CN203352174U - Tri-level parallel active electric power filter - Google Patents
Tri-level parallel active electric power filter Download PDFInfo
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- CN203352174U CN203352174U CN2013203825505U CN201320382550U CN203352174U CN 203352174 U CN203352174 U CN 203352174U CN 2013203825505 U CN2013203825505 U CN 2013203825505U CN 201320382550 U CN201320382550 U CN 201320382550U CN 203352174 U CN203352174 U CN 203352174U
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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 utility model discloses a tri-level parallel active electric power filter. The tri-level parallel active electric power filter comprises a three-phase load current detection unit, an inverter three-phase output current detection unit, an electrical network voltage three-phase voltage detection unit, a direct current side capacitor voltage detection unit, a tri-level PWM wave output control unit, an active filter grid connected power supply air switch, a low voltage charging over resistance bypass switch, a DSP28335 module, an upper and lower host communication module and a three-phase inverter. Compared with the prior art, over current generated by an output inductor in a charging process is greatly reduced through low voltage charging over resistance, a switch tube is effectively protected in a capacitor charging process, so stable grid connected operation of the active electric power filter is guaranteed, the tri-level parallel active electric power filter is enabled to have higher control precision by an enhanced DSP28335 control chip, tri-level control technology makes a parallel active electric power filter to have smaller interference on an electrical network, moreover, manufacturing cost of the output inductor is saved.
Description
Technical field
The utility model three level parallel Active Power Filter-APFs, what relate to is electric and electronic technical field, specifically the intelligent Shunt of a kind of electric power system.
Background technology
Along with the fast development of power electronics, microelectric technique, computer technology, a large amount of efficient electrical power electronic equipments are widely used.The use of some non-linear equipments such as Novel charging station for electric automobile, frequency-variable controller, make the electric parameters such as voltage in electric power system, electric current harmonic component occur, had a strong impact on industrially normally to carry out.Intelligent grid represents the up-to-date direction that world today's power system development is changed, and one of them vital task must improve the quality of power supply and power supply reliability.
The important trend that harmonic wave suppresses is to adopt Active Power Filter-APF, its basic principle is to detect harmonic current from target compensation, produce one with this harmonic current equal and opposite in direction and opposite polarity offset current by compensation arrangement, thereby make power network current only containing fundametal compoment.The harmonic wave that this filter can all change frequency and amplitude is followed the tracks of compensation, and compensation performance is not subject to the impact of electric network impedance, has a good application prospect.At present, although the existing variation that detects, follows the tracks of load current, and there is the control three-phase inverter to produce the reported in literature of corresponding compensation harmonic current digital Active Power Filter-APF, but the harmonic current control strategy mainly adopts two level SVPWM control modes, though can obtain relatively good compensation effect based on this control mode, but because the self-characteristic of two level hardware circuits exists, equipment self can inject a certain amount of switching frequency harmonic wave to electrical network, and, in order to suppress the switching frequency harmonic wave, must select larger grid-connected inductance with its impact on electrical network of filtering.
The utility model content
The purpose of this utility model is to overcome above-mentioned defect, the DSP28335 that is 150M based on dominant frequency, adopt three level SVPWM control technologys, realize that totally digitilized harmonic wave detects and Current Control Strategy, design a kind of simple in structure, anti-electrical network interference performance is strong, and the harmonic current that can effectively administer in electrical network suppresses self interference to electrical network simultaneously.Three level parallel Active Power Filter-APFs detect at startup, harmonic wave, Current Control realizes full-automatic operation, realize that the electrical network quality of power supply meets three level parallel Active Power Filter-APFs of national standard.
Its technical scheme is: comprise the threephase load current detecting unit, inverter three-phase output electric current measure unit, the grid voltage three-phase voltage detection unit, the DC capacitor voltage detecting unit, three-level pwm ripple output control unit, active filter network source air switch, the low pressure resistance by-pass switch that charged, the DSP28335 module, upper and lower seat in the plane communication module, three-phase inverter is interior, it is characterized in that: the threephase load current detecting unit, inverter three-phase output electric current measure unit, the grid voltage three-phase voltage detection unit, the DC capacitor voltage detecting unit is connected with the AD sampling unit of DSP28335 module respectively, 12 road PWM output unit delivery outlets of DSP28335 module connect three-level pwm ripple output control unit, be connected with source filter network source air switch and the low pressure resistance by-pass switch that charged by the IO mouth of DSP28335 module, the low pressure resistance by-pass switch two ends of charging are parallel with the low pressure resistance that charged, upper and lower seat in the plane communication module is connected by the communication Peripheral Interface with the DSP28335 module, and three-level pwm ripple output control unit is connected with three-phase inverter, described three-phase inverter adopts three-phase diode clamper type tri-level inversion circuit, draws three lines, through output inductor, is connected in three-phase 380V electrical network, and the described low pressure resistance by-pass switch two ends of charging are parallel with the low pressure resistance that charged.
Obvious advantage and the effect implemented after this technology are: compared with prior art, the low pressure resistance that charged reduces the overcurrent produced on outputting inductance in charging process greatly, protection switch pipe in the capacitor charging process, guaranteed steadily being incorporated into the power networks of Shunt effectively; Enhancement mode DSP28335 control chip makes the control precision of three level parallel active filters higher, and three level control technologys make Shunt self less to the interference of electrical network, the cost of manufacture of simultaneously saving outputting inductance.
The accompanying drawing explanation
The structural representation that Fig. 1 is the intelligent Shunt of the utility model;
Wherein, charged resistance by-pass switch, 8-DSP28335 module, the upper and lower seat in the plane of 9-communication module, 10-three-phase inverter of 1-threephase load current detecting unit, 2-inverter three-phase output electric current measure unit, 3-grid voltage three-phase voltage detection unit, 4-DC capacitor voltage detecting unit, 5-three-level pwm ripple output control unit, 6-active filter network source air switch, 7-low pressure.
Embodiment
Below in conjunction with accompanying drawing, the utility model is further described:
See accompanying drawing 1, threephase load current detecting unit 1, inverter three-phase output electric current measure unit 2, grid voltage three-phase voltage detection unit 3, DC capacitor voltage detecting unit 4 are connected with the AD sampling unit of DSP28335 module 8 respectively; 12 road PWM output unit delivery outlets of DSP28335 module 8 connect the output of three-level pwm ripple and control single 5, be connected with source filter network source air switch 6 and the low pressure resistance by-pass switch 7 that charged by the IO mouth of DSP28335 module 8, low pressure resistance by-pass switch 7 two ends of charging are parallel with the low pressure resistance that charged, upper and lower seat in the plane communication module 9 is connected by the communication Peripheral Interface with DSP28335 module 8, and three-level pwm ripple output control unit 5 is connected with three-phase inverter 10; Three-phase inverter 10 adopts three-phase diode clamper type tri-level inversion circuit, draws three lines, through output inductor, is connected in three-phase 380V electrical network.
See accompanying drawing 1, before operation, charged resistance by-pass switch 7 of low pressure disconnects, electrical network charged resistance to the charging of the DC bus capacitor of three-phase inverter 10 by low pressure, when DC capacitor voltage detecting unit 4 detects DC capacitor voltage near 500V the time, send control signal by DSP28335, the low pressure resistance by-pass switch 7 that charged closes, and Active Power Filter-APF in parallel enters the state of being incorporated into the power networks.
During operation, detect threephase load electric current and inverter three-phase output current by threephase load current detecting unit 1 and inverter three-phase output electric current measure unit 2, detect three phase network voltage by grid voltage three-phase voltage detection unit 3, the threephase load current signal, inverter three-phase output current signal and three phase network voltage signal are by threephase load current detecting unit 1, inverter three-phase output electric current measure unit 2 and grid voltage three-phase voltage detection unit 3 are inputted respectively the AD sampling unit of DSP28335 module 8, after DSP28335S module 8 series of computation, send the PWM ripple to three-level pwm ripple output control unit 5, thereby control opening or turn-offing of three-phase inverter, export the electric current reverse with load harmonic current through out put reactor to electrical network, and filter by filtering capacitor the high order harmonic component that three-phase inverter 10 is produced by the SVPWM carrier frequency, eliminate the harmonic components of power network current, thereby improve the electrical network quality of power supply.
Claims (3)
1. three level parallel Active Power Filter-APFs, comprise the threephase load current detecting unit, inverter three-phase output electric current measure unit, the grid voltage three-phase voltage detection unit, the DC capacitor voltage detecting unit, three-level pwm ripple output control unit, active filter network source air switch, the low pressure resistance by-pass switch that charged, the DSP28335 module, upper and lower seat in the plane communication module, three-phase inverter is interior, it is characterized in that: the threephase load current detecting unit, inverter three-phase output electric current measure unit, the grid voltage three-phase voltage detection unit, the DC capacitor voltage detecting unit is connected with the AD sampling unit of DSP28335 module 8 respectively, 12 road PWM output unit delivery outlets of DSP28335 module connect three-level pwm ripple output control unit, be connected with source filter network source air switch and the low pressure resistance by-pass switch that charged by the IO mouth of DSP28335 module, the low pressure resistance by-pass switch two ends of charging are parallel with the low pressure resistance that charged, upper and lower seat in the plane communication module is connected by the communication Peripheral Interface with the DSP28335 module, and three-level pwm ripple output control unit is connected with three-phase inverter.
2. three level parallel Active Power Filter-APFs according to claim 1 is characterized in that: described three-phase inverter adopts three-phase diode clamper type tri-level inversion circuit, draws three lines, through output inductor, is connected in three-phase 380V electrical network.
3. three level parallel Active Power Filter-APFs according to claim 1 is characterized in that: the described low pressure resistance by-pass switch two ends of charging are parallel with the low pressure resistance that charged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203825505U CN203352174U (en) | 2013-06-28 | 2013-06-28 | Tri-level parallel active electric power filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203825505U CN203352174U (en) | 2013-06-28 | 2013-06-28 | Tri-level parallel active electric power filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203352174U true CN203352174U (en) | 2013-12-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013203825505U Expired - Fee Related CN203352174U (en) | 2013-06-28 | 2013-06-28 | Tri-level parallel active electric power filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203352174U (en) |
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2013
- 2013-06-28 CN CN2013203825505U patent/CN203352174U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131218 Termination date: 20180628 |
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| CF01 | Termination of patent right due to non-payment of annual fee |