CN102496936A - Active power filtering system for frequency converter - Google Patents
Active power filtering system for frequency converter Download PDFInfo
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- CN102496936A CN102496936A CN2011104317727A CN201110431772A CN102496936A CN 102496936 A CN102496936 A CN 102496936A CN 2011104317727 A CN2011104317727 A CN 2011104317727A CN 201110431772 A CN201110431772 A CN 201110431772A CN 102496936 A CN102496936 A CN 102496936A
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- active power
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- power filter
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/20—Active power filtering [APF]
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Abstract
The invention discloses an active power filtering system for a frequency converter. The system comprises an active power filter and a group of reactors, wherein the active power filter is connected in parallel with the frequency converter; the reactors are connected in series with the frequency converter; a wire outlet end of each reactor is connected with the frequency converter; and a wire inlet end of each reactor is connected in parallel with the active power filter and then connected with the low-voltage side of a power transformer. Through the structure, the active power filter is transformed, and the active power filtering system has the advantages that: 1, the filtering effect is good, primary filtration is performed by connecting the reactors in series, and the harmonic filtering rate is improved by about 10% based on the performance of the active power filter; 2, the operation reliability is high, and the reactors connected in series with the frequency converter can effectively isolate the frequency converter from the external power grid; and 3, the economic performance is better; although the active power filter is relatively expensive, the harmonic content is reduced through the reactors connected in series with the frequency converter, thus the required capacity of the active power filter is correspondingly reduced, and investment is correspondingly reduced, wherein the investment can be reduced by about 20% according to the practical engineering.
Description
Technical field
The present invention relates to the electric filtering field, relate in particular to a kind of active power filtering system that is used for frequency converter.
Background technology
Frequency converter is in the industrial occasions extensive use at present, and converter plant also produces power quality problems such as serious harmonic pollution when improving efficiency, optimizing technology.And often this transient state or transient power quality problem are bigger than traditional problem to the loss that enterprise brings, and the output and the economic benefit of enterprise takes place to influence greatly if any accident.
At present, solve the harmonic problem that frequency converter brings, the way that mainly solves is the installing electric-power filter, specifically can be divided into two kinds of devices of Active Power Filter-APF and passive power filter.Active Power Filter-APF is based on the novel filter apparatus of electronic power inverter, advantages such as response speed is fast, filtering performance is good that it has, and still, Active Power Filter-APF involves great expense, and this has seriously hindered it and has applied.Frequency converter is at present a lot of topmost harmonic sources of industrial applications, and from technological layer, Active Power Filter-APF is to the best harmonic wave control mode of frequency converter; But because the frequency converter harmonic content reaches, if direct using active electric-power filter, the compensation capacity that needs is bigger; Invest very highly, be limited to factors such as fund, technology, the majority that uses at present is a passive power filter; Though can bring into play great role; But it exists volume big, and filter effect receives system parameter variations to influence shortcomings such as bigger, and passive filter also possibly cause the bigger amplification of certain subharmonic under specific circumstances; Thereby influence the safe operation of filter and other power consumption equipments, so limitation is arranged.
Summary of the invention
Technical problem to be solved by this invention is the deficiency to prior art; A kind of active power filtering system that is used for frequency converter is provided; To reach stability and the filtering performance that improves filtering system, reduce the configuration capacity of Active Power Filter-APF, thereby reduce the cost of active filter system.
For solving the problems of the technologies described above; Technical scheme of the present invention is a kind of active power filtering system that is used for frequency converter; It is characterized in that; It comprises and Active Power Filter-APF and one group of reactor of connecting with frequency converter of frequency converter parallel connection that the leading-out terminal of described reactor is connected with frequency converter, is connected with the power transformer low-pressure side after the end of incoming cables of reactor and the described Active Power Filter-APF parallel connection.
Described Active Power Filter-APF is made up of detecting unit, control unit, current transformer, energy-storage units, charging inrush current prevention circuit and filter circuit; Detection step down side three-phase voltage, load-side three-phase current, Active Power Filter-APF three-phase output current and energy-storage units direct voltage are sent detected signal into control unit and are carried out after the computational analysis current transformer and energy-storage units being controlled.
Described detecting unit is made up of voltage sensor and current sensor; Described control unit is amplified by A/D converter, digital signal processor DSP, signal and electric isolation, drive circuit are formed, and voltage sensor and current sensor carry out the voltage/current signals of gathering to output control signals to current transformer and energy-storage units through signal amplification and electricity isolation, drive circuit after data processing and the computational analysis through A/D converter, digital signal processor DSP.
The three-phase bridge circuit that described current transformer is made up of high-speed power electronic switching device IGBT, described energy-storage units is made up of direct current capacitor, and the output of described three-phase bridge circuit is connected with charging inrush current prevention circuit through filter circuit.
A kind of active power filtering system that is used for frequency converter owing to adopted said structure, has transformed Active Power Filter-APF, through to the frequency converter series reactor, has realized combined filter.Be a system scheme of electric filtering aspect, this active power filtering stability of a system is better, and filtering performance is more excellent.Compare with single Active Power Filter-APF, have following advantage: 1, good wave filtering effect, carry out elementary filtering through series reactor, on the basis of Active Power Filter-APF performance, the harmonic filtration rate improves about 10%; 2, operational reliability is higher, and the reactor of connecting with frequency converter can effectively be isolated frequency converter and extraneous electrical network; 3, economic performance is better, and the Active Power Filter-APF price is higher, but has reduced harmonic content through the reactor of connecting with frequency converter, and the corresponding reduction of demand capacity to Active Power Filter-APF drops into corresponding reduction, and actual according to engineering, investment can reduce about 20%; 4, compare with passive power filter, the invention belongs to the active power filtering category, overcome many shortcomings of passive power filter, and filter effect is more excellent.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is done further detailed explanation;
Fig. 1 is a kind of active power filtering system block diagram that is used for frequency converter of the present invention;
Fig. 2 is an Active Power Filter-APF circuit theory sketch map shown in Figure 1;
In Fig. 1, Fig. 2,1, Active Power Filter-APF; 2, reactor; 3, detecting unit; 4, control unit; 5, energy-storage units; 6, current transformer; 7, filter circuit; 8, charging inrush current prevention circuit.
Embodiment
As shown in Figure 1, Fig. 1 is a structured flowchart of the present invention, and it comprises: Active Power Filter-APF 1 and one a group reactor of with frequency converter connecting 2 parallelly connected with frequency converter; The leading-out terminal of the reactor 2 of described and frequency converter series connection is connected with frequency converter, the end of incoming cables of reactor 2 and 1 parallelly connected then the connection with the power transformer low-pressure side of described Active Power Filter-APF; Be connected with the power transformer low-pressure side after the end of incoming cables parallel connection of described Active Power Filter-APF 1 and described reactor 2.
The reactor 2 of connecting with frequency converter can be a three-phase reactor; Also can be three single-phase reactors; The magnetic flux density of its inductance value and reactor, current density value should be designed by the technical professional, otherwise possibly influence the normal operation of reactor 2 itself and frequency converter.
Referring to Fig. 2, Fig. 2 is the circuit theory sketch map of Active Power Filter-APF.Active Power Filter-APF is made up of detecting unit 3, control unit 4, current transformer 6, energy-storage units 5, charging inrush current prevention circuit 8 and filter circuit 7; Detecting unit 3 detects step down side three-phase voltage, load-side three-phase current, Active Power Filter-APF three-phase output current and energy-storage units direct voltage, detected signal is sent into control unit 4 carry out after the computational analysis current transformer 6 and energy-storage units 5 being controlled; Detecting unit 3 is made up of voltage sensor and current sensor; Control unit 4 is amplified by A/D converter, digital signal processor DSP, signal and electricity is isolated, drive circuit is formed; The three-phase bridge circuit that current transformer 6 is made up of high-speed power electronic switching device IGBT; Described energy-storage units 5 is made up of direct current capacitor; Charging inrush current prevention circuit 8 is made up of contactor J1, J2 and resistance R 1, R2, R3; Filter circuit 6 is composed in series by inductance L, resistance R and capacitor C, the high fdrequency component of output during the work of filtering Active Power Filter-APF.
When Active Power Filter-APF started, charging inrush current prevention circuit 8 was closed with contactor J1 earlier, through resistance R 1, R2, R3 and 5 chargings of 6 pairs of energy-storage units of current transformer; After charging is accomplished; Contactor J2 is closed, and with resistance R 1, R2, R3 excision, Active Power Filter-APF begins normal operation then; Charging inrush current prevention circuit 8 can effectively suppress excessive shoving to the infringement of current transformer 6 and energy-storage units 5 in the starting process.
The present invention is through playing the effect of elementary filtering to the frequency converter series reactor; Play buffer action simultaneously; Can protect load; Carry out depth filtering through Active Power Filter-APF again, filtering performance is more excellent on the whole, and the whole comparable single Active Power Filter-APF of harmonic filtration rate improves about 10%.
Combine accompanying drawing that the present invention has been carried out exemplary description above; Obviously the concrete realization of the present invention does not receive the restriction of aforesaid way; As long as the various improvement of having adopted method design of the present invention and technical scheme to carry out; Or directly apply to other occasion without improvement, all within protection scope of the present invention.
Claims (4)
1. active power filtering system that is used for frequency converter; It is characterized in that; It comprises Active Power Filter-APF (1) and one group of reactor of connecting with frequency converter (2) with the frequency converter parallel connection; The leading-out terminal of described reactor (2) is connected with frequency converter, and the end of incoming cables of reactor (2) is connected with the power transformer low-pressure side with described Active Power Filter-APF (1) parallel connection back.
2. the active power filtering system that is used for frequency converter according to claim 1; It is characterized in that described Active Power Filter-APF (1) is made up of detecting unit (3), control unit (4), current transformer (6), energy-storage units (5), charging inrush current prevention circuit (8) and filter circuit (7); Detecting unit (3) detects step down side three-phase voltage, load-side three-phase current, Active Power Filter-APF three-phase output current and energy-storage units direct voltage, detected signal is sent into control unit (4) carry out after the computational analysis current transformer (6) and energy-storage units (5) being controlled.
3. the active power filtering system that is used for frequency converter according to claim 2; It is characterized in that; Described detecting unit (3) is made up of voltage sensor and current sensor; Described control unit (4) is amplified by A/D converter, digital signal processor DSP, signal and electric isolation, drive circuit are formed, and voltage sensor and current sensor carry out the voltage/current signals of gathering to output control signals to current transformer (6) and energy-storage units (5) through signal amplification and electricity isolation, drive circuit after data processing and the computational analysis through A/D converter, digital signal processor DSP.
4. the active power filtering system that is used for frequency converter according to claim 2; It is characterized in that; The three-phase bridge circuit that described current transformer (6) is made up of high-speed power electronic switching device IGBT; Described energy-storage units (5) is made up of direct current capacitor, and the output of described three-phase bridge circuit is connected with charging inrush current prevention circuit (8) through filter circuit (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104317727A CN102496936A (en) | 2011-12-20 | 2011-12-20 | Active power filtering system for frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104317727A CN102496936A (en) | 2011-12-20 | 2011-12-20 | Active power filtering system for frequency converter |
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| CN102496936A true CN102496936A (en) | 2012-06-13 |
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| CN2011104317727A Pending CN102496936A (en) | 2011-12-20 | 2011-12-20 | Active power filtering system for frequency converter |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030160515A1 (en) * | 2002-01-15 | 2003-08-28 | Luke Yu | Controllable broad-spectrum harmonic filter (cbf) for electrical power systems |
| CN101282043A (en) * | 2008-04-30 | 2008-10-08 | 青岛盘古电气有限公司 | Novel electric power filter |
| CN201323454Y (en) * | 2008-12-06 | 2009-10-07 | 大庆油田有限责任公司 | Combined type filter |
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2011
- 2011-12-20 CN CN2011104317727A patent/CN102496936A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030160515A1 (en) * | 2002-01-15 | 2003-08-28 | Luke Yu | Controllable broad-spectrum harmonic filter (cbf) for electrical power systems |
| CN101282043A (en) * | 2008-04-30 | 2008-10-08 | 青岛盘古电气有限公司 | Novel electric power filter |
| CN201323454Y (en) * | 2008-12-06 | 2009-10-07 | 大庆油田有限责任公司 | Combined type filter |
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Application publication date: 20120613 |