CN110492520A - DC voltage slop control strategy based on inverter capacity and adjustment speed - Google Patents
DC voltage slop control strategy based on inverter capacity and adjustment speed Download PDFInfo
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- CN110492520A CN110492520A CN201910775890.6A CN201910775890A CN110492520A CN 110492520 A CN110492520 A CN 110492520A CN 201910775890 A CN201910775890 A CN 201910775890A CN 110492520 A CN110492520 A CN 110492520A
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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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
-
- 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
- H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
- H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
-
- 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)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a kind of DC voltage slop control strategy based on inverter capacity and adjustment speed, overcome Multi-end flexible direct current transmission system DC voltage fixed slope control strategy is easy to cause the lesser converter station of power margin to enter full load condition in power swing, to lose the defect to DC network power flow changing responding ability.The present invention is corrected Multi-end flexible direct current transmission DC voltage fixed slope coefficient, without change of current interior communication, the lesser converter station of power margin is set to share less imbalance power, the biggish converter station of power margin is set to undertake more imbalance power, the lesser converter station of power margin is avoided due to power swing, cause fully loaded and be switched to determine the generation of power mode, is the DC voltage adaptative slope control strategy based on inverter capacity and adjustment speed.So that the ability of fast and stable DC network power when the multiple converter stations of Multi-end flexible direct current transmission system are with power flow regulating ability and transient state.
Description
Technical field
The present invention relates to a kind of Multi-end flexible direct current transmission multi-point DC voltage control strategies, are suitable for multiterminal flexible direct current
Transmission system.
Background technique
With the development of flexible DC transmission technology, relevant theoretical research constantly improve continuous with equipment manufacturing technology
It improves, the raising of capacity and the continuous extension of voltage class, so that flexible DC transmission, in power distribution network, high-voltage fence, superelevation
Voltage electric grid has obtained extensive engineer application until each field of extra-high voltage grid.Flexible DC transmission is with full-control type semiconductor material
Based on the voltage source converter for expecting insulated gate bipolar transistor (Insulated Gate Bipolar Transistor IGBT)
Body just becomes power planning unit both domestic and external, scientific research institutions, the research emphasis of manufacturer.Compared to traditional Transmission Mode,
D.C. high voltage transmission based on voltage source converter has active and reactive power quick independent control, there is certain dynamic
Reactive power compensation planning improves power quality, powers to passive network, and trend overturning easy to accomplish and building multiterminal flexible direct current are defeated
Electric system (Voltage source converter based Multi-terminal HVDC, VSC-MTDC), identical transmission of electricity
Many advantages, such as corridor conveying capacity is significantly increased.
In Multi-end flexible direct current transmission system, it is necessary to have one end converter station using constant DC voltage control, referred to as based on
Lead converter station, the effect of main stabilization system and balance system power, when there is imbalance power in system, by it is leading stand into
Row power-balance is adjusted；If leading converter station loses the control ability of DC voltage, the tide of entire flexible HVDC transmission system
Stream is by unstability, and therefore, the reliability of single-point DC voltage control strategy is poor；For multi-point DC voltage control, i.e., in direct current
There are multiple converter stations that there is the control ability of DC voltage in transmission system, according to whether needing communication apparatus point between converter station
Class, multi-point DC voltage control are divided into master & slave control and DC voltage error method again；Master & slave control is a kind of to need converter station
Between the control mode that communicates, the stabilization of DC voltage is realized using the communication system between converter station；DC voltage error method
A kind of control mode without change of current interior communication, be determine direct current station failure it is out of service after, DC voltage is determined in standby
Station is able to detect that the relatively large deviation of DC voltage, and is transferred to and determines DC voltage running simulation, guarantees the stabilization of DC voltage；And
DC voltage slop control is the DC voltage control mode to attract attention in recent years, with the more of DC voltage slope controller
Flexible HVDC transmission system is held, each converter station has the P of independent dc power and DC voltagedc-UdcRelation curve, will
The task of stable DC voltage distributes to multiple converter stations, makes to run converter station under this policy along slope independent
Characteristic curve searches new operating point, and to realize Fast-Balance and the distribution of dc power, but this control strategy does not account for
The actual operating mode of converter station, the converter station little for power margin, if removing to undertake the power of fluctuation according to fixed slope
Amount, may result in fully loaded, determine Power operation to be switched to, and lose the ability to the response of DC network power flow changing.
Summary of the invention
The present invention provides a kind of DC voltage slop control strategy based on inverter capacity and adjustment speed, overcomes
Multi-end flexible direct current transmission system DC voltage fixed slope control strategy is easy to cause power margin smaller in power swing
Converter station enter full load condition, to lose the defect to DC network power flow changing responding ability.
The present invention is to solve the above technical problem by the following technical programs:
The present general inventive concept is: the present invention repairs Multi-end flexible direct current transmission DC voltage fixed slope coefficient
Just, it is not necessarily to change of current interior communication, so that the lesser converter station of power margin is shared less imbalance power, keeps power margin larger
Converter station undertake more imbalance power, avoid the lesser converter station of power margin due to power swing, cause to be fully loaded with
And be switched to determine the generation of power mode, it is to be controlled based on inverter capacity and the DC voltage adaptative slope of adjustment speed
Strategy.
A kind of DC voltage slop control strategy based on inverter capacity and adjustment speed, is defeated with four end flexible direct currents
A certain DC voltage adaptative slope control terminal converter station is foundation in electric system, control strategy the following steps are included:
The first step, the rated capacity S for obtaining a certain DC voltage adaptative slope control terminal converter station；
Second step, the DC voltage fixed slope COEFFICIENT K for obtaining a certain DC voltage adaptative slope control terminal converter station；
Third step, with a certain DC voltage adaptative slope control terminal converter station power be 0 when, converter station Capacity Margin is
100%；When using a certain DC voltage adaptative slope control terminal converter station power as rated power, converter station Capacity Margin is
0%, Capacity Margin is divided into ten equal portions η1、η2…η10；Obtain the corresponding adjustment speed v of ten Capacity Margins1、v2…v10；
4th step, the Capacity Margin η based on ten equal portions1、η2…η10Adjustment speed v corresponding with ten Capacity Margins of acquisition1、
v2…v10, fit Capacity Margin function curve f (η)；
5th step obtains a certain DC voltage adaptative slope control terminal converter station actual motion power P；
According to formula:Calculate the Capacity Margin η of converter stationp；
6th step, by Capacity Margin ηpIt is brought into Capacity Margin function curve f (η), obtains Capacity Margin ηpCapacity Margin
Function curve f (ηp), and utilize formula: K*=f (ηp) × K controls a certain DC voltage adaptative slope that second step obtains
The DC voltage fixed slope COEFFICIENT K of end converter station is modified, and obtains a certain DC voltage adaptative slope control terminal change of current
The correction value K for the DC voltage fixed slope COEFFICIENT K stood*And the minimum correction value K of K*minWith the maximum modified value K of K*max,
And DC voltage adaptative slope controller is constituted with this.
A certain DC voltage adaptative slope control terminal converter station DC voltage fixed slope controls slope value K, be according to
What following formula was calculated:
In formula: be guarantee DC voltage slope curve within the limiting value of voltage fluctuation, it is desirable that 0 β≤1 <, take here β=
0.75；
UdcmaxFor DC voltage maximum permissible value；
UdcrefFor DC voltage control reference value；
S is the rated capacity of a certain DC voltage adaptative slope control terminal converter station.
The present invention utilizes DC voltage adaptative slope control strategy, so that the Multi-end flexible direct current transmission system is multiple
The ability of fast and stable DC network power when converter station is with power flow regulating ability and transient state.
Detailed description of the invention
Fig. 1 is the flow chart of DC voltage adaptative slope control strategy of the invention；
Fig. 2 is four end DC transmission systems used by control strategy of the invention, wherein S1、S2Both ends run on DC voltage
The structural schematic diagram of adaptative slope control；
Fig. 3 is the structural schematic diagram of DC voltage adaptative slope controller of the invention；
Fig. 4 is the analogous diagram of the static Simulation 1 in the embodiment of the present invention；
Fig. 5 is the analogous diagram of static Simulation 2 in the embodiment of the present invention；
Fig. 6 is the analogous diagram of static Simulation 3 in the embodiment of the present invention；
Fig. 7 is DC side fault simulation figure in the embodiment of the present invention.
Specific embodiment
A kind of DC voltage slop control strategy based on inverter capacity and adjustment speed, is defeated with four end flexible direct currents
A certain DC voltage adaptative slope control terminal converter station is foundation in electric system, control strategy the following steps are included:
The first step, the rated capacity S for obtaining a certain DC voltage adaptative slope control terminal converter station；
Second step, the DC voltage fixed slope COEFFICIENT K for obtaining a certain DC voltage adaptative slope control terminal converter station；
Third step, with a certain DC voltage adaptative slope control terminal converter station power be 0 when, converter station Capacity Margin is
100%；When using a certain DC voltage adaptative slope control terminal converter station power as rated power, converter station Capacity Margin is
0%, Capacity Margin is divided into ten equal portions η1、η2…η10；Obtain the corresponding adjustment speed v of ten Capacity Margins1、v2…v10；
4th step, the Capacity Margin η based on ten equal portions1、η2…η10Adjustment speed v corresponding with ten Capacity Margins of acquisition1、
v2…v10, fit Capacity Margin function curve f (η)；
5th step obtains a certain DC voltage adaptative slope control terminal converter station actual motion power P；
According to formula:Calculate the Capacity Margin η of converter stationp；
6th step, by Capacity Margin ηpIt is brought into Capacity Margin function curve f (η), obtains Capacity Margin ηpCapacity Margin
Function curve f (ηp), and utilize formula: K*=f (ηp) × K controls a certain DC voltage adaptative slope that second step obtains
The DC voltage fixed slope COEFFICIENT K of end converter station is modified, and obtains a certain DC voltage adaptative slope control terminal change of current
The correction value K for the DC voltage fixed slope COEFFICIENT K stood*And the minimum correction value K of K*minWith the maximum modified value K of K*max,
And DC voltage adaptative slope controller is constituted with this.
A certain DC voltage adaptative slope control terminal converter station DC voltage fixed slope controls slope value K, be according to
What following formula was calculated:
In formula: be guarantee DC voltage slope curve within the limiting value of voltage fluctuation, it is desirable that 0 β≤1 <, take here β=
0.75；
UdcmaxFor DC voltage maximum permissible value；
UdcrefFor DC voltage control reference value；
S is the rated capacity of a certain DC voltage adaptative slope control terminal converter station.
Four end flexible DC transmission analogue system basic parameter tables of the invention:
Converter station DC voltage fixed slope of the invention controls slope value K calculating parameter table:
| DC power supply maximum fluctuation value | β |
| ± 7.5% | 0.75 |
；
Of the invention fits parameter of curve table based on Capacity Margin and adjustment speed:
| Power margin η/% | 90 | 80 | 70 | 60 | 50 | 40 | 30 | 20 | 10 |
| Adjustment speed v | 10 | 10 | 5 | 2.5 | 2 | 1.667 | 1.25 | 1 | 1 |
；
It is fitted obtained functional relation are as follows: f (η)=0.2922 η2-1.4422η+1.1619。
Above drawings that need to be used in the embodiment or the prior art description is made simply to introduce, it is clear that
For those of ordinary skill in the art, wound is not being paid wherein the attached drawing in description is only the embodiment of the present invention in ground
Under the premise of the property made is worked, other attached drawings can also be obtained without creative work according to the attached drawing of offer.
Claims (2)
1. a kind of DC voltage slop control strategy based on inverter capacity and adjustment speed, is with four end flexible DC transmissions
A certain DC voltage adaptative slope control terminal converter station is foundation in system, control strategy the following steps are included:
The first step, the rated capacity S for obtaining a certain DC voltage adaptative slope control terminal converter station；
Second step, the DC voltage fixed slope COEFFICIENT K for obtaining a certain DC voltage adaptative slope control terminal converter station；
Third step, with a certain DC voltage adaptative slope control terminal converter station power be 0 when, converter station Capacity Margin is
100%；When using a certain DC voltage adaptative slope control terminal converter station power as rated power, converter station Capacity Margin is
0%, Capacity Margin is divided into ten equal portions η1、η2…η10；Obtain the corresponding adjustment speed v of ten Capacity Margins1、v2…v10；
4th step, the Capacity Margin η based on ten equal portions1、η2…η10Adjustment speed v corresponding with ten Capacity Margins of acquisition1、
v2…v10, fit Capacity Margin function curve f (η)；
5th step obtains a certain DC voltage adaptative slope control terminal converter station actual motion power P；According to formula:Calculate the Capacity Margin η of converter stationp；
6th step, by Capacity Margin ηpIt is brought into Capacity Margin function curve f (η), obtains Capacity Margin ηpCapacity Margin letter
Number curve f (ηp), and utilize formula: K*=f (ηp) × K, a certain DC voltage adaptative slope control terminal that second step is obtained
The DC voltage fixed slope COEFFICIENT K of converter station is modified, and obtains a certain DC voltage adaptative slope control terminal converter station
DC voltage fixed slope COEFFICIENT K correction value K* and K minimum correction value K*minWith the maximum modified value K of K*max, and
DC voltage adaptative slope controller is constituted with this.
2. a kind of DC voltage slop control strategy based on inverter capacity and adjustment speed according to claim 1,
It is characterized in that, a certain DC voltage adaptative slope control terminal converter station DC voltage fixed slope controls slope value K, be by
It is calculated according to following formula:
In formula: be guarantee DC voltage slope curve within the limiting value of voltage fluctuation, it is desirable that 0 β≤1 <, take here β=
0.75；
UdcmaxFor DC voltage maximum permissible value；
UdcrefFor DC voltage control reference value；
S is the rated capacity of a certain DC voltage adaptative slope control terminal converter station.
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| CN201910775890.6A CN110492520B (en) | 2019-08-21 | 2019-08-21 | DC voltage slope control strategy based on converter capacity and regulation speed |
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| CN201910775890.6A CN110492520B (en) | 2019-08-21 | 2019-08-21 | DC voltage slope control strategy based on converter capacity and regulation speed |
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| CN110492520B (en) | 2023-05-26 |
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