CN101814893A - Method for inhibiting stator current imbalance of doubly-fed wind turbine generator set - Google Patents
Method for inhibiting stator current imbalance of doubly-fed wind turbine generator set Download PDFInfo
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Abstract
The invention relates to a method for inhibiting stator current imbalance of a doubly-fed wind turbine generator set. The method introduces a positive and negative sequence vector decoupling module which is based on a double synchronous rotating coordinate system, the stator voltage and the stator and rotor current of a doubly-fed asynchronous generator are resolved into positive and negative sequence components which are based on the double synchronous rotating coordinate system, thus realizing fast decoupling of the stator and rotor positive and negative sequence current; a stator current negative sequence double closed-loop inhibiting network is established to inhibit the stator current imbalance of the doubly-fed asynchronous generator in the condition of power grid imbalance, thus avoiding the problems that the loss and the heat of the doubly-fed asynchronous generator are increased, the quality of electric energy is reduced and the like caused by power grid imbalance, enhancing the adaptability of the doubly-fed wind turbine generator set in the condition of power grid imbalance, limiting the imbalance degree of the power grid voltage within a certain range and ensuring the doubly-fed wind turbine generator set to be free of off-grid run.
Description
Technical field
The present invention relates to a kind of current imbalance inhibition method, be specifically related to a kind of generator unit stator current imbalance inhibition method.
Background technology
Wind energy is the low-carbon (LC) energy that at present tool large-scale develops and utilizes as a kind of regenerative resource of cleanliness without any pollution.Variable speed constant frequency doubly-fed formula wind turbine generator can be under various wind speed capturing wind energy to greatest extent, be well suited for the direction of wind generating technology development.Because the AC excitation frequency converter only need be supplied with slip power, has significantly reduced the requirement to frequency inverter capacity, the double-feedback aerogenerator that makes consists of one of main force's type of present wind power generation field.The double-fed type asynchronous generator is the multivariable system of a high-order nonlinear close coupling, ignore space harmonics, magnetic circuit is saturated and the situation of core loss under, the equivalent electric circuit of double-fed type asynchronous generator in synchronous dq rotating coordinate system.In order to realize the decoupling zero of active power and Reactive Power Control, control method commonly used has stator voltage vector oriented vector control and stator magnetic linkage oriented vector control.Double-fed type asynchronous generator, especially MW class large power double-fed type asynchronous generator, its stator resistance and its impedance phase are than ignoring usually.Ignoring under the situation of stator resistance, adopting stator voltage vector oriented is the same with stator magnetic linkage oriented vector control technology in essence.Generally speaking, line voltage is certain, and promptly stator voltage is certain, and just stator magnetic linkage is certain.Ignoring under the situation of stator resistance, stator current and rotor current are linear, as long as the control rotor current just can be controlled the size of stator current, are the purpose of stator power output thereby reach the control stator current therefore.But the situation of the three phase network balance of voltage has only been considered in the design of general double-feedback aerogenerator set control system, when the three phase network Voltage unbalance, just can cause the imbalance of threephase stator electric current, cause loss to increase, heating increases, torque pulsation and because the appearance of degradation problem under the fatigue loss of gear box that torque pulsation caused and mechanical transfer axle, reactive power pulsation, the quality of power supply.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, a kind of imbalance that can suppress double-fed type asynchronous generator stator current under the unbalanced power supply condition is provided, avoid the double-fed type asynchronous generator loss that causes because of unbalanced power supply to increase, heating increases and the quality of power supply under the method for appearance of degradation problem.
The present invention is achieved by the following technical solutions:
Method for inhibiting stator current imbalance of doubly-fed wind turbine generator set, its step is as follows:
(1) gathers stator voltage,, obtain stator voltage and rotate dq respectively synchronously through coordinate transform
p, dq
nValue u under the coordinate system
Sd p, u
Sq p, u
Sd n, u
Sq n
(2), calculate stator voltage positive-negative sequence component u respectively through stator voltage positive-negative sequence decoupling zero module
Sd * p, u
Sq * p, u
Sd * n, u
Sq * q
(3) obtain stator voltage positive sequence space vector angle θ by the stator voltage phase-locked loop module
s p, and calculate stator voltage negative phase-sequence space vector angle θ
s n
(4) gather stator and rotor electric current and rotor position angle θ
r, calculate the positive-negative sequence azimuth θ of rotor current
Sl p, θ
Sl nRespectively by coordinate transform, utilize stator and rotor electric current positive-negative sequence decoupling zero module then, calculate the positive-negative sequence component i of stator and rotor electric current respectively
Sd * p, i
Sq * p, i
Sd * n, i
Sq * n, i
Rd * p, i
Rq * p, i
Rd * n, i
Rq * n
(5) constitute the two closed loops of stator current negative phase-sequence by stator current negative phase-sequence adjustor module and rotor current negative phase-sequence adjustor module and suppress network; Simultaneously, the output i of stator current negative phase-sequence adjustor module
Rd_ref * n, i
Rq_ref * nInput as rotor current negative phase-sequence adjustor module;
(6) constitute stator current positive sequence Control Network by rotor current positive sequence adjustor module; Simultaneously, the input i of rotor current positive sequence adjustor module
Rd_ref * p, i
Rq_ref * pGiven by the outside;
(7) rotor current positive sequence adjuster output u
Rd * p, u
Rq * pAnd rotor current negative phase-sequence adjuster output u
Rd * n, u
Rq * nPass through Park respectively
-1Conversion, vector synthesize, and obtain the input u of rotor voltage space vector generation module
R α, u
R β
Method for inhibiting stator current imbalance of doubly-fed wind turbine generator set, in the above-mentioned steps (3) with the output u of stator voltage positive-negative sequence decoupling zero module
Sq * pAs the input of phase-locked loop module, obtain stator voltage positive sequence space vector angle θ
s p
Method for inhibiting stator current imbalance of doubly-fed wind turbine generator set, in the above-mentioned steps (3) to positive sequence azimuth θ
s pNegate obtains stator voltage negative phase-sequence space vector angle θ
s n
Method for inhibiting stator current imbalance of doubly-fed wind turbine generator set is characterized in that the stator voltage positive-negative sequence azimuth θ that calculates in the above-mentioned steps (3)
s p, θ
s nFeed back to stator voltage positive-negative sequence decoupling zero module again and be used for the positive-negative sequence decoupling zero of stator voltage.
Method for inhibiting stator current imbalance of doubly-fed wind turbine generator set, above-mentioned steps is passed through formula in (4)
Obtain the positive sequence azimuth of rotor current,
Obtain the negative phase-sequence azimuth of rotor current.
Method for inhibiting stator current imbalance of doubly-fed wind turbine generator set, the output u of the positive and negative preface adjuster of above-mentioned steps (7) rotor electric current
Rd * p, u
Rq * p, u
Rd * n, u
Rq * nPass through Park respectively
-1, obtain the component u of each self tuning regulator output in the positive-negative sequence of rest frame lower rotor part voltage given value
R α * p, u
R β * p, u
R α * n, u
R β * nPass through the component u of the positive-negative sequence of synthetic rest frame lower rotor part voltage given value again
R α * p, u
R β * p, u
R α * n, u
R β * nObtain the input u of rotor voltage space vector generation module
R α, u
R β
Introducing is based on the positive-negative sequence vector decoupling zero module of two synchronous rotating frames, double-fed type asynchronous generator stator voltage and stator and rotor Current Decomposition are become based on the positive-negative sequence component under two synchronous rotating frames, realized the quick decoupling zero of stator and rotor positive-negative sequence current; The two closed loops of structure stator current negative phase-sequence suppress network, have suppressed the imbalance of double-fed type asynchronous generator stator current under the unbalanced power supply condition.
The control method that the present invention proposes, need not under the situation of double-fed type asynchronous generator parameter accurately, it is fixed just can to realize, the quick decoupling zero of rotor current positive-negative sequence component, negative sequence component by the control stator current reaches the unbalanced purpose of stator current that the inhibition unbalanced power supply causes, thereby the double-fed type asynchronous generator loss of avoiding causing because of unbalanced power supply increases, heating increase and the quality of power supply under the appearance of degradation problem, improved the adaptive capacity of double-feedback aerogenerator group under the unbalanced power supply condition, make line voltage degree of unbalance within the specific limits, the double-feedback aerogenerator group is not from network operation.
Description of drawings
Fig. 1 is a double-feedback aerogenerator group system topological diagram in the background technology.
Fig. 2 is the equivalent circuit diagram of synchronous coordinate system d axle double-fed type asynchronous generator.
Fig. 3 is the equivalent circuit diagram of synchronous coordinate system q axle double-fed type asynchronous generator.
Fig. 4 is a stator current positive-negative sequence decoupling zero module.
Fig. 5 is a stator voltage positive-negative sequence decoupling zero module.
Fig. 6 is a rotor current positive-negative sequence decoupling zero module.
Fig. 7 is a double-feedback type wind generator set stator current positive-negative sequence decoupling zero control block diagram.
Fig. 8 is a rotor-side converter of double-fed wind generating set software work schematic diagram.
Embodiment
When unbalanced power system is analyzed, use symmetry component theory usually, asymmetric part in the circuit is turned to voltage, the asymmetric boundary condition of electric current, remaining circuit still is considered as the linear circuit of symmetry.Any one group of asymmetric three-phase phasor as voltage, electric current etc., can resolve into the three-phase phasor of three groups of symmetries that phase sequence has nothing in common with each other, i.e. zero-sequence component, positive sequence component and negative sequence component.For ease of analyzing, at first (Double Synchronous Reference Frame, DSRF) situation under is analyzed at two synchronous coordinate systems to unsymmetrical current.DSRF comprises two rotating coordinate systems, wherein the synchronous dq of positive sequence
pRotating coordinate system is with ω
pAngular speed is rotated counterclockwise, and its phase place is made as
And the synchronous dq of negative phase-sequence
nRotating coordinate system is with ω
nAngular speed turns clockwise, and its phase place is made as
Be example with double-fed type asynchronous generator stator current vector below, ignore under the stator current high order harmonic component condition, analyze positive-negative sequence vector decoupling zero based on two synchronous rotating frames.For wire system in not having, owing to can not form zero-sequence current, the electric current that does not therefore have the center line three-phase system can resolve into fundamental positive sequence (abbreviation positive sequence component) and first-harmonic negative sequence component (abbreviation negative sequence component) under rest frame, that is:
At the synchronous dq of single positive sequence
pCurrent phasor can be expressed as in the rotating coordinate system:
And at the synchronous dq of single negative phase-sequence
nCurrent phasor can be expressed as again in the rotating coordinate system:
From formula (2), (3) as can be seen, if still when adopting positive sequence or negative phase-sequence synchronous rotating frame to do reference frame separately, the current phasor amplitude all contains angular speed (ω
p+ ω
n) pulsating quantity.Synchronous dq
pThe amplitude of the oscillating quantity in the rotating coordinate system is decided by the amplitude of negative sequence component; And synchronous dq
nThe amplitude of the oscillating quantity in the rotating coordinate system is decided by the positive sequence component amplitude.In order to decomposite the positive and negative preface component of stator current apace, formula (2), (3) are similar to and are rewritten into:
According to formula (4), (5), adopted decoupling zero module as shown in Figure 2.I among the figure
Sd * p, i
Sq * p, i
Sd * nAnd i
Sq * nBe respectively positive-negative sequence current d, q axle transient component after the decoupling zero,
With
Be respectively the positive-negative sequence current d after the decoupling zero, the instantaneous mean value of q axle component.Similarly, can construct stator voltage positive-negative sequence decoupling zero module and rotor current positive-negative sequence decoupling zero module, show as Fig. 4,5.
As long as stator voltage is certain, and the positive-negative sequence component of stator magnetic linkage is just certain, therefore the negative sequence component i of control rotor current
Rd * n, i
Rq * nJust can reach the purpose that suppresses stator current imbalance of doubly-fed wind turbine generator set under the unbalanced source voltage condition.
Fig. 6 is a double-feedback type wind generator set stator current positive-negative sequence decoupling zero control block diagram.Its functional module mainly comprises stator voltage positive-negative sequence decoupling zero module, stator voltage phase-locked loop module, stator current positive-negative sequence decoupling zero module, rotor current positive-negative sequence decoupling zero module, stator current negative phase-sequence adjustor module, rotor current positive sequence adjustor module, rotor current negative phase-sequence adjustor module, rotor voltage space vector generation module.Its step is as follows:
1. gather the stator three-phase voltage, utilize stator voltage positive-negative sequence decoupling zero module that stator voltage is carried out the positive-negative sequence decoupling zero; Simultaneously with the output u of stator voltage positive-negative sequence decoupling zero module
Sq * pAs the input of software phase-lock loop module, obtain stator voltage positive sequence space vector angle θ
s pTo positive sequence azimuth θ
s pNegate obtains stator voltage negative phase-sequence space vector angle θ
s nThe stator voltage positive-negative sequence azimuth θ that calculates
s p, θ
s nFeed back to stator voltage positive-negative sequence decoupling zero module again and be used for the positive-negative sequence decoupling zero of stator voltage.
2. read rotor position angle θ
r, pass through formula
Obtain the positive sequence azimuth of rotor current,
Obtain the negative phase-sequence azimuth of rotor current; Gather three-phase stator and rotor electric current, utilize stator and rotor electric current positive-negative sequence decoupling zero module, calculate the positive-negative sequence component i of stator and rotor electric current respectively
Sd * p, i
Sq * p, i
Sd * n, i
Sq * n, i
Rd * p, i
Rq * p, i
Rd * n, i
Rq * n
3. constitute the two closed loops of stator current negative phase-sequence by stator current negative phase-sequence adjustor module and rotor current negative phase-sequence adjustor module and suppress network.Inputing to of stator current negative phase-sequence adjustor module is decided to be 0; Simultaneously, the output of stator current negative phase-sequence adjustor module is as the input i of rotor current negative phase-sequence adjustor module
Rd_ref * n, i
Rq_ref * n
4. constitute stator current positive sequence Control Network by rotor current positive sequence adjustment module.Rotor current
The input i of positive sequence adjustment module
Rd_ref * p, i
Rq_ref * pGiven by the outside.
5. the output u of the positive and negative adjuster of rotor current
Rd * p, u
Rq * p, u
Rd * n, u
Rq * nPass through Park respectively
-1, obtain the component u of each self tuning regulator output in the positive-negative sequence of rest frame lower rotor part voltage given value
R α * p, u
R β * p, u
R α * n, u
R β * nPass through the component u of the positive-negative sequence of synthetic rest frame lower rotor part voltage given value again
R α * p, u
R β * p, u
R α * n, u
R β * nObtain the input u of rotor voltage space vector generation module
R α, u
R β
Fig. 7 is used to suppress the unbalanced rotor-side converter software work schematic diagram that unbalanced power supply causes stator current for the present invention.Usually since double-feedback type wind generator be incorporated into the power networks for two steps with current transformer branch open-circuit excitation and stator because before stator was incorporated into the power networks, stator did not have electric current to flow through, so during specific implementation of the present invention, divide stator to be incorporated into the power networks before and the stator back two parts that are incorporated into the power networks.
Before stator is incorporated into the power networks, have only rotor current positive sequence adjuster to be used for the open-circuit excitation of double-fed type asynchronous generator.During open-circuit excitation, because stator is not incorporated into the power networks, the stator voltage of sampling is not actual stator voltage, but line voltage.Stator current positive-negative sequence decoupling zero module and stator and rotor electric current negative phase-sequence adjustor module do not participate in work, and the output u of rotor current positive sequence adjuster is only arranged
Rd * p, u
Rq * pThrough Park
-1After the conversion as the input u of space voltage vector generation module
R α, u
R β
After stator is incorporated into the power networks, stator current positive-negative sequence decoupling zero module and stator and rotor electric current negative phase-sequence adjustor module participation work.Because stator links to each other with electrical network, stator voltage in fact just equals line voltage.The stator current positive-negative sequence is separated the stator current negative phase-sequence i of decoupling
Sd * n, i
Sq * nComponent is as the feedback of stator current negative phase-sequence adjuster; The output i of stator current negative phase-sequence adjuster
Rd_ref * n, i
Rq_ref * nInput as rotor current negative phase-sequence adjuster; The input of rotor current positive sequence adjuster is given by the master control communication; The output of the positive and negative preface adjuster of rotor current is respectively through Park
-1Conversion, vector synthesize the input of back as space voltage vector generation module.After stator is incorporated into the power networks, because the two closed loops of the stator current negative phase-sequence that stator current negative phase-sequence adjustor module and rotor current negative phase-sequence adjustor module constitute suppress the effect of network, thereby reach the purpose that suppresses stator current imbalance of doubly-fed wind turbine generator set under the unbalanced power supply condition.
Claims (6)
1. method for inhibiting stator current imbalance of doubly-fed wind turbine generator set, its step is as follows:
(1) gathers stator voltage,, obtain stator voltage and rotate dq respectively synchronously through coordinate transform
p, dq
nValue u under the coordinate system
Sd p, u
Sq p, u
Sd n, u
Sq n
(2), calculate stator voltage positive-negative sequence component u respectively through stator voltage positive-negative sequence decoupling zero module
Sd * p, u
Sq * p, u
Sd * n, u
Sq * n
(3) obtain stator voltage positive sequence space vector angle θ by the stator voltage phase-locked loop module
s p, and calculate stator voltage negative phase-sequence space vector angle θ
s n
(4) gather stator and rotor electric current and rotor position angle θ
r, calculate the positive-negative sequence azimuth θ of rotor current
Sl p, θ
Sl nRespectively by coordinate transform, utilize stator and rotor electric current positive-negative sequence decoupling zero module then, calculate the positive-negative sequence component i of stator and rotor electric current respectively
Sd * p, i
Sq * p, i
Sd * n, i
Sq * n, i
Rd * p, i
Rq * p, i
Rd * n, i
Rq * n
(5) constitute the two closed loops of stator current negative phase-sequence by stator current negative phase-sequence adjustor module and rotor current negative phase-sequence adjustor module and suppress network; Simultaneously, the output i of stator current negative phase-sequence adjustor module
Rd_ref * n, i
Rq_ref * nInput as rotor current negative phase-sequence adjustor module;
(6) constitute stator current positive sequence Control Network by rotor current positive sequence adjustor module; Simultaneously, the input i of rotor current positive sequence adjustor module
Rd_ref * p, i
Rq_ref * pGiven by the outside;
(7) rotor current positive sequence adjuster output u
Rd * p, u
Rq * pAnd rotor current negative phase-sequence adjuster output u
Rd * n, u
Rq * nPass through Park respectively
-1Conversion, vector synthesize, and obtain the input u of rotor voltage space vector generation module
R α, u
R β
2. method for inhibiting stator current imbalance of doubly-fed wind turbine generator set according to claim 1 is characterized in that in the described step (3) the output u with stator voltage positive-negative sequence decoupling zero module
Sq * pAs the input of phase-locked loop module, obtain stator voltage positive sequence space vector angle θ
s p
3. method for inhibiting stator current imbalance of doubly-fed wind turbine generator set according to claim 1 is characterized in that in the described step (3) positive sequence azimuth θ
s pNegate obtains stator voltage negative phase-sequence space vector angle θ
s n
4. according to claim 1 or 3 described method for inhibiting stator current imbalance of doubly-fed wind turbine generator set, it is characterized in that the stator voltage positive-negative sequence azimuth θ that calculates in the described step (3)
s p, θ
s nFeed back to stator voltage positive-negative sequence decoupling zero module again and be used for the positive-negative sequence decoupling zero of stator voltage.
5. method for inhibiting stator current imbalance of doubly-fed wind turbine generator set according to claim 1 is characterized in that passing through formula in the described step (4)
Obtain the positive sequence azimuth of rotor current,
Obtain the negative phase-sequence azimuth of rotor current.
6. method for inhibiting stator current imbalance of doubly-fed wind turbine generator set according to claim 1 is characterized in that the output u of the positive and negative preface adjuster of described step (7) rotor electric current
Rd * p, u
Rq * p, u
Rd * n, u
Rq * nPass through Park respectively
-1, obtain the component u of each self tuning regulator output in the positive-negative sequence of rest frame lower rotor part voltage given value
R α * p, u
R β * p, u
R α * n, u
R β * nPass through the component u of the positive-negative sequence of synthetic rest frame lower rotor part voltage given value again
R α * p, u
R β * p, u
R α * n, u
R β * nObtain the input u of rotor voltage space vector generation module
R α, u
R β
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|---|---|---|---|---|
| CN102332861A (en) * | 2011-09-20 | 2012-01-25 | 中国农业大学 | Method for controlling active power of double-fed wind power generator |
| CN102522942A (en) * | 2011-09-20 | 2012-06-27 | 中国农业大学 | Excitation control method of doubly-fed wind-driven generator |
| CN102751934A (en) * | 2012-07-20 | 2012-10-24 | 阳光电源股份有限公司 | Device and method for cooperatively controlling unbalanced current of doubly-fed converter |
| CN103840482A (en) * | 2014-01-13 | 2014-06-04 | 上海理工大学 | Method for controlling photovoltaic grid-connected inverter when unsymmetrical fault of power grid happens |
| CN105262389A (en) * | 2015-09-18 | 2016-01-20 | 中国电力科学研究院 | Positive and negative sequence separation method for self-adaptive compensation on DC deviation of double-fed wind power generation set |
| CN105375499A (en) * | 2015-11-12 | 2016-03-02 | 浙江日风电气股份有限公司 | Suppression method for stator current unbalance of doubly-fed wind generator |
| CN105703677A (en) * | 2014-11-25 | 2016-06-22 | 国家电网公司 | Double fed wind driven generator rotor transient current calculating method |
| CN106452234A (en) * | 2016-10-18 | 2017-02-22 | 上海电力学院 | Method for inhibiting turn-to-turn short-circuit negative-sequence current of stator of double-fed wind generator |
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| CN102522942B (en) * | 2011-09-20 | 2014-01-22 | 中国农业大学 | Excitation control method of doubly-fed wind-driven generator |
| CN102522942A (en) * | 2011-09-20 | 2012-06-27 | 中国农业大学 | Excitation control method of doubly-fed wind-driven generator |
| CN102332861A (en) * | 2011-09-20 | 2012-01-25 | 中国农业大学 | Method for controlling active power of double-fed wind power generator |
| CN102332861B (en) * | 2011-09-20 | 2013-09-18 | 中国农业大学 | Method for controlling active power of double-fed wind power generator |
| CN102751934B (en) * | 2012-07-20 | 2015-08-26 | 阳光电源股份有限公司 | A kind of double-feed current transformer unsymmetrical current Collaborative Control device and control method thereof |
| CN102751934A (en) * | 2012-07-20 | 2012-10-24 | 阳光电源股份有限公司 | Device and method for cooperatively controlling unbalanced current of doubly-fed converter |
| CN103840482A (en) * | 2014-01-13 | 2014-06-04 | 上海理工大学 | Method for controlling photovoltaic grid-connected inverter when unsymmetrical fault of power grid happens |
| CN105703677A (en) * | 2014-11-25 | 2016-06-22 | 国家电网公司 | Double fed wind driven generator rotor transient current calculating method |
| CN105703677B (en) * | 2014-11-25 | 2018-05-22 | 国家电网公司 | A kind of computational methods of double-feedback aerogenerator rotor transient current |
| CN105262389A (en) * | 2015-09-18 | 2016-01-20 | 中国电力科学研究院 | Positive and negative sequence separation method for self-adaptive compensation on DC deviation of double-fed wind power generation set |
| CN105375499A (en) * | 2015-11-12 | 2016-03-02 | 浙江日风电气股份有限公司 | Suppression method for stator current unbalance of doubly-fed wind generator |
| CN105375499B (en) * | 2015-11-12 | 2018-03-09 | 浙江日风电气股份有限公司 | A kind of suppressing method of double-fed aerogenerator stator current imbalance |
| CN106452234A (en) * | 2016-10-18 | 2017-02-22 | 上海电力学院 | Method for inhibiting turn-to-turn short-circuit negative-sequence current of stator of double-fed wind generator |
| CN106452234B (en) * | 2016-10-18 | 2018-09-21 | 上海电力学院 | A kind of double-fed aerogenerator stator turn-to-turn short circuit negative-sequence current suppressing method |
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