CN107069757B - A kind of mixing multi-infeed HVDC system secondary voltage control method - Google Patents
A kind of mixing multi-infeed HVDC system secondary voltage control method Download PDFInfo
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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
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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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- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a kind of mixing multi-infeed HVDC system secondary voltage control methods, pass 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 about reactive power is obtained, and secondary voltage control model is established 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 acquired, carries out secondary voltage control accordingly.The secondary voltage of on-line coordination control mixing multi-infeed HVDC system may be implemented.
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 controls
Method.
Background technique
Tertiary voltage control pattern is the learning algorithms mode generallyd use in the world, big in France, meaning
The countries such as benefit, Spain, Belgium and Brazil put into practice, and most domestic saves net and also puts into operation, and achieve preferably
Effect.In such a mode, wherein the main target of secondary voltage control is reset one in region with certain coordination strategy
The setting value of each automatic voltage regulator of step voltage control layer makes the voltage value of backbone point deviate the setting of tertiary voltage control layer
Backbone point voltage reference value within the acceptable range.Secondary voltage control is the key that connect other two level rings
Section, the angle that it can be stable from region voltage, rationally, in phase distribute local area within each Voltage-Reactive Power source it is idle
Power can improve the voltage level in region to a certain extent and improve the voltage stability of system.
With the continuous development of power grid and the gradually in-depth of power system reform, the competition of Power Market is more drilled more
Strong, in order to improve economy, more and more operation of power networks states have been approached or have reached the operational limit of system, and voltage is steady
Determine problem to become increasingly conspicuous.Especially under the overall background of China's transferring electricity from the west to the east, a large amount 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 stability problem of AC system is more prominent, is mainly manifested in idle resource diversification, and control means are complicated, majority control
Control equipment relies solely on information on the spot and controls etc., causes the voltage power-less on-line coordination control for realizing receiving end AC system
There are many difficulties.Especially the mixing multi-infeed HVDC system of the feed-in containing VSC-HVDC and LCC-HVDC, reactive source are more multiple
It is miscellaneous, how reasonable coordination and distribution are carried out to the reactive source of system, they are that mixing multi-infeed HVDC system keeps voltage stabilization
It is crucial.
Summary of the invention
The present invention to solve the above-mentioned problems, proposes a kind of 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 the goals above, the present invention adopts the following technical scheme:
A kind of mixing multi-infeed HVDC system secondary voltage control method, comprising 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 about reactive power, and root are obtained
Secondary voltage control model is established according to sensitivity matrix；
(3) secondary voltage control model is solved, acquire 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), determine that the on high-tension side bus of generator for participating in secondary voltage control, high voltage direct current converter are female
Line and the load-center substation bus of other participation secondary voltage controls are as mixing multi-infeed HVDC system secondary voltage control
Maincenter bus set.
In the step (2), the acquisition methods of sensitivity matrix are as follows: the power flow equation for calculating AC system, if there is mother
There are VSC-HVDC feed-in or LCC-HVDC feed-ins for line, are corrected accordingly to the Jacobian matrix of system, after amendment
Power flow equation acquire the sensitivity equation of multi-infeed HVDC system.
Further, in the step (2), when there are LCC-HVDC feed-ins by bus i, then according to the i-th feedback LCC-HVDC feedback
The active power and reactive power for entering AC system repair the partial derivative of change of current bus i voltage magnitude to its Jacobian matrix
Just.
Further, in the step (2), when there are VSC-HVDC feed-ins by bus k, then kth feedback VSC-HVDC feed-in is handed over
Streaming system active power and reactive power to the partial derivative of change of current bus k voltage phase angle and voltage magnitude to its Jacobian matrix into
Row amendment.
In the step (2), the construction method of secondary voltage control model are as follows: according to the sensitivity matrix of acquisition, in conjunction with
The voltage actual value and tertiary voltage control of the backbone point of acquisition issue the voltage reference value of backbone point, establish in 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 is limited to inequality constraints condition so that the reactive power of reactive source is adjustable up and down.
Further, inequality constraints condition further includes the idle adjustable bound of VSC-HVDC, LCC-HVDC converter station and
Reactive power compensator bound in other backbone points.
In the step (3), secondary voltage control model is solved using quadratic programming, acquires each controlled synchronous
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, into
And convert generator reactive adjustment amount to the voltage reference value adjustment amount of generator generator terminal, field regulator parameter is modified, with
Realize voltage control.
In the step (3), for VSC-HVDC converter station, idle control strategy is issued in the form of idle adjustment amount
VSC-HVDC converter station direct current system control layer carries out the control of inverter injecting power.
In the step (3), for LCC-HVDC converter station, idle control strategy is issued in the form of idle adjustment amount
LCC-HVDC change of current station control, change of current station control issue instruction and carry out reactive compensation control to reactive compensator controller
System.
Compared with prior art, the invention has the benefit that
(1) present invention has specific aim, carries out details for generator, VSC-HVDC converter station and LCC-HVDC converter station
The idle control strategy of adjustment, all targeted details adjustment of applicable situation applied widely and different for every kind,
Sufficiently meet its requirement；
(2) it may be implemented in the secondary voltage of signal coordination control mixing multi-infeed HVDC system.
Detailed description of the invention
The accompanying drawings constituting a part of this application is used to provide further understanding of the present application, and the application's shows
Meaning property embodiment and its explanation are not constituted an undue limitation on the present application for explaining the application.
Fig. 1 is step flow chart of the invention；
Fig. 2 is iterative process figure of the invention；
Fig. 3 is one configuration of power network of the embodiment of the present invention；
Fig. 4 is the calculated each backbone point Reactive-power control spirogram of the embodiment of the present invention one；
Fig. 5 is one dynamic simulation figure of the embodiment of the present invention；
Fig. 6 is voltage distribution graph before and after one event of the embodiment of the present invention.
Specific embodiment:
The invention will be further described with embodiment with reference to the accompanying drawing.
It is noted that following detailed description is all illustrative, it is intended to provide further instruction to the application.Unless another
It indicates, all technical and scientific terms used herein has 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 specific 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 singular
Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or their combination.
In a kind of typical embodiment of the application, as shown in Figure 1, Fig. 1, a kind of mixing multi-infeed HVDC system second level
Voltage control method, method includes the following steps:
A: analysis determines the maincenter bus set for participating in secondary voltage control；
B: according to the power flow equation of the whole network, sensitivity matrix of the backbone point busbar voltage about reactive power, and root are obtained
The secondary voltage control model of mixing multi-infeed HVDC system is established according to sensitivity matrix；
C: secondary voltage control model is solved using quadratic programming, acquires each controlled synchronous generator and high pressure
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 control.
It is further used as preferred embodiment, the step A comprising: the selected power generation 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 direct current system secondary voltage control.
It is further used as preferred embodiment, the step B comprising following steps:
B1: according to the power flow equation of the whole network, sensitivity matrix of the backbone point busbar voltage about reactive power is obtained；
B2: the secondary voltage control model of mixing multi-infeed HVDC system is established according to sensitivity matrix.
It is further used as preferred embodiment, the step B1 comprising 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 that ac bus voltage magnitude corrects square
Battle array.
B12: if bus i, there are LCC-HVDC feed-in, 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；WithLocal derviation of the active power and reactive power of respectively i-th feedback direct current feed-in AC system to change of current bus i voltage magnitude
Number.
B13: if bus k, there are VSC-HVDC feed-in, system Jacobian matrix respective element is modified to
Wherein
In formula,WithRespectively kth feedback VSC-HVDC feed-in AC system active power and
Partial derivative of the reactive power to change of current bus k voltage phase angle and voltage magnitude.
B14: enabling Δ P=0, releases Δ Q=J'RΔ V, and then the sensitivity equation that can acquire multi-infeed HVDC system is
In formula, matrix
It is further used as preferred embodiment, the step B2 comprising:
According to the sensitivity matrix of acquisition, the voltage of data acquisition and the backbone point of supervisor control (SCADA) acquisition
Actual value and tertiary voltage control issue the voltage reference value of backbone point, establish with all backbone point voltage deviation setting values
The minimum target of quadratic sum, voltage sensibility equation be equality constraint, the reactive power of reactive source is adjustable up and down is limited to
The multi-infeed HVDC system secondary voltage control model of formula constraint:
In formula, n is the number of nodes of backbone point bus in region；Vi(t)、Vi,refIt (t) is respectively electricity of the bus i in t moment
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 converter station and other backbone points
Reactive power compensation installations bound.
It is further used as preferred embodiment, the step C comprising using quadratic programming to secondary voltage control
Model is solved, and each controlled synchronous generator and HVDC converter substation and the Reactive-power control amount of other backbone points are acquired.
It is further used as preferred embodiment, the step D comprising: it is directed to generator, idle control strategy is to send out
The form of motor is idle adjustment amount is issued to the substation automatism voltage control (AVC), and the substation AVC converts generator reactive adjustment amount
For the voltage reference value adjustment amount of generator generator terminal, field regulator parameter is modified, to realize voltage control；For VSC-HVDC
Converter station, idle control strategy are issued to VSC-HVDC converter station direct current system control layer in the form of idle adjustment amount, carry out
The control of inverter injecting power；For LCC-HVDC converter station, idle control strategy is issued in the form of idle adjustment amount
LCC-HVDC change of current station control, change of current station control issue instruction and carry out reactive compensation control to reactive compensator controller
System.
Embodiment one
The present embodiment carries out furtherly specific implementation process of the invention for mixing double-fed direct current example system
It is bright.Mixing double-fed direct current system contains 1 time LCC-HVDC and 1 time VSC-HVDC and 2 synchronous generator.Detailed topology please join
According to Fig. 3.The specific implementation process of the present embodiment includes:
1) power network topology information, including network structure and power plant, DC converter station information are obtained, determines region maincenter
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 is 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 about reactive power, and root are obtained
The secondary voltage control model of mixing multi-infeed HVDC system is established according to sensitivity matrix.
3) secondary voltage control model is solved using quadratic programming, acquires 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 control.
5) dynamic simulation verifying 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 program, secondary voltage control process is as shown in Figure 5.System was at 41 seconds
When, load or burden without work increases suddenly, and the load incrementss of each node are as shown in table 1, and system voltage passes through 2 seconds transient processes, 43
It tends towards stability when the second, each node voltage of system reduces.After system detection deviates setting value to backbone point actual voltage value, starting two
Step voltage control algolithm, the reactive compensation amount for obtaining each backbone point are as shown in Figure 4.Reactive compensation is issued according to reactive compensation amount to refer to
It enables, at 50 seconds, each backbone point was compensated according to the instruction issued, and by about 2 seconds transient processes, system tended towards stability,
The voltage of each node is restored to reasonable level.Voltage's distribiuting and implementation second level electricity 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 foregoing is merely preferred embodiment of the present application, are not intended to limit this application, for the skill of this field
For art personnel, various changes and changes are possible in this application.Within the spirit and principles of this application, made any to repair
Change, equivalent replacement, improvement etc., should be included within the scope of protection of this application.
Above-mentioned, although the foregoing specific embodiments of the present invention is described with reference to the accompanying drawings, not protects model to the present invention
The limitation enclosed, those skilled in the art should understand that, based on the technical solutions of the present invention, those skilled in the art are not
Need to make the creative labor the various modifications or changes that can be made still within protection scope of the present invention.
Claims (8)
1. a kind of mixing multi-infeed HVDC system secondary voltage control method, it is characterized in that: the following steps are included:
A. analysis determines the backbone point bus set for participating in secondary voltage control, and the generator for selecting participation secondary voltage control is high
The bus of side is pressed, high voltage direct current converter bus and other load-center substation buses for participating in secondary voltage control are used as the more feedbacks of mixing
Enter the maincenter bus set of direct current system secondary voltage control；
B. according to the power flow equation of the whole network, sensitivity matrix of the backbone point busbar voltage about reactive power is obtained, and according to spirit
Sensitive matrix establishes the secondary voltage control model of mixing multi-infeed HVDC system；
In the step B, comprising the following steps:
B1: according to the power flow equation of the whole network, sensitivity matrix of the backbone point busbar voltage about reactive power is obtained；
B2: the secondary voltage control model of mixing multi-infeed HVDC system is established according to sensitivity matrix；
In the step B1, comprising 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, JQURespectively Jacobi
The corresponding sub-block matrix of matrix；Δ δ is ac bus phase angle correction matrix；Δ U is ac bus voltage magnitude correction matrix；
B12: if bus i, there are LCC-HVDC feed-in, 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；With
Partial derivative of the active power and reactive power of respectively i-th feedback direct current feed-in AC system to change of current bus i voltage magnitude；
B13: if bus k, there are VSC-HVDC feed-in, system Jacobian matrix respective element is modified to
Wherein
In formula,WithRespectively kth feedback VSC-HVDC feed-in AC system active power and idle function
Partial derivative of the rate to change of current bus k voltage phase angle and voltage magnitude；
B14: enabling Δ P=0, releases Δ Q=J'RΔ V, and then the sensitivity equation that can acquire multi-infeed HVDC system isIn formula, matrix
C. secondary voltage control model is solved using quadratic programming, acquires each controlled synchronous generator and high voltage direct current
The Reactive-power control amount of 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, second level electricity is carried out
Voltage-controlled system；
In the step B2, comprising:
According to the sensitivity matrix of acquisition, data acquisition and the voltage of the backbone point of supervisor control (SCADA) acquisition are practical
Value and tertiary voltage control issue the voltage reference value of backbone point, establish with the flat of all backbone point voltage deviation setting values
Square and minimum target, voltage sensibility equation are equality constraint, and the reactive power of reactive source is adjustable to be limited to inequality about up and down
The multi-infeed HVDC system secondary voltage control model of beam:
In formula, n is the number of nodes of backbone point bus in region；Vi(t)、Vi,refRespectively bus i t moment voltage magnitude and
The tertiary voltage management configuration value of maincenter bus i；Equality constraint is voltage sensibility equation, and inequality constraints is followed successively by generator
Idle adjustable bound, adjustable bound that VSC-HVDC is idle, reactive compensation dress in LCC-HVDC converter station and other backbone points
Set bound.
2. a kind of mixing multi-infeed HVDC system secondary voltage control method as described in claim 1, it is characterized in that: the step
In rapid B, the acquisition methods of sensitivity matrix are as follows: the power flow equation for calculating AC system, if there is there are VSC-HVDC feedbacks for bus
Enter or LCC-HVDC feed-in, the Jacobian matrix of system is corrected accordingly, is acquired according to revised power flow equation more
The sensitivity equation of feed-in direct current system.
3. a kind of mixing multi-infeed HVDC system secondary voltage control method as claimed in claim 2, it is characterized in that: the step
In rapid B, when there are LCC-HVDC feed-ins by bus i, then according to the active power and reactive power of the i-th feedback direct current feed-in AC system
The partial derivative of change of current bus i voltage magnitude is modified its Jacobian matrix；Or, in the step B, when bus k exists
VSC-HVDC feed-in, then kth feedback VSC-HVDC feed-in AC system active power and reactive power are to change of current bus k voltage phase angle
Its Jacobian matrix is modified with the partial derivative of voltage magnitude.
4. a kind of mixing multi-infeed HVDC system secondary voltage control method as described in claim 1, it is characterized in that: the step
In rapid B, the construction method of secondary voltage control model are as follows: according to the sensitivity matrix of acquisition, in conjunction with the electricity of the backbone point of acquisition
Compacting actual value and tertiary voltage control issue the voltage reference value of backbone point, establish with the setting of all backbone point voltage deviations
The multi-infeed HVDC system secondary voltage control model of the minimum target of the quadratic sum of value.
5. a kind of mixing multi-infeed HVDC system secondary voltage control method as described in claim 1, it is characterized in that: the step
In rapid C, secondary voltage control model is solved using quadratic programming, acquires each controlled synchronous generator and high voltage direct current
The Reactive-power control amount of converter station and other backbone points.
6. a kind of mixing multi-infeed HVDC system secondary voltage control method as described in claim 1, it is characterized in that: the step
In rapid D, for generator, idle control strategy is issued to automatism voltage control (AVC) in the form of generator reactive adjustment amount
Substation, the substation AVC convert generator reactive adjustment amount to the voltage reference value adjustment amount of generator generator terminal, modify adjustment of field excitation
Device parameter, to realize voltage control.
7. a kind of mixing multi-infeed HVDC system secondary voltage control method as described in claim 1, it is characterized in that: the step
In rapid D, for VSC-HVDC converter station, idle control strategy is issued to the VSC-HVDC change of current in the form of idle adjustment amount and stood erectly
Streaming system control layer carries out the control of inverter injecting power.
8. a kind of mixing multi-infeed HVDC system secondary voltage control method as described in claim 1, it is characterized in that: the step
In rapid D, for LCC-HVDC converter station, idle control strategy is issued to LCC-HVDC converter station control in the form of idle adjustment amount
Device processed, change of current station control issue instruction and carry out the control of reactive power compensating to reactive compensator controller.
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| CN111756061B (en) * | 2020-05-19 | 2022-03-11 | 国电南瑞科技股份有限公司 | Static security domain control method and system considering new energy power grid faults and prediction |
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