CN103248056B - 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 PDFInfo
- Publication number
- CN103248056B CN103248056B CN201310202134.7A CN201310202134A CN103248056B CN 103248056 B CN103248056 B CN 103248056B CN 201310202134 A CN201310202134 A CN 201310202134A CN 103248056 B CN103248056 B CN 103248056B
- Authority
- CN
- China
- Prior art keywords
- voltage
- reactive
- control
- situation
- idle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000011217 control strategy Methods 0.000 claims abstract description 18
- 230000009471 action Effects 0.000 claims abstract description 12
- 239000012141 concentrate Substances 0.000 claims description 24
- 230000001276 controlling effect Effects 0.000 claims description 24
- 230000008859 change Effects 0.000 claims description 22
- 230000033228 biological regulation Effects 0.000 claims description 21
- 230000005540 biological transmission Effects 0.000 claims description 14
- 238000004364 calculation method Methods 0.000 claims description 11
- 238000000205 computational method Methods 0.000 claims description 8
- 208000024891 symptom Diseases 0.000 claims description 8
- 230000001105 regulatory effect Effects 0.000 claims description 7
- 230000035945 sensitivity Effects 0.000 claims description 5
- 238000011156 evaluation Methods 0.000 claims description 4
- 230000004044 response Effects 0.000 claims description 4
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 claims description 3
- 230000000903 blocking effect Effects 0.000 claims description 2
- 238000012986 modification Methods 0.000 claims description 2
- 230000004048 modification Effects 0.000 claims description 2
- 230000001052 transient effect Effects 0.000 claims description 2
- 238000012163 sequencing technique Methods 0.000 abstract description 4
- 230000002708 enhancing effect Effects 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 8
- 230000003068 static effect Effects 0.000 description 8
- 238000004891 communication Methods 0.000 description 5
- 230000005611 electricity Effects 0.000 description 5
- 230000005684 electric field Effects 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000010248 power generation Methods 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 238000013316 zoning Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004422 calculation algorithm Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000004043 responsiveness Effects 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
Classifications
-
- 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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
Landscapes
- Supply And Distribution Of Alternating Current (AREA)
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
Technical field
The invention belongs to Power System and its Automation technical field, more precisely, the present invention relates to a kind of wind energy turbine set and concentrate emergency control method between the many reactive sources in grid-connected area.
Background technology
By the impact of wind energy natural characteristic, wind power generation is different from normal power supplies and presents the features such as randomness, intermittence and fluctuation.Also need absorbing reactive power to the while of electrical network conveying active power when another distinguishing feature of wind power generation is wind energy turbine set operation, Wind turbines is especially responsive to grid-connected point voltage fluctuation.What add that China's Wind Power Generation takes is " extensive concentrate exploitation, remote high-voltage transmission " pattern, and a large amount of Wind turbines concentrates the end electrical network of access electric network composition weakness, exacerbates these features of wind-powered electricity generation.
Grid-connected form common in China's wind power base is that multiple stage Wind turbines concentrates access area power grid with the form of wind energy turbine set by booster stations and transmission line, two to three wind energy turbine set booster stations share one and collect the concentrated power transmission network accessing more voltage levels in station, jumbo static passive compensation device is generally equipped with, for maintaining wind farm grid-connected point (referring generally to the high-pressure side become of boosting) voltage in rational excursion in wind energy turbine set.Due to Wind turbines to and the voltage compare of site is responsive, when power transmission network or periphery wind energy turbine set generation catastrophe failure, easily cause the chain off-grid of large-scale wind power unit.The a lot of extensive blower fan chain off-grid accident analysis occurred for Jiuquan wind power base in 2011 and wind-light storage base, Zhangbei County is known, wind-powered electricity generation collects area and lacks the idle ability of regulation and control of effective associating, wind energy turbine set all with respective grid-connected point voltage for control objectives carries out independent regulation, especially station situation is collected for sharing, it is all target with high side voltage, each self-adjusting 35kV side reactive power compensator, the voltage of multiple node repeatedly regulates and lacks effective cooperation means, even may cause the situations such as reactive circular power flow.
Wind energy turbine set concentrates grid-connected area to lack effective control method for coordinating, and the Voltage Emergency Control in the conventional area of electrical network seen the main stream approach of bibliographical information have AVC system under urgent secondary voltage control, multi-control method distributed Voltage Emergency Control, voltage stabilization post-emergency control, the voltage cooperation control etc. based on multi-agent technology coordinated.The optimal control method that what wherein AVC method and distributed Voltage Emergency Control stressed be still based on Load flow calculation, amount of calculation is large, and control cycle is long; Voltage stabilization post-emergency control is still in essence based on multi-agent technology, based on the voltage cooperation control of multi-agent technology, be study from real-time control angle according to voltage feedback information, the method needs to gather a large amount of information, requires higher to real-time communication.These methods do not consider the characteristic of wind-powered electricity generation, all can not be directly used in wind energy turbine set and concentrate grid-connected area.
Above reactive voltage control method need concentrate grid-connected area feature to carry out adaptability reform for wind energy turbine set, has following patent to carry out relevant report.
Chinese patent literature CN101719676A, Shen Qing Publication day 2010-06-02, describe a kind of voltage control technology of wind energy turbine set, this technology is for the voltage cooperation control of windy electric field with transmission line, comprise voltage monitoring systems and windy field reactive voltage control method for coordinating, by loss optimizing algorithm being applied to comprehensive multiple wind energy turbine set and transmission line, reaching and shifting reactive load between local wind electric field and transmission line, loss is minimized.But above-mentioned technology mainly for be Reactive power control under normality, utilize wind energy turbine set on the spot information go to coordinate the wind energy turbine set of periphery close relation by off-line setting calculation control law, only adapt to the cooperation control between wind energy turbine set that among a small circle, several electrical links are clear and definite.
Chinese patent literature CN102769301A, Shen Qing Publication day 2012-11-07, describe a kind of wind electric field blower terminal voltage in the hole time voltage control method, the method is according to blower fan and wind farm grid-connected point voltage is in a safe condition or precarious position is carried out hiving off and taked different control measure, in adjustment wind energy turbine set, the blower fan of safe condition and static passive compensation device are to the Target of Reactive Power value of specifying to support the blower fan of precarious position, and Target of Reactive Power value is carried out COMPREHENSIVE CALCULATING by the voltage offset values of reactive source and idle allowance situation and drawn.But above-mentioned technology mainly for be cooperation control between the blower fan of inside, single wind-powered electricity generation station and static passive compensation device, in same field, electrical correlation is closely in situation, substantially identical with field voltage variation tendency, be difficult to hive off according to state to blower fan and static passive compensation device, also just can not carry out reactive complementation control.
Pertinent literature and patent, generally for be reactive voltage cooperation control between normal grid or a small amount of wind energy turbine set, what more focus on is optimal control under normality, for in emergency circumstances, wind-powered electricity generation concentrates the control method for coordinating between the wind energy turbine set in grid-connected area 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 object of the invention is: propose the reactive voltage emergency control method that a kind of wind energy turbine set concentrates access area, to overcome the deficiencies in the prior art part, make the static passive compensation device be distributed in many wind energy turbine set in certain area can carry out quicker more effective coordination, to reach the object in case of emergency jointly completing voltage cooperation control task.
Specifically, the present invention adopts following technical scheme to realize, and comprises the following steps:
1) each wind energy turbine set carries out automatically controlling with regard to ground voltage, gather electric information, carry out judging to determine whether take on the spot regulating strategy fast with regard to ground voltage situation, and be uploaded to centralized control center by electric information with after gathering in units of wind energy turbine set with regard to ground voltage situation judged result;
2) centralized control center gather periphery power transmission network electric information and each wind energy turbine set with regard to ground voltage situation judged result, sequence is carried out to wind energy turbine set busbar voltage degrees of offset and determines voltage modulated point, regular calculating and the dynamic reactive enabling capabilities upgrading local reactive source are estimated index and carry out the sequence of reactive power support ability, obtain 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 farm side control measure on the spot, and taking wind farm side on the spot after control measure, determine whether need neighboring area to participate in cooperation control according to the idle supply and demand situation in one's respective area; When the result of determination of urgent situation also meets the condition accelerating subsequent rounds action, then accelerate subsequent rounds action; When subarea integrated voltage situation result of determination is warning situation, then directly determine whether need neighboring area to participate in cooperation 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, is undertaken automatically controlling to maintain this grid-connected point voltage with regard to ground voltage by each wind energy turbine set and stablize;
Supply and demand situation display as idle in one's respective area is when the idle supply in one's respective area is more than or equal to maximum reactive requirement, then controlled separately by one's respective area, effective Controlling vertex scope is selected according to electrical correlation table by centralized control center, the regulation and control order of the reactive source in effective range of nodes is determined according to reactive source enabling capabilities table, determine often to take turns the reactive source number of adjustment and the Target of Reactive Power value of corresponding each reactive source according to the evaluation method of idle controlled quentity controlled variable, and control command is handed down to each relevant wind energy turbine set;
When the supply and demand situation display idle supply in one's respective area as idle in one's respective area is less than maximum reactive requirement, then select periphery electrical correlation closely and the larger region of Reactive Power Reserve as association's control region, the idle cooperation control concentrated is carried out by master control District integrated control center, calculate the overall Target of Reactive Power value in association's control region, the overall Target of Reactive Power value received is decomposed by association's control District integrated control center again, select suitable reactive source to participate in idle support, and control command is handed down to each relevant wind energy turbine set;
4) as each relevant wind energy turbine set successfully receives the control command that centralized control center issues, then each relevant wind energy turbine set according to the idle control objectives value that centralized control center issues carry out from main regulation with reach that centralized control center requires without work value;
Fail if any wind energy turbine set and receive the control command that centralized control center issues, then this wind energy turbine set is then still carried out autonomous voltage control according to set control strategy on the spot and is stablized to maintain this grid-connected point voltage.
Beneficial effect of the present invention is as follows: define subarea integrated voltage situation in the inventive method and judge, can select different control strategies fast by this judgement; The invention allows for electrical correlation table, reactive power support capability list, regulation and control range of nodes and reactive source regulation and control order can be determined fast by this two table, by idle controlled quentity controlled variable estimate calculate can calculate often wheel should the reactive source number of action, regulate and control successively according to the sequence in reactive power support capability list, the voltage of risk symptoms node can be recalled to safe range as early as possible.Consider by desirable reactive source characteristic compared to traditional, 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 considers static passive compensation device and have different responding abilities under different terminal voltage, its adaptability is stronger, more can provide reactive power support fast for point wind farm grid-connected under emergency.
Accompanying drawing explanation
Fig. 1 is that wind energy turbine set concentrates the reactive voltage emergency control method in grid-connected area to implement schematic diagram.
Fig. 2 is the general control scheme schematic diagram that wind energy turbine set concentrates grid-connected regional reactive voltage emergency control.
Fig. 3 is the flow chart that wind energy turbine set concentrates grid-connected regional reactive voltage emergency control method.
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 carrying out the running state information that communicates to obtain corresponding reactive source and idle allowance situation to blower fan centralized control system, static passive compensation device control system, to also site and periphery power transmission network electric information gather to judge local voltage condition, after information gathering above-mentioned in field gathers by each wind energy turbine set, in units of wind energy turbine set, concentrate the control website being uploaded to higher level.
(2) voltage situation judges: voltage situation carries out synthetic determination according to multiple voltage indexes to current voltage safe coefficient and variation tendency, wherein with regard to ground voltage situation according to busbar voltage average offset value, the busbar voltage average rate of change, transient voltage security nargin, idle supply and demand sudden change index four indexs judge, for determining whether preferentially take control measure on the spot, District integrated control center according to each wind energy turbine set with regard to ground voltage situation result of determination, transmission relation circuit electric information and subarea Reactive Power Reserve situation come voltage condition and the variation tendency of comprehensive descision one's respective area, subarea integrated voltage situation result of determination is used for decision and takes cooperation control or interval coordination control strategy in subarea, whether accelerate subsequent rounds responsiveness.
Specifically, average voltage offset target computational methods are:
If
Δ U in formula
cr, 1, Δ U
cr, 2be respectively warning magnitude of voltage and the critical off-grid magnitude of voltage of blower fan, 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),
for voltage fluctuation tolerance interval, general desirable 0.05p.u.
Average voltage rate of change computational methods are:
If
for the faulty action preventing degating region arranged, for voltage change ratio scene jumpy when 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 voltage sharply rate of change, can incorporation engineering experience be obtained by a large amount of simulation analysis.
Voltage security margin index calculating method is: from monitoring point voltage minimum lower than voltage protection threshold value U
cr, istart calculating voltage lower than U
cr, iduration Δ T
i, then Voltage security margin index is:
η＝(T
cr,i-ΔT
i)/T
cr,i(3)
If
T in formula
cr, ieach stage protection act time delay of corresponding blower fan under-voltage protection setting; η
b1, η
b2(0≤η
b2< η
b1< 1) be Voltage security margin threshold value, draw empirical value by a large amount of simulation analysis.
Idle supply and demand sudden change index calculating method is: assuming that reactive source (SVC or opening-closing capacitor bank etc.) concentrates reactive-load compensation equipment reactive power knots modification to be Δ Q in field
g, the total reactive requirement change of this blower fan shows as Δ Q
l, this and site under normal circumstances capacity of short circuit are S
sC, then idle change conversion to the index of change in voltage is:
ΔV
eff＝|(ΔQ
G-ΔQ
L)/S
SC| (4)
If
Δ V in formula
crrepresent the setting threshold value of voltage fluctuation, set according to operating experience.
Reactive Power Reserve index calculating method is: according to idle Real-time Balancing situation and available idle allowance, judge the safe coefficient of Reactive Power Reserve.When Reactive Power Reserve is not enough, carry out giving warning in advance or accelerate follow-up adjustment.Its computing formula is:
k
Q＝(ΣQ
G-ΣQ
L)/ΣQ
G(5)
Σ Q in formula
lfor the total reactive requirement of this subarea blower fan, Σ Q
gfor 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, the logical consequence according to R and K judges:
If
Formula (1) ~ (4) can be used for carrying out judging to draw that in region, each wind farm grid-connected point is with regard to ground voltage situation result with regard to ground voltage situation.On this basis, add the subarea Reactive Power Reserve index of formula (5), get final product the integrated voltage situation in this region of synthetic determination, thus judge the main region of fault effects, be set as emergency region, as the main object of regulation and control, have direct electrical link to periphery and the comparatively safe region of voltage situation can be elected to be association's control region, thus determine principal and subordinate's priority of control, contribute to outstanding voltage-controlled emphasis.According to voltage situation result of determination, some control measure on the spot can also be taked fast at emergency region, the extension of preventing accident or affecting.
(3) area coordination control model decision-making: area coordination control model decision-making selects corresponding control strategy according to integrated voltage situation result of determination, effective idle support range of nodes is selected again according to electrical correlation table, the reactive power support capability list of dynamic refresh is utilized to determine the regulation and control order of the reactive source Controlling vertex in effective range, calculating often wheel according to the predictor method of idle controlled quentity controlled variable should the reactive source number of action, carries out action according to reactive power support capability list.Wherein:
(3-1) electrical correlation table: the external world by Load flow calculation or according to artificial operating experience setup control node between after reactive voltage sensitivity, prior calculated off-line goes out different reactive source node to the correlation degree of Controlling vertex, preferentially carries out the range of nodes of idle regulation and control during to determine Controlling vertex voltage out-of-limit.This method guarantees that reactive source node provides reactive power support under the security constraint prerequisite meeting self, only need according to Controlling vertex status inquiry electrical correlation table to obtain effective range of nodes and corresponding reactive power/voltage control information during use.Its calculation expression is:
S in formula
m,nrepresent the voltage V of Controlling vertex m
kto reactive source node n reactive current i
nsensitivity;
represent reactive source node n available maximum reactive current enabling capabilities in safe range;
(it is decided by S to the reactive current limiting value of expression reactive source node n
m,nwith terminal voltage degrees of offset);
the voltage limits of reactive source node n corresponding during expression reactive current limiting value.
(3-2) reactive power support capability list: centralized control center carries out regular update according to the running state information of each reactive source collected, estimate index with the dynamic reactive enabling capabilities of certain control cycle to each reactive source and carry out rolling renewal calculating, carry out sequence by order from big to small to try to achieve, its calculation expression is:
In formula
for the reactive power support ability of reactive source j estimates index, U
tk () is the terminal voltage effective value of k moment reactive source, Δ Q
gjfor the idle allowance of reactive source, S
vQexert oneself for reactive source is idle to the voltage sensibility of Controlling vertex; I
n maxk () is for injecting the maximum dynamic reactive electric current of electric power system when reactive source under front voltage level; t
durfor reactive source dynamic reactive supports the duration; t
respfor reactive source response time (being switched to designated state spent time from current state); γ is the commutation factor response time being converted to variation, namely the start-up time of reactive source by its conversion to change in voltage between the starting period, and can by the busbar voltage average rate of change of k moment reactive source node
be similar to replacement.
(3-3) estimation of idle controlled quentity controlled variable: centralized control center is according to subarea integrated voltage situation and reactive power support capability list, make it return to normal range (NR) as early as possible for control objectives with the voltage regulating and controlling risk symptoms node, carry out the estimation of idle controlled quentity controlled variable according to following expression:
In formula: V
crk node (risk symptoms node) that () is maximum for busbar voltage offsets is at the busbar voltage effective value in k moment; S
vcr, QGjfor the idle voltage control sensitivity to risk symptoms node of reactive source j; Δ Q
gjk (), for reactive source j is in k moment maximum available idle amount, is determined by reactive power support capability list; V
cr, ifor the off-grid voltage threshold of the different phase of blower voltage protection definite value setting; ε is the regulating and controlling voltage allowance of setting; N is adjustable reactive source number.
(4) centralized control with control on the spot: preferentially carry out wind energy turbine set fast reactive regulating and controlling voltage on the spot, when voltage is recalled in safe range by this impotentia, unified cooperation control is carried out by centralized control center, according to " voltage layering and zoning controls, take different control strategy stage by stage on the spot " control thinking, utilize electrical correlation table and reactive power support capability list, the Target of Reactive Power value of each control website is calculated by idle controlled quentity controlled variable predictor method, the each control website Target of Reactive Power value calculated issues by centralized control center again, the Target of Reactive Power value that each wind energy turbine set control station on site issues according to centralized control center is carried out from main regulation, adjust to required value as early as possible.
The wind energy turbine set introduced in Fig. 1 concentrates the reactive voltage emergency control method embodiment in grid-connected area, by electric information acquisition module, communication network, forms with regard to major parts such as ground voltage situation judge module, subarea integrated voltage situation judge module, area coordination control model decision-making module, reactive power support capacity calculation module, electrical correlation table administration module and Local Controllers.Wherein electric information acquisition module obtains this running of wind generating set information by communicating with blower fan centralized control center, by with static passive compensation device (as SVC, STATCOM etc.) control system communication obtain the running state information in dynamic reactive source, by gather wind farm grid-connected point and send power transmission line critical electrical amount of information judge wind energy turbine set with regard to ground voltage situation with determine whether take fast control strategy on the spot, measurement group is by wind electric field blower operation information, reactive source running state information, website is controlled by communication network being given higher level after gathering with regard to tripartite's surface informations such as ground voltage situation result of determination.
District integrated control center is made up of parts such as subarea integrated voltage situation module, reactive source enabling capabilities computing module, electrical correlation table administration module and area coordination control model decision-making modules.Subarea integrated voltage situation module is according to the information that wind energy turbine set each in region is sent, and the electric information of comprehensive periphery power transmission network judges the integrated voltage situation in this subarea fast, determines to take cooperation control or interval coordination control strategy in district.Reactive source enabling capabilities computing module carries out rolling according to the reactive source running state information dynamically updated by certain control cycle and upgrades calculating, and result of calculation is sorted by order from big to small, ranking results is supplied to area coordination control model decision-making module.Electrical correlation table administration module is responsible for renewal and the management of electrical correlation table, inquiry service is provided, after area coordination control model decision-making module provides risk symptoms node information, this module need provide effective Controlling vertex scope of coupling and reactive voltage sensitivity corresponding to each node.Area coordination control model decision-making module is in conjunction with subarea integrated voltage situation result of determination, the node selecting variation the most serious is as risk symptoms node, inquiry electrical correlation table obtains effective Controlling vertex scope, inquiry reactive source enabling capabilities table obtains the real-time enabling capabilities of the reactive source of corresponding Controlling vertex, dynamic order is carried out to the regulation and control order of the reactive source in effective range and obtains corresponding reactive source enabling capabilities sublist, determining often to take turns according to idle controlled quentity controlled variable predictor method should the reactive source of action, control by reactive source regulation and control order in reactive source enabling capabilities sublist, issue corresponding each reactive source and control Target of Reactive Power value, the Target of Reactive Power value that Local Controller issues according to centralized control center is carried out from main regulation, reach control overflow value as early as possible.
Fig. 2 is the general control scheme schematic diagram that wind energy turbine set concentrates grid-connected regional reactive voltage emergency control method, be the control thinking according to " voltage layering and zoning controls; take Different Strategies stage by stage on the spot ", control strategy and centralized control center's strategy on the spot can be divided into, specifically:
(1) control strategy (saging) on the spot
First stage, the low voltage crossing stage: Wind turbines utilizes self idle ability of regulation and control (low voltage crossing controls, net side converter SVG state is run, promptly fall meritorious additional issue idle etc.), maintain grid-connected as far as possible, provide suitable reactive current to support in conjunction with own situation; STATCOM, SVC press equipment set control strategy autonomous operation (generally direct send out maximum idle), and when voltage seriously falls, SVC protection act carries out locking (exceeding the fixed time lower than 0.60p.u);
Second stage, the voltage resume stage: when rate of voltage rise is too fast, can cut-out Capacitor banks fast; If when voltage recovery rate slows down or returns in fence coverage, then need locking tactful on the spot, to centralized control center's application voltage cooperation control, assign control command after carrying out concentrated coordination optimization by centralized control center according to local information, Local Controller takes corresponding control measure according to control command.SVC releasing process is with zero idle heavy throwing, according to the control strategy action of centralized control center's centralized optimization decision-making, is switched to corresponding control model fast.
(2) centralized control center's strategy (subarea cooperation control)
Centralized control center's strategy need 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 farm side control measure on the spot fast, adjacent control website directly provides maximum reactive power support, to weaken the order of severity and the coverage of variation, after taking corresponding control measure on the spot, carry out voltage situation on the spot judge, judge voltage resume situation, if when the fast quick-recovery of voltage may cause fatal voltage overshooting problem, take latch portion SVC in advance to excise the strategy of Capacitor banks even fast; If voltage recovery rate in the reasonable scope time, adopt the coordination control strategy of centralized control center.
When integrated voltage situation result of determination is warning situation or urgent situation but has taken certain measure on the spot, adopt the subarea coordination control strategy of centralized control center, subarea is carried out reactive requirement amount and is estimated calculating, when reactive requirement is greater than the maximum idle supply capacity in one's respective area, adjacent association's control region is found according to electrical correlation degree and Reactive Power Reserve situation, apply for idle support to it, association's control region is according to reactive source enabling capabilities sequencing table determination reactive source regulation and control sequential list; When reactive requirement increment is less than one's respective area Reactive Power Reserve, subarea cooperation control decision-making module, according to reactive source enabling capabilities sequencing table determination reactive source regulation and control sequential list, carries out follow-up adjustment according to Voltage Feedback situation.
Fig. 3 is the flow chart that wind energy turbine set concentrates grid-connected regional reactive voltage emergency control method, according to the control sequence coordinate-controlled 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 controls automatically with regard to ground voltage, be responsible for gathering electric information and carrying out judging to take on the spot regulating strategy fast with regard to ground voltage situation, and be uploaded to higher level's control station by electric information with after gathering in units of wind energy turbine set with regard to ground voltage situation result.
Second step is that higher level's control station (centralized control center) gathers periphery power transmission network electric information and each wind energy turbine set with regard to ground voltage situation result of determination, sequence is carried out to wind energy turbine set busbar voltage degrees of offset and determines risk symptoms node (voltage modulated point), regularly to calculate and the dynamic reactive enabling capabilities that upgrades local reactive source is estimated index and carries out the sequence of reactive power support ability.
3rd Bu Shi centralized control center carries out subarea integrated voltage situation and judges, different control strategies (referring to the explanation of Fig. 2 general control scheme part) is selected according to result of determination, determine whether need neighboring area to participate in cooperation control according to the idle supply and demand situation in one's respective area, when the idle supply in one's respective area is greater than maximum reactive requirement, controlled separately by one's respective area, effective Controlling vertex scope is selected according to electrical correlation table by centralized control center, the regulation and control order of the reactive source in effective range of nodes is determined according to reactive power support ability sequencing table, determine often to take turns the reactive source number of adjustment and the Target of Reactive Power value of corresponding each reactive source according to idle controlled quentity controlled variable evaluation method, when the idle supply in one's respective area is less than maximum reactive requirement, need to select periphery electrical correlation closely and the larger region of Reactive Power Reserve as association's control region, the idle cooperation control concentrated is carried out by master control District integrated control center, calculate the overall Target of Reactive Power value in association's control region, the overall Target of Reactive Power value received is decomposed by association's control District integrated control center again, select suitable reactive source to participate in idle support, issue the Target of Reactive Power value that selected reactive source is corresponding.
4th step is that the idle control objectives value that Local Controller is assigned according to centralized control center is carried out from main regulation, reach as early as possible higher level request without work value, when communication network is abnormal cause that Local Controller is unsuccessful receives superior instructions time, then still carry out autonomous voltage control according to set control strategy on the spot, maintain this grid-connected point voltage in the reasonable scope.
Although the present invention with preferred embodiment openly as above, embodiment is not of the present invention for limiting.Without departing from the spirit and scope of the invention, any equivalence change done or retouching, belong to the protection range of the present invention equally.Therefore the content that protection scope of the present invention should define with the claim of the application is standard.
Claims (5)
1. wind energy turbine set concentrates the reactive voltage emergency control method in grid-connected area, it is characterized in that, comprises the steps:
1) each wind energy turbine set carries out automatically controlling with regard to ground voltage, gather electric information, carry out judging to determine whether take on the spot regulating strategy fast with regard to ground voltage situation, and be uploaded to centralized control center by electric information with after gathering in units of wind energy turbine set with regard to ground voltage situation judged result;
2) centralized control center gather periphery power transmission network electric information and each wind energy turbine set with regard to ground voltage situation judged result, sequence is carried out to wind energy turbine set busbar voltage degrees of offset and determines voltage modulated point, regular calculating and the dynamic reactive enabling capabilities upgrading local reactive source are estimated index and carry out the sequence of reactive power support ability, obtain 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 farm side control measure on the spot, and taking wind farm side on the spot after control measure, determine whether need neighboring area to participate in cooperation control according to the idle supply and demand situation in one's respective area; When the result of determination of urgent situation also meets the condition accelerating subsequent rounds action, then accelerate subsequent rounds action; When subarea integrated voltage situation result of determination is warning situation, then directly determine whether need neighboring area to participate in cooperation 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, is undertaken automatically controlling to maintain this grid-connected point voltage with regard to ground voltage by each wind energy turbine set and stablize;
Supply and demand situation display as idle in one's respective area is when the idle supply in one's respective area is more than or equal to maximum reactive requirement, then controlled separately by one's respective area, effective Controlling vertex scope is selected according to electrical correlation table by centralized control center, the regulation and control order of the reactive source in effective range of nodes is determined according to reactive source enabling capabilities table, determine often to take turns the reactive source number of adjustment and the Target of Reactive Power value of corresponding each reactive source according to the evaluation method of idle controlled quentity controlled variable, and control command is handed down to each relevant wind energy turbine set;
When the supply and demand situation display idle supply in one's respective area as idle in one's respective area is less than maximum reactive requirement, then select periphery electrical correlation closely and the larger region of Reactive Power Reserve as association's control region, the idle cooperation control concentrated is carried out by master control District integrated control center, calculate the overall Target of Reactive Power value in association's control region, the overall Target of Reactive Power value received is decomposed by association's control District integrated control center again, select suitable reactive source to participate in idle support, and control command is handed down to each relevant wind energy turbine set;
4) as each relevant wind energy turbine set successfully receives the control command that centralized control center issues, then each relevant wind energy turbine set according to the idle control objectives value that centralized control center issues carry out from main regulation with reach that centralized control center requires without work value;
Fail if any wind energy turbine set and receive the control command that centralized control center issues, then this wind energy turbine set is then still carried out autonomous voltage control according to set control strategy on the spot and is stablized to maintain this grid-connected point voltage.
2. wind energy turbine set according to claim 1 concentrates the reactive voltage emergency control method in grid-connected area, it is characterized in that, described subarea integrated voltage situation judges, come synthetic determination current voltage safe coefficient and variation tendency according to busbar voltage average offset value, the busbar voltage average rate of change, transient voltage security nargin, Reactive Power Reserve situation and idle supply and demand sudden change index, and determined by multinomial reactive voltage index of correlation synthetic determination result, each index is respectively as shown in the formula shown in (1) ~ (5), and corresponding computational methods are respectively:
Average voltage offset target
computational methods be:
If
Δ U in formula
cr, 1, Δ U
cr, 2be respectively warning magnitude of voltage and the critical off-grid magnitude of voltage of blower fan,
for voltage fluctuation tolerance interval,
for the busbar voltage average offset value that the k moment calculates, 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;
Average voltage rate of change
computational methods be:
If
In formula, Δ T is the counting period,
for the faulty action preventing degating region arranged, for voltage change ratio scene jumpy when 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 voltage sharply rate of change; 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 margin index η are:
η＝(T
cr,i-ΔT
i)/T
cr,i(3)
If
Δ T in formula
ifor voltage is lower than voltage protection threshold value U
cr, iduration, this duration from monitoring point voltage minimum lower than U
cr, iin time, starts to calculate, T
cr, ifor each stage protection act time delay of blower fan under-voltage protection setting; η
b1, η
b2for Voltage security margin 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 formula
gfor reactive source in field concentrates the reactive power knots modification of reactive-load compensation equipment, Δ Q
lfor the total reactive requirement change of this blower fan, S
sCfor this and site capacity of short circuit under normal circumstances, Δ V
crfor the setting threshold value of voltage fluctuation; R
4it is the 4th warning situation logical consequence value;
Reactive Power Reserve index k
qcomputational methods be:
k
Q＝(ΣQ
G-ΣQ
L)/ΣQ
G(5)
If
Σ Q in formula
lfor the total reactive requirement of this subarea blower fan, Σ Q
gfor 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 R be total warning situation logical consequence value, K is total urgent situation logical consequence value, then have R=R
1∪ R
2∪ R
3∪ R
4∪ R
5, K=K
1∪ K
2∪ K
3∪ K
5, the logical consequence according to R and K judges:
If
3. wind energy turbine set according to claim 1 concentrates the reactive voltage emergency control method in grid-connected area, it is characterized in that, described reactive source enabling capabilities table, be estimate index by quasi real time rolling calculation dynamic reactive enabling capabilities, carry out sequence try to achieve by order from big to small, its calculation expression is:
In formula
for reactive source reactive power support ability, U
tk () is the terminal voltage effective value of k moment reactive source, Δ Q
gjfor the idle allowance of reactive source, S
viQjexert oneself for reactive source is idle to the voltage sensibility of Controlling vertex, γ is the commutation factor response time being converted to variation, I
nmaxk () is for injecting the maximum dynamic reactive electric current of electric power system, t when reactive source under front voltage level
durfor the duration that reactive source dynamic reactive supports, t
respfor the reactive source response time,
for the busbar voltage average rate of change of k moment reactive source node j.
4. wind energy turbine set according to claim 1 concentrates the reactive voltage emergency control method in grid-connected area, it is characterized in that, described electrical correlation table, between known control node after reactive voltage sensitivity, prior calculated off-line goes out the correlation degree of reactive source node to different Controlling vertex, in order to determine and node electrical link idle regulation and control range of nodes closely, its calculation expression is:
EC in formula
m,nrepresent that reactive source node n is to the correlation degree of Controlling vertex m, S
m,nrepresent the voltage V of Controlling vertex m
mto reactive source node n reactive current i
nsensitivity, S
n,nrepresent reactive source node voltage V
nto own reactive current i
nsensitivity,
represent reactive source node n available maximum reactive current enabling capabilities in safe range,
represent reactive source node n reactive current limiting value,
represent the voltage limits of corresponding reactive source node n during reactive current limiting value, i
nrepresent reactive source node n reactive current instantaneous value, V
nrepresent the voltage effective value of reactive source node n.
5. wind energy turbine set according to claim 1 concentrates the reactive voltage emergency control method in grid-connected area, it is characterized in that, the evaluation method of described idle controlled quentity controlled variable is: first determine that contact regulates and controls reactive source range of nodes closely according to electrical correlation table, actual adjustable reactive source number is determined again by reactive source enabling capabilities table, comprehensive above two table results, obtain by the target inequality meeting formula (9) the reactive source number and pondage that often wheel should regulate;
V in formula
cr(k) node maximum for busbar voltage offsets at the busbar voltage effective value in k moment, S
vcr, QGjfor the idle voltage control sensitivity to risk symptoms node of reactive source j, Δ Q
gjk () is reactive source j in k moment maximum available idle amount, V
cr, ifor the off-grid voltage threshold of the different phase of blower voltage protection definite value setting, ε is the regulating and controlling voltage allowance of setting; N is adjustable reactive source number.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310202134.7A CN103248056B (en) | 2013-05-25 | 2013-05-25 | Reactive voltage emergency control method in concentrated grid connecting area of wind power plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310202134.7A CN103248056B (en) | 2013-05-25 | 2013-05-25 | Reactive voltage emergency control method in concentrated grid connecting area of wind power plant |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103248056A CN103248056A (en) | 2013-08-14 |
| CN103248056B true CN103248056B (en) | 2015-07-08 |
Family
ID=48927363
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310202134.7A Active CN103248056B (en) | 2013-05-25 | 2013-05-25 | Reactive voltage emergency control method in concentrated grid connecting area of wind power plant |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103248056B (en) |
Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103956750B (en) * | 2014-04-23 | 2016-08-24 | 国家电网公司 | Wind-powered electricity generation is concentrated and is sent the idle work optimization system and method controlling voltage pulsation under pattern |
| CN105720585B (en) * | 2014-12-02 | 2018-11-20 | 国家电网公司 | The reactive power control method and system of wind power plant cluster |
| CN104638654B (en) * | 2015-02-02 | 2017-01-25 | 东南大学 | STATCOM (static synchronous compensator) control method for voltage adjusting of wind farm and network nodes |
| CN105048506B (en) * | 2015-08-28 | 2017-06-16 | 国家电网公司 | Using collecting the method that line switching realizes photovoltaic plant active power emergent control |
| CN105610171B (en) * | 2016-02-24 | 2020-10-13 | 国家电网公司 | Minimum startup sequence optimization method based on unit load dynamic reactive response |
| CN105912835B (en) * | 2016-03-15 | 2018-04-17 | 华侨大学 | A kind of power circuit fragility identification model method for building up counted and wind power plant accesses |
| CN107769218B (en) * | 2017-11-23 | 2020-11-20 | 国网江苏省电力公司南京供电公司 | Comprehensive coordination control strategy for reactive voltage of power distribution network |
| CN108270244B (en) * | 2018-01-26 | 2022-08-09 | 国网辽宁省电力有限公司 | Method for scheduling new energy power system in multiple control domain operation modes |
| CN108400619A (en) * | 2018-02-06 | 2018-08-14 | 北京天润新能投资有限公司 | A kind of Fan Regulation method and system based on AVC systems |
| CN111756061B (en) * | 2020-05-19 | 2022-03-11 | 国电南瑞科技股份有限公司 | Static security domain control method and system considering new energy power grid faults and prediction |
| CN112736991B (en) * | 2020-12-23 | 2023-08-22 | 四川大学 | Novel active voltage control strategy for doubly-fed wind power plant |
| CN113258590B (en) * | 2021-05-12 | 2023-06-06 | 山东大学 | Method and system for controlling voltage of AC/DC system in stages under high wind power permeability |
| CN112994028B (en) * | 2021-05-24 | 2021-07-23 | 广东电网有限责任公司中山供电局 | Virtual power plant reactive voltage rapid adjustment method and device |
| CN114200231A (en) * | 2021-12-03 | 2022-03-18 | 国网青海省电力公司电力科学研究院 | Test method for SVG low voltage ride through characteristic |
| CN116521304B (en) * | 2023-07-04 | 2023-12-01 | 四川易诚智讯科技有限公司 | Method and system for generating and displaying structured fine granularity plan |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1035626A2 (en) * | 1999-03-09 | 2000-09-13 | The Kansai Electric Power Co., Inc. | Power system control apparatus and relative method |
| CN1630157A (en) * | 2003-08-18 | 2005-06-22 | 通用电气公司 | Continuous reactive power support for wind turbine generators |
-
2013
- 2013-05-25 CN CN201310202134.7A patent/CN103248056B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1035626A2 (en) * | 1999-03-09 | 2000-09-13 | The Kansai Electric Power Co., Inc. | Power system control apparatus and relative method |
| CN1630157A (en) * | 2003-08-18 | 2005-06-22 | 通用电气公司 | Continuous reactive power support for wind turbine generators |
Non-Patent Citations (1)
| Title |
|---|
| 《变速恒频双馈电机风电场电压控制策略》;曹军等;《电力系统自动化》;20090225;第33卷(第4期);第87-第91页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103248056A (en) | 2013-08-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103248056B (en) | Reactive voltage emergency control method in concentrated grid connecting area of wind power plant | |
| CN101931241B (en) | Wind farm grid-connected coordination control method | |
| CN102611118B (en) | Method for comprehensively controlling reactive voltage of wind farm with imported prediction method | |
| CN103746408B (en) | Large-scale wind power AGC control method for coordinating | |
| CN106992526B (en) | A kind of the photovoltaic access distribution network voltage control system and method for layered distribution type | |
| CN105720585B (en) | The reactive power control method and system of wind power plant cluster | |
| CN103812219A (en) | Multiple-energy storage power station combined remote monitoring system | |
| CN103715700A (en) | Reactive power control system and control method applicable to wind farm grid-connection point voltage control | |
| CN103855721A (en) | A system for connecting wind farm monitoring system into power grid dispatching system and information exchange method | |
| CN108134394B (en) | Optimized load shedding method considering distributed power supply influence | |
| CN104319775A (en) | Reactive power voltage control method applicable to large-scale wind power integration | |
| WO2022252382A1 (en) | Source-grid-load-storage networked coordinated frequency control method | |
| CN104810840A (en) | Full-network voltage and reactive power optimization control system and control method thereof | |
| CN104283222A (en) | Regional power grid reactive voltage control system | |
| CN108365627A (en) | A kind of wind storage isolated network power supply system control method for coordinating based on flexible coordinating factor | |
| CN105356480A (en) | Photovoltaic power station static reactive power control method | |
| CN104167740B (en) | 500kV substation 35kV electric capacity reactance works in coordination with automatic control system and method with economizing | |
| CN105896550A (en) | Monitoring method of intelligent reactive power compensation system | |
| CN109546677B (en) | Safety control strategy solving method for large-scale offshore wind power flexible sending-out system | |
| CN202888859U (en) | Building photovoltaic grid-connected system | |
| CN112865139B (en) | Optimization control strategy for energy storage power station to safely participate in primary frequency modulation of power grid | |
| CN104578080A (en) | Low-voltage treatment method for rural power grid | |
| CN105490279A (en) | Dichotomy-based local voltage control method for distributed power supply | |
| CN204407900U (en) | For the regulator control system that rural area low-voltage electrical network is administered | |
| CN104319779B (en) | Regional power grid reactive voltage control method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| ASS | Succession or assignment of patent right |
Owner name: STATE GRID CORPORATION OF CHINA Free format text: FORMER OWNER: NANJING NARI CO., LTD. Effective date: 20141125 Owner name: NANJING NARI CO., LTD. NARI TECHNOLOGY DEVELOPMENT Effective date: 20141125 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 210003 NANJING, JIANGSU PROVINCE TO: 100031 XICHENG, BEIJING |
|
| TA01 | Transfer of patent application right |
Effective date of registration: 20141125 Address after: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Applicant after: State Grid Corporation of China Applicant after: Nanjing Nari Co., Ltd. Applicant after: NARI Technology Development Co., Ltd. Address before: Nan Shui Road Gulou District of Nanjing city of Jiangsu Province, No. 8 210003 Applicant before: Nanjing Nari Co., Ltd. |
|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Co-patentee after: NARI Group Corp. Patentee after: State Grid Corporation of China Co-patentee after: NARI TECHNOLOGY Co.,Ltd. Address before: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Co-patentee before: Nanjing Nanrui Group Co. Patentee before: State Grid Corporation of China Co-patentee before: NARI TECHNOLOGY Co.,Ltd. |
|
| CP01 | Change in the name or title of a patent holder |