CN106329560A - Power improving method during alternating current fault period of hybrid direct current rectification side - Google Patents
Power improving method during alternating current fault period of hybrid direct current rectification side Download PDFInfo
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- CN106329560A CN106329560A CN201610987079.0A CN201610987079A CN106329560A CN 106329560 A CN106329560 A CN 106329560A CN 201610987079 A CN201610987079 A CN 201610987079A CN 106329560 A CN106329560 A CN 106329560A
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Classifications
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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
- 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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Abstract
A power boosting method during an alternating current fault of a hybrid direct current rectification side. On the basis that the rectifier station LCC adopts constant direct current control and the inverter station MMC adopts constant direct current control, an alternating current voltage detection module is configured for the rectifier station LCC; and configuring a maximum modulation ratio module for the inverter station MMC. When the alternating voltage detection module of the LCC detects that the alternating voltage is lower than a set value, the maximum modulation ratio module of the MMC enables, and the control mode of the MMC is converted from constant direct voltage control to maximum modulation ratio control. The invention has the beneficial effects that: when the alternating current fault occurs on the rectifying side of the hybrid direct current power transmission system, the inverter station MMC is converted into the maximum modulation ratio control, and the direct current transmission power can be effectively improved.
Description
Technical field
The present invention relates to a kind of based on line commutation inverter LCC and modular multi-electrical-level voltage source current converter MMC mixed
Close DC transmission system, belong to high voltage power transmission technical field.
Background technology
China, because of features such as Regional Economic Development imbalance, energy contrary distributions, needs the defeated of long-term employing transferring electricity from the west to the east
Electricity scheme.LCC-HVDC has significant advantage on long-distance and large-capacity power transmission and Power System Interconnection, but a plurality of LCC-HVDC drop point
The Multi-infeed HVDC transmission system formed in same AC system also brings series of problems.The most serious is then by
Multiple inverter is caused to cascade commutation failure in Inverter Station AC system Voltage Drop.Introduce flexible direct current in inverter side can change
The performance of kind system, reduces the probability of commutation failure.Therefore, existing customary DC engineering is carried out Inverter Station flexibility transformation,
It is the effective scheme solving Multi-infeed HVDC transmission system potential cascade commutation failure problem, improved mixed DC system
System converting plant adopts line commutation current conversion station (LCC), Inverter Station newly-built modular multilevel current conversion station (MMC).
This Hybrid HVDC system topology, because flexible direct current has a fast response time, it is excellent that control accuracy is high etc.
Gesture, generally selects Inverter Station MMC constant DC voltage control, and converting plant LCC selects constant DC current control.But its control system is deposited
In following technical problem: when the AC system of converting plant LCC breaks down, the DC voltage of converting plant LCC will be with exchange
System voltage declines, and Inverter Station MMC uses constant DC voltage control and direct voltage reference value constant, therefore mixed DC
Conveying power will be remarkably decreased.
Therefore method for enhancing power during the present invention proposes a kind of mixed DC rectification side AC fault, in converting plant
When LCC occurs AC fault, the alternating voltage detection module of our station will judge whether alternating voltage is less than preset value, if being less than
Preset value, will inform that Inverter Station MMC makes it enable maximum modulation control module, and Inverter Station is converted into by constant DC voltage control
Maximum modulation control model, thus increase modulation ratio, the DC voltage of reduction Inverter Station, and then make mixed DC transmit merit
Rate gets a promotion.
Summary of the invention
The purpose of the application is to provide method for enhancing power during a kind of mixed DC rectification side AC fault, in converting plant
When LCC occurs AC fault, the alternating voltage detection module of our station will judge whether alternating voltage is less than preset value, if being less than
Preset value, will inform that Inverter Station MMC makes it enable maximum modulation control module, and Inverter Station is converted into by constant DC voltage control
Maximum modulation control model.
The present invention is concrete by the following technical solutions:
Method for enhancing power during a kind of mixed DC rectification side AC fault, Polynuclear complex system includes two
End current conversion station, i.e. one converting plant LCC and Inverter Station MMC, it is straight that described converting plant LCC is used for AC electric energy rectification
Stream electric energy also sends it to DC link, and described Inverter Station MMC is used for the electric energy inversion of described DC line as handing over
Stream electric energy also injects each self-corresponding AC network, it is characterised in that:
Constant DC current control is used at converting plant LCC, on the basis of Inverter Station MMC selects constant DC voltage control,
Converting plant LCC configures alternating voltage detection module, configures maximum modulation module for Inverter Station MMC, in the exchange of converting plant LCC
Voltage detection module detects when alternating voltage is less than setting value, and the maximum modulation module of Inverter Station MMC enables, Inverter Station
The control model of MMC is converted into maximum modulation control by constant DC voltage control.
Further preferred:
Arranging alternating voltage preset value A value, converting plant LCC alternating voltage detection module gathers the net side three of converting plant LCC
Phase voltage, and calculate meansigma methods U of three phase voltage virtual valuesabc, work as UabcDuring less than preset value A value, alternating voltage detection mould
Block output AC low voltage signal is to Inverter Station MMC.
Described alternating voltage preset value A value span is 0 to Uacnor, preferably value isWherein UacnorFor the specified phase voltage of AC, Ud2refDC voltage reference for Inverter Station MMC
Value.Maximum modulation desired value B value is set, receives converting plant LCC alternating voltage in Inverter Station MMC configuration maximum modulation module
After the low AC voltage signal of detection module output, the maximum modulation module of Inverter Station MMC will enable, and Inverter Station MMC is by fixed
DC voltage control is converted into maximum modulation control；Low AC voltage in the output of converting plant LCC alternating voltage detection module
After blackout, maximum modulation module will move out, and Inverter Station MMC is controlled to switch back into that to determine unidirectional current voltage-controlled by maximum modulation
System.
Described maximum modulation desired value B value span is mnorTo 1, preferably value is 1, wherein mnorFor specified modulation
Ratio.
During the mixed DC rectification side AC fault of the present invention, method for enhancing power comprises the following steps:
Step 1: configure alternating voltage detection module for converting plant LCC, and alternating voltage preset value A value, this module are set
Gather the net side three-phase voltage of converting plant LCC, and calculate meansigma methods U of three phase voltage virtual valuesabc, work as UabcLess than preset value
During A value, alternating voltage detection module output AC low voltage signal is to Inverter Station MMC；
Step 2: configure maximum modulation module for Inverter Station MMC, and maximum modulation desired value B value is set, receiving
After the low AC voltage signal of converting plant LCC alternating voltage detection module output, the maximum modulation module of Inverter Station MMC will make
Can, first maximum modulation module calculates the actual modulated ratio of current Inverter Station MMC, then by currently practical modulation ratio and maximum
Modulating and do difference than desired value, and obtain DC voltage reference correction through PI controller, this DC voltage correction is by superposition
To DC voltage controller, revise direct voltage reference value so that Inverter Station MMC is converted into maximum tune by constant DC voltage control
System ratio controls；
Step 3: after the low AC voltage blackout of converting plant LCC alternating voltage detection module output, Inverter Station MMC
Maximum modulation module will move out, Inverter Station MMC by maximum modulation control switch back into constant DC voltage control.
The present invention has a following useful technique effect:
When converting plant LCC occurs AC fault, the present invention can make Inverter Station MMC be converted into by constant DC voltage control
Big modulation ratio control model, thus increase Inverter Station MMC modulation ratio, the DC voltage of reduction Inverter Station MMC, and then make exchange
During fault, mixed DC through-put power gets a promotion.
Accompanying drawing explanation
Fig. 1 is mixed DC system topological figure based on LCC and MMC；
Fig. 2 is method for enhancing power flow chart during mixed DC rectification side AC fault disclosed by the invention；Fig. 3 is whole
The alternating voltage detection module control block diagram of stream station LCC；
Fig. 4 is Inverter Station MMC maximum modulation module control block diagram.
Detailed description of the invention:
Below in conjunction with Figure of description and specific embodiment, the technical scheme of the application is described in further detail.
The invention discloses method for enhancing power during a kind of mixed DC rectification side AC fault, described mixed DC is defeated
Electricity system as shown in Figure 1, including two ends current conversion station, i.e. one converting plant LCC and Inverter Station MMC, described converting plant LCC
For being direct current energy by AC electric energy rectification and sending it to DC link, described Inverter Station MMC is for by described
The electric energy inversion of DC line be AC energy and inject each self-corresponding AC network.
Constant DC current control is used at converting plant LCC, on the basis of Inverter Station MMC selects constant DC voltage control, for
Converting plant LCC configures alternating voltage detection module, configures maximum modulation module for Inverter Station MMC, in the exchange of converting plant LCC
Voltage detection module detects when alternating voltage is less than setting value, and the maximum modulation module of Inverter Station MMC enables, Inverter Station
The control model of MMC is converted into maximum modulation control by constant DC voltage control.
For the application mixed DC rectification side AC fault during power boosting scheme is discussed in detail, the application is with Fig. 1 institute
Showing that topological structure is embodiment, wherein, current conversion station LCC is converting plant, and L1, L12 are DC line smoothing reactors, and T1, T12 are
Its converter power transformer, UF is wave filter on AC side, and AC1 is the AC system that converting plant is accessed；MMC1 is Inverter Station, and L2 is bridge
Arm reactor, T2 is connection transformer, the AC system that AC2 Inverter Station accesses.
The technical scheme control flow of the application as shown in Figure 2, comprises the following steps:
Step 1: configure alternating voltage detection module for converting plant LCC, and alternating voltage preset value A value is set.A value value
Scope is 0 to Uacnor, preferably value isWherein UacnorFor the specified phase voltage of AC,
Ud2refDirect voltage reference value for Inverter Station MMC.Alternating voltage detection module gathers the net side three-phase voltage of converting plant LCC,
And calculate meansigma methods U of three phase voltage virtual valuesabc, alternating voltage detection module output AC low voltage signal is to Inverter Station
MMC, signal is RST, and control block diagram is as shown in Figure 3.Time properly functioning, UabcMore than preset value A value, the maximum tune of Inverter Station MMC
System is cleared than module, does not enables；When converting plant AC generation AC fault, UabcDuring less than preset value A value, Inverter Station
MMC maximum modulation module enables.
Step 2: configure maximum modulation module for Inverter Station MMC, and maximum modulation desired value B value is set, B value value
Scope is mnorTo 1, preferably value is 1, wherein mnorCompare for specified modulation.Receiving converting plant LCC alternating voltage detection module
After the low AC voltage signal of output, the maximum modulation module of Inverter Station MMC will enable, and first maximum modulation module calculates
The actual modulated ratio of current Inverter Station MMC, then does difference by currently practical modulation ratio with maximum modulation desired value, and through PI
Controller obtains DC voltage reference correction, and this DC voltage correction will be superimposed to DC voltage controller, revise direct current
Voltage reference value so that Inverter Station MMC is converted into maximum modulation control by constant DC voltage control.Control block diagram such as Fig. 4 institute
Show, first by modulation voltage vd、vqInverse transformation obtains three-phase modulations voltage va、vb、vc, wherein vd、vqD axle for Inverter Station MMC
And q axle modulation voltage, va、vb、vcA, b, c three-phase modulations voltage for Inverter Station MMC.Calculate the peak value of three-phase modulations voltage again
Meansigma methods vm, then vmWith 2/Ud2It is multiplied and i.e. can get currently practical modulation than m, Ud2DC voltage for Inverter Station MMC.Currently
Actual modulated is done difference than m with maximum modulation desired value B and is obtained deviation value △ m, eventually passes PI controller and obtains DC voltage
With reference to correction △ Ud2_ref.The output △ U of maximum modulation moduled2_refThe DC voltage being added to Inverter Station MMC is joined
Examine Ud2_refOn, to revise direct voltage reference value, thus play the purpose reducing DC voltage, Inverter Station DC voltage reduces to be had
Help promote mixed DC through-put power during rectification side AC fault.
Step 3: after the low AC voltage blackout of converting plant LCC alternating voltage detection module output, i.e. converting plant
After AC fault is eliminated, the maximum modulation module of Inverter Station MMC will be cleared thus out of service, and Inverter Station MMC is by
Big modulation switches back into constant DC voltage control than control, and mixed DC system recovery is properly functioning.
It is above the present invention detailed description to embodiment, despite for above-mentioned specific embodiment, it should be apparent that
Can make various changes and modifications without departing from the range of the disclosure that the claims limit.
Claims (9)
1. a method for enhancing power during mixed DC rectification side AC fault, Polynuclear complex system includes two ends
Current conversion station, i.e. one converting plant LCC and Inverter Station MMC, it is direct current that described converting plant LCC is used for AC electric energy rectification
Electric energy also sends it to DC link, and it is exchange that described Inverter Station MMC is used for the electric energy inversion of described DC line
Electric energy also injects each self-corresponding AC network, it is characterised in that:
Constant DC current control is used, on the basis of Inverter Station MMC selects constant DC voltage control, in rectification at converting plant LCC
The LCC that stands configures alternating voltage detection module, configures maximum modulation module for Inverter Station MMC, at the alternating voltage of converting plant LCC
Detection module detects when alternating voltage is less than setting value, and the maximum modulation module of Inverter Station MMC enables, Inverter Station MMC
Control model is converted into maximum modulation control by constant DC voltage control.
Method for enhancing power during mixed DC rectification side AC fault the most according to claim 1, it is characterised in that:
Arranging alternating voltage preset value A value, converting plant LCC alternating voltage detection module gathers the net side three-phase electricity of converting plant LCC
Pressure, and calculate meansigma methods U of three phase voltage virtual valuesabc, work as UabcDuring less than preset value A value, alternating voltage detection module is defeated
Go out low AC voltage signal to Inverter Station MMC.
Method for enhancing power during mixed DC rectification side AC fault the most according to claim 2, it is characterised in that:
Described alternating voltage preset value A value span is 0 to Uacnor, wherein, wherein UacnorFor the specified phase voltage of AC.
Method for enhancing power during mixed DC rectification side AC fault the most according to claim 3, it is characterised in that:
Described alternating voltage preset value A value value isWherein Ud2refDirect current for Inverter Station MMC
Voltage reference value.
5., according to method for enhancing power during the mixed DC rectification side AC fault described in Claims 2 or 3, its feature exists
In:
Maximum modulation desired value B value is set, receives converting plant LCC alternating current in Inverter Station MMC configuration maximum modulation module
After the low AC voltage signal of pressure detection module output, the maximum modulation module of Inverter Station MMC will enable, Inverter Station MMC by
Constant DC voltage control is converted into maximum modulation control；The low electricity of exchange in the output of converting plant LCC alternating voltage detection module
After pressure blackout, maximum modulation module will move out, and Inverter Station MMC is controlled to switch back into that to determine unidirectional current voltage-controlled by maximum modulation
System.
Method for enhancing power during mixed DC rectification side AC fault the most according to claim 5, it is characterised in that:
Described maximum modulation desired value B value span is mnorTo 1, wherein mnorCompare for specified modulation.
Method for enhancing power during mixed DC rectification side AC fault the most according to claim 6, it is characterised in that:
Described maximum modulation desired value B value value is 1.
8. method for enhancing power during a mixed DC rectification side AC fault, it is characterised in that described rectification side exchange event
During barrier, method for enhancing power comprises the following steps:
Step 1: configure alternating voltage detection module for converting plant LCC, and arrange alternating voltage preset value A value, this module gathers
The net side three-phase voltage of converting plant LCC, and calculate meansigma methods U of three phase voltage virtual valuesabc, work as UabcLess than preset value A value
Time, alternating voltage detection module output AC low voltage signal is to Inverter Station MMC；
Step 2: configure maximum modulation module for Inverter Station MMC, and maximum modulation desired value B value is set, receiving rectification
After the low AC voltage signal of LCC alternating voltage detection module of standing output, the maximum modulation module of Inverter Station MMC will enable,
Inverter Station MMC is made to be converted into maximum modulation control by constant DC voltage control.
Step 3: after the low AC voltage blackout of converting plant LCC alternating voltage detection module output, Inverter Station MMC is
Big modulation will move out than module, and Inverter Station MMC is controlled to switch back into constant DC voltage control by maximum modulation.
Method for enhancing power during mixed DC rectification side AC fault the most according to claim 8, it is characterised in that:
In step 2, after maximum modulation module enables, first calculate the actual modulated ratio of current Inverter Station MMC, then ought
Front actual modulated does difference than with maximum modulation desired value, and obtains DC voltage reference correction through PI controller, and this is straight
Stream voltage increment will be superimposed to DC voltage controller, revise direct voltage reference value, so that Inverter Station MMC is by the most straight
Stream Control of Voltage is converted into maximum modulation control.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107204626A (en) * | 2017-06-09 | 2017-09-26 | 电子科技大学 | A kind of LCC MMC interlock hybrid bypolar DC transmission system |
| CN109193736A (en) * | 2018-09-26 | 2019-01-11 | 云南电网有限责任公司电力科学研究院 | A kind of STATCOM adaptive voltage control method applied to DC converter station |
| WO2022166867A1 (en) * | 2021-02-08 | 2022-08-11 | 南京南瑞继保电气有限公司 | Method and apparatus for handling direct-current side line fault of voltage source converter |
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| WO2022166867A1 (en) * | 2021-02-08 | 2022-08-11 | 南京南瑞继保电气有限公司 | Method and apparatus for handling direct-current side line fault of voltage source converter |
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