CN204304432U - A kind of active filter - Google Patents
A kind of active filter Download PDFInfo
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- CN204304432U CN204304432U CN201420745255.6U CN201420745255U CN204304432U CN 204304432 U CN204304432 U CN 204304432U CN 201420745255 U CN201420745255 U CN 201420745255U CN 204304432 U CN204304432 U CN 204304432U
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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
- Y02E40/30—Reactive power compensation
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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
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The utility model relates to Review on Harmonic Restraining Technology in Power field, the utility model provides a kind of active filter, comprise controller, drive circuit, charging circuit, reactor, current/voltage Acquisition Circuit, passive filter and active filter, active filter comprises IGBT inverter and electric capacity, and IGBT inverter is together with Capacitance parallel connection; The input of the current output terminal linked reactor of IGBT inverter, the output of reactor connects the input of charging circuit, the input of the output connected with passive filter of charging circuit, and the output of passive filter connects electrical network; Controller is according to the output current of harmonic current signal, grid side voltage signal and compensating current signal adjustment IGBT inverter, the command signal of offset current is drawn according to the compensation of active filter, the harmonic wave that all can change frequency and amplitude carries out tracing compensation, filter range is wide, fast response time, filter capacity is strong, has multiple compensate function.
Description
Technical field
The utility model relates to Review on Harmonic Restraining Technology in Power field, particularly relates to a kind of active filter.
Background technology
Along with the development of modern industry, non-linear and time variation power electronic equipment is as the extensive use of inverter, rectifier and various Switching Power Supplies etc., the switch motion of these power electronic equipments is filled with a large amount of harmonic waves and order harmonic components in electrical network, result in the serious distortion of voltage and current waveform in AC network, reduce the power factor of electrical network, have a strong impact on the power supply quality of electrical network.Along with the development of power electronic technology, power supply quality is had higher requirement.Traditional harmonic suppressing method uses passive filter, it has that structure is simple, equipment investment is few, operating cost is lower, not only can compensation harmonic but also can the advantage such as compensating reactive power, this kind of method has very large drawback simultaneously, its volume is large, its filter effect is larger by the impact of power system impedance, easily and system generation parallel resonance, and specific secondary harmonic wave can only be eliminated.Therefore, the raising required along with power supply quality, only relies on traditional this passive filter to carry out harmonic inhabitation and can not meet the needs that power supply quality requires.In sum, exist in prior art and only use passive filter to carry out the problem that harmonic inhabitation can not meet power supply quality requirement.
Utility model content
The purpose of this utility model is to provide a kind of active filter, is intended to solve only use passive filter to carry out the problem that harmonic inhabitation can not meet power supply quality requirement for existing in prior art.
The utility model realizes like this, a kind of active filter, described active filter comprises controller, drive circuit, charging circuit, reactor, current/voltage Acquisition Circuit, passive filter and active filter, described active filter comprises IGBT inverter and electric capacity, and described IGBT inverter is together with Capacitance parallel connection;
The current output terminal of described IGBT inverter connects the input of described reactor, the output of described reactor connects the input of described charging circuit, the output of described charging circuit connects the input of described passive filter, and the output of described passive filter connects electrical network;
The input of the first input end connected nonlinearity load of described current/voltage Acquisition Circuit, second input of described current/voltage Acquisition Circuit connects the voltage end of described electrical network, 3rd input of described current/voltage Acquisition Circuit connects the output of described reactor, the output of described current/voltage Acquisition Circuit connects the first input end of described controller, described current/voltage Acquisition Circuit is for gathering the harmonic current signal of described nonlinear load, the compensating current signal of grid side voltage signal and described reactor output, and by described harmonic current signal, described grid side voltage signal and described compensating current signal send to described controller,
First output of described controller connects the input of described drive circuit, the output of described drive circuit connects the control end of described IGBT inverter, and described controller adjusts the output current of described IGBT inverter according to described harmonic current signal, described grid side voltage signal and described compensating current signal.
Described active filter comprises circuit breaker, and the input of described circuit breaker connects the output of described passive filter, and the output of described circuit breaker connects described electrical network.
Described active filter comprises surge protection circuit, and the input of described surge protection circuit connects the output of described passive filter, and the output of described surge protection circuit connects the input of described circuit breaker.
Described active filter comprises long-distance communication circuit, and the input of described long-distance communication circuit connects the second output of described controller, and the output of described long-distance communication circuit connects the second input of described controller.
Described long-distance communication circuit is wired remote communicating circuit or wireless telecommunication circuit, and described wireless telecommunication circuit is WIFI module or bluetooth module.
Described active filter comprises human-computer interaction device, and described human-computer interaction device is connected with described controller.
Described charging circuit comprises contactor and charging resistor, the first end of described charging resistor is the input of described charging circuit, second end of described charging resistor connects the input of described contactor, and the output of described contactor is the output of described charging circuit.
Described passive filter is LC passive filter.
The utility model provides a kind of active filter, compared with traditional passive filter harmonic suppressing method, use in the prior art on the basis of passive filter and increase active filter, by detecting the harmonic current signal in load current, tracing compensation is carried out with the harmonic wave all changed frequency and amplitude, filter range is wide, fast response time, filter capacity is strong, and there is multiple compensate function, do not need jumbo reactor and capacitor simultaneously, reduce volume and the cost of whole device to a great extent.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the utility model embodiment, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation of a kind of active filter that a kind of embodiment of the utility model provides;
Fig. 2 is the structural representation of a kind of active filter that the another kind of embodiment of the utility model provides.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
In order to the technical solution of the utility model is described, be described below by specific embodiment.
A kind of embodiment of the utility model provides a kind of active filter, as shown in Figure 1, active filter comprises controller 107, drive circuit 108, charging circuit 102, reactor 103, current/voltage Acquisition Circuit 106, passive filter 110 and active filter 104, active filter 104 comprises IGBT inverter 105 and electric capacity 111, IGBT inverter 105 and electric capacity 111 and is connected in parallel.
The input of the current output terminal linked reactor 103 of IGBT inverter 105, the output of reactor 103 connects the input of charging circuit 102, the input of the output connected with passive filter 110 of charging circuit 102, the output of passive filter 110 connects electrical network 101.
The input of the first input end connected nonlinearity load 109 of current/voltage Acquisition Circuit 106, second input of described current/voltage Acquisition Circuit 106 connects the voltage end of electrical network 101, the output of the 3rd input linked reactor 103 of current/voltage Acquisition Circuit 106, the first input end of the output connection control device 107 of current/voltage Acquisition Circuit 106, current/voltage Acquisition Circuit 106 is for gathering the harmonic current signal of nonlinear load 109, the compensating current signal of grid side voltage signal and reactor 103 output, and by harmonic current signal, grid side voltage signal and compensating current signal send to controller 107.
First output of controller 107 connects the input of drive circuit 108, the output of drive circuit 108 connects the control end of IGBT inverter 105, and controller 107 is according to the output current of harmonic current signal, grid side voltage signal and compensating current signal adjustment IGBT inverter 105.
For charging circuit 102, in the present embodiment, charging circuit 102 is formed primarily of contactor and bypass resistance, for realizing the energy snubber of active filter 104 in access procedure when accessing electrical network 101, because when active filter 104 drops into, if DC bus capacitor both end voltage is zero or too little, the anti-paralleled diode of IGBT inverter 105 inside will bear very large capacitance charging current, although the reactor 103 in system can have certain inhibitory action to this electric current, but this electric current still likely damages device more than the maximum permission forward peak current in anti-paralleled diode in IGBT inverter.
Concrete, charging circuit 102 comprises contactor and charging resistor, and the first end of charging resistor is the input of charging circuit, and the second end of charging resistor connects the input of contactor, and the output of contactor is the output of charging circuit.
For current/voltage Acquisition Circuit 106, in the present embodiment, concrete, current/voltage Acquisition Circuit 106 comprises voltage transformer, current transformer and signal conditioning circuit, the voltage of grid side is gathered by voltage transformer summation current transformer, the offset current of three-phase inverter outlet side in the harmonic current of nonlinear load and active filter, wherein PT represents three phase network side voltage signal, CT1 represents the offset current of APF active filter three-phase inverter outlet side, CT2 represents the harmonic current of nonlinear load, simultaneously through the process of signal conditioning circuit, converted to the d. c. voltage signal of 0 ~ 3V needed for controller 107 by signal conditioning circuit.
For drive circuit 108; in the present embodiment; for receiving the drive control signal that controller 107 exports; send IGBT inverter 105 to after this drive control signal being converted to the drived control level of actual IGBT inverter 105, sending control to after the IGBT error protection signal simultaneously exported by IGBT inverter 105 carries out level conversion is device.
Concrete, drive circuit 108 primarily of CONCEPT company 2SP0115T series IGBT driver and drive interconnecting module composition, adopt modular IGBT driver, realize the driving that IGBT is safe and reliable, strengthen the anti-interference of system.
For controller 107; in the present embodiment; for determining main performance and the index of active filter; control system has been used for the acquisition and processing of the signal such as voltage, electric current, the calculating of instruction current, the generation of switching strategy, the function such as output, system protection of pwm signal; and then send corresponding drive control signal to drive circuit; the signal that electric quantity signal and the drive circuit 108 of current/voltage Acquisition Circuit 106 detection send is judged simultaneously, realize the various defencive functions to whole system.
Concrete, TI company 32 floating point number signal processor TMS320F28335 that controller 107 adopts.
For reactor 103, for the voltage transitions of change is become actual offset current, realize the buffering of energy, reduce the switching harmonics in active filter output current simultaneously, reduce common mode disturbances.
For active filter 104, IGBT inverter 105 is core main circuits of active filter 104, adopt voltage source inverter, voltage support is carried out by parallel connection direct electric capacity, control it by controller and realize powerful conversion, realize the output of the suppression of harmonic wave and the compensation of reactive power simultaneously.
For passive filter 110, usually adopt LC passive filter, mainly assist and realize the harmonics restraint of system and the effect of reactive power compensation.
The another kind of embodiment of the utility model provides a kind of active filter, and as shown in Figure 2, active filter comprises circuit breaker 112, the output of the input connected with passive filter 110 of circuit breaker 112, and the output of circuit breaker 112 connects electrical network 101.
Further, active filter comprises surge protection circuit 113, and the input of surge protection circuit 113 connects the output of charging circuit 102.
Surge protection circuit 113 primarily of lightning arrester composition, effect be when system be struck by lightning or accidental short circuit time, the thunderbolt to active filter or short-circuit protection can be realized.
Further, active filter comprises long-distance communication circuit 114, the second output of the input connection control device 107 of long-distance communication circuit 114, the second input of the output connection control device 107 of long-distance communication circuit 114.
For long-distance communication circuit 114, communication can be realized with controller 107 under the communications protocol specified; Concrete, long-distance communication circuit 114 can be wired remote communication or wireless telecommunication, and wireless telecommunication can be WIFI module or bluetooth module.
Further, active filter comprises human-computer interaction device 115, and human-computer interaction device 115 is connected with controller 107, mainly for user provides friendly operation control and information display interface.
Operation principle and the process of the utility model active filter are as follows: the general principle of active filter detects harmonic wave from by target compensation, then one is produced with this harmonic current equal and opposite in direction but opposite polarity offset current (parallel connection type) or corresponding harmonic voltage (tandem type) by compensation arrangement, thus the harmonic current in elimination electrical network, make power network current only containing fundametal compoment.The structure of the parallel connection type that the utility model adopts, form primarily of two parts: harmonic and reactive currents voltage detecting circuit and offset current circuit for generating (controller, drive circuit and active filter three part is formed), the effect of current/voltage testing circuit detects harmonic wave in load current and idle component; The effect of offset current circuit for generating produces corresponding offset current according to the harmonic and reactive currents detected etc.
The groundwork process of the utility model device is: the voltage signal and the current signal that are detected nonlinear load by voltage and current transducer, then the instruction current arithmetic element of via controller calculates the command signal of offset current, PWM instruction is converted into again through pwm control signal unit, exported and the harmonic wave produced in load or reactive current equal and opposite in direction, offset current that phase place is contrary by the level conversion of drive circuit and then control inverter, the final harmonic current eliminated in electrical network obtains the source current of expectation.
The utility model active filter is compared with traditional passive filter harmonic suppressing method, and the utility model device does not need jumbo reactor, capacitor, reduces volume and the cost of whole device to a great extent.
Secondly, compared with traditional passive filter harmonic suppressing method, the utility model device is that the core of control system detects harmonic wave in load current and idle component with TMS320F28335, and draws the command signal of offset current according to the compensation object of active filter, and the harmonic wave that all can change frequency and amplitude carries out tracing compensation, energy filtering 2 ~ 50 simultaneously subharmonic, filter range is wide, fast response time, and filter capacity is strong, have multiple compensate function, adaptability is good.
Again, the utility model device front end is provided with LC passive filtration unit, adopts active filter and LC filter method used in combination, to reduce the capacity of active filter, reaches the object reducing costs, raise the efficiency.
Finally, the surge protection circuit in the utility model and the design of charging circuit, for system adds many protective barriers, make the reliability of system and fail safe comprehensively be promoted.
Above content is in conjunction with concrete preferred implementation further detailed description of the utility model, can not assert that concrete enforcement of the present utility model is confined to these explanations.For the utility model person of an ordinary skill in the technical field; make some equivalent alternative or obvious modification without departing from the concept of the premise utility; and performance or purposes identical, all should be considered as belonging to the scope of patent protection that the utility model is determined by submitted to claims.
Claims (8)
1. an active filter, it is characterized in that, described active filter comprises controller, drive circuit, charging circuit, reactor, current/voltage Acquisition Circuit, passive filter and active filter, described active filter comprises IGBT inverter and electric capacity, and described IGBT inverter is together with Capacitance parallel connection;
The current output terminal of described IGBT inverter connects the input of described reactor, the output of described reactor connects the input of described charging circuit, the output of described charging circuit connects the input of described passive filter, and the output of described passive filter connects electrical network;
The input of the first input end connected nonlinearity load of described current/voltage Acquisition Circuit, second input of described current/voltage Acquisition Circuit connects the voltage end of described electrical network, 3rd input of described current/voltage Acquisition Circuit connects the output of described reactor, the output of described current/voltage Acquisition Circuit connects the first input end of described controller, described current/voltage Acquisition Circuit is for gathering the harmonic current signal of described nonlinear load, the compensating current signal of grid side voltage signal and described reactor output, and by described harmonic current signal, described grid side voltage signal and described compensating current signal send to described controller,
First output of described controller connects the input of described drive circuit, the output of described drive circuit connects the control end of described IGBT inverter, and described controller adjusts the output current of described IGBT inverter according to described harmonic current signal, described grid side voltage signal and described compensating current signal.
2. active filter as claimed in claim 1, it is characterized in that, described active filter comprises circuit breaker, and the input of described circuit breaker connects the output of described passive filter, and the output of described circuit breaker connects described electrical network.
3. active filter as claimed in claim 2; it is characterized in that; described active filter comprises surge protection circuit, and the input of described surge protection circuit connects the output of described passive filter, and the output of described surge protection circuit connects the input of described circuit breaker.
4. active filter as claimed in claim 1, it is characterized in that, described active filter comprises long-distance communication circuit, and the input of described long-distance communication circuit connects the second output of described controller, and the output of described long-distance communication circuit connects the second input of described controller.
5. active filter as claimed in claim 4, it is characterized in that, described long-distance communication circuit is wired remote communicating circuit or wireless telecommunication circuit, and described wireless telecommunication circuit is WIFI module or bluetooth module.
6. active filter as claimed in claim 1, it is characterized in that, described active filter comprises human-computer interaction device, and described human-computer interaction device is connected with described controller.
7. active filter as claimed in claim 1, it is characterized in that, described charging circuit comprises contactor and charging resistor, the first end of described charging resistor is the input of described charging circuit, second end of described charging resistor connects the input of described contactor, and the output of described contactor is the output of described charging circuit.
8. active filter as claimed in claim 1, it is characterized in that, described passive filter is LC passive filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420745255.6U CN204304432U (en) | 2014-12-02 | 2014-12-02 | A kind of active filter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420745255.6U CN204304432U (en) | 2014-12-02 | 2014-12-02 | A kind of active filter |
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| CN204304432U true CN204304432U (en) | 2015-04-29 |
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| CN201420745255.6U Expired - Fee Related CN204304432U (en) | 2014-12-02 | 2014-12-02 | A kind of active filter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106849174A (en) * | 2017-03-31 | 2017-06-13 | 深圳市贝壳电气技术有限公司 | A kind of lift energy feedback circuit, device and electric life controller |
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2014
- 2014-12-02 CN CN201420745255.6U patent/CN204304432U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106849174A (en) * | 2017-03-31 | 2017-06-13 | 深圳市贝壳电气技术有限公司 | A kind of lift energy feedback circuit, device and electric life controller |
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| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150429 Termination date: 20191202 |
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| CF01 | Termination of patent right due to non-payment of annual fee |