CN107492872A - A kind of wind field current collection line current fast tripping protection fixed value adjusting method of blower fan containing double-fed - Google Patents

A kind of wind field current collection line current fast tripping protection fixed value adjusting method of blower fan containing double-fed Download PDF

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Publication number
CN107492872A
CN107492872A CN201710767863.5A CN201710767863A CN107492872A CN 107492872 A CN107492872 A CN 107492872A CN 201710767863 A CN201710767863 A CN 201710767863A CN 107492872 A CN107492872 A CN 107492872A
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mrow
msub
blower fan
double
fed
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Inventor
王宝华
冯爱成
周荣
伏姜
李明磊
白凡
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Nanjing University of Science and Technology
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Nanjing University of Science and Technology
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Priority to CN201710767863.5A priority Critical patent/CN107492872A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/006—Calibration or setting of parameters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
    • H02H7/28—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for meshed systems

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  • Control Of Positive-Displacement Air Blowers (AREA)

Abstract

The invention discloses a kind of wind field current collection line current fast tripping protection fixed value adjusting method of blower fan containing double-fed, this method comprises the following steps：1) confirm the system construction drawing for including double-fed blower fan wind power plant, determine system, circuit and transformer impedance and specific connected mode；2) double-fed blower fan design parameter is confirmed；3) double-fed blower fan equivalent impedance is calculated according to double-fed blower fan maximum short circuit current；4) fixed value calculation is carried out to current collection line current fast tripping protection.Fixed value calculation need not be carried out further according to electric system simulation result using this method, fixed value calculation is directly carried out according to system and fan parameter, it is simple and efficient.

Description

A kind of wind field current collection line current fast tripping protection fixed value adjusting method of blower fan containing double-fed
Technical field
The invention belongs to the technical field of relay protection fixed value setting, particularly a kind of wind field collection electric line of blower fan containing double-fed Current quick fixed value adjusting method.
Background technology
As wind-powered electricity generation more and more accesses network system, the protection problem of double-fed wind field collection electric wire gradually causes people's Concern, if regarding the blower fan in field as load during failure carries out protection fixed value calculation, the short circuit current that double-fed blower fan provides can Current collection route protection malfunction in field can be caused.
The current collection line voltage distribution grade of wind field is generally 35kV, the setting principle of the power distribution network relay protection of conventional radiation shape It will no longer be suitable for Double-End Source network, and the first line of defence of the relay protection as electric power netting safe running, it is therefore necessary to it is right Protection seting is studied, but there is no associated description in the prior art.
The content of the invention
It is an object of the invention to provide a kind of wind field current collection line current fast tripping protection of blower fan containing double-fed fixed value adjusting side Method.
The technical solution for realizing the object of the invention is：Equiva lent impedance is calculated based on double-fed blower fan maximum short circuit current Fixed value calculation method, comprises the following steps：
Step 1, confirm comprising double-fed blower fan power system wiring diagram, determine system, circuit and transformer impedance and Specific connected mode；
Step 2, confirm double-fed blower fan design parameter；
Step 3, according to double-fed blower fan maximum short circuit current calculate double-fed blower fan equivalent impedance；
Step 4, fixed value calculation is carried out to current collection line current fast tripping protection.
Compared with prior art, advantages of the present invention is：1) method of the invention can be according to double-fed blower fan design parameter： Double-fed fan stator leakage inductance Lsσ, rotor leakage inductance Lrσ, magnetizing inductance Lm, crow bar resistance RCB, stator resistance RsAnd rotor resistance RrMeter The maximum short circuit current of blower fan offer is provided, and calculates equiva lent impedance based on this, it is not necessary to which double-fed blower fan system emulates；2) Double-fed blower fan is considered as power supply rather than load by the present invention, is carried out according to the maximum short circuit current for first case low pressure side failure of hiding Adjust the selectivity that can guarantee that and collect between electric line and box change.
Brief description of the drawings
Fig. 1 is the windfarm system structure chart of blower fan containing double-fed.
Fig. 2 is the structure chart of double-fed blower fan.
Fig. 3 is without crow bar double-fed blower fan transient magnetic.
Fig. 4 is the system wiring figure of certain wind power plant of blower fan containing double-fed.
Fig. 5 is system impedance figure.
Fig. 6 is simplified system impedance figure.
Embodiment
With reference to accompanying drawing, one kind blower fan containing double-fed wind field current collection line current fast tripping protection fixed value adjusting method of the invention, Comprise the following steps：
Step 1, confirm comprising double-fed blower fan power system wiring diagram, determine system, circuit and transformer impedance and Specific connected mode；Described connected mode is：Double-fed blower fan boosts through box type transformer collection electric wire, by wind field main transformer and send Outlet is connected with power distribution network.
Step 2, confirm double-fed blower fan design parameter；Described double-fed blower fan design parameter includes：Double-fed fan stator Leakage inductance Lsσ；Rotor leakage inductance Lrσ；Magnetizing inductance Lm；Crow bar resistance RCB；Stator resistance Rs；Rotor resistance Rr。
Step 3, according to double-fed blower fan maximum short circuit current calculate double-fed blower fan equivalent impedance；Specially：
Step 3-1, the electro-magnetic transient equation of double-fed blower fan is established, is specially：
ψs=Lsis+Lmir
ψr=Lmis+Lrir
Wherein：U, i, R, L, ψ represent voltage, electric current, resistance, inductance and magnetic linkage respectively；Subscript s and r represent stator respectively Winding and rotor windings；Ls=Lsσ-Lm、Lr=Lrσ-Lm, LsσAnd LrσStator leakage inductance and rotor leakage inductance are represented respectively；LmRepresent and swash Magnetoelectricity sense；ωpFor slip angular frequency；ωsAnd ωrSynchronous angular velocity and angular rate are represented respectively；T represents the time；
Step 3-2, maximum short circuit current during failure is determined, is specially：
Assuming that double-fed blower fan generator terminal three-phase shortcircuit occurred at the t=0 moment, and work as t=0+Moment crow bar put into, stator it is short Road electric current is：
Wherein：For stator side Voltage Drop coefficient；Us0For the stator side set end voltage before failure；Us1 For the stator side set end voltage after failure；τs=L's/RsAnd τr= L'r/(Rr+RCB)；Is0For the stator current before failure；Stator current initial angle when α is failure；
In the case of considering most serious, α=0, KdThe instantaneous maximum of=1, A phase short circuit current is：
Wherein：T is 0.02s；
Step 3-3, the equiva lent impedance of double-fed blower fan is determined by the instantaneous maximum of short circuit current, formula used is：
Step 4, fixed value calculation is carried out to current collection line current fast tripping protection.Formula used is：
Wherein, KrelFor safety factor, 1.1 are taken；For the maximum short circuit current of first case low pressure side failure；XSTo be The system impedance united under maximum operational mode；XTFor the impedance of main transformer；XLTo collect antenna impedance；X∑For double-fed blower fan, it is box change and Collect the comprehensive impedance of electric wire；XCase TFor the impedance of box change；nTAFor current transformer ratio.
The method of the present invention can be according to double-fed blower fan design parameter：Double-fed fan stator leakage inductance Lsσ, rotor leakage inductance Lrσ、 Magnetizing inductance Lm, crow bar resistance RCB, stator resistance RsAnd rotor resistance RrThe maximum short circuit current that calculating blowing machine provides, and with Equiva lent impedance is calculated based on this, it is not necessary to which double-fed blower fan system emulates；Double-fed blower fan is considered as power supply rather than born by the present invention Lotus, according to the maximum short circuit current for first case low pressure side failure of hiding adjust can guarantee that collection electric line and box change between Selectivity.
It is described in more detail below.
A kind of wind field current collection line current fast tripping protection fixed value adjusting method of blower fan containing double-fed, be shown in Fig. 1 containing pair Realize on feedback blower fan windfarm system structure chart, mainly connected by double-fed blower fan after box change boosting through main transformer boosting with power network Connect.
The present invention is a kind of wind field current collection line current fast tripping protection fixed value adjusting method of blower fan containing double-fed.Firstly the need of true Recognize the wiring diagram of the power system comprising double-fed blower fan, specify the specific mode of connection of system, secondly confirm that double-fed blower fan is specifically joined Number, the short circuit current provided during the double-fed blower fan short circuit of different parameters is different, passes through the maximum that these parameters calculate short circuit current Value, and equiva lent impedance is calculated based on this, system impedance figure is drawn afterwards, finally carries out collecting wire current quick-break definite value meter Calculate.
The structure of double-fed blower fan is as shown in Figure 2.
The calculating equiva lent impedance computational methods of the present invention comprise the steps of：
Step 1, the electro-magnetic transient equation for establishing double-fed blower fan, it is specially：
ψs=Lsis+Lmir (3)
ψr=Lmis+Lrir (4)
Wherein：U, i, R, L, ψ represent voltage, electric current, resistance, inductance and magnetic linkage respectively；Subscript s and r represent stator respectively Winding and rotor windings；Ls=Lsσ-Lm、Lr=Lrσ-Lm, LsσAnd LrσStator leakage inductance and rotor leakage inductance are represented respectively；LmRepresent and swash Magnetoelectricity sense；ωpFor slip angular frequency；ωsAnd ωrSynchronous angular velocity and angular rate are represented respectively；T represents the time.
It is as shown in Figure 3 without crow bar double-fed blower fan transient magnetic.
Step 2, the relation that stator and rotor current is expressed as to rotor magnetic linkage, it is specially：
According to formula (3), (4), stator and rotor electric current can be expressed as：
Wherein：And
Step 3, by after failure rotor magnetic linkage substitute into, calculate double-fed blower fan maximum short circuit current, be specially：
Rotor magnetic linkage after failure：
Wherein：Zs=RCB+jωsL's；RCBFor crow bar resistance；For stator side Voltage Drop system Number；Us0For the stator side set end voltage before failure；Us1For the stator side set end voltage after failure；τs=L's/RsAnd τr=L'r/ (Rr+RCB)；Is0For the stator current before failure；T is the time.
Then the maximum short circuit current of double-fed blower fan is：
Wherein：Stator current initial angle when α is failure.
In the case of considering most serious, α=0, KdThe instantaneous maximum of=1, A phase short circuit current is：
Wherein T is 0.02s.
Step 4, double-fed blower fan equiva lent impedance is calculated, be specially：
From the computational methods of conventional synchronization generator short circuit current, approximation, which simplifies, calculates the maximum that blower fan can provide Short circuit current.
Then the equiva lent impedance of double-fed blower fan is
Calculate collection electric wire line impedance：XL=xl, line length l is multiplied by for the line impedance x of unit length.
The impedance of calculating transformer, it is specially：
Wherein：SNFor the three-phase rated capacity of transformer；VNFor rated line voltage；ΔPSFor short circuit loss；VS% is short circuit Voltage.
Line impedance, transformer impedance, double-fed blower fan and system impedance are brought into and draw system impedance figure.
Carry out collection wire current quick-break to adjust, be specially：
Wherein, KrelFor safety factor, 1.1 are taken；For the maximum short circuit current of first case low pressure side failure；XSTo be The system impedance united under maximum operational mode；XTFor the impedance of main transformer；XLTo collect antenna impedance；X∑For double-fed blower fan, it is box change and Collect the comprehensive impedance of electric wire；XCase TFor the impedance of box change；nTAFor current transformer ratio.
Further detailed description is done to the present invention with reference to embodiment.
Embodiment
If Fig. 4 is the system wiring figure of certain wind power plant of blower fan containing double-fed, the impedance under the big mode of system is Zs= 0.0583pu, it is made up of 10 1MW double-fed blower fan, double-fed fan parameter is consistent：Double-fed fan stator leakage inductance Lsσ=0.1pu； Rotor leakage inductance Lrσ=0.11pu；Magnetizing inductance Lm=4.5pu；Crow bar resistance RCB=0.4pu；Stator resistance Rs=0.0054pu； Rotor resistance Rr=0.00607, rated line voltage 690V, the capacity of box change is 1.6MVA, no-load voltage ratio 0.69/36.75kV, Connection set is Dyn11, leakage reactance 6.5%, and the capacity of main transformer is 20MVA, no-load voltage ratio 37/121kV, and connection set is Ynd11, leakage reactance 10.37%, integrate electric wire reactance as x=0.3675 Ω/km, the current collection linear distance between box change is 1km.
Double-fed blower fan maximum short circuit current is calculated, brings double-fed fan parameter into formula (10)：
Wherein：
τs=L's/Rs=0.2074/0.0054=38.4074 (17)
τr=L'r/(Rr+RCB)=0.2078/ (0.00607+0.4)=0.5117 (18)
Formula (15), (16), (17) and (18) band such as formula (10) is obtained：
Calculate the equiva lent impedance of double-fed blower fan：
Box impedance calculates：
Main transformer impedance computation：
Collect antenna impedance：
Double-fed blower fan equiva lent impedance, box impedance, main transformer impedance, collection antenna impedance and the maximum fortune calculated more than System impedance under line mode draws system impedance figure, as shown in Figure 5.
Collection wire current quick-break is carried out to adjust：
Wherein KrelFor safety factor, 1.1 are taken；XSFor the system impedance under system maximum operational mode；XTWhat it is for main transformer is System impedance；XLTo collect antenna impedance；X∑For the comprehensive impedance of double-fed blower fan, box change and collection electric wire；XCase TFor the impedance of box change； nTAIt is 400/5 for current transformer ratio.
Wherein X∑The comprehensive impedance of the double-fed blower fan for being S1-S9 by numbering, box change and collection electric wire, the system after simplifying Impedance diagram is as shown in Figure 6.
Calculating parameter generation such as formula (14) by more than obtains：
From the foregoing, it will be observed that the method for the present invention can realize the wind field current collection line electricity flow velocity based on double-fed blower fan design parameter Disconnected protection seting, it is simple and efficient.

Claims (5)

  1. A kind of 1. wind field current collection line current fast tripping protection fixed value adjusting method of blower fan containing double-fed, it is characterised in that including following Step：
    Step 1, the wiring diagram for confirming the power system comprising double-fed blower fan, determine system, circuit and transformer impedance and specific Connected mode；
    Step 2, confirm double-fed blower fan design parameter；
    Step 3, according to double-fed blower fan maximum short circuit current calculate double-fed blower fan equivalent impedance；
    Step 4, fixed value calculation is carried out to current collection line current fast tripping protection.
  2. 2. the wind field of blower fan containing double-fed current collection line current fast tripping protection fixed value adjusting method according to claim 1, it is special Sign is that the connected mode described in step 1 is：Double-fed blower fan boosts through box type transformer collection electric wire, by wind field main transformer and Line is sent out to be connected with power distribution network.
  3. 3. the wind field of blower fan containing double-fed current collection line current fast tripping protection fixed value adjusting method according to claim 1, it is special Sign is that the double-fed blower fan design parameter described in step 2 includes：Double-fed fan stator leakage inductance Lsσ；Rotor leakage inductance Lrσ；Swash Magnetoelectricity sense Lm；Crow bar resistance RCB；Stator resistance Rs；Rotor resistance Rr。
  4. 4. the wind field of blower fan containing double-fed current collection line current fast tripping protection fixed value adjusting method according to claim 1, it is special Sign is that step 3 calculates double-fed blower fan equivalent impedance according to double-fed blower fan maximum short circuit current and is specially：
    Step 3-1, the electro-magnetic transient equation of double-fed blower fan is established, is specially：
    <mrow> <msub> <mi>u</mi> <mi>s</mi> </msub> <mo>=</mo> <msub> <mi>R</mi> <mi>s</mi> </msub> <msub> <mi>i</mi> <mi>s</mi> </msub> <mo>+</mo> <msub> <mi>j&amp;omega;</mi> <mi>s</mi> </msub> <msub> <mi>&amp;psi;</mi> <mi>s</mi> </msub> <mo>+</mo> <mfrac> <mrow> <msub> <mi>d&amp;psi;</mi> <mi>s</mi> </msub> </mrow> <mrow> <mi>d</mi> <mi>t</mi> </mrow> </mfrac> </mrow>
    <mrow> <msub> <mi>u</mi> <mi>r</mi> </msub> <mo>=</mo> <msub> <mi>R</mi> <mi>r</mi> </msub> <msub> <mi>i</mi> <mi>r</mi> </msub> <mo>+</mo> <msub> <mi>j&amp;omega;</mi> <mi>p</mi> </msub> <msub> <mi>&amp;psi;</mi> <mi>r</mi> </msub> <mo>+</mo> <mfrac> <mrow> <msub> <mi>d&amp;psi;</mi> <mi>r</mi> </msub> </mrow> <mrow> <mi>d</mi> <mi>t</mi> </mrow> </mfrac> </mrow>
    ψs=Lsis+Lmir
    ψr=Lmis+Lrir
    Wherein：U, i, R, L, ψ represent voltage, electric current, resistance, inductance and magnetic linkage respectively；Subscript s and r represent stator winding respectively And rotor windings；Ls=Lsσ-Lm、Lr=Lrσ-Lm, LsσAnd LrσStator leakage inductance and rotor leakage inductance are represented respectively；LmRepresent excitatory electricity Sense；ωpFor slip angular frequency；ωsAnd ωrSynchronous angular velocity and angular rate are represented respectively；T represents the time；
    Step 3-2, maximum short circuit current during failure is determined, is specially：
    Assuming that double-fed blower fan generator terminal three-phase shortcircuit occurred at the t=0 moment, and work as t=0+Moment crow bar is put into, the short circuit electricity of stator Flow and be：
    <mfenced open = "" close = ""> <mtable> <mtr> <mtd> <mrow> <msubsup> <mi>i</mi> <mrow> <mi>s</mi> <mi>a</mi> </mrow> <mo>&amp;prime;</mo> </msubsup> <mo>=</mo> <mfrac> <mrow> <mo>(</mo> <mn>1</mn> <mo>-</mo> <msub> <mi>K</mi> <mi>d</mi> </msub> <mo>)</mo> <msub> <mi>U</mi> <mrow> <mi>s</mi> <mn>0</mn> </mrow> </msub> </mrow> <mrow> <msub> <mi>j&amp;omega;</mi> <mi>s</mi> </msub> <msubsup> <mi>L</mi> <mi>s</mi> <mo>&amp;prime;</mo> </msubsup> </mrow> </mfrac> <mi>cos</mi> <mrow> <mo>(</mo> <msub> <mi>&amp;omega;</mi> <mi>s</mi> </msub> <mi>t</mi> <mo>+</mo> <mi>&amp;alpha;</mi> <mo>)</mo> </mrow> <mo>+</mo> <mfrac> <mrow> <msub> <mi>K</mi> <mi>d</mi> </msub> <msub> <mi>U</mi> <mrow> <mi>s</mi> <mn>0</mn> </mrow> </msub> </mrow> <mrow> <msub> <mi>j&amp;omega;</mi> <mi>s</mi> </msub> <msubsup> <mi>L</mi> <mi>s</mi> <mo>&amp;prime;</mo> </msubsup> </mrow> </mfrac> <msup> <mi>e</mi> <mrow> <mo>-</mo> <mi>t</mi> <mo>/</mo> <msub> <mi>&amp;tau;</mi> <mi>s</mi> </msub> </mrow> </msup> <mi>cos</mi> <mi>&amp;alpha;</mi> <mo>-</mo> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <mfrac> <mn>1</mn> <mrow> <msub> <mi>j&amp;omega;</mi> <mi>s</mi> </msub> <msubsup> <mi>L</mi> <mi>s</mi> <mo>&amp;prime;</mo> </msubsup> </mrow> </mfrac> <mo>&amp;lsqb;</mo> <msub> <mi>U</mi> <mrow> <mi>s</mi> <mn>0</mn> </mrow> </msub> <mo>-</mo> <mrow> <mo>(</mo> <msub> <mi>R</mi> <mrow> <mi>C</mi> <mi>B</mi> </mrow> </msub> <mo>+</mo> <msub> <mi>j&amp;omega;</mi> <mi>s</mi> </msub> <msubsup> <mi>L</mi> <mi>s</mi> <mo>&amp;prime;</mo> </msubsup> <mo>)</mo> </mrow> <msub> <mi>L</mi> <mrow> <mi>s</mi> <mn>0</mn> </mrow> </msub> <mo>&amp;rsqb;</mo> <mi>cos</mi> <mrow> <mo>(</mo> <msub> <mi>&amp;omega;</mi> <mi>s</mi> </msub> <mi>t</mi> <mo>+</mo> <mi>&amp;alpha;</mi> <mo>)</mo> </mrow> <msup> <mi>e</mi> <mrow> <mo>-</mo> <mi>t</mi> <mo>/</mo> <msub> <mi>&amp;tau;</mi> <mi>r</mi> </msub> </mrow> </msup> </mrow> </mtd> </mtr> </mtable> </mfenced>
    Wherein：For stator side Voltage Drop coefficient；Us0For the stator side set end voltage before failure；Us1For failure Stator side set end voltage afterwards；τs=L's/RsAnd τr=L'r/(Rr+ RCB)；Is0For the stator current before failure；Stator current initial angle when α is failure；
    In the case of considering most serious, α=0, KdThe instantaneous maximum of=1, A phase short circuit current is：
    <mrow> <msubsup> <mi>i</mi> <mrow> <mi>s</mi> <mi>a</mi> <mi>m</mi> <mi>a</mi> <mi>x</mi> </mrow> <mo>&amp;prime;</mo> </msubsup> <mo>=</mo> <mfrac> <msub> <mi>U</mi> <mrow> <mi>s</mi> <mn>0</mn> </mrow> </msub> <mrow> <msub> <mi>j&amp;omega;</mi> <mi>s</mi> </msub> <msubsup> <mi>L</mi> <mi>s</mi> <mo>&amp;prime;</mo> </msubsup> </mrow> </mfrac> <msup> <mi>e</mi> <mrow> <mo>-</mo> <mi>T</mi> <mo>/</mo> <mn>2</mn> <msub> <mi>&amp;tau;</mi> <mi>s</mi> </msub> </mrow> </msup> <mo>-</mo> <mfrac> <mn>1</mn> <mrow> <msub> <mi>j&amp;omega;</mi> <mi>s</mi> </msub> <msubsup> <mi>L</mi> <mi>s</mi> <mo>&amp;prime;</mo> </msubsup> </mrow> </mfrac> <mo>&amp;lsqb;</mo> <msub> <mi>U</mi> <mrow> <mi>s</mi> <mn>0</mn> </mrow> </msub> <mo>-</mo> <mrow> <mo>(</mo> <msub> <mi>R</mi> <mrow> <mi>C</mi> <mi>B</mi> </mrow> </msub> <mo>+</mo> <msub> <mi>j&amp;omega;</mi> <mi>s</mi> </msub> <msubsup> <mi>L</mi> <mi>s</mi> <mo>&amp;prime;</mo> </msubsup> <mo>)</mo> </mrow> <msub> <mi>I</mi> <mrow> <mi>s</mi> <mn>0</mn> </mrow> </msub> <mo>&amp;rsqb;</mo> <msup> <mi>e</mi> <mrow> <mo>-</mo> <mi>T</mi> <mo>/</mo> <mn>2</mn> <msub> <mi>&amp;tau;</mi> <mi>r</mi> </msub> </mrow> </msup> </mrow>
    Wherein：T is 0.02s；
    Step 3-3, the equiva lent impedance of double-fed blower fan is determined by the instantaneous maximum of short circuit current, formula used is：
    <mrow> <msub> <mi>X</mi> <mrow> <mi>D</mi> <mi>F</mi> <mi>I</mi> <mi>G</mi> </mrow> </msub> <mo>=</mo> <mfrac> <mn>1</mn> <msubsup> <mi>i</mi> <mrow> <mi>s</mi> <mi>a</mi> <mi>max</mi> </mrow> <mo>&amp;prime;</mo> </msubsup> </mfrac> <mo>.</mo> </mrow>
  5. 5. the wind field of blower fan containing double-fed current collection line current fast tripping protection fixed value adjusting method according to claim 1, it is special Sign is that step 4 carries out fixed value calculation to current collection line current fast tripping protection, and formula used is：
    Wherein, KrelFor safety factor, 1.1 are taken；For the maximum short circuit current of first case low pressure side failure；XSFor system most System impedance under the big method of operation；XTFor the impedance of main transformer；XLTo collect antenna impedance；X∑For double-fed blower fan, box change and current collection The comprehensive impedance of line；XCase TFor the impedance of box change；nTAFor current transformer ratio.
CN201710767863.5A 2017-08-31 2017-08-31 A kind of wind field current collection line current fast tripping protection fixed value adjusting method of blower fan containing double-fed Pending CN107492872A (en)

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Application publication date: 20171219