CN108879729A - Direct current interacted system frequency Emergency Assistance and quick recovery control method and system - Google Patents
Direct current interacted system frequency Emergency Assistance and quick recovery control method and system Download PDFInfo
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- CN108879729A CN108879729A CN201810820526.2A CN201810820526A CN108879729A CN 108879729 A CN108879729 A CN 108879729A CN 201810820526 A CN201810820526 A CN 201810820526A CN 108879729 A CN108879729 A CN 108879729A
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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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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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 direct current interacted system frequency Emergency Assistances and quick recovery control method and system, after electric system is disturbed, it carries out to support control as the direct-current emergency of control amount using two sides frequency departure amount, and frequency stabilization identification is added, until the frequency fluctuation of DC link two sides AC system is respectively less than its setting value, keep the quantity of power on current DC link constant, carry out frequency correction control, power regulation to outside the system amount of imports, the departure of correction current system frequency and systematic steady state frequency is more than the side system frequency of allowed band, when system reaches minimum safe running frequency, start frequency modulation frequency modulation control, to system frequency non differential regulation, realization system running frequency quickly recovers to steady-state operation frequency.
Description
Technical field
The invention belongs to direct current transportation control operation field more particularly to a kind of direct current interacted system frequency Emergency Assistance with
Quick recovery control method and system.
Background technique
With the development of energy internet, the demand of long distance power transmission constantly increases, and renewable energy power generation ratio is continuous
It improves, conventional AC transmission of electricity faces many technological challenges in terms of the access of extensive new energy and remote energy delivery.In order to
Flexibility, economy and the reliability of electric system are further increased, the interconnection scale of power grid is growing.Due to interconnected network
The complexity of structure, each region part throttle characteristics and system operation mode have significant difference.It is disturbed when interacted system is met with, region
The problems such as stability of power grid will be affected, and interacted system faces low-frequency oscillation, cascading failure.Since dc power is to exchange
Mains frequency fluctuation has insensitivity, using DC link interconnection AC power grid, in the flexible economy for guaranteeing interacted system
On the basis of property, the generation of system cascading failure can be effectively reduced, improve the Ability of Resisting Disturbance of interacted system.
Currently, having there is some electrical power company to attempt using Traditional DC technology of transmission of electricity (LCC-HVDC) to what is disturbed
System carries out power support and frequency stabilization control.When LCC-HVDC trend reverse phase controls, reverse voltage polarity is needed, is limited
The ability of its frequency control.Flexible DC transmission technology (VSC-HVDC) based on voltage source converter has fast power anti-
To ability, active power and reactive power independent control and can connect many advantages such as weak AC network at black starting-up, can be improved
Interacted system mutually supports the flexibility of the spare complementation of ability and region.
Since direct current transportation has quickly accurate frequency response ability, frequency is carried out to AC network by direct current transportation
Fast power support may be implemented in failure, guarantee the transient security of AC network for control；It, can be by altogether when steady-state operation
The mode for enjoying system reserve capacity reduces system and has spare capacity by oneself, significantly improves systematic economy benefit.By taking American electricity Grids as an example,
Thirdly bulk power grid (WECC, EI and ERCOT), which is based on history power supply, cuts off accident information, the requirement of system hot standby capacity is respectively
2740MW, 4500MW and 2750MW.After DC link is added, it is assumed that every DC link can transmit the urgent power of 900MW
It supports, then the system hot standby capacity of each power grid can reduce 1800MW.In view of the utilization spare appearance of DC link shared system
The economy of amount, Pacific Northwest National Laboratory (The Pacific Northwest National Laboratory)
Exploring the feasibility for carrying out frequency stabilization control to north American power grid using Multi-end flexible direct current transmission.
In recent years, the existing related research that the control of interacted system frequency stabilization is carried out using direct current transportation both at home and abroad.Document
Proposing one kind may be implemented frequency response, connects different type load and renewable energy and improves energy trading efficiency
Multipurpose DC network.Understand according to inventor, exists in existing literature based on the additional frequency control strategy locally controlled, with reality
Now when larger frequency fluctuation occurs for an AC system, remaining AC system carries out power support to it.However, when accident
Emergency DC power support is only a part of system frequency recovery process, and the recovery of system frequency is a complicated process.Mesh
Preceding domestic and international research focuses primarily upon the dc power after disturbance occurs and supports response, and how is direct current system after supporting for power
The Collaborative Control carried out effectively, economic with AC system rarely has research.
Summary of the invention
The present invention to solve the above-mentioned problems, proposes a kind of direct current interacted system frequency Emergency Assistance and fast quick-recovery control
Method and system processed, the present invention can be realized emergency DC power support when accident, the frequency variation after reducing AC system accident
Amount；Continue to participate in system frequency recovery process after accident, plays the role of stable frequency and acceleration system frequency retrieval.
To achieve the goals above, the present invention adopts the following technical scheme that：
A kind of direct current interacted system frequency Emergency Assistance and quick recovery control method, after electric system is disturbed,
It carries out to support control as the direct-current emergency of control amount using two sides frequency departure amount, and frequency stabilization identification is added, until
The frequency fluctuation of DC link two sides AC system is respectively less than its setting value, keeps quantity of power on current DC link not
Become, carries out frequency correction control, the power regulation to outside the system amount of imports, correction current system frequency and systematic steady state frequency
Departure be more than allowed band side system frequency, when system reaches minimum safe running frequency, start frequency modulation frequency modulation
Control realizes that system running frequency quickly recovers to steady-state operation frequency to system frequency non differential regulation.
Further, direct-current emergency supports control while responding the frequency variation feelings of DC link two sides AC system
Condition adjusts DC contact linear heat generation rate at any time；By the way that different frequency departure dead zone and control slope is arranged, system is exchanged for two sides
The different situation of system fm capacity, the responding ability that separately adjustable two sides converter station fluctuates other side AC system frequency,
While guaranteeing the safe operation of this top-cross streaming system, emergency DC power support is provided to opposite side AC system, prevents support system
It unites and provides the case where supporting more than itself spare capacity power to system of receiving aid.
Further, after system frequency tends towards stability, DC link keeps current DC control amount；And frequency is added
Stablize identification control, DC link is made to automatically keep the quantity of power on current DC link after system frequency is stablized.
Further, in frequency stabilization identification control process, by the frequency one for monitoring the connected AC system in direct current station
Subderivative variation judges that system frequency fluctuates situation, and the frequency targets derivative value is according to the reality of two side system of DC link
Border situation is adjustable；When the frequency fluctuation of DC link two sides AC system is respectively less than its setting value, current direct current is kept
Quantity of power on interconnection is constant.
Further, it if system is disturbed again, is identified by frequency stabilization, when frequency fluctuation is greater than frequency targets
Derivative setting value, direct-current emergency supports control will intervene stable AC system frequency again.
Further, it if the frequency after one side system of DC link is stablized is more than safe operation frequency range, controls
System will input an excess power regulated quantity to system, correct the side system frequency, continue to be increased to safety frequency limit value.
Further, in frequency correction control process, the safety frequency of setting and the bias target of systematic steady state frequency
In value, then the frequency margin of setting is subtracted, to guarantee that frequency can be stablized in minimum safe running frequency.
Further, restore to control using direct current frequency modulation, so that DC link continues to participate in secondary system frequency modulation control
System determines DC link representative difference coefficient in systems, the power generation according to difference coefficient to frequency modulation frequency modulation is participated in
The product moment that machine carries out non differential regulation is adjusted.
Further, the difference coefficient is that current frequency and the perunit value and dc power of system frequency deviation amount are inclined
The ratio of residual quantity perunit value.
A kind of direct current interacted system frequency Emergency Assistance and fast quick-recovery control system, including primary frequency modulation controller and two
Secondary frequency modulation control device, wherein：
Primary frequency modulation controller includes that direct-current emergency supports controller, frequency stabilization identification controller and frequency correction control
Device is configured as：It puts into operation when unusual fluctuations occurs in system frequency, direct-current emergency support controller, which starts to by disturbance, is
System provides emergency DC power support；Frequency stabilization identification controller identifies DC link two sides frequency in real time；When route two sides frequency
After rate is stable, frequency stabilization identification controller issues signal, and keeping direct-current emergency to support, to control current DC control amount constant,
Initiation culture correcting controller simultaneously；When system reaches minimum safe running frequency, DC link exits primary frequency modulation control
System；
Frequency modulation frequency modulation controller, be configured as when direct current frequency modulation restore control receive enabling signal, by with system itself
The cooperation of frequency modulation machine group, realizes system frequency non differential regulation, system running frequency is quickly recovered to steady-state operation frequency.
Compared with prior art, beneficial effects of the present invention are：
1, the present invention is able to achieve seam inspection, guarantees product quality, and can improve behaviour by changing pass partition structure
The problems such as making the operating environment of personnel, achieves many things at one stroke.
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 that fault visual is notified to exemplary diagram；
Fig. 2 is network security topological diagram；
Fig. 3 is sphere distance between two points schematic diagram；
Fig. 4 is the catadioptric that the fault traveling wave in cable run occurs for failure；
Fig. 5 is the catadioptric that the fault traveling wave in overhead transmission line occurs for failure；
Fig. 6 is algorithm routine flow chart；
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 the present invention, term for example "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", " side ",
The orientation or positional relationship of the instructions such as "bottom" is to be based on the orientation or positional relationship shown in the drawings, only to facilitate describing this hair
Bright each component or component structure relationship and the relative of determination, not refer in particular to either component or element in the present invention, cannot understand
For limitation of the present invention.
In the present invention, term such as " affixed ", " connected ", " connection " be shall be understood in a broad sense, and indicate may be a fixed connection,
It is also possible to be integrally connected or is detachably connected；It can be directly connected, it can also be indirectly connected through an intermediary.For
The related scientific research of this field or technical staff can determine the concrete meaning of above-mentioned term in the present invention as the case may be,
It is not considered as limiting the invention.
The present embodiment is described in detail from the following aspects：
(1) a kind of direct-current emergency support control is provided, so that DC link participates in system primary frequency modulation, less exchange
Frequency variation after systematic failures.
(2) it to make DC link automatically keep the quantity of power on current DC link after system frequency is stablized, mentions
A kind of frequency stabilization identification control out, the control starting Emergency Assistance can be controlled when system frequency changes, and steady in frequency
Frequency oscillation is prevented after fixed.
(3) after stablizing in order to ensure system frequency, stable frequency in safe range, proposes a kind of frequency correction control
System, guarantees that system operates within the scope of safety frequency.
(4) in order to improve secondary system frequency modulation speed, propose that a kind of direct current frequency modulation restores control, so that DC link exists
After the control of participation system primary frequency modulation, secondary system frequency modulation control is continued to participate in.
As shown in Figure 1, being the overall process of frequency control response after the system provided is disturbed.In the power system, electric
The frequency of net reflects the equilibrium relation between generated output and load, is the important control parameter of Operation of Electric Systems.Electric power
System frequency control is considered as one of most important auxiliary control.It is controlled by frequency, system frequency can be existed with stable operation
In acceptable safe range.Frequency control after electric system is disturbed can generally be divided into two stages：Primary frequency modulation
Control and frequency modulation frequency modulation control.
Primary frequency modulation control belongs to em ergency power support control.(fallen after system is disturbed with internal system generator
For standing), primary frequency modulation control changes prime mover power output by governor, using itself fm role of generator in system, subtracts
Few mains frequency variation.Currently, the online spare capacity of domestic power grid is mainly based on coal fired power generation machine.Due to coal unit spy
Property limitation, regulating power is relatively poor, and the time for reaching target load is longer.When system is by big disturbance, system transient modelling
Frequency too low may lead to low-frequency load shedding, threaten system safe and stable operation.Meanwhile primary frequency modulation control is to system spinning reserve
Capacity requirement is higher, and when normal operation reduces systematic economy benefit.Secondary system frequency modulation control belongs to frequency retrieval control.When
It after primary frequency modulation controls, is controlled by frequency modulation frequency modulation, generally uses AGC mode, gradually restore stabilization of power grids frequency.At present
Frequency modulation frequency modulation control generally requires 3 to 15 minutes from completion frequency retrieval is participated in, and during this period of time, system is in non-specified
Frequency operation, frequency modulated time is longer, and the influence caused to equipment safety economical operation is bigger.
It is participated in the control of system primary frequency modulation using direct current transportation, when stable operation, system spinning reserve can be reduced,
Improve operation benefit；After system is disturbed, fast power support is carried out using direct current transportation, it is steady to improve system transient modelling
It is qualitative.After system is stablized, is participated in secondary system frequency modulation control using direct current transportation, the fast quick-recovery of frequency may be implemented,
The non-rated frequency operating condition runing time of reduction system.
As shown in Fig. 2, for direct current frequency proposed in this paper support and recovery control method.Direct current frequency supports and restores to control
Strategy processed specifically includes following sections：(1) direct-current emergency supports control, the identification of (2) frequency stabilization, the control of (3) frequency correction
And (4) direct current frequency modulation restores control.Wherein, direct-current emergency is supported control, frequency stabilization identification and frequency correction control and is corresponded to
The control of system primary frequency modulation is referred to as direct current frequency and supports control；Direct current frequency modulation restores control correspondence system frequency modulation frequency modulation control.
Direct-current emergency supports control using the frequency variation after reducing AC system accident as target.In traditional converter station
In, direct current frequency control mostly uses fixed proportionality coefficient, the opposite side AC system fm capacity for participating in frequency modulation is not considered, this
Cause during dc power is supported, relatively large deviation may occur for opposite side AC system frequency, influence the peace of its own
Full stable operation.To avoid the problem, herein using two sides frequency departure amount as control amount.
As shown in figure 3, the direct-current emergency to propose supports the controller architecture of control.In figure, frefiFor systematic steady state frequency
Rate, fi are system actual frequency, and Ki indicates the adjusting slope of active-frequency, fdeadbandFor frequency departure dead zone, i=1 or 2,
Pmax/PminFor the active power controller upper limit/lower limit, PfecyThe active power value of control output is supported for direct-current emergency.
Assuming that two side system of DC link is system one and system two.Frequency is caused to reduce when system one is disturbed,
There is uneven frequency in system one, is supported and is controlled by direct-current emergency, and DC contact linear heat generation rate will be changed to：
PDC=Pref+K1*(fref1-f1) (1)
System two will provide additional power to system one with stability series unified frequency.At this point, there is imbalance in system two
Power, frequency will also decrease, and DC contact linear heat generation rate is at this time：
PDC=Pref+K1*(fref1-f1)+K2*(fref2-f2) (2)
By (1) and (2) formula it is found that direct-current emergency supports control can respond DC link two sides AC system simultaneously
Frequency situation of change adjusts DC contact linear heat generation rate at any time.By the way that different frequency departure dead zone and control slope is arranged, for
AC system fm capacity different situation in two sides can fluctuate other side AC system frequency with separately adjustable two sides converter station
Responding ability, guarantee this top-cross streaming system safe operation while, to opposite side AC system provide emergency DC power support, prevent
Only there is support system to provide to system of receiving aid being more than the case where itself spare capacity power is supported.
The purpose that direct-current emergency supports control is the frequency variation reduced after AC system accident.When system frequency tends to
After stabilization, DC link should keep current DC control amount.To protect DC link automatically after system frequency is stablized
The quantity of power on current DC link is held, on the basis of direct-current emergency is supported and controlled, joined frequency stabilization identification control
Device.
As shown in figure 4, being the structure of frequency stabilization identification controller.In figure, f is system actual frequency, f 'setFor frequency
Target derivative, signal are the signal of controller output after frequency stabilization.Controller connects exchange system by monitoring direct current station
The frequency first order derivative of system changes, and judges that system frequency fluctuates situation.Since systematic steady state frequency still has small range fluctuation, root
According to the actual conditions of two side system of DC link, settable different frequency targets derivative value.When two top-cross of DC link
When the frequency fluctuation of streaming system is respectively less than its setting value, controller issues signal, keeps the quantity of power on current DC link
It is constant.
Frequency stabilization identification control can identify the frequency fluctuation situation of two side systems simultaneously, it is ensured that two side systems are stable
It exits direct-current emergency again afterwards and supports control.Meanwhile if system is disturbed again, is identified by frequency stabilization, work as frequency wave
Dynamic to be greater than frequency targets derivative setting value, direct-current emergency supports control will intervene stable AC system frequency again.
In some cases, it since internal system generator speed regulation capacity is insufficient, is controlled although being supported by direct-current emergency
Reduce AC system frequency variable quantity, but is still likely to occur the frequency after system is stablized not in safe operation frequency range
The case where.Currently, the frequency departure limit value under China's electric system normal operation is no more than ± 0.2HZ.In order to guarantee to be
System is in safe operation frequency range after stablizing, and after system frequency is stablized, joined frequency correction control.
As shown in figure 5, for the controller architecture of frequency correction control.ΔfsafeFor safety frequency fsafeWith systematic steady state frequency
Rate frefBias target value, Δ Psafe-MWFor the power regulation exported after frequency correction control.
As shown in figure 5, frequency correction control will enable and judge current system frequency and system after system frequency is stablized
Within the allowable range whether the departure of steady frequency.If the frequency after one side system of DC link is stablized is more than safety fortune
Line frequency range, then control will input an excess power regulated quantity Δ P to systemsafe-MW, the side system frequency is corrected, it is made
Continue to rise to safety frequency limit value.
ΔPsafe-MW=K3*(Δf1-Δfsafe1)+K4*(Δf2-Δfsafe2) (3)
Since there may be control output quantities and setting minimum safe running frequency value there are problems that deviation for control system.
Therefore, on the basis of the minimum safe running frequency of setting, increase a frequency margin δ, frequency can be steady after guaranteeing control
It is scheduled on minimum safe running frequency：
Δfsafe=fref-fsafe-δ (4)
Frequency correction control can judge the frequency situation after two side system of DC link stabilization simultaneously, it is ensured that two side-lines
The safe and stable operation of system.Frequency correction controls the signal enabling identified by frequency stabilization, avoids and supports in direct-current emergency
It is run simultaneously when control, influences direct-current emergency and support control.
The control of system primary frequency modulation belongs to droop control, after system controls stable frequency by primary frequency modulation, frequency
Generally there are certain differences with steady-state operation frequency.In order to make system frequency be restored to steady-state operation frequency, system two is needed
Secondary frequency modulation control.In order to make system be restored to nominal operating frequency as early as possible, the control of system primary frequency modulation is participated in DC link
Afterwards, restore to control using direct current frequency modulation, continue to participate in secondary system frequency modulation control, improve secondary system frequency modulation speed.
Consider that DC link participates in secondary system frequency modulation, should determine DC link representative tune in systems
Poor coefficient.According to electric system frequency modulation frequency modulation characteristic, difference coefficient KDCIt is represented by：
Wherein, Δ f* is the perunit value of current frequency and system frequency deviation amount；ΔPDCIt * is dc power departure perunit
Value；Δ f is current frequency and system frequency deviation amount；f0For systematic steady state frequency；ΔPDCFor power deviation amount；PDC0For the change of current
It stands capacity.
Assuming that the generator that the internal system being disturbed has n platform to participate in frequency modulation frequency modulation, using the product moment of non differential regulation
Adjusting method considers that direct current participates in frequency modulation frequency modulation, then has：
Wherein, Δ f* is current frequency and system frequency deviation amount perunit value；ΔPGiIt * is the active of i-th of frequency modulation unit
Power variation perunit value；KGiFor the difference coefficient of the static regulator of the i-th frequency modulation unit.
Direct current frequency modulation restores control and participates in secondary system frequency modulation control, and system frequency modulation equation is：
Wherein, Δ P* is power incrementss perunit value needed for recovery system steady frequency.
Assuming that each dot frequency is consistent in system, then the frequency integrator ∫ Δ f*dt of each unit may be considered equal.
Then have：
Then in secondary system frequency modulation, the perunit value for the secondary system frequency modulation power that DC link is undertaken is：
Wherein, KSecondaryRestore control power partition coefficient for direct current frequency modulation：
As shown in fig. 6, the direct current frequency to be proposed supports and restores control strategy master controller structure.Work as system frequency
There is unusual fluctuations, the control intervention of system primary frequency modulation.It is provided tightly at this point, direct-current emergency supports control starting to by perturbed system
Anxious power is supported.Meanwhile frequency stabilization identification controller identifies DC link two sides frequency in real time.When route two sides, frequency is equal
After stabilization, frequency stabilization identification controller issues signal, keeps the current DC control amount of direct-current emergency support control constant, simultaneously
Initiation culture Corrective control.When system reaches minimum safe running frequency, DC link exits primary frequency modulation control, system
Primary frequency modulation control terminates.
When secondary system frequency modulation control starting after, direct current frequency modulation restore control receives enabling signal, by with system itself
The cooperation of frequency modulation machine group, realizes system frequency non differential regulation, system running frequency is quickly recovered to steady-state operation frequency.
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 (10)
1. a kind of direct current interacted system frequency Emergency Assistance and quick recovery control method, it is characterized in that：When electric system by
After disturbance, carry out to support control as the direct-current emergency of control amount using two sides frequency departure amount, and frequency stabilization knowledge is added
Not, it until the frequency fluctuation of DC link two sides AC system is respectively less than its setting value, keeps on current DC link
Quantity of power is constant, carries out frequency correction control, and the power regulation to outside the system amount of imports corrects current system frequency and system
The departure of steady frequency is more than the side system frequency of allowed band, when system reaches minimum safe running frequency, starting
Frequency modulation frequency modulation control realizes that system running frequency quickly recovers to steady-state operation frequency to system frequency non differential regulation.
2. a kind of direct current interacted system frequency Emergency Assistance as described in claim 1 and quick recovery control method, feature
It is：Direct-current emergency supports control while responding the frequency situation of change of DC link two sides AC system, adjusts direct current at any time
Dominant eigenvalues；By the way that different frequency departure dead zone and control slope is arranged, for two sides AC system fm capacity difference
The case where, the responding ability that separately adjustable two sides converter station fluctuates other side AC system frequency is guaranteeing this top-cross stream system
While system safe operation, emergency DC power support is provided to opposite side AC system, support system is prevented and is mentioned to the system of receiving aid
For being more than the case where itself spare capacity power is supported.
3. a kind of direct current interacted system frequency Emergency Assistance as described in claim 1 and quick recovery control method, feature
It is：After system frequency tends towards stability, DC link keeps current DC control amount；And frequency stabilization identification control is added,
DC link is set to automatically keep the quantity of power on current DC link after system frequency is stablized.
4. a kind of direct current interacted system frequency Emergency Assistance as described in claim 1 and quick recovery control method, feature
It is：Frequency stabilization identifies in control process that the frequency first order derivative by monitoring the connected AC system in direct current station changes, judgement
System frequency fluctuates situation, and the frequency targets derivative value is adjustable according to the actual conditions of two side system of DC link；When
When the frequency fluctuation of DC link two sides AC system is respectively less than its setting value, the quantity of power on current DC link is kept
It is constant.
5. a kind of direct current interacted system frequency Emergency Assistance as described in claim 1 and quick recovery control method, feature
It is：If system is disturbed again, identified by frequency stabilization, when frequency fluctuation be greater than frequency targets derivative setting value, directly
Stream Emergency Assistance control will intervene stable AC system frequency again.
6. a kind of direct current interacted system frequency Emergency Assistance as described in claim 1 and quick recovery control method, feature
It is：If the frequency after one side system of DC link is stablized is more than safe operation frequency range, control will be inputted to system
One excess power regulated quantity corrects the side system frequency, continues to be increased to safety frequency limit value.
7. a kind of direct current interacted system frequency Emergency Assistance as described in claim 1 and quick recovery control method, feature
It is：In frequency correction control process, in the safety frequency of setting and the bias target value of systematic steady state frequency, then setting is subtracted
Frequency margin, to guarantee that frequency can be stablized in minimum safe running frequency.
8. a kind of direct current interacted system frequency Emergency Assistance as described in claim 1 and quick recovery control method, feature
It is：Restore to control using direct current frequency modulation, so that DC link continues to participate in secondary system frequency modulation control, determines DC contact
Line representative difference coefficient in systems, carries out non differential regulation to the generator for participating in frequency modulation frequency modulation according to difference coefficient
Product moment is adjusted.
9. a kind of direct current interacted system frequency Emergency Assistance as claimed in claim 8 and quick recovery control method, feature
It is：The difference coefficient is current frequency and the perunit value of system frequency deviation amount and the ratio of dc power departure perunit value
Value.
10. a kind of direct current interacted system frequency Emergency Assistance and fast quick-recovery control system, it is characterized in that：Including primary frequency modulation control
Device and frequency modulation frequency modulation controller processed, wherein：
Primary frequency modulation controller includes that direct-current emergency supports controller, frequency stabilization identification controller and frequency correction controller,
It is configured as：It puts into operation when unusual fluctuations occurs in system frequency, direct-current emergency is supported controller and started to by perturbed system
Emergency DC power support is provided；Frequency stabilization identification controller identifies DC link two sides frequency in real time；When route two sides frequency
After stable, frequency stabilization identification controller issues signal, and keeping direct-current emergency to support, to control current DC control amount constant, together
When initiation culture correcting controller；When system reaches minimum safe running frequency, DC link exits primary frequency modulation control；
Frequency modulation frequency modulation controller, be configured as when direct current frequency modulation restore control receive enabling signal, by with system itself frequency modulation
Unit cooperation, realizes system frequency non differential regulation, system running frequency is quickly recovered to steady-state operation frequency.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111654040A (en) * | 2020-06-17 | 2020-09-11 | 浙江大学 | Frequency supporting method of interconnected power system containing HVDC (high voltage direct current) with consideration of support of transmitting end and receiving end |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111654040A (en) * | 2020-06-17 | 2020-09-11 | 浙江大学 | Frequency supporting method of interconnected power system containing HVDC (high voltage direct current) with consideration of support of transmitting end and receiving end |
| CN113013930A (en) * | 2021-03-04 | 2021-06-22 | 山东大学 | Secondary frequency modulation control method and system for flexible direct current delivery of virtual power plant |
| CN113013930B (en) * | 2021-03-04 | 2022-03-11 | 山东大学 | Secondary frequency modulation control method and system for flexible direct current delivery of virtual power plant |
| CN113241778A (en) * | 2021-05-25 | 2021-08-10 | 云南电网有限责任公司电力科学研究院 | AGC control method based on multi-region interconnected power grid |
| CN113452039A (en) * | 2021-07-16 | 2021-09-28 | 云南电网有限责任公司电力科学研究院 | Frequency modulation method and system for new energy station |
| CN113452039B (en) * | 2021-07-16 | 2023-05-26 | 云南电网有限责任公司电力科学研究院 | Frequency modulation method and system for new energy station |
| CN113422377A (en) * | 2021-08-25 | 2021-09-21 | 中国电力科学研究院有限公司 | DC modulation and secondary frequency modulation coordinated optimization configuration method and device |
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