CN107623339A - A kind of control device of converter - Google Patents
A kind of control device of converter Download PDFInfo
- Publication number
- CN107623339A CN107623339A CN201710938174.6A CN201710938174A CN107623339A CN 107623339 A CN107623339 A CN 107623339A CN 201710938174 A CN201710938174 A CN 201710938174A CN 107623339 A CN107623339 A CN 107623339A
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- current transformer
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- converter
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- 239000003990 capacitor Substances 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims description 12
- 230000002457 bidirectional effect Effects 0.000 claims description 7
- 238000001514 detection method Methods 0.000 claims description 7
- 230000005611 electricity Effects 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 239000004065 semiconductor Substances 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 230000006855 networking Effects 0.000 abstract description 7
- 230000003321 amplification Effects 0.000 abstract description 2
- 238000003199 nucleic acid amplification method Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 238000004088 simulation Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
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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
Abstract
The invention discloses a kind of control device of converter, due to the uncertainty of grid conditions, the problems such as grid-connected converter may cause the amplification of current transformer networking current harmonics, power swing, unstable current transformer when accessing different grid conditions due to impedance mismatch (light current net), jeopardize current transformer safety, shorten the current transformer life-span, it is necessary to ensure matching to reduce influencing each other for current transformer and power network for output impedance of the current transformer under different grid conditions and electric network impedance.The present invention uses the strategy in grid-connected filter capacitor branch road one group of active power converting means of series connection of current transformer, by combining common port (PCC ends) line voltage unit feedforward control and the active device, so as to eliminate electric network impedance and side harmonics component, realize to the full decoupled of power network.
Description
Technical field
The invention belongs to current transformer control technology field in AC and DC power network, and in particular to one kind is suitable for being based on
The power network uneoupled control device and method of the new energy distributed grid-connected current transformer of LCL type wave filter output.
Background technology
With the increase of global energy crisis and environmental pressure, new energy distributed generation technology gets most of the attention.New energy
Regenerative resource is generally converted to AC or DC by multiple grid-connected power converters and is connected to the grid by distributed generation system.When
When the internal resistance of power network is zero or is almost nil, the electric current for injecting power network hardly impacts to line voltage, this power network
Commonly referred to as forceful electric power net；When the internal resistance of power network be can not ignore, line voltage can be with the change of the current value of injection power network
Change and change, when the output impedance of grid-connected converter mismatches with power network internal resistance or even entail dangers to is to the safety of system, this electricity
Net can be referred to as relative light current net.Due to the non-intellectual of grid conditions, the controller of current transformer is required to compatible different
The output impedance of power network operating mode, i.e. current transformer needs to match different electric network impedances, and this brings to the controller design of current transformer
Difficulty, it is based especially on the controller design of the current transformer of LCL type wave filter output.When being connected in parallel on the grid-connected of power network common port
During current transformer quantity increase, this difficulty increases therewith, and the safe and stable operation of power network is even threatened when serious.At present mostly
Several research still focuses on proposes corresponding controlling party by establishing the mathematical modeling of specific distributed grid-connected electricity generation system
Method and injection using harmonic wave etc. are predicted to electric network impedance, for the full decoupled of physics realization grid-connected converter and power network
Method also lacks report.
The content of the invention
It is suitable for the new energy point based on the output of LCL type wave filter in view of the deficiencies of the prior art, the present invention provides a kind of
The power network uneoupled control device of cloth grid-connected converter, by combining common port line voltage unit feedforward control and being series at simultaneously
The active power converting means of net filter capacitor branch road is come effective suppression for eliminating electric network impedance He realizing networking current harmonics.
The above-mentioned technical problem of the present invention is mainly what is be addressed by following technical proposals：
The present invention is a kind of control device of converter, including common port line voltage unit feedforward control unit and is series at
The active power converting means of the grid-connected filter capacitor branch road of current transformer；
The output of the output end, current transformer current control unit of described common port line voltage unit feedforward control unit
End is connected with the signal input part of pulse width modulator；The output signal and unsteady flow of common port line voltage unit feedforward control unit
The output signal of device current control unit is superimposed, and superposed signal is converted to driving current transformer semiconductor via pulse width modulator and opened
Close the pwm signal of pipe；
The DC terminal and direct current of the described active power converting means for being series at the grid-connected filter capacitor branch road of current transformer
Potential source or storage capacitor are connected, and the exchange end of the device is series at the grid-connected filter capacitor branch road of current transformer；
Described common port line voltage unit feedforward control and active power converting means need to act on current transformer simultaneously
Output, so as to realize to the full decoupled of power network.
Preferably, described active power converting means is a kind of bidirectional power converter.
Preferably, described active power converting means is a kind of power amplifier.
The control method of described bidirectional power converter, specifically comprises the following steps：
Step 1. detection common port line voltage vpcc, the angular frequency of line voltage is obtained by phaselocked loop (PLL)0With
Phase；
Step 2. sets the centre frequency of digital trap as the angular frequency of line voltage0, with a width of ωb, vpccThrough number
Word trapper is filtered, and rejects vpccIn power frequency composition, obtain vpcc,h；
Step 3.vpcc,hThe PWM that the semiconductor switch pipe of driving bidirectional power converter is converted to via pulse width modulator believes
Number, the ac output voltage v of involuntary conversion devicePNReal-time tracking vpcc,h。
The control method of described power amplifier, it is characterised in that this method comprises the following steps：
Step 1. detection common port line voltage vpcc, the angular frequency of line voltage is obtained by phaselocked loop (PLL)0With
Phase；
Step 2. sets the centre frequency of digital trap as the angular frequency of line voltage0, with a width of ωb, vpccThrough number
Word trapper is filtered, and rejects vpccIn power frequency composition, obtain vpcc,h；
Step 3.vpcc,hIt will act as in the input of driving power amplifier, so as to force the corresponding output of power amplifier
Signal vPNReal-time tracking vpcc,h。
Beneficial effect：Control method proposed by the present invention and device by combine line voltage unit feed forward control method and
The active power converting means of grid-connected filter capacitor branch road is series at, electric network impedance is eliminated and realizes networking current harmonics
Effectively suppress, and then strengthen the stability of grid-connected converter system and improve the quality of networking electric current.
Brief description of the drawings
Fig. 1 is the grid-connected converter equivalent structure figure comprising power network uneoupled control and device.Wherein Z1Represent inverter side
Filter reactance, Z2Represent net side filter reactance, ZCRepresent filter capacitor, ZgRepresent variable equivalent electric network impedance；vpccIt is common port
(PCC) line voltage, igRepresent current transformer networking electric current, vpcc,hIt is the high-frequency harmonic voltage for filtering out power frequency part, vPNIt is injection
The voltage of filter capacitor branch road.
Fig. 2 is the current transformer control structure block diagram for including power network decoupling unit.Wherein Δ IrefIt is reference current value, Δ I1
It is inverter side inductive current, GC(s) be current transformer current controller, Gd(s) delay unit of digitial controller is then represented.
Fig. 3 is the equivalent structure and control principle drawing of bidirectional power converter.Wherein ω0Line voltage angular frequency is represented,
Sin θ is the sinusoidal signal with phase, C with line voltagedcRepresent DC bus capacitor, vdc,refIt is DC capacitor voltage vdcGinseng
Examine value, vdIt is DC voltage controller PI output signal, vacIt is then the above two product.
Fig. 4 is the equivalent structure block diagram using power amplifier.Wherein ± VCCRepresent the supply voltage of amplifier.
Current transformer output simulation result figure when Fig. 5 is no power network uneoupled control and device.Wherein vCRepresent current transformer filter
The voltage at ripple electric capacity both ends.
Current transformer output simulation result figure when Fig. 6 is only with common port line voltage unit feedforward control.
Fig. 7 is when using common port line voltage unit feedforward control and foregoing active bi-directional power transducer device simultaneously
Current transformer output simulation result figure.
Fig. 8 is simultaneously using when common port line voltage unit feedforward control and the active device based on power amplifier
Current transformer exports simulation result figure.
Embodiment
Fig. 1 is the schematic diagram of the grid-connected converter comprising power network uneoupled control unit and device, and it is by current transformer and power network
Decoupling unit forms, and power network decoupling unit includes common port line voltage unit feedforward control and is series at filter capacitor branch road
Equivalent voltage source vPN.Its corresponding control block diagram is as shown in Fig. 2 wherein dotted portion is that power network decouples part.Fig. 2 controls side note
The common port mains voltage signal entered represents unit feedforward control, and the mains voltage signal of power side injection then passes through active power
Converting means is realized.Such as：
Fig. 3 is shown using active bi-directional power inverter to realize equivalent voltage source vPN。vPNInclude power frequency component vacWith
Harmonic signal vpcc,h, wherein vacIt is to be used to ensure DC capacitor voltage vdcStabilization, vpcc,hThen it is used to eliminate electric network impedance harmony
The influence that ripple exports to current transformer.First with voltage sensor detection DC bus-bar voltage vdc, vdcWith reference voltage vdc,ref
The error signal obtained after subtracting each other exports v by PI controllersd, vdV is formd after being multiplied with sinusoidal reference signal sin θac；Its
It is secondary to utilize voltage sensor detection common port line voltage vpcc, vpccThe angular frequency exported by phaselocked loop0Fallen into as numeral
The centre frequency of ripple device, while vpccBy forming v after digital trappcc,h；Finally by vacAnd vpcc,hSuperposition, the signal of formation
Input signal as pulse width modulator.Input signal is converted to pwm signal driving switch pipe S by pulse width modulator1~S4It is dynamic
Make, and involuntary conversion device output voltage vPNTrack vac+vpcc,h。
Fig. 4 is shown using power amplifier to realize equivalent voltage source vPN.In figure left side operational amplifier be voltage with
With device, right side needs to connect the progress power amplification of AB power-like amplifiers.Supply voltage ± the V of operational amplifierCCThere is provided by outside.Should
Method utilizes voltage sensor detection common port line voltage vpcc, vpccThe angular frequency exported by phaselocked loop0As numeral
The centre frequency of trapper, while vpccBy forming v after digital trappcc,h；vpcc,hAct on the input of voltage follower
Force the output voltage v of amplifier in endPNTrack vpcc,h。
Fig. 5~Fig. 8 is the grid-connected converter output waveform that different control strategies are used under weak grid conditions.As seen from the figure,
When not using power network decoupling unit, output current of converter harmonic wave is had a great influence by power network background harmonicses.Only with
During common port line voltage unit feedforward control, due to the effect of electric network impedance and digital delay, the stability of system by compared with
Big to influence, networking current harmonics is exaggerated.It is full decoupled when being carried out using scheme described herein to power network from Fig. 7 and Fig. 8
Afterwards, networking current harmonics is suppressed well, and because the counteracting of electric network impedance, the stability of system are maintained.
The present invention eliminates electric network impedance and the power network back of the body by the active device of control and the addition of current transformer as can be seen here
Influence of the scape harmonic wave to current transformer, vice versa.Under its development that new energy distributed grid-connected generates electricity, carried according to the present invention
The measure of the elimination electric network impedance of confession, realizes the purpose mutually decoupled between current transformer and power network.It is pointed out that herein
The scheme carried is applicable AC network and direct current network.
Claims (5)
- A kind of 1. control device of converter, it is characterised in that：Including common port line voltage unit feedforward control unit and series connection In the active power converting means of the grid-connected filter capacitor branch road of current transformer；The output end of described common port line voltage unit feedforward control unit, the output end of current transformer current control unit with The signal input part connection of pulse width modulator；The output signal of common port line voltage unit feedforward control unit and current transformer electricity The output signal of flow control unit is superimposed, and superposed signal is converted to driving current transformer semiconductor switch pipe via pulse width modulator Pwm signal；The DC terminal and direct voltage source of the described active power converting means for being series at the grid-connected filter capacitor branch road of current transformer Or storage capacitor is connected, the exchange end of the device is series at the grid-connected filter capacitor branch road of current transformer；Described common port line voltage unit feedforward control and active power converting means need to act on the defeated of current transformer simultaneously Go out, so as to realize to the full decoupled of power network.
- A kind of 2. control device of converter according to claim 1, it is characterised in that：Described active power converting means For a kind of bidirectional power converter.
- A kind of 3. control device of converter according to claim 1, it is characterised in that：Described active power converting means For a kind of power amplifier.
- A kind of 4. control device of converter according to claim 2, it is characterised in that：Described bidirectional power converter Control method, specifically comprise the following steps：Step 1. detection common port line voltage vpcc, the angular frequency of line voltage is obtained by phaselocked loop0And phase；Step 2. sets the centre frequency of digital trap as the angular frequency of line voltage0, with a width of ωb, vpccFallen into through numeral Ripple device is filtered, and rejects vpccIn power frequency composition, obtain vpcc,h；Step 3.vpcc,hThe pwm signal of the semiconductor switch pipe of driving bidirectional power converter is converted to via pulse width modulator, The ac output voltage v of involuntary conversion devicePNReal-time tracking vpcc,h。
- A kind of 5. control device of converter according to claim 3, it is characterised in that：The control of described power amplifier Method, it is characterised in that this method comprises the following steps：Step 1. detection common port line voltage vpcc, the angular frequency of line voltage is obtained by phaselocked loop0And phase；Step 2. sets the centre frequency of digital trap as the angular frequency of line voltage0, with a width of ωb, vpccFallen into through numeral Ripple device is filtered, and rejects vpccIn power frequency composition, obtain vpcc,h；Step 3.vpcc,hIt will act as in the input of driving power amplifier, so as to force the corresponding output signal of power amplifier vPNReal-time tracking vpcc,h。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710938174.6A CN107623339B (en) | 2017-09-30 | 2017-09-30 | Converter control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710938174.6A CN107623339B (en) | 2017-09-30 | 2017-09-30 | Converter control device |
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| Publication Number | Publication Date |
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| CN107623339A true CN107623339A (en) | 2018-01-23 |
| CN107623339B CN107623339B (en) | 2020-05-19 |
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| CN201710938174.6A Active CN107623339B (en) | 2017-09-30 | 2017-09-30 | Converter control device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108667070A (en) * | 2018-04-28 | 2018-10-16 | 杭州电子科技大学 | A kind of three-phase grid-connected converter control device |
| CN108767893A (en) * | 2018-04-28 | 2018-11-06 | 杭州电子科技大学 | It is suitable for the active and slave current control device of new energy distributed grid-connected current transformer |
| CN111682578A (en) * | 2020-05-09 | 2020-09-18 | 杭州电子科技大学 | Three-phase harmonic resonance suppression device and suppression method |
| CN113489049A (en) * | 2021-06-07 | 2021-10-08 | 国网浙江省电力有限公司嘉兴供电公司 | Grid-connected inverter grid-side current control method |
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| US20060033479A1 (en) * | 2004-08-11 | 2006-02-16 | Uis Abler Electronics Co., Ltd. | Three-phase three-wire active power filter |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108667070A (en) * | 2018-04-28 | 2018-10-16 | 杭州电子科技大学 | A kind of three-phase grid-connected converter control device |
| CN108767893A (en) * | 2018-04-28 | 2018-11-06 | 杭州电子科技大学 | It is suitable for the active and slave current control device of new energy distributed grid-connected current transformer |
| CN108667070B (en) * | 2018-04-28 | 2021-02-19 | 杭州电子科技大学 | Three-phase grid-connected converter control device |
| CN111682578A (en) * | 2020-05-09 | 2020-09-18 | 杭州电子科技大学 | Three-phase harmonic resonance suppression device and suppression method |
| CN111682578B (en) * | 2020-05-09 | 2022-02-18 | 杭州电子科技大学 | Three-phase harmonic resonance suppression device and suppression method |
| CN113489049A (en) * | 2021-06-07 | 2021-10-08 | 国网浙江省电力有限公司嘉兴供电公司 | Grid-connected inverter grid-side current control method |
| CN113489049B (en) * | 2021-06-07 | 2024-05-03 | 国网浙江省电力有限公司嘉兴供电公司 | Grid-side current control method of grid-connected inverter |
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| CN107623339B (en) | 2020-05-19 |
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