CN109756162A - A kind of permanent magnet direct-drive wind power system obscures MPPT control method and its control device - Google Patents
A kind of permanent magnet direct-drive wind power system obscures MPPT control method and its control device Download PDFInfo
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- CN109756162A CN109756162A CN201910231514.0A CN201910231514A CN109756162A CN 109756162 A CN109756162 A CN 109756162A CN 201910231514 A CN201910231514 A CN 201910231514A CN 109756162 A CN109756162 A CN 109756162A
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Abstract
The invention discloses a kind of permanent magnet direct-drive wind power systems to obscure MPPT control method, the advantage that FPGA processing speed is fast, resourceful is utilized, Fuzzy Processing function and optimal value computing function are realized using the parallel processing mode of pipeline mode, it is improved system response time while realizing the miniaturization of controller volume, has good stability and accuracy；Meanwhile control device humidity resistance corresponding to wind power system is excellent, and safeguards fast, further improves the operation stability of system.
Description
Technical field
The present invention relates to wind-powered electricity generation fields more particularly to a kind of permanent magnet direct-drive wind power system to obscure MPPT control method and its control
Device processed.
Background technique
Compared with traditional energy, wind energy be a kind of rich reserves, it is environmental-friendly, low in cost, there is good development prospect
Renewable energy, the installed capacity of world's blower is continuously increased in recent years.But wind energy is a kind of uncontrollable money naturally
Source has the characteristics that randomness, unstability.Wind energy resources are maximally utilized in order to realize, need to design reasonable
MPPT algorithm controls blower.
Traditional maximum power point tracking method mainly includes tip speed ratio method (Tip Speed Ratio-TSR), power letter
Number feedback control method (Power Signal Feedback-PSF), search by hill climbing method (Hill climbing searching-
HCS).The cardinal principle of tip speed ratio method is, it is ensured that the tip speed ratio λ of blower is always equal to optimum value, the disadvantage is that needing to wind
Speed measures, and the wind speed that can be obtained not is blade actual wind speed, and measures part there are inertia, has to measure and miss
Difference, there is also certain delay, precision is not high in this way for institute.On the other hand, each equipment has a corresponding blade tip speed
Than, it is related with self-characteristic, it can also become inaccuracy with motor ages.Power signal feedback transmitter utilizes power of fan characteristic
Real power control is carried out to adjust revolving speed, needs to preset the working curve of blower, many experiments is needed to test.Search by hill climbing
Method compares the changed power after revolving speed changes in real time, judges current rotating speed present position in power curve, determines lower single order
The rotation speed change of section.This method does not need to measure wind speed, is not influenced by the variation of blower inherent parameters yet, but for
The tracking of maximum power have blindness, there is also passing through repeatedly, influence dynamic property and track power rapidity,
Accuracy.
So needing to invent a kind of small calculation amount, accuracy and the high permanent magnet direct-drive wind power system of stability obscures MPPT control
Method processed and its corresponding control device for having moisture-proof function.
Summary of the invention
Goal of the invention: in order to overcome the deficiencies in the prior art, the present invention provide a kind of small calculation amount, accuracy and
The high permanent magnet direct-drive wind power system of stability obscures MPPT control method and its corresponding control device for having moisture-proof function.
Technical solution: to achieve the above object, a kind of permanent magnet direct-drive wind power system of the invention obscures MPPT control method,
Include the following steps,
Step 1, the measuring device on permanent magnet synchronous motor turn collected revolving speed and power signal by A/D
Corresponding digital quantity signal is exported after parallel operation, fuzzy MPPT controller is passed to, as generator current rotating speed ωrIt is current with system
Power PsSignal；
Step 2, generator current rotating speed ωrWith system current power PS, respectively pass through the delay in a unit sampling time
Later, by comparing unit, rotation speed change value Δ ω is calculatedrWith power change values Δ P；
Step 3, power variation rate Δ Pe is calculated through differentiation element in power change values Δ P, according to fuzzy rule through mould
Paste MPPT controller obtains changed power reference value Δ P*；Rotation speed change value Δ ωrRotation speed change ginseng is obtained through zero compensation unit
Examine value
Step 4, by changed power reference value Δ P*With rotation speed change reference valueOptimal value computing unit is inputted, is obtained
Optimized rotating speed reference value
Step 5 obscures MPPT controller for optimized rotating speed reference valueIt is conveyed to system controller, as permanent-magnet synchronous
The reference value of motor speed closed-loop control；
Step 6, the stator current of generator, electrical angle signal generate voltage and current signal and survey after processing circuit
Signal is measured, system controller is transferred to and carries out control signal calculating, and be conveyed to isolated drive circuit, be then converted into corresponding control
Signal processed controls the supply convertor of permanent magnet synchronous motor.
Further, speed referenceExpression formula are as follows:
ωcFor rotation speed change zero point protection value, k1、k2For two decision thresholds of rotation speed change value, wherein k1For positive value, k2
For negative value.
Further, fuzzy rule is as follows,
Wherein PB is honest, and PS is positive small, and AZ zero, NS are negative small, and NB is negative greatly；
| ΔP/ΔPe | PB | PS | AZ | NS | NB |
| PB | PB | PB | PB | PS | AZ |
| PS | PB | PS | PS | AZ | NS |
| AZ | PB | PS | AZ | NS | NB |
| NS | PS | AZ | NS | NS | NB |
| NB | AZ | NS | NB | NB | NB |
A kind of permanent magnet direct-drive wind power system control device, including warehouse；The warehouse includes the first cavity and the second cavity；
Fuzzy control system is provided in first cavity；Second cavity is connected to setting with the first cavity；Second cavity
The side of interior close first cavity is provided with supply fan；Side in second cavity far from the first cavity is provided with dehumidifying
Unit；The dehumidifying unit includes the first dustproof filter screen and the second dustproof filter screen；First dustproof filter screen and the second dustproof filter screen it
Between clamping be provided with water-absorbent material；Several dehumidifying units are spaced apart from each other setting along the intracorporal air-flow direction of the second chamber；
The dehumidifying unit is embedded from the side wall of the second cavity into wherein.
Further, the Fuzzy control system includes Fuzzy Processing module and optimal value computing module；The fuzzy place
Managing module includes differentiation element and fuzzy MPPT controller；The optimal value computing module include delay unit, comparing unit and
Zero compensation unit.
Further, the direction in the second cavity top sidewall along air flowing is provided with several putting holes；It is described
Dehumidifying unit and putting hole, which are nested, to be arranged；Dehumidifying unit upper end outer rim, which is extended, limitting casing；The limitting casing
It is arranged with the side wall palette of the second cavity；The limitting casing is provided with pressure sensing towards one end of the second cavity wall
Device.
Further, the dehumidifying unit further includes sealing plate；Several sealing plate connections are arranged in the first dust-proof filter
Between net and the second dustproof filter screen；First dustproof filter screen, the second dustproof filter screen and sealing plate enclose top opening jointly
Feeding chamber；The water-absorbent material is seated in feeding chamber.
Further, the water-absorbent material is Bibulous Silica Gel grain.
The utility model has the advantages that a kind of permanent magnet direct-drive wind power system of the invention obscures MPPT control method, FPGA processing is utilized
Fast, the resourceful advantage of speed realizes that Fuzzy Processing function and optimal value calculate using the parallel processing mode of pipeline mode
Function is improved system response time while realizing the miniaturization of controller volume, has good stability and essence
Exactness；Meanwhile control device humidity resistance corresponding to wind power system is excellent, and safeguards fast, further improves system
Operation stability.
Detailed description of the invention
Attached drawing 1 is Fuzzy control system structural schematic diagram；
Attached drawing 2 is wind power system integrated stand composition；
Attached drawing 3 is fuzzy MPPT controller parameter value schematic diagram；
Attached drawing 4 is the first cavity body structure schematic diagram；
Attached drawing 5 is the second cavity body structure schematic diagram.
Specific embodiment
The present invention will be further explained with reference to the accompanying drawing.
A kind of fuzzy MPPT control method of permanent magnet direct-drive wind power system, includes the following steps,
Step 1, as shown in Fig. 2, the measuring device on permanent magnet synchronous motor believe collected revolving speed and power
Corresponding digital quantity signal is exported number after A/D converter, fuzzy MPPT controller is passed to, as generator current rotating speed
ωrWith system current power PsSignal；
Step 2, as shown in Fig. 1, generator current rotating speed ωrWith system current power PS, respectively adopted by a unit
After the delay of sample time, by comparing unit, rotation speed change value Δ ω is calculatedrWith power change values Δ P；
Step 3, power variation rate Δ Pe is calculated through differentiation element in power change values Δ P, according to fuzzy rule through mould
Paste MPPT controller obtains changed power reference value Δ P*；Rotation speed change value Δ ωrRotation speed change ginseng is obtained through zero compensation unit
Examine value
Step 4, by changed power reference value Δ P*With rotation speed change reference valueOptimal value computing unit is inputted, is obtained
Optimized rotating speed reference value
Step 5 obscures MPPT controller for optimized rotating speed reference valueIt is conveyed to system controller, as permanent-magnet synchronous
The reference value of motor speed closed-loop control；
Step 6, the stator current of generator, electrical angle signal generate voltage and current signal and survey after processing circuit
Signal is measured, system controller is transferred to and carries out control signal calculating, and be conveyed to isolated drive circuit, be then converted into corresponding control
Signal processed controls the supply convertor of permanent magnet synchronous motor；
When wind speed changes, if motor is still in current rotating speedLower operation, according to fan characteristic, wind power system
Power can change, and power change values Δ P changes at this time, and system can re-start extremum search, be calculated new
Optimized rotating speed reference valueIt is achieved the control of wind power system maximal power tracing.
As shown in Fig. 2, the processing chip of wind power system controller selects F28335DSP；Isolated drive circuit is to coming from
The pwm signal of DSP carries out driving machine side converter and grid side converter after isolation amplification；The stator current of generator, electrical angle
Signal generates voltage and current signal and the A/D input range measuring signal of suitable F28335DSP, connection after processing circuit
To capturing unit CAP1-2 and the A/D converting unit of F28335DSP, so that DSP is carried out control signal and calculate, and is passed through with digital quantity
Isolated drive circuit is given in the digital output oral instructions of F28335DSP, is then converted into corresponding control signal and carries out to converter
Control；The output of fuzzy MPPT controller based on FPGA is the digital quantity of optimized rotating speed reference value, the number with F28335DSP
Input port is connected, the reference value as permanent magnet synchronous motor speed closed loop control；The encoder being mounted on permanent magnet synchronous motor
Output be connected to the orthogonal pulses coding unit QEP3-4 of F28335DSP, make the practical fortune of F28335DSP survey calculation motor
Market condition.
As shown in Fig. 1, the fuzzy MPPT controller in the permanent magnet direct-drive wind power system based on FPGA includes fuzzy place
Manage module and optimal value computing module；Power difference is handled using Fuzzy Processing module；The Fuzzy Processing module packet
Include differentiation element and fuzzy MPPT controller；The optimal value computing module includes delay unit, comparing unit and zero compensation
Unit；Optimal value computing module has specifically used two groups of delay units, comparing unit and zero compensation unit.
Optimal value computing module used, Fuzzy Processing module all realize that the input of the chip is on one piece of fpga chip
Generator current rotating speed ωrWith system current power PsCorresponding digital signal amount exports as optimized rotating speed reference valueIt is corresponding
Digital signal amount.
Speed referenceExpression formula are as follows:
ωcFor rotation speed change zero point protection value, k1、k2For two decision thresholds of rotation speed change value, wherein k1For positive value, k2
For negative value.
Fuzzy rule is as follows,
Wherein PB is honest, and PS is positive small, and AZ zero, NS are negative small, and NB is negative greatly；
| ΔP/ΔPe | PB | PS | AZ | NS | NB |
| PB | PB | PB | PB | PS | AZ |
| PS | PB | PS | PS | AZ | NS |
| AZ | PB | PS | AZ | NS | NB |
| NS | PS | AZ | NS | NS | NB |
| NB | AZ | NS | NB | NB | NB |
The advantage that FPGA processing speed is fast, resourceful is utilized in fuzzy MPPT controller, using the parallel of pipeline mode
Tupe realizes Fuzzy Processing function and optimal value computing function, is mentioned while realizing the miniaturization of controller volume
High system response time is more suitable for being embedded in wind power control system.
Fuzzy MPPT controller input is only the power and revolving speed of generator, is compared with other methods, does not need to wind speed
It measures, avoids the measurement difficulty and existing measurement error of high-precision wind speed；It does not need to blower model simultaneously yet
Parametric measurement is carried out, the stability and accuracy of controller are improved.
Fuzzy MPPT controller, has carried out Fuzzy processing to power change values Δ P, has searched it relative to traditional climbing the mountain
Rope method can more accurate positioning system currently the position in power curve, the step-size in search of flexible modulation system are mentioned with this
The high rapidity of system；Simultaneously to rotation speed change value Δ ωrZero compensation is carried out, anti-locking system comes near maximum power point
It backs across, improves the accuracy of system.
A kind of permanent magnet direct-drive wind power system control device, as shown in Fig. 4, including warehouse 1；The warehouse 1 includes first
Cavity 11 and the second cavity 12；It is provided with Fuzzy control system in first cavity 11, passes through transmission belt 52 and corresponding extension
Equipment connection；Second cavity 12 and the first cavity 11 are interconnected by the first ventilation mouth 5 to be arranged；As shown in Fig. 2, institute
It states the side in the second cavity 12 close to the first cavity 11 and is provided with supply fan 121；The wind that supply fan 121 imports enters the
Heat after one cavity on control system component is taken away, and is then discharged from the second ventilation mouth 51；It is remote in second cavity 12
Side from the first cavity 11 is provided with dehumidifying unit 13；The dehumidifying unit 13 includes that the first dustproof filter screen 131 and second is anti-
Dirt strainer 132 can prevent the floating dust in air from entering, and component dust stratification is avoided to influence electrical contact and heat dissipation；First is dust-proof
Clamping is provided with water-absorbent material 133 between strainer 131 and the second dustproof filter screen 132, because the device of wind-power electricity generation is usually built
This region stable there are temperature difference wind-force on coastline, so the humidity in air is larger, Long Term Contact component can be led
Corrosion is caused to accelerate, and water-absorbent material 133 can be by the moisture absorption in air, keeping the air for cooling is drying always
's；Air-flow direction of several dehumidifying units 13 in the second cavity 12 is spaced apart from each other setting；The dehumidifying unit 13
It is embedded from the side wall of the second cavity 12 into wherein；Gas passage in second cavity 12 is embedded to be separated in partition 122 wherein
At S type access, several dehumidifying units 13 are distributed on the access, and part can be released at any time and replaced；Second
The air inlet that supply fan 121 is corresponded on cavity 12 is provided with protective net 53, can enter fan to avoid biggish particle and beat
Bad flabellum；Air after several humidity discharging units 13 from third ventilation mouth 54 be discharged external environment in.
Direction in second cavity, 12 top sidewall along air flowing is provided with several putting holes 128；The dehumidifying
Unit 13 and putting hole 128, which are nested, to be arranged；The 13 upper end outer rim of dehumidifying unit, which is extended, limitting casing 134；It is described
The setting of the side wall palette of limitting casing 134 and the second cavity 12；The described one end of limitting casing 132 towards 12 side wall of the second cavity
It is provided with pressure sensor；When water-absorbent material 133 constantly absorbs moisture, its own weight is also being continuously increased, and utilizes pressure
Sensor monitors the weight change of water-absorbent material 133, using related matched signal transmission module these weight informations are defeated
It send to display terminal, so as to immediately renew water-absorbent material 133 when close to saturation, guarantees dehumidifying effect.
The dehumidifying unit 13 further includes sealing plate 135；Several connections of the sealing plate 135 are arranged in the first dustproof filter screen
131 and second between dustproof filter screen 132；First dustproof filter screen 131, the second dustproof filter screen 132 and sealing plate 135 enclose jointly
Synthesize open-topped feeding chamber 136；The water-absorbent material 133 is seated in feeding chamber 136；It is provided at the top of feeding chamber 136
Top cover 140, top cover 140 is sealed with corresponding putting hole 128 to be cooperated.
The water-absorbent material be Bibulous Silica Gel grain, after thin full water vapour only need heat allow wherein steam volatilize again, i.e.,
It is reusable；Gap between silica gel particle can just allow air to pass through, and guarantee that its flowing is unimpeded.
The above is only a preferred embodiment of the present invention, it should be pointed out that: for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (8)
1. a kind of permanent magnet direct-drive wind power system obscures MPPT control method, it is characterised in that: include the following steps,
Collected revolving speed and power signal are passed through A/D converter by step 1, the measuring device on permanent magnet synchronous motor
Corresponding digital quantity signal is exported afterwards, fuzzy MPPT controller is passed to, as generator current rotating speed ωrWith system current power
PsSignal；
Step 2, generator current rotating speed ωrWith system current power PS, respectively after the delay in a unit sampling time,
By comparing unit, rotation speed change value Δ ω is calculatedrWith power change values Δ P；
Power variation rate Δ Pe is calculated through differentiation element in step 3, power change values Δ P, according to fuzzy rule through fuzzy
MPPT controller obtains changed power reference value Δ P*；Rotation speed change value Δ ωrRotation speed change reference is obtained through zero compensation unit
Value
Step 4, by changed power reference value Δ P*With rotation speed change reference valueOptimal value computing unit is inputted, is obtained optimal
Speed reference
Step 5 obscures MPPT controller for optimized rotating speed reference valueIt is conveyed to system controller, as permanent magnet synchronous motor
The reference value of speed closed loop control；
Step 6, the stator current of generator, electrical angle signal generate voltage and current signal and measurement letter after processing circuit
Number, it is transferred to system controller and carries out control signal calculating, and be conveyed to isolated drive circuit, be then converted into corresponding control letter
Number the supply convertor of permanent magnet synchronous motor is controlled.
2. a kind of permanent magnet direct-drive wind power system according to claim 1 obscures MPPT control method, it is characterised in that: revolving speed
Reference valueExpression formula are as follows:
ωcFor rotation speed change zero point protection value, k1、k2For two decision thresholds of rotation speed change value, wherein k1For positive value, k2It is negative
Value.
3. a kind of permanent magnet direct-drive wind power system according to claim 1 obscures MPPT control method, it is characterised in that: fuzzy
Rule is as follows,
Wherein PB is honest, and PS is positive small, and AZ zero, NS are negative small, and NB is negative greatly；
4. a kind of permanent magnet direct-drive wind power system control device, it is characterised in that: including warehouse (1)；The warehouse (1) includes first
Cavity (11) and the second cavity (12)；Fuzzy control system is provided in first cavity (11)；Second cavity (12)
Setting is connected to the first cavity (11)；Side in second cavity (12) close to the first cavity (11) is provided with supply fan
(121)；Side in second cavity (12) far from the first cavity (11) is provided with dehumidifying unit (13)；The dehumidifying unit
It (13) include the first dustproof filter screen (131) and the second dustproof filter screen (132)；First dustproof filter screen (131) and the second dustproof filter screen
(132) clamping is provided with water-absorbent material (133) between；Air stream of several dehumidifying units (13) in the second cavity (12)
Dynamic direction is spaced apart from each other setting；The dehumidifying unit (13) is embedded from the side wall of the second cavity (12) into wherein.
5. a kind of permanent magnet direct-drive wind power system control device according to claim 4, it is characterised in that: the fuzzy control
System includes Fuzzy Processing module and optimal value computing module；The Fuzzy Processing module includes differentiation element and fuzzy MPPT control
Device processed；The optimal value computing module includes delay unit, comparing unit and zero compensation unit.
6. a kind of permanent magnet direct-drive wind power system control device according to claim 4, it is characterised in that: second cavity
(12) direction in top sidewall along air flowing is provided with several putting holes (128)；The dehumidifying unit (13) and putting hole
(128) be nested setting；Dehumidifying unit (13) the upper end outer rim, which is extended, limitting casing (134)；The limitting casing
(134) it is arranged with the side wall palette of the second cavity (12)；The limitting casing (132) towards the second cavity (12) side wall one
End is provided with pressure sensor.
7. a kind of permanent magnet direct-drive wind power system control device according to claim 4, it is characterised in that: the dehumidifying unit
It (13) further include sealing plate (135)；Several sealing plate (135) connection settings are anti-in the first dustproof filter screen (131) and second
Between dirt strainer (132)；First dustproof filter screen (131), the second dustproof filter screen (132) and sealing plate (135) enclose jointly
At open-topped feeding chamber (136)；The water-absorbent material (133) is seated in feeding chamber (136).
8. a kind of permanent magnet direct-drive wind power system control device according to claim 4, it is characterised in that: the water-absorbent material
For Bibulous Silica Gel grain.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113623126A (en) * | 2021-06-23 | 2021-11-09 | 湖南大学 | Direct-drive permanent magnet hydroelectric power generation system control method, system, terminal and readable storage medium based on fuzzy control |
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