CN108599643B - Power tracking control method and device for wind driven generator - Google Patents

Power tracking control method and device for wind driven generator Download PDF

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CN108599643B
CN108599643B CN201810271466.3A CN201810271466A CN108599643B CN 108599643 B CN108599643 B CN 108599643B CN 201810271466 A CN201810271466 A CN 201810271466A CN 108599643 B CN108599643 B CN 108599643B
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converter
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power
current
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CN108599643A (en
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张为民
周一晨
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HEFEI WIN POWER CO Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P2101/00—Special adaptation of control arrangements for generators
    • H02P2101/15—Special adaptation of control arrangements for generators for wind-driven turbines
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/76—Power conversion electric or electronic aspects

Abstract

The invention discloses a wind power generator functionA rate tracking control method and a device relate to the technical field of wind power generation, and the method comprises the following steps: a. sampling output current i of wind driven generator after three-phase rectification1And obtaining a given reference current i*(ii) a b. According to the sampled current i1With a given reference current i*And current formula of inductor in DC/DC converterCalculating the conduction time increment delta t of a switching tube in the DC/DC converter to be t-t0(ii) a c. Obtaining an initial duty cycle D of a DC/DC converter control signal0According to the initial duty cycle D0And obtaining the adjusted control signal duty ratio D by the conduction time increment delta t; d. and generating a corresponding PWM control signal according to the calculated duty ratio D, and inputting the PWM control signal to a control signal input end of the DC/DC converter for power tracking control. The scheme of the invention tracks the power according to the self parameters of the system and the collected electric signals, does not directly adopt PID closed-loop control, and has the advantage of rapid and stable control.

Description

Power tracking control method and device for wind driven generator
Technical Field
The invention relates to the technical field of wind power generation, in particular to a method and a device for tracking and controlling power of a wind power generator.
Background
The existing wind power generator power tracking control method generally inputs the actual output electric signal and the reference output electric signal of the generator into a PID (proportional integral derivative) controller to realize the control of the output power of the fan, and the control system adopts the PID controller, although the control principle of the PID controller is simple, the PID controller only carries out error regulation according to three fixed coefficients, does not consider the real-time running state of the system, does not carry out power correction according to the electric signal parameters of the system, and has an unsatisfactory regulating effect for a nonlinear system or a time-varying system. And because PID needs to be compared and judged repeatedly, the adjustment time is long, the output power of the fan cannot respond to the change of external wind speed and other factors quickly, the timeliness and precision of the system are not high, and the maximum power tracking control is difficult to realize accurately.
Disclosure of Invention
The invention provides a novel fan power tracking control scheme for solving the problems in the prior art, the scheme adjusts the power according to the real-time running state of the system and the parameters of the system, has high adjustment precision and high speed, and can realize good adjustment effect.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a wind power generator power tracking control method is applied to a circuit structure that the output of a wind power generator is connected with a DC/DC converter after three-phase rectification, and comprises the following steps:
a. sampling output current i of wind driven generator after three-phase rectification1And obtaining a given reference current i;
b. according to the sampled current i1With a given reference current i, and the current formula of the inductor in the DC/DC converter
Figure RE-GDA0001692521710000021
Calculating the conduction time increment delta t of a switching tube in the DC/DC converter to be t-t0Wherein i isl(t) the current in the inductor at the end of the power regulation, with a value equal to i; i.e. il(t0) For power regulation of the value of the current in the inductor at the start of the power regulation, the value of which is equal to i1L is the inductance, u (ξ) is the voltage across the inductance, which is a variable that varies with time ξ, t0The power regulation starting time is t, and the power regulation terminating time is t;
c. obtaining an initial duty cycle D of a DC/DC converter control signal0According to the initial duty cycle D0And obtaining the adjusted control signal duty ratio D by the conduction time increment delta t;
d. and generating a corresponding PWM control signal according to the calculated duty ratio D, and inputting the PWM control signal to a control signal input end of the DC/DC converter for power tracking control.
Further, the specific method for obtaining the given reference current i in the step a includes:
sampling output voltage u of wind driven generator after three-phase rectification1Obtaining the output voltage u according to the voltage-current characteristic curve of the fan1A corresponding given reference current i;
further, the specific method for obtaining the given reference current i in the step a includes:
collectingFrequency f of AC voltage output by wind power generatorwAnd the output voltage u after three-phase rectification1(ii) a According to the formula w ═ fw/pNCalculating the rotational speed w of the wind turbine, where pNIs the number of magnetic pole pairs; acquiring power corresponding to the rotating speed w of the wind driven generator according to a rotating speed power characteristic curve of the generator, wherein the power is given reference power p; equation of basis
Figure RE-GDA0001692521710000022
A given reference current i is calculated.
Further, in the step c, an initial duty ratio D of the control signal of the DC/DC converter is obtained0The specific method comprises the following steps:
collecting output voltage u after three-phase rectification1And the output terminal voltage u of the DC/DC converter2(ii) a When the DC/DC converter is a topological structure of a boost chopper circuit, the formula is calculatedCalculating the initial duty ratio of the control signal of the switching tube
Figure RE-GDA0001692521710000031
When the DC/DC converter is a topological structure of a buck chopper circuit, the formula is shown
Figure RE-GDA0001692521710000032
Calculating the initial duty ratio of the control signal of the switching tubeWherein, tonIs the on-time of the switch tube, toffFor the cut-off duration of the switching tube, tsIs the period of the control signal, and ts＝ton+toff。
Further, the power tracking control method further includes a correction by using a closed-loop feedback method, where the closed-loop feedback method specifically includes:
inputting the output electric signal parameters of the wind driven generator after three-phase rectification and the given reference electric signal parameters into a PID regulator for PID error regulation and outputting closed loop correction signals; and c, superposing the closed loop correction signal and the signal with the duty ratio calculated in the step c, generating a PWM control signal, and inputting the PWM control signal to a control signal input end of the DC/DC converter for power tracking control.
Further, the three-phase rectified output electrical signal parameter and the given reference electrical signal parameter are three-phase rectified output current i1And a given reference current i x,
further, the three-phase rectified output electrical signal parameter and the given reference electrical signal parameter are three-phase rectified output power p1And a given reference power p.
The invention also provides a wind power generator power tracking control device, which is applied to a circuit structure that the output of the wind power generator is connected with a DC/DC converter after three-phase rectification, and the power tracking control device comprises:
the current acquisition unit is used for sampling the output current i of the wind driven generator after three-phase rectification1And obtaining a given reference current i;
a conduction time period calculation unit for calculating the conduction time period according to the sampled current i1With a given reference current i, and the current formula of the inductor in the DC/DC converter
Figure RE-GDA0001692521710000034
Calculating the conduction time increment delta t of a switching tube in the DC/DC converter to be t-t0Wherein i isl(t) the current in the inductor at the end of the power regulation, with a value equal to i; i.e. il(t0) For power regulation of the value of the current in the inductor at the start of the power regulation, the value of which is equal to i1L is inductance, u (ξ) is voltage across the inductance, t0The power regulation starting time is t, and the power regulation terminating time is t;
a duty ratio calculation unit for obtaining an initial duty ratio D of the DC/DC converter control signal0According to the initial duty cycle D0And obtaining the adjusted control signal duty ratio D by the conduction time increment delta t;
the PWM control unit is used for generating a PWM control signal according to the calculated duty ratio D and inputting the PWM control signal to a control signal input end of the DC/DC converter for power tracking control;
and the DC/DC converter is connected with the PWM control unit and is used for receiving the PWM control signal generated by the PWM control unit to carry out power tracking control.
Further, the power tracking control apparatus further includes:
a PID regulator: the system is used for receiving the output electric signal parameters of the wind driven generator after three-phase rectification and given reference electric signal parameters, and outputting closed-loop correction signals after PID error adjustment;
the superposition unit is used for superposing the closed-loop correction signal and the signal of which the duty ratio is calculated by the duty ratio calculation unit and inputting the superposed signals into the PWM control unit;
and the PWM control unit is also used for generating a PWM control signal according to the superposed signal and inputting the PWM control signal to a control signal input end of the DC/DC converter for power tracking control.
Compared with the prior art, the invention has the following advantages:
1. compared with the traditional PID closed-loop feedback regulation method according to a fixed coefficient, the power control method for real-time error regulation according to the system running state and the electric signal parameter is adopted, and deviation control is realized according to the state parameter of the power control method.
2. The result of the power tracking control is corrected by using PID closed loop feedback, so that the power tracking control precision can be further improved.
Drawings
Fig. 1 and fig. 2 are schematic diagrams of a power tracking control method of a wind generating set.
FIG. 3 is a schematic diagram of a method for combining power tracking control of a wind generating set with closed loop correction.
Fig. 4(a) is a topology diagram of a buck chopper circuit of the DC/DC converter according to the embodiment of the present invention.
Fig. 4(b) is a topology diagram of a boost chopper circuit of the DC/DC converter according to the embodiment of the present invention.
FIG. 5 is a block diagram of a wind turbine power tracking control system according to the present invention.
Fig. 6 is a block diagram of the internal architecture of the control unit of the power tracking control apparatus according to the embodiment of the present invention.
Detailed Description
The following detailed description of the present invention will be made in conjunction with the accompanying drawings, but the scope of the present invention is not limited to the following detailed description.
The invention discloses a power tracking control method of a wind driven generator, which comprises the following steps: the method comprises the steps of connecting the output of a wind driven generator after three-phase rectification with a DC/DC converter, sampling the output of the wind driven generator after three-phase rectification, calculating the duty ratio of a PWM control signal of the DC/DC converter according to the sampled electric signal parameters and the system parameters, generating the PWM control signal according to the calculated duty ratio for power tracking control, wherein the electric signal parameters comprise current, voltage, power and the like, and the system parameters comprise system given reference electric signal parameters, inductance, capacitance, resistance and the like.
In the power tracking control, power deviation adjustment is performed according to a voltage-current characteristic curve, a rotational speed-power characteristic curve, a voltage-power characteristic curve, or a rotational speed-current characteristic curve of the fan. In the following embodiments, the power tracking control method will be described in detail by taking the example of performing the power offset adjustment using the voltage-current characteristic curve and the rotational speed-power characteristic curve.
The power tracking control mode of the invention is to calculate the duty ratio of the control signal of the DC/DC converter and adjust the power output by adjusting the size of the duty ratio in real time. The DC/DC converter includes various topologies, for example, a Buck Chopper circuit (Buck Chopper), a Boost Chopper circuit (Boost Chopper), a Buck-Boost Chopper circuit (Buck-Boost Chopper), a Cuk Chopper circuit, a Sepic Chopper circuit, a Zeta Chopper circuit, and the like, where the Buck Chopper circuit and the Boost Chopper circuit are two most typical basic topologies, and in the embodiment, the two typical topologies are taken as examples to specifically describe the calculation method of the PWM control signal duty ratio, and DC/DC converters of other topologies can derive the duty ratio of the control signal by referring to the two typical topologies, so as to perform power tracking control.
Fig. 1 and 2 are schematic diagrams of a power tracking control method of a wind generating set according to the present invention, fig. 1 is a schematic diagram of a power tracking control method for obtaining a given reference current according to a voltage-current characteristic curve, fig. 2 is a schematic diagram of a power tracking control method for obtaining a given reference current according to a rotational speed-power characteristic curve, fig. 4(a) and fig. 4(b) show two typical topologies of a DC/DC converter, wherein fig. 4(a) shows a topology of a buck chopper circuit, fig. 4(b) shows a topology of a boost chopper circuit, and referring to fig. 1 and 2, and fig. 4(a) and fig. 4(b), a method for calculating a duty ratio of a DC/DC converter is as follows:
s101: sampling output current i of wind driven generator after three-phase rectification1And a given reference current i is obtained.
In specific implementation, a permanent magnet synchronous wind power generator PMSG can be adopted, and alternating current output by the PMSG is rectified in three phases and then input to a DC/DC converter for power conversion.
The method firstly samples the output current i of the wind driven generator after three-phase rectification1And obtaining a given reference current i, wherein the given reference current i is obtained by the following method:
sampling the rectified output voltage u of a wind driven generator1Obtaining the output voltage u according to the voltage-current characteristic curve of the fan, as shown in fig. 11A corresponding given reference current i;
or, collecting the AC voltage frequency f output by the wind driven generatorwAnd an output voltage u1(ii) a According to the formula w ═ fw/pNCalculating the rotational speed w of the wind turbine, where pNIs the number of magnetic pole pairs; from the speed-power characteristic curve of the generator, as shown in fig. 2, the power corresponding to the speed w of the wind turbine generator, i.e., the powerGiven a reference power p; equation of basis
Figure RE-GDA0001692521710000071
A given reference current i is calculated.
S102: according to the output current i after three-phase rectification of the wind driven generator1And given reference current i, and current formula of inductor in DC/DC converter
Figure RE-GDA0001692521710000072
Calculating the conduction time increment delta t of a switching tube in the DC/DC converter to be t-t0。
Referring to fig. 4(a) and 4(b), wherein fig. 4(a) is a schematic diagram of a step-down DC/DC converter, fig. 4(b) is a schematic diagram of a step-up DC/DC converter, and V in the diagrams represents a switching tube, in this embodiment, output power control of a wind turbine is performed by adjusting the conduction time of the switching tube V, and when the switching tube V is conducted, the current of an inductor L is increased, and the value can be according to a formula
Figure RE-GDA0001692521710000073
And (6) calculating.
In the specific calculation process, il(t)＝i*，il(t0)＝i1L is inductance, u (ξ) is the voltage across the inductor L, which is a variable that varies with time ξ, and its value is:
when the DC/DC converter is a topological structure of a boost chopper circuit, u (ξ) is equal to u1-u2And then the conduction time increment of a switching tube V in the DC/DC converter can be obtained
Figure RE-GDA0001692521710000074
When the DC/DC converter is a topology of a buck chopper circuit, u (ξ) is equal to u1And then the conduction time increment of a switching tube V in the DC/DC converter can be obtained
U above2For DC/DC conversionSampled output voltage of the device, t0The power regulation starting time is t, and the power regulation terminating time is t.
S103: obtaining an initial duty cycle D of a DC/DC converter control signal0According to the initial duty cycle D0And obtaining the adjusted control signal duty ratio D by the conduction time increment delta t;
sampling the output voltage u after three-phase rectification1I.e. sampling the voltage u at the input of the DC/DC converter1And the output terminal voltage u of the DC/DC converter2；
When the DC/DC converter is a topological structure of a boost chopper circuit, the formula is calculated
Figure RE-GDA0001692521710000081
Calculating the initial duty ratio of the control signal of the switching tube
Figure RE-GDA0001692521710000082
According to the initial duty ratio D0And the on-time increment delta t can obtain the duty ratio of the adjusted PWM control signal as follows:
Figure RE-GDA0001692521710000083
when the DC/DC converter is a topological structure of a buck chopper circuit, the formula is shown
Figure RE-GDA0001692521710000084
Calculating the initial duty ratio of the control signal of the switching tubeAccording to the initial duty ratio D0And the on-time increment delta t can obtain the duty ratio of the adjusted PWM control signal as follows:
Figure RE-GDA0001692521710000086
wherein, tonIs the on-time of the switch tube, toffFor cutting off switching tubesEnd time length tsIs the period of the control signal, and ts＝ton+toffIn PWM modulation, tsTypically a fixed known constant.
S104: and generating a corresponding PWM control signal according to the calculated duty ratio D, and inputting the PWM control signal to a control signal input end of the DC/DC converter for power tracking control.
After the duty ratio of the control signal of the DC/DC converter is calculated, a corresponding PWM control signal can be generated to carry out power tracking control.
The calculation method of the duty ratio of the control signal is given when the DC/DC converter is in a boost chopper circuit topology or a buck chopper circuit topology, and the calculated result shows that the adjusted duty ratio can be expressed as an expression of a parameter of the sampled electrical signal, such as input/output voltage or current, and a parameter of the system itself, such as inductance and a period of the pulse width modulation signal. For other topologies of the DC/DC converter, the duty ratio of the PWM control signal of the switching tube of the DC/DC converter can be calculated according to the sampled values of the detected voltage, current or power, and the system related parameters, such as the period of the inductance, capacitance and pulse width modulation signal, with reference to the above method, so as to implement power tracking.
As a preferred embodiment, the method further includes performing the correction by using a closed-loop feedback, referring to fig. 3, where the specific method of the closed-loop feedback is:
inputting the rectified electrical signal at the output end of the wind driven generator and the corresponding given reference electrical signal into a PID regulator for error regulation and outputting a closed loop correction signal; and then, the closed loop correction signal and the signal with the calculated duty ratio are superposed together, and a PWM control signal is generated and input to a control signal input end of the DC/DC converter for power tracking control. The three-phase rectified electrical signal parameter of the wind driven generator and the corresponding given reference electrical signal parameter can be the three-phase rectified output power p of the wind driven generator1And given reference power p or output current i of the wind driven generator after three-phase rectification1And given reference current i, or other parameters, etcThe given reference current i or the given reference power p may be obtained according to a voltage-current characteristic curve or a rotational speed-power curve of the fan.
The power control is carried out by adopting a mode of combining power tracking and closed loop correction, and the control precision is further improved on the basis of ensuring the control speed and efficiency.
The present invention also provides a wind power generator power tracking control apparatus 100, as shown in fig. 5, the power tracking control apparatus 100 is applied to a circuit structure in which an output of a wind power generator is rectified by three phases and then connected to a DC/DC converter, and includes:
the control unit 110 is configured to sample an output electrical signal of the wind turbine after three-phase rectification, calculate a duty ratio of a PWM control signal of the DC/DC converter according to a sampled electrical signal parameter and a system parameter, and generate the PWM control signal according to the calculated duty ratio to perform power tracking control, where the electrical signal parameter includes current, voltage, and power, and the system parameter includes a system given reference electrical signal parameter, inductance, capacitance, and resistance;
and the DC/DC converter 120 is connected to the control unit 110 and the load 200, and is configured to receive the PWM control signal generated by the control unit for performing power tracking control.
As shown in fig. 6, the control unit 110 further includes:
a current collecting unit 111 for sampling the output current i of the wind driven generator after three-phase rectification1And a given reference current i is obtained. The method for acquiring the given reference current i comprises the following steps:
sampling output voltage u of wind driven generator1Obtaining the output voltage u according to the voltage-current characteristic curve of the fan1A corresponding given reference current i;
or, collecting the AC voltage frequency f output by the wind driven generatorwAnd an output voltage u1(ii) a According to the formula w ═ fw/pNCalculating the rotational speed w of the wind turbine, where pNIs the number of magnetic pole pairs; acquiring wind power generation according to the rotating speed power characteristic curve of the generatorThe power corresponding to the rotating speed w of the machine is the given reference power P; equation of basis
Figure RE-GDA0001692521710000101
Calculating a given reference current i;
a conducting time period calculating unit 112 for calculating the output current i after three-phase rectification according to the wind driven generator1With a given reference current i, and the current formula of the inductor in the DC/DC converter
Figure RE-GDA0001692521710000102
Calculating the conduction time increment delta t of a switching tube in the DC/DC converter to be t-t0。
In the specific calculation process, il(t)＝i*，il(t0)＝i1L is inductance, u (ξ) is inductance voltage, and in the specific calculation process, i isl(t)＝i*，il(t0)＝i1L is inductance, u (ξ) is voltage across the inductor, and when the switch is turned on, the values thereof are divided into the following two cases:
when the DC/DC converter is a topological structure of a boost chopper circuit, u (ξ) is equal to u1-u2And then the conduction time increment of the switching tube in the DC/DC converter can be obtained
When the DC/DC converter is a topology of a buck chopper circuit, u (ξ) is equal to u1And then the conduction time increment of the switching tube in the DC/DC converter can be obtained
Figure RE-GDA0001692521710000104
U above2For sampling the output voltage of the DC/DC converter, t0The power regulation starting time is t, and the power regulation terminating time is t.
A duty ratio calculation unit 113 for obtaining an initial duty ratio D of the DC/DC converter control signal0According to the initial duty cycle D0And the conduction time increment delta t is adjustedThe duty cycle D of the control signal.
Sampling DC/DC converter input terminal voltage u1And the output terminal voltage u2；
When the DC/DC converter is a topological structure of a boost chopper circuit, the formula is calculated
Figure RE-GDA0001692521710000111
Calculating the initial duty ratio of the control signal of the switching tube
Figure RE-GDA0001692521710000112
According to the initial duty ratio D0And the on-time increment delta t can obtain the duty ratio of the adjusted PWM control signal as follows:
when the DC/DC converter is a topological structure of a buck chopper circuit, the formula is shown
Figure RE-GDA0001692521710000114
Calculating the initial duty ratio of the control signal of the switching tubeAccording to the initial duty ratio D0And the on-time increment delta t can obtain the duty ratio of the adjusted PWM control signal as follows:
Figure RE-GDA0001692521710000116
wherein, tonIs the on-time of the switch tube, toffFor the cut-off duration of the switching tube, tsIs the period of the control signal, and ts＝ton+toffIn PWM modulation, tsTypically a fixed known constant.
And a PWM control unit 114, configured to generate a PWM control signal according to the calculated duty ratio D, and input the PWM control signal to a control signal input end of the DC/DC converter for power tracking control.
In a preferred embodiment, the wind turbine power tracking control apparatus of the present invention further includes:
and the PID regulator 115 is used for receiving the output electric signal of the wind driven generator after three-phase rectification and a given reference electric signal, and outputting a closed-loop correction signal after PID error regulation.
The output electric signal parameter of the wind driven generator after three-phase rectification and the corresponding given reference electric signal parameter can be the output end power p of the wind driven generator after three-phase rectification1And given reference power p or output current i of the wind driven generator after three-phase rectification1And a given reference current i or a given reference power p, which may be obtained from the voltage-current characteristic curve or the speed-power curve of the aforementioned fan, or other parameters, etc.
A superimposing unit 116, configured to superimpose the closed-loop correction signal and the signal with the duty ratio calculated by the duty ratio calculating unit and input the superimposed signal to the PWM control unit;
the PWM control unit 114 is further configured to generate a PWM control signal according to the superimposed signal, and input the PWM control signal to a control signal input terminal of the DC/DC converter for power tracking control.
The accuracy of power tracking can be further improved by using a PID regulator for feedback regulation.
The technical scheme of the invention tracks and regulates the output power of the wind driven generator according to the sampled electric signal parameters and the system parameters, does not directly use PID feedback regulation, and has higher control efficiency and control precision.
In addition, in order to further improve the regulation precision, the invention also provides a power tracking control method added with closed-loop correction, PID feedback control is adopted in the closed-loop correction scheme for fine adjustment, because the method for carrying out power tracking control according to the system parameters adopted by the invention can ensure the power control speed, the PID feedback is only carried out with fine adjustment correction, the adjustment amplitude is smaller, compared with the traditional PID feedback regulation, the control speed is also improved to a certain extent, and on the other hand, the control precision can also be improved, therefore, the scheme of the invention can further improve the regulation precision on the premise of ensuring the regulation speed, namely, the respective advantages of carrying out power tracking control and PID closed-loop feedback according to the system parameters are well combined, and the system has more excellent power tracking control performance.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (9)

1. A wind power generator power tracking control method is applied to a circuit structure that the output of a wind power generator is connected with a DC/DC converter after three-phase rectification, and is characterized in that the method comprises the following steps:
a. sampling output current i of wind driven generator after three-phase rectification1And obtaining a given reference current i*；
b. According to the sampled current i1With a given reference current i*And current formula of inductor in DC/DC converter
Figure FDA0001612648270000011
Calculating the conduction time increment delta t of a switching tube in the DC/DC converter to be t-t0Wherein i isl(t) is the current in the inductor at the end of the power regulation, the value of which is equal to i*；il(t0) For power regulation of the value of the current in the inductor at the start of the power regulation, the value of which is equal to i1L is the inductance, u (ξ) is the voltage across the inductance, which is a variable that varies with time ξ, t0The power regulation starting time is t, and the power regulation terminating time is t;
c. obtaining an initial duty cycle D of a DC/DC converter control signal0According to the initial duty cycle D0And obtaining the adjusted control signal duty ratio D by the conduction time increment delta t;
d. and generating a corresponding PWM control signal according to the calculated duty ratio D, and inputting the PWM control signal to a control signal input end of the DC/DC converter for power tracking control.
2. The method for controlling power tracking of wind turbine generator as claimed in claim 1, wherein said step a is performed by obtaining a given reference current i*The specific method comprises the following steps:
sampling output voltage u of wind driven generator after three-phase rectification1Obtaining the output voltage u according to the voltage-current characteristic curve of the fan1Corresponding given reference current i*。
3. The method for controlling power tracking of wind turbine generator as claimed in claim 1, wherein said step a is performed by obtaining a given reference current i*The specific method comprises the following steps:
collecting AC voltage frequency f output by wind driven generatorwAnd the output voltage u after three-phase rectification1(ii) a According to the formula w ═ fw/pNCalculating the rotational speed w of the wind turbine, where pNIs the number of magnetic pole pairs; according to the rotating speed power characteristic curve of the generator, obtaining the power corresponding to the rotating speed w of the wind driven generator, namely the given reference power p*(ii) a Equation of basis
Figure FDA0001612648270000012
Calculating a given reference current i*。
4. Wind turbine power tracking control method according to claim 1, characterized in that in step c an initial duty cycle D of the DC/DC converter control signal is obtained0The specific method comprises the following steps:
collecting output voltage u after three-phase rectification1And the output terminal voltage u of the DC/DC converter2(ii) a When the DC/DC converter is a topological structure of a boost chopper circuit, the formula is calculated
Figure FDA0001612648270000021
Calculating the initial duty ratio of the control signal of the switching tubeWhen the DC/DC converter is a topological structure of a buck chopper circuit, the formula is shownCalculating the initial duty ratio of the control signal of the switching tube
Figure FDA0001612648270000024
Wherein, tonIs the on-time of the switch tube, toffFor the cut-off duration of the switching tube, tsIs the period of the control signal, and ts＝ton+toff。
5. The method for controlling the power tracking of the wind turbine generator according to any one of claims 1 to 4, further comprising a modification by means of a closed-loop feedback, wherein the closed-loop feedback is implemented by:
inputting the output electric signal parameters of the wind driven generator after three-phase rectification and the given reference electric signal parameters into a PID regulator for PID error regulation and outputting closed loop correction signals; and c, superposing the closed loop correction signal and the signal with the duty ratio calculated in the step c, generating a PWM control signal, and inputting the PWM control signal to a control signal input end of the DC/DC converter for power tracking control.
6. The method as claimed in claim 5, characterized in that the three-phase rectified output electrical signal parameter and the given reference electrical signal parameter are three-phase rectified output currents i1And a given reference current i*。
7. The method as claimed in claim 5, characterized in that the three-phase rectified output electrical signal parameter and the given reference electrical signal parameter are three-phase rectified output powerp1And given reference power p*。
8. A wind power generator power tracking control device is applied to a circuit structure that the output of a wind power generator is connected with a DC/DC converter after three-phase rectification, and the power tracking control device comprises:
the current acquisition unit is used for sampling the output current i of the wind driven generator after three-phase rectification1And obtaining a given reference current i*；
A conduction time period calculation unit for calculating the conduction time period according to the sampled current i1With a given reference current i*And current formula of inductor in DC/DC converter
Figure FDA0001612648270000031
Calculating the conduction time increment delta t of a switching tube in the DC/DC converter to be t-t0Wherein i isl(t) is the current in the inductor at the end of the power regulation, the value of which is equal to i*；il(t0) For power regulation of the value of the current in the inductor at the start of the power regulation, the value of which is equal to i1L is inductance, u (ξ) is voltage across the inductance, t0The power regulation starting time is t, and the power regulation terminating time is t;
a duty ratio calculation unit for obtaining an initial duty ratio D of the DC/DC converter control signal0According to the initial duty cycle D0And obtaining the adjusted control signal duty ratio D by the conduction time increment delta t;
the PWM control unit is used for generating a PWM control signal according to the calculated duty ratio D and inputting the PWM control signal to a control signal input end of the DC/DC converter for power tracking control;
and the DC/DC converter is connected with the PWM control unit and is used for receiving the PWM control signal generated by the PWM control unit to carry out power tracking control.
9. The wind turbine power tracking control device according to claim 8, further comprising:
a PID regulator: the system is used for receiving the output electric signal parameters of the wind driven generator after three-phase rectification and given reference electric signal parameters, and outputting closed-loop correction signals after PID error adjustment;
the superposition unit is used for superposing the closed-loop correction signal and the signal of which the duty ratio is calculated by the duty ratio calculation unit and inputting the superposed signals into the PWM control unit;
and the PWM control unit is also used for generating a PWM control signal according to the superposed signal and inputting the PWM control signal to a control signal input end of the DC/DC converter for power tracking control.
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