CN114673629B - Maximum power tracking method and system for tandem type double-wind-wheel wind turbine generator set - Google Patents

Maximum power tracking method and system for tandem type double-wind-wheel wind turbine generator set Download PDF

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CN114673629B
CN114673629B CN202210462523.2A CN202210462523A CN114673629B CN 114673629 B CN114673629 B CN 114673629B CN 202210462523 A CN202210462523 A CN 202210462523A CN 114673629 B CN114673629 B CN 114673629B
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wind
double
wheels
wind wheels
power
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CN114673629A (en
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李铮
郭小江
付明志
秦猛
李春华
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Huaneng Clean Energy Research Institute
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Huaneng Clean Energy Research Institute
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D7/00—Controlling wind motors 
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2270/00—Control
    • F05B2270/10—Purpose of the control system
    • F05B2270/103—Purpose of the control system to affect the output of the engine
    • F05B2270/1033—Power (if explicitly mentioned)
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2270/00—Control
    • F05B2270/30—Control parameters, e.g. input parameters
    • F05B2270/32—Wind speeds
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/72—Wind turbines with rotation axis in wind direction

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  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Eletrric Generators (AREA)
  • Wind Motors (AREA)

Abstract

The invention belongs to the technical field of wind power control, and discloses a maximum power tracking method and a maximum power tracking system for a tandem type double-wind-wheel wind power generator set, which are used for detecting wind speed; if the wind speed changes, the torque coordinates of the front and rear wind wheels corresponding to the stable state are taken as a reference, the torque coordinates (T10, T20) of the front and rear wind wheels corresponding to the operation stable state before the wind speed changes are taken as a reference, and the delta T is taken as a step length for a plurality of times of calculation until the absolute value of the difference between the output power value P of the wind turbine generator measured in the trial and the output power value obtained in the last calculation is less than or equal to a threshold value epsilon, so that the maximum power of the tandem double wind wheels is monitored by the method for finishing the calculation, the accuracy is high, the error is small, the maximum power point in the true sense is reached, and the operation efficiency of the wind turbine generator is improved.

Description

Maximum power tracking method and system for tandem type double-wind-wheel wind turbine generator set
Technical Field
The invention belongs to the technical field of wind power control, and particularly relates to a maximum power tracking method and system for a tandem type double-wind-wheel wind power generator set.
Background
For a direct-drive fan or a semi-direct-drive tandem type double-wind-wheel wind turbine generator, in a working interval that the inflow wind speed of the wind turbine generator is higher than the cut-in wind speed and the rotating speed of the motor is lower than the rated rotating speed, the working interval is generally called as a maximum wind energy tracking area, the pitch angle of a wind wheel is controlled to be constant at 0 degree at the moment, the output force of the wind turbine generator is adjusted only by adjusting the converters of a front wind wheel and a rear wind wheel, the electromagnetic torque generated by the motor is changed, and therefore the rotating speed of a front wind wheel generator and a rear wind wheel generator is controlled. In this working interval, at each inflow wind speed, a group of specific electromagnetic torque combinations of the front wind wheel and the rear wind wheel exist, and the electromagnetic torque combinations correspond to a group of specific rotation speed combinations of the front wind wheel and the rear wind wheel, so that the sum of the output powers of the front wind wheel and the rear wind wheel reaches the maximum, namely the maximum power at the inflow wind speed.
In the maximum power tracking method of the wind turbine generator with the single wind wheel, two methods are commonly used, namely, a rotating speed-torque corresponding table completed in the design stage of the wind turbine generator directly determines an electromagnetic torque reference value which is required to be reached at the wind speed through direct one-to-one correspondence; and secondly, the peak value of power output is found by continuously changing the electromagnetic torque forwards and backwards and monitoring the change of the output power, namely the maximum power point is sought by a so-called hill climbing method. All maximum power tracking methods for the single-wind-wheel wind turbine cannot be directly applied to the tandem double-wind-wheel wind turbine.
For the tandem type double-wind-wheel wind turbine generator, because no actual generator set is put into production at home at present, the existing technical scheme mainly adopts a rotating speed-torque corresponding table, namely the electromagnetic torque reference values corresponding to the front wind wheel and the rear wind wheel are obtained through table lookup and input into a converter control system through the current rotating speed of the front wind wheel and the rear wind wheel so as to complete the tracking of the maximum power point of the tandem type double-wind-wheel wind turbine generator. The maximum power tracking method for the rotating speed-torque corresponding table of the tandem type double-wind-wheel wind turbine generator set has the advantages that the accuracy is low because the rotating speed-torque corresponding table is derived from a pneumatic theoretical model or is inferred from actual operation data, the table guides the actual operation of the tandem type double-wind-wheel wind turbine generator set, the error is large, the maximum power point in the true sense cannot be achieved, and the operation efficiency of the generator set is reduced.
For a tandem wind turbine generator, the wind speed change is generally slower in a wide flat ground or sea area due to the lack of obstacles around the wind turbine generator. In this scenario, although each wind speed change has enough time for the control system to adjust, the main requirement of the tandem type double-wind-wheel wind turbine generator after the wind speed change is the adjustment accuracy, but an effective monitoring method which needs to maintain the wind turbine generator at the maximum power point and has no static error is not available in the prior art.
Disclosure of Invention
The invention aims to provide a maximum power tracking method and a maximum power tracking system for a tandem type double-wind-wheel wind turbine generator set, which aim to solve the problems in the prior art:
in order to achieve the purpose, the invention provides the following technical scheme:
a maximum power tracking method of a tandem type double-wind-wheel wind turbine generator set comprises the following steps of:
if the wind speed does not change, the tandem double wind wheels are in a steady state;
if the wind speed changes, recording the total output power P0 of the double wind wheels before and after the double wind wheels are in a stable state and the torques T10 and T20 of the double wind wheels by taking the torque coordinates of the front and rear wind wheels corresponding to the stable state as a reference; according to the recorded output total power P0 and the torques T10 and T20 of the double wind wheels, the recorded output total power P0 and the torques T10 and T20 of the double wind wheels are used as torque reference values of a motor converter torque ring in the double wind wheels of the wind turbine generator set, according to the recorded output total power P0 before and after the double wind wheels are in a stable state and the torques T10 and T20 of the double wind wheels, an initial angle theta =0 of a gradient climbing initial point of the double wind wheels is enabled, new torques T1 and T2 of the double wind wheels are modified, the output total power P of the double wind wheels at the initial angle theta =0 is measured, and an array (T1, T2, P) is correspondingly stored;
after an initial angle theta of an initial point of the gradient climbing of the double wind wheels is increased by an angle step delta theta, judging the angle of the initial angle theta, and if the angle of the initial angle theta is smaller than 360 degrees, repeating the operation of measuring the total output power P of the double wind wheels of the wind turbine generator set at the initial angle theta =0 and corresponding storage arrays (T1, T2, P); if the angle of the initial angle theta is greater than or equal to 360 degrees, searching operation of the maximum value of the output total power Pmax is carried out, and the searched maximum value of the output total power Pmax is compared with P0; if the difference value between the maximum value of the output total power P and P0 is smaller than or equal to a threshold value epsilon, the operation is finished, the torque loop torque reference values of the front wind wheel motor converter and the rear wind wheel motor converter are respectively set as T1 and T2, the system enters a new operation steady state, and the maximum power tracking of the tandem double wind wheels is completed; and if the difference value between the maximum value of the output total power P and the P0 is greater than the threshold value epsilon, assigning the value of T1 corresponding to the maximum value of the total power P to T10, assigning the value of T2 corresponding to the maximum value of the total power P to T20, assigning the maximum value of the total power P to P0, namely generating new (T10, T20 and P0), and resetting and calculating the initial angle theta value of the gradient climbing initial point of the double-wind wheel.
Further, the new torques T1 and T2 of the double wind wheel are modified by: establishing two-dimensional rectangular coordinates (T10 and T20) as a reference point according to the position of the initial angle theta =0 of the initial gradient climbing point of the double wind wheels, wherein the initial angle theta is the direction, so that T1= T10+ delta T × cos theta and T2= T20+ delta T × sin theta are obtained, and the obtained T1 and T2 are used as converter torque reference values of the double wind wheels; where Δ T is the torque gradient step.
Further, the method for retrieving the maximum value P is as follows: comparisons are made with each other in all arrays (T1, T2, P).
Further, the method for selecting step length of Δ T as torque gradient comprises: Δ T =0 to 1 × (T10 + T20).
Further, the selection range of the angle step delta theta is 0-10 degrees.
Further, the threshold value epsilon is an error allowable range of a gap value between P and P0, and the magnitude of the threshold value epsilon is: ε =0 to 1 XP 0.
Further, a difference value between the maximum value of the total output power P and P0 is an absolute value obtained by subtracting the maximum value of the total output power P from P0.
A maximum power tracking system of a tandem type double-wind-wheel wind turbine generator set comprises:
the detection module is used for detecting the wind speed;
the judging module is used for detecting the change of the wind speed, and if the wind speed does not change, the tandem double wind wheels are in a steady state;
if the wind speed changes, recording the total output power P0 of the double wind wheels before and after the double wind wheels are in a stable state and the torques T10 and T20 of the double wind wheels by taking the torque coordinates of the front and rear wind wheels corresponding to the stable state as a reference; calculating a torque reference value of a motor converter torque loop in the double wind wheels of the wind generating set according to the recorded output total power P0 and the torques T10 and T20 of the double wind wheels, enabling an initial angle theta =0 of a gradient climbing initial point of the double wind wheels according to the recorded output total power P0 before and after the double wind wheels are in a steady state and the torques T10 and T20 of the double wind wheels, modifying new torques T1 and T2 of the double wind wheels, measuring the output total power P of the double wind wheels at the initial angle theta =0, and correspondingly storing an array (T1, T2, P);
after increasing an angle step length delta theta to an initial angle theta of a gradient climbing initial point of the double wind wheels, judging the angle of the initial angle theta, and if the angle of the initial angle theta is smaller than 360 degrees, repeating the operation of measuring the total output power P of the double wind wheels of the wind turbine generator set at the initial angle theta =0 and corresponding storage arrays (T1, T2, P); if the angle of the initial angle theta is greater than or equal to 360 degrees, searching operation of the maximum value of the output total power Pmax is carried out, and the searched maximum value of the output total power Pmax is compared with P0; if the difference value between the maximum value of the output total power P and P0 is smaller than or equal to a threshold value epsilon, the operation is finished, the torque loop torque reference values of the front wind wheel motor converter and the rear wind wheel motor converter are respectively set as T10 and T20, the system enters a new operation steady state, and the maximum power tracking of the tandem double wind wheels is completed; and if the difference value between the maximum value of the output total power P and P0 is greater than the threshold value epsilon, resetting the initial angle theta value of the gradient climbing initial point of the double wind wheels and calculating.
Compared with the prior art, the invention has the advantages that:
the maximum power tracking method of the tandem type double-wind-wheel wind turbine generator set is used for controlling the output power of the front wind wheel wind turbine generator set and the rear wind wheel wind turbine generator set to reach the maximum value by generating the electromagnetic torque reference value in the converter control system of the front wind turbine generator set and the rear wind turbine generator set for different inflow wind speeds when the set operates in the maximum wind energy tracking area, so that the sum of the output power of the front wind wheel wind turbine generator set and the output power of the rear wind wheel wind turbine generator set reaches the maximum value, the maximum power tracking under the current inflow wind speed is completed, the accuracy is high, the error is small, the maximum power point in the true sense is reached, and the operation efficiency of the set is improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic flow chart of a maximum power tracking method for a tandem double-wind-wheel wind turbine generator set according to the present invention;
FIG. 2 is a schematic diagram illustrating an effect of a maximum power tracking method of a tandem double-wind-wheel wind turbine generator set according to the present invention;
FIG. 3 is a schematic diagram of input and output connections of a maximum power tracking method system of a tandem double-wind-wheel wind turbine generator set according to the maximum power tracking method of the invention;
Detailed Description
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
The following detailed description is exemplary in nature and is intended to provide further explanation of the invention as claimed. Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention.
The tandem type double-wind wheel wind turbine generator set comprises: on the basis of a traditional wind driven generator, a rotary wind wheel is additionally arranged on the opposite side of the back face of a wind turbine generator and used for absorbing residual wind energy after wind power passes through a front wind wheel.
Wind energy utilization coefficient: the degree to which a wind turbine extracts energy from natural wind energy represents the efficiency of a wind generator in converting wind energy into electrical energy, denoted Cp. The specific calculation mode is the ratio of the shaft power on the main shaft of the wind wheel to the natural wind power obtained on the swept area of the wind wheel. In practical engineering, the total electric power output by the motor is usually used instead due to inaccurate shaft power measurement on the main shaft.
A front wind wheel: the wind wheels facing the inflow wind at the front side in the tandem type double-wind-wheel wind turbine generator set are firstly arranged.
A rear wind wheel: and the wind wheels except the front wind wheel in the tandem type double-wind-wheel wind turbine generator set.
Further, the double wind wheels are connected in series to the wind turbine generator.
Further, the torque value of the double wind wheels is obtained by measuring a torque reference value of the wind turbine generator side converter.
The maximum power tracking method of the tandem type double-wind-wheel wind turbine generator set detects the wind speed; if the wind speed changes, the torque coordinates of the front and rear wind wheels corresponding to the stable state are taken as a reference, the torque coordinates (T10, T20) of the front and rear wind wheels corresponding to the operation stable state before the wind speed changes are taken as a reference, and the delta T is taken as a step length for a plurality of times of calculation until the absolute value of the difference between the output power value P of the wind turbine generator measured in the trial and the output power value obtained in the last calculation is less than or equal to a threshold value epsilon, so that the maximum power of the tandem double wind wheels is monitored by the method for finishing the calculation, the accuracy is high, the error is small, the maximum power point in the true sense is reached, and the operation efficiency of the wind turbine generator is improved.
As shown in fig. 1, the maximum power tracking method of the tandem double-wind-wheel wind turbine generator set according to the present invention includes: detecting the wind speed;
if the wind speed does not change, the tandem double wind wheels are in a steady state;
if the wind speed changes, recording the total output power P0 of the double wind wheels before and after the double wind wheels are in a stable state and the torques T10 and T20 of the double wind wheels by taking the torque coordinates of the front and rear wind wheels corresponding to the stable state as a reference; according to the recorded output total power P0 and the torques T10 and T20 of the double wind wheels, the recorded output total power P0 and the torques T10 and T20 of the double wind wheels are used as torque reference values of a motor converter torque loop in the double wind wheels of the wind turbine generator, according to the recorded output total power P0 before and after the double wind wheels are in a steady state and the torques T10 and T20 of the double wind wheels, an initial angle theta =0 of a gradient climbing initial point of the double wind wheels is enabled, new torques T1 and T2 of the double wind wheels are modified, the output total power P of the double wind wheels at the initial angle theta =0 is measured, and an array (T1, T2 and P) is correspondingly stored;
after an initial angle theta of an initial point of the gradient climbing of the double wind wheels is increased by an angle step delta theta, judging the angle of the initial angle theta, and if the angle of the initial angle theta is smaller than 360 degrees, repeating the operation of measuring the total output power P of the double wind wheels of the wind turbine generator set at the initial angle theta =0 and corresponding storage arrays (T1, T2, P); if the initial angle theta is larger than or equal to 360 degrees, searching operation of the maximum value of the total output power Pmax is carried out, and the searched maximum value of the total output power Pmax is compared with P0; if the difference value between the maximum value of the output total power P and P0 is smaller than or equal to a threshold value epsilon, the operation is finished, the torque loop torque reference values of the front wind wheel motor converter and the rear wind wheel motor converter are respectively set as T1 and T2, the system enters a new operation steady state, and the maximum power tracking of the tandem double wind wheels is completed; and if the difference value between the maximum value of the output total power P and the P0 is greater than the threshold value epsilon, assigning the value of T1 corresponding to the maximum value of the total power P to T10, assigning the value of T2 corresponding to the maximum value of the total power P to T20, assigning the maximum value of the total power P to P0, namely generating new (T10, T20 and P0), resetting the initial angle theta value of the gradient climbing initial point of the double-wind wheel and calculating.
Wherein: the double wind wheels in the stable state are the double wind wheels in the previous stable state, and when the wind turbine generator set runs, the double wind wheels of the wind turbine generator set can generate a plurality of stable states due to different wind speeds.
More specifically, when the double-wind-wheel wind turbine generator set is in the last steady state of operation, if the wind speed is unchanged, the rotating speed and the torque of the front wind wheel and the rear wind wheel are not changed, and if the rotating speed of the wind wheels fluctuates due to the change of the wind speed, the recording operation is performed.
When the recording operation is carried out, the total output power P0 of the front wind wheel and the rear wind wheel at the time is recorded, and the current torques T10 and T20 of the front wind wheel and the rear wind wheel (generally, the reference value of the torque of the converter at the measuring machine side is replaced by the reference value) are recorded, so that the calculation operation is carried out.
When calculating, firstly making the gradient direction theta 0 degree; the values of T1 and T2 are modified according to the current gradient direction in such a way that T1= T10 +. DELTA.T × cos θ, T2= T20 +. DELTA.T × sin θ, according to the current two-dimensional rectangular coordinates (T10, T20) as reference point and θ as direction. And inputting the T1 and the T2 as converter torque reference values of the front wind wheel and the rear wind wheel. Wherein, delta T is the torque gradient step length; and measuring the total power P output by the front wind wheel and the rear wind wheel at the moment, and storing the arrays (T1, T2, P). Increasing theta by an angle step delta theta, and if not exceeding 360 degrees, repeating the step 4; if greater than or equal to 360, a comparison operation is performed.
When the comparison operation is performed, the array corresponding to the largest P among all the T1, T2, and P arrays is searched, and T10= T1 and T20= T2. If the absolute value of the difference between P and P0 is smaller than or equal to a threshold value epsilon, the operation is finished, the torque loop torque reference values of the front wind turbine motor converter and the rear wind turbine motor converter are respectively set as T10 and T20, and the system enters a new operation steady state; otherwise, let P0= P, repeat the calculation operation.
Further, the method for calculating the new torque reference value of the motor converter torque ring in the double wind wheels of the wind turbine generator set comprises the following steps: according to the recorded output total power P0 of the double wind wheels before and after the double wind wheels are in a steady state and the torques T10 and T20 of the double wind wheels, enabling the initial angle theta =0 of the gradient climbing initial point of the double wind wheels, modifying new torques T1 and T2 of the double wind wheels, measuring the output total power P of the double wind wheels at the initial angle theta =0, and correspondingly storing an array (T1, T2, P); increasing an angle step delta theta of an initial angle theta of a gradient climbing initial point of the double wind wheels, judging the angle of the theta, and repeating the operation of measuring the total output power P of the double wind wheels of the wind turbine generator set at the initial angle theta =0 and corresponding storage arrays (T1, T2, P) if the angle of the theta is smaller than 360 degrees; if the angle theta is greater than or equal to 360 degrees, searching operation of the maximum value of the output total power Pmax is carried out, the searched maximum value of the output total power Pmax is compared with P0, if the difference value between the maximum value of the output total power Pmax and the P0 is less than or equal to a threshold value epsilon, the operation is finished, the torque ring reference values of the front wind wheel motor converter and the rear wind wheel motor converter are respectively T10 and T20, and the system enters a new operation steady state; and if the difference value between the maximum value of the output total power P and P0 is greater than the threshold value epsilon, resetting the initial angle theta value of the gradient climbing initial point of the double wind wheels and calculating.
More specifically, as shown in fig. 2, the gradient direction of the initial gradient climbing point of the dual wind turbine is the direction in which θ is located, that is, in a two-dimensional coordinate system of T1 and T2, an arbitrary point seat is determined as the initial point, the size of the initial point is the angle value of arctan ((T2-T20)/(T1-T10)), and based on this, an angle step Δ θ is continuously and cyclically increased, and the value of the angle step Δ θ increased in the gradient direction θ is compared with 360 °, and in a space of one circle in the horizontal direction in which the wind turbine is located, the next steady-state traveling direction of the wind turbine is determined according to the comparison result.
Specifically, the method for retrieving the maximum value P is: comparisons are made with each other in all arrays (T1, T2, P).
Specifically, the threshold value epsilon refers to an error allowable range of a gap value between P and P0, and the size of the threshold value epsilon is: epsilon =0 to 10 × P0, preferably epsilon =0.01 × P0.
Further, the method for modifying the new torques T1 and T2 of the double wind wheels is as follows: establishing two-dimensional rectangular coordinates (T10, T20) as reference points according to the position of the initial angle theta =0 of the initial gradient climbing point of the double wind wheels, wherein the initial angle theta is the direction, so that T1= T10+ delta T multiplied by cos theta, T2= T20+ delta T multiplied by sin theta, and the calculated T1 and T2 are used as converter torque reference values of the double wind wheels; where Δ T is the torque gradient step.
Specifically, the method for selecting the step length of the torque gradient as delta T comprises the following steps: Δ T =0 to 1 × (T10 + T20), preferably Δ T =0.02 to 0.05 × (T10 + T20).
In particular, the angular step Δ θ is generally selected in the range of 0 ° to 10 °, preferably 1 ° to 3 °.
Specifically, the difference value between the maximum value of the total output power pmax and P0 is an absolute value obtained by subtracting the maximum value of the total output power pmax from P0.
Further, as shown in fig. 2, it is a schematic diagram of an effect of a maximum power tracking method of a tandem double-wind-wheel wind turbine generator system according to the present invention. From the initial point of gradient ramp-up, the ramp is ramped up to the next point through a number of cycles of the calculation and comparison steps in the above method. The correlation operation is continued for several times, and three times of operations are performed as in the present embodiment, which is explained as an example. And reaching the final gradient climbing point, namely obtaining the torque reference values of the front wind wheel motor converter and the rear wind wheel motor converter corresponding to the new maximum power point of the tandem double wind wheel unit.
Specifically, as shown in fig. 3, it is a schematic diagram of system input and output connections of a maximum power tracking method of a tandem double-wind-wheel wind turbine generator system according to the present invention. The maximum power tracking method and system of the tandem type double-wind-wheel wind turbine generator set comprise 3 inputs and 1 output. The input 1 is the rotating speed of the current front and rear wind wheels; the input 2 is the total output power of the current front and rear wind wheels; and inputting the torque reference values of the current front wind turbine motor converter and the current rear wind turbine motor converter of 3 bits. The output is the new torque reference value of the front and rear wind turbine motor converter torque ring calculated by the process of figure 1.
Further specifically, under any one steady state operation of the double-wind wheel fan, the fan keeps the rotating speed and the torque of the front wind wheel and the rear wind wheel unchanged, and the fan is kept to operate stably under the steady state; if the external wind speed changes at a certain moment, starting to track the maximum power of the tandem type double-wind-wheel wind turbine generator set; the maximum power tracking method of the tandem type double-wind-wheel wind turbine generator set is used for controlling the output power of the front wind wheel wind turbine generator set and the rear wind wheel wind turbine generator set to reach the maximum value by generating the electromagnetic torque reference value of the converter control system of the front wind turbine generator set and the rear wind turbine generator set for different inflow wind speeds when the set runs in the maximum wind energy tracking area, so that the sum of the output power of the front wind wheel wind turbine generator set and the output power of the rear wind wheel wind turbine generator set is the maximum value, the maximum power tracking under the current inflow wind speed is completed, the accuracy is high, the error is small, the maximum power point in the true sense is reached, and the running efficiency of the set is improved.
Example 2:
a maximum power tracking system of a tandem double-wind-wheel wind turbine generator set comprises:
the detection module is used for detecting the wind speed;
the judging module is used for detecting the change of the wind speed, and if the wind speed does not change, the tandem double wind wheels are in a steady state;
if the wind speed changes, recording the total output power P0 of the double wind wheels before and after the double wind wheels are in a stable state and the torques T10 and T20 of the double wind wheels by taking the torque coordinates of the front and rear wind wheels corresponding to the stable state as a reference; calculating a torque reference value of a motor converter torque loop in the double wind wheels of the wind generating set according to the recorded output total power P0 and the torques T10 and T20 of the double wind wheels, enabling an initial angle theta =0 of a gradient climbing initial point of the double wind wheels according to the recorded output total power P0 before and after the double wind wheels are in a steady state and the torques T10 and T20 of the double wind wheels, modifying new torques T1 and T2 of the double wind wheels, measuring the output total power P of the double wind wheels at the initial angle theta =0, and correspondingly storing an array (T1, T2, P);
after an initial angle theta of an initial point of the gradient climbing of the double wind wheels is increased by an angle step delta theta, judging the angle of the initial angle theta, and if the angle of the initial angle theta is smaller than 360 degrees, repeating the operation of measuring the total output power P of the double wind wheels of the wind turbine generator set at the initial angle theta =0 and corresponding storage arrays (T1, T2, P); if the angle of the initial angle theta is greater than or equal to 360 degrees, searching operation of the maximum value of the output total power Pmax is carried out, and the searched maximum value of the output total power Pmax is compared with P0; if the difference value between the maximum value of the output total power P and P0 is smaller than or equal to a threshold value epsilon, the operation is finished, the torque loop torque reference values of the front wind wheel motor converter and the rear wind wheel motor converter are respectively set as T10 and T20, the system enters a new operation steady state, and the maximum power tracking of the tandem double wind wheels is completed; if the difference value between the maximum value of the output total power P and P0 is larger than the threshold value epsilon, resetting the initial angle theta value of the initial gradient climbing point of the double wind wheels and calculating.
It will be appreciated by those skilled in the art that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The embodiments disclosed above are therefore to be considered in all respects as illustrative and not restrictive. All changes which come within the scope of or equivalence to the invention are intended to be embraced therein.
Finally, it should be noted that: although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.

Claims (8)

1. A maximum power tracking method of a tandem type double-wind-wheel wind turbine generator set is characterized by comprising the following steps:
detecting the wind speed;
if the wind speed does not change, the tandem double wind wheels are in a steady state;
if the wind speed changes, recording the total output power P0 of the double wind wheels before and after the double wind wheels are in a stable state and the torques T10 and T20 of the double wind wheels by taking the torque coordinates of the front and rear wind wheels corresponding to the stable state as a reference; according to the recorded output total power P0 and the torques T10 and T20 of the double wind wheels, the recorded output total power P0 and the torques T10 and T20 of the double wind wheels are used as torque reference values of a motor converter torque loop in the double wind wheels of the wind turbine generator, according to the recorded output total power P0 before and after the double wind wheels are in a steady state and the torques T10 and T20 of the double wind wheels, an initial angle theta =0 of a gradient climbing initial point of the double wind wheels is enabled, new torques T1 and T2 of the double wind wheels are modified, the output total power P of the double wind wheels at the initial angle theta =0 is measured, and an array (T1, T2 and P) is correspondingly stored;
after an initial angle theta of an initial point of the gradient climbing of the double wind wheels is increased by an angle step delta theta, judging the angle of the initial angle theta, and if the angle of the initial angle theta is smaller than 360 degrees, repeating the operation of measuring the total output power P of the double wind wheels of the wind turbine generator set at the initial angle theta =0 and corresponding storage arrays (T1, T2, P); if the angle of the initial angle theta is greater than or equal to 360 degrees, searching operation of the maximum value of the output total power Pmax is carried out, and the searched maximum value of the output total power Pmax is compared with P0; if the difference value between the maximum value of the output total power P and P0 is smaller than or equal to a threshold value epsilon, the operation is finished, the torque loop torque reference values of the front wind wheel motor converter and the rear wind wheel motor converter are respectively set as T1 and T2, the system enters a new operation steady state, and the maximum power tracking of the tandem double wind wheels is completed; and if the difference value between the maximum value of the output total power P and the P0 is greater than the threshold value epsilon, assigning the value of T1 corresponding to the maximum value of the total power P to T10, assigning the value of T2 corresponding to the maximum value of the total power P to T20, assigning the maximum value of the total power P to P0, namely generating new (T10, T20 and P0), and resetting and calculating the initial angle theta value of the gradient climbing initial point of the double-wind wheel.
2. The maximum power tracking method of the tandem double-wind-wheel wind power generation unit according to claim 1, wherein the new torques T1 and T2 of the double wind wheels are modified by: establishing two-dimensional rectangular coordinates (T10 and T20) as a reference point according to the position of the initial angle theta =0 of the initial gradient climbing point of the double wind wheels, wherein the initial angle theta is the direction, so that T1= T10+ delta T × cos theta and T2= T20+ delta T × sin theta are obtained, and the obtained T1 and T2 are used as converter torque reference values of the double wind wheels; where Δ T is the torque gradient step.
3. The method for tracking the maximum power of the tandem type double-wind-wheel wind turbine generator set according to claim 1, wherein the method for retrieving the maximum value P is as follows: comparisons are made with each other in all arrays (T1, T2, P).
4. The method for tracking the maximum power of the tandem type double-wind-wheel wind turbine generator set according to claim 2, wherein the step length of Δ T is selected by the following steps: Δ T =0 to 1 × (T10 + T20).
5. The method for tracking the maximum power of a tandem wind turbine generator system according to claim 1, wherein the angular step Δ θ is selected in a range of 0 ° to 10 °.
6. The method according to claim 1, wherein the threshold value epsilon is an allowable error range of a difference value between P and P0, and the threshold value epsilon is: ε =0 to 1 XP 0.
7. The method according to claim 1, wherein a difference value between the pmax of the total output power and P0 is an absolute value obtained by subtracting the pmax of the total output power from P0.
8. A maximum power tracking system of a tandem type double-wind-wheel wind turbine generator set is characterized by comprising:
the detection module is used for detecting the wind speed;
the judging module is used for detecting the change of the wind speed, and if the wind speed does not change, the tandem double wind wheels are in a steady state;
if the wind speed changes, recording the total output power P0 of the double wind wheels before and after the double wind wheels are in a stable state and the torques T10 and T20 of the double wind wheels by taking the torque coordinates of the front and rear wind wheels corresponding to the stable state as a reference; according to the recorded output total power P0 and the torques T10 and T20 of the double wind wheels, the recorded output total power P0 and the torques T10 and T20 of the double wind wheels are used as torque reference values of a motor converter torque loop in the double wind wheels of the wind turbine generator, according to the recorded output total power P0 before and after the double wind wheels are in a steady state and the torques T10 and T20 of the double wind wheels, an initial angle theta =0 of a gradient climbing initial point of the double wind wheels is enabled, new torques T1 and T2 of the double wind wheels are modified, the output total power P of the double wind wheels at the initial angle theta =0 is measured, and an array (T1, T2 and P) is correspondingly stored;
after increasing an angle step length delta theta to an initial angle theta of a gradient climbing initial point of the double wind wheels, judging the angle of the initial angle theta, and if the angle of the initial angle theta is smaller than 360 degrees, repeating the operation of measuring the total output power P of the double wind wheels of the wind turbine generator set at the initial angle theta =0 and corresponding storage arrays (T1, T2, P); if the angle of the initial angle theta is greater than or equal to 360 degrees, searching operation of the maximum value of the output total power Pmax is carried out, and the searched maximum value of the output total power Pmax is compared with P0; if the difference value between the maximum value of the output total power P and P0 is smaller than or equal to a threshold value epsilon, the operation is finished, the torque loop torque reference values of the front wind wheel motor converter and the rear wind wheel motor converter are respectively set as T1 and T2, the system enters a new operation steady state, and the maximum power tracking of the tandem double wind wheels is completed; and if the difference value between the maximum value of the output total power P and the P0 is greater than the threshold value epsilon, assigning the value of T1 corresponding to the maximum value of the total power P to T10, assigning the value of T2 corresponding to the maximum value of the total power P to T20, assigning the maximum value of the total power P to P0, namely generating new (T10, T20 and P0), resetting the initial angle theta value of the gradient climbing initial point of the double-wind wheel and calculating.
CN202210462523.2A 2022-04-28 2022-04-28 Maximum power tracking method and system for tandem type double-wind-wheel wind turbine generator set Active CN114673629B (en)

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