CN107809118A - Design method of ring-opening scheme of electromagnetic ring network - Google Patents

Design method of ring-opening scheme of electromagnetic ring network Download PDF

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Publication number
CN107809118A
CN107809118A CN201610814390.5A CN201610814390A CN107809118A CN 107809118 A CN107809118 A CN 107809118A CN 201610814390 A CN201610814390 A CN 201610814390A CN 107809118 A CN107809118 A CN 107809118A
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sending end
active power
network
direct current
ccc
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CN107809118B (en
Inventor
康鹏
张东辉
林成
刘蔚
孙斌
杨健
马覃峰
程兰芬
欧阳可凤
徐敏
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China South Power Grid International Co ltd
Electric Power Scheduling Control Center Of Guizhou Power Grid Co ltd
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China South Power Grid International Co ltd
Electric Power Scheduling Control Center Of Guizhou Power Grid Co ltd
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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
    • 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]
    • 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

The invention discloses a design method of an electromagnetic looped network ring-releasing scheme, relates to the technical field of direct-current transmission, and aims to solve the problems that in the prior art, when an electromagnetic looped network is positioned in a delivery channel of a delivery-end power grid, the construction difficulty of operators is high, and the ring-releasing cost is high. The design method of the electromagnetic looped network ring-opening scheme comprises the following steps: acquiring a ring-opening point of the electromagnetic looped network, and additionally arranging a flexible direct-current back-to-back system for ring opening at the ring-opening point to construct a virtual ring-opening scheme; under the condition of ensuring stable isolated network operation frequency of a power grid at a sending end, obtaining a critical active power value of a flexible direct current back-to-back system; determining the ring-opening cost for additionally arranging the flexible direct current back-to-back system according to the critical active power value of the flexible direct current back-to-back system; and determining whether to adopt the virtual ring-opening scheme as a target ring-opening scheme or not according to the relationship between the ring-opening cost and the estimated ring-opening cost of the electromagnetic ring network. The design method of the ring-opening scheme of the electromagnetic ring network is used for an outgoing channel of a sending-end power grid.

Description

A kind of design method of electromagnetic looped network uncoupling loop scheme
Technical field
The present invention relates to technical field of direct current power transmission, more particularly to a kind of design method of electromagnetic looped network uncoupling loop scheme.
Background technology
With the continuous development of network system, one or more electromagnetic looped networks, electromagnetism ring occurs in network system mostly Net is also known as high and low electromagnetic circle net, refers to the circuit of two groups of difference voltage class operations, passes through the connection of both ends transformer magnetic loop It is parallel running.
And the presence of electromagnetic looped network brings many uncertain factors to the development of network system, when electromagnetic looped network is located at sending end During the Transmission Corridor of power network, once the high-tension line tripping operation in electromagnetic looped network, network system trend will be low into electromagnetic looped network Line transitions are pressed, also easily cause the low-voltage circuit overload trip in electromagnetic looped network, so as to cause partial electric grid to be had a power failure on a large scale.Cause This, in order to ensure the stable operation of sending end power network, it is necessary to formulate complete operation of power networks control regulation and corresponding safety measure To tackle the major accident of burst, electromagnetic looped network, which unlink, just turns into a kind of conventional selection of reply burst accident.
At present, it is for the electromagnetic looped network positioned at sending end power network Transmission Corridor, the conventional method of unlinking：In sending end power network Strengthen the grid structure of high-tension line in Transmission Corridor, avoid high-tension line from all tripping；Or in existing Transmission Corridor Standby ultra-high-tension power transmission line is set up, after electromagnetic looped network mesohigh circuit all trips, by starting standby high voltage power transmission Circuit, to keep the open loop operation of sending end power network.
However, by strengthening the grid structure of high-tension line or setting up the method solution of unlinking of standby ultra-high-tension power transmission line During ring electromagnetic looped network, because the Transmission Corridor coverage of sending end power network is wider, strengthen grid structure or the increasing of high-tension line The ultra-high-tension power transmission line of equipment, it is both needed to cover larger boundary of works area and takes longer construction period, construction is more difficult, Also larger cost of unlinking can be expended, very big inconvenience is brought to operating personnel.
The content of the invention
It is electric in the prior art to solve it is an object of the invention to provide a kind of design method of electromagnetic looped network uncoupling loop scheme When magnet ring net is located at the Transmission Corridor of sending end power network, operating personnel's difficulty of construction greatly and unlink cost it is high the problem of.
To achieve these goals, the present invention provides following technical scheme：
A kind of design method of electromagnetic looped network uncoupling loop scheme, electromagnetic looped network are located at the Transmission Corridor of sending end power network, the electricity The design method of magnet ring net uncoupling loop scheme comprises the following steps：
Step 1, the solution circling point of electromagnetic looped network is obtained, the flexible direct current back-to-back system (CCC-0) structure to unlink is set up in Xie Huandianchu Virtual uncoupling loop scheme；
Step 2, electromagnetic looped network is unlinked by virtual uncoupling loop scheme, is ensureing that sending end power network isolated power grid frequency is steady Under conditions of fixed, the critical active power value of flexible direct current back-to-back system (CCC-0) is obtained；
Step 3, according to the critical active power value of flexible direct current back-to-back system (CCC-0), it is determined that setting up flexible direct current and being back-to-back The cost of unlinking of system；
Step 4, according to the magnitude relationship for estimating cost of unlinking of unlink cost and electromagnetic looped network, it is determined whether using virtual Uncoupling loop scheme is as target uncoupling loop scheme.
Compared with prior art, the design method of electromagnetic looped network uncoupling loop scheme provided by the invention has below beneficial to effect Fruit：
In the design method of electromagnetic looped network uncoupling loop scheme provided by the invention, set up and unlink in the solution circling point of electromagnetic looped network Flexible direct current back-to-back system (CCC-0), construct virtual uncoupling loop scheme, while back-to-back using flexible direct current in virtual uncoupling loop scheme The critical active power value of system, it is determined that set up the cost of unlinking of the flexible direct current back-to-back system (CCC-0), and by the cost of unlinking Compared with estimating cost of unlinking, to control the cost of unlinking of electromagnetic looped network；So when estimating for existing uncoupling loop scheme is unlinked When cost is too high, it is possible to by selecting virtual uncoupling loop scheme to be used as target uncoupling loop scheme, electromagnetic looped network is unlinked, so as to Reduce the cost of unlinking of electromagnetic looped network；
It is to set up the flexible direct current that unlinks in the solution circling point of electromagnetic looped network and be back-to-back to be additionally, since virtual uncoupling loop scheme System, such flexible direct current back-to-back system (CCC-0) also just uniquely determine in the construction location of electromagnetic looped network, and because flexible direct current leans against Back of the body system does not need the auxiliary operation of the equipment such as extra reactive-load compensation wave filter, the flexible direct current back-to-back system (CCC-0) floor space Small, the construction period taken needed for its construction and installation is also shorter, therefore, when the virtual uncoupling loop scheme of selection is as target uncoupling loop scheme Afterwards, the operation difficulty unlinked using target uncoupling loop scheme to electromagnetic looped network will substantially reduce.
Brief description of the drawings
Accompanying drawing described herein is used for providing a further understanding of the present invention, forms the part of the present invention, this hair Bright schematic description and description is used to explain the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is the design method flow chart one of electromagnetic looped network uncoupling loop scheme provided in an embodiment of the present invention；
Fig. 2 is the design method flowchart 2 of electromagnetic looped network uncoupling loop scheme provided in an embodiment of the present invention；
Fig. 3 is the grid structure schematic diagram of electromagnetic looped network provided in an embodiment of the present invention；
Fig. 4 is the grid structure schematic diagram of electromagnetic looped network solution circling point provided in an embodiment of the present invention；
Fig. 5 is the frequency curve schematic diagram of sending end power network isolated power grid provided in an embodiment of the present invention.
Reference：
1-500kV first sends out passage, and 2-500kV second sends out passage,
3-220kV first sends out passage, and 4-220kV second sends out passage,
5- sending end power networks, 6- major networks,
7- flexible direct current back-to-back system (CCC-0).
Embodiment
For ease of understanding, with reference to Figure of description, to the method for unlinking of electromagnetic looped network provided in an embodiment of the present invention It is described in detail.
Refering to Fig. 1-2, electromagnetic looped network is located at the Transmission Corridor of sending end power network, electromagnetic looped network provided in an embodiment of the present invention The method of unlinking comprises the following steps：
Step 1, the solution circling point of electromagnetic looped network is obtained, the flexible direct current back-to-back system (CCC-0) structure void unlinked is set up in solution circling point Intend uncoupling loop scheme；
Step 2, electromagnetic looped network is unlinked by virtual uncoupling loop scheme, is ensureing that sending end power network isolated power grid frequency is steady Under conditions of fixed, the critical active power value of flexible direct current back-to-back system (CCC-0) is obtained；
Step 3, according to the critical active power value of flexible direct current back-to-back system (CCC-0), it is determined that setting up flexible direct current and being back-to-back The cost of unlinking of system；
Step 4, according to cost and the magnitude relationship for estimating cost of unlinking of electromagnetic looped network of unlinking, it is determined whether use The virtual uncoupling loop scheme is as target uncoupling loop scheme.
When it is implemented, in the design method of electromagnetic looped network uncoupling loop scheme provided in an embodiment of the present invention, in solution circling point Set up the flexible direct current back-to-back system (CCC-0) to unlink and build virtual uncoupling loop scheme, by determining flexible direct current in the virtual uncoupling loop scheme The critical active power value that back-to-back system (CCC-0) should possess, can obtain and set up unlinking into needed for flexible direct current back-to-back system (CCC-0) This, that then sets up unlinked needed for flexible direct current back-to-back system (CCC-0) cost and electromagnetic looped network by comparing estimates the big of cost of unlinking It is small, to consider whether the virtual uncoupling loop scheme for setting up flexible direct current back-to-back system (CCC-0) is feasible；Specifically, work as the virtual uncoupling loop scheme Unlink cost less than or equal to electromagnetic looped network estimate unlink cost when, it is target uncoupling loop scheme to determine the virtual uncoupling loop scheme, I.e. described virtual uncoupling loop scheme is feasible；When the cost of unlinking of the virtual uncoupling loop scheme estimates cost of unlinking more than electromagnetic looped network When, then the virtual uncoupling loop scheme is infeasible, the electromagnetic looped network can only be unlinked by other existing uncoupling loop schemes.Its In, the cost of unlinking of estimating of electromagnetic looped network refers to estimate when unlinking to same electromagnetic looped network by other conventional uncoupling loop schemes Minimum cost of unlinking.
By above-mentioned specific implementation process, the design side of electromagnetic looped network uncoupling loop scheme provided in an embodiment of the present invention Method, the flexible direct current back-to-back system (CCC-0) to unlink is set up in the solution circling point of electromagnetic looped network, virtual uncoupling loop scheme is constructed, utilizes simultaneously The critical active power value of flexible direct current back-to-back system (CCC-0) in virtual uncoupling loop scheme, it is determined that setting up the flexible direct current and being back-to-back The cost of unlinking of system, and this is unlinked into cost compared with estimating cost of unlinking, to control the cost of unlinking of electromagnetic looped network；This Sample when existing uncoupling loop scheme estimate cost of unlinking it is too high when, it is possible to by selecting virtual uncoupling loop scheme to be used as the target side of unlinking Case, electromagnetic looped network is unlinked, so as to reduce the cost of unlinking of electromagnetic looped network；
It is to set up the flexible direct current that unlinks in the solution circling point of electromagnetic looped network and be back-to-back to be additionally, since virtual uncoupling loop scheme System, such flexible direct current back-to-back system (CCC-0) also just uniquely determine in the construction location of electromagnetic looped network, and because flexible direct current leans against Back of the body system does not need the auxiliary operation of the equipment such as extra reactive-load compensation wave filter, the flexible direct current back-to-back system (CCC-0) floor space Small, the construction period taken needed for its construction and installation is also shorter, therefore, when the virtual uncoupling loop scheme of selection is as target uncoupling loop scheme Afterwards, the operation difficulty unlinked using target uncoupling loop scheme to electromagnetic looped network will substantially reduce.
In addition, when determining that the virtual uncoupling loop scheme is feasible, i.e., during using the virtual uncoupling loop scheme as target uncoupling loop scheme, Flexible direct current back-to-back system (CCC-0) is set up in solution circling point to unlink to electromagnetic looped network, by flexible direct current back-to-back system (CCC-0) to direct current The change of the sense of current, can easily invert network system trend, and the presence of flexible direct current back-to-back system (CCC-0), also and be not required to The active power of output of sending end power network Transmission Corridor is limited, the flexible direct current back-to-back system (CCC-0) can realize network system trend Flexible dispatching and control；Also, flexible direct current back-to-back system (CCC-0) can provide quick independent dynamic reactive for sending end power network Compensation and active power regulation, the active power and reactive power of sending end power network are concurrently and independently controlled, is favorably improved sending end Frequency stability during power network isolated power grid.
It should be noted that in step 2, the acquisition methods bag of the critical active power value of flexible direct current back-to-back system (CCC-0) Include：
Step 201, rated frequency value during sending end power network isolated power grid frequency stabilization is determined, rated frequency value includes stable state Rated frequency value fWWith transient state rated frequency value fZ.And rated frequency value during sending end power network isolated power grid frequency stabilization, Ying Youben Art personnel refer to《Guiding rules of power system safety and stability》Specifically determined Deng electric power relevant criterion and its technical experience, generally The span of steady frequency value is 49.2Hz~50.5Hz, and the span of transient frequency value is 47.5Hz~51.5Hz.
Step 202, the first metastable critical active power value P of flexible direct current back-to-back system (CCC-0) is obtainedVSC1-W；
The acquisition formula of first metastable critical active power value is：
Wherein, PLFor the active power value of sending end power network Transmission Corridor, PGFor total active power of sending end power network unit generation Value, R are sending end power network unit single frequency modulation difference coefficient, Δ fWThe steady frequency deviation allowed for sending end power network isolated power grid Value.
Step 203, the critical active power value P of the first transient state of flexible direct current back-to-back system (CCC-0) is obtainedVSC1-Z；
Obtain sending end power network isolated network transient state running frequency and be equal to transient state rated frequency value fZWhen, sending end power network unit generation Transient state active power value Δ PZ；And the transient state active power value Δ P of sending end power network unit generationZObtain by the following method：
Establish having for frequency variable Δ f and sending end power network unit generation after sending end power network is corrected by first-order lag link Work(power and variable Δ P relation function：
In formula,
The active power variable Δ P of sending end power network unit generation span is 0~PG；
M is the inertia time constant of sending end power network unit, and T is first-order lag link time constant, and t is time variable；
Frequency variable Δ f after sending end power network is corrected by first-order lag link is equal to transient state rated frequency value fZWhen, The active power variable Δ P of the sending end power network unit generation obtained by above-mentioned relation function is the temporary of sending end power network unit generation State active power value Δ PZ。
Then, according to the active power value P of sending end power network Transmission CorridorLWith the transient state wattful power of sending end power network unit generation Rate value Δ PZ, the critical active power value P of the first transient state can be passed throughVSC1-ZAcquisition formula：PVSC1-Z=PL-ΔPZ, it is temporary to obtain first The critical active power value P of stateVSC1-Z。
Step 204, according to the first metastable critical active power value P of flexible direct current back-to-back system (CCC-0)VSC1-WAnd flexible direct current The critical active power value P of the first transient state of back-to-back system (CCC-0)VSC1-ZCompare and take greatly, obtain the critical of flexible direct current back-to-back system (CCC-0) Critical active power value=Max (P of active power value, i.e. flexible direct current back-to-back system (CCC-0)VSC1-W, PVSC1-Z)。
In order to which on the premise of sending end power network isolated power grid frequency stabilization is ensured, flexible direct current back-to-back system (CCC-0) can have Minimum cost of unlinking, method provided in an embodiment of the present invention of unlinking can also pass through by means of cutting machine in high week in sending end power network Compare using the second critical active power value of flexible direct current back-to-back system (CCC-0) when cutting machine peace control auxiliary high week and do not use high week The size of the first critical active power value of flexible direct current back-to-back system (CCC-0), redefines the flexible direct current back of the body when cutting machine peace control auxiliary The critical active power value of seat back system.
The critical active power value of the flexible direct current back-to-back system (CCC-0) determined in step 204 is the first critical active power value PVSC1, i.e. PVSC1=Max (PVSC1-W, PVSC1-Z)；
Step 205, after acquisition sending end power network cuts machine using high week, the second metastable critical of flexible direct current back-to-back system (CCC-0) has Work(performance number PVSC2-M；
Second metastable critical active power value
Wherein, Δ PCMachine amount is cut for cut machine high week.
And that cuts machine high week cuts machine amount Δ PCSpecific value should be by those skilled in the art according to the conventional meter that cut machine amount The estimation of calculation method obtains.A kind of specific evaluation method is provided in embodiment provided by the invention, that cuts machine high week cuts machine amountWherein, Δ P1With Δ P2Acquisition methods, the transient state wattful power with sending end power network unit generation Rate value Δ PZAcquisition methods it is identical, pass through frequency variable Δ f and sending end power network after the correction of sending end power network first-order lag link The active power variable Δ P of unit generation relation function：Really It is fixed；
Frequency variable Δ f after sending end power network is corrected by first-order lag link is equal to transient frequency value fZ1When, pass through The active power variable Δ P for the sending end power network unit generation that above-mentioned relation function obtains is Δ P1；When sending end power network passes through single order Frequency variable Δ f after delay component correction is equal to transient frequency value fZ2When, the sending end power network that is obtained by above-mentioned relation function The active power variable Δ P of unit generation is Δ P2；Transient frequency value fZ1With transient frequency value fZ2Respectively sending end power network isolated network Two groups of highest frequency values that transient state running frequency allows when stable.
Step 206, after acquisition sending end power network cuts machine using high week, the second transient state of flexible direct current back-to-back system (CCC-0) is critical to be had Work(performance number PVSC2-Z, and the critical active power value P of the second transient stateVSC2-Z=PL-ΔPZ-ΔPC；
Step 207, according to the second metastable critical active power value P of flexible direct current back-to-back system (CCC-0)VSC2-WAnd flexible direct current The critical active power value P of the second transient state of back-to-back system (CCC-0)VSC2-ZCompare and take greatly, obtain the second of flexible direct current back-to-back system (CCC-0) Critical active power value PVSC2, i.e. PVSC2=Max (PVSC2-W, PVSC2-Z)；
Step 208, according to the first critical active power value PVSC1With the second critical active power value PVSC2Compare and take small, obtain To the critical active power value of flexible direct current back-to-back system (CCC-0), i.e., the critical active power value of flexible direct current back-to-back system (CCC-0)= Min(PVSC1, PVSC2)。
The design method of electromagnetic looped network uncoupling loop scheme provided in an embodiment of the present invention cuts machine peace control high week by comparing to use The second of flexible direct current back-to-back system (CCC-0) the critical active power value and not using is cut flexible straight during machine peace control auxiliary in high week during auxiliary The size of the first critical active power value of back-to-back system (CCC-0) is flowed, the minimum critical for redefining flexible direct current back-to-back system (CCC-0) has Work(performance number, it can further reduce the cost of unlinking set up needed for flexible direct current back-to-back system (CCC-0).
In order to ensure flexible direct current back-to-back system (CCC-0) is when with the minimum critical active power value, sending end can be made electric Net isolated power grid frequency keeps stable, in the design method for the electromagnetic looped network uncoupling loop scheme that the present embodiment provides, when target solution Fixed condition is that cost of unlinking estimates cost of unlinking less than or equal to electromagnetic looped network really for ring scheme, that is to say, that when the virtual side of unlinking Case unlink cost less than or equal to electromagnetic looped network estimate unlink cost when, it is target uncoupling loop scheme to determine the virtual uncoupling loop scheme When, the design method of electromagnetic looped network uncoupling loop scheme also includes：
Step 5, simulation model is built according to target uncoupling loop scheme, sets the critical wattful power of flexible direct current back-to-back system (CCC-0) Rate value is the active power simulation parameter of flexible direct current back-to-back system (CCC-0)；
Step 6, simulation analysis are carried out to the simulation model, to verify that flexible direct current is back-to-back according to target uncoupling loop scheme Whether system can make sending end power network isolated power grid frequency stabilization；
Determined whether according to the stability of sending end power network isolated power grid frequency using target uncoupling loop scheme as uncoupling loop scheme； If specifically, after target uncoupling loop scheme simulation analysis, sending end power network isolated network can be made by verifying flexible direct current back-to-back system (CCC-0) Running frequency is stable, then regard the target uncoupling loop scheme as uncoupling loop scheme, and flexible direct current back-to-back system (CCC-0) is set up solving circling point, right Electromagnetic looped network is unlinked；If after target uncoupling loop scheme simulation analysis, verifying flexible direct current back-to-back system (CCC-0) can not make to send Power network isolated power grid frequency stabilization is held, then abandons to reselect existing as uncoupling loop scheme using the target uncoupling loop scheme Other uncoupling loop schemes unlink to the electromagnetic looped network.
In order to obtain the equilibrium of flexible direct current back-to-back system (CCC-0) economy and stability of unlinking, in the electricity that the present embodiment provides In the design method of magnet ring net uncoupling loop scheme, target uncoupling loop scheme is determined not according to the stability of sending end power network isolated power grid frequency When can make sending end power network isolated power grid frequency stabilization, the design method of electromagnetic looped network uncoupling loop scheme also includes：
Step 7, the active power simulation parameter of flexible direct current back-to-back system (CCC-0) is debugged, until in simulation model, it is flexible straight Stream back-to-back system (CCC-0) can make sending end power network isolated power grid frequency stabilization, obtain the simulated active work(of flexible direct current back-to-back system (CCC-0) Rate value；
Step 8, according to the simulated active power value of flexible direct current back-to-back system (CCC-0), it is determined that setting up flexible direct current and being back-to-back The emulation of system is unlinked cost；
Step 9, unlinked cost and the magnitude relationship for estimating cost of unlinking of electromagnetic looped network according to emulation, it is determined whether use Target uncoupling loop scheme after debugging is as uncoupling loop scheme；Cost is pre- less than or equal to electromagnetic looped network specifically, if emulation is unlinked Estimate cost of unlinking, then set up in solution circling point as uncoupling loop scheme using the target uncoupling loop scheme after debugging and possess simulated active work( The flexible direct current back-to-back system (CCC-0) of rate value, unlinks to electromagnetic looped network；If emulation is unlinked, cost is pre- more than electromagnetic looped network Estimate cost of unlinking, then abandon reselecting existing other as uncoupling loop scheme using the target uncoupling loop scheme after debugging and unlinking Scheme is unlinked to the electromagnetic looped network.
For the design method of electromagnetic looped network uncoupling loop scheme that clearer explanation above-described embodiment is provided, refering to Fig. 3- 5, in the partial electric grid shown in Fig. 3, by taking the grid structure of electromagnetic looped network present on the Transmission Corridor of sending end power network 5 as an example, come The effect of unlinking of the method for unlinking for the electromagnetic looped network that the checking embodiment of the present invention is provided.
In the partial electric grid shown in Fig. 3, A, B, C, E, F, G, H, I, J, K are respectively the various regions power plant in partial electric grid, D For current conversion station, c, d, e, f, g, h, i, j, k, l are respectively the various regions transformer station in partial electric grid, and a, b are respectively 500kV power transformations Stand, m, n are respectively 220kV transformer stations；Wherein, the first Transmission Corridors of 500kV 1 being made up of a-A and the 500kV being made up of a-B Second Transmission Corridor 2 be the Transmission Corridor of sending end power network 5 high-tension line, by m-n the first Transmission Corridors of 220kV 3 formed and by The second Transmission Corridors of 220kV 4 that m-n is formed are the low-voltage circuit of the Transmission Corridor of sending end power network 5, and the high-tension line and described Low-voltage circuit forms the electromagnetic looped network of the Transmission Corridor of sending end power network 5.
In the partial electric grid shown in Fig. 3, the first Transmission Corridors of 500kV 1 and the second Transmission Corridors of 500kV 2 are in same Forest zone, at mountain fire season, the first Transmission Corridors of 500kV 1 and the second Transmission Corridors of 500kV 2 easily trip simultaneously, cause the office The isolated power grid of sending end power network 5 of portion's power network；If keeping the electromagnetic looped network in partial electric grid to run, need to reduce sending end power network The active power value of section is sent out, after avoiding the first Transmission Corridors of 500kV 1 and the tripping operation of the second Transmission Corridors of 500kV 2,220kV There is the situation overloaded in first Transmission Corridor 3 and the second Transmission Corridors of 220kV 4.
However, to ensure that the active power of the Transmission Corridor of sending end power network 5 output disclosure satisfy that the use demand of major network 6, and The isolated power grid frequency stabilization of sending end power network 5, then need to unlink to the electromagnetic looped network of the Transmission Corridor of sending end power network 5, unlink Point should at the first Transmission Corridors of 220kV 3 being made up of m-n and the second Transmission Corridors of the 220kV being made up of m-n 4, refering to Fig. 4, Structure sets up the virtual uncoupling loop scheme of a set of flexible direct current back-to-back system (CCC-0) 7 in m transformer stations.
When being unlinked by above-mentioned virtual uncoupling loop scheme to sending end power network 5, the isolated power grid of sending end power network 5 should be determined first Rated frequency value during frequency stabilization, i.e. stable state rated frequency value fWFor 50Hz, maximum is no more than 50.5Hz；Transient state rated frequency Value fZFor 51Hz, maximum is no more than 51.5Hz.
When the small method of operation operation rich using power system of sending end power network, total active power of sending end power network unit generation Value PGFor 2500MW, the active power value P of sending end power network Transmission CorridorLThe stable state allowed for 900MW, sending end power network isolated power grid Exemplary frequency deviation values Δ fWFor 0.5Hz, sending end power network unit single frequency modulation difference coefficient R is 0.1, the inertial time of sending end power network unit Between constant M be 10, first-order lag link time constant T be 0.5.
The determination method of the critical active power value of flexible direct current back-to-back system (CCC-0) provided according to embodiments of the present invention, will be upper The value for stating each parameter substitutes into, it may be determined that：
First metastable critical active power value of flexible direct current back-to-back system (CCC-0)
The transient state active power value Δ P=0.18P of sending end power network unit generationG；
The critical active power value P of the first transient state of flexible direct current back-to-back system (CCC-0)VSC1-Z=PL-ΔPZ=450MW；
First critical active power value of flexible direct current back-to-back system (CCC-0)
PVSC1=Max (PVSC1-W, PVSC1-Z)=450MW；
fZ1During=51.5Hz,fZ2During=51Hz,
That cuts machine high week cuts machine amount
Second metastable critical active power value of flexible direct current back-to-back system (CCC-0)
The critical active power value of the second transient state of flexible direct current back-to-back system (CCC-0)
PVSC2-Z=PL-ΔPZ-ΔPC=200MW；
Second critical active power value of flexible direct current back-to-back system (CCC-0)
PVSC2=Max (PVSC2-W, PVSC2-Z)=200MW；
The critical active power value P of flexible direct current back-to-back system (CCC-0)VSC=Min (PVSC1, PVSC2)=200MW.
According to the critical active power value 200MW of the flexible direct current back-to-back system (CCC-0) of determination, it can calculate and set up flexibility Cost of unlinking needed for back-to-back HVDC system for 2.4 hundred million yuan, and during the conventional uncoupling loop scheme of use, unlink by estimating for electromagnetic looped network Cost is 300,000,000 yuan；Estimate unlink cost of the cost less than electromagnetic looped network of unlinking for the virtual uncoupling loop scheme that the present embodiment provides, this The virtual uncoupling loop scheme that embodiment provides can be identified as target uncoupling loop scheme.
, can in order to check flexible direct current back-to-back system (CCC-0) in the minimum critical active power value with above-mentioned 200MW The sending end power network isolated power grid frequency shown in Fig. 3 is kept stable, in power system analysis software PSD-BPA, build in electricity Magnet ring net solution circling point sets up the simulation model of flexible direct current back-to-back system (CCC-0), and carries out the first Transmission Corridors of 500kV 1 and 500kV The simulation analysis that second Transmission Corridor 2 all trips；Wherein, the critical active power value of flexible direct current back-to-back system (CCC-0) is set 200MW is the active power simulation parameter of flexible direct current back-to-back system (CCC-0)；When setting flexible direct current back-to-back system (CCC-0) normal operation Do not send active power outside；When machine is cut in use, which high week, carries out peace control auxiliary, if transient frequency reaches transient state rated frequency value fZ, Set and cut machine-cut high week except the 250MW units in sending end grid generation unit.
The result of flexible direct current back-to-back system (CCC-0) post-simulation analysis is set up in electromagnetic looped network solution circling point as shown in figure 5, when soft Property back-to-back HVDC system unlink after electromagnetic looped network, provided by flexible direct current back-to-back system (CCC-0) for sending end power network quickly active Power adjusting so that the maximum transient frequency values after sending end power network isolated power grid are no more than 51.5Hz, and maximum steady state frequency values are not More than 50.43Hz, the service requirement of sending end power network isolated power grid frequency stabilization is disclosure satisfy that, it is therefore, above-mentioned in electromagnetic looped network solution The uncoupling loop scheme that circling point sets up flexible direct current back-to-back system (CCC-0) is feasible, and operating personnel can set up flexible direct current in solution circling point and lean against Back of the body system, unlinks to electromagnetic looped network.
In the description of above-mentioned embodiment, specific features, structure, material or feature can be in any one or more Combined in an appropriate manner in individual embodiment or example.
The foregoing is only a specific embodiment of the invention, but protection scope of the present invention is not limited thereto, any Those familiar with the art the invention discloses technical scope in, change or replacement can be readily occurred in, should all be contained Cover within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.

Claims (10)

1. a kind of design method of electromagnetic looped network uncoupling loop scheme, the electromagnetic looped network are located at the Transmission Corridor of sending end power network, it is special Sign is that the design method of the electromagnetic looped network uncoupling loop scheme comprises the following steps：
Step 1, the solution circling point of the electromagnetic looped network is obtained, the flexible direct current back-to-back system (CCC-0) structure to unlink is set up in the solution circling point Build virtual uncoupling loop scheme；
Step 2, the electromagnetic looped network is unlinked by the virtual uncoupling loop scheme, is ensureing sending end power network isolated power grid frequency Under conditions of rate is stable, the critical active power value of the flexible direct current back-to-back system (CCC-0) is obtained；
Step 3, according to the critical active power value of the flexible direct current back-to-back system (CCC-0), leaned against it is determined that setting up the flexible direct current The cost of unlinking of back of the body system；
Step 4, according to cost and the magnitude relationship for estimating cost of unlinking of electromagnetic looped network of unlinking, it is determined whether described in use Virtual uncoupling loop scheme is as target uncoupling loop scheme.
2. the design method of electromagnetic looped network uncoupling loop scheme according to claim 1, it is characterised in that in step 2, obtain The acquisition methods of the critical active power value of the flexible direct current back-to-back system (CCC-0) include：
Step 201, rated frequency value during sending end power network isolated power grid frequency stabilization is determined, the rated frequency value includes stable state Rated frequency value fWWith transient state rated frequency value fZ；
Step 202, the first metastable critical active power value P of the flexible direct current back-to-back system (CCC-0) is obtainedVSC1-W；
Step 203, the critical active power value P of the first transient state of the flexible direct current back-to-back system (CCC-0) is obtainedVSC1-Z；
Step 204, by the first metastable critical active power value P of the flexible direct current back-to-back system (CCC-0)VSC1-WIt is straight with the flexibility Flow the critical active power value P of the first transient state of back-to-back system (CCC-0)VSC1-ZIt is compared, the larger flexibility as described in of numerical value is straight Flow the critical active power value of back-to-back system (CCC-0)；Wherein,
Critical active power value=Max (P of the flexible direct current back-to-back system (CCC-0)VSC1-W, PVSC1-Z)。
3. the design method of electromagnetic looped network uncoupling loop scheme according to claim 2, it is characterised in that in step 202, institute State the first metastable critical active power value PVSC1-WObtain by the following method：
<mrow> <msub> <mi>P</mi> <mrow> <mi>V</mi> <mi>S</mi> <mi>C</mi> <mn>1</mn> <mo>-</mo> <mi>W</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>P</mi> <mi>L</mi> </msub> <mo>-</mo> <mfrac> <mrow> <msub> <mi>&amp;Delta;f</mi> <mi>W</mi> </msub> </mrow> <msub> <mi>f</mi> <mi>W</mi> </msub> </mfrac> <mo>&amp;times;</mo> <mfrac> <mn>1</mn> <mi>R</mi> </mfrac> <mo>&amp;times;</mo> <msub> <mi>P</mi> <mi>G</mi> </msub> <mo>;</mo> </mrow>
Wherein, PLFor the active power value of sending end power network Transmission Corridor, PGFor total active power value of sending end power network unit generation, R For sending end power network unit single frequency modulation difference coefficient, Δ fWThe steady frequency deviation allowed for sending end power network isolated power grid.
4. the design method of electromagnetic looped network uncoupling loop scheme according to claim 2, it is characterised in that in step 203, institute State the critical active power value P of the first transient stateVSC1-ZObtain by the following method：
Obtain the active power value P of sending end power network Transmission CorridorL,
Obtain sending end power network isolated network transient state running frequency and be equal to the transient state rated frequency value fZWhen, sending end power network unit generation Transient state active power value Δ PZ；
According to the active power value P of the sending end power network Transmission CorridorLWith the transient state active power of the sending end power network unit generation It is worth Δ PZ, obtain the critical active power value P of first transient stateVSC1-Z；Wherein, PVSC1-Z=PL-ΔPZ。
5. the design method of electromagnetic looped network uncoupling loop scheme according to claim 4, it is characterised in that the sending end power network machine The transient state active power value Δ P that group generates electricityZObtain by the following method：
Establish the wattful power of frequency variable Δ f and sending end power network unit generation after sending end power network is corrected by first-order lag link Rate variable Δ P relation function：
<mrow> <mi>&amp;Delta;</mi> <mi>f</mi> <mo>=</mo> <mn>50</mn> <mo>&amp;times;</mo> <mi>R</mi> <mo>&amp;times;</mo> <mfrac> <mrow> <mi>&amp;Delta;</mi> <mi>P</mi> </mrow> <msub> <mi>P</mi> <mi>G</mi> </msub> </mfrac> <mo>&amp;lsqb;</mo> <mn>1</mn> <mo>-</mo> <mrow> <mo>(</mo> <mi>cos</mi> <mi>b</mi> <mi>t</mi> <mo>-</mo> <mfrac> <mrow> <mi>a</mi> <mo>+</mo> <mi>c</mi> </mrow> <mi>b</mi> </mfrac> <mi>sin</mi> <mi>b</mi> <mi>t</mi> <mo>)</mo> </mrow> <msup> <mi>e</mi> <mrow> <mo>-</mo> <mi>a</mi> <mi>t</mi> </mrow> </msup> <mo>&amp;rsqb;</mo> <mo>;</mo> </mrow>
In formula,
The active power variable Δ P of sending end power network unit generation span is 0~PG；
Wherein, PGFor total active power value of sending end power network unit generation, R is sending end power network unit single frequency modulation difference coefficient, M For the inertia time constant of sending end power network unit, T is first-order lag link time constant, and t is time variable；
Frequency variable Δ f after the sending end power network is corrected by first-order lag link is equal to the transient state rated frequency value fZ When, the active power variable Δ P of the sending end power network unit generation obtained by the relation function is the sending end power network The transient state active power value Δ P of unit generationZ。
6. the design method of electromagnetic looped network uncoupling loop scheme according to claim 2, it is characterised in that in step 204, obtain The critical active power value of the flexible direct current back-to-back system (CCC-0) be the first critical active power value PVSC1, PVSC1=Max (PVSC1-W, PVSC1-Z)；
In step 2, obtaining the acquisition methods of the critical active power value of the flexible direct current back-to-back system (CCC-0) also includes：
Step 205, obtain after the sending end power network cuts machine using high week, the second stable state of the flexible direct current back-to-back system (CCC-0) is faced Boundary active power value PVSC2-M；
Step 206, obtain after the sending end power network cuts machine using high week, the second transient state of the flexible direct current back-to-back system (CCC-0) is faced Boundary active power value PVSC2-Z；
Step 207, by the second metastable critical active power value P of the flexible direct current back-to-back system (CCC-0)VSC2-WIt is straight with the flexibility Flow the critical active power value P of the second transient state of back-to-back system (CCC-0)VSC2-ZIt is compared, the larger flexibility as described in of numerical value is straight Flow the second critical active power value P of back-to-back system (CCC-0)VSC2, PVSC2=Max (PVSC2-W, PVSC2-Z)；
Step 208, by the described first critical active power value PVSC1With the described second critical active power value PVSC2It is compared, Using the less critical active power value as the flexible direct current back-to-back system (CCC-0) of numerical value, the flexible direct current back-to-back system (CCC-0) Critical active power value=Min (PVSC1, PVSC2)。
7. the design method of electromagnetic looped network uncoupling loop scheme according to claim 6, it is characterised in that described in step 205 Second metastable critical active power value PVSC2-WObtain by the following method：
<mrow> <msub> <mi>P</mi> <mrow> <mi>V</mi> <mi>S</mi> <mi>C</mi> <mn>2</mn> <mo>-</mo> <mi>W</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>P</mi> <mi>L</mi> </msub> <mo>-</mo> <mfrac> <mrow> <msub> <mi>&amp;Delta;f</mi> <mi>w</mi> </msub> </mrow> <msub> <mi>f</mi> <mi>w</mi> </msub> </mfrac> <mo>&amp;times;</mo> <mfrac> <mn>1</mn> <mi>R</mi> </mfrac> <mo>&amp;times;</mo> <mrow> <mo>(</mo> <msub> <mi>P</mi> <mi>G</mi> </msub> <mo>-</mo> <msub> <mi>&amp;Delta;P</mi> <mi>C</mi> </msub> <mo>)</mo> </mrow> <mo>-</mo> <msub> <mi>&amp;Delta;P</mi> <mi>C</mi> </msub> <mo>;</mo> </mrow>
Wherein, PLFor the active power value of sending end power network Transmission Corridor, PGFor total active power value of sending end power network unit generation, R For sending end power network unit single frequency modulation difference coefficient, Δ fwThe steady frequency deviation allowed for sending end power network isolated power grid, Δ PC Machine amount is cut for cut machine the high week.
8. the design method of electromagnetic looped network uncoupling loop scheme according to claim 6, it is characterised in that in step 206, institute State the critical active power value P of the second transient stateVSC2-ZObtain by the following method：
Obtain the active power value P of sending end power network Transmission CorridorL,
Obtain sending end power network isolated network transient state running frequency and be equal to the transient state rated frequency value fZWhen, sending end power network unit generation Transient state active power value Δ PZ,
Obtain cut machine high week cut machine amount Δ PC,
According to the active power value P of the sending end power network Transmission CorridorL, the sending end power network unit generation transient state active power It is worth Δ PZMachine amount Δ P is cut with cut machine the high weekC, obtain the critical active power value P of second transient stateVSC2-Z；Wherein, PVSC2-Z=PL-ΔPZ-ΔPC。
9. the design method of the electromagnetic looped network uncoupling loop scheme according to claim any one of 1-8, it is characterised in that the mesh Mark uncoupling loop scheme really fixed condition for it is described unlink cost less than or equal to the electromagnetic looped network estimate unlink cost when, the electricity The design method of magnet ring net uncoupling loop scheme also includes：
Step 5, simulation model is built according to the target uncoupling loop scheme, setting the critical of flexible direct current back-to-back system (CCC-0) has Work(performance number is the active power simulation parameter of the flexible direct current back-to-back system (CCC-0)；
Step 6, simulation analysis are carried out to the simulation model, to verify that the flexible direct current is carried on the back according to the target uncoupling loop scheme Whether seat back system can make the sending end power network isolated power grid frequency stabilization；
Determine whether to be used as using the target uncoupling loop scheme according to the stability of the sending end power network isolated power grid frequency and unlink Scheme.
10. the design method of electromagnetic looped network uncoupling loop scheme according to claim 9, it is characterised in that
Determine that the target uncoupling loop scheme makes the sending end power network lonely according to the stability of the sending end power network isolated power grid frequency During network operation frequency stabilization, using the target uncoupling loop scheme as uncoupling loop scheme；
Determine that the target uncoupling loop scheme fails to make the sending end electricity according to the stability of the sending end power network isolated power grid frequency During net isolated power grid frequency stabilization, the method for unlinking of the electromagnetic looped network also includes：
Step 7, the active power simulation parameter of the flexible direct current back-to-back system (CCC-0) is debugged, until in the simulation model, institute The sending end power network isolated power grid frequency stabilization can be made by stating flexible direct current back-to-back system (CCC-0), obtain flexible direct current back-to-back system (CCC-0) Simulated active power value；
Step 8, according to the simulated active power value of the flexible direct current back-to-back system (CCC-0), leaned against it is determined that setting up the flexible direct current The emulation of back of the body system is unlinked cost；
Step 9, unlink cost and the magnitude relationship for estimating cost of unlinking of the electromagnetic looped network are emulated according to described, it is determined whether Using the target uncoupling loop scheme after debugging as uncoupling loop scheme.
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