CN102074969B - Wind power plant and operation method for same - Google Patents
Wind power plant and operation method for same Download PDFInfo
- Publication number
- CN102074969B CN102074969B CN200910223822.5A CN200910223822A CN102074969B CN 102074969 B CN102074969 B CN 102074969B CN 200910223822 A CN200910223822 A CN 200910223822A CN 102074969 B CN102074969 B CN 102074969B
- Authority
- CN
- China
- Prior art keywords
- wind power
- power station
- voltage
- turbine generator
- wind turbine
- 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.)
- Expired - Fee Related
Links
Images
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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
-
- 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
Abstract
The invention relates to an operation method for a wind power plant. In the method, the electrical energy produced by the wind power plant can be transmitted to a transformer station (12) through an internal power grid (11) of the wind power plant. Before the electrical energy is fed to an external power grid (14), the electrical energy is converted into a voltage, and the voltage is one optional transformation ratio higher than that of the internal power grid (11) of the wind power plant. According to the method, electrical load of a wind generating set (10) of the wind power plant can be determined, and the transformation ratio can be adjusted according to the electrical load of the wind generating set (10). In addition, the invention also relates to the wind power plant capable of implementing the method. By the method, the voltage in the internal power grid (11) of the wind power plant can be affected, so that the wind generating set (10) bears low electrical load.
Description
Technical field
The present invention relates to a kind of operation method of wind power station, in described method, the electric energy that wind power station produces can flow to Yi Ge transformer station by wind power station internal electric network.Before electric energy is fed to external electrical network, can be converted into a kind of voltage, the high optional transformation ratio of voltage of this voltage ratio wind power station internal electric network.In addition, the invention still further relates to a kind of wind power station with transformer station, in described transformer station, the electric energy that wind power station can be produced is fed to external electrical network from the internal electric network of wind power station.Wind power station comprises a kind of shunting switch and a wind power generation station control, and described shunting switch is for regulating the transformation ratio between wind power station internal electric network voltage and external electrical network voltage, and described controller is for setting a transformation ratio to shunting switch.
Background technology
In wind power station, the electric energy of being produced by wind turbine generator generally for example, flows to transformer station with voltage (: 20 kilovolts) by a kind of medium voltage network.To give external electrical network (being generally high-voltage fence) power delivery, need to utilize transformer to load a voltage (for example: 110 kilovolts) to electric energy.If there is variation in the voltage in high-voltage fence, to guarantee in the following way that so the voltage in medium voltage network keeps stable, that is, adjust the transformation ratio between high pressure and middle pressure.This point was disclosed in the prior art.
As everyone knows, in when generating, wind turbine generator depends primarily on the following aspects,, with the electric energy of assigned voltage, just can be fed to wind power station internal electric network that is, and wherein, described voltage only allows there is slight deviations with rated voltage.If voltage lower than rated voltage, will need higher electric current could export rated power so.And higher electric current can cause increasing the load of wind turbine generator electric elements (generator, cable, transformer etc.).For fear of overload, in this case, starting to limit effective power, first generally can limit reactive power.If in contrast, the voltage in the internal electric network of wind power station, higher than rated voltage, so equally also can cause each element overload of wind turbine generator, for example: current transformer overload.This voltage also must fluctuate up and down in rated voltage in a narrower frequency band, so that wind turbine generator meets again the regulation of reactive power in output rated power.Even when wind turbine generator is moved in allowed limits, if moved in the situation that approaching system limits value, the load of wind turbine generator also can rise so.At system limits value edge, operation also can reduce the useful life of wind turbine generator, thereby causes maintenance cost to increase.
Summary of the invention
According to the prior art described in beginning herein, task of the present invention is, introduces a kind of operation method and a kind of wind power station of wind power station, utilizes described method and wind power station can reduce the load of wind power station wind turbine generator.By the feature described in independent claims, can solve this task.Favourable execution mode of the present invention has been described in the dependent claims.
First explain several concepts.A wind power station comprises at least one wind turbine generator, but generally can comprise many wind turbine generator, and in described wind turbine generator, the rotational energy of rotor can change into electric energy by a generator.By a kind of wind power station internal electric network, ， transformer station of power delivery Gei Yige transformer station will can be loaded to higher voltage to electric energy, and be fed to external electrical network.Voltage ratio between external electrical network and wind power station internal electric network is just called transformation ratio.Under framework of the present invention, transformation ratio can be selected, and can a minute multistep regulates or carry out step-less adjustment.
In the prior art, shunting switch is a kind of for adjusting the instrument of transformation ratio.In large-scale power supply network, shunting switch can be for regulating the voltage in high-voltage fence, and can not change the voltage in medium voltage network simultaneously.About wind turbine generator, in patent WO 2006/120033 A2, advised transforming with shunting switch the reactive power set point of external electrical network.If but operation shunting switch, the voltage of wind power station internal electric network also can change so.The controller of each wind turbine generator in the following way equalizing voltage changes, that is, and and controller or the ratio of raising reactive power, or the ratio of reduction reactive power.
The electric loading of wind turbine generator is the load that electrical energy flows causes when each element of wind turbine generator.For example: can measure electric loading according to real-time apparent power (or apparent current) and the apparent power (or apparent current) of maximum possible.
For example: described in invention, can measure in the following way electric loading, that is, the ，Kan working point, working point of observing and detect wind turbine generator can keep much from the distance of wind turbine generator system edges.If overtension on present operating point, to such an extent as to want ovennodulation current transformer, so just represent that the electric loading of working point is higher.On the contrary, if brownout, to such an extent as to higher electric current could heat each electric elements (as: generator, cable, transformer) of wind turbine generator, so equally also there will be higher electric loading.If found higher electric loading, according to method of the present invention, can regulate transformation ratio so, thereby make to occur in the internal electric network of wind power station a new most suitable voltage.Wind turbine generator can utilize new voltage by the electric energy output of producing, and obtains therefrom a new working point with lower electric loading.The load of wind turbine generator will reduce like this.
In a kind of favourable execution mode, can draw in the following way the electric loading of wind turbine generator,, the voltage U of the electric energy of producing in wind turbine generator and a kind of idle component Q and U-Q characteristic curve are compared, wherein, idle component is appreciated that to be a total concept, and it comprises the various forms of expression, as: reactive current, reactive power, phase angle etc.U-Q characteristic curve can be understood in the following manner.The generator of wind turbine generator can be produced the electric energy that voltage is lower, when described voltage is most of between 400 volts to 6 kilovolts.Before electric energy is fed to wind power station internal electric network, can utilize relatives of Taiwan compatriots living on the Mainland electric energy to be loaded on to the middle pressure of 20 kilovolts in the transformer of wind turbine generator.Transformer by wind turbine generator both can electric energy transmitting real component, idle component that again can electric energy transmitting.Which kind of voltage operating transformer is the ability of known transformer transmission idle component depend on.In one end of allowed voltage range, wind turbine generator can have no restriction and produce electric capacity idle component (blasting operation), and when transmission inductance idle component (underexcitation operation), it can be quickly near its system edges.At the other end of allowed voltage range, wind turbine generator can produce good inductance idle component, and when transmission electric capacity idle component, it can be quickly near its system edges.In patent DE 10 2,008 018 748, describe this relation in detail.If we observe the U-Q characteristic curve of deriving according to this understanding, we will find so, and the rectangle desired with us (if the ability of transmission idle component is identical in the voltage range of whole permission) compared and lacked two angles.The characteristic shape approximation of U-Q forming is like this in a rhombus.If we observe the U-Q characteristic curve of wind power station internal electric network side, we can find so, and when voltage is higher, the ability that is fed to electric capacity idle component will reduce, and when voltage is lower, the ability of feed inductor idle component will reduce.And at generating pusher side, just in time contrary.Under framework of the present invention, preferably consider the voltage U of wind power station internal electric network side, but the voltage of the pusher side of equally also can considering to generate electricity.U-Q characteristic curve can be exported how much power and change depending on wind turbine generator.When effective power is lower, be fed to the large percentage of reactive power.But the shape that U-Q characteristic curve is similar to rhombus can remain unchanged.
If we choose a wind turbine generator working point being defined by voltage U and idle component Q, and itself and U-Q characteristic curve are contrasted, when working point is all far from the characteristic all edges of U-Q, just illustrate that the electric loading of wind turbine generator is lower so.If working point is near the characteristic edge of U-Q, electric loading will become large so.If working point compare with rectangle lack right angle place near the characteristic edge of U-Q, this will be reduces the typical reaction of idle component Q so, and will tolerate that wind turbine generator can not meet the requirement of reactive power set point again.Under framework of the present invention, replace, can be by regulating the mode of transformation ratio to adjust the voltage of wind power station internal electric network.Like this, the working point of wind turbine generator can from the characteristic edge of U-Q away from, the electric loading of wind turbine generator also can reduce.Utilize the gap drawing thus can improve idle component Q, thereby again meet the requirement of reactive power set point.
Not only can observe working point from the characteristic distance of U-Q, in characteristic curve, for each working point, can find out, the in the situation that of needs, whether it can also provide extra electric capacity or inductance idle component.Provide the ability of extra capacitor or inductance idle component to be called the pre-allowance of reactive power.Whether idea of the present invention is can provide enough pre-allowances of reactive power to adjust the transformation ratio between wind power station internal electric network voltage and external electrical network voltage according to the working point of wind turbine generator.
A wind power station generally comprises many wind turbine generator.If the transformation ratio between wind power station internal electric network voltage and external electrical network voltage has changed, what this related to so is not an independent wind turbine generator, and relates to all wind turbine generator of wind power station.If we implement method of the present invention, so when there is a higher electric loading in single wind generator group, there is variation in transformation ratio, although this can reduce the electric loading of this wind turbine generator, also may improve the electric loading of other wind turbine generator simultaneously.Preferably when surpassing the limiting value of regulation, the majority of wind power station or the wind turbine generator of some just regulate transformation ratio.
For adjusting the shunting switch of transformation ratio, higher wearing and tearing can be suffered, and limited on-off times can only be withstood.Therefore,, while only having the loss causing when the wearing and tearing of obtained interests higher than shunting switch that wind turbine generator is lightened the burden, be just worth regulating transformation ratio.For example: just can reach this point in the following way, that is, only have while meeting a strict condition, just can operate shunting switch.Condition may be: the electric loading of increase must (for example: more than one minute or more than ten minutes) just be reported after a period of time through regulation.Also may be other standard, that is, whole wind power station can not provide desired reactive power again, or has surpassed the temperature extremes of wind turbine generator.In addition, the action of shunting switch also depends on, within the time period in a past, (for example: 30 minutes, 24 hours or one month) switch motion of a switch motion or certain number of times had just occurred.
Particularly can make the decision that whether operates shunting switch according to following standard.The average voltage in a period of time can be considered, while only having average bits in stipulated time section on the limiting value of regulation, just shunting switch can be operated.So just can avoid, when short time voltage changes, operate shunting switch.In addition, also can consider next periodic maintenance of wind turbine generator time period before.Our starting point is, between twice maintenance, shunting switch has only allowed the switch motion of stipulated number, so just can at any time determine, upper, can also carry out how many times switch motion before once safeguarding.If the time before safeguarding is also long, but does not have switch motion to have used next time, will improve the standard that excites a switch motion so, vice versa.In addition, exciting of a switch motion also can be depended on a kind of cost-benefit analysis.The expense that can calculate simply each switch motion according to the switch motion number of times between twice maintenance and maintenance cost is how many.Can also utilize following information equally, that is, and because wind turbine generator needs the power feed reducing can produce which expense compared with high electric loading.For example: the expense of a switch motion is 25 Euros, and be also 25 Euros by reduced the cost that power feed produces in 15 minutes, if wind turbine generator can be fed to operation with full power within the more than 15 minutes time periods, rather than the mode that reduces power feed moves, a switching process is more significant in economy so.The decision of relevant operation shunting switch can be depended on above one or more standard.In wind power generation station control, can arrange one and can do the analysis module of making decision.In addition, can also according to following mode Allocation Analysis module, that is, according to the state parameter of current effective power output and/or average voltage and/or shunting switch, from a plurality of U-Q characteristic curves, select a suitable U-Q characteristic curve.
If the electric loading of wind power station wind turbine generator is very high, and working point from desired region also very away from, shunting switch can regulate a plurality of grades by transformation ratio in a switch motion so.
On the contrary, regulating the precondition of transformation ratio to force is that one or more wind turbine generator are near its power limit.If wind turbine generator from its system limits value away from, to such an extent as to need not reach system limits, just can improve voltage, can improve voltage for the object that reduces electric loss and improve coefficient of efficiency so.
Therefore if transformation ratio has been changed, and the voltage of wind power station internal electric network also changed, and perhaps the control device of wind turbine generator can attempt to react on change in voltage so, and voltage is adjusted in old value again.In most of the cases, do not wish that this reaction occurs wind turbine generator.If stipulated the new theory value of voltage and/or idle component when changing transformation ratio, so just can avoid this reaction.Therefore to provide following information to wind turbine generator, that is, in the internal electric network of wind power station, wish to change, and should not carry out reaction control to it.
In being less than the scope of a shunting switch, also can be by taking active or Passively compensated measure to affect the voltage levvl of wind power station internal electric network.The example of this situation has: the electric capacity that is switched on or switched off wind power station internal electric network.More meaningfully, according to method of the present invention, can link together with the control of compensation arrangement in the following way, that is, first by the compensation of inside, wind power station, carry out less adjustment, when the larger adjustment of needs, just operate shunting switch.
Can be for implementing according to method of the present invention according to wind power station of the present invention.It arranges as follows: wind power station control device can be according to the electric loading of a wind turbine generator to shunting switch and setting transformation ratio.By setting a suitable transformation ratio adjust therefrom the voltage in the internal electric network of wind power station, so just can make the wind turbine generator of wind power station a wind turbine generator, can bear on the working point of less load and move.
A characteristic curve memory is preferably set, in described characteristic curve memory, can deposits a U-Q characteristic curve that is different from rectangle.According to U-Q characteristic curve, can determine that how high the electric loading that wind turbine generator can bear have.In addition, a logic module can also be directly set in wind turbine generator, described module can contrast being fed to the voltage U of the electric energy in the internal electric network of wind power station and idle component Q and U-Q characteristic curve.If comparing result is that the electric loading that wind turbine generator is born is higher, can transmit so a corresponding signal to wind power generation station control.In wind power generation station control, will check whether have the condition of switching shunting switch.Condition may be, surpasses one or the wind turbine generator that surpasses half and sent the higher signal of electric loading in wind power station.
As optional method or compensation process, a logic module can be installed on wind power generation station control, described logic module can contrast the voltage U of wind power station internal electric network and idle component Q and U-Q characteristic curve.It is not identical everywhere that various factors may cause the voltage of wind power station internal electric network.Lead to voltage U in the transformer station of external electrical network and the value of idle component Q and also need not equal the analog value in each wind turbine generator.But can derive the situation of relevant each wind turbine generator electric loading with the concentrated measured value of idle component Q according to voltage U in the internal electric network of wind power station, and may be prescribed as the condition that regulates transformation ratio and operate shunting switch.For example: when wind power station obtains a new reactive power set point from outside, and, according to concentrating contrast to find that wind turbine generator can not meet the requirement of new reactive power set point due to the electric loading compared with high with U-Q characteristic curve, so at this moment the switching of a shunting switch just should be set.
Shunting switch can be installed separately or structurally link together with transformer.When the working point of wind turbine generator is far from desired working point, in order to make a response fast, can shunting switch be set like this, that is, when needed, shunting switch can complete a plurality of switch grades in a switch motion.Fine setting for voltage can arrange in addition a reactive power source that is independent of wind turbine generator in the internal electric network of wind power station, and described reactive power source can be switched on and disconnect.Reactive power source also can be controlled or be regulated.Also can a plurality of combinations that formed by shunting switch and transformer in parallel, so that generation redundancy.
Can arrange, first electric energy flows to external electrical network by trunk line.When wind power station is an alongshore wind power station, and electric energy is when to be while sending coastal area to by trunk line or wind power station far from next tie point of public power supply network, just can consider this mode.Can first shunting switch be installed at the first end of trunk line, at the second end of trunk line, second shunting switch be installed, wherein two shunting switchs can be controlled or be regulated by wind power generation station control.Therefore, the voltage that the voltage in the internal electric network of wind power station can be independent of in public power supply network is selected, also can be by two shunting switchs are operated the voltage drop on whole trunk line is oppositely controlled.
Accompanying drawing explanation
Below by the situation that consulting accompanying drawing, according to favourable execution mode, present invention is described.Wherein:
Fig. 1 is a kind of wind power station of the present invention;
Fig. 2 is a U-Q characteristic curve according to wind power station of the present invention wind turbine generator;
Fig. 3,4 is according to the example working point of the characteristic wind turbine generator of U-Q described in Fig. 2;
Fig. 5 is a kind of optional U-Q characteristic curve.
Embodiment
Wind power station as described in Figure 1 comprises many wind turbine generator 10.Every wind turbine generator 10 comprises a rotor, and the rotation of described rotor can change into electric energy by a unshowned generator.The electric energy for example, with certain voltage (: 690 volts) of being produced by generator has just been loaded the middle pressure of a kind of 20 kilovolts in wind turbine generator 10.Utilize the voltage of 20 kilovolts just can be feeding electric energy in the internal electric network 11 to wind power station, and flow to transformer station 12 by wind power station internal electric network 11.A part for wind power station internal electric network 11 is to explain in the mode of equivalent electric circuit Figure 15, to illustrate that they all have the effect of inductance, electric capacity and resistance separately.In transformer station 12, matched transformer is equipped with a shunting switch 13, utilizes described shunting switch electric energy pressure from 20 kilovolts can be become to the high pressure of 110 kilovolts.
In transformer station 12, electric energy will be fed to external electrical network 14.In general, external electrical network is a kind of common feed electrical network, by described common feed electrical network, can give user power distribution.Particularly in alongshore wind power station, at the shunting switch that is positioned at the trunk line other end by another one power delivery to before external electrical network, first can power delivery, give trunk line by a shunting switch.When implementing the method for the invention, two shunting switchs can be set and can mutually complete in phase on-off action, wherein for the present invention, two kinds of shunting switchs are all considered as belonging to wind power station.Voltage in so just can separated wind power station internal electric network 11 and the voltage in common feed electrical network, and need not select the voltage in wind power station internal electric network 11 according to the voltage in common feed electrical network.Can also prevent change in voltage by operating one of two shunting switchs in addition, described change in voltage only there will be the one end at trunk line.
Wind power generation station control 20 can provide the various information of relevant wind power station state.Information comprises voltage and the reactive power value of actual voltage value in wind power station internal electric network 11 and actual current value, artificial regulation, and the information of relevant wind turbine generator 10 states, wherein electric energy should utilize described voltage to be fed to external electrical network 14 together with reactive power value.Wind power generation station control 20 is processed these information, and calculates thus the set point that need to be transferred to each element of wind power station.Therefore, shunting switch 13 can be received the set point of a relevant transformation ratio.Wind turbine generator 10 can obtain the set point of relevant voltage and reactive power.
Fig. 2 shows a kind of U-Q characteristic curve 17, and described characteristic curve shows working range, and in described working range, wind turbine generator 10 just can be by feeding electric energy to wind power station internal electric network 11.In U-Q characteristic curve 17, in the form of an axis Shang，Yi standard unit, provide voltage U, wherein there is a value to equal 1.00 rated voltages.Equally, in the form of an other axis Shang，Yi standard unit, provided idle component Q, wherein, when Q=0.0, electric current and voltage same-phase.When Q=0.0, also only can transmit effective power, idle component equals 0.Q value be on the occasion of time, can be fed to electric capacity reactive power, when Q value is negative value, can feed inductor reactive power.If wind turbine generator can provide the reactive power of formed objects in the whole permission voltage range between 0.95 to 1.06, U-Q characteristic curve 17 will form a rectangle so.But as mentioned above, when voltage is lower, the ability of feed inductor reactive power also can reduce.On the contrary, when voltage is higher, the ability that is fed to electric capacity reactive power will reduce.Therefore, compare with rectangle, can lack the lower left corner and the upper right corner, so characteristic curve is similar to rhombus.
If we record wind turbine generator 10 feeding electric energy during to wind power station internal electric network 11 with magnitude of voltage U and idle component Q, we just can be in get the bid out the working point of wind turbine generator 10 of the U-Q of Fig. 2 characteristic curve 17 so.In general, be positioned at the electric loading of working point explanation wind turbine generator 10 at U-Q characteristic curve 17 centers lower.The working point that is positioned at U-Q characteristic curve 17 edge annexes illustrates that the electric loading of wind turbine generator 10 is higher.Shown in accompanying drawing be applicable to the output of higher or normal effective power.Scope for lower effective power output, can form another limit function, and in described limit function, the characteristic working range of U-Q can become large to from left to right.
In the U-Q characteristic curve described in Fig. 3, one that has marked wind turbine generator 10 may working point 16.Voltage U equals 1.04 times of rated voltages, and it has been fed to a lot of electric capacity reactive powers, to such an extent as to working point is located immediately at the characteristic edge of U-Q.If wind turbine generator 10 provides desired reactive power at once, working point 16 will remain unchanged so.
In another situation, wind turbine generator 10 itself must provide more reactive power, could meet reactive power set point, but due to higher electric loading, so it can not be done like this.Provide reactive power component can cause a working point to be positioned at outside U-Q characteristic curve, that is to say and can cause being positioned at outside allowed scope.In this case, wind turbine generator can be sent the information that electric loading is higher to wind power station controller 20.According to method of the present invention, wind power generation station control 20 can operate 13 1 gears of shunting switch, to reduce the voltage in wind power station internal electric network 11.Working point 16 will become working point 16a.
Wind power generation station control can determine, with respect to wind turbine generator, the electric loading on working point 16 decreases the electric loading of wind turbine generator on the 16a of working point.If the electric capacity reactive power on the 16a of working point is inadequate, wind power generation station control can be adjusted to working point 24 so.On working point 24, the state of wind turbine generator and working point 16 is also different, and it can meet the requirement that improves electric capacity reactive power.Meanwhile, the electric loading on working point 24 also can be lower than the electric loading on working point 16, because working point 24 also has with a certain distance from the characteristic edge of U-Q.By method of the present invention operation shunting switch 13, the working point of movable wind power generator group first, thus reduce electric loading.Utilize a part of gap drawing thus can be fed to more electric capacity reactive power.
In the working point 18 shown in Fig. 4, voltage U equals 98% of rated voltage, and inductance reactive power will be fed in wind power station internal electric network 11.If following variation has occurred the set point of reactive power, that is, wind turbine generator 10 should be than being fed to a little less inductance reactive power before, and wind turbine generator just can meet this set point completely so.Wind power generation station control will be as shown in arrow 19, and working point 18 is moved right.So just can at any time the reactive power being fed to be reduced to axle Q=0.0.
On the contrary, if need more inductance reactive power, wind power generation station control must continue working point 18 to be moved to the left so.Can do so within the specific limits, because working point 18 also has with a certain distance from the characteristic edge of U-Q.Distance 21 between working point 18 and U-Q characteristic curve edge shows the pre-allowance of reactive power that wind turbine generator also has on working point 18.If the pre-allowance of reactive power is too low, and can not meet desired inductance reactive power set point, equipment will send corresponding signal to wind power generation station control 20 so.
In the wind power station described in Fig. 1, in every wind turbine generator 10, all store a U-Q characteristic curve 17.If wind turbine generator 10 finds that according to U-Q characteristic curve 17 electric loading increases to some extent, wind power generation station control 20 will obtain signal by data wire 22 from every wind turbine generator 10 so.Because shunting switch 13 can suffer larger wearing and tearing, therefore should avoid switch motion number of times too much, according in method of the present invention, if only have an independent wind turbine generator to find that electric loading increases, so can immediate operation shunting switch 13.Or rather, suitable standard is set to wind power generation station control 20, according to described standard, can determine, reduce the loss that wearing and tearing that whether cost that the electric loading of wind turbine generator 10 saves be greater than shunting switch 13 cause.
Wind power station described in Fig. 1 comprises 5 wind turbine generator 10.For example: only have when 3 equipment of wind power generation station control 20 from 5 wind turbine generator are received the signal of electric loading increase, just can operate shunting switch 13 No. one time.Also in the time of can selecting two equipment in wind turbine generator to occur following situation, just operate shunting switch 13, that is, they on present operating point at a distance of too far away and cannot meet the requirement of reactive power set point.Wind power generation station control 20 can be derived other standard in the following way, that is, they can contrast the actual value of the voltage in wind power station internal electric network 11 and reactive power and the U-Q characteristic curve 17 being stored in wind power generation station control 20.
If wind power generation station control 20 is obtained a result, show to operate shunting switch 13, controller sends a corresponding set point will to shunting switch 13 so.By operation shunting switch 13, can adjust the transformation ratio of voltage between external electrical network 14 and wind power station internal electric network 11.Wind power generation station control 20 command transfer to shunting switch 13 in, also can give wind turbine generator 10 transmission new voltage and/or reactive power theory value, to inform the information of desired variation in the internal electric network of the relevant wind power station of wind turbine generator.Otherwise the controller of wind turbine generator 10 will be attempted oppositely to control and change.
Figure 5 illustrates another U-Q characteristic curve, described characteristic curve can be made fractional order reaction.If in the U-Q characteristic curve interior zone 25 of working point in limiting with solid line, so just illustrate that the electric loading of wind turbine generator is lower, reduce electric loading without taking measures.If working point, in the characteristic outer peripheral areas 23 of U-Q, although the electric loading of wind turbine generator has been enhanced so, does not also reach need to react immediately so high.Allow wind turbine generator with this shorter time of working point operation.After more than ten minutes, if working point can't turn back in interior zone 25, so just start to operate shunting switch 13.On the contrary, if working point outside perimeter 23, so just represents that electric overload has occurred wind turbine generator, should immediate operation shunting switch 13.
In a kind of optional execution mode, if working point is in the characteristic interior zone 25 of U-Q, so just need not operate shunting switch 13.If working point is in the characteristic perimeter 23 of U-Q, shunting switch 13 can be by a grade of operation.When if working point is positioned at outside perimeter 23, shunting switch 13 can be by two grades of operation in a switching process.In all cases, according to method of the present invention, can reduce the electric loading of wind turbine generator.
Claims (10)
1. the operation method of a wind power station, in described method, the electric energy that wind power station produces flows to Yi Ge transformer station (12) by wind power station internal electric network (11), and in described method, electric energy is fed to external electrical network (14) before, can be converted into a kind of voltage, the high optional transformation ratio of voltage of this voltage ratio wind power station internal electric network (11), said method comprising the steps of:
A. determine the electric loading of the wind turbine generator in wind power station (10), the electric loading of described wind turbine generator refers to the load that electrical energy flows causes when each element of wind turbine generator, by the voltage U of the electric energy of producing and idle component Q and U-Q characteristic curve are contrasted, determine the electric loading of wind turbine generator (10) in wind turbine generator (10); And
B. according to the electric loading of wind turbine generator (10), regulate transformation ratio, according to U-Q characteristic curve, determine the pre-allowance of reactive power (21) of wind turbine generator (10), by adjusting transformation, recently adjust wind power station internal electric network voltage.
2. the operation method of wind power station according to claim 1, is characterized in that, while only having electric loading in the most wind turbine generator in wind power station (10) to surpass the limiting value of a regulation, just can regulate transformation ratio.
3. the operation method of wind power station according to claim 1, is characterized in that, when regulating transformation ratio, can give wind turbine generator (10) setting voltage of wind power station and/or the new theory value of idle component.
4. according to the operation method of the wind power station described in any one claim in claims 1 to 3, it is characterized in that, by connecting and disconnecting, be independent of the reactive power source of wind turbine generator (10), for voltage levvl in wind power station internal electric network (11), finely tune.
5. a wind power station, comprise transformer station (12), in described transformer station, the electric energy that wind power station is produced is fed to external electrical network (14) from the internal electric network (11) of wind power station, described wind power station also comprises a kind of shunting switch (13) and a wind power generation station control (20), described shunting switch is used for regulating the transformation ratio between wind power station internal electric network (11) voltage and external electrical network (14) voltage, described controller is for setting a transformation ratio to shunting switch, it is characterized in that, wind power generation station control (20) is set transformation ratio according to the electric loading of the wind turbine generator of wind power station (10) to shunting switch (13), set a characteristic curve, and in characteristic curve memory, deposit a U-Q characteristic curve (17), the wind turbine generator of wind power station (10) has a logic module, described logic module contrasts the voltage U by electric energy that wind turbine generator is exported and idle component Q and U-Q characteristic curve (17), determine the electric loading of wind turbine generator (10) and whether enough pre-allowances of reactive power are provided, adjust thus transformation ratio, thereby adjust wind power station internal electric network voltage.
6. wind power station according to claim 5, it is characterized in that, wind power generation station control (20) has a logic module, and described logic module contrasts the voltage U of wind power station internal electric network and idle component Q and U-Q characteristic curve (17).
7. wind power station according to claim 5, it is characterized in that, wind power generation station control (20) has an analysis module, and described analysis module determines whether to switch shunting switch (13) according to the state parameter of effective power output in real time and/or average voltage and/or shunting switch (13).
8. wind power station according to claim 5, is characterized in that, shunting switch (13) can switch a plurality of switch grades in a switch motion.
9. wind power station according to claim 5, is characterized in that, a reactive power source that is independent of wind turbine generator (10) is additionally set in the internal electric network of wind power station and be used for affecting voltage.
10. according to the wind power station described in any one claim in claim 5 to 9, it is characterized in that, electric energy flows to external electrical network (14) by trunk line, wherein at the first end of trunk line, first shunting switch is installed, the second end at trunk line is installed second shunting switch, and wherein two shunting switchs are controlled or regulated by wind power generation station control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910223822.5A CN102074969B (en) | 2009-11-23 | 2009-11-23 | Wind power plant and operation method for same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910223822.5A CN102074969B (en) | 2009-11-23 | 2009-11-23 | Wind power plant and operation method for same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102074969A CN102074969A (en) | 2011-05-25 |
| CN102074969B true CN102074969B (en) | 2014-03-12 |
Family
ID=44033368
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910223822.5A Expired - Fee Related CN102074969B (en) | 2009-11-23 | 2009-11-23 | Wind power plant and operation method for same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102074969B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102014113262B4 (en) * | 2014-09-15 | 2016-09-15 | Sma Solar Technology Ag | Method and device for operating a power plant with fluctuating capacity connected to a network generator and at least one load to a limited AC network |
| DE102017114309A1 (en) * | 2017-06-28 | 2019-01-03 | Innogy Se | WIND ENERGY SYSTEM AND METHOD FOR REGULATING A WIND POWER PLANT |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19620906C2 (en) * | 1996-05-24 | 2000-02-10 | Siemens Ag | Wind farm |
| CN1559097A (en) * | 2001-09-28 | 2004-12-29 | ���Ͱ�˹���ڱ� | Method for operating a wind park |
| CN1630157A (en) * | 2003-08-18 | 2005-06-22 | 通用电气公司 | Continuous reactive power support for wind turbine generators |
| GB2410386A (en) * | 2004-01-22 | 2005-07-27 | Areva T & D Uk Ltd | Controlling reactive power output |
| US7298059B2 (en) * | 2004-12-17 | 2007-11-20 | General Electric Company | System and method for operating a wind farm under high wind speed conditions |
| CN101461116A (en) * | 2004-12-17 | 2009-06-17 | 再生动力系统股份公司 | Power control of a wind farm and method therefor |
| CN201332278Y (en) * | 2009-01-20 | 2009-10-21 | 北京华电润泽环保有限公司 | Reactive compensation linkage control system for wind power station |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7199482B2 (en) * | 2005-06-30 | 2007-04-03 | General Electric Company | System and method for controlling effective wind farm power output |
| US7642666B2 (en) * | 2006-11-02 | 2010-01-05 | Hitachi, Ltd. | Wind power generation apparatus, wind power generation system and power system control apparatus |
-
2009
- 2009-11-23 CN CN200910223822.5A patent/CN102074969B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19620906C2 (en) * | 1996-05-24 | 2000-02-10 | Siemens Ag | Wind farm |
| CN1559097A (en) * | 2001-09-28 | 2004-12-29 | ���Ͱ�˹���ڱ� | Method for operating a wind park |
| CN1630157A (en) * | 2003-08-18 | 2005-06-22 | 通用电气公司 | Continuous reactive power support for wind turbine generators |
| GB2410386A (en) * | 2004-01-22 | 2005-07-27 | Areva T & D Uk Ltd | Controlling reactive power output |
| US7298059B2 (en) * | 2004-12-17 | 2007-11-20 | General Electric Company | System and method for operating a wind farm under high wind speed conditions |
| CN101461116A (en) * | 2004-12-17 | 2009-06-17 | 再生动力系统股份公司 | Power control of a wind farm and method therefor |
| CN201332278Y (en) * | 2009-01-20 | 2009-10-21 | 北京华电润泽环保有限公司 | Reactive compensation linkage control system for wind power station |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102074969A (en) | 2011-05-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101896718B (en) | Production system for electric energy and hydrogen | |
| CA2520916C (en) | Wind farm and method for operating same | |
| DK2333926T3 (en) | A wind farm and a method for operating a wind park | |
| CN104113074B (en) | For controlling the controller of electric power converter | |
| CN105191047B (en) | For the method by feed electric power into power supply network | |
| JP2012120428A (en) | Integration of renewable power generating technologies with integrated volt/var control systems | |
| US20110106322A1 (en) | Network connection manner of microgrid energy storage backup power source, and method for dispatching the same | |
| US20100141030A1 (en) | Method for operating a low-voltage electrical system | |
| SK287212B6 (en) | Method for operating windmill generating station system and apparatus for making the same | |
| US11025063B2 (en) | Method and apparatus for operating an electrical energy storage system | |
| CN101868766B (en) | Arrangement and method for operating a wind power plant or wind farm | |
| CN108988324A (en) | One kind being based on SOC and output power balance control method | |
| CN107005057A (en) | Method and controller for the control of coordination wind power plant during being disconnected with utility network | |
| WO2014099274A1 (en) | Voltage regulation system and method | |
| US8283803B2 (en) | Wind farm and method for operation of a wind farm | |
| CN102074969B (en) | Wind power plant and operation method for same | |
| Zadeh et al. | Design and implementation of a microgrid controller | |
| AU2022201116A1 (en) | System for producing hydrogen from renewable energy and control method thereof | |
| CN101291070A (en) | Controlling method for high-efficient outputting of photovoltaic parallel-net power generating system | |
| US20230279571A1 (en) | Electrolyzer power management and power system control | |
| CN104272546A (en) | Electric device, and method for controlling an electric energy generator | |
| US20020037443A1 (en) | Method of controlling a fuel cell system | |
| CN103296699A (en) | Fast control method of planned isolated island power supply switching power balance based on wide range information | |
| CN106662073A (en) | Method and system for coordinating control of wind farm during disconnection to utility grid | |
| Chandrashekar et al. | AGC and AVR implementation in a deregulated power system using optimized controller with Renewable integrated DC link |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: SENVION EUROPE SE Free format text: FORMER OWNER: REPOWER SYSTEM AG Effective date: 20141219 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20141219 Address after: The German city of Hamburg in Bay No. 10 Louis Patentee after: SENVION SE Address before: The German city of Hamburg in Bay No. 10 Louis Patentee before: Repower System AG |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140312 Termination date: 20201123 |