CN107069757A - One kind mixing multi-infeed HVDC system secondary voltage control method - Google Patents
One kind mixing multi-infeed HVDC system secondary voltage control method Download PDFInfo
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- CN107069757A CN107069757A CN201710456452.4A CN201710456452A CN107069757A CN 107069757 A CN107069757 A CN 107069757A CN 201710456452 A CN201710456452 A CN 201710456452A CN 107069757 A CN107069757 A CN 107069757A
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
-
- 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)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
Multi-infeed HVDC system secondary voltage control method is mixed the invention discloses one kind, passes through the selected backbone point bus set for participating in secondary voltage control；According to the power flow equation of the whole network, sensitivity matrix of the backbone point busbar voltage on reactive power is obtained, and secondary voltage control model is set up according to sensitivity matrix；Secondary voltage control model is solved, each controlled synchronous generator and HVDC converter substation and the Reactive-power control amount of other backbone points is tried to achieve, secondary voltage control is carried out accordingly.The secondary voltage of on-line coordination control mixing multi-infeed HVDC system can be realized.
Description
Technical field
The present invention relates to field of power system control, more particularly to a kind of mixing multi-infeed HVDC system secondary voltage control
Method.
Background technology
Tertiary voltage control pattern is the learning algorithms pattern generally used in the world, big in France, meaning
The countries such as profit, Spain, Belgium and Brazil put into practice, and most domestic saves net and also put into operation, and achieve preferably
Effect.In such a mode, the main target of wherein secondary voltage control is to be reset with certain coordination strategy one in region
The setting value of each automatic voltage regulator of step voltage key-course, makes the magnitude of voltage of backbone point deviate tertiary voltage control layer setting
Backbone point voltage reference value within the acceptable range.Secondary voltage control is the crucial ring for connecting other two levels
Section, it can from the stable angle of region voltage, rationally, in phase within distribution local area each Voltage-Reactive Power source it is idle
Power, can improve the voltage level in region and improve the voltage stability of system to a certain extent.
With the progressively in-depth continued to develop with power system reform of power network, the competition of Power Market, which is cured, to be drilled more
Strong, in order to improve economy, more and more operation of power networks states are close or reached the operational limit of system, and voltage is steady
Determine problem to become increasingly conspicuous.Especially under the overall background that China transfers electricity from the west to the east, substantial amounts of power passes through remote AC/DC power transmission line
Road feed-in load center, forms typical multi-infeed HVDC system.Relative to simple AC system, multi-infeed HVDC receiving end
The voltage stabilization sex chromosome mosaicism of AC system is more protruded, and is mainly manifested in idle resource variation, and control device is complicated, many numerical controls
Control equipment relies solely on information on the spot and is controlled, and causes the voltage power-less on-line coordination control for realizing receiving end AC system
There are many difficulties.The particularly mixing multi-infeed HVDC system of the feed-in containing VSC-HVDC and LCC-HVDC, reactive source is more multiple
It is miscellaneous, how the reactive source of system is carried out it is rational coordinate with distribution, be that mixing multi-infeed HVDC system keeps voltage stabilization
It is crucial.
The content of the invention
The present invention is in order to solve the above problems, it is proposed that one kind mixing multi-infeed HVDC system secondary voltage control method,
The present invention can on-line coordination control mixing multi-infeed HVDC system secondary voltage.
To achieve these goals, the present invention is adopted the following technical scheme that：
One kind mixing multi-infeed HVDC system secondary voltage control method, comprises the following steps：
(1) the backbone point bus set for participating in secondary voltage control is selected；
(2) according to the power flow equation of the whole network, sensitivity matrix of the backbone point busbar voltage on reactive power, and root are obtained
Secondary voltage control model is set up according to sensitivity matrix；
(3) secondary voltage control model is solved, try to achieve each controlled synchronous generator and HVDC converter substation and
The Reactive-power control amount of other backbone points, carries out secondary voltage control accordingly.
In the step (1), it is determined that participating in the on high-tension side bus of generator of secondary voltage control, high voltage direct current converter is female
Line and the load-center substation bus of other participation secondary voltage controls are used as mixing multi-infeed HVDC system secondary voltage control
Maincenter bus set.
In the step (2), the acquisition methods of sensitivity matrix are：The power flow equation of AC system is calculated, if mother
Be present VSC-HVDC feed-ins or LCC-HVDC feed-ins in line, the Jacobian matrix of system is corrected accordingly, after amendment
Power flow equation try to achieve the sensitivity equation of multi-infeed HVDC system.
Further, in the step (2), when bus i has LCC-HVDC feed-ins, then according to the i-th feedback LCC-HVDC feedbacks
The active power and reactive power for entering AC system are repaiied to the partial derivative of change of current bus i voltage magnitudes to its Jacobian matrix
Just.
Further, in the step (2), when bus k has VSC-HVDC feed-ins, then kth feedback VSC-HVDC feed-ins are handed over
Streaming system active power and reactive power are entered to the partial derivative of change of current bus k voltage phase angles and voltage magnitude to its Jacobian matrix
Row amendment.
In the step (2), the construction method of secondary voltage control model is：According to the sensitivity matrix of acquisition, with reference to
The voltage actual value of the backbone point of collection, and tertiary voltage control issue the voltage reference value of backbone point, set up with all
The multi-infeed HVDC system secondary voltage control model of the minimum target of quadratic sum of centring point voltage deviation setting value.
In the step (2), multi-infeed HVDC system secondary voltage control model using voltage sensibility equation as equation about
Beam condition, inequality constraints condition is limited to so that the reactive power of reactive source is adjustable up and down.
Further, inequality constraints condition also include the idle adjustable bounds of VSC-HVDC, LCC-HVDC current conversion stations and
Reactive power compensator bound in other backbone points.
In the step (3), secondary voltage control model is solved using quadratic programming, each controlled synchronous is tried to achieve
The Reactive-power control amount of generator and HVDC converter substation and other backbone points.
In the step (3), for generator, idle control strategy is issued in the form of generator reactive adjustment amount, is entered
And generator reactive adjustment amount is converted into the voltage reference value adjustment amount of generator generator terminal, field regulator parameter is changed, with
Realize voltage control.
In the step (3), for VSC-HVDC current conversion stations, idle control strategy is issued in the form of idle adjustment amount
VSC-HVDC current conversion station straight-flow system key-courses, carry out transverter injecting power control.
In the step (3), for LCC-HVDC current conversion stations, idle control strategy is issued in the form of idle adjustment amount
LCC-HVDC change of current station controls, change of current station control issues instruction and carries out reactive-load compensation control to reactive compensator controller
System.
Compared with prior art, beneficial effects of the present invention are：
(1) present invention has specific aim, and details is carried out for generator, VSC-HVDC current conversion stations and LCC-HVDC current conversion stations
Adjustment idle control strategy, it is applied widely and for every kind of different applicable situation all targetedly details adjust,
Fully meet its requirement；
(2) it may be implemented in the secondary voltage of signal coordination control mixing multi-infeed HVDC system.
Brief description of the drawings
The Figure of description for constituting the part of the application is used for providing further understanding of the present application, and the application's shows
Meaning property embodiment and its illustrate be used for explain the application, do not constitute the improper restriction to the application.
Fig. 1 is step flow chart of the invention；
Fig. 2 is iterative process figure of the invention；
Fig. 3 is the configuration of power network of embodiments of the invention one；
Fig. 4 is each backbone point Reactive-power control spirogram that embodiments of the invention one are calculated；
Fig. 5 is the dynamic simulation figure of embodiments of the invention one；
Fig. 6 is voltage distribution graph before and after the event of embodiments of the invention one.
Embodiment：
The invention will be further described with embodiment below in conjunction with the accompanying drawings.
It is noted that described further below is all exemplary, it is intended to provide further instruction to the application.Unless another
Indicate, all technologies used herein and scientific terminology are with usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singulative
It is also intended to include plural form, additionally, it should be understood that, when in this manual using term "comprising" and/or " bag
Include " when, it indicates existing characteristics, step, operation, device, component and/or combinations thereof.
In a kind of typical embodiment of the application, as shown in figure 1, Fig. 1, one kind two grades of multi-infeed HVDC system of mixing
Voltage control method, this method comprises the following steps：
A：Analysis determines to participate in the maincenter bus set of secondary voltage control；
B：According to the power flow equation of the whole network, sensitivity matrix of the backbone point busbar voltage on reactive power, and root are obtained
The secondary voltage control model of mixing multi-infeed HVDC system is set up according to sensitivity matrix；
C：Secondary voltage control model is solved using quadratic programming, each controlled synchronous generator and high pressure is tried to achieve
The Reactive-power control amount of DC converter station and other backbone points；
D：According to the Reactive-power control amount of each controlled synchronous generator and HVDC converter substation and other backbone points, two are carried out
Step voltage is controlled.
It is further used as preferred embodiment, the step A, it includes：The selected generating for participating in secondary voltage control
The on high-tension side bus of machine, high voltage direct current converter bus and other load-center substation buses for participating in secondary voltage control are presented more as
Enter the maincenter bus set of straight-flow system secondary voltage control.
It is further used as preferred embodiment, the step B, it comprises the following steps：
B1：According to the power flow equation of the whole network, sensitivity matrix of the backbone point busbar voltage on reactive power is obtained；
B2：The secondary voltage control model of mixing multi-infeed HVDC system is set up according to sensitivity matrix.
It is further used as preferred embodiment, the step B1, it comprises the following steps：
B11：For pure AC system, the amendment form of computing system power flow equation is
In formula, Δ Pac, Δ QacThe respectively active and idle correction matrix of ac bus；JPδ, JPU, JQδ, JQUIt is respectively refined
Gram than matrix corresponding sub-block matrix；Δ δ is ac bus phase angle correction matrix；Δ U is ac bus voltage magnitude amendment square
Battle array.
B12：If bus i has a LCC-HVDC feed-ins, system Jacobian matrix respective element is modified to
Wherein
In formula, (JPU)i,i(JQU)i,iRespectively Jacobi submatrix JPUAnd JQUI-th row, the i-th column element；WithThe active power of respectively i-th feedback direct current feed-in AC system and local derviation of the reactive power to change of current bus i voltage magnitudes
Number.
B13：If bus k has a VSC-HVDC feed-ins, system Jacobian matrix respective element is modified to
Wherein
In formula,WithRespectively kth presents VSC-HVDC feed-in AC system active power and nothing
Work(power is to change of current bus k voltage phase angles and the partial derivative of voltage magnitude.
B14：Δ P=0 is made, Δ Q=J' is releasedRΔ V, and then the sensitivity equation of multi-infeed HVDC system can be tried to achieve be
In formula, matrix
It is further used as preferred embodiment, the step B2, it includes：
The voltage of the backbone point gathered according to the sensitivity matrix of acquisition, data acquisition with supervisor control (SCADA)
Actual value, and tertiary voltage control issue the voltage reference value of backbone point, set up with all backbone point voltage deviation setting values
The minimum target of quadratic sum, voltage sensibility equation is equality constraint, and the reactive power of reactive source is adjustable to be limited to up and down
The multi-infeed HVDC system secondary voltage control model of formula constraint：
In formula, n is the nodes of backbone point bus in region；Vi(t)、Vi,ref(t) it is respectively electricity of the bus i in t
The tertiary voltage management configuration value of pressure amplitude value and maincenter bus i.Equality constraint is voltage sensibility equation, and inequality constraints is successively
For the adjustable bound of generator reactive, adjustable bound that VSC-HVDC is idle, nothing in LCC-HVDC current conversion stations and other backbone points
Reactive power compensation installations bound.
It is further used as preferred embodiment, the step C, it is included using quadratic programming to secondary voltage control
Model is solved, and tries to achieve each controlled synchronous generator and HVDC converter substation and the Reactive-power control amount of other backbone points.
It is further used as preferred embodiment, the step D, it includes：For generator, idle control strategy is to send out
The form of motor is idle adjustment amount is issued to automatism voltage control (AVC) substation, and AVC substations convert generator reactive adjustment amount
For the voltage reference value adjustment amount of generator generator terminal, field regulator parameter is changed, to realize voltage control；For VSC-HVDC
Current conversion station, idle control strategy is issued to VSC-HVDC current conversion station straight-flow system key-courses in the form of idle adjustment amount, carries out
Transverter injecting power is controlled；For LCC-HVDC current conversion stations, idle control strategy is issued in the form of idle adjustment amount
LCC-HVDC change of current station controls, change of current station control issues instruction and carries out reactive-load compensation control to reactive compensator controller
System.
Embodiment one
The present embodiment is exemplified by mixing double-fed direct current example system, and the process that implements to the present invention is carried out furtherly
It is bright.Mixing double-fed straight-flow system contains 1 time LCC-HVDC and 1 time VSC-HVDC and 2 synchronous generator.Detailed topology please join
According to Fig. 3.The process that implements of the present embodiment includes：
1) power network topology information, including network structure and power plant, DC converter station information are obtained, region maincenter is determined
Point set C.
As shown in figure 3, the present embodiment chooses each direct current feed-in change of current bus, generator high-voltage side bus are backbone point：
C={ node 1, node 2, node 3, node 4 }
2) according to the power flow equation of the whole network, sensitivity matrix of the backbone point busbar voltage on reactive power, and root are obtained
The secondary voltage control model of mixing multi-infeed HVDC system is set up according to sensitivity matrix.
3) secondary voltage control model is solved using quadratic programming, tries to achieve each controlled synchronous generator and high pressure
The Reactive-power control amount of DC converter station and other backbone points, as shown in Figure 4.
4) according to the Reactive-power control amount of each controlled synchronous generator and HVDC converter substation and other backbone points, two are carried out
Step voltage is controlled.
5) dynamic simulation checking is carried out using electromagnetic transient simulation software PSCAD/EMTDC, as shown in Figure 5, Figure 6.
Process simulation is carried out using PSCAD/EMTDC programs, secondary voltage control process is as shown in Figure 5.System was at 41 seconds
When, load or burden without work increases suddenly, and as shown in table 1, system voltage was by 2 seconds transient processes, 43 for the load incrementss of each node
Tended towards stability during the second, each node voltage reduction of system.System detectio deviates after setting value to backbone point actual voltage value, starts two
Step voltage control algolithm, the reactive-load compensation amount for obtaining each backbone point is as shown in Figure 4.Reactive-load compensation is issued according to reactive-load compensation amount to refer to
Order, at 50 seconds, each backbone point was compensated according to the instruction issued, by the transient process of about 2 seconds, and system tends towards stability,
The voltage of each node returns to reasonable level.Two grades of electricity of voltage's distribiuting and implementation after each node primary voltage distribution, load growth
Voltage's distribiuting is as shown in Figure 6 after voltage-controlled system.
Each Node Events situation table of table 1
The preferred embodiment of the application is the foregoing is only, the application is not limited to, for the skill of this area
For art personnel, the application can have various modifications and variations.It is all within spirit herein and principle, made any repair
Change, equivalent substitution, improvement etc., should be included within the protection domain of the application.
Although above-mentioned the embodiment of the present invention is described with reference to accompanying drawing, not to present invention protection model
The limitation enclosed, one of ordinary skill in the art should be understood that on the basis of technical scheme those skilled in the art are not
Need to pay various modifications or deform still within protection scope of the present invention that creative work can make.
Claims (10)
1. one kind mixing multi-infeed HVDC system secondary voltage control method, it is characterized in that：Comprise the following steps：
(1) the backbone point bus set for participating in secondary voltage control is selected；
(2) according to the power flow equation of the whole network, sensitivity matrix of the backbone point busbar voltage on reactive power is obtained, and according to spirit
Sensitive matrix sets up secondary voltage control model；
(3) secondary voltage control model is solved, try to achieve each controlled synchronous generator and HVDC converter substation and other
The Reactive-power control amount of backbone point, carries out secondary voltage control accordingly.
2. a kind of mixing multi-infeed HVDC system secondary voltage control method as claimed in claim 1, it is characterized in that：The step
Suddenly in (1), it is determined that the on high-tension side bus of generator of secondary voltage control is participated in, by high voltage direct current converter bus and other participations
The load-center substation bus of secondary voltage control is used as the maincenter bus set for mixing multi-infeed HVDC system secondary voltage control.
3. a kind of mixing multi-infeed HVDC system secondary voltage control method as claimed in claim 1, it is characterized in that：The step
Suddenly in (2), the acquisition methods of sensitivity matrix are：The power flow equation of AC system is calculated, if bus has VSC-HVDC
Feed-in or LCC-HVDC feed-ins, are corrected, are tried to achieve according to revised power flow equation accordingly to the Jacobian matrix of system
The sensitivity equation of multi-infeed HVDC system.
4. a kind of mixing multi-infeed HVDC system secondary voltage control method as claimed in claim 3, it is characterized in that：The step
Suddenly in (2), when bus i has LCC-HVDC feed-ins, then according to the active power and idle work(of the i-th feedback direct current feed-in AC system
Rate is modified to the partial derivative of change of current bus i voltage magnitudes to its Jacobian matrix；Or, in the step (2), as bus k
There is VSC-HVDC feed-ins, then kth feedback VSC-HVDC feed-in AC system active power and reactive power are to change of current bus k voltages
The partial derivative of phase angle and voltage magnitude is modified to its Jacobian matrix.
5. a kind of mixing multi-infeed HVDC system secondary voltage control method as claimed in claim 1, it is characterized in that：The step
Suddenly in (2), the construction method of secondary voltage control model is：According to the sensitivity matrix of acquisition, with reference to the backbone point of collection
Voltage actual value, and tertiary voltage control issue the voltage reference value of backbone point, and foundation is set with all backbone point voltage deviations
The multi-infeed HVDC system secondary voltage control model of the minimum target of quadratic sum of definite value.
6. a kind of mixing multi-infeed HVDC system secondary voltage control method as claimed in claim 1, it is characterized in that：The step
Suddenly in (2), multi-infeed HVDC system secondary voltage control model is using voltage sensibility equation as equality constraint, with reactive source
Reactive power it is adjustable up and down be limited to inequality constraints condition；
Or, inequality constraints condition also includes the idle adjustable bounds of VSC-HVDC, LCC-HVDC current conversion stations and other backbone points
Interior reactive power compensator bound.
7. a kind of mixing multi-infeed HVDC system secondary voltage control method as claimed in claim 1, it is characterized in that：The step
Suddenly in (3), secondary voltage control model is solved using quadratic programming, each controlled synchronous generator and high straightening is tried to achieve
Flow current conversion station and the Reactive-power control amount of other backbone points.
8. a kind of mixing multi-infeed HVDC system secondary voltage control method as claimed in claim 1, it is characterized in that：The step
Suddenly in (3), for generator, idle control strategy is issued in the form of generator reactive adjustment amount, and then by generator reactive
Adjustment amount is converted into the voltage reference value adjustment amount of generator generator terminal, field regulator parameter is changed, to realize voltage control.
9. a kind of mixing multi-infeed HVDC system secondary voltage control method as claimed in claim 1, it is characterized in that：The step
Suddenly in (3), for VSC-HVDC current conversion stations, idle control strategy is issued to VSC-HVDC current conversion stations in the form of idle adjustment amount
Straight-flow system key-course, carries out transverter injecting power control.
10. a kind of mixing multi-infeed HVDC system secondary voltage control method as claimed in claim 1, it is characterized in that：It is described
In step (3), for LCC-HVDC current conversion stations, idle control strategy is issued to the LCC-HVDC changes of current in the form of idle adjustment amount
Station control, change of current station control issues instruction and carries out the control of reactive power compensating to reactive compensator controller.
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| CN112202182A (en) * | 2020-09-27 | 2021-01-08 | 重庆大学 | AC/DC coordination secondary voltage control method considering voltage reactive power control of converter station |
| CN114784815A (en) * | 2022-04-21 | 2022-07-22 | 国网浙江省电力有限公司经济技术研究院 | State judgment method and device of multi-feed-in system and electronic equipment |
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