CN102400855B - Power adjusting method and device in wind farm - Google Patents
Power adjusting method and device in wind farm Download PDFInfo
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Abstract
本发明属于风力发电技术领域，具体提供了一种风电场的功率调节方法及功率调节装置。该方法包括下述步骤：1)实时采集电网对风电场的有效功率需求值，并将其作为风电场的目标输出功率Pr；2)获取风电场当前的实际输出功率P；3)根据风电场当前的实际输出功率P与目标输出功率Pr，计算所述风电场的功率调整值；4)基于所述功率调整值而确定功率调整策略；5)基于所述功率调整策略而控制所述风电场内相应风机的工作状态；重复上述步骤2)至步骤5)，直至所述风电场的输出功率满足电网的功率需求。本发明提供的上述功率调节方法及装置能够及时准确地调整风电场的输出功率，提高风机运行的稳定性和安全性，同时还可以大大节省人力成本。
The invention belongs to the technical field of wind power generation, and specifically provides a power regulation method and a power regulation device of a wind farm. The method includes the following steps: 1) collect the effective power demand value of the wind farm by the power grid in real time, and use it as the target output power Pr of the wind farm; 2) obtain the current actual output power P of the wind farm; Calculate the power adjustment value of the wind farm based on the current actual output power P and target output power Pr; 4) determine a power adjustment strategy based on the power adjustment value; 5) control the wind farm based on the power adjustment strategy The working state of the corresponding wind turbine in the wind farm; repeat the above steps 2) to 5) until the output power of the wind farm meets the power demand of the grid. The power adjustment method and device provided by the present invention can timely and accurately adjust the output power of the wind farm, improve the stability and safety of the wind turbine operation, and can greatly save labor costs at the same time.
Description
Technical field
The present invention relates to technical field of wind power generation, be specifically related to power regulating method and the Power Conditioning Unit of wind energy turbine set.
Background technique
Along with the development of wind-powered electricity generation, the wind energy turbine set with a large amount of wind power generating set is also more and more, and wind energy turbine set, as a part for power supply system, is being born the power supply task of responsive electricity grid requirement.Along with improving constantly of grid-connected output power, the stability of wind farm grid-connected operation is important all the more to the stability role of whole mains supply.Thereby in actual applications, just need to need to carry out to regulate in real time according to grid-connected power the output power of whole wind energy turbine set.Particularly, wind energy turbine set will receive the power dispatching requirement from electrical network in real time, and controls the whole generated output of wind energy turbine set based on this, to meet the requirement of electrical network.
At present, existing wind energy turbine set power adjustments mode mostly is the mode regulating manually.Particularly, first by electrical network aspect, by manually informing by telephone wind energy turbine set, carry out power adjustments; Then, wind energy turbine set operator on duty compares the requirements of electrical network with the total output value of wind energy turbine set generated output now; Then, by difference based on the comparison of electric field operator on duty and manually control fan parking, startup, lifting/lowering power by means of wind energy turbine set control device, to control the active power of wind farm grid-connected point, reach the desired value that electrical network requires.For example, when power per liter, electric field operator on duty can distribute to the unit that can improve again generated output in wind energy turbine set once by above-mentioned relatively difference.Certainly, when distributing concrete power adjustments amount, according to the state of each unit in wind energy turbine set, total performance number that needs can be promoted is averagely allocated to a plurality of units randomly once, and total performance number that also needs can be promoted is distributed to a plurality of units randomly once unequally.
Although above-mentioned wind energy turbine set power adjustments mode is widely adopted at present, inevitably there is following defect in it in actual applications:
One; because above-mentioned wind energy turbine set power adjustments mode needs a large amount of operations manually, in this case, regardless of the scale of wind energy turbine set; all need to configure the operator on duty of some, to manually control fan starting or the shutdown in wind energy turbine set according to the demand of electrical network.Thereby existing wind energy turbine set power adjustments mode need to expend a large amount of manpowers.
They are two years old; because above-mentioned wind energy turbine set power adjustments mode manually completes by operator;; operator receive after electrical network regulatory demand; by calculating, obtain the requirements of electrical network with the comparison difference between the total output value of wind energy turbine set generated output now; and manually control fan starting, shutdown, the lifting/lowering power in wind energy turbine set according to this comparison difference, thereby there is the problems such as error is large, speed of response is slow, and then cause the loss of wind energy turbine set generated energy.
Its three, above-mentioned wind energy turbine set power adjustments mode is not called and is controlled it according to the specific works situation of each blower fan in wind energy turbine set, but comparatively randomly blower fan is opened/stops operation or carries out the operation of lifting/lowering power by operator; And when distributing power adjustments amount, be disposable distribution, rather than adjust gradually this power adjustments amount according to the situation of change of blower fan output power.Therefore, above-mentioned wind energy turbine set power adjustments mode not only highly relies on the reliability of corresponding unit work, but also ignored blower fan and used tired situation (such as the situations such as temperature of fan operation time or its electric component) because operating randomly corresponding blower fan, thereby can make some unit move for a long time always, other units are never operation of long period, thereby causes unit rate of fault to promote.And blower fan opens/stop stability and the Security that itself will affect blower fan continually, also can affect the working life of blower fan simultaneously.
Summary of the invention
For solving the problems of the technologies described above, the invention provides a kind of power regulating method of wind energy turbine set, it can adjust the output power of wind energy turbine set, stability and the Security that improves fan operation timely and accurately, can also greatly save human cost simultaneously.
For solving the problems of the technologies described above, the present invention also provides a kind of Power Conditioning Unit of wind energy turbine set, and it can adjust the output power of wind energy turbine set, stability and the Security that improves fan operation equally timely and accurately, can also greatly save human cost simultaneously.
For this reason, the invention provides a kind of power regulating method of wind energy turbine set, it comprises the steps: 1) the useful horsepower requirements of Real-time Collection electrical network to described wind energy turbine set, and the target output Pr using it as wind energy turbine set; 2) obtain the current real output P of described wind energy turbine set; 3), according to the current real output P of described wind energy turbine set and target output Pr, calculate the power adjustment of described wind energy turbine set; 4) based on described power adjustment, determine power adjustment strategy; 5) based on described power adjustment strategy, control the working state of corresponding blower fan in described wind energy turbine set; Repeat above-mentioned steps 2) to step 5), until the output power of described wind energy turbine set meets the power demand of electrical network.
Wherein, described power adjustment comprises power adjustment numerical value △ P, and in described step 3), according to the current real output P of described wind energy turbine set and target output Pr, obtains described power adjustment numerical value △ P, wherein, described power is adjusted numerical value △ P=Pr-P.
Wherein, described power adjustment comprises power adjustment rate X%, and in described step 3), according to the current real output P of described wind energy turbine set and target output Pr, obtain described power adjustment numerical value △ P, then according to described wind energy turbine set current power adjustment numerical value △ P and real output P, obtain described power adjustment rate X% again, wherein, described power is adjusted numerical value △ P=Pr-P, described power adjustment rate X%=△ P/P.
Wherein, in described step 4), described power is adjusted to integer-valued absolute value | △ P| and default adjustment threshold value compare, if described power is adjusted integer-valued absolute value | △ P| is greater than default adjustment threshold value, determine the output power need to adjust described wind energy turbine set, and determine result and described power adjustment and determine that corresponding power adjusts strategy based on this; Otherwise, determine that described power adjustment strategy is not for adjusting the output power of described wind energy turbine set, and in described step 5), when described power is adjusted the output power that strategy is the described wind energy turbine set of adjustment, based on described power adjustment strategy, adjust the output power of corresponding blower fan in described wind energy turbine set; When described power adjustment strategy is while not adjusting the output power of described wind energy turbine set, the direct process ends without the output power of the described wind energy turbine set of adjustment.
Wherein, when described power adjustment strategy is power adjustment rate X% for adjusting the output power of described wind energy turbine set and described power adjustment, in described step 5), by the unified X% that adjusts of the output power of the grid-connected unit in described wind energy turbine set.
Wherein, when described power adjustment strategy is power adjustment rate X% for adjusting the output power of described wind energy turbine set and described power adjustment, in described step 5), only, by the unified X% that adjusts of the output power of limit power unit grid-connected in described wind energy turbine set, described limit power unit is that output power is greater than the unit that predetermined meritorious output power reference value P0 is less than its peak output.
Wherein, when described power adjustment strategy is positive number for adjusting the output power of described wind energy turbine set and power adjustment rate X%, before described step 5), also comprise step 45): judge in described wind energy turbine set, whether there is standby unit, if, start corresponding standby unit and make it grid-connected, then forwarding step 2 to); If not, directly forward step 5) to.
Wherein, when described power adjustment strategy is negative for adjusting the output power of described wind energy turbine set and power adjustment rate X%, before described step 5), also comprise step 46): judge whether to make compressor emergency shutdown grid-connected in described wind energy turbine set, if, make corresponding blower fan compressor emergency shutdown, then forward step 2 to); If not, directly forward step 5) to.
As another technological scheme, the present invention also provides a kind of Power Conditioning Unit of wind energy turbine set, it comprises target power acquiring unit, fan condition acquiring unit and power adjustments unit that control and processing unit and difference are electrically connected to it, wherein, described target power acquiring unit is for gathering the useful horsepower requirements of electrical network to described wind energy turbine set, and the target output Pr using it as wind energy turbine set transfers to described control and processing unit; Described fan condition acquiring unit is used for obtaining the current real output P of described wind energy turbine set, and transmits it to described control and processing unit; Described control and processing unit comprise data computation module, and described data computation module is calculated the power adjustment of described wind energy turbine set according to the current real output P of described wind energy turbine set and target output Pr; Described control and processing unit are determined power adjustment strategy based on described power adjustment, and described power adjustment strategy is transferred to described power adjustments unit; And the working state of corresponding blower fan in described wind energy turbine set is controlled in described power adjustments unit based on described power adjustment strategy.
Wherein, described power adjustment comprises power adjustment numerical value △ P or power adjustment rate X%, and wherein, described power is adjusted numerical value △ P=Pr-P, described power adjustment rate X%=△ P/P.
Wherein, described control and processing unit also comprise data comparison module, described data comparison module is for adjusting integer-valued absolute value by described power | and △ P| and default adjustment threshold value compare, if described power is adjusted integer-valued absolute value | △ P| is greater than described default adjustment threshold value, determine the output power need to adjust described wind energy turbine set, and determine result and described power adjustment and determine that corresponding power adjusts strategy based on this; Otherwise, determine that described power adjustment strategy is not for adjusting the output power of described wind energy turbine set.
Wherein, when described power adjustment strategy is power adjustment rate X% for adjusting the output power of described wind energy turbine set and described power adjustment, described power adjustments unit is according to the indication of described control and processing unit, by the unified X% that adjusts of the output power of the grid-connected unit in described wind energy turbine set.
Wherein, when described power adjustment strategy is power adjustment rate X% for adjusting the output power of described wind energy turbine set and described power adjustment, described power adjustments unit is according to the indication of described control and processing unit, by the unified X% that adjusts of the output power of limit power unit grid-connected in described wind energy turbine set, described limit power unit is that output power is greater than the unit that predetermined meritorious output power reference value P0 is less than its peak output.
Wherein, described control and processing unit also comprise unit starting control module, when described power adjustment strategy is positive number for adjusting the output power of described wind energy turbine set and described power adjustment rate X%, described unit starting control module judges in described wind energy turbine set, whether there is standby unit, if so, indicate the corresponding standby unit of described power adjustments unit starting and make it grid-connected.
Wherein, described control and processing unit also comprise compressor emergency shutdown control module; when described power adjustment strategy is negative for adjusting the output power of described wind energy turbine set and described power adjustment rate X%; described compressor emergency shutdown control module judges whether to make compressor emergency shutdown grid-connected in described wind energy turbine set; if so, indicate described power adjustments unit to make corresponding blower fan compressor emergency shutdown.
With respect to prior art, the present invention has following beneficial effect:
First, in the power regulating method of wind energy turbine set provided by the invention, because the target output Pr of wind energy turbine set obtains the useful horsepower requirements of wind energy turbine set by Real-time Collection electrical network, and the current total real output P of wind energy turbine set also based on Real-time Collection to wind energy turbine set in the real output Pn of each blower fan obtain, like this, required power adjustment and the corresponding power adjustment strategy of wind energy turbine set obtaining based on this determined in real time according to the practical operation situation of wind energy turbine set inner blower, therefore, when controlling the working state of corresponding blower fan in wind energy turbine set according to this power adjustment strategy, just can be in time and adjust exactly the output power of wind energy turbine set, thereby the output power that makes efficiently wind energy turbine set in time meets the power demand of electrical network.
Secondly, in the invention provides the power regulating method of wind energy turbine set, by repeating following process:, gather the current real output P of wind energy turbine set, calculate wind energy turbine set power adjustment, control the working state of corresponding blower fan, can automatically the real output P of wind energy turbine set be controlled gradually and reach target output Pr, or automatically make the real output P of wind energy turbine set and the target output Pr deviation between the two gradually in admissible scope, thereby make the output power of wind energy turbine set automatically meet the power demand of electrical network.Therefore, the power regulating method of wind energy turbine set provided by the invention is without carry out power adjustments by a large amount of hand labors as prior art, thereby, adopt the power regulating method of wind energy turbine set provided by the invention, both can greatly save human cost, can improve the precision to the speed of response of grid power demand and power adjustments again, and then reduce the loss of even avoiding wind energy turbine set generated energy.
Finally, in the invention provides the power regulating method of wind energy turbine set, according to the actual working state of each blower fan in wind energy turbine set, its output power is rationally controlled, rather than manually carry out at random power control, thereby, can be when improving control accuracy and speed of response, also take into account the actual service condition such as working time or its electric component temperature of each blower fan, like this, by rationally calling wind energy turbine set inner blower, can avoid blower fan to open continually/stop, and avoid occurring the problem such as long-time standby of other units of the long-time tired operation of some unit, thereby reduce the rate of fault of blower fan, improve stability and the Security of fan operation, and then the working life of prolongation blower fan.
Similarly, in the Power Conditioning Unit of wind energy turbine set provided by the invention, because it includes the target power acquiring unit of target output Pr that can Real-time Obtaining wind energy turbine set, the fan condition acquiring unit of can Real-time Obtaining wind energy turbine set current real output P, the power adjustments unit of determining in real time control and the processing unit of power adjustment and power adjustment strategy and the working state of corresponding blower fan in wind energy turbine set being carried out control in real time, therefore, this Power Conditioning Unit has following advantage equally: one, can be in time and adjust exactly the output power of wind energy turbine set, thereby the output power that makes efficiently wind energy turbine set in time meets the power demand of electrical network, they are two years old, when the output power of wind energy turbine set is regulated by means of this Power Conditioning Unit, both can greatly save human cost, can improve the precision to the speed of response of grid power demand and power adjustments again, and then reduce the loss of even avoiding wind energy turbine set generated energy, they are three years old, when the output power of wind energy turbine set is regulated by means of this Power Conditioning Unit, can to its output power, rationally control according to the actual working state of each blower fan in wind energy turbine set, thereby when improving control accuracy and speed of response, can also take into account the service condition (such as the situations such as temperature of fan operation time or its electric component) of each blower fan, thereby can avoid blower fan to open continually/stop by rational management, and avoid occurring the problem such as long-time standby of other units of the long-time tired operation of some unit, thereby reduce the rate of fault of blower fan, improve stability and the Security of fan operation, and then can extend working life of blower fan.
Accompanying drawing explanation
The schematic flow sheet of the power regulating method of the wind energy turbine set that Fig. 1 provides for first embodiment of the invention;
The schematic flow sheet of the power regulating method of the wind energy turbine set that Fig. 2 provides for second embodiment of the invention;
The schematic flow sheet of the power regulating method of the wind energy turbine set that Fig. 3 provides for third embodiment of the invention; And
Fig. 4 is the structured flowchart of a specific embodiment of the Power Conditioning Unit of wind energy turbine set provided by the invention.
Embodiment
For making those skilled in the art understand better technological scheme of the present invention, below in conjunction with accompanying drawing, the power regulating method of wind energy turbine set provided by the invention and Power Conditioning Unit are described in detail.
Refer to Fig. 1, wherein show the schematic flow sheet of the power regulating method of the wind energy turbine set that first embodiment of the invention provides.
In step 110, the useful horsepower requirements of Real-time Collection electrical network to wind energy turbine set, and the desired value using it as wind energy turbine set power adjustments, that is, and the target output Pr using it as wind energy turbine set.
In step 120, the working state of each blower fan in Real-time Collection wind energy turbine set, so-called working state comprises: whether start shooting, whether exist the active power numerical value of fault, whether grid-connected, current output etc.Then, according to the active power numerical value Pn of the grid-connected current output of each blower fan, calculate the current real output P of this wind energy turbine set (, the current total effective output of this wind energy turbine set), wherein, P=∑ Pn, n is the numbering of wind turbine unit in this wind energy turbine set, for example, P 1, P2 ... Pn represents respectively the 1st Fans, the 2nd Fans ... n Fans.
In step 130, according to the current real output P of wind energy turbine set and target output Pr, calculate the power adjustment of wind energy turbine set.Particularly, this power adjustment can comprise power adjustment numerical value Δ P and power adjustment rate X%.When power adjustment is power adjustment numerical value Δ P, in step 130, according to the current real output P of wind energy turbine set and target output Pr, obtain power adjustment numerical value Δ P, wherein, power is adjusted numerical value Δ P=Pr-P.When power adjustment is power adjustment rate X%, in step 130, according to the current real output P of wind energy turbine set and target output Pr, obtain power adjustment numerical value Δ P, then according to wind energy turbine set current power adjustment numerical value Δ P and real output P, obtain power adjustment rate X% again.Wherein, power is adjusted numerical value Δ P=Pr-P, power adjustment rate X%=Δ P/P.
In step 140, based on above-mentioned power adjustment, determine power adjustment strategy.Whether so-called power adjustment strategy can comprise needs the output power of wind energy turbine set regulate, regulate which blower fan, regulative mode and regulate numerical value, and wherein regulative mode comprises startup blower fan, shutdown, downward Modulating Power, adjusts upward power etc.For example, in actual applications, power can be adjusted to integer-valued absolute value | Δ P| and default adjustment threshold value compare, if power is adjusted integer-valued absolute value | Δ P| is greater than default adjustment threshold value, determine the output power need to adjust described wind energy turbine set, and determine result and described power adjustment and formulate the power that includes numbering, the regulative mode of the blower fan unit being conditioned and regulate the information such as numerical value and adjust strategy based on this; Otherwise, determine that power adjustment strategy is not for regulating the output power of wind energy turbine set.
In step 150, based on above-mentioned power, adjust working state tactful and corresponding blower fan in control wind energy turbine set.Particularly, when above-mentioned power is adjusted strategy and be the output power of regulating wind power field, the output power of corresponding blower fan based on above-mentioned power adjustment strategy and in regulating wind power field; When power is adjusted strategy and be the output power of uncomfortable rectification campaign electric field, the direct process ends without the output power of regulating wind power field.For example, in actual applications, when power adjustment strategy is that the output power of regulating wind power field and power adjustment are while being power adjustment rate X%, can be by the unified X% that adjusts of the output power of the grid-connected unit in wind energy turbine set, preferably, can be only by the unified X% that adjusts of the output power of limit power unit grid-connected in wind energy turbine set.
Repeat above-mentioned steps 120 to step 150, until the output power of wind energy turbine set meets the power demand of electrical network.Particularly, in order to make the real output P of wind energy turbine set can more approach desired target output Pr, after step 150, can forward again step 120 to and regain the real output P of working state and the wind energy turbine set of each blower fan in wind energy turbine set, then continue step 130 to step 150, to the real output P of wind energy turbine set being reached or more approaching target output Pr.
Certainly, in actual applications determining step can also be set between step 130 and step 140, be used for judging whether the real output P of current wind energy turbine set progressively reaches target output Pr, or the absolute value of the difference of the two | whether Δ P| is in admissible scope, if so, without again the output power in wind energy turbine set being regulated; If not, continue to adjust the output power in wind energy turbine set.Like this, by this determining step is set, start/stop blower fan unit or convert continually the output power of blower fan unit continually, thus can extend the working life of blower fan.
In addition, when the real output P of wind energy turbine set reaches target output Pr, or the absolute value of the difference of the two | Δ P| is in admissible scope time, can re-execute above-mentioned steps 110 to step 150, according to electrical network, the new useful horsepower demand of wind energy turbine set is readjusted to the output power in wind energy turbine set, and the real output P of wind energy turbine set is reached or approach its new target output Pr.
It is to be noted, in actual applications, when power adjustment strategy is positive number for adjusting the output power of wind energy turbine set and power adjustment rate X%, before step 150, can also comprise and judge the step that whether has standby unit in wind energy turbine set, and in this step, if judge in wind energy turbine set and have standby unit, start corresponding standby unit and make it grid-connected, then forward step 120 to; Otherwise, directly forward step 150 to.Preferably, in this step, if the quantity of the standby unit in wind energy turbine set is greater than 1, preferentially start the unit that standby time is long.
And, in actual applications, when power adjustment strategy is negative for adjusting the output power of wind energy turbine set and power adjustment rate X%, before step 150, can also comprise the step that judges whether to make compressor emergency shutdown grid-connected in wind energy turbine set, and in this step, if judge, need to make compressor emergency shutdown grid-connected in wind energy turbine set, make corresponding compressor emergency shutdown grid-connected in wind energy turbine set, then forward step 120 to; Otherwise, directly forward step 150 to.Preferably, in this step, if the quantity of the standby unit in wind energy turbine set is greater than 1, preferentially make previously to have shut down the compressor emergency shutdown that number of times is few.
Further it is to be noted, although in previous embodiment be, using power adjustment rate X% as power adjustment, the output power unification of blower fan to be adjusted in wind energy turbine set to be adjusted, yet in actual applications, also can directly adopt power to adjust numerical value Δ P and be used as power adjustment, and the output power unification to blower fan to be adjusted in wind energy turbine set is adjusted with this, for example, can be in the situation that each blower fan rated output power allow, above-mentioned power is adjusted to numerical value Δ P mean allocation to unit to be adjusted respectively.
Refer to Fig. 2, wherein show the schematic flow sheet of the power regulating method of the wind energy turbine set that second embodiment of the invention provides.In the present embodiment, by improving the output power of wind energy turbine set, the real output of wind energy turbine set is reached or approach target output.
Particularly, in step 210, the useful horsepower requirements of Real-time Collection electrical network to wind energy turbine set, and the desired value using it as wind energy turbine set power adjustments, that is, and using it as wind energy turbine set target output Pr.
In step 220, the working state of each blower fan in Real-time Collection wind energy turbine set, so-called working state comprises: whether start shooting, whether exist the active power numerical value of fault, whether grid-connected, current output etc.Then, according to the active power numerical value Pn of the current output of each grid-connected blower fan, calculate the current real output P of this wind energy turbine set, wherein, P=∑ Pn, n is the numbering of wind turbine unit in this wind energy turbine set.
In step 230, according to the current target output Pr of this wind energy turbine set and real output P, calculate the required power of this wind energy turbine set and adjust numerical value Δ P.Wherein, it can be the two poor of target output Pr and real output P that this power is adjusted numerical value, that is, and and Δ P=Pr-P.
In step 240, judge that power adjusts integer-valued absolute value | whether Δ P| is greater than default adjustment threshold value,, judge that power adjusts integer-valued absolute value | whether Δ P| exceeds the two the allowed band of difference of real output P and target output Pr, if, forward step 260 to, that is, now power is adjusted strategy for adjusting the output power of this wind energy turbine set; If not, forward directly method ends of step 250 to, and without the output power of adjusting wind energy turbine set, that is, now power adjustment strategy is the output power of uncomfortable rectification campaign electric field.Wherein, default adjustment threshold value can require to preset according to actual conditions or electrical network, for example, can preset this adjustment threshold value according to previous experience value.
In step 260, judged whether standby unit, if so, forward step 270 to; If not, forward step 280 to.
In step 270, start corresponding standby unit and make it grid-connected, then forward step 220 to, to regain the real output P of working state and the wind energy turbine set of each blower fan in current wind energy turbine set.In actual applications, if the quantity of the standby unit in this wind energy turbine set is greater than 1, preferentially start the unit that standby time is long, to avoid some unit to occur the problem of equipment operation function degeneration because of long-time standby.
In step 280, according to above-mentioned power adjustment numerical value Δ P and real output P, obtain power adjustment rate X%, wherein, X%=Δ P/P.
In step 290, the output power unification of the grid-connected unit in wind energy turbine set is adjusted upward to X%.In actual applications, in order fast and effeciently to promote the output power of wind energy turbine set, can only the output power unification of the grid-connected limit power unit in this wind energy turbine set be adjusted upward to X%.
After step 290, the flow process of this method can come back to step 220 again, and interval certain hour, for example 10 seconds, regain the working state of each blower fan and the real output P of wind energy turbine set in current wind energy turbine set, then continue step 230 to step 290, until make the real output P of wind energy turbine set reach target output Pr, or make the real output P of wind energy turbine set and the target output Pr deviation between the two in admissible scope.So circulation is until meet the power demand of electrical network.
It is to be noted, although in the present embodiment, preferentially while having available standby unit in wind energy turbine set start standby unit, and when only after available standby unit all starts, the output power of electrical network still fails to reach electrical network demand, then call limit power unit; Yet be not limited in actual applications this, but also can adopt in such a way,, first adjust the output power of current grid-connected unit in wind energy turbine set, and when only the output power adjusted of current grid-connected unit is to its maximum output in wind energy turbine set, just start the available standby unit in this wind energy turbine set.
Further it is pointed out that in actual applications, after execution of step 270, this method flow process also can directly forward step 290 to, and directly by now just grid-connected unit in company with previous grid-connected unit, together raise X%.
Refer to Fig. 3, wherein show the schematic flow sheet of the power regulating method of the wind energy turbine set that third embodiment of the invention provides.In the present embodiment, by reducing the output power of wind energy turbine set, the real output of wind energy turbine set is reached or approach target output.
Particularly, in step 310, the useful horsepower requirements of Real-time Collection electrical network to wind energy turbine set, and the target output Pr using it as wind energy turbine set.
In step 320, the working state of each blower fan in Real-time Collection wind energy turbine set, so-called working state comprises: whether start shooting, whether exist the active power numerical value of fault, whether grid-connected, current output etc.Then, according to the active power numerical value Pn of the grid-connected current output of each blower fan, calculate the current real output P of this wind energy turbine set, wherein, P=∑ Pn, n is the numbering of wind turbine unit in this wind energy turbine set.
In step 330, according to the current target output Pr of this wind energy turbine set and real output P, calculate the required power of this wind energy turbine set and adjust numerical value Δ P.Wherein, it can be the two poor of target output Pr and real output P that this power is adjusted numerical value, that is, and and Δ P=Pr-P.
In step 340, judge that power adjusts integer-valued absolute value | whether Δ P| is greater than default adjustment threshold value,, judge that power adjusts integer-valued absolute value | whether Δ P| exceeds the allowed band of real output P and target output Pr deviation between the two, if, forward step 360 to, that is, now power is adjusted strategy for adjusting the output power of this wind energy turbine set; If not, forward directly method ends of step 350 to, and without the output power of adjusting wind energy turbine set, that is, now power adjustment strategy is the output power of uncomfortable rectification campaign electric field.
In step 360, judge whether to make grid-connected compressor emergency shutdown, if so, forward step 390 to; If not, forward step 370 to.
In step 370, according to above-mentioned power adjustment numerical value Δ P and real output P, obtain power adjustment rate X%, wherein, X%=Δ P/P.
In step 380, by the unified adjustment downwards of the output power of the grid-connected unit in wind energy turbine set | X%|.
In step 390, make the grid-connected corresponding compressor emergency shutdown in wind energy turbine set.In actual applications, preferentially make to shut down the compressor emergency shutdown that number of times is few.
After execution of step 380 or step 390, the flow process of this method can come back to step 320 again, to regain the real output P of working state and the wind energy turbine set of each blower fan in current wind energy turbine set, then continue step 330 to step 390, until make the real output P of wind energy turbine set reach target output Pr, or make in the scope of the real output P of wind energy turbine set and the target output Pr deviation between the two in allowing.And, when the real output P of wind energy turbine set reaches after target output Pr, or after in the scope of the deviation between the two in allowing, the flow process of this method can forward step 310 to, and the useful horsepower requirements of the current electrical network of Resurvey to wind energy turbine set, then re-execute step 320 to step 390, so that the real output of wind energy turbine set meets the power demand of current electrical network.
As another technological scheme, the present invention also provides a kind of Power Conditioning Unit of wind energy turbine set, and it comprises target power acquiring unit, fan condition acquiring unit and power adjustments unit that control and processing unit and difference are electrically connected to it.Wherein, target power acquiring unit is used for obtaining the target output Pr of wind energy turbine set, and transmits it to control and processing unit; Fan condition acquiring unit is used for obtaining the current total effective output value P of wind energy turbine set, and transmits it to control and processing unit; Control and processing unit are used for according to the power adjustment of the current total effective output value P of wind energy turbine set and target output Pr calculating wind energy turbine set, and based on this power adjustment, determine power adjustment strategy, then power adjustment strategy is transferred to power adjustments unit; The output power of corresponding blower fan in this wind energy turbine set is controlled in power adjustments unit based on this power adjustment strategy.
Refer to Fig. 4, wherein show the Power Conditioning Unit that specific embodiment of the present invention provides.This Power Conditioning Unit comprises target power acquiring unit 410, fan condition acquiring unit 420 and the power adjustments unit 440 that control and processing unit 430 and difference are electrically connected to it.
Wherein, target power acquiring unit 410 is for gathering the useful horsepower requirements of electrical network to wind energy turbine set, and the target output Pr using it as wind energy turbine set transfers to control and processing unit 430.
Fan condition acquiring unit 420 is for the working state of each blower fan in Real-time Collection wind energy turbine set, and transmits it to and control and processing unit 430.So-called working state comprises: whether start shooting, whether exist the active power numerical value of fault, whether grid-connected, current output etc.Then, this fan condition acquiring unit 420 is according to the active power numerical value Pn of the current output of each grid-connected blower fan, calculate current total effective output value in this wind energy turbine set, that is, and the real output P that this wind energy turbine set is current, wherein, P=∑ Pn, n is the numbering of each unit in this wind energy turbine set, for example, P1, P2 ... Pn represents respectively the 1st Fans, the 2nd Fans ... n Fans.
Control and processing unit 430 comprise data computation module, this data computation module is according to the current real output P of wind energy turbine set and target output Pr, calculate the power adjustment of wind energy turbine set, and based on this power adjustment, determine corresponding power adjustment strategy, then just corresponding power adjustment strategy transfers to power adjustments unit 440.So-called power adjustment can comprise power adjustment numerical value Δ P or power adjustment rate X%, and wherein, power is adjusted numerical value Δ P=Pr-P, power adjustment rate X%=Δ P/P.Whether so-called power adjustment strategy comprises needs the output power of wind energy turbine set regulate, regulate which blower fan, regulative mode and regulate numerical value, and wherein regulative mode comprises startup blower fan, shutdown, downward Modulating Power, adjusts upward power etc.
The output power of corresponding blower fan in this wind energy turbine set is controlled in power adjustments unit 440 based on above-mentioned power adjustment strategy.When power adjustment strategy is power adjustment rate X% for adjusting the output power of wind energy turbine set and power adjustment, this power adjustments unit 440 is according to the indication of control and processing unit 430, by the unified X% that adjusts of the output power of the grid-connected unit in this wind energy turbine set.Particularly, when X% is positive number, the output power unification of the grid-connected unit in wind energy turbine set is adjusted upward to X%; When X% is negative, by the unified adjustment downwards of the output power of the grid-connected unit in wind energy turbine set | X%|.And, in actual applications, when power adjustment strategy is power adjustment rate X% for adjusting the output power of wind energy turbine set and power adjustment, in order fast and effeciently to promote the output power of wind energy turbine set, power adjustments unit 440, according to the indication of control and processing unit 430, can only adjust upward X% by the output power unification of limit power unit grid-connected in this wind energy turbine set.
In addition,, in order to control more efficiently the output power of wind energy turbine set, this control and processing unit 430 can also comprise data comparison module, unit starting control module and compressor emergency shutdown control module.
Wherein, data comparison module is adjusted integer-valued absolute value by power | and Δ P| and default adjustment threshold value compare, if power is adjusted integer-valued absolute value | Δ P| is greater than default adjustment threshold value, determine the output power need to adjust wind energy turbine set, and determine result and power adjustment and determine that corresponding power adjusts strategy based on this; Otherwise, determine that it is the output power of uncomfortable rectification campaign electric field that power is adjusted tactful.Like this, work compound by means of this data comparison module, control and processing unit 430 and power adjustments unit 440, can only at power, adjust integer-valued absolute value | when being greater than default adjustment threshold value, Δ P| just carries out power adjustments, and without start/stop blower fan unit continually or convert continually the output power of blower fan unit, thereby can extend the working life of blower fan.
Unit starting control module for judging in this wind energy turbine set whether have standby unit when X% is positive number, and if so, indicated power regulon 440 work, that is, start corresponding standby unit and make it grid-connected.While there is many standby units in unit starting control module is judged this wind energy turbine set, indicated power regulon 440 is preferential starts the unit that standby time is long, thereby can avoid some unit to occur the problem of equipment operation function degeneration because of standby always.
Compressor emergency shutdown control module is for judging whether to make compressor emergency shutdown grid-connected in wind energy turbine set when X% is negative, and if so, indicated power regulon 440 is worked, that is, and and by corresponding compressor emergency shutdown.The quantity of the grid-connected unit in compressor emergency shutdown control module is judged this wind energy turbine set is greater than 1; indicated power regulon 440 preferentially makes previously to have shut down the compressor emergency shutdown that number of times is few, thereby can avoid some unit because causing the tired and final problem that affects working life of equipment in running state for a long time.
It is to be noted, in aforementioned each embodiment, so-called limit power unit refers in grid-connected unit and can by set pitch control, improve the unit of its output power, namely refers to that output power is greater than predetermined meritorious output power reference value P0 and is less than the unit of its peak output.Wherein, the concrete value of this meritorious output power reference value P0 is determined by rated power and the residing wind-resources environment of unit of unit.For example, for golden wind 1.5MW unit, can rule of thumb preset this meritorious output power reference value P0 is 500kW, now, for this model unit, its meritorious output power is greater than 500kW and the unit that is less than its peak output defines the power unit that is limited.Be appreciated that, now wind energy turbine set may can exist the odjective causes such as wind-resources because of present position to cause meritorious output power to be less than the unit of 500kW equally,, this wind energy turbine set may exist the unit that can not improve its output power by set pitch control, therefore in order fast and effeciently to adjust the output power of wind energy turbine set, can only adjust the unit of limit power grid-connected in this wind energy turbine set.
The illustrative embodiments that further it is pointed out that above mode of execution to be only used to principle of the present invention is described and adopt, however the present invention is not limited thereto.For those skilled in the art, without departing from the spirit and substance in the present invention, can make various modification and improvement, these modification and improvement are also considered as protection scope of the present invention.
Claims (15)
1. a power regulating method for wind energy turbine set, is characterized in that comprising the steps:
1) the useful horsepower requirements of Real-time Collection electrical network to described wind energy turbine set, and the target output Pr using it as wind energy turbine set;
2) obtain the current real output P of described wind energy turbine set;
3), according to the current real output P of described wind energy turbine set and target output Pr, calculate the power adjustment of described wind energy turbine set;
4) based on described power adjustment, determine power adjustment strategy;
5) based on described power adjustment strategy, control the working state of corresponding blower fan in described wind energy turbine set;
Repeat above-mentioned steps 2) to step 5), until the output power of described wind energy turbine set meets the power demand of electrical network.
2. the power regulating method of wind energy turbine set according to claim 1, it is characterized in that, described power adjustment comprises power adjustment numerical value △ P, and in described step 3), according to the current real output P of described wind energy turbine set and target output Pr, obtain described power adjustment numerical value △ P, wherein, described power is adjusted numerical value △ P=Pr-P.
3. the power regulating method of wind energy turbine set according to claim 1, it is characterized in that, described power adjustment comprises power adjustment rate X%, and in described step 3), according to the current real output P of described wind energy turbine set and target output Pr, obtain power adjustment numerical value △ P, then according to described wind energy turbine set current power adjustment numerical value △ P and real output P, obtain described power adjustment rate X% again, wherein, described power is adjusted numerical value △ P=Pr-P, described power adjustment rate X%=△ P/P.
4. according to the power regulating method of the wind energy turbine set described in claim 2 or 3, it is characterized in that, in described step 4), described power is adjusted to integer-valued absolute value | △ P| and default adjustment threshold value compare, if described power is adjusted integer-valued absolute value | △ P| is greater than default adjustment threshold value, determine the output power need to adjust described wind energy turbine set, and determine result and described power adjustment and determine that corresponding power adjusts strategy based on this; Otherwise, determine that described power adjustment strategy is for not adjusting the output power of described wind energy turbine set, and
In described step 5), when described power is adjusted the output power that strategy is the described wind energy turbine set of adjustment, based on described power adjustment strategy, adjust the output power of corresponding blower fan in described wind energy turbine set; When described power adjustment strategy is while not adjusting the output power of described wind energy turbine set, the direct process ends without the output power of the described wind energy turbine set of adjustment.
5. the power regulating method of wind energy turbine set according to claim 4, it is characterized in that, when described power adjustment strategy is power adjustment rate X% for adjusting the output power of described wind energy turbine set and described power adjustment, in described step 5), by the unified X% that adjusts of the output power of the grid-connected unit in described wind energy turbine set.
6. the power regulating method of wind energy turbine set according to claim 5, it is characterized in that, when described power adjustment strategy is power adjustment rate X% for adjusting the output power of described wind energy turbine set and described power adjustment, in described step 5), only by the unified X% that adjusts of the output power of limit power unit grid-connected in described wind energy turbine set;
Described limit power unit is that output power is greater than the unit that predetermined meritorious output power reference value P0 is less than its peak output.
7. the power regulating method of wind energy turbine set according to claim 4, it is characterized in that, when described power adjustment strategy is positive number for adjusting the output power of described wind energy turbine set and power adjustment rate X%, before described step 5), also comprise step 45): judge in described wind energy turbine set, whether there is standby unit, if, start corresponding standby unit and make it grid-connected, then forwarding step 2 to); If not, directly forward step 5) to.
8. the power regulating method of wind energy turbine set according to claim 4, it is characterized in that, when described power adjustment strategy is negative for adjusting the output power of described wind energy turbine set and power adjustment rate X%, before described step 5), also comprise step 46): judge whether to make compressor emergency shutdown grid-connected in described wind energy turbine set, if, make corresponding blower fan compressor emergency shutdown, then forward step 2 to); If not, directly forward step 5) to.
9. a Power Conditioning Unit for wind energy turbine set, is characterized in that comprising: control and processing unit and difference be target power acquiring unit, fan condition acquiring unit and the power adjustments unit of electrical connection with it, wherein
Described target power acquiring unit is for gathering the useful horsepower requirements of electrical network to described wind energy turbine set, and the target output Pr using it as wind energy turbine set transfers to described control and processing unit;
Described fan condition acquiring unit is used for obtaining the current real output P of described wind energy turbine set, and transmits it to described control and processing unit;
Described control and processing unit comprise data computation module, and described data computation module is calculated the power adjustment of described wind energy turbine set according to the current real output P of described wind energy turbine set and target output Pr; Described control and processing unit are determined power adjustment strategy based on described power adjustment, and described power adjustment strategy is transferred to described power adjustments unit;
The working state of corresponding blower fan in described wind energy turbine set is controlled in described power adjustments unit based on described power adjustment strategy.
10. the Power Conditioning Unit of wind energy turbine set according to claim 9, it is characterized in that, described power adjustment comprises power adjustment numerical value △ P or power adjustment rate X%, wherein, described power is adjusted numerical value △ P=Pr-P, described power adjustment rate X%=△ P/P.
The Power Conditioning Unit of 11. wind energy turbine set according to claim 10, it is characterized in that, described control and processing unit also comprise data comparison module, described data comparison module is for adjusting integer-valued absolute value by described power | and △ P| and default adjustment threshold value compare, if described power is adjusted integer-valued absolute value | △ P| is greater than described default adjustment threshold value, determine the output power need to adjust described wind energy turbine set, and determine result and described power adjustment and determine that corresponding power adjusts strategy based on this; Otherwise, determine that described power adjustment strategy is not for adjusting the output power of described wind energy turbine set.
The Power Conditioning Unit of 12. wind energy turbine set according to claim 10, it is characterized in that, when described power adjustment strategy is power adjustment rate X% for adjusting the output power of described wind energy turbine set and described power adjustment, described power adjustments unit is according to the indication of described control and processing unit, by the unified X% that adjusts of the output power of the grid-connected unit in described wind energy turbine set.
The Power Conditioning Unit of 13. wind energy turbine set according to claim 12, it is characterized in that, when described power adjustment strategy is power adjustment rate X% for adjusting the output power of described wind energy turbine set and described power adjustment, described power adjustments unit is according to the indication of described control and processing unit, by the unified X% that adjusts of the output power of limit power unit grid-connected in described wind energy turbine set;
Described limit power unit is that output power is greater than the unit that predetermined meritorious output power reference value P0 is less than its peak output.
The Power Conditioning Unit of 14. wind energy turbine set according to claim 10, it is characterized in that, described control and processing unit also comprise unit starting control module, when described power adjustment strategy is positive number for adjusting the output power of described wind energy turbine set and described power adjustment rate X%, described unit starting control module judges in described wind energy turbine set, whether there is standby unit, if so, indicate the corresponding standby unit of described power adjustments unit starting and make it grid-connected.
The Power Conditioning Unit of 15. wind energy turbine set according to claim 10; it is characterized in that; described control and processing unit also comprise compressor emergency shutdown control module; when described power adjustment strategy is negative for adjusting the output power of described wind energy turbine set and described power adjustment rate X%; described compressor emergency shutdown control module judges whether to make compressor emergency shutdown grid-connected in described wind energy turbine set; if so, indicate described power adjustments unit to make corresponding blower fan compressor emergency shutdown.
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