CN106505607B - A kind of multiple-circuit line additional frequency restriction controller control method - Google Patents
A kind of multiple-circuit line additional frequency restriction controller control method Download PDFInfo
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Abstract
The embodiment of the invention discloses a kind of multiple-circuit line additional frequency restriction controller control methods, are suitable for the multiple-circuit line system of Asynchronous Interconnection sending end, and step includes default regulation and control initial frequency threshold value Δ fonFrequency threshold Δ f is terminated with regulation and controloff；Frequency deviation f is calculated, whether determination frequency deviation delta f is more than regulation and control initial frequency threshold value Δ fon；If so, for the multiple-circuit line of Asynchronous Interconnection, the transmission power of each time direct current is rationally set by " staged " control strategy.The embodiment of the invention discloses a kind of multiple-circuit line additional frequency restriction controller control methods, by " staged " control strategy, multiple-circuit line additional frequency limiter is rationally set, can orderly it regulate and control stage by stage, step by step during frequency is soaring, avoid in the case of power grid accident each direct current FLC simultaneously, unordered regulation and control action lead to overshoot, it is ensured that the controllability of direct current regulation and control.
Description
Technical field
The present invention relates to electric power system stability control technical fields, are limited more particularly to a kind of multiple-circuit line additional frequency
Controller control method.
Background technology
HVDC transmission system has the advantage of large capacity, long distance power transmission, currently, in China " transferring electricity from the west to the east " engineering
The high voltage direct current power transmission mode in parallel with AC system is used.Under AC/DC parallel mode, the alternating current-direct current system in power grid
System will generate reciprocal influence, and even straight-flow system breaks down, then AC system will also be affected.In order to avoid because straight
Stream failure causes ac and dc systems to influence each other and causes power grid accident, can two or more power grids be carried out Asynchronous Interconnection, example
Such as, China will realize the Asynchronous Interconnection of Yunnan Power System and south electric network.
Under power grid Asynchronous Interconnection mode, if direct current, which occurs, is latched failure, the frequency stabilization problem of sending end power grid is very prominent
Go out, there are the risks that frequency regulation and control lead to mains breakdown.Currently, its measure solved includes mainly that sending end unit primary frequency modulation is dynamic
Make, machine measure is cut in steady control, high week cuts machine measure, direct-current emergency power is supported and the limitation control of direct current additional frequency
(frequency limit control, FLC) etc..Wherein, the time constant of sending end unit primary frequency modulation action is larger, in short-term
The interior mitigation to system power excess quantity is extremely limited, therefore system frequency still can comparatively fast rise.Machine and height week are cut in steady control
Security perimeter of the machine measure as power grid is cut, when the locking of direct current monopole occurs, is pressed《Guiding rules of power system safety and stability》Do not permit
Permitted to take corresponding measure, and its action effect is limited by stability control device and information exchange transmission with certain " lag " property,
Inhibit cost larger (needing to cut off larger capacity unit) mains frequency in the case where high-capacity direct current sends out failure mode.Direct current is tight
Anxious power, which is supported, to be alleviated according to the transmission power of dc power regulating command fast lifting non-faulting direct current and send receiving-end system
Unbalanced power, but promoted dc power amount be to be adjusted based on forecast accident, can not according to running situation into
Row is adjusted.
Direct current additional frequency limitation control (hereinafter referred direct current FLC) is similar with the support of direct-current emergency power, will be in system
(or reduction) DC line transmission power is quickly promoted when frequency departure is more than certain certain value, is closed with reducing direct current as far as possible
Sending power surplus amount caused by lock alleviates the unstable of the high frequency in network system, improves the stability of network system；
But difference lies in, direct current FLC to adjust dc power reference value according to the real-time frequency deviation of sending end power grid for the two,
Control mode is more effective, flexible.Therefore, current DC transmission system polygamy has FLC.DC transmission system equipped with FLC
Can be equivalent regard as one have fm capacity and the faster heavy-duty generator group of governing speed, can quickly improve sending end
System resists the ability of power disturbance, enhances sending frequency stability, while it is adjustable online also to carry out multiple-circuit line FLC
Coordinated Control Scheme.
But direct current FLC is confined to the application in single time direct current islet operation, or needed because the coordination of multiple-circuit line controls
Writing to each other between more straight-flow systems and regional power grid control system is established, and dynamic changes parameter due to power grid security is examined
Do not have exploitativeness, therefore, for the sending end power grid of Asynchronous Interconnection, when direct current locking occurs, each time direct current FLC is simultaneously by each
Direct current maximum ability of regulation and control " do something in a confused manner " formula regulation and control action, lead to system power overshoot.
Invention content
A kind of multiple-circuit line additional frequency restriction controller control method is provided in the embodiment of the present invention, it is existing to solve
Each time direct current FLC " does something in a confused manner " regulation and control actions the problem of leading to system power toning of formula in technology.
In order to solve the above-mentioned technical problem, the embodiment of the invention discloses following technical solutions：
A kind of multiple-circuit line additional frequency restriction controller control method, including,
The regulation and control initial frequency threshold value Δ f of step S1, predetermined DC FLConFrequency threshold Δ f is terminated with regulation and controloff；
Step S2 monitors the real-time frequency f of sending end power grid, and according to real-time frequency f and steady frequency f0, it is inclined to calculate frequency
Poor Δ f, i.e. Δ f=f-f0；
Step S3, judges whether the frequency deviation f is more than the regulation and control initial frequency threshold value Δ fon；
Step S31：If so, by the transmission power of straight-flow system by specified transmission power P0It is adjusted to preset high load capacity
Transmission power PS1, wherein the high load capacity transmission power PS1For specified transmission power P0The preset multiple of overload in short-term K1
Times, i.e. PS1=K1P0；
Step S4：Straight-flow system is with high load capacity transmission power PS1It, will be straight after the preset time limit t of overload in short-term of continuous service
The transmission power of streaming system is by the high load capacity transmission power PS1It is adjusted to the specified transmission power P of preset underloadS2, wherein
The underload transmission power PS2For specified transmission power P0Preset long-term overload multiple K2Times, i.e. PS2=K2P0；
Step S5：The frequency deviation f of monitoring sending end power grid in real time, and whether determination frequency deviation delta f is less than the tune
Control terminates frequency threshold Δ foff；
Step S51：If so, by the transmission power of straight-flow system by the underload transmission power PS2It is adjusted to the volume
Determine transmission power P0。
Preferably, further include determining control parameter before step S1, the control parameter includes overload multiple in short-term
K1, it specifically includes,
According to the peak load multiple K of straight-flow systemm, multigroup pre-selection overload multiple K in short-term is set10, wherein K10＜
Km；
Make straight-flow system respectively in each group of pre-selection overload multiple K in short-term10Corresponding high load capacity transmission power PS10Lower fortune
Row, wherein PS10=K10P0, and obtain the temporary active power of straight-flow system；
Judge each group of pre-selection overload multiple K in short-term1Whether corresponding temporary active power is equal to pre-selection mistake in short-term
Load multiple K10Corresponding high load capacity transmission power PS10；
If so, by preselected group overload multiple K in short-term10It is set as alternative overload multiple in short-term；
Alternatively select in overload multiple in short-term the maximum alternative overload multiple in short-term of numerical value as overload in short-term
Multiple K1。
Preferably, regulation and control terminate frequency threshold Δ foffFor the frequency fluctuation range under sending end power grid normal operating mode.
Preferably, regulation and control initial frequency threshold value Δ fonMore than the frequency fluctuation range under sending end power grid normal operating mode.
By above technical scheme as it can be seen that provided in an embodiment of the present invention the embodiment of the invention discloses a kind of multiple-circuit line is attached
Add Frequency limit controller control method, be suitable for the multiple-circuit line system of Asynchronous Interconnection sending end, plan is controlled by " staged "
Slightly reasonable setting multiple-circuit line additional frequency limiter can orderly regulate and control during frequency is soaring, avoid stage by stage, step by step
" do something in a confused manner " of each direct current FLC regulation and control, which acts, in the case of power grid accident leads to overshoot, ensured to direct current regulate and control can
Control property.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, for those of ordinary skill in the art
Speech, without creative efforts, other drawings may also be obtained based on these drawings.
Fig. 1 is that a kind of flow of multiple-circuit line additional frequency restriction controller control method provided in an embodiment of the present invention is shown
It is intended to；
Fig. 2 is each time direct current FLC control parameters setting figure of Yunnan Power System.
Specific implementation mode
In order to make those skilled in the art more fully understand the technical solution in the present invention, below in conjunction with of the invention real
The attached drawing in example is applied, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described implementation
Example is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is common
The every other embodiment that technical staff is obtained without making creative work, should all belong to protection of the present invention
Range.
When direct current locking failure causes Asynchronous Interconnection sending high frequency occur, i.e., system frequency deviation is more than that certain is certain
When value, non-faulting direct current FLC will use " staged " method that direct current FLC control strategies are arranged, first by the conveying work(of straight-flow system
Rate is adjusted to high load capacity transmission power, and within a short period of time, the transmission power of fast lifting DC line rapidly reduces direct current
Sending power surplus amount caused by locking；Then, the transmission power of straight-flow system is adjusted to underload transmission power, with
The excess power of one more steady, safety rate conveying sending；Finally, the high frequency problem for effectively alleviating system, from
And improve system stability.
Fig. 1 is that a kind of flow of multiple-circuit line additional frequency restriction controller control method provided in an embodiment of the present invention is shown
It is intended to, as shown in Figure 1, a kind of Asynchronous Interconnection sending end multiple-circuit line additional frequency restriction controller control method, including：
The regulation and control initial frequency threshold value Δ f of step S1, predetermined DC FLConFrequency threshold Δ f is terminated with regulation and controloff。
Regulate and control initial frequency threshold value Δ fon, for the frequency threshold that direct current FLC functions start, i.e., ought detect sending end power grid
Frequency departure is more than this regulation and control initial frequency threshold value Δ fonWhen, direct current FLC functions start, and adjustment direct current transmission power amount is specified
The K of transmission power1Times (overload multiple in short-term), and (overload time limit in short-term) when continuous service t.
Network system is in normal course of operation, and the frequency of sending end power grid will be fluctuated in certain Near Threshold, to avoid
When sending end mains frequency deviation is when this Near Threshold fluctuates, the malfunction of direct current FLC functions input and state out of service it
Between frequent switching problem, regulation and control initial frequency threshold value Δ fonSelection should can avoid the frequency under system normal operating mode
Fluctuation range.In the present embodiment, the frequency fluctuation ranging from 0.05Hz under sending end power grid normal operating mode, the tune of direct current FLC
Control initial frequency threshold value Δ fonMore than the frequency fluctuation range under sending end power grid normal operating mode, such as 0.1Hz.
Regulation and control terminate frequency threshold Δ foff, for the frequency threshold that direct current FLC function controllings terminate, that is, detect sending end electricity
The frequency departure of net is less than a certain threshold value Δ foffWhen, adjustment direct current transmission power amount is nominal operation power, completes direct current FLC
To the regulatory function of DC transmission system.
In normal course of operation, sending end mains frequency will fluctuate network system in certain Near Threshold, therefore, when sending
Hold the frequency departure of power grid when this Near Threshold fluctuates, you can to assert that network system has restored stable, direct current FLC functions
State out of service.In the present embodiment, regulation and control terminate frequency threshold Δ foffFor the frequency wave under sending end power grid normal operating mode
Dynamic range, such as 0.05Hz.
Step S2 monitors the real-time frequency f of sending end power grid, and according to real-time frequency f and steady frequency f0, it is inclined to calculate frequency
Poor Δ f, i.e. Δ f=f-f0。
Whether step S3, determination frequency deviation delta f are more than regulation and control initial frequency threshold value Δ fon。
Step S31：If so, by the transmission power of straight-flow system by specified transmission power P0It is adjusted to preset high load capacity
Transmission power PS1, wherein high load capacity transmission power PS1For specified transmission power P0The preset multiple of overload in short-term K1Times, i.e.,
PS1=K1P0。
Step S4：Straight-flow system is with high load capacity transmission power PS1It, will be straight after the preset time limit t of overload in short-term of continuous service
The transmission power of streaming system is by high load capacity transmission power PS1It is adjusted to the specified transmission power P of preset underloadS2, wherein it is low negative
Lotus transmission power PS2For specified transmission power P0Preset long-term overload multiple K2Times, i.e. PS2=K2P0。
Step S5：The frequency deviation f of monitoring sending end power grid in real time, and whether determination frequency deviation delta f is less than regulation and control eventually
Only frequency threshold Δ foff。
Step S51：If so, by the transmission power of straight-flow system by underload transmission power PS2It is adjusted to specified conveying work(
Rate P0。
Further include determining control parameter before step S1, control parameter includes overload multiple K in short-term1, long-term overload
Multiple K2And the time limit t of overload in short-term.Influence of the different control parameters to system frequency stability is different, in order to be arranged rationally
Control parameter, in the present embodiment, adjustment effect of the different control parameters to system frequency will be emulated, according to simulation result,
Determine preferable control parameter.In control parameter, overload multiple K in short-term1Influence of the selection to direct current FLC control effects
It is the most key, long-term overload multiple K2The selection influence of the time limit t of overload in short-term is relatively small, therefore, subsequently will
To overload multiple K in short-term1Selection process detailed discuss.
Overload multiple K in short-term1Selection mode there are many, in the present embodiment, selection be as follows：
According to the peak load multiple K of straight-flow systemm, multigroup pre-selection overload multiple K in short-term is set10, wherein K10＜
Km；
Make straight-flow system respectively in each group of pre-selection overload multiple K in short-term10Corresponding high load capacity transmission power PS10Lower fortune
Row, wherein PS10=K10P0, and obtain the temporary active power of straight-flow system；
Judge each group of pre-selection overload multiple K in short-term1Whether corresponding temporary active power is equal to pre-selection mistake in short-term
Load multiple K10Corresponding high load capacity transmission power PS10；
If so, by preselected group overload multiple K in short-term10It is set as alternative overload multiple in short-term；
Alternatively select in overload multiple in short-term the maximum alternative overload multiple in short-term of numerical value as overload in short-term
Multiple K1。
It will illustrate the selection course of control parameter for a single time straight-flow system below：
According to the peak load multiple of straight-flow system, two groups of control parameters are preset.It should be noted that overload multiple K in short-term1
Must not exceed the peak load multiple of streaming system, in this example, peak load multiple is 1.2, therefore, overload multiple K in short-term1
Selectable greatest measure is 1.2.First group of control parameter be：Overload multiple K in short-term1For 1.1, long-term overload multiple K2
It is 5s for 1.05 and the time limit t of overload in short-term；Second group of control parameter be：Overload multiple K in short-term1For 1.2, long-term overload
Multiple K2It is 5s for 1.1 and the time limit t of overload in short-term.
Influence of the control parameter that two groups of simulation analysis to DC system locking post-fault system frequency stability, emulation
As a result it is specially：Under the conditions of first group of control parameter, the temporary active power of the direct current conveying of non-faulting straight-flow system is equal to
The 1.1 corresponding high load capacity transmission power 1.1P of overload multiple in short-term0, 1.1 times of as specified transmission power.
Under the conditions of second group of control parameter, the temporary active power of the direct current conveying of non-faulting straight-flow system is short less than this
When overload multiple 1.2 corresponding high load capacity transmission power 1.2P0, i.e. the active power value of straight-flow system actual fed do not reach
To 1.2 times of preset nominal operation power.The reason is that non-faulting straight-flow system is under running overload state, directly
The reactive power of streaming system consumption is significantly increased, and the reactive capability that straight-flow system reactive-load compensation equipment provides is insufficient, causes direct current
Voltage has falling for certain amplitude, therefore straight-flow system conveying active power can not reach preset overload multiple.
It can be seen that a specific straight-flow system, the overload multiple after direct current FLC is put into addition to considering AC line
The multiple of overload in short-term on road itself and outside the time limit of overload in short-term also needs to consider the actual reactive reserve situation of straight-flow system,
It, could to greatest extent only under the premise of meeting no more than straight-flow system running overload ability and reactive power abundance
The effect of frequency stability during the performance direct current FLC additional controllers raising system failure, if the FLC controllers adjusted are excessively negative
Lotus operation multiple is too big, mismatches, then may cause instead with the reactive reserve situation or capability of overload of actual DC system
Idle not afc voltage is difficult to restore or damage straight-flow system equipment after the system failure.That is, single time direct current FLC controller
The multiple of overload in short-term K1 be not to be the bigger the better, when meeting straight-flow system running overload ability and reactive reserve premise
Under, it is intended that choose larger direct current it is too short when overload multiple K1, with preferably play straight-flow system capability of overload come
Reduce the power surplus amount after direct current locking, improves system frequency stability.
To sum up, using 1.1 times in short-term overload multiple with using 1.2 times in short-term overload multiple it is steady to system transient modelling frequency
Qualitative improvement difference very little, but using 1.2 times in short-term overload multiple when straight-flow system need to consume it is more idle
Power is unfavorable for the recovery of post-fault system voltage, therefore for direct current FLC controllers, first group of control parameter is relatively reasonable.
It will illustrate the selection course of control parameter for a multiple-circuit line system below：
By Yunnan Power System and south electric network Asynchronous Interconnection operation for, wherein Yunnan Power System include Chu Sui, general emigrant, Jin Zhong,
Forever rich and ox from etc. straight-flow systems, choose that Chu Sui, general emigrant, Jin Zhong, rich 4 times straight-flow systems put into FLC functions (ox is examined from direct current forever
Consider input emergency DC power support function, do not put into FLC functions).Multiple-circuit line Systematic selection control parameter is contemplated that direct current system
The overload transport capacity (being primarily limited to thyristor junction temperature and cooling water outlet temperature) of system, while being also contemplated that direct current system
Electrical distance (the main tide influenced after input direct current FLC between the nargin of the reactive compensation capacity of system and each straight-flow system
Circulation moves range size and then influences AC system reactive power consumption).
According to all kinds of factors of above-mentioned consideration, in conjunction with Yunnan Power System actual conditions, due to Chu Sui, Jin Zhong, forever rich three times it is straight
The mutual electrical distance of streaming system is closer, remaining 2 times direct current FLC function is put into after locking failure occurs for any time direct current
Caused system load flow transfer range is smaller, stablizes advantageously to the recovery of system, therefore consider it is contemplated that this 3 times direct currents
FLC uses larger overload multiple；In combination with each straight-flow system transmission capacity and voltage class, Chu Sui direct currents and general emigrant are straight
It is ± 800kV to flow voltage class, and transmission capacity has reached 5000MW, and straight-flow system running overload ability is stronger, and in gold
Direct current, rich DC voltage level is ± 500kV forever, and transmission capacity is respectively 3200MW and 3000MW, straight-flow system overload
Service ability is weaker.The each direct current FLC control parameters of Yunnan Power System are set in conjunction with above-mentioned several respects factor, Fig. 2 is Yunnan Power System
Each direct current FLC control parameters setting figure, as shown in Fig. 2, the overload multiple in short-term of each straight-flow system FLC controllers is arranged
K1, running overload time t and long-term overload multiple K in short-term2.For example, the multiple of the overload in short-term K of the general emigrant's direct current of setting1
For 1.10, running overload time t is 5s and long-term overload multiple K in short-term2It is 1.05.
Each time direct current FLC Controlling model parameter set according to fig. 2, to each Hui Zhi under Yunnan Power System typical operation modes
Streaming system introduces direct current FLC functions, frequency response situation of the emulation Yunnan Power System under DC system locking failure.According to emulation
As a result it is found that when Yunnan Power System occurs under direct current locking failure, remaining non-faulting straight-flow system can be according to the system that detects frequently
Rate deviation size, and direct current FLC functions are quickly put into, it is rapid to promote DC line transmission power, it plays to large extent straight
The capability of overload of streaming system reduces the power surplus amount in Yunnan Power System, and Yunnan under Asynchronous Interconnection mode is improved to play
The frequency stability of power grid.In the present embodiment, when detect sending end power grid frequency departure be more than preset regulation and control initial frequency
When threshold value 0.1Hz, conveying active power is quickly promoted to the corresponding mistake in short-term of specified transmission power by each straight-flow system
Load times, for example, conveying active power is promoted to 1.1 times of specified transmission power by general emigrant's direct current, at the first time by direct current system
Available running overload ability of uniting is for reducing system power excess quantity, and control mode is simple and practical and significant effect.
Certainly, overload multiple K in short-term1It is also an option that other selection modes, belong to the protection model of the present invention
It encloses.For example, the one initial multiple of overload in short-term K of selection1, emulate overload multiple K in short-term1To the adjustment effect of system frequency
Fruit judges this overload multiple K in short-term1Whether system frequency can be adjusted effectively；It, will overload multiple in short-term if can be with
K1Increase a preset step-length, judges the multiple of the overload in short-term K after increasing1Whether system frequency can be adjusted effectively；Directly
To overload multiple K in short-term1System frequency can not be effectively adjusted, then by the multiple of overload in short-term K at this time1Subtract one in advance
If step-length, as finally determine the multiple of overload in short-term K1。
After locking failure occurs for a certain straight-flow system in power grid, mains frequency changes, non-faulting straight-flow system
It will detect that deviation occurs for system frequency, and according to the system frequency deviation size detected, quickly put into direct current FLC functions,
Rapid adjustment direct current transmission power amount is the K of specified transmission power1(overload multiple in short-term), i.e. underload transmission power again
PS1, the capability of overload of straight-flow system is played to large extent to reduce the power surplus amount in power grid, and electricity is improved to play
The frequency stability of net.In non-faulting straight-flow system with high load capacity transmission power PS1It, will after continuous service overload in short-term time limit t
The transmission power of straight-flow system adjusts the K of specified transmission power2Again (long-term overload multiple), i.e. underload transmission power PS2,
With the excess power of more steady, safety a rate conveying sending.Finally, effectively alleviate the high frequency problem of system,
To improve system stability.
It is required according to electric network fault characteristic and the control of each DC operation, is rationally arranged more times by " staged " control strategy
After direct current additional frequency limiter, the regulating power of each time direct current FLC can be not only given full play to, it can also be during frequency be soaring
Stage by stage, orderly regulation and control step by step, avoid in the case of power grid accident each direct current FLC regulation and control simultaneously, unordered regulation and control action leads
The overshoot of cause has ensured the controllability of direct current ability of regulation and control.Without carrying out information exchange or differentiation between each direct current, root is only needed
Differentiate according to ac bus frequency, acted by set setting value, there is certain reliability.
By the description of above embodiment of the method, it is apparent to those skilled in the art that the present invention can
Realized by the mode of software plus required general hardware platform, naturally it is also possible to by hardware, but in many cases the former
It is more preferably embodiment.Based on this understanding, technical scheme of the present invention substantially makes tribute to the prior art in other words
The part offered can be expressed in the form of software products, which is stored in a storage medium, packet
Some instructions are included to use so that a computer equipment (can be personal computer, server or the network equipment etc.) executes
The all or part of step of each embodiment method of the present invention.And storage medium above-mentioned includes：Read-only memory (ROM), with
Machine accesses the various media that can store program code such as memory (RAM), magnetic disc or CD.
The above is only the specific implementation mode of the present invention, is made skilled artisans appreciate that or realizing this hair
It is bright.Various modifications to these embodiments will be apparent to one skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest range caused.
The above is only the specific implementation mode of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (4)
1. a kind of multiple-circuit line additional frequency restriction controller control method is suitable for the multiple-circuit line system of Asynchronous Interconnection sending end
System, which is characterized in that including,
The regulation and control initial frequency threshold value Δ f of step S1, predetermined DC FLConFrequency threshold Δ f is terminated with regulation and controloff；
Step S2 monitors the real-time frequency f of sending end power grid, and according to real-time frequency f and steady frequency f0, calculate frequency deviation
F, i.e. Δ f=f-f0；
Step S3, judges whether the frequency deviation f is more than the regulation and control initial frequency threshold value Δ fon；
Step S31：If so, by the transmission power of straight-flow system by specified transmission power P0It is adjusted to preset high load capacity conveying
Power PS1, wherein the high load capacity transmission power PS1For specified transmission power P0The preset multiple of overload in short-term K1Times, i.e.,
PS1=K1P0；
Step S4：Straight-flow system is with high load capacity transmission power PS1After the preset time limit t of overload in short-term of continuous service, by direct current system
The transmission power of system is by the high load capacity transmission power PS1It is adjusted to preset underload transmission power PS2, wherein it is described low negative
Lotus transmission power PS2For specified transmission power P0Preset long-term overload multiple K2Times, i.e. PS2=K2P0；
Step S5：The frequency deviation f of monitoring sending end power grid in real time, and whether determination frequency deviation delta f is less than the regulation and control eventually
Only frequency threshold Δ foff；
Step S51：If so, by the transmission power of straight-flow system by the underload transmission power PS2It is adjusted to described specified defeated
Send power P0。
2. multiple-circuit line additional frequency restriction controller control method according to claim 1, which is characterized in that step S1
Further include determining control parameter before, the control parameter includes overload multiple K in short-term1, it specifically includes,
According to the peak load multiple K of straight-flow systemm, multigroup pre-selection overload multiple K in short-term is set10, wherein K10＜ Km；
Make straight-flow system respectively in each group of pre-selection overload multiple K in short-term10Corresponding high load capacity transmission power PS10Lower operation,
Wherein, PS10=K10P0, and obtain the temporary active power of straight-flow system；
Judge each group of pre-selection overload multiple K in short-term1Whether corresponding temporary active power is equal to pre-selection overload in short-term times
Number K10Corresponding high load capacity transmission power PS10；
If so, by preselected group overload multiple K in short-term10It is set as alternative overload multiple in short-term；
Alternatively select in overload multiple in short-term the maximum alternative overload multiple in short-term of numerical value as overload multiple in short-term
K1。
3. multiple-circuit line additional frequency restriction controller control method according to claim 1, which is characterized in that
Regulation and control terminate frequency threshold Δ foffFor the frequency fluctuation range under sending end power grid normal operating mode.
4. multiple-circuit line additional frequency restriction controller control method according to claim 1 or 3, which is characterized in that
Regulate and control initial frequency threshold value Δ fonMore than the frequency fluctuation range under sending end power grid normal operating mode.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611092279.6A CN106505607B (en) | 2016-11-30 | 2016-11-30 | A kind of multiple-circuit line additional frequency restriction controller control method |
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| CN201611092279.6A CN106505607B (en) | 2016-11-30 | 2016-11-30 | A kind of multiple-circuit line additional frequency restriction controller control method |
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| CN106505607A CN106505607A (en) | 2017-03-15 |
| CN106505607B true CN106505607B (en) | 2018-09-11 |
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