CN106786583A - Uninterruptible power system and its harmonic wave of output voltage suppression circuit - Google Patents
Uninterruptible power system and its harmonic wave of output voltage suppression circuit Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
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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 present invention relates to a kind of harmonic wave of output voltage suppression circuit, including：Harmonic component extraction circuit, for the harmonic voltage component signal in extract real-time output voltage；Gain control circuit, for determining real-time gain amplification coefficient according to default total harmonic distortion rate, harmonic voltage component signal and fundamental voltage output of voltage component virtual value；Gain amplifying circuit, for carrying out gain amplification disposal to harmonic voltage component signal using gain amplification coefficient；And signaling conversion circuit, the harmonic voltage component signal for gain amplifying circuit to be exported is converted to harmonic compensation command signal and exports to the control circuit of uninterruptible power system.Quickly the harmonic component of output voltage can be suppressed in default total harmonic distortion rate by harmonic wave of output voltage suppression circuit, meet uninterruptible power system to loading the demand that the quality of power supply high is powered.The invention further relates to a kind of uninterruptible power system.
Description
Technical field
The present invention relates to power technique fields, more particularly to a kind of uninterruptible power system and its harmonic wave of output voltage press down
Circuit processed.
Background technology
With the rapid growth of data center power sources load in recent years, energy efficiency indexes requirement more and more higher, therefore between not
The requirement also more and more higher of the quality of power supply of power-off origin system output.Traditional uninterruptible power system is loaded in data center
During power supply, the harmonic component of its output voltage is larger, so as to cause its output quality of power supply to meet high-quality power demands.
The content of the invention
Based on this, it is necessary to provide it is a kind of can to load carry out uninterruptible power system that the quality of power supply high powers and its
Harmonic wave of output voltage suppression circuit.
A kind of harmonic wave of output voltage suppression circuit, for the voltage harmonic component in uninterruptible power system output voltage
Suppressed；Including：Harmonic component extraction circuit, for the harmonic voltage component signal in output voltage described in extract real-time；
Gain control circuit, is connected with the harmonic component extraction circuit, for according to default total harmonic distortion rate, the harmonic voltage
The fundametal compoment virtual value of component signal and the output voltage determines real-time gain amplification coefficient；Gain amplifying circuit, point
It is not connected with the harmonic component extraction circuit and the gain control circuit；The gain amplifying circuit is put using the gain
Big coefficient carries out gain amplification disposal to the harmonic voltage component signal；And signaling conversion circuit, amplify with the gain
Circuit is connected, defeated for the harmonic voltage component signal that the gain amplifying circuit is exported to be converted into harmonic compensation command signal
Go out to the control circuit of the uninterruptible power system.
Above-mentioned harmonic wave of output voltage suppression circuit, gain control circuit can be according to harmonic voltage component signal, default total humorous
The fundametal compoment virtual value of wave distortion degree and output voltage determines real-time gain amplification coefficient.Gain amplifying circuit utilizes the increasing
Beneficial amplification coefficient to harmonic component extraction circuit extraction to harmonic voltage component signal carry out gain amplification disposal, and by letter
The effect of number change-over circuit is exported to the control circuit of uninterruptible power system after being converted to harmonic compensation command signal.Control electricity
Road can carry out reality according to the harmonic voltage component in the output voltage of the harmonic compensation command signal to uninterruptible power system
When compensate so that the quick harmonic voltage component by output voltage suppresses in default total harmonic distortion rate, meet uninterrupted
Power-supply system is to loading the demand that the quality of power supply high is powered.
Wherein in one embodiment, the harmonic component extraction circuit includes：First three-phase static coordinate system is to two-phase
Rotating coordinate system modular converter, for the three-phase output voltage that the uninterruptible power system is exported to be converted into q shaft voltages and d
Shaft voltage；And high-pass filter, the output with first three-phase static coordinate system to two-phase rotating coordinate system modular converter
End connection, for filtering the DC component in the q shaft voltages and the d shaft voltages to obtain q axle harmonic voltages component letter
Number and d axle harmonic voltage component signals.
Wherein in one embodiment, the gain amplifying circuit is used for according to the gain amplification coefficient to the q axles
Harmonic voltage component signal and d axle harmonic voltage component signals carry out gain amplification disposal；The signaling conversion circuit include according to
First two-phase rotating coordinate system of secondary connection is to three-phase static coordinate system modular converter and the second three-phase static coordinate system to two-phase
Rotating coordinate system modular converter；First two-phase rotating coordinate system is put to three-phase static coordinate system modular converter with the gain
Big circuit connection, for d axle harmonic voltage component signals and q axle harmonic voltages the component letter for exporting the gain amplifying circuit
Number be converted to three phase harmonic compensating instruction signal；Second three-phase static coordinate system is used to two-phase rotating coordinate system modular converter
It is defeated after the three phase harmonic compensating instruction signal to be converted to d harmonic compensations command signal and q axle harmonic compensation command signals
Go out to the control circuit of the uninterruptible power system.
Wherein in one embodiment, the gain control circuit includes：First computing unit, first computing unit
Input be connected with the output end of the harmonic component extraction circuit；First computing unit is used for according to harmonic wave electricity
Pressure component signal asks for the quadratic sum of target order harmonic components as value of feedback；Second computing unit, second computing unit
First input end be used for receive the default total harmonic distortion rate；Second input of second computing unit and the change
The output end connection of device is flowed, to obtain the fundametal compoment virtual value of the current transformer output voltage；Second computing unit is used
Lost in the fundametal compoment virtual value for extracting the output voltage and according to the fundametal compoment virtual value and default total harmonic wave
True degree asks for the quadratic sum of reference voltage harmonic component as reference value；Adder, respectively with first computing unit and institute
State the second computing unit connection, for the value of feedback and the reference value to be made the difference after form error signal；And increase
Beneficial controller, is connected with the adder and the gain amplifying circuit respectively；The gain controller is used for the error
Signal carries out closed-loop control and generates the gain amplification coefficient.
Wherein in one embodiment, second computing unit is according to the fundametal compoment virtual value and described default total
The quadratic sum that total harmonic distortion asks for reference voltage harmonic component is as the computing formula of reference value：Wherein,It is the reference value, VgIt is the fundametal compoment virtual value, THD*For described pre-
If total harmonic distortion rate.
Wherein in one embodiment, the target order harmonic components include (6k ± 1) subharmonic, and wherein k is positive integer.
Wherein in one embodiment, the default total harmonic distortion rate is less than or equal to 5%.
Wherein in one embodiment, the gain controller is PI controllers.
Wherein in one embodiment, the gain amplifying circuit includes multiplier；Two inputs of the multiplier
It is connected with the harmonic component extraction circuit, the gain control circuit respectively；The output end of the multiplier and the signal
Change-over circuit is connected.
A kind of uninterruptible power system, including current transformer and control circuit；The control circuit is connected with the current transformer,
It is controlled for the work to the current transformer, it is characterised in that also including the output electricity as described in foregoing any embodiment
Pressure harmonic suppression circuit；The harmonic component extraction circuit is connected with the output end of the current transformer；The signaling conversion circuit
Output end with it is described control circuit be connected.
Brief description of the drawings
Fig. 1 is the structured flowchart of the harmonic wave of output voltage suppression circuit in an embodiment；
Fig. 2 is the schematic block circuit diagram of the harmonic wave of output voltage suppression circuit in an embodiment；
Fig. 3 is the schematic block circuit diagram of the uninterruptible power system in an embodiment；
Fig. 4 is that A phases when uninterruptible power system does not carry out harmonic compensation export quality of power supply effect diagram；
Fig. 5 is A of the uninterruptible power system after harmonic wave of output voltage suppression circuit carries out harmonic wave of output voltage suppression
Phase quality of power supply schematic diagram.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
It should be noted that when an element is considered as " connection " another element, it can be directly to another
Individual element may be simultaneously present centering elements.Conversely, when element is connected referred to as " direct " with another element, not existing
Intermediary element.
Referring to Fig. 1, the harmonic wave of output voltage suppression circuit is used for humorous to the voltage in uninterruptible power system output voltage
Wave component is suppressed, to cause the uninterruptible power system harmonic wave of output voltage value control after harmonics restraint in the scope of regulation
It is interior, so as to realize powering the quality of power supply high for loading.
The harmonic wave of output voltage suppression circuit includes that harmonic component extraction circuit 110, gain control circuit 120, gain are put
Big circuit 130 and signaling conversion circuit 140.Wherein, the input of harmonic component extraction circuit 110 connects with the output end of current transformer
Connect.The input of gain control circuit 120 respectively with harmonic component extraction circuit 110 and the output end of uninterruptible power system
Connection.In the present embodiment, the output end of the current transformer in uninterruptible power system as uninterruptible power system output end,
As shown in Figure 1.The input of gain amplifying circuit 130 connects with harmonic component extraction circuit 110 and gain control circuit 120 respectively
Connect.The output end of gain amplifying circuit 130 is connected with signaling conversion circuit 140.
The harmonic voltage component signal that harmonic component extraction circuit 110 is used in extract real-time current transformer output voltage.Increase
Benefit control circuit 120 is used for harmonic voltage component signal, the default total harmonic wave mistake extracted according to harmonic component extraction circuit 110
True degree and fundamental voltage output of voltage component virtual value determine real-time gain amplification coefficient and export to gain amplifying circuit 130.Increase
Beneficial amplifying circuit 130 is entered using the gain amplification coefficient to the harmonic voltage component signal that harmonic component extraction circuit 110 is exported
Row gain is exported to signaling conversion circuit 140 after amplifying.Signaling conversion circuit 140 divides the harmonic voltage after gain is amplified
Amount signal is exported to the control circuit of uninterruptible power system after being converted to harmonic compensation command signal, to cause that control circuit can
Harmonic compensation is carried out to the output voltage of current transformer with according to the harmonic compensation command signal, and then harmonic wave of output voltage is suppressed
In default total harmonic distortion rate.
Above-mentioned harmonic wave of output voltage suppression circuit, gain control circuit 120 is understood according to harmonic voltage component signal, is preset always
Total harmonic distortion and fundamental voltage output of voltage component virtual value determine real-time gain amplification coefficient.Gain amplifying circuit 130 is utilized
The gain amplification coefficient carries out gain amplification disposal to the harmonic voltage component signal that harmonic component extraction circuit 110 is extracted,
And exported to the control of uninterruptible power system after the effect of signaling conversion circuit 140 is converted to harmonic compensation command signal
Circuit.Control circuit can carry out reality according to the harmonic compensation command signal to the harmonic voltage component in current transformer output voltage
When compensate so that quick suppress in default total harmonic distortion rate harmonic wave of output voltage component, meet uninterruptible power system
To loading the demand that the quality of power supply high is powered.Above-mentioned harmonic wave of output voltage suppression circuit can be according to the change reality of harmonic wave of output voltage
Shi Shengcheng gain amplification coefficients, so that harmonics restraint real-time is very good, and with preferable harmonic suppression effect.
Fig. 2 is the schematic block circuit diagram of the harmonic wave of output voltage suppression circuit in an embodiment.In the present embodiment, harmonic wave
Component extraction circuit includes the first three-phase static coordinate system to a two-phase rotating coordinate system modular converter (abc/dq moduluss of conversion
Block) 212 and high-pass filter 214.The input of the first abc/dq modular converters 212 is connected with the output end of current transformer, is used for
Receive the three-phase voltage (u of current transformer outputgA、ugB、ugC).The output end and high-pass filter of the first abc/dq modular converters 212
214 input connection.Wherein, an abc/dq modular converters 212 are used for the three-phase voltage (u for exporting current transformergA、ugB、
ugC) be converted to q shaft voltages UgqWith d shaft voltages Ugd.High-pass filter 214 is used for q shaft voltages UgqWith d shaft voltages UgdIn straight
Flow is filtered out, q axle harmonic voltage component signal U of the generation comprising all voltage harmonic componentsgqhWith d axle harmonic voltage components
Signal Ugdh(three-phase voltage can be analyzed to fundamental voltage harmony wave voltage two parts).
Gain control circuit includes the first computing unit 222, the second computing unit 224, adder 226 and gain controller
228.Specifically, the output end of the high-pass filter 214 in the input of the first computing unit 222 and harmonic component extraction circuit
Connection.The output end of the first computing unit 222 is connected with an input of adder 226.First computing unit 222 is used for root
According to the q axle harmonic voltage component signals U that high-pass filter 214 is exportedgqhWith d axle harmonic voltage component signals UgdhAsk for target time
The quadratic sum of harmonic component is used as value of feedback Vh 2.In one embodiment, target order harmonic components can be including all of harmonic wave point
Amount, namely Vh 2For：
Vh 2=Ugdh 2+Ugqh 2 (1)。
In another embodiment, target order harmonic components can also be only (6k ± 1) subharmonic, and wherein k is positive integer,
Namely including 5 subharmonic, 7 subharmonic, 11 subharmonic ..., now Vh 2For：
Vh 2=V5 2+V7 2+V11 2+V13 2+…。
One input of the second computing unit 224 is used to receive default total harmonic distortion rate THD*, another input
It is connected with the output end of current transformer.The output end of the second computing unit 224 is connected with another input of adder 226.In advance
If total harmonic distortion rate THD*It is the expection value to be reached.The value can be carried out really according to applied code or power supply quality demand
It is fixed.In the present embodiment, preset total harmonic distortion rate THD* and be less than or equal to 5%.Second computing unit 224 is used to obtain output electricity
Pressure fundametal compoment virtual value Vg, and according to fundametal compoment virtual value VgReference voltage is asked for default total harmonic distortion rate THD*
The quadratic sum of harmonic component is used as reference valueSecond computing unit 224 calculates reference valueFormula it is as follows：
Formula (2) to ask for process as follows：
The three-phase output voltage u of uninterruptible power system (UPS)gA、ugB、ugCExpression formula is：
Wherein, VgIt is fundametal compoment virtual value, VhIt is voltage harmonic component virtual value, ωgIt is fundamental wave angular frequency, ωhFor humorous
Wave component angular frequency, hIt refer to the phase of correspondence subharmonic.
Abc three-phase static coordinate systems are as follows to dq two-phase rotating coordinate system transformation matrixs：
Therefore, three-phase output voltage ugA、ugB、ugCGeneration includes all voltage harmonic components after abc/dq is converted
Amount UgdAnd UgqExpression formula be：
By high pass filter block by UgdAnd UgqIn DC component filter, generation include all voltage harmonic components
Signal UgdhAnd Ugqh, and according to UgdhAnd UgqhCalculate the quadratic sum V of all harmonic voltage componentsh 2Expression formula is：
It should be noted that due to maximum with 5 subharmonic and 7 subharmonic values in each harmonic component in output voltage,
Therefore in above-mentioned formula derivation, the only effect of 5 subharmonic of consideration and 7 subharmonic, therefore Vh 2Expression formula in only containing 5 times it is humorous
All information of wave component and 7 order harmonic components.Further, in above-mentioned, due to high frequency AC compounent 2V5V7cos(ω12t
+φ5+φ7) very little, therefore ignored, so that Vh 2Expression formula be equivalent to：
The definition of total harmonic distortion rate THD is：
Therefore, formula (3) is brought into above formula, is then had：
Therefore, according to default total harmonic distortion rate THD*With the fundametal compoment virtual value V of output voltagegGinseng can be asked for
Examine value
The output end of adder 226 is connected with the input of gain controller 228.Adder 226 is used to be calculated first
The value of feedback V of the input of unit 222h 2The reference value being input into the second computing unit 224Formation error signal more afterwards is made the difference to send
Enter to gain controller 228.228 pairs of error signals of gain controller carry out closed loop regulation control, and generate gain amplification
COEFFICIENT KV.Gain controller 228 can use voltage ring controller, such as PI controllers.The gain of the output of gain controller 228 is put
Big COEFFICIENT KVIt is the number more than or equal to zero.Specifically, gain controller 228 is larger in the error signal of input, namely feedback
Value Vh 2And reference valueDifference it is larger when, the gain amplification coefficient K of outputVBecome big, so that the harmonic wave for finally giving is mended
Component increase is repaid, the harmonic component in virtual voltage is offset, by the total harmonic distortion rate THD of uninterruptible power system output voltage
It is suppressed to target zone.Gain controller 228 then reduces gain amplification coefficient K when error signal reducesV。
In the present embodiment, gain amplifying circuit is multiplier 230.Multiplier 230 is used for gain amplification coefficient KVWith q
Axle harmonic voltage component signal Ugqh, d axle harmonic voltage component signals UgdhIt is multiplied respectively, so as to produce comprising all voltages
The signal i of harmonic componentcdhAnd icqh, namely
icdh=KV×Ugdh。
icqh=KV×Ugqh。
Signaling conversion circuit includes the first two-phase rotating coordinate system for being sequentially connected to three-phase static coordinate system modular converter
(a dq/abc modular converters) 242 and second three-phase static coordinate system is to two-phase rotating coordinate system modular converter (the 2nd abc/
Dq modular converters) 244.First dq/abc modular converters 242 are connected with multiplier 230.First dq/abc modular converters 242 are used for
The d axle harmonic voltage component signals i of the output of multiplier 230cdhWith q axle harmonic voltage component signals icqhBe converted to three phase harmonic benefit
Repay command signal icvA、icvBAnd icvC.2nd abc/dq modular converters 244 are used for three phase harmonic compensating instruction signal icvA、icvB
And icvCBe converted to d harmonic compensation command signals icvdWith q axle harmonic compensation command signals icvqAfter export to uninterruptible power system
Electric current loop d axles and q axles in the off-network control unit in circuit is controlled to get on, so that uninterruptible power system final output
Voltage harmonic compensation rate can offset harmonic component in actual output voltage, realize powering the quality of power supply high for loading.
The present invention also provides a kind of uninterruptible power system, and it includes current transformer 310 and control circuit 320, also including defeated
Go out voltage harmonic suppression circuit 330, as shown in Figure 3.Wherein, the output end of current transformer 310 is by points of common connection PCC and load
Connected with power network.Control circuit 320 is connected with current transformer 310, is controlled for the work to current transformer 310.In this implementation
In example, control circuit 320 includes off-network control unit 322, cutting-in control unit 324, driver element 326 and main control unit
328.Main control unit 328 is used to switch over control to the working condition of off-network control unit 322 and cutting-in control unit 324
System.Off-network control unit 322 is used to generate off-network control signal and export to driver element 326 with to uninterruptible power system
Off-network pattern is controlled.Cutting-in control unit 324 is then used to generate cutting-in control signal and export to driver element 326 with right
Work under the grid-connect mode of uninterrupted system is controlled.Harmonic wave of output voltage suppression circuit 330 can be foregoing any reality
Apply the harmonic wave of output voltage suppression circuit in example, its input is connected with the output end of current transformer 310, output end then with off-network control
The input connection of unit processed 322.The harmonic wave that off-network control unit 322 is exported according to harmonic wave of output voltage suppression circuit 330 is mended
Repay command signal carries out harmonic compensation to the output voltage of current transformer 310, to offset the harmonic component in output voltage, so that real
Now the quality of power supply high for loading is powered.
Fig. 4 is that A phases when uninterruptible power system does not carry out harmonic compensation export quality of power supply effect diagram, A in Fig. 4
Phase output voltage frequency spectrum comprising fundamental wave, 5 times (5th), 7 times (7th), 11 times (11h), 13 times (13th), 17 times (17th), 19 times
(19th), 23 times (23th), 25 times (25th), 29 times (29th), 31 (31th) voltage harmonics etc., total harmonic wave of output voltage
THD values are more than 5%.Fig. 5 carries out harmonic wave of output voltage suppression for uninterruptible power system by harmonic wave of output voltage suppression circuit 330
A phase quality of power supply schematic diagrames after system.In Fig. 5, due to the automated closed-loop adjustment effect by harmonic wave of output voltage suppression circuit,
So that 5 times in output voltage in uninterruptible power system, 7 times, 11 times, 13 times, 17 times, 19 times, 23 times, 25 times, 29 times,
31 subharmonic are suppressed to minimum, therefore total harmonic wave of output voltage THD values are less than 5%, realize the quality of power supply high to loading and supply
Electricity.
Each technical characteristic of embodiment described above can be combined arbitrarily, to make description succinct, not to above-mentioned reality
Apply all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, the scope of this specification record is all considered to be.
Embodiment described above only expresses several embodiments of the invention, and its description is more specific and detailed, but simultaneously
Can not therefore be construed as limiting the scope of the patent.It should be pointed out that coming for one of ordinary skill in the art
Say, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention
Scope.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (10)
1. a kind of harmonic wave of output voltage suppression circuit, for entering to the voltage harmonic component in uninterruptible power system output voltage
Row suppresses；It is characterised in that it includes：
Harmonic component extraction circuit, for the harmonic voltage component signal in output voltage described in extract real-time；
Gain control circuit, is connected with the harmonic component extraction circuit, for according to default total harmonic distortion rate, the harmonic wave
The fundametal compoment virtual value of component of voltage signal and the output voltage determines real-time gain amplification coefficient；
Gain amplifying circuit, is connected with the harmonic component extraction circuit and the gain control circuit respectively；The gain is put
Big circuit is used to carry out gain amplification disposal to the harmonic voltage component signal using the gain amplification coefficient；And
Signaling conversion circuit, is connected with the gain amplifying circuit, for the harmonic voltage for exporting the gain amplifying circuit
Component signal is converted to harmonic compensation command signal and exports to the control circuit of the uninterruptible power system.
2. harmonic wave of output voltage suppression circuit according to claim 1, it is characterised in that the harmonic component extraction circuit
Including：
First three-phase static coordinate system to two-phase rotating coordinate system modular converter, for what the uninterruptible power system was exported
Three-phase output voltage is converted to q shaft voltages and d shaft voltages；And
High-pass filter, is connected with first three-phase static coordinate system to the output end of two-phase rotating coordinate system modular converter,
For the DC component in the q shaft voltages and the d shaft voltages to be filtered to obtain q axle harmonic voltage component signals and d axles
Harmonic voltage component signal.
3. harmonic wave of output voltage suppression circuit according to claim 2, it is characterised in that the gain amplifying circuit is used for
The q axles harmonic voltage component signal and d axle harmonic voltage component signals are carried out by gain and put according to the gain amplification coefficient
Big treatment；
The signaling conversion circuit includes the first two-phase rotating coordinate system for being sequentially connected to three-phase static coordinate system modular converter
With the second three-phase static coordinate system to two-phase rotating coordinate system modular converter；First two-phase rotating coordinate system is to three phase static
Coordinate system modular converter is connected with the gain amplifying circuit, for the d axle harmonic voltages for exporting the gain amplifying circuit
Component signal and q axle harmonic voltage component signals are converted to three phase harmonic compensating instruction signal；The second three phase static coordinate
Two-phase rotating coordinate system modular converter is tied to for the three phase harmonic compensating instruction signal to be converted into d harmonic compensations instruction letter
Number and q axle harmonic compensation command signals after export to the control circuit of the uninterruptible power system.
4. harmonic wave of output voltage suppression circuit according to claim 1, it is characterised in that the gain control circuit bag
Include：
First computing unit, the input of first computing unit is connected with the output end of the harmonic component extraction circuit；
First computing unit is used to ask for the quadratic sum of target order harmonic components as anti-according to the harmonic voltage component signal
Feedback value；
Second computing unit, the first input end of second computing unit is used to receive the default total harmonic distortion rate；Institute
The second input for stating the second computing unit is connected with the output end of the uninterruptible power system, to obtain the output voltage
Fundametal compoment virtual value；Second computing unit is used to extract the fundametal compoment virtual value of the output voltage and according to institute
State fundametal compoment virtual value and the default total harmonic distortion rate asks for the quadratic sum of reference voltage harmonic component as reference value；
Adder, is connected with first computing unit and second computing unit respectively, for by the value of feedback and institute
State after reference value makes the difference and form error signal；And
Gain controller, is connected with the adder and the gain amplifying circuit respectively；The gain controller is used for institute
Stating error signal carries out closed-loop control and generates the gain amplification coefficient.
5. harmonic wave of output voltage suppression circuit according to claim 4, it is characterised in that second computing unit according to
The fundametal compoment virtual value and the default total harmonic distortion rate ask for the quadratic sum of reference voltage harmonic component as reference
The computing formula of value is：
Wherein,It is the reference value, VgIt is the fundametal compoment virtual value, THD*It is the default total harmonic distortion rate.
6. harmonic wave of output voltage suppression circuit according to claim 4, it is characterised in that the target order harmonic components bag
(6k ± 1) subharmonic is included, wherein k is positive integer.
7. harmonic wave of output voltage suppression circuit according to claim 4, it is characterised in that the default total harmonic distortion rate
Less than or equal to 5%.
8. harmonic wave of output voltage suppression circuit according to claim 4, it is characterised in that the gain controller is PI controls
Device processed.
9. harmonic wave of output voltage suppression circuit according to claim 1, it is characterised in that the gain amplifying circuit includes
Multiplier；Two inputs of the multiplier are connected with the harmonic component extraction circuit, the gain control circuit respectively；
The output end of the multiplier is connected with the signaling conversion circuit.
10. a kind of uninterruptible power system, including current transformer and control circuit；The control circuit is connected with the current transformer,
It is controlled for the work to the current transformer, it is characterised in that also including the output as described in claim 1~9 is any
Voltage harmonic suppression circuit；The harmonic component extraction circuit is connected with the output end of the current transformer；The signal conversion electricity
The output end on road is connected with the control circuit.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114069631A (en) * | 2022-01-11 | 2022-02-18 | 四川大学 | Low-voltage distribution network harmonic suppression circuit |
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| CN114069631A (en) * | 2022-01-11 | 2022-02-18 | 四川大学 | Low-voltage distribution network harmonic suppression circuit |
| CN114069631B (en) * | 2022-01-11 | 2022-04-29 | 四川大学 | Low-voltage distribution network harmonic control circuit |
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| CN106786583B (en) | 2019-05-17 |
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