CN108258714A - A kind of power grid start-up mode optimization method for improving layer-specific access extra-high voltage direct-current transmission ability - Google Patents
A kind of power grid start-up mode optimization method for improving layer-specific access extra-high voltage direct-current transmission ability Download PDFInfo
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- CN108258714A CN108258714A CN201810055014.1A CN201810055014A CN108258714A CN 108258714 A CN108258714 A CN 108258714A CN 201810055014 A CN201810055014 A CN 201810055014A CN 108258714 A CN108258714 A CN 108258714A
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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
- 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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
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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]
Abstract
The invention discloses a kind of power grid start-up mode optimization methods for improving layer-specific access extra-high voltage direct-current transmission ability, belong to Power System and its Automation technical field.The present invention is under the premise of grid structure is fixed and load is certain, it obtains in the opposite net of dc power fire escape trend on the basis of the sensitivity of unit output and direct current landing power, by adjusting receiving end power grid unit output, in the case where meeting receiving end power grid dc power trend evacuation section stability limit constraints, Optimal Power Flow, the conveying capacity of layering direct current is improved, it can ability to transmit electricity with the maximum for determining the direct current for being limited by receiving end electric network swim evacuation capacity.The present invention is that the method for operation of direct current feedthrough system is layered by reasonable arrangement extra-high voltage, it is ensured that straight-flow system capacity gives full play to, and improves the ability to transmit electricity of extra-high voltage layering direct current.
Description
Technical field
The invention belongs to Power System and its Automation technical fields, and more precisely, the present invention relates to a kind of improve to divide
The power grid start-up mode optimization method of layer access extra-high voltage direct-current transmission ability.
Background technology
In order to which the domestic scholars such as the trend reasonable layout of multi-infeed HVDC receiving end power grid, Liu Zhenya is guided creatively to propose
Extra-high voltage direct-current accesses receiving end power grid using layer-specific access pattern, i.e. extra-high voltage direct-current is respectively connected to the friendship of different voltages grade
Galvanic electricity net, this is a kind of method that multi-infeed HVDC system is solved the problems, such as from electric network composition.
At present, China has more times extra-high voltage layering DC transmission engineerings and smoothly builds up and put into operation.Extra-high voltage direct-current
The mode of layer-specific access different voltages grade AC network is different from the conventional point based on LCC (line commutation transverter) completely
To a DC transmission system, also different from the situation of Multi-infeed HVDC transmission system.In addition to direct current operation in itself and controlling party
Formula will be totally different from conventional both-end DC transmission system, and since the reciprocation between 1000kV and 500kV power grids will
Large effect is generated to the trend evacuation of AC network.
The ability to transmit electricity that direct current conveying capacity not only exchanges fire escape with receiving end power grid is closely related, but also with exchanging system
The start-up mode of system is related with specific output situation, therefore studies and how to adjust in the case where grid structure is fixed and load is certain
The output of straightening stream receiving end grid generation unit is meeting receiving end power grid dc power trend evacuation section stability limit constraint item
Under part so that extra-high voltage direct-current can convey more direct currents and have very important significance.
At present, has certain research in terms of by electric energy power in direct current feed-in power grid.Chinese patent application
201610266208.7 to disclose a kind of receiving end power grid extra-high voltage alternating current-direct current optimal by electric ratio appraisal procedure, by trend, short
Road, stability check obtain feasible extra-high voltage alternating current-direct current by electric scheme.Chinese patent application 201510848912.9 discloses one
Near region Line Flow method of adjustment under kind direct current layer-specific access mode, considering reduces dc power, stoppage in transit direct current layer list
The control means such as a or multiple transverters realize the Line Flow tune to the heavy duty of receiving end current conversion station near region or more than stability limitation
It is whole.It is new that Chinese patent application 200910070419.3 discloses a kind of cut set section tidal current oriented control based on direct current factor table
According to the needs of section tidal current oriented control, using factor table information, section tidal current is determined by nonlinear optimization procedure for method
Regulation and control scheme.
Invention content
The purpose of the present invention is：The characteristics of for extra-high voltage layering direct current access, it is extra-high to provide a kind of raising layer-specific access
The power grid start-up mode optimization method of straightening stream ability to transmit electricity.
Specifically, the present invention is realized using following technical solution, include the following steps：
1) under the premise of layering direct current receiving-end system operation grid structure determines, it is defeated to calculate each dc power of receiving end power grid
The section tidal current for sending channel is damp relative to the sensitivity of each unit output, the section of each dc power transfer passage in receiving end power grid
Stream relative to layering the high-end landing power of direct current sensitivity and each dc power transfer passage section tidal current relative to
The sensitivity of direct current low side landing power is layered, if kijSection tidal current for i-th of dc power transfer passage is relative to jth
The sensitivity of a unit output, kid1Section tidal current for i-th of dc power transfer passage is relative to the layering high-end landing of direct current
The sensitivity of power, kid2Section tidal current for i-th of dc power transfer passage lands power relative to layering direct current low side
Sensitivity, wherein i=1,2 ... m, m be receiving end power grid dc power transfer passage sum, j=1,2 ... n, n are receiving end
The sum of unit in power grid；
2) based on the current typical operation modes of system, it is currently high that the current practical output of each unit, layering direct current are obtained
End landing power Pd10Power P is landed with low sided20And the transmission power that each dc power transfer passage is current, if PGj0It is
The current practical output of j unit, Pi0The transmission power current for i-th of dc power transfer passage；
3) the big of direct current both ends power adjustment during load flow rectification is determined according to the method for operation of direct current in the following manner
The small and adjusted size of relationship of unit output：
If Pd10=Pd20, illustrate that it is height end balance movement to be layered direct current, then the increased power of high low side is answered equal and waited
Reduce the half of total amount in all unit outputs, there is load flow rectification of i-th of dc power transfer passage relative to j-th of unit
Coefficient
If Pd10=2Pd20, the high low side for illustrating direct current is off-center operation, and high side power is twice of low side power,
There is load flow rectification coefficient of i-th of dc power transfer passage relative to j-th of unit
If Pd10=Pd20/ 2, the high low side for illustrating direct current is off-center operation, and low side power is twice of high side power,
There is load flow rectification coefficient of i-th of dc power transfer passage relative to j-th of unit
4) based on power grid current operation grid structure and the method for operation, the disconnected of each dc power transfer passage of power grid is obtained
The maximum operation power P of face stability limitation, the minimum and maximum active power output of each unit and the high low side of direct currentd1NAnd Pd2NIf
PiNFor the section stability limitation of i-th of dc power transfer passage, PGjNAnd PGjMRespectively j-th of the minimum and maximum of unit has
Work(is contributed, it is determined that the section tidal current P of i-th of dc power transfer passagei, j-th unit output PGjAnd direct current height
The operation power P at endd1And Pd2The boundary condition that should meet is as follows：
5) electrical power can be landed by solving direct current maximum using linear programming function, acquired and be limited by section tidal current evacuation restriction
Direct current maximum can power transmission power PdmaxAnd corresponding each unit output adjusted value；
6) system operation mode is adjusted to the targeted manner solved to linear programming function, and nucleus correcting system is in current way
Under transient stability, if transient stability margin be less than system allow operation lower limiting value, gradually dropped according to certain gradient
Low DC operation power until meet temporarily steady constraint just.
Above-mentioned technical proposal is further characterized by, in the step 1), kij、kid1And kid2Circular such as
Under：
Increase the active power output of j-th of unit, if corresponding increment value is Δ PGj, obtain increase Δ PGjAfterwards i-th
The section tidal current changing value Δ P of dc power transfer passagei-Gj, then the section tidal current of i-th of dc power transfer passage is opposite
In the sensitivity k of j-th of unit outputijFor：
The increase layering high-end landing power of direct current, if corresponding increment value is Δ Pd1, obtain increase Δ Pd1Afterwards i-th
The section tidal current changing value Δ P of dc power transfer passagei-d1, then the section tidal current of i-th of dc power transfer passage is opposite
In layering the high-end landing power of direct current sensitivity be kid1：
Increase layering direct current low side landing power, if corresponding increment value is Δ Pd2, obtain increase Δ Pd2Afterwards i-th
The section tidal current changing value Δ P of dc power transfer passagei-d2, then the section tidal current of i-th of dc power transfer passage is opposite
In the sensitivity k of layering direct current low side landing powerid2For：
Above-mentioned technical proposal is further characterized by, and the step 5) specifically includes procedure below：
Linear programming function is：Solve minf (x), f (x)=Δ PG1+ΔPG2+…+ΔPGn；
Constraints is：
In formula：
Above-mentioned E1Matrix for n × 1；
Then direct current maximum can transmission power be Pdmax=Pd10+Pd20- min f (x), corresponding solution vector x are each unit
Output adjusted value.
Beneficial effects of the present invention are as follows：The method of the present invention is suitable for extra-high voltage layering direct current receiving end Power grid structure and consolidates
Fixed and certain load situation, in the case where meeting dc power trend evacuation section stability limit constraints, by adjusting receiving end
Power grid unit output Optimal Power Flow, can ability to transmit electricity with the maximum for determining the direct current for being limited by receiving end electric network swim evacuation capacity.
The present invention makes full use of dc power fire escape trend under fixed grid structure to land work(with respect to unit output in net and direct current
The sensitivity of rate remains unchanged this characteristic, estimates the maximum of AC system and can evacuate power, on the one hand ensures that layering is straight
Stream advantage gives full play to, and improves the conveying capacity of layering direct current to greatest extent, is on the other hand the AC network method of operation
Reasonable arrangement provide theoretical foundation, the trend for avoiding dc power fire escape is out-of-limit.
Description of the drawings
Fig. 1 is the flow chart of the method for the present invention；
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings.
Embodiment 1：
The present embodiment discloses a kind of power grid start-up mode optimization side for improving layer-specific access extra-high voltage direct-current transmission ability
Method, basic principle are：Receiving end power grid is under a certain load level, if only considering the safety and stability of DC power flow fire escape about
Beam is arranged by the rational method of operation, and estimate extra-high voltage layering direct current maximum lands power.This method is based on current
Typical operation modes, the spirit of each trend evacuation section is asked for by adjusting the output of single unit or the output of direct current one end
Sensitivity, using principle of stacking, the knots modification and unit output reduction amount and direct current for listing section tidal current land power increase
Relational expression.The linear programming function in Matlab simulation softwares is recycled to solve the maximum of direct current can power transmission power and right
Each unit output size answered.Its specific implementation step is as shown in Figure 1.
The method for the section tidal current sensitivity for being to determine dc power transfer passage that step 1 describes, that is, be layered in Fig. 1
Under the premise of direct current receiving-end system operation grid structure determines, the section tidal current of each dc power transfer passage of receiving end power grid is calculated
Relative to the sensitivity of each unit output in receiving end power grid, each dc power transfer passage section tidal current relative to layering direct current
The section tidal current of the sensitivity of high-end landing power and each dc power transfer passage is relative to layering direct current low side landing
The sensitivity of power, if kijSection tidal current for i-th of dc power transfer passage is relative to the sensitive of j-th unit output
Degree, kid1For i-th of dc power transfer passage section tidal current relative to layering the high-end landing power of direct current sensitivity,
kid2Section tidal current for i-th of dc power transfer passage lands the sensitivity of power relative to layering direct current low side, wherein
I=1,2 ... m, m are the sum of receiving end power grid dc power transfer passage, and j=1,2 ... n, n are the total of unit in receiving end power grid
Number.
The section tidal current of each dc power transfer passage is relative to the Calculation of Sensitivity of each unit output in receiving end power grid
Principle is, on the basis of known typical way, the balancing machine of system will be set as apart from a certain unit of direct current drop point farther out,
The imbalance power of system is made up by adjusting the output of balancing machine, specially：
Increase the active power output of j-th of unit, if corresponding increment value is Δ PGj, obtain increase Δ PGjAfterwards i-th
The section tidal current changing value Δ P of dc power transfer passagei-Gj, then the section tidal current of i-th of dc power transfer passage is opposite
In the sensitivity k of j-th of unit outputijFor：
The increase layering high-end landing power of direct current, if corresponding increment value is Δ Pd1, obtain increase Δ Pd1Afterwards i-th
The section tidal current changing value Δ P of dc power transfer passagei-d1, then the section tidal current of i-th of dc power transfer passage is opposite
In layering the high-end landing power of direct current sensitivity be kid1：
Increase layering direct current low side landing power, if corresponding increment value is Δ Pd2, obtain increase Δ Pd2Afterwards i-th
The section tidal current changing value Δ P of dc power transfer passagei-d2, then the section tidal current of i-th of dc power transfer passage is opposite
In the sensitivity k of layering direct current low side landing powerid2For：
The initial value for being to determine initial launch mode correlated variables that step 2 describes in Fig. 1, i.e., based on the current typical case of system
The method of operation obtains the current practical output of each unit, layering direct current currently high-end landing power Pd10Power is landed with low side
Pd20And the transmission power that each dc power transfer passage is current, if PGj0The practical output current for j-th of unit, Pi0For
The current transmission power of i-th of dc power transfer passage.
Step 3 describes to determine direct current both ends power tune during load flow rectification according to the method for operation of direct current in Fig. 1
Whole size and the adjusted size of relationship of unit output, it is specific as follows.
If Pd10=Pd20, illustrate that it is height end balance movement to be layered direct current, then the increased power of high low side is answered equal and waited
Reduce the half of total amount in all unit outputs, there is load flow rectification of i-th of dc power transfer passage relative to j-th of unit
Coefficient
If Pd10=2Pd20, the high low side for illustrating direct current is off-center operation, and high side power is twice of low side power,
There is load flow rectification coefficient of i-th of dc power transfer passage relative to j-th of unit
If Pd10=Pd20/ 2, the high low side for illustrating direct current is off-center operation, and low side power is twice of high side power,
There is load flow rectification coefficient of i-th of dc power transfer passage relative to j-th of unit
What step 4 described in Fig. 1 is to determine the relevant border condition during dc power adjustment, specific as follows.
Based on power grid current operation grid structure and the method for operation, the section of each dc power transfer passage of power grid is obtained
The maximum operation power P of stability limitation, the minimum and maximum active power output of each unit and the high low side of direct currentd1NAnd Pd2NIf PiN
For the section stability limitation of i-th of dc power transfer passage, PGjNAnd PGjMRespectively j-th unit it is minimum and maximum active
It contributes, it is determined that the section tidal current P of i-th of dc power transfer passagei, j-th unit output PGjAnd the high low side of direct current
Operation power Pd1And Pd2The boundary condition that should meet is as follows：
Step 5 describes that using linear programming function solution direct current maximum electrical power can be landed in Fig. 1, acquires and is limited by
The direct current maximum that section tidal current evacuation restricts can power transmission power PdmaxAnd corresponding each unit output adjusted value.It can pass through
Matlab is specifically solved, specially：
Linear programming function is：Solve minf (x), f (x)=Δ PG1+ΔPG2+…+ΔPGn；
Constraints is：
In formula：
Above-mentioned E1Matrix for n × 1；
Then direct current maximum can transmission power be Pdmax=Pd10+Pd20- minf (x), corresponding solution vector x are that each unit goes out
Power adjusted value.
Step 6 describes to judge that the maximum of direct current reality can power transmission according to the solving result of linear programming function in Fig. 1
Power, it is specific as follows：
System operation mode is adjusted to the targeted manner of linear programming for solution, and nucleus correcting system is temporary under current way
If transient stability margin allows the lower limiting value of operation less than system, direct current is continuously decreased according to certain gradient for state stability
Power is run until meeting temporarily steady constraint just.
Although the present invention has been described by way of example and in terms of the preferred embodiments, embodiment is not for limiting the present invention's.Not
It is detached from the spirit and scope of the present invention, any equivalence changes done or retouching, also belongs to the protection domain of the present invention.Cause
This protection scope of the present invention should be using the content that claims hereof is defined as standard.
Claims (3)
- A kind of 1. power grid start-up mode optimization method for improving layer-specific access extra-high voltage direct-current transmission ability, which is characterized in that packet Include following steps：1) under the premise of layering direct current receiving-end system operation grid structure determines, it is logical to calculate each dc power conveying of receiving end power grid The section tidal current in road is relative to the sensitivity of each unit output in receiving end power grid, the section tidal current phase of each dc power transfer passage For being layered the sensitivity of the high-end landing power of direct current and the section tidal current of each dc power transfer passage relative to layering Direct current low side lands the sensitivity of power, if kijSection tidal current for i-th of dc power transfer passage is relative to j-th of machine The sensitivity that group is contributed, kid1Section tidal current for i-th of dc power transfer passage is relative to the layering high-end landing power of direct current Sensitivity, kid2Section tidal current for i-th of dc power transfer passage lands power relative to layering direct current low side Sensitivity, wherein i=1,2 ... m, m are the sum of receiving end power grid dc power transfer passage, and j=1,2 ... n, n are receiving end power grid The sum of interior unit；2) based on the current typical operation modes of system, obtain that the current practical output of each unit, layering direct current are current high-end to be fallen Ground power Pd10Power P is landed with low sided20And the transmission power that each dc power transfer passage is current, if PGj0It is j-th The current practical output of unit, Pi0The transmission power current for i-th of dc power transfer passage；3) in the following manner according to the method for operation of direct current determine during load flow rectification the size of direct current both ends power adjustment with The adjusted size of relationship of unit output：If Pd10=Pd20, illustrate that it is height end balance movement to be layered direct current, then the increased power of high low side is answered equal and equal to institute The half for having unit output to reduce total amount, there is load flow rectification coefficient of i-th of dc power transfer passage relative to j-th of unitIf Pd10=2Pd20, the high low side for illustrating direct current is off-center operation, and high side power is twice of low side power, there is i-th A dc power transfer passage relative to j-th of unit load flow rectification coefficientIf Pd10=Pd20/ 2, the high low side for illustrating direct current is off-center operation, and low side power is twice of high side power, there is I dc power transfer passage relative to j-th of unit load flow rectification coefficient4) based on power grid current operation grid structure and the method for operation, the section for obtaining each dc power transfer passage of power grid is steady The maximum operation power P of fixed limit volume, the minimum and maximum active power output of each unit and the high low side of direct currentd1NAnd Pd2NIf PiNFor The section stability limitation of i-th of dc power transfer passage, PGjNAnd PGjMRespectively j-th unit it is minimum and maximum it is active go out Power, it is determined that the section tidal current P of i-th of dc power transfer passagei, j-th unit output PGjAnd the high low side of direct current Run power Pd1And Pd2The boundary condition that should meet is as follows：5) electrical power can be landed by solving direct current maximum using linear programming function, acquired and be limited by the straight of section tidal current evacuation restriction Flowing maximum can power transmission power PdmaxAnd corresponding each unit output adjusted value；6) system operation mode is adjusted to the targeted manner solved to linear programming function, and nucleus correcting system is under current way Transient stability if transient stability margin allows the lower limiting value of operation less than system, continuously decreases directly according to certain gradient Stream operation power until meet temporarily steady constraint just.
- 2. the power grid start-up mode optimization side according to claim 1 for improving layer-specific access extra-high voltage direct-current transmission ability Method, which is characterized in that in the step 1), kij、kid1And kid2Circular it is as follows：Increase the active power output of j-th of unit, if corresponding increment value is Δ PGj, obtain increase Δ PGjI-th of direct current afterwards The section tidal current changing value Δ P of power transfer passagei-Gj, then the section tidal current of i-th of dc power transfer passage is relative to jth The sensitivity k of a unit outputijFor：The increase layering high-end landing power of direct current, if corresponding increment value is Δ Pd1, obtain increase Δ Pd1I-th of direct current work(afterwards The section tidal current changing value Δ P of rate transfer passagei-d1, then the section tidal current of i-th of dc power transfer passage is relative to layering The sensitivity of the high-end landing power of direct current is kid1：Increase layering direct current low side landing power, if corresponding increment value is Δ Pd2, obtain increase Δ Pd2I-th of direct current work(afterwards The section tidal current changing value Δ P of rate transfer passagei-d2, then the section tidal current of i-th of dc power transfer passage is relative to layering Direct current low side lands the sensitivity k of powerid2For：
- 3. the power grid start-up mode optimization side according to claim 1 for improving layer-specific access extra-high voltage direct-current transmission ability Method, which is characterized in that the step 5) specifically includes procedure below：Linear programming function is：Solve minf (x), f (x)=Δ PG1+ΔPG2+…+ΔPGn；Constraints is：In formula：Above-mentioned E1Matrix for n × 1；Then direct current maximum can transmission power be Pdmax=Pd10+Pd20- minf (x), corresponding solution vector x are each unit output tune Whole value.
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| CN110311415A (en) * | 2019-08-07 | 2019-10-08 | 重庆大学 | A kind of transient stability margin appraisal procedure suitable for renewable energy power generation base during low voltage crossing |
| CN111987720A (en) * | 2020-08-26 | 2020-11-24 | 国网江苏省电力有限公司 | Method for evaluating power receiving and power supply margin intervals of receiving-end power grid under constraint of multichannel quota |
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| CN109193744A (en) * | 2018-10-09 | 2019-01-11 | 国网经济技术研究院有限公司 | The stability margin and its Sensitivity Analysis Method of extra-high voltage direct-current layer-specific access |
| CN110311415A (en) * | 2019-08-07 | 2019-10-08 | 重庆大学 | A kind of transient stability margin appraisal procedure suitable for renewable energy power generation base during low voltage crossing |
| CN111987720A (en) * | 2020-08-26 | 2020-11-24 | 国网江苏省电力有限公司 | Method for evaluating power receiving and power supply margin intervals of receiving-end power grid under constraint of multichannel quota |
| CN113131528A (en) * | 2021-04-23 | 2021-07-16 | 广东电网有限责任公司 | Method, device, equipment and storage medium for determining optimal capacity of wind fire bundling |
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