CN110460103A - Direct current bus voltage control method suitable for low wind speed profile formula wind-power electricity generation - Google Patents
Direct current bus voltage control method suitable for low wind speed profile formula wind-power electricity generation Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
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Abstract
The invention discloses a kind of direct current bus voltage control methods suitable for low wind speed profile formula wind-power electricity generation, low wind speed profile formula wind generator system includes: wind energy conversion system used by the control method, generator, pusher side inverter, electric capacity of voltage regulation C, net side inverter and DC bus, the low wind speed profile formula wind generator system can be directly accessed AC distribution net, the low wind speed profile formula wind generator system further includes super capacitor, the super capacitor is by accessing on the DC bus on rear side of pusher side inverter after in parallel with two-way DC/DC current transformer, the charge and discharge of the super capacitor in any control cycle T are controlled by DC/DC current transformer to maintain the power stability of the DC bus of injection wind generator system.Method of the invention is able to maintain that the power stability of DC bus, to reduce the delay in the control of net side inverter outer voltage between the d shaft current actual value and reference value of pi regulator output, realizes the voltage stabilization of DC bus.
Description
Technical field
It is specifically a kind of simple and reliable and to promote net side inverter fixed the present invention relates to wind power generation field is belonged to
The direct current bus voltage control method suitable for low wind speed profile formula wind-power electricity generation of voltage-controlling effect.
Background technique
Conventional wind power generation is mostly centralization power generation, and wind speed characteristics are that amplitude is high, turbulent flow is low, in order to preferably develop benefit
It is a beneficial way developing distributed wind-powered electricity generation close to load center with wind energy, and distributed wind-powered electricity generation area wind speed characteristics are
Amplitude is low, turbulent flow is high, needs to find the direct current bus voltage control method for being suitable for low wind speed profile formula wind-powered electricity generation.Pusher side and net side
The control of inverter is the core of permanent magnet direct-drive type wind generator system, and wherein pusher side inverter realizes maximal wind-energy utilization,
Net side inverter uses the vector controlled based on grid voltage orientation, controls DC bus-bar voltage and grid-connected power.In practical work
In work, two sides inverter is connected by DC circuit, therefore controlling DC bus-bar voltage stabilization is to guarantee that two sides inverter can
The key of independent control.For the problem that wind power swing causes net side inverter to be difficult to maintain DC bus-bar voltage stable, pass
The method of system is to use the capacitor of large capacity in direct current component, to increase system inertia, but will lead to the dynamic of system in this way
It can be severely impacted, affect the globality of wind power system.
In the research of the centralized wind field DC bus-bar voltage stability contorting of traditional low turbulent flow of high wind speed, researcher
Propose a variety of methods for improving DC bus-bar voltage.Common method has the transient current based on shunt capacitance in DC bus
The capacitance current for being zero directly control with the power coordination of two sides inverter control, this method establish specific mathematical model it
On, inverter control mechanism is transformed, fast response time, but robustness is poor, is also easy to produce error, it is strong not to be suitable for turbulent flow
Spend bigger low wind speed profile formula wind field.Separately there is research to lack for PI controller dynamic property used in conventional control is insufficient
Point uses fuzzy control to realize dynamic control, which is not necessarily to mathematical models, strong robustness, but its control structure complexity,
It is bad to control precision.
In conclusion the DC bus-bar voltage problem faced is tighter in the distributed wind power plant of the high turbulent flow of low wind speed
It is high.Thus, which improve very necessary.
Summary of the invention
In response to the problems existing in the prior art, the purpose of the present invention is to provide a kind of simple and reliable and can promote the net side change of current
The direct current bus voltage control method suitable for low wind speed profile formula wind-power electricity generation of device constant voltage control effect；The DC bus
By adding super capacitor, super capacitor passes through access pusher side inverter after in parallel with two-way DC/DC current transformer for voltage control
On the DC bus of rear side, the charge and discharge of the super capacitor in any control cycle T are controlled by DC/DC current transformer to maintain to infuse
Enter the power stability of the DC bus of wind generator system, and then realizes the voltage stabilization of DC bus.
The purpose of the present invention is what is solved by the following technical programs:
A kind of direct current bus voltage control method suitable for low wind speed profile formula wind-power electricity generation, the DC bus-bar voltage control
Low wind speed profile formula wind generator system used by method processed includes: wind energy conversion system, generator, pusher side inverter, electric capacity of voltage regulation
C, net side inverter and DC bus, the low wind speed profile formula wind generator system can be directly accessed AC distribution net,
Be characterized in that: the low wind speed profile formula wind generator system further includes super capacitor, the super capacitor by with two-way DC/DC
It accesses on the DC bus on rear side of pusher side inverter after current transformer is in parallel, is controlled in any control cycle T by DC/DC current transformer
Super capacitor charge and discharge come maintain injection wind generator system DC bus power stability, and then realize DC bus
Voltage stabilization.
The super capacitor is controlled using bicyclic PI, and wherein outer ring is power control, inner ring is current control.
Control module for controlling super capacitor charge and discharge is connected with DC/DC current transformer.
The control module is the reference power P that DC bus is input to based on wind power system in control cycle TDC_ref
The realtime power P of DC bus is input to wind power systemPMSGBetween difference PSC_refDC/DC current transformer is controlled,
That is:
PSC_ref=PDC_ref-PPMSG(0<t<T) (1)
In formula (1): PSC_refFor super capacitor reference output power；
Wind power system in control cycle T is input to the mean power P of DC buspredictAs in the control cycle T
Wind power system is input to the reference power P of DC busDC_ref, then:
Ppredict=PDC_ref(0<t<T) (2)
Calculate the realtime power P that wind power system is input to DC busPMSGThe step of are as follows:
S1, the size for detecting the real-time angular velocity omega of generator amature and measuring wind speed v；
S2, the power P that wind energy conversion system is captured from wind energy is calculatedm, formula used are as follows:
In formula (3), R is wind wheel radius, and ρ is atmospheric density, and S is the inswept area of wind machine oar leaf, CpFor wind energy utilization
Coefficient, β are propeller pitch angle, and λ is tip speed ratio and lambda definition is λ=ω R/v；
S3, the P obtained by step S2mThe power loss of the power loss and generator that remove generator-side converter wear can obtain wind-powered electricity generation
System is input to the realtime power P of DC busPMSG, formula used is as follows:
PPMSG=Pm-ΔP1-ΔP2 (4)
In formula (4), Δ P1For the power loss of generator；ΔP2For the power loss of pusher side inverter.
The control module includes several computing modules and power P I controller and electric current PI controller, control week
Wind power system is input to the mean power P of DC bus in phase TpredictThe realtime power of DC bus is input to wind power system
PPMSGThe difference for being input to the acquisition of first computing module is super capacitor reference output power PSC_ref, super capacitor is with reference to defeated
Power P outSC_refWith the real-time output power P of super capacitorSCThe deviation for being input to the acquisition of second computing module is controlled by power P I
Super capacitor is obtained after device processed with reference to output electric current ISC_ref, super capacitor is with reference to output electric current ISC_refIt is defeated in real time with super capacitor
Electric current I outSCThe deviation for being input to the acquisition of third computing module generates mutually using the signal that an electric current PI controller obtains
The pwm signal of benefit, the pwm signal input DC/DC current transformer of the complementation simultaneously control it.
When wind power system is input to the realtime power P of DC busPMSGIt is input to directly greater than wind power system in control cycle T
Flow the mean power P of buspredictWhen, super capacitor is in charged state；When wind power system is input to the real-time of DC bus
Power PPMSGLess than the mean power P that wind power system in control cycle T is input to DC buspredictWhen, super capacitor is in and puts
Electricity condition.
The DC/DC current transformer includes controllable power switch tube S1With the diode D of its reverse parallel connection1, controllable function
Rate switching tube S2With the diode D of its reverse parallel connection2And the PWM module as drive module, wherein PWM module is for receiving
The complementary pwm signal that control module issues, by power switch tube S1And power switch tube S2Receive the complementation of PWM module transmitting
Pwm signal carry out the duty ratio of regulation power switching tube S1 and power switch tube S 2 to control power switch tube S 1 or power switch
The on-off of pipe S2 realizes the charge and discharge of super capacitor.
The super capacitor is by accessing pusher side inverter and electric capacity of voltage regulation C after in parallel with two-way DC/DC current transformer
Between DC bus on.
The super capacitor is in parallel with DC/DC current transformer again after connecting with stabilizing inducatnce L.
The generator is direct-drive permanent magnet synchronous aerogenerator.
It is further to note that: wind power system is input to the mean power P of DC bus in control cycle TpredictIt is real
It is predicted value in matter, which can carry out wind power prediction using common prediction technique now, and common method is based on
The physical method of the factors such as weather, landform and algorithm based on mathematical statistics, such as autoregressive moving-average model, artificial neural network
Network, wavelet analysis and support vector machines etc.；After one control cycle T, P is predicted againpredictValue and enter it is next
Control cycle T.
The present invention has the following advantages compared with prior art:
1) direct current bus voltage control method of the invention is not necessarily to carry out complicated change to the control strategy of original inverter
It makes, and starts with from power perspective, control strategy is simple and easy, and improves the control effect of original control strategy；
2) wind power system is input to DC bus in the control cycle T that direct current bus voltage control method of the invention introduces
Mean power PpredictSubstantially predicted value, the predicted value can contain following variation tendency, tool to a certain extent
There is good feed-forward characteristic, improves the accuracy and rapidity of super capacitor control, and answer right low wind speed profile well
Influence of the high turbulent flow wind speed in formula wind-powered electricity generation area to the DC bus-bar voltage of wind generator system；
3) present invention is aided with super capacitor with the power of average mode smooth wind power unit injection DC bus, super electricity
Appearance belongs to power-type energy storage device, can quickly carry out power compensation, and it is high that degree can be performed；
4) wind power system in control cycle T is input to the mean power P of DC bus by the present inventionpredictAs the control
Wind power system is input to the reference power P of DC bus in cycle TDC_ref, then super capacitor need to only compensate power shortage, save
The capacity of energy storage device.
Detailed description of the invention
Attached drawing 1 be direct current bus voltage control method of the invention based on low wind speed profile formula wind generator system knot
Structure schematic diagram；
Attached drawing 2 is super capacitor, DC/DC current transformer and control employed in direct current bus voltage control method of the invention
The attachment structure schematic diagram of module；
Attached drawing 3 is the realization principle figure of direct current bus voltage control method of the invention；
Attached drawing 4 is the Velocity-time relational graph of high turbulence intensity wind speed；
Attached drawing 5 is the Velocity-time relational graph of low turbulence intensity wind speed；
Attached drawing 6 is to use to be input to direct current mother when direct current bus voltage control method proposed by the present invention under high turbulent flow wind speed
The realtime power P of lineDC(high)；
Attached drawing 7 is that the reality that DC bus is input to when traditional direct current bus voltage control method is used under high turbulent flow wind speed
When power PDC(high)；
Attached drawing 8 is DC bus-bar voltage when using direct current bus voltage control method proposed by the present invention under high turbulent flow wind speed
UDC(high)The case where；
Attached drawing 9 is DC bus-bar voltage U when using traditional direct current bus voltage control method under high turbulent flow wind speedDC(high)
The case where；
Attached drawing 10 is to use to be input to direct current when direct current bus voltage control method proposed by the present invention under low turbulent flow wind speed
The realtime power P of busDC(low)；
Attached drawing 11 is to use to be input to DC bus when traditional direct current bus voltage control method under low turbulent flow wind speed
Realtime power PDC(low)；
Attached drawing 12 is DC bus electricity when using direct current bus voltage control method proposed by the present invention under low turbulent flow wind speed
Press UDC(low)The case where；
Attached drawing 13 is DC bus-bar voltage when using traditional direct current bus voltage control method under low turbulent flow wind speed
UDC(low)The case where；
Attached drawing 14 is that super capacitor is defeated when using direct current bus voltage control method proposed by the present invention under high turbulent flow wind speed
Power P outSC(high)；
Attached drawing 15 is that super capacitor is defeated when using direct current bus voltage control method proposed by the present invention under low turbulent flow wind speed
Power P outSC(low)。
Specific embodiment
The present invention will be further described below with reference to the accompanying drawings and embodiments.
Low wind speed profile formula wind generator system as shown in Figure 1, which includes: wind
Power machine, direct-drive permanent magnet synchronous aerogenerator D-PMSG, pusher side inverter, electric capacity of voltage regulation C, net side inverter and direct current are female
Line, the low wind speed profile formula wind generator system can be directly accessed AC distribution net, the low wind speed profile formula wind-power electricity generation system
System further includes super capacitor, and the super capacitor is by accessing pusher side inverter and pressure stabilizing after in parallel with two-way DC/DC current transformer
On DC bus between capacitor C, by DC/DC current transformer control it is any control cycle T in super capacitor charge and discharge come
The power stability of the DC bus of injection wind generator system is maintained, and then realizes the voltage stabilization of DC bus.
The attachment structure schematic diagram of super capacitor, DC/DC current transformer and control module as shown in Figure 2, the part is by surpassing
Grade capacitor, stabilizing inducatnce L, DC/DC current transformer, control module are constituted, and wherein DC/DC current transformer is by switching tube S1/D1And S2/D2
And its drive module --- PWM module is constituted.In Fig. 2, L is and the concatenated stabilizing inducatnce of super capacitor；uSCFor super capacitor
Both end voltage；uDCFor the both end voltage of electric capacity of voltage regulation C in parallel in DC bus；S1/D1、S2/D2It is that controllable power is opened respectively
Close pipe and the diode of its reverse parallel connection；ISCElectric current is exported in real time for super capacitor；ISC_refIt is super capacitor with reference to output electricity
Stream；PSCFor the real-time output power of super capacitor；PSC_refFor super capacitor reference output power；PpredictFor wind in control cycle T
Electric system is input to the mean power of DC bus；PPMSGThe realtime power of DC bus is input to for wind power system.Each control
In cycle T processed, the control module for controlling super capacitor is controlled using bicyclic PI, and wherein outer ring is power control, inner ring is electric current
Control.In outer loop control, the mean power P that wind power system in cycle T is input to DC bus is controlledpredictIt is defeated with wind power system
Enter the realtime power P to DC busPMSGDifference be super capacitor reference output power PSC_ref, super capacitor is with reference to output
Power PSC_refWith the real-time output power P of super capacitorSCDeviation obtained after power P I controller super capacitor with reference to output
Electric current ISC_ref；In inner loop control, super capacitor is with reference to output electric current ISC_refExport electric current I in real time with super capacitorSCDeviation
Complementary pwm signal is generated using the signal that an electric current PI controller obtains；By power switch tube S1And power switch tube S2
Receive complementary pwm signal carry out the duty ratio of regulation power switching tube S1 and power switch tube S 2 with control power switch tube S 1 or
The on-off of power switch tube S 2 realizes the two-way charge and discharge of super capacitor.When wind power system is input to the real-time function of DC bus
Rate PPMSGGreater than the mean power P that wind power system in control cycle T is input to DC buspredictWhen, super capacitor is in charging
State；When wind power system is input to the realtime power P of DC busPMSGDirect current is input to less than wind power system in control cycle T
The mean power P of buspredictWhen, super capacitor is in discharge condition.
In order to further describe technical characterstic and effect of the invention, below in conjunction with the drawings and specific embodiments to this hair
It is bright to be described further.
Referring to attached drawing 3, certain is calculated using wind power prediction method appropriate in implementation method according to the present invention first
Wind power system is input to the mean power P of DC bus in control cycle Tpredict, then wind power system is calculated and is input to directly
Flow the realtime power P of busPMSG, this makes it possible to obtain super capacitor reference output power PSC_ref, to carry out super capacitor control
System.Periodically adjustment controls the mean power P that wind power system in cycle T is input to DC buspredict, i.e., using this hair
The direct current bus voltage control method of bright offer carries out the control of the DC bus-bar voltage of wind generator system, realizes DC bus
Voltage stabilization.
The embodiment of the present invention gives the wind speed curve of high and low two kinds of turbulence intensities first, is then utilized respectively tradition
Control strategy and control strategy of the invention carry out simulation study, simulation results show effectiveness of the invention and superiority.
One, the simulation model of embodiment
The reference voltage of DC bus is 800V, wind energy conversion system optimum tip-speed ratio λoptIt is 0.81, control cycle T is taken as
10s emulates duration 20s.It is as shown in table 1 to emulate other major parameters used.
The major parameter that the emulation of table 1 uses
Two, the realization of the method for the present invention
Simulation analysis is carried out using attached drawing 2 and the wind speed of attached high and low two kinds of turbulence intensities shown in Fig. 3.It is given by the present invention
Out the step of, periodically adjusts Ppredict, to control the output power of super capacitor, make to input the straight of wind generator system
The power for flowing bus keeps stablizing, and carrys out stable DC busbar voltage with this.
Direct current bus voltage control method of the invention is by predicting that wind power system is input to direct current mother in certain control cycle T
The mean power P of linepredictCome the power for controlling super capacitor charge and discharge to maintain the DC bus of injection wind generator system
Stablize, formula used in the direct current bus voltage control method are as follows:
PSC_ref=PDC_ref-PPMSG(0<t<T) (1)
In formula (1): PSC_refFor super capacitor reference output power, PDC_refIt is input to for wind power system in control cycle T
The reference power of DC bus, PPMSGThe realtime power of DC bus is input to for wind power system；
Wind power system in control cycle T is input to the mean power P of DC buspredictAs in the control cycle T
Wind power system is input to the reference power P of DC busDC_ref, then:
Ppredict=PDC_ref(0<t<T) (2)
Calculate the realtime power P that wind power system is input to DC busPMSGThe step of are as follows:
S1, detect direct-drive permanent magnet synchronous aerogenerator rotor real-time angular velocity omega and measure the size of wind speed v；
S2, the power P that wind energy conversion system is captured from wind energy is calculatedm, formula used are as follows:
In formula (3), R is wind wheel radius, and ρ is atmospheric density, and S is the inswept area of wind machine oar leaf, CpFor wind energy utilization
Coefficient, β are propeller pitch angle, and λ is tip speed ratio and lambda definition is λ=ω R/v；
S3, the P obtained by step S2mRemove the power loss of generator-side converter wear and the function of direct-drive permanent magnet synchronous aerogenerator
Rate loss can obtain the realtime power P that wind power system is input to DC busPMSG, formula used is as follows:
PPMSG=Pm-ΔP1-ΔP2 (4)
In formula (4), Δ P1For the power loss of direct-drive permanent magnet synchronous aerogenerator；ΔP2For the power of pusher side inverter
Loss.
Wherein, the mean power P that wind power system in cycle T is input to DC bus is controlled for onepredict, available
Existing Common Prediction Method obtains, and is then updated periodically PpredictValue.
Furthermore as shown in Fig. 2, super capacitor passes through the direct current of two-way a DC/DC current transformer and wind generator system
Bus front end is connected, and in each control cycle T, for super capacitor using double PI controls, the control module of super capacitor includes several
A computing module and power P I controller and electric current PI controller control wind power system in cycle T and are input to DC bus
Mean power PpredictThe realtime power P of DC bus is input to wind power systemPMSGIt is input to what first computing module obtained
Difference is super capacitor reference output power PSC_ref, super capacitor reference output power PSC_refWith the real-time output work of super capacitor
Rate PSCThe deviation for being input to the acquisition of second computing module obtains super capacitor with reference to output electric current after power P I controller
ISC_ref, super capacitor is with reference to output electric current ISC_refExport electric current I in real time with super capacitorSCThird computing module is input to obtain
The deviation obtained generates complementary pwm signal, the pwm signal input of the complementation using the signal that an electric current PI controller obtains
DC/DC current transformer simultaneously controls it；PWM module in DC/DC current transformer is used to receive the complementation of control module sending
Pwm signal, by power switch tube S1And power switch tube S2The complementary pwm signal for receiving PWM module transmitting carrys out regulation power and opens
The duty ratio of pipe S1 and power switch tube S 2 is closed to control the on-off of power switch tube S 1 or power switch tube S 2, realizes super electricity
The charge and discharge of appearance.When wind power system is input to the realtime power P of DC busPMSGGreater than wind power system input in control cycle T
To the mean power P of DC buspredictWhen, super capacitor is in charged state；When wind power system is input to DC bus
Realtime power PPMSGLess than the mean power P that wind power system in control cycle T is input to DC buspredictWhen, at super capacitor
In discharge condition.
Three, the interpretation of result of embodiment
When generator of the invention uses direct-drive permanent magnet synchronous aerogenerator, using high and low two kinds of turbulence intensity wind
Speed carries out the validity of the direct current bus voltage control method proposed by the present invention suitable for low wind speed profile formula wind-power electricity generation
Analysis, then by the direct current bus voltage control method proposed by the present invention suitable for low wind speed profile formula wind-power electricity generation and traditional
Permanent magnet direct-drive type wind-power electricity generation direct current bus voltage control method is compared, and is controlled with the verifying present invention in DC bus-bar voltage
Superiority of the approach application in low wind speed profile formula permanent magnet direct-drive wind generator system.
(1) comparative analysis under high turbulent flow wind speed
It is emulated under attached wind friction velocity shown in Fig. 4.By attached drawing 6 and attached drawing 7 it is found that using control of the invention
When scheme, in each control cycle T, it is input to the realtime power P of DC busDC(high)Compared with using traditional approach Shi Yaowen
It is fixed.By attached drawing 8 and attached drawing 9 it is found that when using control program of the invention, the DC bus-bar voltage of wind generator system
UDC(high)Fluctuation is smaller compared with using traditional approach, wherein attached DC bus-bar voltage shown in Fig. 8, it is flat after stablizing
Equal absolute error is 1.205V；And mean absolute error has then reached 4.245V to DC bus-bar voltage shown in attached drawing 9 after stabilization.
(2) comparative analysis under low turbulent flow wind speed
It is emulated under attached wind friction velocity shown in fig. 5.By attached drawing 10 and attached drawing 11 it is found that using control of the invention
When scheme processed, in each control period, it is input to the realtime power P of DC busDC(low)It is wanted when compared with using traditional approach
Stablize.By attached drawing 12 and attached drawing 13 it is found that when using control program of the invention, the DC bus-bar voltage of wind generator system
UDC(low)Fluctuation is smaller compared with using traditional approach, wherein DC bus-bar voltage shown in attached drawing 12, it is flat after stablizing
Equal absolute error is 0.6935V；And mean absolute error then reaches DC bus-bar voltage shown in attached drawing 13 after stabilization
1.591V。
(3) super capacitor Working state analysis
As shown in Figure 14, Figure 15, when using control method of the invention, whether high turbulent flow wind speed or low turbulent wind
Under speed, the output power of super capacitor is fluctuated above and below 0 value, and illustrating it only need to carry out " peak load shifting " of power, is mended
Power shortage is repaid, saves the quota and engineering cost of super capacitor in this way.
The above examples only illustrate the technical idea of the present invention, and this does not limit the scope of protection of the present invention, all
According to the technical idea provided by the invention, any changes made on the basis of the technical scheme each falls within the scope of the present invention
Within；The technology that the present invention is not directed to can be realized by the prior art.
Claims (10)
1. a kind of direct current bus voltage control method suitable for low wind speed profile formula wind-power electricity generation, DC bus-bar voltage control
Low wind speed profile formula wind generator system used by method include: wind energy conversion system, generator, pusher side inverter, electric capacity of voltage regulation C,
Net side inverter and DC bus, the low wind speed profile formula wind generator system can be directly accessed AC distribution net, special
Sign is: the low wind speed profile formula wind generator system further includes super capacitor, and the super capacitor with two-way DC/DC by becoming
It accesses on the DC bus on rear side of pusher side inverter after flowing device parallel connection, is controlled in any control cycle T by DC/DC current transformer
The charge and discharge of super capacitor maintain the power stability of the DC bus of injection wind generator system, and then realize DC bus
Voltage stabilization.
2. the direct current bus voltage control method according to claim 1 suitable for low wind speed profile formula wind-power electricity generation,
Be characterized in that: the super capacitor is controlled using bicyclic PI, and wherein outer ring is power control, inner ring is current control.
3. the direct current bus voltage control method according to claim 1 suitable for low wind speed profile formula wind-power electricity generation,
Be characterized in that: the control module for controlling super capacitor charge and discharge is connected with DC/DC current transformer.
4. the direct current bus voltage control method according to claim 3 suitable for low wind speed profile formula wind-power electricity generation,
Be characterized in that: the control module is the reference power P that DC bus is input to based on wind power system in control cycle TDC_ref
The realtime power P of DC bus is input to wind power systemPMSGBetween difference PSC_refDC/DC current transformer is controlled,
That is:
PSC_ref=PDC_ref-PPMSG(0<t<T) (1)
In formula (1): PSC_refFor super capacitor reference output power；
Wind power system in control cycle T is input to the mean power P of DC buspredictAs wind-powered electricity generation system in the control cycle T
System is input to the reference power P of DC busDC_ref, then:
Ppredict=PDC_ref(0<t<T) (2)
Calculate the realtime power P that wind power system is input to DC busPMSGThe step of are as follows:
S1, the size for detecting the real-time angular velocity omega of generator amature and measuring wind speed v；
S2, the power P that wind energy conversion system is captured from wind energy is calculatedm, formula used are as follows:
In formula (3), R is wind wheel radius, and ρ is atmospheric density, and S is the inswept area of wind machine oar leaf, CpFor power coefficient, β
For propeller pitch angle, λ is tip speed ratio and lambda definition is λ=ω R/v；
S3, the P obtained by step S2mThe power loss of the power loss and generator that remove generator-side converter wear can obtain wind power system
It is input to the realtime power P of DC busPMSG, formula used is as follows:
PPMSG=Pm-ΔP1-ΔP2 (4)
In formula (4), Δ P1For the power loss of generator；ΔP2For the power loss of pusher side inverter.
5. the direct current bus voltage control method according to claim 4 suitable for low wind speed profile formula wind-power electricity generation,
Be characterized in that: the control module includes several computing modules and power P I controller and electric current PI controller, control
Wind power system is input to the mean power P of DC bus in cycle TpredictThe real-time function of DC bus is input to wind power system
Rate PPMSGThe difference for being input to the acquisition of first computing module is super capacitor reference output power PSC_ref, super capacitor reference
Output power PSC_refWith the real-time output power P of super capacitorSCThe deviation of second computing module acquisition is input to by power P I
Super capacitor is obtained after controller with reference to output electric current ISC_ref, super capacitor is with reference to output electric current ISC_refIt is real-time with super capacitor
Export electric current ISCThe deviation for being input to the acquisition of third computing module is generated using the signal that an electric current PI controller obtains
Complementary pwm signal, the pwm signal input DC/DC current transformer of the complementation simultaneously control it.
6. the direct current bus voltage control method according to claim 5 suitable for low wind speed profile formula wind-power electricity generation,
It is characterized in that: when wind power system is input to the realtime power P of DC busPMSGIt is input to greater than wind power system in control cycle T
The mean power P of DC buspredictWhen, super capacitor is in charged state；When wind power system is input to the reality of DC bus
When power PPMSGLess than the mean power P that wind power system in control cycle T is input to DC buspredictWhen, super capacitor is in
Discharge condition.
7. the direct current bus voltage control method according to claim 3 suitable for low wind speed profile formula wind-power electricity generation,
Be characterized in that: the DC/DC current transformer includes controllable power switch tube S1With the diode D of its reverse parallel connection1, it is controllable
Power switch tube S2With the diode D of its reverse parallel connection2And the PWM module as drive module, wherein PWM module is for connecing
The complementary pwm signal that control module issues is received, by power switch tube S1And power switch tube S2Receive the mutual of PWM module transmitting
The duty ratio that the pwm signal of benefit comes regulation power switching tube S1 and power switch tube S 2 is opened with controlling power switch tube S 1 or power
The on-off for closing pipe S2, realizes the charge and discharge of super capacitor.
8. the direct current bus voltage control method according to claim 1 suitable for low wind speed profile formula wind-power electricity generation,
Be characterized in that: the super capacitor is by accessing pusher side inverter and electric capacity of voltage regulation C after in parallel with two-way DC/DC current transformer
Between DC bus on.
9. the direct current bus voltage control method suitable for low wind speed profile formula wind-power electricity generation according to claim 1 or 8,
It is characterized by: the super capacitor is in parallel with DC/DC current transformer again after connecting with stabilizing inducatnce L.
10. the direct current bus voltage control method according to claim 1 suitable for low wind speed profile formula wind-power electricity generation,
Be characterized in that: the generator is direct-drive permanent magnet synchronous aerogenerator.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111146938A (en) * | 2020-01-21 | 2020-05-12 | 澄瑞电力科技（上海）有限公司 | DC converter variable coefficient power compensation method and system |
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| CN104578148A (en) * | 2014-12-23 | 2015-04-29 | 许昌学院 | Permanent magnetic direct drive type wind power system mode switching control method |
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Application publication date: 20191115 |