CN107306034A - A kind of unbalance voltage method and system applied to voltage source converter - Google Patents
A kind of unbalance voltage method and system applied to voltage source converter Download PDFInfo
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- CN107306034A CN107306034A CN201610248973.6A CN201610248973A CN107306034A CN 107306034 A CN107306034 A CN 107306034A CN 201610248973 A CN201610248973 A CN 201610248973A CN 107306034 A CN107306034 A CN 107306034A
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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
- 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
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
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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
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
-
- 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)
- Direct Current Feeding And Distribution (AREA)
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Abstract
The present invention proposes a kind of unbalance voltage control method and system applied to voltage source converter, on the basis of the existing decomposition control algolithm based on positive-negative sequence, increase residual voltage control, finally give transverter and export new voltage reference value Uref_new, the new voltage reference value of inverter is exported corresponding voltage.Control method is simple and practical, reliability is high, suppresses exchange residual voltage and is transmitted to offside AC system by voltage source converter, non-faulting current conversion station is not influenceed by failure current conversion station friendship, this realizes isolating for failure station and non-faulting station fault in ac transmission system.
Description
Technical field
The invention belongs to Power System Flexible field of power transmission, and in particular to a kind of voltage source converter station unbalance control
Method and system.
Background technology
In modern AC power distribution network, one side big city load density constantly increases, transmission and distribution network scale it is continuous
Expand, the problems such as being limited by capacity of short circuit, electromagnetic looped network, power distribution network typically using high pressure subregion, in press off ring
The method of operation, cause system equipment utilization rate low, reliability decrease, another aspect client to power supply reliability,
The requirement of the quality of power supply is improved constantly again, and sensitive load gradually increases in large size city, and short term outage also can
Bring larger economic loss or even serious social influence.Flexible DC power transmission uses voltage source converter, can
With separately adjustable active and idle transmission, flexible direct current technology is that the existing power distribution network of solution is of problems effectively
One of means, flexible DC power transmission can realize that AC network is interconnected in the case where not increasing capacity of short circuit, real
Existing AC network Electromagnetic coupling, improves operation of power networks reliability, the lifting quality of power supply and operation of power networks efficiency.
AC-DC interconnecting power network based on flexible direct current power transmission and distribution is one of trend of power network development, based on modularization
The development of multilevel converter, solves voltage-sharing and loss that puzzlement is developed based on two level flexible DC power transmissions
Big problem, while reducing AC system harmonic wave, transless connection connection AC system is turned into one kind may.
So that current conversion station overall investment and volume are reduced and are possibly realized.
No matter there is transless, for earth-free, high resistant or through grounding through arc current conversion station, the change of current stands for a moment
During generation asymmetric fault, such as singlephase earth fault, failure station will produce residual voltage, based at present not
Balance control method is not controlled to residual voltage, Song Hong-Seok et al. " Dual
current control scheme for PWM converter under unbalance input voltage
conditions”(IEEE Transcation on Industial
Electronics.1999,46(5):953-959) be directed to unbalanced fault, respectively carry out negative sequence voltage feedforward and
Double sequence current inner loop controls, but negative-sequence current can only be suppressed.The old flourish thesis for the doctorate in sea is " during fault in ac transmission system
The control of VSC-HVDC systems and Preservation tactics research " positive-negative sequence unbalanced fault has carried out detailed derivation,
On the basis of using double sequence electric current loops, the reference value of negative-sequence current divides suppression AC negative phase-sequence and suppresses DC side two again
Frequency multiplication, but the two targets can not realize simultaneously.Calculating is shifted onto above to be controlled just for negative phase-sequence, and for
Residual voltage is transmitted to station during this station failure, is suppressed non-faulting station residual voltage and is not analyzed and researched.
A kind of " the three level neutral-point potential balance control methods based on injected zero-sequence voltage " of Zhou Jinghua et al. applications
Patent (application number 201010100682.5) is fluctuated for three level DC electric capacity neutral point voltage, by adopting
The capacitance voltage of collection dc bus side two calculates whether neutral point voltage balances, by under multi-carrier PWM modulation strategy
Vector controlled when three-phase current and neutral point current relation, residual voltage is positive and negative is injected into three-phase modulations ripple for selection,
Control neutral point potential balance patent is realized, its method and strategy just for three-level topology and use PWM
DC capacitor voltage neutral point imbalance problem caused by control algolithm, it is impossible to solve AC system generation asymmetric
Failure produces potential conduction to offside problem, specifically as shown in Figure 3.
In order to solve the problems, such as that residual voltage is transmitted to offside current conversion station by failure current conversion station, voltage source is given full play to
Current conversion station isolates AC fault ability, promotes flexible DC power transmission to transless transmission and distribution network systematic difference,
Need a kind of new AC system unbalanced fault unbalance voltage based on voltage source converter transmission ＆ distribution power technology
Control method.
The content of the invention
The purpose of the present invention, is that offer is asymmetric suitable for the AC system of voltage source converter transmission ＆ distribution power technology
The control method and system of failure unbalance voltage, simple and practical, reliability are high, can fast, accurately press down
System exchange residual voltage is transmitted to offside AC system by voltage source converter, realizes non-faulting station AC system
Voltage x current is not influenceed by failure station.
In order to achieve the above object, solution of the invention is：
A kind of unbalance voltage control method applied to voltage source converter, zero sequence voltage detection control generation
Residual voltage reference value Uoref is superimposed upon the Voltage Reference by open sea wharf and the generation of inner ring current control
On ripple Uref, new Voltage Reference ripple Uref_new is generated, converter valve is defeated according to new new Voltage Reference ripple
Go out corresponding relevant voltage and reach that non-faulting station output AC voltage is symmetrical normal voltage purpose.
The above-mentioned unbalance voltage control method applied to voltage source converter, residual voltage control generation zero sequence
Voltage reference value is referred specifically to：According to actual measurement alternating voltage or DC voltage, calculating obtains zero sequence alternating voltage Uo,
Residual voltage carries out low pass or bandpass filtering after selector, obtains zero sequence alternating voltage reference value Uoref.
The above-mentioned unbalance voltage control method applied to voltage source converter, open sea wharf and inner ring electricity
The three-phase alternating voltage reference wave Uref of flow control generation subtracts residual voltage reference value Uoref, obtains new
Voltage Reference ripple Uref_new.
The above-mentioned unbalance voltage control method applied to voltage source converter, zero sequence is calculated according to alternating voltage
Voltage method is that three-phase alternating voltage is added except in three, and residual voltage method both positive and negative polarity electricity is calculated according to DC voltage
Pressure, which is added, to be removed in two.
The above-mentioned unbalance voltage control method applied to voltage source converter, open sea wharf and inner ring electricity
The three-phase alternating voltage reference wave Uref of flow control generation subtracts residual voltage reference value Uoref, used
Residual voltage reference value Uoref, residual voltage is the residual voltage Uo_ac that AC can be selected to calculate,
The residual voltage Uo_dc that DC side can be selected to calculate, can also select the residual voltage Uo_ac that will be calculated
It is added with Uo_dc except in 2, selector carries out low pass to the residual voltage of selection or bandpass filtering obtains Uoref.
The above-mentioned unbalance voltage control method applied to voltage source converter, you can with applied to failure station,
Non-faulting station can also be applied to, can also failure station and non-faulting station apply simultaneously.
The present invention also provides a kind of unbalance voltage control system applied to voltage source converter, the control system
System includes zero sequence voltage detection control unit, outer loop-control unit, inner ring current control unit and reference wave adjustment
Unit, the zero sequence voltage detection control unit generates residual voltage reference value, outer-loop power control unit and interior
The Voltage Reference ripple of control is decomposed in the generation of circular current control unit based on positive-negative sequence, residual voltage reference value and is based on
The Voltage Reference ripple that positive-negative sequence decomposes control produces new Voltage Reference ripple, converter valve by reference wave adjustment unit
According to new new Voltage Reference ripple export corresponding relevant voltage reach non-faulting station output AC voltage for pair
Claim normal voltage purpose.
A kind of above-mentioned unbalance voltage control system applied to voltage source converter, zero sequence voltage detection control is single
Member includes alternating voltage actual measurement module, DC voltage actual measurement module, residual voltage generation module, residual voltage choosing
Module, filtration module are selected, wherein, alternating voltage actual measurement module actual measurement AC voltage, DC voltage actual measurement mould
Block surveys the positive and negative pole tension of direct current, and residual voltage generation module obtains zero sequence by alternating voltage computing module respectively
Voltage Uo_ac and DC voltage computing module obtain residual voltage Uo_dc, and residual voltage selecting module is to passing through
The residual voltage of residual voltage generation module generation is selected, and filtration module is produced to residual voltage selecting module
Residual voltage be filtered processing, finally give zero sequence alternating voltage reference value Uoref.
A kind of above-mentioned unbalance voltage control system applied to voltage source converter, reference wave adjustment unit is included
Reference wave computing module and clipping module, reference wave computing module is by outer-loop power control unit and interior circular current control
The residual voltage that the generation of zero sequence voltage detection control unit is subtracted based on Voltage Reference ripple Uref of unit generation processed
Reference value Uoref, obtains new Voltage Reference ripple Uref_new, clipping module is to new Voltage Reference than carrying out
Amplitude limit, amplitude limit amplitude is less than or equal to single bridge arm normal-sub number of modules.
A kind of above-mentioned unbalance voltage control system applied to voltage source converter, residual voltage selecting module can
The residual voltage Uo_dc calculated with selection DC side, the residual voltage that AC can also be selected to calculate
The residual voltage Uo_ac calculated is added except in 2 by Uo_ac, selection with Uo_dc.
Above-mentioned a kind of unbalance voltage control system applied to voltage source converter, you can with applied to failure station,
Non-faulting station can also be applied to, can also failure station and non-faulting station apply simultaneously.
After such scheme, the present invention can quickly, accurately realize the control of AC system unbalance voltage,
Suppress exchange residual voltage and offside AC system is transmitted to by voltage source converter, realize failure station and non-faulting
Station failure is isolated, it is ensured that non-faulting station alternating voltage is not by the unbalanced fault voltage influence of failure station.
Brief description of the drawings
Fig. 1 is that a kind of voltage source converter that is applied to of the present invention is applied to voltage source converter transmission ＆ distribution power technology
The control block diagram of the control method of AC system unbalanced fault unbalance voltage.
Fig. 2 be in the present invention flexible DC power transmission schematic diagram and using failure station after the control method of the present invention with
Non-faulting station alternating voltage waveform figure.
Fig. 3 is failure station and non-faulting station alternating voltage waveform figure when not using the inventive method in the present invention.
Embodiment
The embodiment to the present invention is described in detail below in conjunction with the accompanying drawings.
The present invention provides a kind of unbalance voltage control method applied to voltage source converter, suppresses exchange
Residual voltage is transmitted to offside AC system by voltage source converter, so as to reach that non-faulting station exports alternating current
Press as symmetrical normal voltage purpose.
Fig. 1 is a kind of control of unbalance voltage control method applied to voltage source converter in the present invention
Block diagram processed, described control method produces Voltage Reference ripple Uref in open sea wharf and inner ring current control
On the basis of, the residual voltage reference value that generation is controlled by residual voltage is subtracted, new reference wave Uref_new is generated,
Current conversion station is controlled according to new Uref_new, thus realize failure station and non-faulting station AC fault every
From non-faulting station output AC voltage is normal voltage.
A kind of foregoing unbalance voltage control method applied to voltage source converter, outer shroud control basis
Active power class control instruction Udcref or Pref and idle class control instruction Qref or Usref input,
Usd, usq for producing are converted by ABC/DC with reference to three-phase measurement voltage usa, usb, usc, three-phase is surveyed
Electric current isa, isb, isc calculate current active power P and Q by ABC/DC isd, isq produced,
Calculate inner ring current-order idref and iqref.The interior ring controller decomposed based on positive-negative sequence is defeated according to outer shroud
Enter idref and iqref instructions, with reference to voltage usd, the usq and electric current isd, isq changed by DQ,
Calculating obtains D axle reference wave ucdref and Q shaft voltage reference waves ucqref.Produced based on inner ring current control
Reference voltage ucdref and ucqref by DQ/ABC inverse transformations produce la tension de reference Uref est.
A kind of foregoing unbalance voltage control method applied to voltage source converter, zero sequence voltage detection
Control unit calculates residual voltage according to actual measurement alternating voltage usa, usb, usc and actual measurement DC voltage.Will be real
Survey alternating voltage usa, usb, usc to be added except residual voltage Uo_ac is obtained in three calculating, both positive and negative polarity will be surveyed
DC voltage udp, udn, which are added to remove to calculate in two, obtains residual voltage Uo_dc.
A kind of foregoing unbalance voltage control method applied to voltage source converter, residual voltage selection
The residual voltage that filter unit is produced to alternating voltage and DC voltage is selected, and DC side can be selected to calculate
Residual voltage, can also select AC calculate residual voltage, can also alternating current-direct current residual voltage be added remove
Residual voltage is obtained in 2.Residual voltage selector output voltage passes through low pass or bandpass filter, obtains zero sequence
Alternating voltage reference value Uo.
A kind of foregoing unbalance voltage control method applied to voltage source converter, reference wave adjustment is adjusted
The reference voltage ucdref and ucqref that whole unit produces inner ring current control are produced by DQ/ABC inverse transformations
Raw la tension de reference Uref est, subtracts the residual voltage Uo that residual voltage selection filter unit is produced, obtains new ginseng
Examine ripple Uref_new and be sent to valve control system.
A kind of foregoing unbalance voltage control method applied to voltage source converter, the control method
Can apply to failure station, non-faulting station can also be applied to, can also failure station and non-faulting station answer simultaneously
With.
In addition, the present invention also provides a kind of unbalance voltage control system applied to voltage source converter, it is described
Control system includes zero sequence voltage detection control unit, outer loop-control unit, inner ring control unit and reference wave and adjusted
Whole unit, the zero sequence voltage detection control unit generates residual voltage reference value, outer-loop power control unit and
The Voltage Reference ripple of control, residual voltage reference value and base are decomposed in the generation of inner ring current control unit based on positive-negative sequence
The Voltage Reference ripple for decomposing control in positive-negative sequence produces new Voltage Reference ripple, the change of current by reference wave adjustment unit
Valve exports corresponding relevant voltage according to new new Voltage Reference ripple and reaches that non-faulting station output AC voltage is
Symmetrical normal voltage purpose.
Zero sequence voltage detection control unit includes alternating voltage actual measurement module, DC voltage actual measurement module, zero sequence electricity
Generation module, residual voltage selecting module, filtration module are pressed, wherein, alternating voltage actual measurement module actual measurement three-phase
Alternating voltage usa, usb, usc, DC voltage actual measurement module actual measurement direct current positive and negative pole tension udp, udn, zero
Sequence voltage generation module obtains residual voltage by alternating voltage computing module and DC voltage computing module respectively
U0, residual voltage selecting module by AC and DC voltage residual voltage to being selected, residual voltage voltage
Reference value is the residual voltage Uo_dc that DC side can be selected to calculate, the zero sequence that AC can also be selected to calculate
Voltage Uo_ac, can also select alternating current-direct current residual voltage to be added and remove in 2.Filtration module is selected residual voltage
The residual voltage that module is produced is filtered processing, finally gives zero sequence alternating voltage reference value.
A kind of above-mentioned unbalance voltage control system applied to voltage source converter, reference wave adjustment unit is included
Reference wave computing module and clipping module, reference wave computing module is by outer-loop power control unit and interior circular current control
The Voltage Reference ripple Uref for decomposing control based on positive-negative sequence of unit generation processed subtracts the production of residual voltage control unit
Raw residual voltage reference value Uo, obtains new Voltage Reference ripple Uref_new, clipping module is to new voltage
With reference to than carrying out amplitude limit, amplitude limit amplitude is less than or equal to single bridge arm normal-sub number of modules.
Above-mentioned a kind of unbalance voltage control system applied to voltage source converter, you can with applied to failure station,
Non-faulting station can also be applied to, can also failure station and non-faulting station apply simultaneously.
Fig. 2 is two ends flexible DC power transmission schematic diagram, and flexible DC power transmission is connected using transless, cuts exchange
System is compensated distribution network, and 1 generation C phase faults of standing, 1 non-faulting phase voltage of standing is increased to failure
BeforeTimes, cut position is changed, and residual voltage is contained in three-phase, if not using of the invention a kind of
Applied to the unbalance voltage control method of voltage source converter, failure station station 1 and the waveform of non-faulting station station 2 are such as
Shown in Fig. 3, shown in Fig. 3, the alternating voltage of non-faulting station station 2 also occurs in that three-phase imbalance, 1 exchange of standing
Failure conducts arrive at a station 2, the unrealized Fault Isolation function of flexible direct current converter station, using this hair by flexible direct current
Failure station and non-faulting station alternating voltage waveform figure after bright control method are as shown in Fig. 2 unilateral event occurs for station 1
Barrier, 2 voltages of standing are unaffected, remain as normal voltage.
Embodiment is introduced by embodiment of two ends flexible DC power transmission by the present invention, but the invention is not restricted to two
Flexible DC power transmission is held, it is applied to the direct current connection system that two or more voltage source converter station is built, for example, unite
One flow controller, Multi-end flexible direct current transmission, DC distribution net etc..
Finally it should be noted that：Only illustrate technical scheme rather than its limitations with reference to above-described embodiment.
Those of ordinary skills in the art should understand that to：Those skilled in the art can be to specific implementation of the invention
Mode is modified or equivalent substitution, but these modifications or change are applying for pending patent requirements protection model
Within enclosing.
Claims (11)
1. a kind of unbalance voltage control method applied to voltage source converter, it is characterised in that：By zero sequence
The residual voltage reference value Uoref of voltage detecting control generation is superimposed upon by open sea wharf and interior circular current
On the Voltage Reference ripple Uref for controlling generation, new Voltage Reference ripple Uref_new is generated, converter valve is according to new
Voltage Reference ripple export corresponding relevant voltage, it is normal voltage to realize non-faulting station output AC voltage.
2. a kind of unbalance voltage control method applied to voltage source converter as claimed in claim 1,
A kind of unbalance voltage control applied to voltage source converter is characterized in that：Residual voltage control generation zero sequence
Voltage reference value is referred specifically to：According to actual measurement alternating voltage or DC voltage, calculating obtains zero sequence alternating voltage Uo,
Residual voltage carries out low pass or bandpass filtering after selector, obtains zero sequence alternating voltage reference value Uoref.
3. one kind that a kind of unbalance voltage applied to voltage source converter is controlled as claimed in claim 1 should
Unbalance voltage control method for voltage source converter, it is characterised in that：Open sea wharf and inner ring electricity
The three-phase alternating voltage reference wave Uref of flow control generation subtracts residual voltage reference value Uoref, obtains new
Voltage Reference ripple Uref_new.
4. a kind of unbalance voltage control method one applied to voltage source converter as claimed in claim 1
Plant and controlled applied to the unbalance voltage of voltage source converter, it is characterised in that：Zero sequence is calculated according to alternating voltage
Voltage method is that three-phase alternating voltage is added except in three, it is both positive and negative polarity to calculate residual voltage method according to DC voltage
Voltage, which is added, to be removed in two.
5. a kind of unbalance voltage control method one applied to voltage source converter as claimed in claim 1
Plant and controlled applied to the unbalance voltage of voltage source converter, it is characterised in that：Open sea wharf and inner ring electricity
The three-phase alternating voltage reference wave Uref of flow control generation subtracts residual voltage reference value Uoref, used
Residual voltage reference value Uoref, residual voltage can select the residual voltage Uo_ac that AC is calculated, and also may be used
With select DC side calculate residual voltage Uo_dc, it is also an option that by the residual voltage Uo_ac calculated with
Uo_dc, which is added, to be removed in 2, and selector carries out low pass to the residual voltage of selection or bandpass filtering obtains Uoref.
6. a kind of unbalance voltage control method one applied to voltage source converter as claimed in claim 1
Plant and controlled applied to the unbalance voltage of voltage source converter, it is characterised in that：The control method can be applied
In failure station, non-faulting station can also be applied to, or can simultaneously be applied with failure station and non-faulting station.
7. a kind of unbalance voltage control system applied to voltage source converter, it is characterised in that：The control
System processed includes zero sequence voltage detection control unit, outer-loop power control unit, inner ring current control unit and ginseng
Ripple adjustment unit is examined, the zero sequence voltage detection control unit generates residual voltage reference value Uoref, outer shroud work(
Rate control unit and the generation of inner ring current control unit Voltage Reference ripple Uref, residual voltage reference value Uoref
New Voltage Reference is produced by reference wave adjustment unit with the Voltage Reference ripple Uref that inner ring current control is produced
Ripple Uref_new, converter valve exports corresponding voltage according to new new Voltage Reference ripple Uref_new, reaches
Non-faulting station output AC voltage is symmetrical normal voltage purpose.
8. a kind of unbalance voltage control system applied to voltage source converter as claimed in claim 7,
It is characterized in that：Zero sequence voltage detection control unit comprising alternating voltage actual measurement module, DC voltage actual measurement module,
Residual voltage generation module, residual voltage selecting module, filtration module, wherein, alternating voltage actual measurement module is real
Survey AC voltage, the DC voltage actual measurement module actual measurement positive and negative pole tension of direct current, residual voltage generation module difference
Residual voltage Uo_ac is obtained by alternating voltage computing module and DC voltage computing module obtains residual voltage
Uo_dc, residual voltage selecting module is selected the residual voltage generated by residual voltage generation module,
The residual voltage that filtration module is produced to residual voltage selecting module is filtered processing, finally gives zero sequence exchange
Voltage reference value Uoref.
9. a kind of unbalance voltage control system applied to voltage source converter as claimed in claim 7,
It is characterized in that：Reference wave adjustment unit includes reference wave computing module and clipping module, reference wave computing module
Zero sequence is subtracted based on Voltage Reference ripple Uref by what outer-loop power control unit and inner ring current control unit were generated
The residual voltage reference value Uoref that voltage detecting control unit is produced, obtains new Voltage Reference ripple Uref_new,
Clipping module is less than or equal to single bridge arm normal submodule to new Voltage Reference than carrying out amplitude limit, amplitude limit amplitude
Number.
10. a kind of unbalance voltage control system applied to voltage source converter as claimed in claim 7,
It is characterized in that：Residual voltage selecting module can select the residual voltage Uo_dc that DC side is calculated,
The residual voltage Uo_ac that AC can be selected to calculate, it is also an option that by the residual voltage Uo_ac calculated
It is added with Uo_dc except in 2.
11. a kind of unbalance voltage control system applied to voltage source converter as claimed in claim 7,
It is characterized in that：The control system is that can apply to failure station, can also be applied to non-faulting station, may be used also
Applied simultaneously with failure station and non-faulting station.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610248973.6A CN107306034A (en) | 2016-04-20 | 2016-04-20 | A kind of unbalance voltage method and system applied to voltage source converter |
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| CN201610248973.6A CN107306034A (en) | 2016-04-20 | 2016-04-20 | A kind of unbalance voltage method and system applied to voltage source converter |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101753044A (en) * | 2010-01-26 | 2010-06-23 | 北方工业大学 | Three-level midpoint potential balance control method based on zero-sequence voltage injection |
| CN104811067A (en) * | 2015-04-30 | 2015-07-29 | 山东大学 | PR (proportional resonant) controller-based NMC-HVDC (modular multilevel converter-high voltage direct current) circulating current suppression method |
-
2016
- 2016-04-20 CN CN201610248973.6A patent/CN107306034A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101753044A (en) * | 2010-01-26 | 2010-06-23 | 北方工业大学 | Three-level midpoint potential balance control method based on zero-sequence voltage injection |
| CN104811067A (en) * | 2015-04-30 | 2015-07-29 | 山东大学 | PR (proportional resonant) controller-based NMC-HVDC (modular multilevel converter-high voltage direct current) circulating current suppression method |
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Application publication date: 20171031 |