unit 2, power of the present invention can reach 98%, and the multiple combining form of it and critical component signal source 1, passive filter 6, load 7 can be illustrated by Fig. 2 and Fig. 3.
In accompanying drawing 2, power is composed in series by the voltage-controlled device T1 of homotype, T2 pipe follower 3, power stage voltage Vab complete cycle of passive filter 6 output band ripples, voltage amplification unit 2 provides, synchronous big voltage Vgg ＇ synchronous, same frequently with the output Vab of passive filter 6, and amplitude is a little less than the ripple voltage of Vab; Obtain the smooth voltage of amplitude a little less than the signal of voltage amplification unit 2 generations at load 7 two ends.Positive half cycle voltage at the band ripple is done the time spent, and electric current holds the voltage-controlled device T1 that flows through, load 7, diode D2 to get back to the b end by a; Negative half period voltage at the band ripple is done the time spent, and electric current holds the voltage-controlled device T2 that flows through, load 7, diode D1 to return a end by b.
In accompanying drawing 3, power is composed in series (N, P raceway groove matched pair transistor) to pipe follower 3 by the voltage-controlled device T1 of abnormal shape, T2, and voltage amplification unit 2 output voltage V g execute control to the public gate pole of voltage-controlled device T1, T2.Other function is identical with accompanying drawing 2.
Even cascaded structure means pipe is damaged, only be equivalent to lack the one-level active power filtering, performance reduces, and does not constitute the threat to complete machine.
Embodiment 1: accompanying drawing 2 modes once were used to improve the power supply quality of civil power.Certain device needs the sinusoidal distortion factor to power less than 2% power supply, and utility grid distortion factor index instability, the test result when directly influencing the device transformation load.Signal source 1 between civil power and equipment therefor in the adding accompanying drawing 2, voltage amplification unit 2, power are to pipe follower 3 assembled units, make signal source 1 and power network signal synchronous, promptly inserted tracking mode active filter of the present invention, wherein the local signal source 1 sinusoidal distortion factor own is set less than 0.5%, can meet the demands.
Embodiment 2: the performance index of transforming the PWM-VVVF frequency conversion speed-adjusting system.Variable-frequency governor is ear-piercing less than the audio noise of starting of 20KHZ scope and operation at switching frequency, switching frequency be higher than 20KHZ superaudio scope hard, the operation, though the thorn ear noise is disappeared, but switching process, pulse current rise, the radio frequency content of trailing edge increases, and are harmful to health equally; Soft switch and electromagnetic compatibility procedure can't satisfy the requirement of going up capacitance grade; In addition PWM mode VVVF frequency converter overcome low-speed torque ripple and zero passage radially chatter also be a technological difficulties problem, from control solve complicated.The inventor is connected in series the voltage amplification unit 2 in the accompanying drawing 3, power between the voltage output end and motor windings (being equivalent to the load 7 among the figure) of VVVF frequency converter to the tracking mode compound filter that pipe follower 3, sampling unit 4, passive filter Unit 6 constitute, and with signal source in this machine of VVVF frequency converter as the signal source among Fig. 31, the result makes winding obtain pure sine wave electric current and voltage power supply; And do not need to set silent-sound switching frequency, at a few KHZ switching frequencies audio frequency, radio frequency noise are disappeared, low-speed torque ripple is suppressed to greatest extent, just almost can compare with the closed-loop system of direct torque control under open loop condition.
Claims (3)
1, a kind of tracking active power filter, it is characterized in that: it comprises the signal source (1) that produces signal, the voltage amplification unit (2) that the signal that signal source (1) is sent carries out voltage amplification, the power of the signal after voltage amplification unit (2) amplification being followed output is to pipe follower (3), the sampling unit (4) of taking a sample from voltage amplification unit (2), sampled signal is carried out the switching converter (5) that the switch unsteady flow produces the switching voltage waveform, the output waveform of switching converter is carried out the passive filter (6) of small parameter passive filtering, passive filter (6) output have ripple and the signal signal source same waveform as the working power of power to pipe follower (3).
2, a kind of tracking active power filter according to claim 1 is characterized in that: described power is composed in series by the voltage-controlled device of homotype pipe follower (3).
3, a kind of tracking mode electric power according to claim 1 is characterized in that at source filter: described power is composed in series by the voltage-controlled device of abnormal shape pipe follower (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00112420 CN1127195C (en) | 2000-07-26 | 2000-07-26 | Tracking active power filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00112420 CN1127195C (en) | 2000-07-26 | 2000-07-26 | Tracking active power filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1335669A true CN1335669A (en) | 2002-02-13 |
| CN1127195C CN1127195C (en) | 2003-11-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00112420 Expired - Fee Related CN1127195C (en) | 2000-07-26 | 2000-07-26 | Tracking active power filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1127195C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101873057A (en) * | 2009-04-27 | 2010-10-27 | 三垦电气株式会社 | Active filter and power inverter |
| US8451925B2 (en) | 2007-09-27 | 2013-05-28 | Lenovo (Beijing) Limited | Method and pre-corrector for correcting signals in radio frequency links |
-
2000
- 2000-07-26 CN CN 00112420 patent/CN1127195C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8451925B2 (en) | 2007-09-27 | 2013-05-28 | Lenovo (Beijing) Limited | Method and pre-corrector for correcting signals in radio frequency links |
| CN101873057A (en) * | 2009-04-27 | 2010-10-27 | 三垦电气株式会社 | Active filter and power inverter |
| CN101873057B (en) * | 2009-04-27 | 2013-03-06 | 三垦电气株式会社 | Active power filter and power converting device |
| TWI450488B (en) * | 2009-04-27 | 2014-08-21 | Sanken Electric Co Ltd | Active filter device and power conversion device |
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| Publication number | Publication date |
|---|---|
| CN1127195C (en) | 2003-11-05 |
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Addressee: Huabao Electrical Co., Ma'anshan Document name: Notification of registration; notice of patent for invention |
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Granted publication date: 20031105 Termination date: 20090826 |