CN109038637A - A kind of DC voltage fluctuation suppressing method suitable for modularization multi-level converter - Google Patents
A kind of DC voltage fluctuation suppressing method suitable for modularization multi-level converter Download PDFInfo
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- CN109038637A CN109038637A CN201810884837.5A CN201810884837A CN109038637A CN 109038637 A CN109038637 A CN 109038637A CN 201810884837 A CN201810884837 A CN 201810884837A CN 109038637 A CN109038637 A CN 109038637A
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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
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
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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
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
- H02J2003/365—Reducing harmonics or oscillations in HVDC
-
- 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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a kind of DC voltage fluctuation suppressing methods suitable for modularization multi-level converter, with loop current suppression thought, by the way that additional control signals are added in MMC modulating waveu dc2f_ref, the fluctuation of DC voltage is inhibited.The wave component of DC voltage is extracted by building second order high-pass filtering function, the cutoff frequency of high-pass filtering function is taken as 2 times of power frequency；Two DC components are broken down into using phaselocked loop and single-phase Park coordinate transformU dc2fdWithU dc2fq, then respectively with reference valueU dc2fd_refWithU dc2fq_refAfter making difference, the control component under dq coordinate system is obtained by pi regulator, using obtaining single-phase additional AC controling signal after dq-a coordinate inverse transformationu dc2f_ref, wherein to realize the inhibition to wave component, takeU dc2fd_ref=U dc2fq_ref=0.In DC voltage fluctuation suppressing method proposed by the invention, DC voltage greatly reduces the calculated load of control system, and one group of PI parameter is only needed in control process as unique control variable, and control is simple direct.
Description
Technical field
The present invention relates to a kind of DC voltage fluctuation suppressing methods suitable for modularization multi-level converter, belong to electric power
System flexibility direct current transmission and distribution technical field.
Background technique
Since 2001 are suggested, modularization multi-level converter (MMC) technology is developed rapidly, so far, MMC
The first choice topology for having become voltage source converter in flexible direct current electrical power trans mission/distribution system, represents third generation direct current transmission and distribution skill
The developing direction of art.Relative to topological structures such as two level and three-level converters, MMC low, switching loss with manufacture difficulty
The small, advantages such as waveform quality is high, scalability is strong.
With the continuous development of inverter research level and manufacture level, flexible direct current transmission & distribution power technology it is resonable opinion research and
Tremendous breakthrough is all achieved in engineering practice.Correlative study is gradually from topological structure and Baseline Control Strategy to transient characterisitics
And control & protection strategy transfer.In direct current transmission and distribution occasion, when unbalanced fault occurs for AC system, net side imbalance three
Phase voltage can be expressed as the superposition of positive sequence, negative phase-sequence and zero-sequence component.Since the transformer winding connection of Y or Δ can play isolation zero
Therefore the effect of order components can not consider influence of the zero-sequence component to valve side, then fault condition lower valve side alternating voltage can be with
It is expressed as the sum of positive and negative and negative sequence component, negative sequence component therein will be transferred to DC side by inverter MMC, be presented as direct current
Two double-frequency fluctuations of side, wave component also will be transmitted to peer-to-peer system, expand fault incidence.
Summary of the invention
The technical problems to be solved by the present invention are: providing a kind of DC voltage suitable for modularization multi-level converter
Suppressing method is fluctuated, this method is able to suppress two double-frequency fluctuation of DC voltage as caused by AC system unbalanced fault, improves
The operation characteristic of flexible direct current electrical power trans mission/distribution system.
The present invention uses following technical scheme to solve above-mentioned technical problem:
A kind of DC voltage fluctuation suppressing method suitable for modularization multi-level converter, includes the following steps:
Step 1, second order high-pass filtering function G is constructedHPF(s), and the more level changes of current of the filter function extraction moduleization are utilized
Device DC voltage UdMMCWave component udc2f, after phaselocked loop and single-phase Park coordinate transform, by wave component udc2fPoint
Solution is two DC component Udc2fdAnd Udc2fq；
Step 2, the DC component U that will be decompositeddc2fdWith reference value Udc2fd_refIt is poor to make, by DC component Udc2fqWith reference
Value Udc2fq_refIt is poor to make, and two obtained differences pass through pi regulator, the control component under dq coordinate system is obtained, using dq-a
Single-phase additional AC controling signal u is obtained after coordinate inverse transformationdc2f_ref, wherein Udc2fd_ref=Udc2fq_ref=0；
Step 3, by single-phase additional AC controling signal udc2f_refIt is superimposed to and is controlled by modular multilevel converter system grade
The voltage modulated wave u that device processed obtainsabcrefIn, modulation strategy and Pressure and Control by valve level controller obtain the triggering of IGBT
Pulse, control module multilevel converter bridge arm submodule are switched on or off.
As a preferred solution of the present invention, the step 1 specific formula is as follows:
Wherein, GHPFIt (s) is second order high-pass filtering function, K is proportional gain factor, and s is complex frequency, and ξ is damping ratio, ωp
For cutoff frequency, udc2fFor DC voltage UdMMCWave component, T be the AC system period, Udc2fd、Udc2fqIndicate direct current
Component, θ are phase angle.
As a preferred solution of the present invention, the phase angle theta is by DC voltage UdMMCWave component udc2fLocking phase obtains
It arrives.
As a preferred solution of the present invention, second order high-pass filtering function G described in step 1HPF(s) cutoff frequency is
2 times of power frequency.
As a preferred solution of the present invention, the phase angle used in dq-a coordinate inverse transformation described in step 2 is by DC side
Voltage UdMMCWave component udc2fLocking phase obtains.
The invention adopts the above technical scheme compared with prior art, has following technical effect that
1, the method for the present invention uses loop current suppression thought, by the way that additional control signals u is added in MMC modulating wavedc2f_ref,
The fluctuation of DC voltage is inhibited, the two frequency multiplication wave of DC voltage as caused by AC system unbalanced fault is able to suppress
It is dynamic, improve the operation characteristic of flexible direct current electrical power trans mission/distribution system.
2, DC voltage fluctuation proposed by the invention inhibits in strategy, and DC voltage is as unique control variable, significantly
Reduce the calculated load of control system, and only need one group of PI parameter in control process, control is simple direct.
Detailed description of the invention
Fig. 1 is modular multi-level converter topological structure.
Fig. 2 is MMC entirety control block diagram under DC voltage fluctuation suppressing method of the present invention.
Fig. 3 is MMC DC voltage waveform.
Fig. 4 is two double-frequency fluctuation component peak value waveform in MMC DC voltage.
Fig. 5 is MMC exchange side grid-connected current waveform.
Specific embodiment
Embodiments of the present invention are described below in detail, the example of the embodiment is shown in the accompanying drawings.Below by
The embodiment being described with reference to the drawings is exemplary, and for explaining only the invention, and is not construed as limiting the claims.
When unbalanced fault occurs for AC system, negative sequence component will be transferred to DC side by inverter MMC, embody
For two double-frequency fluctuations of DC side, wave component also will be transmitted to peer-to-peer system, expand fault incidence.As shown in Fig. 2, being
The present invention proposes a kind of control block diagram of DC voltage fluctuation suppressing method suitable for modularization multi-level converter, by
Another additional control signals u is added in modulating wavedc2f_ref, the fluctuation of DC voltage is inhibited, and further improve MMC
Grid-connected current.Specifically includes the following steps:
(1) pass through building second order high-pass filtering function GHPF(s) U is extracteddMMCWave component udc2f, using phaselocked loop and
Single-phase Park coordinate transform is broken down into two DC component Udc2fdAnd Udc2fq, wherein due to UdMMCFluctuation be mainly two
Harmonic composition, high-pass filtering function GHPF(s) cutoff frequency is taken as 2 times of power frequency；
(2) the DC component U that will be decompositeddc2fdAnd Udc2fqRespectively with reference value Udc2fd_refAnd Udc2fq_refAfter making difference, warp
Pi regulator is crossed, the control component under dq coordinate system is obtained, is controlled using single-phase additional exchange is obtained after dq-a coordinate inverse transformation
Signal u processeddc2f_ref, wherein to realize the inhibition to wave component, take Udc2fd_ref=Udc2fq_ref=0；
(3) by additional control signals udc2f_refIt is superimposed to the voltage modulated wave u obtained by MMC system-level controllerabcref
In, modulation strategy and Pressure and Control by valve level controller obtain the trigger pulse of insulated gate bipolar transistor (IGBT),
Control MMC bridge arm submodule is switched on or off.
Fig. 1 is modular multi-level converter topological structure figure, and MMC uses submodule (SM) cascade mode, single son
Module generallys use half of H bridge structure.Each bridge arm is by N number of submodule and a current-limiting reactor L0Composition, a phase element
It is made of upper and lower two bridge arms.P, N indicates DC bus.
It is known MMC valve grade control in, the voltage modulated wave of input meets relational expression:
In formula, upj_refAnd unj_refThe modulating wave of the upper and lower bridge arm of respectively MMC, udiffjIt indicates inside bridge arm by alternate ring
The drop of unbalance voltage caused by flowing, uabcrefThe voltage modulated wave obtained by the system-level control system of MMC is indicated, by uabcref
Middle addition additional control signals udiffj_refThe loop current suppression of the alternate bridge arm of MMC may be implemented.In AC system unbalanced fault
Under, the U in formula (1)dMMCIn in addition to DC component, also contain wave component U based on two frequencys multiplicationdc2f.Therefore, with circulation
Inhibit thought, it can be by the way that another additional control signals u be added in modulating wavedc2f_ref, the fluctuation of DC voltage is carried out
Inhibit.
In formula (2), K is the proportional gain factor of filter, ωpIndicate cutoff frequency, ξ is damping ratio.In formula (3),
udc2fβBy udc2fIt is obtained after carrying out the phase shift of 1/4 period, since wave component is mainly made of two harmonics, therefore the phase shift time is
T/8, T indicate AC system period, T=0.02s.In formula (4), θ is by udc2fLocking phase obtains.
In conjunction with above-mentioned analysis, DC voltage fluctuation proposed by the invention inhibits the whole control block diagram of the lower MMC of strategy such as
Shown in Fig. 2.The voltage modulated wave for eventually entering into valve level controller not only includes the u obtained by system-level controllerabcref, also wrap
It includes the bridge arm change of current and inhibits component udiffj_refInhibit component u with DC voltage fluctuationdc2f_ref.The DC voltage fluctuation suppression proposed
In system strategy, DC voltage greatly reduces the calculated load of control system, and in control process only as unique control variable
One group of PI parameter is needed, control is simple direct.
Fig. 3, Fig. 4, Fig. 5 are indicated during AC system unbalanced fault, are inhibited using DC voltage fluctuation of the invention
Occurs for the system emulation waveform of tactful front and back, failure for 3s the moment, and duration 2s, DC voltage fluctuation inhibits strategy when 4s
Starting.It can be obtained by Fig. 3, after DC voltage fluctuation inhibition strategy starting at 4s, DC voltage fluctuation amplitude is obviously reduced.Fig. 4
Middle wave component Udc2fPeak value be decreased significantly.Meanwhile Fig. 5 shows that the distortion degree of MMC exchange side grid-connected current reduces, and is
System operation characteristic is effectively improved.Above-mentioned simulation result shows that DC voltage fluctuation proposed by the invention inhibits tactful energy
It enough reduces in AC system asymmetry situation, two double-frequency fluctuation of DC voltage as caused by negative sequence component, reducing failure influences model
It encloses.
The above examples only illustrate the technical idea of the present invention, and this does not limit the scope of protection of the present invention, all
According to the technical idea provided by the invention, any changes made on the basis of the technical scheme each falls within the scope of the present invention
Within.
Claims (5)
1. a kind of DC voltage fluctuation suppressing method suitable for modularization multi-level converter, which is characterized in that including as follows
Step:
Step 1, second order high-pass filtering function G is constructedHPF(s), and it is straight using the filter function extraction module multilevel converter
Flow side voltage UdMMCWave component udc2f, after phaselocked loop and single-phase Park coordinate transform, by wave component udc2fIt is decomposed into
Two DC component Udc2fdAnd Udc2fq；
Step 2, the DC component U that will be decompositeddc2fdWith reference value Udc2fd_refIt is poor to make, by DC component Udc2fqWith reference value
Udc2fq_refIt is poor to make, and two obtained differences pass through pi regulator, obtains the control component under dq coordinate system, sits using dq-a
Single-phase additional AC controling signal u is obtained after mark inverse transformationdc2f_ref, wherein Udc2fd_ref=Udc2fq_ref=0；
Step 3, by single-phase additional AC controling signal udc2f_refIt is superimposed to by modular multilevel converter system grade controller
Obtained voltage modulated wave uabcrefIn, modulation strategy and Pressure and Control by valve level controller obtain the trigger pulse of IGBT,
Control module multilevel converter bridge arm submodule is switched on or off.
2. being suitable for the DC voltage fluctuation suppressing method of modularization multi-level converter, feature according to claim 1
Be, the step 1 specific formula is as follows:
Wherein, GHPFIt (s) is second order high-pass filtering function, K is proportional gain factor, and s is complex frequency, and ξ is damping ratio, ωpTo cut
Only frequency, udc2fFor DC voltage UdMMCWave component, T be the AC system period, Udc2fd、Udc2fqIndicate direct current point
Amount, θ is phase angle.
3. being suitable for the DC voltage fluctuation suppressing method of modularization multi-level converter, feature according to claim 2
It is, the phase angle theta is by DC voltage UdMMCWave component udc2fLocking phase obtains.
4. being suitable for the DC voltage fluctuation suppressing method of modularization multi-level converter, feature according to claim 1
It is, second order high-pass filtering function G described in step 1HPF(s) cutoff frequency is 2 times of power frequency.
5. being suitable for the DC voltage fluctuation suppressing method of modularization multi-level converter, feature according to claim 1
It is, the phase angle used in dq-a coordinate inverse transformation described in step 2 is by DC voltage UdMMCWave component udc2fLocking phase obtains
It arrives.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112909985A (en) * | 2021-02-01 | 2021-06-04 | 国网江苏省电力有限公司 | Multi-terminal high-voltage direct-current power grid control method |
| CN112994071A (en) * | 2021-03-25 | 2021-06-18 | 深圳供电局有限公司 | Pulse power suppression circuit and suppression method based on double-active direct current converter |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101854061A (en) * | 2010-04-30 | 2010-10-06 | 浙江大学 | Circulating-current restraining method for three-phase modular multilevel convertor |
| CN102332809A (en) * | 2011-09-16 | 2012-01-25 | 浙江大学 | Method for suppressing direct voltage fluctuation of three-phase modular multilevel converter |
| US20140226373A1 (en) * | 2013-02-13 | 2014-08-14 | Korea Electrotechnology Research Institute | Method for Suppressing Circulating Current in Modular Multilevel Converter for High Voltage Direct-Current Transmission |
| CN106357143A (en) * | 2016-09-09 | 2017-01-25 | 重庆大学 | Loop current inhibition method suitable for modular multilevel converter |
| CN106533233A (en) * | 2016-12-21 | 2017-03-22 | 清华大学 | Modular multilevel converter optimization control method actively utilizing double frequency circulation |
| CN106712477A (en) * | 2017-03-09 | 2017-05-24 | 山东大学 | Simultaneous frequency-doubled and frequency-quadruplicated loop current suppression method suitable for MMC (Modular Multi-level Converter) |
| CN107046375A (en) * | 2017-05-27 | 2017-08-15 | 湖南大学 | A kind of MMC circular current control methods of bridge arm single-sensor |
-
2018
- 2018-08-06 CN CN201810884837.5A patent/CN109038637A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101854061A (en) * | 2010-04-30 | 2010-10-06 | 浙江大学 | Circulating-current restraining method for three-phase modular multilevel convertor |
| CN102332809A (en) * | 2011-09-16 | 2012-01-25 | 浙江大学 | Method for suppressing direct voltage fluctuation of three-phase modular multilevel converter |
| US20140226373A1 (en) * | 2013-02-13 | 2014-08-14 | Korea Electrotechnology Research Institute | Method for Suppressing Circulating Current in Modular Multilevel Converter for High Voltage Direct-Current Transmission |
| CN106357143A (en) * | 2016-09-09 | 2017-01-25 | 重庆大学 | Loop current inhibition method suitable for modular multilevel converter |
| CN106533233A (en) * | 2016-12-21 | 2017-03-22 | 清华大学 | Modular multilevel converter optimization control method actively utilizing double frequency circulation |
| CN106712477A (en) * | 2017-03-09 | 2017-05-24 | 山东大学 | Simultaneous frequency-doubled and frequency-quadruplicated loop current suppression method suitable for MMC (Modular Multi-level Converter) |
| CN107046375A (en) * | 2017-05-27 | 2017-08-15 | 湖南大学 | A kind of MMC circular current control methods of bridge arm single-sensor |
Non-Patent Citations (2)
| Title |
|---|
| 屠卿瑞: "模块化多电平换流器环流抑制控制器设计", 《电力***自动化》 * |
| 杨晓峰: "模块化多电平换流器MMC的环流抑制技术综述", 《电源学报》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112909985A (en) * | 2021-02-01 | 2021-06-04 | 国网江苏省电力有限公司 | Multi-terminal high-voltage direct-current power grid control method |
| CN112909985B (en) * | 2021-02-01 | 2022-10-11 | 国网江苏省电力有限公司 | Multi-terminal high-voltage direct-current power grid control method |
| CN112994071A (en) * | 2021-03-25 | 2021-06-18 | 深圳供电局有限公司 | Pulse power suppression circuit and suppression method based on double-active direct current converter |
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Application publication date: 20181218 |