CN106762408A - A kind of stall control method of fixed pitch wind-driven generator - Google Patents
A kind of stall control method of fixed pitch wind-driven generator Download PDFInfo
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- CN106762408A CN106762408A CN201610885505.XA CN201610885505A CN106762408A CN 106762408 A CN106762408 A CN 106762408A CN 201610885505 A CN201610885505 A CN 201610885505A CN 106762408 A CN106762408 A CN 106762408A
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 16
- 230000005611 electricity Effects 0.000 claims description 3
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- 238000010438 heat treatment Methods 0.000 description 2
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D7/00—Controlling wind motors
- F03D7/02—Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor
- F03D7/0256—Stall control
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- 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
- Y02E10/72—Wind turbines with rotation axis in wind direction
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- Life Sciences & Earth Sciences (AREA)
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- Sustainable Energy (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
The invention provides a kind of stall control method of fixed pitch wind-driven generator, limit rotating speed operation phase and limit Power operation stage intervention of the stall control method in fixed pitch wind-driven generator.The control method that the present invention is provided can adapt to the different loading demands such as grid-connected and off-network and exist, need not be sampled air speed data, the control method can be substantially reduced the capacity of the supporting unloading device of fixed pitch wind power generating set, boost control circuit need not be increased in electric loop simultaneously, and have the advantages that the loss of rated wind speed above wind energy conversion system power output is smaller.Different tip speed ratios and power coefficient can be dynamically adjusted in control process, the reliability of generator system is significantly improved.
Description
Technical field
The present invention relates to the stall control method of fixed pitch wind-driven generator, belong to the control method technology of wind-driven generator
Field.
Background technology
Current small-sized wind power generator unit power is relatively costly, mostly fixed pitch design, and does not have wind-speed sample device,
Control mode is simpler, and wind-driven generator easily exceeds the speed limit during strong wind, and wind power generating set spoilage is high.
The control system of relatively common wind-driven generator is as shown in figure 1, including wind-driven generator, control unit, drain charge
Device, voltage conversion device.The wind wheel capture wind energy of wind-driven generator, the blade of rotation drives generator output electric energy, to hand over
Flow the form output of electricity.Control unit comprises at least AC/DC and changes and wind-driven generator stall control algolithm function.Unloading device
To consume the energy of wind-driven generator, auxiliary applies the electromagnetic torque device of generator.Voltage conversion device should for DC/DC off-networks
With equipment or the grid-connected application apparatus of DC/AC, can be according to the speed power curve, voltage-power curve that set or real-time mould
Intend, digital communication signal is dynamically adjusted power output.
Whether part is only to be reached according to the torque of generator in having the equipment of stall control function its control method
This variable of torque capacity decides whether to reduce rotating speed, and have ignored the heating power that unloading device is born, its shortcoming
It is that unloading device capacity configuration is larger, heating is serious, many times load demand power is much smaller than wind especially in off-network application
The rated power of power generator, most of energy ezpenditure had both increased the machinery damage of wind-driven generator on unloading device, so
Consumption, and have requirement very high to unloading device long term overloading ability, therefore in the operation of pitch Wind turbine is actually determined often
Appearance causes the similar accidents such as the driving of whole unit, blade broken generation due to the mistake cause thermal damage of unloading device, its solution
Certainly method can only be the capacity for further increasing unloading device, and cost is significantly increased.
In known wind power generating set, its protected mode is mainly carries out pressure limiting drain charge, pressure limiting by unloading device
Point is the value more slightly higher than the rated output voltage of wind-driven generator, and its drain charge electrical voltage point keeps constant in stall control, therefore very
Hardly possible is applied to peak torque under different rotating speeds to generator, in order to be applied to most to generator in control process
High pulling torque, is mostly to increase boost control circuit in generator output end to realize, undoubtedly increased equipment cost.
Other part has by the wind power generating set of dynamics stall, although can earlier enter stall region, but mostly
There is a problem of that power output loss is larger.
The content of the invention
It is an object of the invention to provide a kind of capacity for reducing unloading device, the stall of wind energy conversion system power output loss is reduced
Control method.
In order to achieve the above object, the technical scheme is that there is provided a kind of stall control of fixed pitch wind-driven generator
Method processed, limit rotating speed operation phase and limit Power operation stage intervention of the stall control method in fixed pitch wind-driven generator,
It is characterised in that it includes following steps：
Step 1, the torque capacity of given fixed pitch wind-driven generator, maximum drain charge power, maximum (top) speed, minimum speed；
Step 2, the current output voltage of Real-time Collection fixed pitch wind-driven generator, current output current, current rotating speed, and
Calculate current drain charge power and current torque；
Step 3, whether current torque is judged more than torque capacity, if so, enter step 6 after then reducing rotating speed of target, if
It is no, then into step 4；
Step 4, whether current drain charge power is judged more than maximum drain charge power, if so, entering after then reducing rotating speed of target
Step 6, if it is not, then entering step 5；
Step 5, whether current drain charge power is judged more than zero, if so, then maintain to enter step 6 after rotating speed of target is constant,
If it is not, then entering step 6 after increase rotating speed of target；
Step 6, whether rotating speed of target is judged more than maximum (top) speed, if so, new rotating speed of target then is defined as into maximum turning
Enter step 8 after speed, if it is not, then entering step 7；
Step 7, whether maximum (top) speed is judged less than minimum speed, if so, new rotating speed of target then is defined as into minimum turning
Speed, if it is not, entering step 8 after new rotating speed of target then is defined as into current rotating speed of target；
Step 8, determine voltage conversion device according to real-time speed power curve track export, when enter limit Power operation
Stage, into step 9；
Step 9, whether current rotating speed is judged more than new rotating speed of target, if so, entering step after then reducing drain charge electrical voltage point
Rapid 11, if it is not, then entering step 10；
Step 10, whether current rotating speed is judged less than new rotating speed of target, if so, entering step after then improving drain charge electrical voltage point
Rapid 11, if it is not, then keeping entering step 11 after drain charge electrical voltage point is constant；
Step 11, whether drain charge electrical voltage point drain charge electrical voltage point corresponding more than maximum drain charge power is judged, if so, will then let out
Charged pressure point is set to the corresponding drain charge electrical voltage point of maximum drain charge power, into step 13, if it is not, into step 12；
Step 12, judge drain charge electrical voltage point whether less than current fixed pitch wind-driven generator rotating speed Maximum Power Output when pair
The electrical voltage point answered, if so, when drain charge electrical voltage point then being set into current fixed pitch wind-driven generator rotating speed Maximum Power Output pair
The electrical voltage point answered, into step 13, if it is not, then keeping drain charge electrical voltage point to enter step 13：
Step 13, foundation drain charge electrical voltage point carry out drain charge, while return to step 9, with real-time adjustment drain charge electrical voltage point.
The control method that the present invention is provided can adapt to the different loading demands such as grid-connected and off-network and exist, without wind speed of sampling
Data, the control method can be substantially reduced the capacity of the supporting unloading device of fixed pitch wind power generating set, while electric loop
In need not increase boost control circuit, and have the advantages that the rated wind speed above wind energy conversion system power output loss it is smaller.In control
During can dynamically adjust different tip speed ratios and power coefficient, significantly improve the reliability of generator system.
Brief description of the drawings
Fig. 1 is the control system schematic diagram of wind-driven generator；
Fig. 2 a be typical case determine pitch wind-driven generator with wind speed be refer to rotating speed and torque characteristic figure；
Fig. 2 b be typical case determine pitch wind-driven generator with wind speed be refer to best power curve；
Fig. 3 is flow chart of the invention；
Fig. 4 is voltage-power curve and voltage conversion device output power deviation curve under magneto different rotating speeds
Figure.
Specific embodiment
To become apparent the present invention, hereby with preferred embodiment, and accompanying drawing is coordinated to be described in detail below.
As shown in Fig. 2 a and Fig. 2 b, be typical case determine pitch wind-driven generator with wind speed be refer to rotating speed and torque characteristics
Figure, and best power curve (abscissa is wind speed round, and ordinate is generator torque).
Wind-driven generator operates in the different stages under different wind speed and different loads：
1) best power tracking phase：At low wind speeds, wind-driven generator operation curve BCD (BD ') section in fig. 2 a,
BC sections is according to the power curve power output given tacit consent to.CD (be incorporated into the power networks or off-grid operation load it is larger when C and D D ' put weight
Close, as shown in Figure 2 b) section is voltage conversion device maximum demanded power less than the rated output power of generator, at CD sections with the wind
The increase generator speed of speed is steeply risen to the maximum (top) speed point Nmax of setting.
2) the rotating speed operation phase is limited：Beyond rated wind speed, unloading device consumption power is smaller, and DE sections in Fig. 2 a, 2b is
The permanent rotating speed operation phase, by dynamic adjustment drain charge electrical voltage point, stabilization wind speed round is in the maximum (top) speed point Nmax operations for setting.
The stage, tip speed ratio λ and power coefficient Cp was slightly reduced, and the steady state power of unloading device is in 0~DE segment limits.
3) the Power operation stage is limited：Beyond rated wind speed, if unloading device consumption power (not up to wind after setting value
During power machine torque capacity), EFD limit power phases are entered as shown in Fig. 2 a, 2b.Such as Fig. 2 a, if wind speed is 10m/S constant (as schemed
2b, if wind speed is that 13m/S is constant), wind speed round is adjusted during to N1, generated output power only meets loading demand work(
Rate, drain charge power will be reduced to 0.The stage dynamically adjusts the rotating speed of target of generator between N1 and Nmax, once it is determined that target
Rotating speed stablizes wind speed round in rotating speed of target point by reconciling the method for drain charge electrical voltage point again.Stage tip speed ratio λ and wind
Can usage factor Cp will further offset from optimum value, but unloading device steady state power still in 0~DE segment limits.
In best power tracking phase, stall control is stayed out of, and only needs DC/DC (DC/AC) voltage conversion devices according to silent
The power curve power output recognized；To be intervened wherein in limit rotating speed and the stall control of limit Power operation stage, but limit rotating speed
Operation phase rotating speed of target is given maximum, and the stage only controls wind speed round in setting by adjusting drain charge electrical voltage point
Maximum；First it is the adjustment that rotating speed of target is carried out according to drain charge power and torque in the limit Power operation stage, power is bent
The skew of line, then makes wind speed round stabilization in rotating speed of target point by adjusting drain charge electrical voltage point.Specific control flow is such as
Shown in Fig. 3, comprise the following steps：
Step 1, the torque capacity of given fixed pitch wind-driven generator, maximum drain charge power, maximum (top) speed, minimum speed；
Step 2, the current output voltage of Real-time Collection fixed pitch wind-driven generator, current output current, current rotating speed, and
Calculate current drain charge power and current torque；
Step 3, whether current torque is judged more than torque capacity, if so, enter step 6 after then reducing rotating speed of target, if
It is no, then into step 4；
Step 4, whether current drain charge power is judged more than maximum drain charge power, if so, entering after then reducing rotating speed of target
Step 6, if it is not, then entering step 5；
Step 5, whether current drain charge power is judged more than zero, if so, then maintain to enter step 6 after rotating speed of target is constant,
If it is not, then entering step 6 after increase rotating speed of target；
Step 6, whether rotating speed of target is judged more than maximum (top) speed, if so, new rotating speed of target then is defined as into maximum turning
Enter step 8 after speed, if it is not, then entering step 7；
Step 7, whether maximum (top) speed is judged less than minimum speed, if so, new rotating speed of target then is defined as into minimum turning
Speed, if it is not, entering step 8 after new rotating speed of target then is defined as into current rotating speed of target；
Step 8, determine voltage conversion device according to real-time speed power curve track export, when enter limit Power operation
Stage, into step 9；
Step 9, whether current rotating speed is judged more than new rotating speed of target, if so, entering step after then reducing drain charge electrical voltage point
Rapid 11, if it is not, then entering step 10；
Step 10, whether current rotating speed is judged less than new rotating speed of target, if so, entering step after then improving drain charge electrical voltage point
Rapid 11, if it is not, then keeping entering step 11 after drain charge electrical voltage point is constant；
Step 11, whether drain charge electrical voltage point drain charge electrical voltage point corresponding more than maximum drain charge power is judged, if so, will then let out
Charged pressure point is set to the corresponding drain charge electrical voltage point of maximum drain charge power, into step 13, if it is not, into step 12；
Step 12, judge drain charge electrical voltage point whether less than current fixed pitch wind-driven generator rotating speed Maximum Power Output when pair
The electrical voltage point answered, if so, when drain charge electrical voltage point then being set into current fixed pitch wind-driven generator rotating speed Maximum Power Output pair
The electrical voltage point answered, into step 13, if it is not, then keeping drain charge electrical voltage point to enter step 13；
Step 13, foundation drain charge electrical voltage point carry out drain charge, while return to step 9, with real-time adjustment drain charge electrical voltage point.
Innovative point of the invention is：
Whether the 1st, adjustment of rotating speed of target is not exclusively more than given torque capacity with reference to the current torque of wind-driven generator,
And whether the size of current drain charge power is with reference to more than given maximum drain charge power.As shown in Fig. 2 a, 2b, DE sections is to let out
The power that lotus device is born, when wind speed further increases, drain charge power exceeds DE sections of critical point, although generator torque is small
In given torque capacity H-I-J lines, still rotating speed of target can be adjusted, direction be N1 to Nmax between, target is to make
Stable state drain charge power is met more than 0, less than the maximum drain charge performance number of setting.
2nd, the implementation means of constant speed control are to carry out real-time adjustment to drain charge electrical voltage point, solve conventional constant voltage point
Drain charge mode cannot effectively apply the problem of torque capacity to wind-driven generator under different rotating speeds.If as shown in figure 4, current
Rotating speed of target is N1, and its drain charge electrical voltage point will enter Mobile state adjustment between Umax and U1, and Umax is the highest drain charge electricity of setting
Pressure point, the electrical voltage point that U1 is wind-driven generator to be applied corresponding to maximum reverse moment of torsion when rotating speed is N1 to it.
3rd, in order to ensure the power demand of the voltage conversion device in stall control, kept away by the way of power curve skew
Exempt from the loss of the power output of voltage conversion device.It is assumed that the demand power of current voltage conversion equipment is Pdc-
Dc, if current rotating speed is N1, rotating speed of target is below N2, then the power curve AB lines of voltage conversion device are changed into ab lines；
If current rotating speed is N1, rotating speed of target is a certain value such as N3 between N1 to N2, then by the power curve AB of voltage conversion device
Change is turned to A ' B ' lines by line.
Claims (1)
1. a kind of stall control method of fixed pitch wind-driven generator, limit of the stall control method in fixed pitch wind-driven generator
Rotating speed operation phase and the intervention of limit Power operation stage, it is characterised in that comprise the following steps：
Step 1, the torque capacity of given fixed pitch wind-driven generator, maximum drain charge power, maximum (top) speed, minimum speed；
Step 2, the current output voltage of Real-time Collection fixed pitch wind-driven generator, current output current, current rotating speed, and calculate
Current drain charge power and current torque；
Step 3, whether current torque is judged more than torque capacity, if so, enter step 6 after then reducing rotating speed of target, if it is not, then
Into step 4；
Step 4, whether current drain charge power is judged more than maximum drain charge power, if so, entering step after then reducing rotating speed of target
6, if it is not, then entering step 5；
Step 5, whether current drain charge power is judged more than zero, if so, then maintain to enter step 6 after rotating speed of target is constant, if it is not,
Then enter step 6 after increase rotating speed of target；
Step 6, whether rotating speed of target is judged more than maximum (top) speed, if so, after new rotating speed of target then is defined as into maximum (top) speed
Into step 8, if it is not, then entering step 7；
Step 7, whether maximum (top) speed is judged less than minimum speed, if so, new rotating speed of target is then defined as minimum speed, if
It is no, then enter step 8 after new rotating speed of target being defined as into current rotating speed of target；
Step 8, determine voltage conversion device according to real-time speed power curve track export, when enter limit the Power operation stage,
Into step 9；
Step 9, whether current rotating speed is judged more than new rotating speed of target, if so, enter step 11 after then reducing drain charge electrical voltage point,
If it is not, then entering step 10；
Step 10, whether current rotating speed is judged less than new rotating speed of target, if so, entering step after then improving drain charge electrical voltage point
11, if it is not, then keeping entering step 11 after drain charge electrical voltage point is constant；
Step 11, whether drain charge electrical voltage point drain charge electrical voltage point corresponding more than maximum drain charge power is judged, if so, then by drain charge electricity
Pressure point is set to the corresponding drain charge electrical voltage point of maximum drain charge power, into step 13, if it is not, into step 12；
Step 12, judge drain charge electrical voltage point whether less than current fixed pitch wind-driven generator rotating speed Maximum Power Output when it is corresponding
Electrical voltage point, if so, corresponding when drain charge electrical voltage point then being set into current fixed pitch wind-driven generator rotating speed Maximum Power Output
Electrical voltage point, into step 13, if it is not, then keeping drain charge electrical voltage point to enter step 13；
Step 13, foundation drain charge electrical voltage point carry out drain charge, while return to step 9, with real-time adjustment drain charge electrical voltage point.
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| CN201610885505.XA CN106762408B (en) | 2016-10-10 | 2016-10-10 | A kind of stall control method of fixed pitch wind-driven generator |
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| CN201610885505.XA CN106762408B (en) | 2016-10-10 | 2016-10-10 | A kind of stall control method of fixed pitch wind-driven generator |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107882680A (en) * | 2017-10-13 | 2018-04-06 | 上海致远绿色能源股份有限公司 | A kind of method for controlling number of revolution for wind power generating set |
| CN109695538A (en) * | 2018-12-17 | 2019-04-30 | 上海致远绿色能源股份有限公司 | A kind of method of controlling security of small-sized fan |
| CN109812379A (en) * | 2019-04-10 | 2019-05-28 | 浙江大学 | A kind of marine tidal-current energy machine power of the assembling unit control method of maximization of economic benefit |
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| WO2001066940A1 (en) * | 2000-03-08 | 2001-09-13 | Forskningscenter Risø | A method of operating a turbine |
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| CN109695538A (en) * | 2018-12-17 | 2019-04-30 | 上海致远绿色能源股份有限公司 | A kind of method of controlling security of small-sized fan |
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| CN109812379A (en) * | 2019-04-10 | 2019-05-28 | 浙江大学 | A kind of marine tidal-current energy machine power of the assembling unit control method of maximization of economic benefit |
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