CN108616137A - It is a kind of to realize that ac and dc systems coordinate the direct current control restored and protect parameter optimization method - Google Patents
It is a kind of to realize that ac and dc systems coordinate the direct current control restored and protect parameter optimization method Download PDFInfo
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- CN108616137A CN108616137A CN201810437060.8A CN201810437060A CN108616137A CN 108616137 A CN108616137 A CN 108616137A CN 201810437060 A CN201810437060 A CN 201810437060A CN 108616137 A CN108616137 A CN 108616137A
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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
- H02J5/00—Circuit arrangements for transfer of electric power between ac networks and dc networks
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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
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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
It realizing that ac and dc systems coordinate the direct current control restored and protect parameter optimization method the invention discloses a kind of, belongs to power system and automation technology.The method of the invention includes step：Calculate current conversion station effective short-circuit ratio in DC inversion side under the current method of operation, ac and dc systems Dynamic- Recovery capacity index under failure is calculated in real time according to inverter side current conversion station busbar voltage in direct current effectively short circuit when transient process, according to the index, dynamic calculates direct-current commutation failure PREDICTIVE CONTROL and current limiting low-voltage link key parameter.The present invention fully considers that AC system intensity and failure impact the influence to alternating current-direct current recovery capability, and parameter regulation amplitude limit is protected in setting direct current control, in the case of ensureing that direct current own control systems are stablized, improves ac and dc systems and coordinates recovery capability.
Description
Technical field
It realizing that ac and dc systems coordinate the direct current control restored and protect parameter optimization method the present invention relates to a kind of, belongs to electric power certainly
Dynamicization technical field.
Background technology
As large capacity extra-high voltage direct-current gradually puts into operation, power grid " tetanic weak friendship " characteristic is increasingly prominent, and AC-DC coupling is made
With increasingly closely.Multiple power grids such as China's East China Power Grid, Central China Power Grid, Guangdong Power Grid have been respectively formed the typical case of direct current feed-in at present
System.The problems such as direct-current commutation failure, has become an important factor for restricting extra-high voltage alternating current-direct current power network safety operation.
There are larger reactive power exchanges with AC system in direct-current commutation failure and recovery process.AC system it is weaker or
When failure impact is larger, if direct current restores too fast, a large amount of reactive powers can be absorbed from AC system, AC system may be caused electric
Pressure restores slower, or even causes receiving end Voltage Instability, and ac and dc systems can not restore；If but direct current resume speed is excessively slow, meeting
Larger power rush is caused to AC system, may cause AC system generator rotor angle, frequency security risk.Therefore, in alternating current-direct current
In interacted system, it is necessary to control direct current resume speed, improve ac and dc systems and coordinate recovery capability.
Invention content
It is an object of the invention to overcome deficiency in the prior art, provide it is a kind of realize ac and dc systems coordinate restore
Parameter optimization method is protected in direct current control, solve in the prior art after direct-current commutation failure direct current resume speed be difficult to control cause to hand over it is straight
Streaming system coordinates the technical problem of recovery capability difference.
In order to solve the above technical problems, the technical solution adopted in the present invention is：A kind of realization ac and dc systems coordination is extensive
Parameter optimization method is protected in multiple direct current control, is included the following steps：
Calculate current conversion station effective short-circuit ratio in DC inversion side under the current method of operation；
Alternating current-direct current system under failure is calculated in real time according to inverter side current conversion station busbar voltage in effective short circuit when transient process
System Dynamic- Recovery capacity index；
According to Dynamic- Recovery capacity index, dynamic regulation direct-current commutation failure PREDICTIVE CONTROL and current limiting low-voltage link parameter.
Further, effective short-circuit ratio is calculated according to formula (1)：
In formula, MESCRiFor the effective short-circuit ratio of direct current i inverter side current conversion stations, SaciHold for direct current i inverter side current conversion station short circuits
Amount, QciFor direct current i inverter side filter compensation capacity；PdiFor direct current i inverter side output powers.
Further, Dynamic- Recovery capacity index is calculated according to formula (2)：
RFi=MESCRi*UFi (2)
In formula, RFiFor direct current i and its inverter side current conversion station bus-bar voltage coordination recovery capability index；UFiIt is straight under failure
Flow the real-time busbar voltage of i inverter side current conversion stations.
Further, the method for dynamic regulation direct-current commutation failure PREDICTIVE CONTROL parameter is as follows：
Determine the Critical Standard R of ac and dc systems Dynamic- Recovery ability powerFlim；
Startup voltage value is controlled according to formula (3) to commutation failure prediction to optimize：
In formula, Ucfp1Commutation failure PREDICTIVE CONTROL starts voltage calculated value, R when not consider amplitude limitFiIt is inverse with it for direct current i
Become side current conversion station bus-bar voltage coordination recovery capability index；UcfprStart voltage for commutation failure PREDICTIVE CONTROL link and calculates reference
Value；
Consider amplitude limit demand, commutation failure prediction is controlled and starts voltage by formula (4) value：
Ucfp=min [Ucfp1,0.85] (4)。
Further, the method for dynamic regulation current limiting low-voltage link parameter is as follows：
Determine the Critical Standard R of ac and dc systems Dynamic- Recovery ability powerFlim；
It is optimized according to formula (5), (6) to starting voltage and blanking voltage：
In formula：Udh1Current limiting low-voltage link starts voltage calculated value when not consider amplitude limit；Udl1For when not considering amplitude limit
Current limiting low-voltage link blanking voltage calculated value；UdhrStart voltage for current limiting low-voltage link and calculates reference value；UdlrFor current limiting low-voltage
Link blanking voltage calculates reference value；RFiFor direct current i and its inverter side current conversion station bus-bar voltage coordination recovery capability index；
Consider amplitude limit demand, Udh、UdlFormula (7), (8) value are pressed respectively：
In formula：UdhTo start voltage；UdlFor blanking voltage.
Further, the Critical Standard R of ac and dc systems Dynamic- Recovery ability powerFlimIt calculates and obtains by formula (3)：
RFlim=MESCRlim*Ucr (9)
In formula, MESCRiFor the effective short-circuit ratio of direct current i inverter side current conversion stations；Ucr is that AC system Transient Voltage Stability faces
Dividing value.
Compared with prior art, the advantageous effect of the invention reached is：
Fully consider that AC system intensity and failure impact the influence to alternating current-direct current recovery capability, parameter is protected in setting direct current control
Amplitude limit is adjusted, in the case of ensureing that direct current own control systems are stablized, ac and dc systems is improved and coordinates recovery capability, be extra-high voltage
The control of alternating current-direct current power network safety operation provides technical support.
Description of the drawings
Fig. 1 is the flow chart of the method for the present invention.
Specific implementation mode
Commutation failure PREDICTIVE CONTROL and current limiting low-voltage control are closely related with direct-current commutation failure two during direct current control is protected
A link has larger impact to direct current resume speed and ac and dc systems reactive power exchange.The present invention proposes a kind of realization alternating current-direct current
Parameter optimization method is protected in the direct current control that system coordination restores, and fully considers that AC system intensity and failure impact restore alternating current-direct current
Parameter regulation amplitude limit is protected in the influence of ability, setting direct current control, and in the case of ensureing that direct current own control systems are stablized, raising is handed over straight
Streaming system coordinates recovery capability.
The invention will be further described below in conjunction with the accompanying drawings.Following embodiment is only used for clearly illustrating the present invention
Technical solution, and not intended to limit the protection scope of the present invention.
As shown in Figure 1, the present invention provides a kind of direct current control guarantor's parameter optimization method realized ac and dc systems and coordinate recovery,
Include the following steps：
Step 1：It according to formula (1), calculates under the current method of operation, the effective short-circuit ratio of direct current i inverter side current conversion stations：
In formula, MESCRiFor the effective short-circuit ratio of direct current i inverter side current conversion stations, SaciHold for direct current i inverter side current conversion station short circuits
Amount, QciFor direct current i inverter side filter compensation capacity；PdiFor direct current i inverter side output powers.
Step 2：Ac and dc systems Dynamic- Recovery capacity index under failure is calculated according to formula (2)：
RFi=MESCRi*UFi (2)
In formula, RFiFor direct current i and its inverter side current conversion station bus-bar voltage coordination recovery capability index；UFiIt is straight under failure
Flow the real-time busbar voltage of i inverter side current conversion stations.
Step 3：Dynamic calculates direct-current commutation failure PREDICTIVE CONTROL and current limiting low-voltage link parameter：
3-1) determine ac and dc systems Dynamic- Recovery ability power standard：
According to engineering experience, when effective short-circuit ratio is more than critical value MESCRlimWhen (general value 3.0 in engineering), it can recognize
For strong system；Basis simultaneously《Power system security stability Calculation technical specification》Transient Voltage Stability criterion, electric system by
In dynamic process after to disturbance, load busbar voltage is restored to 0.8 per unit value or more in 10s, and Ucr can be by 0.8 value.Cause
The Critical Standard R of this ac and dc systems Dynamic- Recovery ability powerFlimIt can be calculated by formula (3)：
RFlim=3.0*0.8=2.4 (3)
3-2) determine commutation failure PREDICTIVE CONTROL parameter regulation means：
According to commutation failure PREDICTIVE CONTROL link action principle, which starts voltage value UcfpIt is to influence alternating current-direct current to restore
One of key parameter of characteristic.Therefore, startup voltage value is controlled to commutation failure prediction according to formula (4) to optimize：
In formula, Ucfp1Start voltage calculated value, U for commutation failure PREDICTIVE CONTROLcfprIt is opened for commutation failure PREDICTIVE CONTROL link
Dynamic voltage reference value.According to engineering experience, which starts voltage and is typically in the range of 0.75p.u.~0.85p.u., i.e. ac bus
Voltage Drop to link when 0.75p.u.~0.85p.u. starts, then UcfprIt can value 0.85p.u..
According to engineering experience, commutation failure PREDICTIVE CONTROL link startup voltage is higher, is needed in direct current recovery process from friendship
Streaming system absorbs more reactive powers, is unfavorable for AC system recovery, and general recommendations value is no more than 0.85p.u..Therefore,
Commutation failure PREDICTIVE CONTROL starts voltage value can be by formula (5) value：
Ucfp=min [Ucfp1,0.85] (5)
3-3) determine current limiting low-voltage link parameter regulation means：
According to the action principle of current limiting low-voltage link, which starts voltage UdhWith blanking voltage UdlIt is to influence direct current
Flow the important parameter of recovery process.Therefore, it is optimized according to formula (6), (7) to starting voltage and blanking voltage：
According to current limiting low-voltage control principle, Udh>Udl；Simultaneously according to engineering experience, starts the general value of voltage and be not higher than
0.85p.u., the general value of blanking voltage is not less than 0.1p.u., while considering certain nargin, to Udh、UdlCarry out amplitude limit, Udh、
UdlIt can value as the following formula：
In formula：Udh1Current limiting low-voltage link starts voltage calculated value when not consider amplitude limit；Udl1For when not considering amplitude limit
Current limiting low-voltage link blanking voltage calculated value；UdhrStart voltage for current limiting low-voltage link and calculates reference value；UdlrFor current limiting low-voltage
Link blanking voltage calculates reference value；UdhStart voltage for current limiting low-voltage link；UdlFor current limiting low-voltage link blanking voltage.
In conclusion the present invention is a kind of direct current control guarantor's parameter optimization method realized ac and dc systems and coordinate recovery.It fills
The influence for considering that AC system intensity and failure are impacted to alternating current-direct current recovery capability, setting direct current control is divided to protect parameter regulation amplitude limit,
It in the case of ensureing that direct current own control systems are stablized, improves ac and dc systems and coordinates recovery capability, be extra-high voltage alternating current-direct current electricity
The control of net safe and stable operation provides technical support.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvement and deformations can also be made, these improvement and deformations
Also it should be regarded as protection scope of the present invention.
Claims (6)
1. a kind of realizing that ac and dc systems coordinate the direct current control restored and protect parameter optimization method, which is characterized in that including walking as follows
Suddenly：
Calculate current conversion station effective short-circuit ratio in DC inversion side under the current method of operation；
It is dynamic that ac and dc systems under failure are calculated in real time according to inverter side current conversion station busbar voltage in effective short circuit when transient process
State recovery capability index；
According to Dynamic- Recovery capacity index, dynamic regulation direct-current commutation failure PREDICTIVE CONTROL and current limiting low-voltage link parameter.
2. according to claim 1 realize that ac and dc systems coordinate the direct current control restored and protect parameter optimization method, feature
It is, effective short-circuit ratio is calculated according to formula (1)：
In formula, MESCRiFor the effective short-circuit ratio of direct current i inverter side current conversion stations, SaciFor direct current i inverter side current conversion station capacities of short circuit,
QciFor direct current i inverter side filter compensation capacity；PdiFor direct current i inverter side output powers.
3. according to claim 2 realize that ac and dc systems coordinate the direct current control restored and protect parameter optimization method, feature
It is, Dynamic- Recovery capacity index is calculated according to formula (2)：
RFi=MESCRi*UFi (2)
In formula, RFiFor direct current i and its inverter side current conversion station bus-bar voltage coordination recovery capability index；UFiIt is inverse for direct current i under failure
Become the real-time busbar voltage of side current conversion station.
4. according to claim 1 realize that ac and dc systems coordinate the direct current control restored and protect parameter optimization method, feature
It is, the method for dynamic regulation direct-current commutation failure PREDICTIVE CONTROL parameter is as follows：
Determine the Critical Standard R of ac and dc systems Dynamic- Recovery ability powerFlim；
Startup voltage value is controlled according to formula (3) to commutation failure prediction to optimize：
In formula, Ucfp1Commutation failure PREDICTIVE CONTROL starts voltage calculated value, R when not consider amplitude limitFiFor direct current i and its inverter side
Current conversion station bus-bar voltage coordination recovery capability index；UcfprStart voltage for commutation failure PREDICTIVE CONTROL link and calculates reference value；
According to engineering experience, commutation failure prediction is controlled and starts voltage by formula (4) value：
Ucfp=min [Ucfp1,0.85] (4)。
5. according to claim 1 realize that ac and dc systems coordinate the direct current control restored and protect parameter optimization method, feature
It is, the method for dynamic regulation current limiting low-voltage link parameter is as follows：
Determine the Critical Standard R of ac and dc systems Dynamic- Recovery ability powerFlim；
It is optimized according to formula (5), (6) to starting voltage and blanking voltage：
In formula：Udh1Current limiting low-voltage link starts voltage calculated value when not consider amplitude limit；Udl1For the low pressure for not considering when amplitude limit
Current limit link blanking voltage calculated value；UdhrStart voltage for current limiting low-voltage link and calculates reference value；UdlrFor current limiting low-voltage link
Blanking voltage calculates reference value；RFiFor direct current i and its inverter side current conversion station bus-bar voltage coordination recovery capability index；
Consider that amplitude limit demand, current limiting low-voltage link start voltage and blanking voltage and press formula (7), (8) value respectively：
In formula：UdhStart voltage for current limiting low-voltage link；UdlFor current limiting low-voltage link blanking voltage.
6. according to claim 4 or 5 realize that ac and dc systems coordinate the direct current control restored and protect parameter optimization method, special
Sign is, the Critical Standard R of ac and dc systems Dynamic- Recovery ability powerFlimIt calculates and obtains by formula (3)：
RFlim=MESCRlim*Ucr (9)
In formula, MESCRiFor the effective short-circuit ratio of direct current i inverter side current conversion stations；Ucr is AC system Transient Voltage Stability critical value.
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| CN112668946A (en) * | 2021-01-28 | 2021-04-16 | 广西大学 | VSC-HVDC (Voltage Source converter-high Voltage direct Current) access power system unit recovery sequence decision method |
| CN113890078A (en) * | 2021-08-26 | 2022-01-04 | 国家电网公司西南分部 | VDCOL parameter optimization-based multi-direct-current coordination recovery method |
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| CN113890078B (en) * | 2021-08-26 | 2022-10-21 | 国家电网公司西南分部 | VDCOL parameter optimization-based multi-direct-current coordination recovery method |
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