CN105337543B - A kind of double-fed fan rotor side output power control method - Google Patents

A kind of double-fed fan rotor side output power control method Download PDF

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Publication number
CN105337543B
CN105337543B CN201510904053.0A CN201510904053A CN105337543B CN 105337543 B CN105337543 B CN 105337543B CN 201510904053 A CN201510904053 A CN 201510904053A CN 105337543 B CN105337543 B CN 105337543B
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mrow
voltage
rotor
value
reference value
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CN105337543A (en
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刘开培
葛思扬
郑景文
黎玉江
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Wuhan University WHU
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Wuhan University WHU
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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
    • H02P9/007—Control circuits for doubly fed generators
    • 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
    • H02P9/10—Control effected upon generator excitation circuit to reduce harmful effects of overloads or transients, e.g. sudden application of load, sudden removal of load, sudden change of load
    • H02P9/105—Control effected upon generator excitation circuit to reduce harmful effects of overloads or transients, e.g. sudden application of load, sudden removal of load, sudden change of load for increasing the stability

Abstract

The present invention relates to a kind of double-fed fan rotor side output power control method.The present invention is by introducing feedforward control, influence caused by so as to eliminate busbar voltage fluctuation, ensures the stable output of object model power in the case of busbar voltage fluctuation, and with control is improved after, capacitance can be reduced, save engineering cost.Rotor-side proposed by the present invention improves control strategy control accuracy height, and response is rapid, the fluctuation of cpable of lowering power when vertical compression fluctuates, and output is more steady.

Description

A kind of double-fed fan rotor side output power control method
Technical field
The present invention relates to a kind of blower fan output power control method, belong to field of electrical equipment, and in particular to a kind of double-fed Fan rotor side output power control method.
Background technology
Determine the wind-driven generator of rotating speed compared to traditional fixed pitch and total power at this stage converts direct-drive type blower fan For, the variable-speed constant-frequency wind power generation based on sensing double feedback electric engine (double fed induction generator, DFIG) Machine has the more preferable quality of power supply, smaller frequency converter and maintenance cost, flexible decoupled active and reactive and wider because of it The advantages that general applicability, turn into the type that current Large Scale Wind Farm Integration mainly uses.
The control targe of double-fed fan rotor side is the decoupling for realizing power and stable output, and its object model is steady Surely it is decided by the stabilization of DC bus-bar voltage.In the vector controlled of conventional rotors side, the premise of control is acquiescence dc bus electricity Fluctuation that is constant, and not considering busbar voltage is pressed, when vertical compression fluctuates, the power in object model can also fluctuate and to power Steady output impacts, meanwhile, in engineering in practice, to ensure the stabilization of vertical compression, typically using larger electric capacity, cause compared with Big cost consumption.
At present, document both domestic and external is to ensure that DC bus-bar voltage is constant for the premise of the control strategy of rotor-side, will Rectifying part is equivalent to constant pressure source, and does not consider the fluctuation of busbar voltage.It fact proved, this hypothesis is difficult in real process Realize.
The content of the invention
The busbar voltage fluctuation that the present invention is mainly solved present in prior art influences the technology of power output stationarity A kind of problem, there is provided double-fed fan rotor side output power control method.This method meets with voltage in double-fed fan rotor and dashed forward During change, electric voltage feed forward is rapidly introduced into control system, eliminates influence caused by busbar voltage fluctuation, so as to be controlled by changing The voltage output of device eliminates the mutation of rotor voltage, ensures the stable output of target power.
In order to solve the above-mentioned technical problem, by the way that the invention provides a kind of double-fed fan rotor side output power side Method, including：
Outer shroud is controlled for obtaining the power between the power actual value of double-fed blower fan output and the value and power reference of setting Difference, power difference feeding PI controllers are obtained into rotor current reference value；
Inner ring is controlled for obtaining the current differential between rotor current actual value and the rotor current reference value, by institute State the rotor voltage control reference value that current differential obtains controller output after PI controllers and cross-couplings item successively；
Feedforward compensation is used for when DC bus-bar voltage changes, and electricity is introduced on the basis of the rotor voltage controls reference value Press Front Feed Compensation.
The double-fed fan rotor side output power control method of above-mentioned optimization, its electric voltage feed forward compensation rate are based on below equation Obtain：
In formula, X is electric voltage feed forward compensation rate,ΔVdcRespectively DC bus-bar voltage stationary value, undulating value, △ tri- Angle carrier amplitude, it is the steady-state value of rotor voltage.
The double-fed fan rotor side output power control method of above-mentioned optimization, in the outer shroud control, described difference power Value includes active power difference and reactive power difference, and the active power difference and reactive power difference control by PI respectively Device obtains d, q component of rotor current reference value；
In the inner ring control, the current differential and voltage control reference value are calculated on d, q component respectively；
In the feedforward compensation, electric voltage feed forward compensation is introduced on the d components and q components of voltage control reference value respectively Amount.
Therefore, the invention has the advantages that：It is rapid in control system when double-fed fan rotor meets with voltage change Electric voltage feed forward is introduced, eliminates influence caused by busbar voltage fluctuation, so as to be turned by changing the voltage output of controller to eliminate The mutation of sub- voltage, ensure the stable output of target power, the present invention is compared with Traditional control, the energy in the case of voltage pulsation Reach power stability more quickly.
Brief description of the drawings
Accompanying drawing 1 is the double-fed blower fan object model of the present invention and improved rotor-side controller model schematic diagram.
Embodiment
Below by embodiment, and with reference to accompanying drawing, technical scheme is described in further detail.
Embodiment：
As shown in Figure 1, Fig. 1 is the object of double-fed blower fan and improved rotor-side controller model overall pattern.
In object model, input quantity is d, q axis component of rotor voltage, and output quantity is active and idle point of blower fan output Amount；In Controlling model, input quantity is the active and reactive component of object model output, and output quantity is the rotor voltage of control system Control reference value.Rotor voltage controls the rotor voltage amount of actually entering of reference value and object model to meet relation
Specific control is as follows：1st, outer shroud uses active and reactive uneoupled control, and inner ring uses Direct Current Control.2nd, outer shroud In control, by the active reactive actual value exported in object model compared with reference value, in difference controls to obtain by PI Rotor current reference value d, q component of ring.3rd, in inner ring control, by the rotor current of object model and outer shroud control input Rotor current reference value is compared, and difference passes through PI controllers, the output voltage reference value after cross-couplings item.4th, when right As model introducing DC voltage Sudden Changing Rate, voltage feedforward control is also rapidly introduced into control system, the voltage ginseng in step 3 Examine and electric voltage feed forward compensation rate X is introduced on the basis of value, by changing the voltage output of controller, and then eliminate object model rotor electricity The mutation of pressure, rotor voltage when allowing the now rotor-side output virtual voltage to be equal to steady-state operation, due to object model input guarantor Hold for steady-state operation when input value it is constant, therefore the stabilization of object model power output can be ensured.
Derivation is as follows in figure：Due to the time delay of control system, when disregarding feedforward the output of controller be designated as T, draw After entering feedforward, the output u of controllerrd* it is (T-X).D axles are now analyzed, and the analysis of q axles is similar.
During stable state, have
After note and DC voltage fluctuation introduce feedforward simultaneously
Simultaneous formula (1), formula (2) make urd=urd0Then
According to formula
Because undulate quantity is smaller relative to steady-state value square, simultaneous formula (3), (4) obtain
Defined in itVdc、ΔVdcRespectively DC bus-bar voltage stationary value, actual value, undulating value；ur *For controller Output rotor voltage magnitude；urFor the input value of rotor voltage actual value, as object model；VdcFor DC bus-bar voltage width Value；△ is triangular carrier amplitude；kpwmFor transverter gain.urd、urd0The respectively actual value of rotor voltage d axis components and steady State value.
Compared to Traditional control, power stability can be reached more quickly in the case of voltage pulsation by improving control.
Specific embodiment described herein is only to spirit explanation for example of the invention.Technology belonging to the present invention is led The technical staff in domain can be made various modifications or supplement to described specific embodiment or be replaced using similar mode Generation, but without departing from the spiritual of the present invention or surmount scope defined in appended claims.

Claims (2)

  1. A kind of 1. double-fed fan rotor side output power control method, it is characterised in that including：
    Outer shroud is controlled for obtaining the power difference between the power actual value of double-fed blower fan output and the value and power reference of setting, Power difference feeding PI controllers are obtained into rotor current reference value；
    Inner ring is controlled for obtaining the current differential between rotor current actual value and the rotor current reference value, by the electricity Stream difference obtains the rotor voltage control reference value of controller output after PI controllers and cross-couplings item successively；
    Feedforward compensation is used for when DC bus-bar voltage changes, before voltage is introduced on the basis of the rotor voltage controls reference value Present compensation rate；
    The electric voltage feed forward compensation rate is obtained based on below equation：
    <mrow> <mi>X</mi> <mo>=</mo> <mfrac> <mrow> <msub> <mi>&amp;Delta;V</mi> <mrow> <mi>d</mi> <mi>c</mi> </mrow> </msub> </mrow> <msubsup> <mi>V</mi> <mrow> <mi>d</mi> <mi>c</mi> </mrow> <mo>*</mo> </msubsup> </mfrac> <mfrac> <msub> <mi>U</mi> <mrow> <mi>r</mi> <mn>0</mn> </mrow> </msub> <msubsup> <mi>V</mi> <mrow> <mi>d</mi> <mi>c</mi> </mrow> <mo>*</mo> </msubsup> </mfrac> <mn>2</mn> <mi>&amp;Delta;</mi> </mrow>
    In formula, X is electric voltage feed forward compensation rate,ΔVdcRespectively DC bus-bar voltage stationary value, undulating value, △ carry for triangle Wave amplitude, Ur0For the steady-state value of rotor voltage.
  2. A kind of 2. double-fed fan rotor side output power control method according to claim 1, it is characterised in that
    In the outer shroud control, described power difference includes active power difference and reactive power difference, the active power Difference and reactive power difference obtain d, q component of rotor current reference value by PI controllers respectively；
    In the inner ring control, the current differential and voltage control reference value are calculated on d, q component respectively；
    In the feedforward compensation, electric voltage feed forward compensation rate is introduced on the d components and q components of voltage control reference value respectively.
CN201510904053.0A 2015-12-09 2015-12-09 A kind of double-fed fan rotor side output power control method Active CN105337543B (en)

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CN111969635A (en) * 2020-07-15 2020-11-20 国网湖北省电力有限公司电力科学研究院 Power control method for voltage fluctuation of direct current capacitor of flexible direct current converter station
CN111969644A (en) * 2020-07-15 2020-11-20 国网湖北省电力有限公司电力科学研究院 Rotor side direct current feedforward control method for double-fed fan direct current capacitance voltage fluctuation

Citations (5)

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CN101697420A (en) * 2009-10-23 2010-04-21 湖南大学 Micro-grid inverter system and electric energy quality control method applicable to same
KR20130088440A (en) * 2012-01-31 2013-08-08 울산대학교 산학협력단 Control apparatus and method for power generator system
CN103580055A (en) * 2012-07-18 2014-02-12 上海寰晟新能源科技有限公司 Open type grid-connection experiment system of variable-speed constant-frequency double-fed wind power generator unit and open type grid-connection experiment method
CN103904637A (en) * 2014-04-15 2014-07-02 佛山市顺德区和而泰电子科技有限公司 Direct-current bus voltage ripple compensation method
CN104113077A (en) * 2014-06-30 2014-10-22 浙江大学 Coordination control method for double-fed asynchronous wind driven generator high voltage ride through

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PL1630948T3 (en) * 2004-08-27 2009-06-30 Woodward Seg Gmbh & Co Kg Power regulation of AC Machines

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101697420A (en) * 2009-10-23 2010-04-21 湖南大学 Micro-grid inverter system and electric energy quality control method applicable to same
KR20130088440A (en) * 2012-01-31 2013-08-08 울산대학교 산학협력단 Control apparatus and method for power generator system
CN103580055A (en) * 2012-07-18 2014-02-12 上海寰晟新能源科技有限公司 Open type grid-connection experiment system of variable-speed constant-frequency double-fed wind power generator unit and open type grid-connection experiment method
CN103904637A (en) * 2014-04-15 2014-07-02 佛山市顺德区和而泰电子科技有限公司 Direct-current bus voltage ripple compensation method
CN104113077A (en) * 2014-06-30 2014-10-22 浙江大学 Coordination control method for double-fed asynchronous wind driven generator high voltage ride through

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