CN106329560B - Method for enhancing power during a kind of mixed DC rectification side AC fault - Google Patents
Method for enhancing power during a kind of mixed DC rectification side AC fault Download PDFInfo
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- CN106329560B CN106329560B CN201610987079.0A CN201610987079A CN106329560B CN 106329560 B CN106329560 B CN 106329560B CN 201610987079 A CN201610987079 A CN 201610987079A CN 106329560 B CN106329560 B CN 106329560B
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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
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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
- 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
Method for enhancing power during a kind of mixed DC rectification side AC fault.Constant DC current control is used in converting plant LCC, Inverter Station MMC is selected on the basis of constant DC voltage control, configures alternating voltage detection module for converting plant LCC；Maximum modulation module is configured for Inverter Station MMC.When the alternating voltage detection module of converting plant LCC detects alternating voltage lower than setting value, the maximum modulation module of Inverter Station MMC is enabled, and the control model of Inverter Station MMC is converted into maximum modulation control by constant DC voltage control.The beneficial effects of the present invention are: Hybrid HVDC system is when AC fault occurs for rectification side, Inverter Station MMC is converted into maximum modulation control, can effectively promote direct current transmission power.
Description
Technical field
It is mixed based on line commutation inverter LCC and modular multi-electrical-level voltage source current converter MMC that the present invention relates to a kind of
DC transmission system is closed, high voltage power transmission technical field is belonged to.
Background technique
China needs for a long time because of the features such as Regional Economic Development is uneven, energy contrary distribution using the defeated of transferring electricity from the west to the east
Electric scheme.LCC-HVDC has significant advantage, but a plurality of LCC-HVDC drop point on long-distance and large-capacity power transmission and Power System Interconnection
Multi-infeed HVDC transmission system, which is formed by, in same AC system also brings a series of problems.Wherein most serious be then by
Lead to multiple inverter cascade commutation failures in Inverter Station AC system Voltage Drop.Introducing flexible direct current in inverter side can change
The performance of kind system, reduces the probability of commutation failure.Therefore, Inverter Station flexibility transformation is carried out to existing customary DC engineering,
It is an effective scheme for solving the problems, such as the potential cascade commutation failure of Multi-infeed HVDC transmission system, improved mixed DC system
System converting plant adopts line commutation converter station (LCC), and Inverter Station creates modular multilevel converter station (MMC).
This Hybrid HVDC system topology, because flexible direct current has fast response time, control precision height etc. is excellent
Gesture, usually 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 decline, and Inverter Station MMC uses constant DC voltage control and direct voltage reference value is constant, therefore mixed DC
Transmission power will be remarkably decreased.
Therefore the invention proposes method for enhancing power during a kind of mixed DC rectification side AC fault, in converting plant
When AC fault occurs for LCC, the alternating voltage detection module of our station will judge whether alternating voltage is lower than preset value, if being lower than
Preset value will inform that Inverter Station MMC makes its enabled maximum modulation control module, and Inverter Station is converted by constant DC voltage control
Maximum modulation control model, thus the DC voltage for increasing modulation ratio, reducing Inverter Station, so that mixed DC transmits function
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 AC fault occurs for LCC, the alternating voltage detection module of our station will judge whether alternating voltage is lower than preset value, if being lower than
Preset value will inform that Inverter Station MMC makes its enabled maximum modulation control module, and Inverter Station is converted by constant DC voltage control
Maximum modulation control model.
The present invention specifically uses following technical scheme:
Method for enhancing power during a kind of mixed DC rectification side AC fault, Polynuclear complex system include two
Converter station is held, i.e. a converting plant LCC and Inverter Station a MMC, the converting plant LCC are rectified into directly for that will exchange side electric energy
Galvanic electricity can and send it to DC link, and the Inverter Station MMC is used to the electric energy inversion of the DC line be to hand over
Galvanic electricity can and inject corresponding AC network, it is characterised in that:
Constant DC current control is used in converting plant LCC, Inverter Station MMC is selected on the basis of constant DC voltage control,
Converting plant LCC configures alternating voltage detection module, maximum modulation module is configured for Inverter Station MMC, in the exchange of converting plant LCC
When voltage detection module detects alternating voltage lower than setting value, the maximum modulation module of Inverter Station MMC is enabled, Inverter Station
The control model of MMC is converted into maximum modulation control by constant DC voltage control.
It is further preferred:
Alternating voltage preset value A value is set, and converting plant LCC alternating voltage detection module acquires the net side three of converting plant LCC
Phase voltage, and calculate the average value U of three phase voltage virtual valuesabc, work as UabcWhen less than preset value A value, alternating voltage detects mould
Block exports low AC voltage signal to Inverter Station MMC.
The alternating voltage preset value A value value range is 0 to Uacnor, preferably value isWherein UacnorTo exchange side specified phase voltage, Ud2refJoin for the DC voltage of Inverter Station MMC
Examine value.Maximum modulation target value B value is set, receives converting plant LCC alternating current in Inverter Station MMC configuration maximum modulation module
Press detection module output low AC voltage signal after, the maximum modulation module of Inverter Station MMC will enable, Inverter Station MMC by
Constant DC voltage control is converted into maximum modulation control；In the low electricity of exchange of converting plant LCC alternating voltage detection module output
After pressing blackout, maximum modulation module be will move out, and Inverter Station MMC is switched back into that determine direct current voltage-controlled by maximum modulation control
System.
The maximum modulation target value B value value range is mnorTo 1, preferably value is 1, wherein mnorFor specified modulation
Than.
Method for enhancing power during mixed DC rectification side AC fault of the invention the following steps are included:
Step 1: configuring alternating voltage detection module for converting plant LCC, and alternating voltage preset value A value, the module are set
The net side three-phase voltage of converting plant LCC is acquired, and calculates the average value U of three phase voltage virtual valuesabc, work as UabcLess than preset value
When A value, alternating voltage detection module exports low AC voltage signal to Inverter Station MMC；
Step 2: configuring maximum modulation module for Inverter Station MMC, and maximum modulation target 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, maximum modulation module calculates the actual modulated ratio of current Inverter Station MMC first, then by currently practical modulation ratio and maximum
Modulation ratio target value makes the difference, and obtains DC voltage with reference to correction amount by PI controller, which will be superimposed
To DC voltage controller, direct voltage reference value is corrected, so that Inverter Station MMC is converted into maximum tune by constant DC voltage control
System is than control；
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 invention has the following beneficial technical effects:
When AC fault occurs for converting plant LCC, the present invention can be such that Inverter Station MMC is converted into most by constant DC voltage control
Big modulation ratio control model, thus the DC voltage for increasing Inverter Station MMC modulation ratio, reducing Inverter Station MMC, so that exchange
Mixed DC transimission power gets a promotion during failure.
Detailed description of the invention
Fig. 1 is the mixed DC system topological figure based on LCC and MMC；
Method for enhancing power flow chart during Fig. 2 is mixed DC rectification side AC fault disclosed by the invention；
Fig. 3 is the alternating voltage detection module control block diagram of converting plant LCC；
Fig. 4 is Inverter Station MMC maximum modulation module control block diagram.
Specific embodiment:
It is described in further detail with reference to the accompanying drawings of the specification with technical solution of the specific embodiment to the application.
The invention discloses method for enhancing power, the mixed DC during a kind of mixed DC rectification side AC fault are defeated
Electric system is as shown in Fig. 1, including both ends converter station, i.e. a converting plant LCC and Inverter Station a MMC, the converting plant LCC
It is rectified into direct current energy for side electric energy will to be exchanged and sends it to DC link, the Inverter Station MMC will be for will be described
The electric energy inversion of DC line be AC energy and to inject corresponding AC network.
Constant DC current control is used in converting plant LCC, Inverter Station MMC is selected on the basis of constant DC voltage control, is
Converting plant LCC configures alternating voltage detection module, maximum modulation module is configured for Inverter Station MMC, in the exchange of converting plant LCC
When voltage detection module detects alternating voltage lower than setting value, the maximum modulation module of Inverter Station MMC is enabled, Inverter Station
The control model of MMC is converted into maximum modulation control by constant DC voltage control.
For power boosting scheme during the application mixed DC rectification side AC fault is discussed in detail, the application is with Fig. 1 institute
Show that topological structure is embodiment, wherein converter station LCC is converting plant, and L1, L12 are DC line smoothing reactors, and T1, T12 are
Its converter power transformer, UF are wave filter on AC sides, and AC1 is the AC system that converting plant is accessed；MMC1 is Inverter Station, and L2 is bridge
Arm reactor, T2 are connection transformer, the AC system of AC2 Inverter Station access.
The technical solution control flow of the application is as shown in Fig. 2, comprising the following steps:
Step 1: configuring alternating voltage detection module for converting plant LCC, and alternating voltage preset value A value is set.A value value
Range is 0 to Uacnor, preferably value isWherein UacnorTo exchange side specified phase voltage,
Ud2refFor the direct voltage reference value of Inverter Station MMC.Alternating voltage detection module acquires the net side three-phase voltage of converting plant LCC,
And calculate the average value U of three phase voltage virtual valuesabc, alternating voltage detection module output low AC voltage signal to Inverter Station
MMC, signal RST, control block diagram are as shown in Figure 3.When normal operation, UabcGreater than preset value A value, the maximum of Inverter Station MMC is adjusted
System is cleared than module, is not enabled；When AC fault occurs for converting plant exchange side, UabcWhen less than preset value A value, Inverter Station
MMC maximum modulation module is enabled.
Step 2: configuring maximum modulation module for Inverter Station MMC, and maximum modulation target value B value, B value value are set
Range is mnorTo 1, preferably value is 1, wherein mnorFor specified modulation ratio.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 be enabled, and maximum modulation module calculates first
The actual modulated ratio of current Inverter Station MMC, then makes the difference currently practical modulation ratio and maximum modulation target value, and pass through PI
Controller obtains DC voltage with reference to correction amount, which will be superimposed to DC voltage controller, corrects 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、vqFor the d axis of Inverter Station MMC
And q axis modulation voltage, va、vb、vcFor a, b, c three-phase modulations voltage of Inverter Station MMC.The peak value of three-phase modulations voltage is calculated again
Average value vm, then vmWith 2/Ud2Currently practical modulation ratio m, U can be obtained in multiplicationd2For the DC voltage of Inverter Station MMC.Currently
Actual modulated ratio m and maximum modulation target value B make the difference to obtain deviation △ m, finally obtain DC voltage by PI controller
With reference to correction amount △ Ud2_ref.The output △ U of maximum modulation moduled2_refThe DC voltage ginseng of Inverter Station MMC will be added to
Examine Ud2_refOn, direct voltage reference value is corrected, to play the purpose for reducing DC voltage, the reduction of Inverter Station DC voltage has
Help promote transimission power of the mixed DC 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 removed, the maximum modulation module of Inverter Station MMC will be cleared to out of service, and Inverter Station MMC is by most
Big modulation ratio control switches back into constant DC voltage control, and mixed DC system is restored to operate normally.
It is detailed description of the present invention to embodiment above, despite for above-mentioned specific embodiment, it should be apparent that
Not departing from can make various changes and modifications within the scope of the disclosure of the claims restriction.
Claims (8)
1. method for enhancing power during a kind of mixed DC rectification side AC fault, Polynuclear complex system include both ends
Converter station, i.e. a converting plant LCC and Inverter Station a MMC, the converting plant LCC are rectified into direct current for that will exchange side electric energy
Electric energy simultaneously sends it to DC link, and the Inverter Station MMC is used to the electric energy inversion of the DC line be exchange
Electric energy simultaneously injects corresponding AC network, it is characterised in that:
Constant DC current control is used in converting plant LCC, Inverter Station MMC is selected on the basis of constant DC voltage control, rectified
The LCC that stands configures alternating voltage detection module, maximum modulation module is configured for Inverter Station MMC, in the alternating voltage of converting plant LCC
When detection module detects alternating voltage lower than setting value, the maximum modulation module of Inverter Station MMC is enabled, Inverter Station MMC's
Control model is converted into maximum modulation control by constant DC voltage control；
Alternating voltage preset value A value is set, and converting plant LCC alternating voltage detection module acquires the net side three-phase electricity of converting plant LCC
Pressure, and calculate the average value U of three phase voltage virtual valuesabc, work as UabcWhen less than preset value A value, alternating voltage detection module is defeated
Low AC voltage signal is to Inverter Station MMC out.
2. method for enhancing power during mixed DC rectification side AC fault according to claim 1, it is characterised in that:
The alternating voltage preset value A value value range is 0 to Uacnor, wherein UacnorTo exchange side specified phase voltage.
3. method for enhancing power during mixed DC rectification side AC fault according to claim 2, it is characterised in that:
The alternating voltage preset value A value value isWherein Ud2refFor the direct current of Inverter Station MMC
Voltage reference value.
4. method for enhancing power during mixed DC rectification side AC fault according to claim 1 or 2, feature exist
In:
Maximum modulation target value B value is set, receives converting plant LCC alternating current in Inverter Station MMC configuration maximum modulation module
Press detection module output low AC voltage signal after, the maximum modulation module of Inverter Station MMC will enable, Inverter Station MMC by
Constant DC voltage control is converted into maximum modulation control；In the low electricity of exchange of converting plant LCC alternating voltage detection module output
After pressing blackout, maximum modulation module be will move out, and Inverter Station MMC is switched back into that determine direct current voltage-controlled by maximum modulation control
System.
5. method for enhancing power during mixed DC rectification side AC fault according to claim 4, it is characterised in that:
The maximum modulation target value B value value range is mnorTo 1, wherein mnorFor specified modulation ratio.
6. method for enhancing power during mixed DC rectification side AC fault according to claim 5, it is characterised in that:
The maximum modulation target value B value value is 1.
7. method for enhancing power during a kind of mixed DC rectification side AC fault, which is characterized in that the rectification side exchange event
Method for enhancing power during barrier the following steps are included:
Step 1: alternating voltage detection module is configured for converting plant LCC, and alternating voltage preset value A value is set, module acquisition
The net side three-phase voltage of converting plant LCC, and calculate the average value U of three phase voltage virtual valuesabc, work as UabcLess than preset value A value
When, alternating voltage detection module exports low AC voltage signal to Inverter Station MMC；
Step 2: configuring maximum modulation module for Inverter Station MMC, and maximum modulation target 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 be enabled,
So that Inverter Station MMC is 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 most
Big modulation ratio module will move out, and Inverter Station MMC switches back into constant DC voltage control by maximum modulation control.
8. method for enhancing power during mixed DC rectification side AC fault according to claim 7, it is characterised in that:
In step 2, after maximum modulation module is enabled, the actual modulated ratio of current Inverter Station MMC is calculated first, then will be worked as
Preceding actual modulated ratio makes the difference with maximum modulation target value, and obtains DC voltage with reference to correction amount by PI controller, this is straight
Stream voltage increment will be superimposed to DC voltage controller, correct direct voltage reference value, so that Inverter Station MMC is by surely straight
The voltage-controlled system of galvanic electricity is converted into maximum modulation control.
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| CN107204626B (en) * | 2017-06-09 | 2021-05-11 | 电子科技大学 | LCC-MMC (lower control center-Modular multilevel converter) staggered hybrid bipolar direct-current power transmission system |
| CN109193736B (en) * | 2018-09-26 | 2021-08-20 | 云南电网有限责任公司电力科学研究院 | STATCOM self-adaptive voltage control method applied to direct current converter station |
| CN114914890A (en) * | 2021-02-08 | 2022-08-16 | 南京南瑞继保电气有限公司 | Voltage source converter direct current side line fault processing method and device |
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| EP2293407A1 (en) * | 2009-09-08 | 2011-03-09 | Converteam Technology Ltd | Power transmission and distribution systems |
| CN103701145B (en) * | 2014-01-02 | 2015-07-08 | 浙江大学 | Mixed MMC-based mixed direct current power transmission system |
| CN105406499B (en) * | 2015-11-20 | 2018-04-20 | 南京南瑞继保电气有限公司 | A kind of intelligent Hybrid HVDC system and fault handling method |
| CN105429164B (en) * | 2015-12-09 | 2018-08-21 | 许继电气股份有限公司 | The sending end low voltage failure traversing method of Hybrid HVDC system |
| CN105790300B (en) * | 2016-03-16 | 2018-07-24 | 国网浙江省电力公司经济技术研究院 | A kind of wind turbine grid-connected system based on Hybrid HVDC |
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