CN205123258U - Active electric power filter - Google Patents
Active electric power filter Download PDFInfo
- Publication number
- CN205123258U CN205123258U CN201520907211.3U CN201520907211U CN205123258U CN 205123258 U CN205123258 U CN 205123258U CN 201520907211 U CN201520907211 U CN 201520907211U CN 205123258 U CN205123258 U CN 205123258U
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- Prior art keywords
- current
- peak
- pwm drive
- drive singal
- power cell
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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]
Abstract
The utility model discloses an active electric power filter, the utility model discloses an active electric power filter includes power unit, current transformer, hall sensor, controller and peak limiting circuit, the controller is connected with current transformer and hall sensor respectively, according to non - linear load's electric current, calculates the harmonic current who needs the compensation, carry out preset peak limiting to the harmonic current of needs compensation after, according to hall sensor's feedback current, carry out the closed -cycle control to it again, the last harmonic current who compensates as required produces corresponding PWM drive signal, PWM drive signal transmits to power unit behind the peak limiting circuit, makes drive power unit produce corresponding output current to the peak limiting circuit is according to hall sensor's feedback current, the PWM drive signal's of restriction process pulse width. The utility model discloses even when the peak value overflows, shutdown protection does not cause the device to damage and can guarantee furthest's compensation harmonic current yet.
Description
Technical field
The utility model includes active power filter technical field, particularly a kind of Active Power Filter-APF.
Background technology
Active filter is mainly bucking-out system harmonic current, and when the very large and active filter off-capacity of the harmonic current capacity of system, compensation capacity will reach the heap(ed) capacity of active filter.In current system, the proportion of high order harmonic component is also comparatively large, and not only available capacity is comparatively large to cause the capacity that finally need compensate, and momentary output also can be comparatively large, and particularly transient current spike is easy to make system to occur exceed capacity and self-protection.
The way of current most self-protection carries out peak value overcurrent stoppage protection to the output current of Active Power Filter-APF power stage unit; damage to avoid the excessive power model that causes of system peak electric current; this method can play the effect of protection IGBT power model; but shutting down because of the system failure can not the harmonic current of normal compensatory system; particularly system occur in short-term resonance time; power system capacity transient state can easily exceed compensation standard, can result in greater loss to user.
Utility model content
The purpose of this utility model is to overcome above-mentioned deficiency existing in prior art; be intended to solve when the output current of Active Power Filter-APF power stage unit carries out peak value overcurrent stoppage protection; can not the harmonic current of normal compensatory system, the problem of the loss that user is larger can be caused.
In order to realize above-mentioned utility model object, the utility model provides a kind of Active Power Filter-APF, it is connected on the transmission line of electrical network and nonlinear load, for the harmonic current of compensation network, it comprises power cell, current transformer, Hall element, controller and peak limiter circuit; Wherein,
Described current transformer is arranged on the circuit that electrical network is connected with nonlinear load, for gathering the electric current of described nonlinear load;
Described Hall element is arranged on the circuit of described power cell output, for detecting the output current of described power cell, and produces corresponding feedback current according to the output current of described power cell; The output current of wherein said power cell is used for the harmonic current in compensation network;
Described controller is connected with described current transformer and described Hall element respectively, for the electric current according to described nonlinear load, calculate the harmonic current needing to compensate, after given peak-limitation is carried out to the harmonic current of described needs compensation, again according to the feedback current of described Hall element, closed-loop adjustment is carried out to it, finally according to the described harmonic current needing to compensate, produces corresponding PWM drive singal;
Described controller is by described peak limiter circuit, described PWM drive singal is transferred to described power cell, corresponding output current is produced for driving described power cell, and described peak limiter circuit is according to the feedback current of described Hall element, the pulse duration of the described PWM drive singal of restriction process, damages because of overcurrent for preventing described power cell.
According to a kind of concrete execution mode, described peak limiter circuit comprises forward peak-limitation branch road and negative peak restriction branch road, and described PWM drive singal comprises forward PWM drive singal and negative sense PWM drive singal; And, described forward PWM drive singal is after described forward peak-limitation branch road, drive the forward IGBT power tube of described power cell, described negative sense PWM drive singal, after described negative peak restriction branch road, drives the negative sense IGBT power tube of described power cell.
According to a kind of concrete execution mode, described forward peak-limitation branch road and described negative peak restriction branch road are by comparator, d type flip flop and form with door; Wherein,
In described forward peak-limitation branch road, the normal phase input end access peak-limitation of described comparator is with reference to positive voltage+Vref, and its inverting input accesses the feedback current of described Hall element, and its output is connected to the RESET input of described d type flip flop; The input end of clock of described d type flip flop accesses described forward PWM drive singal, its data input pin and the common stable connection voltage source Vcc of set input, and its data output end is connected with door input with described; Describedly access described forward PWM drive singal with another input of door, its output is connected with the drive end of described forward IGBT power tube;
In described negative peak restriction branch road, the normal phase input end of described comparator accesses the feedback current of described Hall element, and its inverting input access peak-limitation is with reference to negative voltage-Vref, and its output is connected to the RESET input of described d type flip flop; The input end of clock of described d type flip flop accesses described negative sense PWM drive singal, its data input pin and the common stable connection voltage source Vcc of set input, and its data output end is connected with door input with described; Describedly access described negative sense PWM drive singal with another input of door, its output is connected with the drive end of described negative sense IGBT power tube.
According to a kind of concrete execution mode, the circuit that described power cell exports also is provided with filter unit, for carrying out filtering to the output current of described power cell;
Described power cell also comprises bus capacitor, and the current harmonics for reducing switching frequency enters described electrical network.
Compared with prior art, the beneficial effects of the utility model:
The utility model in order to resolution system load steady state or dynamically Instantaneous Harmonic capacity exceedes Active Power Filter-APF compensation capacity time; carry out the peak current restriction of software and hardware; make active electric power filter to output current within normal scope; reach and can either protect IGBT power model simultaneously also can bucking-out system harmonic wave as far as possible; system is normally run, avoids causing damage to user.
Accompanying drawing explanation
Fig. 1 is the structural representation of the utility model Active Power Filter-APF;
Fig. 2 is the structural representation of a kind of embodiment of the utility model Active Power Filter-APF;
Fig. 3 is that the utility model controller carries out the oscillogram after peak-limitation to harmonic current;
Fig. 4 is the structural representation of the utility model peak limiter circuit;
Fig. 5 is the limit procedure schematic diagram that the utility model forward peak limiter circuit limits PWM drive singal;
Fig. 6 is the oscillogram of the positive PWM drive singal of the A phase of the utility model power cell;
Fig. 7 is the oscillogram of the negative PWM drive singal of the A phase of the utility model power cell.
Embodiment
Below in conjunction with embodiment, the utility model is described in further detail.But this should be interpreted as that the scope of the above-mentioned theme of the utility model is only limitted to following embodiment, all technology realized based on the utility model content all belong to scope of the present utility model.
The structural representation of the utility model Active Power Filter-APF as shown in Figure 1; Wherein, Active Power Filter-APF of the present utility model is connected on the transmission line of electrical network and nonlinear load, and for the harmonic current of compensation network, it comprises power cell, current transformer, Hall element, controller and peak limiter circuit.
Wherein, current transformer is arranged on the circuit that electrical network is connected with nonlinear load, for gathering the electric current of nonlinear load.
Hall element is arranged on the circuit of power cell output, for the output current of detection power unit, and produces corresponding feedback current according to the output current of power cell; Wherein the output current of power cell is used for the harmonic current in compensation network.
Controller is connected with current transformer and Hall element respectively, for the electric current according to nonlinear load, calculate the harmonic current needing to compensate, after carrying out given peak-limitation to needing the harmonic current compensated, again according to the feedback current of Hall element, closed-loop adjustment is carried out to it, the harmonic current finally compensated as required, produce corresponding PWM drive singal.
Controller passes through peak limiter circuit, PWM drive singal is transferred to power cell, corresponding output current is produced for driving power unit, and peak limiter circuit is according to the feedback current of Hall element, the pulse duration of the PWM drive singal of restriction process, damages because of overcurrent for preventing power cell.
The structural representation of a kind of embodiment of the utility model Active Power Filter-APF as shown in Figure 2; Wherein, the circuit that power cell exports also is provided with filter unit, for carrying out filtering to the output current of power cell.Power cell also comprises bus capacitor, enters electrical network for the current harmonics reducing switching frequency.
The utility model controller as shown in Figure 3 carries out the oscillogram after peak-limitation to harmonic current; Wherein, detect the A phase load electric current in electrical network, and calculate A phase harmonic current by controller, carry out the restriction of forward peak value and negative peak for A phase harmonic current, the part exceeding restriction point is all set to the current value limiting point.Controller according to the harmonic current after restriction process, produces corresponding PWM drive singal again.
The structural representation of the utility model peak limiter circuit as shown in Figure 4; Peak current limit circuit comprises forward peak-limitation branch road and negative peak restriction branch road, and PWM drive singal comprises forward PWM drive singal and negative sense PWM drive singal.Further, forward PWM drive singal is after forward peak-limitation branch road, and the forward IGBT power tube of driving power unit, negative sense PWM drive singal limits after branch road through negative peak, the negative sense IGBT power tube of driving power unit.
Concrete, forward peak-limitation branch road and negative peak restriction branch road are by comparator, d type flip flop and form with door.
Wherein, in forward peak-limitation branch road, the normal phase input end access peak-limitation of comparator is with reference to positive voltage+Vref, and the feedback current of its inverting input access Hall element, its output is connected to the RESET input of d type flip flop.The input end of clock access forward PWM drive singal of d type flip flop, its data input pin and the common stable connection voltage source Vcc of set input, its data output end is connected with door input; Access forward PWM drive singal with another input of door, its output is connected with the drive end of forward IGBT power tube.
In negative peak restriction branch road, the feedback current of the normal phase input end access Hall element of comparator, its inverting input access peak-limitation is with reference to negative voltage-Vref, and its output is connected to the RESET input of d type flip flop.The input end of clock access negative sense PWM drive singal of d type flip flop, its data input pin and the common stable connection voltage source Vcc of set input, its data output end is connected with door input; Access negative sense PWM drive singal with another input of door, its output is connected with the drive end of negative sense IGBT power tube.
Forward peak limiter circuit is as shown in Figure 5 to the limit procedure schematic diagram of PWM drive singal; Wherein, waveform Ia is the harmonic current that power cell exports for compensating A phase, waveform PWMAH is the forward PWM drive singal of A phase, waveform 1 is the comparator output waveform of forward peak limiter circuit, waveform 2 is the output waveform of the data output end of d type flip flop, and waveform PWM_AH is the PWM drive singal for driving forward IGBT power tube.
Waveform Ia is corresponding with waveform PWMAH, when waveform Ia exceeds the part of peak reference positive voltage+Vref, correspondence then changes low level in waveform 1, waveform 1 is again through the effect of d type flip flop, obtain eliminating in waveform 2 the corresponding part exceeding peak reference positive voltage+Vref in waveform, carry out and computing finally by by waveform 2 and waveform PWMAH, obtain waveform PWM_AH.
Concrete, the positive PWM drive singal of A phase of the utility model power cell shown in composition graphs 6 and Fig. 7 difference and the oscillogram of negative PWM drive singal; The utility model is by the effect of peak limiter circuit, when line voltage transient wave, PWM drive singal is limited according to the electric current that power cell exports in real time, the PWM drive singal exceeding hardware constraints point will directly be blocked, and active electric power filter to output current is controlled within normal scope always.
According to above-mentioned content; the utility model can arrange three groups of peak limiter circuits; come to carry out peak current restriction to alternating current ABC three-phase respectively; thus the flow problem excessively solved in active filter system balance adjustment process; protection IGBT power cell; safeguards system is not shut down, and makes subscriber equipment avoid shutting down because of Active Power Filter-APF the Harmfulness Caused by Harmonics that brings and equipment disturbs, and reduces user's loss.
By reference to the accompanying drawings embodiment of the present utility model is described in detail above, but the utility model is not restricted to above-mentioned execution mode, in the spirit and scope situation of claim not departing from the application, those skilled in the art can make various amendment or remodeling.
Claims (4)
1. an Active Power Filter-APF, is connected on the transmission line of electrical network and nonlinear load, for the harmonic current in compensation network, it is characterized in that, comprise power cell, current transformer, Hall element, controller and peak limiter circuit; Wherein,
Described current transformer is arranged on the circuit that electrical network is connected with nonlinear load, for gathering the electric current of described nonlinear load;
Described Hall element is arranged on the circuit of described power cell output, for detecting the output current of described power cell, and produces corresponding feedback current according to the output current of described power cell; The output current of wherein said power cell is used for the harmonic current in compensation network;
Described controller is connected with described current transformer and described Hall element respectively, for the electric current according to described nonlinear load, calculate the harmonic current needing to compensate, after given peak-limitation is carried out to the harmonic current of described needs compensation, again according to the feedback current of described Hall element, closed-loop adjustment is carried out to it, finally according to the described harmonic current needing to compensate, produces corresponding PWM drive singal;
Described controller is by described peak limiter circuit, described PWM drive singal is transferred to described power cell, corresponding output current is produced for driving described power cell, and described peak limiter circuit is according to the feedback current of described Hall element, the pulse duration of the described PWM drive singal of restriction process, damages because of overcurrent for preventing described power cell.
2. Active Power Filter-APF as claimed in claim 1, is characterized in that, described peak limiter circuit comprises forward peak-limitation branch road and negative peak restriction branch road, and described PWM drive singal comprises forward PWM drive singal and negative sense PWM drive singal; And, described forward PWM drive singal is after described forward peak-limitation branch road, drive the forward IGBT power tube of described power cell, described negative sense PWM drive singal, after described negative peak restriction branch road, drives the negative sense IGBT power tube of described power cell.
3. Active Power Filter-APF as claimed in claim 2, is characterized in that, described forward peak-limitation branch road and described negative peak restriction branch road are by comparator, d type flip flop and form with door; Wherein,
In described forward peak-limitation branch road, the normal phase input end access peak-limitation of described comparator is with reference to positive voltage+Vref, and its inverting input accesses the feedback current of described Hall element, and its output is connected to the RESET input of described d type flip flop; The input end of clock of described d type flip flop accesses described forward PWM drive singal, its data input pin and the common stable connection voltage source Vcc of set input, and its data output end is connected with door input with described; Describedly access described forward PWM drive singal with another input of door, its output is connected with the drive end of described forward IGBT power tube;
In described negative peak restriction branch road, the normal phase input end of described comparator accesses the feedback current of described Hall element, and its inverting input access peak-limitation is with reference to negative voltage-Vref, and its output is connected to the RESET input of described d type flip flop; The input end of clock of described d type flip flop accesses described negative sense PWM drive singal, its data input pin and the common stable connection voltage source Vcc of set input, and its data output end is connected with door input with described; Describedly access described negative sense PWM drive singal with another input of door, its output is connected with the drive end of described negative sense IGBT power tube.
4. Active Power Filter-APF as claimed in claim 1, is characterized in that, the circuit that described power cell exports also is provided with filter unit, for carrying out filtering to the output current of described power cell;
Described power cell also comprises bus capacitor, and the current harmonics for reducing switching frequency enters described electrical network.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520907211.3U CN205123258U (en) | 2015-11-13 | 2015-11-13 | Active electric power filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520907211.3U CN205123258U (en) | 2015-11-13 | 2015-11-13 | Active electric power filter |
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| Publication Number | Publication Date |
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| CN205123258U true CN205123258U (en) | 2016-03-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520907211.3U Withdrawn - After Issue CN205123258U (en) | 2015-11-13 | 2015-11-13 | Active electric power filter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105226658A (en) * | 2015-11-13 | 2016-01-06 | 四川英杰电气股份有限公司 | A kind of Active Power Filter-APF and peak current method for limiting thereof |
| CN106253280A (en) * | 2016-08-30 | 2016-12-21 | 江苏华强电力设备有限公司 | A kind of modularity low-voltage active harmonic treatment system of electrical network in parallel |
-
2015
- 2015-11-13 CN CN201520907211.3U patent/CN205123258U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105226658A (en) * | 2015-11-13 | 2016-01-06 | 四川英杰电气股份有限公司 | A kind of Active Power Filter-APF and peak current method for limiting thereof |
| CN105226658B (en) * | 2015-11-13 | 2017-06-27 | 四川英杰电气股份有限公司 | A kind of Active Power Filter-APF and its peak point current method for limiting |
| CN106253280A (en) * | 2016-08-30 | 2016-12-21 | 江苏华强电力设备有限公司 | A kind of modularity low-voltage active harmonic treatment system of electrical network in parallel |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20160330 Effective date of abandoning: 20170627 |
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| AV01 | Patent right actively abandoned |