CN103248056A - Reactive voltage emergency control method in concentrated grid connecting area of wind power plant - Google Patents

Reactive voltage emergency control method in concentrated grid connecting area of wind power plant Download PDF

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CN103248056A
CN103248056A CN2013102021347A CN201310202134A CN103248056A CN 103248056 A CN103248056 A CN 103248056A CN 2013102021347 A CN2013102021347 A CN 2013102021347A CN 201310202134 A CN201310202134 A CN 201310202134A CN 103248056 A CN103248056 A CN 103248056A
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idle
situation
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CN103248056B (en
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罗剑波
李琳
陈汹
陈永华
李雪明
许士光
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State Grid Corp of China SGCC
NARI Group Corp
Nari Technology Co Ltd
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Nanjing NARI Group Corp
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Abstract

The invention discloses a reactive voltage emergency control method in a concentrated grid connecting area of a wind power plant, which belongs to the technical field and comprises the steps of electric information collecting, on-site voltage situation judging, sub-area comprehensive voltage situation judging, area coordinating control decision, a reactive support capacity list, an electric related list, area concentrating control and on-site control. The on-site voltage situation judging is used for accelerating the action speed of on-site control, and an area concentrating control center judges the reactive supply-need condition and voltage changing tendency of an area according to a comprehensive voltage situation to select an appropriate control strategy, defines an effective reactive support node range according to the electric related list, and performs dynamic sequencing on the dynamic reactive support capacity of each reactive source in the effective range according to the reactive support capacity list to select appropriate control nodes and reactive-source control sequences. The reactive voltage emergency control method solves the coordinating control problem among multiple reactive sources in the concentrated grid connecting area of the wind power plant, thus enhancing the controllability and timeliness of emergency control on the reactive voltage.

Description

A kind of wind energy turbine set is concentrated the reactive voltage emergency control method in the area of being incorporated into the power networks
Technical field
The invention belongs to the Power System and its Automation technical field, more precisely, the present invention relates to a kind of wind energy turbine set and concentrate the emergency control method that is incorporated into the power networks between regional many reactive sources.
Background technology
Be subjected to the influence of wind energy natural characteristic, wind power generation is different from conventional power supply and presents characteristics such as randomness, intermittence and fluctuation.Also need absorbing reactive power when another distinguishing feature of wind power generation is the wind energy turbine set operation when electrical network is carried active power, the wind-powered electricity generation unit is especially responsive to the point voltage fluctuation of being incorporated into the power networks.What add that the exploitation of China wind-powered electricity generation takes is " extensive exploitation, the remote high-voltage transmission concentrated " pattern, and a large amount of wind-powered electricity generation units are concentrated the terminal electrical network that inserts the electric network composition weakness, these characteristics of having aggravated wind-powered electricity generation.
The common form of being incorporated into the power networks is that many typhoons group of motors is concentrated the access area power grid with the form of wind energy turbine set by booster stations and transmission line in China wind-powered electricity generation base, two to three wind energy turbine set booster stations share one and compile the concentrated more power transmission network of voltage levels that inserts in station, generally be equipped with jumbo static reactive power compensation device in the wind energy turbine set, be used for keeping wind farm grid-connected point (refer generally to boost and become high-pressure side) voltage in rational excursion.Since the wind-powered electricity generation unit to and the voltage ratio of site responsive, when power transmission network or peripheral wind energy turbine set generation catastrophe failure, easily cause the chain off-grid of large-scale wind power unit.The chain off-grid accident analysis of a lot of extensive blower fan that takes place at wind-powered electricity generation base, Jiuquan in 2011 and Zhangbei County scene storage base as can be known, wind-powered electricity generation compiles the area and lacks the effectively idle ability of regulation and control of associating, wind energy turbine set serves as that the control target is carried out independent regulation with the point voltage that is incorporated into the power networks separately all, especially for sharing the station situation of compiling, it all is target with the high side voltage, each self-adjusting 35kV side reactive power compensator, the voltage of a plurality of nodes is regulated repeatedly and is lacked effective cooperation means, even may cause situation such as idle circulation.
Wind energy turbine set concentrates the area of being incorporated into the power networks to lack effective control method for coordinating, and the Voltage Emergency Control in the conventional area of electrical network has seen that the main stream approach of bibliographical information has secondary voltage emergency control under the AVC system, distributed Voltage Emergency Control, the stable back of voltage emergency control that multi-control method is coordinated, coordinates control etc. based on the voltage of multi-agent technology.The optimal control method that still is based on trend calculating that wherein AVC method and distributed Voltage Emergency Control stress, amount of calculation is big, and control cycle is long; The stable back of voltage emergency control still is based on multi-agent technology in essence, voltage based on multi-agent technology is coordinated control, be to study from real-time control angle according to the voltage feedback information, this method need be gathered a large amount of information, and real-time communication is had relatively high expectations.These methods are not considered the characteristic of wind-powered electricity generation, all can not be directly used in wind energy turbine set and concentrate the area of being incorporated into the power networks.
Above reactive power method needs to concentrate the area feature that is incorporated into the power networks to carry out adaptability reform at wind energy turbine set, has following patent to carry out relevant report.
Chinese patent literature CN101719676A, Shen Qing Publication day 2010-06-02, put down in writing a kind of voltage control technology of wind energy turbine set, this technology is coordinated control at the voltage of the windy electric field with transmission line, comprise voltage monitoring system and windy reactive voltage control method for coordinating, shift reactive load by loss optimizing algorithm being applied to comprehensive a plurality of wind energy turbine set and transmission line, reaching between local wind electric field and transmission line, make loss minimize.What but above-mentioned technology was primarily aimed at is idle work optimization control under the normality, utilize wind energy turbine set on the spot information go to coordinate the wind energy turbine set of peripheral close relation by the off-line control law of adjusting, only adapt among a small circle in coordination control between the clear and definite wind energy turbine set of several electrical links.
Chinese patent literature CN102769301A, Shen Qing Publication day 2012-11-07, put down in writing the voltage control method of a kind of wind electric field blower terminal voltage when in the hole, this method is in a safe condition according to blower fan and wind farm grid-connected point voltage or precarious position is hived off takes different control measure, adjust the blower fan of safe condition in the wind energy turbine set and static reactive power compensation device to the idle desired value of appointment to support the blower fan of precarious position, idle desired value is to carry out COMPREHENSIVE CALCULATING by the variation value of reactive source and idle allowance situation to draw.Be to coordinate control between the blower fan of inside, single wind-powered electricity generation station and the static reactive power compensation device but above-mentioned technology is primarily aimed at, with in electric association closely under the situation, basic identical with the field voltage variation tendency, be difficult to blower fan and static reactive power compensation device are hived off according to state, also just can not carry out idle complementary control.
Pertinent literature and patent, generally at be that reactive voltage between conventional electrical network or a small amount of wind energy turbine set is coordinated control, what pay attention to more is optimal control under the normality, for in emergency circumstances, control method for coordinating between the wind energy turbine set in the concentrated area of being incorporated into the power networks of wind-powered electricity generation between mutual support method and many reactive sources, lack systematic research, the present invention has filled up the research vacancy in this field.
Summary of the invention
The objective of the invention is: propose a kind of wind energy turbine set and concentrate the reactive voltage emergency control method that inserts the area, to overcome the deficiencies in the prior art part, make the static reactive power compensation device in many wind energy turbine set that are distributed in certain zone can carry out quicker more effective coordination, in case of emergency finish the purpose that voltage is coordinated control task jointly to reach.
Specifically, the present invention adopts following technical scheme to realize, comprises the following steps:
1) each wind energy turbine set carries out controlling automatically with regard to ground voltage, gather electric information, carry out judging to determine whether to take on the spot regulation and control strategy fast with regard to ground voltage situation, and be to be uploaded to the centralized control center after unit gathers with the wind energy turbine set with electric information with regard to ground voltage situation judged result;
2) centralized control center gather peripheral power transmission network electric information and each wind energy turbine set with regard to ground voltage situation judged result, wind energy turbine set busbar voltage degrees of offset sorted determine the voltage modulated point, the dynamic reactive enabling capabilities that regularly calculates and upgrade local reactive source is estimated index and is carried out idle enabling capabilities ordering, obtains reactive source enabling capabilities table;
3) centralized control center carries out subarea integrated voltage situation judgement, when subarea integrated voltage situation result of determination is urgent situation, then take wind energy turbine set side control measure on the spot, and taking the wind energy turbine set side on the spot after the control measure, whether need to determine the neighboring area to participate in coordinating control according to the idle supply and demand situation in one's respective area; When the result of determination of urgent situation also satisfies the condition of accelerating the subsequent rounds action, then accelerate the subsequent rounds action; When subarea integrated voltage situation result of determination is warning situation, then directly whether need to determine the neighboring area to participate in coordinating control according to the idle supply and demand situation in one's respective area; When subarea integrated voltage situation result of determination is normal situation, undertaken controlling to keep this point voltage that is incorporated into the power networks stable automatically with regard to ground voltage by each wind energy turbine set;
Show when the idle supply in one's respective area during more than or equal to maximum reactive requirement as the idle supply and demand situation in one's respective area, then controlled separately by the one's respective area, effectively control range of nodes is selected according to electric contingency table by the centralized control center, determine the regulation and control order of the reactive source in effective range of nodes according to reactive source enabling capabilities table, take turns the reactive source number of adjustment and the idle desired value of corresponding each reactive source according to the evaluation method decision of idle controlled quentity controlled variable is every, and control command is handed down to each relevant wind energy turbine set;
When showing the idle supply in one's respective area less than maximum reactive requirement as the idle supply and demand situation in one's respective area, then select the close and idle standby bigger zone of peripheral electric association as association control zone, controlled by the idle coordination that centralized control center, master control zone concentrates, calculate the overall idle desired value in association control zone, the overall idle desired value that association will receive the regional centralized control center of control is again decomposed, select suitable reactive source to participate in idle support, and control command is handed down to each relevant wind energy turbine set;
4) successfully receive the control command that the centralized control center issues as each relevant wind energy turbine set, then the idle control desired value that issues according to the centralized control center of each relevant wind energy turbine set is carried out from main regulation to reach the idle value that the centralized control center requires;
Failing if any wind energy turbine set receives the control command that the centralized control center issues, and then then still to carry out autonomous voltage control according to set control strategy on the spot stable to keep this point voltage that is incorporated into the power networks for this wind energy turbine set.
Beneficial effect of the present invention is as follows: defined subarea integrated voltage situation in the inventive method and judged, can select different control strategies fast by this judgement; The invention allows for electric contingency table, idle enabling capabilities table, can determine range of nodes and reactive source regulation and control order fast by this two table, estimate calculating by idle controlled quentity controlled variable and can calculate the every reactive source number that move of taking turns, regulate and control successively according to the ordering in the idle enabling capabilities table, the voltage of dangerous node can be recalled to safe range as early as possible.Than traditional considering by desirable reactive source characteristic, the wind energy turbine set of minority electric voltage exception is recalled to as early as possible the control method of normal range (NR), this method has considered that the static reactive power compensation device has different responding abilities under different terminal voltages, its adaptability is stronger, more can provide idle support fast for wind farm grid-connected point under the emergency.
Description of drawings
Fig. 1 concentrates the reactive voltage emergency control method in the area of being incorporated into the power networks for wind energy turbine set and implements schematic diagram.
Fig. 2 concentrates the overall control scheme schematic diagram of the regional reactive voltage emergency control that is incorporated into the power networks for wind energy turbine set.
Fig. 3 concentrates the flow chart of the regional reactive voltage emergency control method that is incorporated into the power networks for wind energy turbine set.
Embodiment
With reference to the accompanying drawings and in conjunction with example the present invention is described in further detail.
The present invention comprises following committed step:
(1) electric information collection: by communicating to obtain running state information and the idle allowance situation of corresponding reactive source with blower fan centralized control system, static reactive power compensation apparatus control system, to also site and peripheral power transmission network electric information gather to judge local voltage condition, each wind energy turbine set is that unit concentrates the control website that is uploaded to the higher level with after above-mentioned information gathering gathers in the field with the wind energy turbine set.
(2) voltage situation is judged: voltage situation is carried out synthetic determination according to a plurality of voltage indexes to current voltage security degree and variation tendency, wherein with regard to ground voltage situation according to busbar voltage mean deviation value, the busbar voltage average rate of change, the transient voltage margin of safety, four indexs of idle supply and demand sudden change index are judged, be used for determining whether preferentially to take control measure on the spot, the zone centralized control center according to each wind energy turbine set with regard to ground voltage situation result of determination, the idle spare condition in transmission relation circuit electric information and subarea is comprehensively judged voltage condition and the variation tendency of one's respective area, subarea integrated voltage situation result of determination is used for determining to take to coordinate control or interval coordination control strategy in the subarea, whether accelerates the subsequent rounds responsiveness.
Particularly, voltage mean deviation index calculating method is:
Δ U ‾ ( k + 1 ) = | U ( k + 1 ) - U ( k ) + Δ U ‾ ( k ) | / 2 - - - ( 1 )
If
Figure BDA00003248266800052
U in the formula Cr, 1, U Cr, 2Refer to guard against the critical off-grid magnitude of voltage of magnitude of voltage and blower fan respectively, rule of thumb can get respectively 0.1 and 0.4p.u(if variation for just, then get respectively 0.05 and 0.1p.u),
Figure BDA00003248266800061
Be the voltage fluctuation tolerance interval, general desirable 0.05p.u.
Voltage average rate of change computational methods are:
U · ave ( k ) = Δ U ‾ ( k + 1 ) / ΔT (Δ T is the counting period) (2)
If
Figure BDA00003248266800063
Be the faulty action preventing degating region that arranges, voltage change ratio scene jumpy when being used for blocking voltage disturbance scene or near terminal fault.DU 1/ dt and dU 2/ dt is respectively the threshold value of the slow rate of change of voltage and the rapid rate of change of voltage, can obtain by a large amount of simulation analysis in conjunction with engineering experience.
Voltage security nargin index calculating method is: be lower than voltage protection threshold value U from the monitoring point voltage minimum Cr, iThe beginning calculating voltage is lower than U Cr, iDuration Δ T i, then voltage security nargin index is:
η＝(T cr,i-ΔT i)/T cr,i （3）
If
Figure BDA00003248266800065
T in the formula Cr, iEach stage protection action delay that corresponding blower fan under-voltage protection is set; η B1, η B2(0≤η B2＜η B1＜1) is voltage security nargin threshold value, can draws empirical value by a large amount of simulation analysis.
Idle supply and demand sudden change index calculating method is: it is Δ Q that a supposition interior reactive source (SVC or opening-closing capacitor bank etc.) is concentrated reactive-load compensation equipment reactive power change amount G, the total reactive requirement variation of this blower fan shows as Δ Q L, capacity of short circuit is S under this and the site normal condition SC, then idle variation is converted the index of change in voltage and is:
ΔV eff＝|（ΔQ G-ΔQ L）/S SC| （4）
If
Figure BDA00003248266800066
Δ V in the formula CrThe setting threshold value of expression voltage fluctuation is set according to operating experience.
Idle standby index calculating method is: according to idle real-time balance and available idle allowance, judge idle standby safe coefficient.When idle standby when not enough, give warning in advance or accelerate follow-up adjusting.Its computing formula is:
k Q＝（ΣQ G-ΣQ L）/ΣQ G （5）
Σ Q in the formula LBe the total reactive requirement of this subarea blower fan, Σ Q GBe the total idle available quantity of this subarea reactive source;
If
Integrated voltage situation criterion: make R=R 1∪ R 2∪ R 3∪ R 4∪ R 5, K=K 1∪ K 2∪ K 3∪ K 5, judge according to the logical consequence of R and K:
If
Figure BDA00003248266800072
Formula (1)～(4) can be used for carrying out judging to draw with regard to ground voltage situation that each is wind farm grid-connected with regard to ground voltage situation result in the zone.On this basis, add the idle standby index in subarea of formula (5), can synthetic determination should the zone integrated voltage situation, thereby judge the main region of fault effects, be set at emergency region, as the main object of regulation and control, periphery had direct electrical link and the comparatively safe zone of voltage situation can be elected to be association control zone, thereby determined principal and subordinate's priority of control, helped outstanding voltage-controlled emphasis.Can also take some control measure on the spot, the extension of preventing accident or influencing fast at emergency region according to voltage situation result of determination.
(3) regional coordination control decision: the regional coordination control decision is selected corresponding control strategy according to integrated voltage situation result of determination, select effective idle support range of nodes according to electric contingency table again, utilize the idle enabling capabilities voting of dynamic refresh to decide the regulation and control order that the interior reactive source of effective range is controlled node, predictor method according to idle controlled quentity controlled variable calculates the every reactive source number that move of taking turns, and moves according to idle enabling capabilities table.Wherein:
(3-1) electric contingency table: calculate by trend in the external world or set according to artificial operating experience between the control node after the reactive voltage sensitivity, calculated off-line goes out different reactive source nodes to the correlation degree of control node in advance, with the range of nodes of determining that the control node voltage preferentially carries out idle regulation and control when out-of-limit.This method has guaranteed that the reactive source node provides idle support satisfying under the security constraint prerequisite of self, only needs according to the electric contingency table of control node status inquiry to obtain effective range of nodes and corresponding reactive power information during use.Its calculation expression is:
EC m , n = S m , n · Δi n max
Δi n max = min { | i n b - i n | , | V n b - V n | / S n , n }
S in the formula M, nThe voltage V of expression control node m kTo reactive source node n reactive current i nSensitivity;
Figure BDA00003248266800083
Expression reactive source node n available maximum reactive current enabling capabilities in safe range;
Figure BDA00003248266800084
(it is decided by S to the reactive current limiting value of expression reactive source node n M, nWith the terminal voltage degrees of offset);
Figure BDA00003248266800085
The voltage limit value of the reactive source node n of correspondence during expression reactive current limiting value.
(3-2) idle enabling capabilities table: the centralized control center carries out regular update according to the running state information of each reactive source that collects, with certain control cycle the dynamic reactive enabling capabilities of each reactive source being estimated index rolls and upgrade to calculate, sort by from big to small order and to try to achieve, its calculation expression is:
W Q Gj = [ U t ( k ) + Δ Q Gj · S V i Qj - γ · t resp ] · I n max ( k ) · t dur
In the formula
Figure BDA00003248266800087
For the idle enabling capabilities of reactive source j is estimated index, U t(k) be the k terminal voltage effective value of reactive source constantly, Δ Q GjBe the idle allowance of reactive source, S VQExert oneself to the voltage sensibility of control node for reactive source is idle; I Nmax(k) be that reactive source injects the maximum dynamic reactive electric current of electric power system under the current terminal voltage level; t DurFor the reactive source dynamic reactive supports the duration; t RespBe reactive source response time (switching to designated state institute time-consuming from current state); γ is the commutation factor that the response time is converted to variation, and namely the start-up time of reactive source can be by its conversion to change in voltage between the starting period, and can be with the k busbar voltage average rate of change of reactive source node constantly
Figure BDA00003248266800091
Come approximate the replacement.
(3-3) estimation of idle controlled quentity controlled variable: the centralized control center makes it return to normal range (NR) as early as possible with the voltage of regulating and control dangerous node and serves as the control target, carry out the estimation of idle controlled quentity controlled variable according to following expression according to subarea integrated voltage situation and idle enabling capabilities table:
V cr ( k ) + Σ j = 1 N S Vcr , QGj · Δ Q Gj ( k ) ≥ V cr , i + ϵ
In the formula: V Cr(k) be offset maximum node (dangerous node) at k busbar voltage effective value constantly for busbar voltage; S Vcr, QGjIdle voltage control sensitivity to dangerous node for reactive source j; Δ Q Gj(k) be reactive source j in the constantly maximum available idle amount of k, determined by idle enabling capabilities table; V Cr, iProtect the off-grid voltage threshold of the different phase of definite value setting for blower voltage; The regulating and controlling voltage allowance of ε for setting; N is adjustable reactive source number.
(4) centralized control and control on the spot: preferentially carry out wind energy turbine set fast reactive regulating and controlling voltage on the spot, when this impotentia is recalled to voltage in the safe range, carry out unified coordination control by the centralized control center, control thinking according to " voltage layering and zoning control; take different control strategies on the spot stage by stage ", utilize electric contingency table and idle enabling capabilities table, calculated the idle desired value of respectively controlling website by idle controlled quentity controlled variable predictor method, the idle desired value of website of respectively controlling that the centralized control center will calculate again issues, each wind energy turbine set control station is on the spot carried out from main regulation according to the idle desired value that the centralized control center issues, and adjusts to required value as early as possible.
The wind energy turbine set of introducing among Fig. 1 is concentrated the reactive voltage emergency control method embodiment in the area of being incorporated into the power networks, by electric information acquisition module, communication network, with regard to ground voltage situation judge module, subarea integrated voltage situation judge module, regional coordination control decision module, idle enabling capabilities computing module, electric contingency table administration module and on the spot major part such as controller form.Wherein the electric information acquisition module obtains this wind-powered electricity generation unit operation information by communicating by letter with the blower fan centralized control center, by with the static reactive power compensation device (as SVC, STATCOM etc.) running state information in dynamic reactive source is obtained in control system communication, by the crucial electric information amount of gathering wind farm grid-connected point and sending power transmission line judge wind energy turbine set with regard to ground voltage situation to determine whether take fast control strategy on the spot, the measurement group is with the wind electric field blower operation information, the reactive source running state information, gather the back with regard to tripartite surface informations such as ground voltage situation result of determination and control website by giving the higher level on the communication network.
The centralized control center, zone partly is made up of subarea integrated voltage situation module, reactive source enabling capabilities computing module, electric contingency table administration module and regional coordination control decision module etc.Subarea integrated voltage situation module is according to the information of sending on each wind energy turbine set in the zone, and the electric information of comprehensive peripheral power transmission network is judged the integrated voltage situation in this subarea fast, coordinates still interval Collaborative Control strategy of control in determining to take to distinguish.Reactive source enabling capabilities computing module rolls to upgrade by certain control cycle according to the reactive source running state information that dynamically updates and calculates, and result of calculation sorted by from big to small order, ranking results is offered regional coordination control decision module.Electric contingency table administration module is responsible for renewal and the management of electric contingency table, inquiry service is provided, after regional coordination control decision module provided dangerous nodal information, this module need provide effective control range of nodes of coupling and the reactive voltage sensitivity of each node correspondence.Regional coordination control decision module is in conjunction with subarea integrated voltage situation result of determination, select the most serious node of variation as dangerous node, inquire about electric contingency table and obtain effective control range of nodes, inquiry reactive source enabling capabilities table obtains the real-time enabling capabilities of the reactive source of corresponding control node, dynamic order is carried out in the regulation and control of the reactive source in the effective range in proper order obtain corresponding reactive source enabling capabilities sublist, determine every reactive source that move of taking turns according to idle controlled quentity controlled variable predictor method, control in proper order by reactive source regulation and control in the reactive source enabling capabilities sublist, issue each corresponding reactive source and control idle desired value, controller carries out from main regulation according to the idle desired value that the centralized control center issues on the spot, reaches the control required value as early as possible.
Fig. 2 concentrates the overall control scheme schematic diagram of the regional reactive voltage emergency control method that is incorporated into the power networks for wind energy turbine set, be according to the control thinking of " voltage layering and zoning control; take Different Strategies on the spot stage by stage ", can be divided into control strategy and centralized control center's strategy on the spot, specifically:
(1) control strategy (strategy) stage by stage on the spot
Phase I, low-voltage is passed through the stage: the wind-powered electricity generation unit utilizes the idle ability of regulation and control (low-voltage pass through the operation of control, net side converter SVG state, promptly fall meritorious additional issue idle etc.) of self, keep as far as possible and be incorporated into the power networks, provide suitable reactive current to support in conjunction with s own situation; STATCOM, SVC press the set control strategy autonomous operation of equipment (general direct maximum is idle), and locking (be lower than 0.60p.u and surpass the fixed time) is carried out in SVC protection action when voltage seriously falls;
Second stage, voltage are recovered the stage: when rate of voltage rise is too fast, and cut-out capacitor group fast; If voltage recovery rate slows down or when returning in the fence coverage, then need locking strategy on the spot, coordinate control to centralized control center application voltage, assign control command after concentrating coordination optimization by the centralized control center according to local information, controller is taked corresponding control measure according to control command on the spot.The SVC releasing process is with zero idle heavy throwing, concentrates the control strategy action of optimizing decision-making according to the centralized control center, switches to corresponding control model fast.
(2) centralized control center's strategy (control is coordinated in the subarea)
Centralized control center's strategy needs to take different control strategies according to subarea integrated voltage situation result of determination:
When integrated voltage situation result of determination is urgent situation, take wind energy turbine set side control measure on the spot fast, adjacent control website directly provides maximum idle support, with the order of severity and the coverage that weakens variation, taking accordingly to carry out voltage situation judgement on the spot after the control measure on the spot, judge the voltage recovery situation, if when the fast quick-recovery of voltage may cause serious voltage-overshoot problem, take in advance latch portion SVC even excise the strategy of capacitor group fast; In the time of as if voltage recovery rate in the reasonable scope, adopt the coordination control strategy of centralized control center.
When integrated voltage situation result of determination is warning situation or urgent situation but when having taked certain measure on the spot, adopt the subarea coordination control strategy of centralized control center, the subarea is carried out the reactive requirement amount and is estimated calculating, when reactive requirement during greater than the maximum idle supply capacity in one's respective area, seek adjacent association control zone according to the electric degree of association and idle spare condition, apply for idle support to it, reactive source regulation and control sequential list is determined according to reactive source enabling capabilities sequencing table in association control zone; Idle when standby less than the one's respective area when the reactive requirement increment, the subarea is coordinated the control decision module and is determined reactive source regulation and control sequential list according to reactive source enabling capabilities sequencing table, carries out follow-up adjustment according to the voltage feedback.
Fig. 3 is that wind energy turbine set concentrates the flow chart of the regional reactive voltage emergency control method that is incorporated into the power networks, and according to the control sequence of coordinating-controlling on the spot from monitoring-centralized control center on the spot, is made up of following key step:
The first step is that wind energy turbine set is controlled automatically with regard to ground voltage, be responsible for to gather electric information and carry out judging to take on the spot regulation and control strategy fast with regard to ground voltage situation, and be to be uploaded to higher level's control station after unit gathers with the wind energy turbine set with electric information with regard to ground voltage situation result.
Second step was that higher level's control station (centralized control center) gathers peripheral power transmission network electric information and each wind energy turbine set with regard to ground voltage situation result of determination, wind energy turbine set busbar voltage degrees of offset sorted determine dangerous node (voltage modulated point), regularly calculate and the dynamic reactive enabling capabilities that upgrades local reactive source is estimated index and carried out idle enabling capabilities ordering.
The 3rd step was that the centralized control center carries out subarea integrated voltage situation judgement, select different control strategy (seeing the explanation that Fig. 2 totally controls the scheme part for details) according to result of determination, whether need to determine the neighboring area to participate in coordinating control according to the idle supply and demand situation in one's respective area, when the idle supply in one's respective area during greater than maximum reactive requirement, controlled separately by the one's respective area, effectively control range of nodes is selected according to electric contingency table by the centralized control center, determine the regulation and control order of the reactive source in effective range of nodes to determine the every reactive source number of adjustment and idle desired value of corresponding each reactive source of taking turns according to idle controlled quentity controlled variable evaluation method according to idle enabling capabilities sequencing table; When the idle supply in one's respective area during less than maximum reactive requirement, need to select the close and idle standby bigger zone of peripheral electric association as association control zone, controlled by the idle coordination that centralized control center, master control zone concentrates, calculate the overall idle desired value in association control zone, the overall idle desired value that association will receive the regional centralized control center of control is again decomposed, select suitable reactive source to participate in idle support, issue the idle desired value of selected reactive source correspondence.
The 4th step was that the idle control desired value assigned according to the centralized control center of controller is carried out from main regulation on the spot, reach the idle value of higher level request as early as possible, when causing on the spot controller unusually, communication network successfully do not receive the higher level when instructing, then still carry out autonomous voltage control according to set control strategy on the spot, keep this and be incorporated into the power networks point voltage in the reasonable scope.
Though the present invention is with preferred embodiment openly as above, embodiment be not limit of the present invention.Without departing from the spirit and scope of the invention, any equivalence of doing changes or retouching, belongs to the present invention's protection range equally.Therefore protection scope of the present invention should be standard with the application's the content that claim was defined.

Claims (5)

1. a wind energy turbine set is concentrated the reactive voltage emergency control method in the area of being incorporated into the power networks, and it is characterized in that, comprises the steps:
1) each wind energy turbine set carries out controlling automatically with regard to ground voltage, gather electric information, carry out judging to determine whether to take on the spot regulation and control strategy fast with regard to ground voltage situation, and be to be uploaded to the centralized control center after unit gathers with the wind energy turbine set with electric information with regard to ground voltage situation judged result;
2) centralized control center gather peripheral power transmission network electric information and each wind energy turbine set with regard to ground voltage situation judged result, wind energy turbine set busbar voltage degrees of offset sorted determine the voltage modulated point, the dynamic reactive enabling capabilities that regularly calculates and upgrade local reactive source is estimated index and is carried out idle enabling capabilities ordering, obtains reactive source enabling capabilities table;
3) centralized control center carries out subarea integrated voltage situation judgement, when subarea integrated voltage situation result of determination is urgent situation, then take wind energy turbine set side control measure on the spot, and taking the wind energy turbine set side on the spot after the control measure, whether need to determine the neighboring area to participate in coordinating control according to the idle supply and demand situation in one's respective area; When the result of determination of urgent situation also satisfies the condition of accelerating the subsequent rounds action, then accelerate the subsequent rounds action; When subarea integrated voltage situation result of determination is warning situation, then directly whether need to determine the neighboring area to participate in coordinating control according to the idle supply and demand situation in one's respective area; When subarea integrated voltage situation result of determination is normal situation, undertaken controlling to keep this point voltage that is incorporated into the power networks stable automatically with regard to ground voltage by each wind energy turbine set;
Show when the idle supply in one's respective area during more than or equal to maximum reactive requirement as the idle supply and demand situation in one's respective area, then controlled separately by the one's respective area, effectively control range of nodes is selected according to electric contingency table by the centralized control center, determine the regulation and control order of the reactive source in effective range of nodes according to reactive source enabling capabilities table, take turns the reactive source number of adjustment and the idle desired value of corresponding each reactive source according to the evaluation method decision of idle controlled quentity controlled variable is every, and control command is handed down to each relevant wind energy turbine set;
When showing the idle supply in one's respective area less than maximum reactive requirement as the idle supply and demand situation in one's respective area, then select the close and idle standby bigger zone of peripheral electric association as association control zone, controlled by the idle coordination that centralized control center, master control zone concentrates, calculate the overall idle desired value in association control zone, the overall idle desired value that association will receive the regional centralized control center of control is again decomposed, select suitable reactive source to participate in idle support, and control command is handed down to each relevant wind energy turbine set;
4) successfully receive the control command that the centralized control center issues as each relevant wind energy turbine set, then the idle control desired value that issues according to the centralized control center of each relevant wind energy turbine set is carried out from main regulation to reach the idle value that the centralized control center requires;
Failing if any wind energy turbine set receives the control command that the centralized control center issues, and then then still to carry out autonomous voltage control according to set control strategy on the spot stable to keep this point voltage that is incorporated into the power networks for this wind energy turbine set.
2. wind energy turbine set according to claim 1 is concentrated the reactive voltage emergency control method in the area of being incorporated into the power networks, it is characterized in that, described subarea integrated voltage situation is judged, be to come the current voltage security degree of synthetic determination and variation tendency according to busbar voltage mean deviation value, the busbar voltage average rate of change, transient voltage margin of safety, idle spare condition and idle supply and demand sudden change index, and by multinomial reactive voltage index of correlation synthetic determination result decision, each index is respectively as shown in the formula shown in (1)～(5), and corresponding computational methods are respectively:
Voltage mean deviation index
Figure FDA00003248266700021
Computational methods be:
Δ U ‾ ( k + 1 ) = | U ( k + 1 ) - U ( k ) + Δ U ‾ ( k ) | / 2 - - - ( 1 )
If
Figure FDA00003248266700023
U in the formula Cr, 1, U Cr, 2Be respectively warning magnitude of voltage and the critical off-grid magnitude of voltage of blower fan,
Figure FDA00003248266700024
Be the voltage fluctuation tolerance interval,
Figure FDA00003248266700025
Be the busbar voltage mean deviation value that k calculates constantly, U (k), U (k+1) are respectively k and k+1 moment busbar voltage effective value; R 1Be the first warning situation logical consequence value, K 1It is the first urgent situation logical consequence value;
The voltage average rate of change
Figure FDA00003248266700026
Computational methods be:
U · ave ( k ) = Δ U ‾ ( k + 1 ) / ΔT - - - ( 2 )
If
Figure FDA00003248266700028
Δ T is the counting period in the formula,
Figure FDA00003248266700031
Be the faulty action preventing degating region that arranges, voltage change ratio scene jumpy when being used for blocking voltage disturbance scene or near terminal fault; DU 1/ dt and dU 2/ dt is respectively the threshold value of the slow rate of change of voltage and the rapid rate of change of voltage; R 2Be the second warning situation logical consequence value, K 2It is the second urgent situation logical consequence value;
The computational methods of voltage security nargin index η are:
η＝(T cr,i-ΔT i)/T cr,i （3）
If
Figure FDA00003248266700032
Δ T in the formula iFor be lower than voltage protection threshold value U from the monitoring point voltage minimum Cr, iThe voltage of beginning is lower than U Cr, iDuration, T Cr, iFor each stage that the blower fan under-voltage protection is set is protected action delay; η B1, η B2Be voltage security nargin threshold value, 0≤η B2＜η B1＜1; R 3Be the 3rd warning situation logical consequence value, K 3It is the 3rd urgent situation logical consequence value;
Idle supply and demand sudden change index Δ V EffComputational methods be:
ΔV eff＝|（ΔQ G-ΔQ L）/S SC| （4）
If
Δ Q in the formula GBe the reactive power change amount of the concentrated reactive-load compensation equipment of reactive source in the field, Δ Q LFor the total reactive requirement of this blower fan changes S SCBe capacity of short circuit under this and the site normal condition, Δ V CrSetting threshold value for the voltage fluctuation; R 4It is the 4th warning situation logical consequence value;
Idle standby index k QComputational methods be:
k Q＝（ΣQ G-ΣQ L）/ΣQ G （5）
If
Figure FDA00003248266700034
Σ Q in the formula LBe the total reactive requirement of this subarea blower fan, Σ Q GBe the total idle available quantity of this subarea reactive source; R 5Be the 5th warning situation logical consequence value, K 5It is the 5th urgent situation logical consequence value;
Integrated voltage situation determination methods is:
Make that R is total warning situation logical consequence value, K is total urgent situation logical consequence value, and R=R is then arranged 1∪ R 2∪ R 3∪ R 4∪ R 5, K=K 1∪ K 2UK 3∪ K 5, judge according to the logical consequence of R and K:
If
3. wind energy turbine set according to claim 1 is concentrated the reactive voltage emergency control method in the area of being incorporated into the power networks, it is characterized in that, described reactive source enabling capabilities table, be estimating index by quasi real time roll calculating the dynamic reactive enabling capabilities, sorting by from big to small order and trying to achieve, its calculation expression is:
W Q Gj = [ U t ( k ) + Δ Q Gj · S V i Qj - γ · t resp ] · I n max ( k ) · t dur
Figure FDA00003248266700043
= [ U t ( k ) + Δ Q Gj · S V i Qj - U · j , ave ( k ) · t resp ] · I n max ( k ) · t dur
In the formula Be the idle enabling capabilities of reactive source, U t(k) be the k terminal voltage effective value of reactive source constantly, Δ Q GjBe the idle allowance of reactive source, S ViQjExert oneself to the voltage sensibility of control node for reactive source is idle, γ is the commutation factor that the response time is converted to variation, I Nmax(k) be that reactive source injects the maximum dynamic reactive electric current of electric power system, t under the current terminal voltage level DurBe the duration that the reactive source dynamic reactive supports, t RespBe the reactive source response time,
Figure FDA00003248266700046
The busbar voltage average rate of change for k moment reactive source node j.
4. wind energy turbine set according to claim 1 is concentrated the reactive voltage emergency control method in the area of being incorporated into the power networks, it is characterized in that, described electric contingency table, be after reactive voltage sensitivity between the known control node, calculated off-line goes out the reactive source node to the correlation degree of difference control node in advance, in order to determine and node electrical link idle regulation and control range of nodes closely that its calculation expression is:
EC m , n = S m , n · Δi n max - - - ( 7 )
Δi n max = min { | i n b - i n | , | V n b - V n | / S n , n } - - - ( 8 )
EC in the formula M, nExpression reactive source node n is to the correlation degree of control node m, S M, nThe voltage V of expression control node m mTo reactive source node n reactive current i nSensitivity, S N, nExpression reactive source node voltage V nTo self reactive current i nSensitivity,
Figure FDA00003248266700052
Expression reactive source node n available maximum reactive current enabling capabilities in safe range,
Figure FDA00003248266700053
Expression reactive source node n reactive current limiting value,
Figure FDA00003248266700054
The voltage limit value of corresponding reactive source node n during expression reactive current limiting value, i nExpression reactive source node n reactive current instantaneous value, V nThe voltage effective value of expression reactive source node n.
5. wind energy turbine set according to claim 1 is concentrated the reactive voltage emergency control method in the area of being incorporated into the power networks, it is characterized in that, the evaluation method of described idle controlled quentity controlled variable is: earlier determine that according to electric contingency table contact regulates and control the reactive source range of nodes closely, determine actual adjustable reactive source number by reactive source enabling capabilities table again, comprehensive above two table results obtain every reactive source number and the pondage that should regulate of taking turns by the target inequality that satisfies formula (9);
V cr ( k ) + Σ j = 1 N S Vcr , QGj · Δ Q Gj ( k ) ≥ V cr , i + ϵ - - - ( 9 )
V in the formula Cr(k) be offset maximum node at k busbar voltage effective value constantly, S for busbar voltage Vcr, QGjBe the idle voltage control sensitivity to dangerous node of reactive source j, Δ Q Gj(k) be reactive source j at k maximum available idle amount constantly, V Cr, iThe off-grid voltage threshold of the different phase of setting for blower voltage protection definite value, the regulating and controlling voltage allowance of ε for setting; N is adjustable reactive source number.
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