CN107221958A - A kind of wind power generating set backup power system capacity determining methods - Google Patents
A kind of wind power generating set backup power system capacity determining methods Download PDFInfo
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Abstract
The invention discloses a kind of wind power generating set backup power system capacity determining methods, including step：1) wind power plant receives money, including wind power plant current collection line connecting relation figure and electric parameter, Wind turbines case become important technological parameters, Wind turbines yaw system important technological parameters；2) farm model is set up using MATLAB, emulation determines the active and reactive capacity of backup power system；3) according to the active reactive capacity of emulation, backup power system diesel generating set and shunt reactor capacity are determined；4) backup power system diesel generating set and shunt reactor model are set up using MATLAB；5) backup power system is emulated, checking Wind turbines yaw system and backup power system working condition.Accessed between can ensure that typhoon period using the inventive method after back-up source, wind power plant Wind turbines yaw system and back-up system are working properly, reduce system risk of input, while also improving the reliability of backup power system.
Description
Technical field
The present invention relates to the technical field of the Anti-Typhoon Wind turbines backup power system of wind power plant, refer in particular to one kind and be based on
MATLAB wind power generating set backup power system capacity determining methods.
Background technology
According to the natural environmental condition of many typhoons in coastal area, wind power plant Wind turbines need to be equipped with back-up source during typhoon
System carrys out the change of real-time tracking wind direction, to reduce the load of root of blade and tower bottom.
Existing centralized backup power system technical scheme mainly include diesel generating set, low-tension switch cabinet, boosting become,
Damping unit, shunt reactor, reactor connection transformer, system wiring sketch, as shown in Figure 1.The technical scheme is based on reason
System Working Principle and control strategy are elaborated by analysis, wind power plant and back-up system diesel generating set and parallel connection is not carried out
Reactor is modeled simulating, verifying.In order to improve system economy and reliability, the present invention proposes a kind of based on MATLAB's
Wind power generating set backup power system capacity determining methods, are sent out centralized wind power plant backup power system diesel oil by emulating
Group of motors and shunt reactor capacity are determined and verified that providing strong technology for theory analysis ensures.
The content of the invention
It is an object of the invention to the shortcoming and deficiency for overcoming prior art, there is provided a kind of wind-force hair based on MATLAB
Group of motors backup power system capacity determining methods, it is ensured that accessed between typhoon period after back-up source, the driftage of wind power plant Wind turbines
System and back-up system are working properly, reduce system risk of input, while also improving the reliability of backup power system.
To achieve the above object, technical scheme provided by the present invention is：A kind of wind power generating set backup power system
Capacity determining methods, comprise the following steps：
1) wind power plant receives money, including wind power plant current collection line connecting relation figure and electric parameter, Wind turbines case become main
Technical parameter, Wind turbines yaw system important technological parameters；
2) farm model is set up using MATLAB, emulation determines the active and reactive capacity of backup power system；
3) according to the active reactive capacity of emulation, determine that backup power system diesel generating set and shunt reactor hold
Amount；
4) backup power system diesel generating set and shunt reactor model are set up using MATLAB；
5) backup power system is emulated, checking Wind turbines yaw system and backup power system working condition.
In step 1) in, the wind power plant current collection line connecting relation figure is wind power plant circuit primary connection figure, clearly electricity
Cable segmentation model, length and blower fan node；The current collection circuit electric parameter includes cable model, length, unit resistance, list
Position inductance, specific capacitance；It is specified including rated capacity, rated voltage, primary side that the Wind turbines case becomes important technological parameters
Voltage, load loss, open circuit loss, connection group number, rated frequency, rated secondary voltage, short-circuit impedance or short-circuit voltage, sky
Carry electric current；The Wind turbines yaw system technical parameter refers to yaw motor electric parameter, including rated power, specified electricity
It is pressure, stator winding resistance, floating voltage, no-load current, open circuit loss, rated speed, rated frequency, iron loss, short-circuit voltage, short
Road electric current, short circuit loss.
In step 2) in, the farm model include wind power plant current collection circuit model, Wind turbines case varying model and partially
Navigate system model, it is determined that after wind power plant current collection circuit model, Wind turbines case varying model and yaw system model, according to step
1) the wind power plant current collection line connecting relation figure in carries out current collection connection, and becomes mould in respective nodes access Wind turbines case
Type and yaw system model, are built and complete farm model, and the corresponding wind-powered electricity generation of wind power plant plant-grid connection is simulated using ideal source
Field standby source access node, carries out capacity and determines emulation, active power and reactive power that record ideal source is exported；Wherein,
The specific feelings of the wind power plant current collection circuit model, Wind turbines case varying model and yaw system model are as follows：
A, wind power plant current collection circuit model
The mathematical modeling for collecting electric line is the equivalent circuit that circuit is represented with resistance, reactance, susceptance and conductance, and dividing has one
Font equivalent circuit, PI shapes equivalent circuit and T-shaped equivalent circuit；The in-line equivalent circuit is generally used for the short cable of circuit
Circuit, when line voltage distribution does not reach requirement, line admittance and conductance are ignored, therefore, only remaining resistance and reactance, electricity
Resistance reactance series connection just obtains in-line equivalent circuit；For middle or long line road, the influence of susceptance can not be ignored, generally using PI shapes etc.
Circuit or T-shaped equivalent circuit are imitated, wherein, the PI shapes equivalent circuit is that resistance reactance is connected as the base of in-line equivalent circuit
On plinth, the admittance of circuit is equally divided into two parts, the whole story two ends of circuit are connected in parallel on respectively；And T-shaped equivalent circuit be then by
The resistance of circuit and reactance are equally divided into two parts, and the both sides of circuit are connected on respectively, then in the line between increase node,
Admittance is in parallel on the line；
B, Wind turbines case varying model
Transformer uses T-shaped equivalent circuit in Electrical Motor, is distinguished by first side winding impedance and secondary side winding impedance
Circuit two ends are connected on, then increase node is connected in parallel on excitation impedance on circuit in centre；It is to subtract in power system computation
Excitation impedance, is moved to circuit power side by few node, and is represented with admittance, constitutes simplified T-shaped equivalent circuit；By equivalent circuit
Understand, two-winding transformer includes resistance RT, reactance XT, conductance GTWith susceptance BTFour equivalent parameters；Any transformer dispatches from the factory
When, manufacturer can all provide four parameters for representing other electrical characteristics on transformer nameplate or on delivery test book, that is, bear
Load-loss Pk, impedance voltage percentage value Uk%, open circuit loss P0, no-load current percentage value I0%；
Wind turbines case varying model uses MATLAB three-phase two-winding transformer models, and main skill is become according to Wind turbines case
Art parameter, R can be calculated by following formulaT、XT、GTAnd BTFour parameters, and then calculate Wind turbines case varying model input parameter,
Formula is as follows：
XT=Uk/100
GT=P0/Sn
BT=I0/100；
Rm=1/GT
Lm=1/BT
LT=XT
R1=0.6RT
R2=0.4RT
L1=0.5LT
L2=0.5LT
In formula, RTFor transformer resistance, SnFor transformer rated capacity, UnFor transformer rated voltage；PkIt is negative for transformer
Load-loss, namely short circuit loss；XTFor transformer reactance, UkFor transformer impedance drop, namely short-circuit voltage；GTFor transformer
Conductance, P0For transformer noload losses, BTFor transformer susceptance, I0For no-load transformer electric current, RmFor static exciter resistance, Lm
For static exciter inductance, LTFor the corresponding inductance of transformer reactance, R1、L1Respectively transformer first side winding resistance and electricity
Sense, R2、L2Respectively Circuit Fault on Secondary Transformer winding resistance and inductance；
C, yaw system model
Yaw system model is mainly yaw motor model, and the yaw motor of the yaw motor model is asynchronous motor,
Using MATLAB motors storehouse asynchronous motor, mode input parameter is rated power, rated line voltage, rated frequency, stator
Resistance and leakage inductance, rotor resistance and leakage inductance and magnetizing inductance；Obtained and turned by following formula according to the short-circuit parameter of motor and unloaded parameter
Sub- resistance, rotor leakage inductance and magnetizing inductance, formula are as follows：
Zk=V1/I1
Ls=Lr=Xs/(2πf)
Z0=V2/I2
Xm1=X0-Xs
Lm1=Xm1/(2πf)
In formula, P1For yaw motor short circuit loss, I1For yaw motor short circuit current flow, RkFor yaw motor short-circuit test electricity
Resistance, V1For yaw motor short-circuit voltage, ZkFor yaw motor short-circuit test impedance, XkFor yaw motor short-circuit test reactance, Xs、Xr
Respectively yaw motor stator reactance and rotor reactance, Ls、LrRespectively yaw motor stator inductance and inductor rotor, P2To be inclined
Avionics machine open circuit loss, I2For yaw motor no-load current, R0For yaw motor no-load test resistance, Z0It is unloaded for yaw motor
Test impedance, X0For yaw motor no-load test reactance, Xm1For yaw motor excitation reactance, Lm1For yaw motor magnetizing inductance,
PFeFor yaw motor iron loss, Rm1For yaw motor excitation resistance.
In step 3) in, the active power peak value P of ideal source outputsHold for backup power system diesel generating set
Amount, boosting varying capacity determines power factor to take to fit on this basisThen boosting varying capacity isAnd ideal source
The reactive power stabilizer value Q of outputsIt is then the capacity of backup power system reactive power compensator-shunt reactor；In MATLAB
Middle use inductance analogy reactor, by Q=U2/XL,XLQ is the reactive power of inductance in=ω L, formula, and U is inductance both end voltage,
XLFor induction reactance, L is inductance value, and π × 50 of ω=2 are electric angle frequency, can be counted in the case of known back-up source reactive power
Calculate the size for obtaining reactor；Wherein reactor connection transformer capacity can also take to fit according to shunt reactor capacity determines power
FactorThen reactor connection transformer capacity is
In step 4) in, set up diesel generating set, boosting changes, shunt reactor, reactor and connect transformer
MATLAB models, diesel generating set uses MATLAB Synchronous Machine Models.
In step 5) in, system emulation checking is carried out, step is as follows：
5.1) diesel generating set is directly connected to collection electric line, and the driven by engine rotor of diesel-driven generator is rotated, and is reached
To synchronous rotational speed；
5.2) exciting current is added to diesel-driven generator, generator boosting, current collection line voltage distribution slowly rises；
5.3) current collection line voltage distribution is reached near rated voltage, accesses the yaw system of packet, and yaw motor starts；
5.4) index that yaw motor normally starts is：Rotating speed reaches rated speed, and starting current is no more than rated current
2~5 times；If stability of voltage of wind power plant, along with yaw motor normally starts, then backup power system is working properly, partially
Boat system is working properly, verifies this concept feasible.
The present invention compared with prior art, has the following advantages that and beneficial effect：
1st, backup power system current collection circuit model, farm model are established, standby further determined that by emulation
Power-supply system diesel generating set and shunt reactor capacity, finally demonstrate Wind turbines driftage system under the backup power system
The acting characteristic of system, it is ensured that accessed between typhoon period after back-up source, Wind turbines yaw system and back-up system are working properly, subtract
Small system risk of input, while also improving the reliability of backup power system.
2nd, centralized wind power plant backup power system diesel generating set and shunt reactor capacity are carried out by emulating
It is determined that and checking, provide the guarantee of strong technology for theory analysis.
Brief description of the drawings
Fig. 1 is back-up source wiring sketch.
Fig. 2 is circuit PI type equivalent circuit diagrams.
Fig. 3 is MATLAB circuit PI models.
Fig. 4 is MATLAB circuit PI mode input parameter interfaces.
Fig. 5 is MATLAB three-phase two-winding transformer models.
Fig. 6 is MATLAB three-phase two-winding transformer mode input parameter interfaces.
Fig. 7 is MATLAB asynchronous motors.
Fig. 8 is MATLAB asynchronous motor input parameters interface.
Embodiment
With reference to specific embodiment, the invention will be further described.
The wind power generating set backup power system capacity determining methods that the present embodiment is provided, comprise the following steps：
1) wind power plant receives money, including wind power plant current collection line connecting relation figure and electric parameter, Wind turbines case become main
Technical parameter, Wind turbines yaw system important technological parameters；Wherein, wind power plant current collection line connecting relation figure refers to by wind-powered electricity generation
The wind power plant circuit primary connection figure that field designing institute provides, specifies cable segmentation model, length, blower fan node.
Current collection circuit electric parameter, see the table below 1.
The current collection circuit electric parameter of table 1
Wind turbines case becomes important technological parameters, see the table below 2.
The Wind turbines case of table 2 becomes important technological parameters
Wind turbines yaw system technical parameter refers to yaw motor electric parameter.Motor important technological parameters, see the table below 3.
The yaw motor electric parameter of table 3
| Rated power (W) | Pn | Rated speed (rpm) | n |
| Rated voltage (kV) | Vn | Rated frequency (Hz) | f |
| Stator winding resistance (Ω) | Rs | Iron loss (W) | PFe |
| Floating voltage (V) | V2 | Short-circuit voltage (V) | V1 |
| No-load current (A) | I2 | Short circuit current flow (A) | I1 |
| Open circuit loss (W) | P2 | Short circuit loss (W) | P1 |
2) farm model is set up using MATLAB, emulation determines the active and reactive capacity of backup power system；Wherein,
The farm model includes wind power plant current collection circuit model, Wind turbines case varying model and yaw system model, it is determined that wind
After Electric field collector circuit model, Wind turbines case varying model and yaw system model, according to step 1) in wind power plant collection electric wire
Road annexation figure carries out current collection connection, and accesses Wind turbines case varying model and yaw system model in respective nodes,
Build and complete farm model, the corresponding wind power plant standby source access node of wind power plant plant-grid connection is simulated using ideal source,
Carry out capacity and determine emulation, the active power and reactive power of record ideal source output；Wherein, the wind power plant collection electric line
The specific feelings of model, Wind turbines case varying model and yaw system model are as follows：
A, wind power plant current collection circuit model
The mathematical modeling for collecting electric line is the equivalent circuit that circuit is represented with resistance, reactance, susceptance and conductance, and dividing has one
Font equivalent circuit, PI shapes equivalent circuit and T-shaped equivalent circuit.In-line is generally used for the short cable run of circuit, works as line
When road voltage is not high, line admittance and conductance be can be ignored, therefore, only remaining resistance and reactance, and resistance reactance is connected
Just obtain in-line equivalent circuit.For middle or long line road, the influence of susceptance can not be ignored, and generally use PI shapes equivalent circuit or T
Shape equivalent circuit.PI shape equivalent circuits be by resistance reactance series connection be in-line equivalent circuit on the basis of, by the admittance of circuit
Two parts are equally divided into, the whole story two ends of circuit are connected in parallel on respectively.And T-shaped equivalent circuit is that the resistance of circuit and reactance are averaged
Be divided into two parts, the both sides of circuit be connected on respectively, then in the line between increase node, admittance is in parallel on the line.
Integrate electric line in this scheme as middle or long line road, for this circuit, because charging current is very important, it is therefore desirable to
Consider distribution capacity, using PI type equivalent circuits, as shown in Figure 2.Z=R+jX=(r+j ω L) l is the total series impedance of circuit,
Wherein r is every phase resistance of circuit unit length, and L is every phase inductance of circuit unit length.Y=(g+j ω C) l is that circuit is total
Shunt admittance, under normal circumstances g can ignore, i.e. g=0.C is the direct-to-ground capacitance of circuit unit length, and l is line length.
Wind power plant current collection circuit model uses the circuit PI models that MATLAB is provided, as shown in figure 3, circuit model input parameter interface is such as
Shown in Fig. 4, the current collection circuit electric parameter of table 1 is inputted.
B, Wind turbines case varying model
Transformer uses T-shaped equivalent circuit in Electrical Motor, is distinguished by first side winding impedance and secondary side winding impedance
Circuit two ends are connected on, then increase node is connected in parallel on excitation impedance on circuit in centre.It is to subtract in power system computation
Excitation impedance, is moved to circuit power side by few node, and is represented with admittance, constitutes simplified T-shaped equivalent circuit.By equivalent circuit
Understand, two-winding transformer is by resistance RT, reactance XT, conductance GTWith susceptance BTFour equivalent parameters.When any transformer dispatches from the factory,
Manufacturer can all provide four parameters for representing other electrical characteristics on transformer nameplate or on delivery test book, i.e. load is damaged
Consume (short circuit loss) Pk, impedance voltage (short-circuit voltage) percentage value Uk%, open circuit loss P0, no-load current percentage value I0%.
Wind turbines case varying model uses MATLAB three-phase two-winding transformer models, as shown in Figure 5.According to the wind of table 2
Group of motors case becomes important technological parameters, and R can be calculated by following formulaT、XT、GTAnd BTFour parameters, and then calculate Wind turbines case
Varying model input parameter (perunit value become using case under rated value), wherein, mode input parameter (is become under rated value using case
Perunit value) interface is as shown in Figure 6.
XT=Uk/100
GT=P0/Sn
BT=I0/100；
Rm=1/GT
Lm=1/BT
LT=XT
R1=0.6RT
R2=0.4RT
L1=0.5LT
L2=0.5LT
In formula, RTFor transformer resistance, SnFor transformer rated capacity, UnFor transformer rated voltage, PkIt is negative for transformer
Load-loss (short circuit loss), XTFor transformer reactance, UkFor transformer impedance drop (short-circuit voltage), GTFor transformer conductance, P0
For transformer noload losses, BTFor transformer susceptance, I0For no-load transformer electric current, RmFor static exciter resistance, LmFor transformation
Device magnetizing inductance, LTFor the corresponding inductance of transformer reactance, R1、L1Respectively transformer first side winding resistance and inductance, R2、L2
Respectively Circuit Fault on Secondary Transformer winding resistance and inductance.
C, yaw system model
Yaw system model is mainly yaw motor model, and yaw motor is asynchronous motor, can use MATLAB motors
Storehouse asynchronous motor, as shown in Figure 7.Mode input parameter is rated power, rated line voltage, rated frequency, stator resistance
With leakage inductance, rotor resistance and leakage inductance and magnetizing inductance, mode input parameter interface is as shown in Figure 8.Pass through the short circuit ginseng of the motor of table 3
Number and unloaded parameter can obtain rotor resistance, rotor leakage inductance and magnetizing inductance by following formula.
Zk=V1/I1
Ls=Lr=Xs/(2πf)
Z0=V2/I2
Xm1=X0-Xs
Lm1=Xm1/(2πf)
In formula, P1For yaw motor short circuit loss, I1For yaw motor short circuit current flow, RkFor yaw motor short-circuit test electricity
Resistance, V1For yaw motor short-circuit voltage, ZkFor yaw motor short-circuit test impedance, XkFor yaw motor short-circuit test reactance, Xs、Xr
Respectively yaw motor stator reactance and rotor reactance, Ls、LrRespectively yaw motor stator inductance and inductor rotor, P2To be inclined
Avionics machine open circuit loss, I2For yaw motor no-load current, R0For yaw motor no-load test resistance, V2It is unloaded for yaw motor
Voltage, Z0For yaw motor no-load test impedance, X0For yaw motor no-load test reactance, Xm1For yaw motor excitation reactance,
Lm1For yaw motor magnetizing inductance, PFeFor yaw motor iron loss, Rm1For yaw motor excitation resistance.
3) according to the active reactive capacity of emulation, determine that backup power system diesel generating set and shunt reactor hold
Amount；Wherein, the active power peak value P of ideal source outputsFor backup power system diesel-driven generator pool-size, boost varying capacity
Determine power factor to take to fit on this basisThen boosting varying capacity isThe reactive power of ideal source output
Stationary value QsIt is then the capacity of backup power system reactive power compensator-shunt reactor.Inductance analogy is used in MATLAB
Reactor, by Q=U2/XL,XLQ is the reactive power of inductance in=ω L, formula, and U is inductance both end voltage, XLFor induction reactance, L is electricity
Sensibility reciprocal, π × 50 of ω=2 are electric angle frequency, can be calculated in the case of known back-up source reactive power and obtain reactor
Size.Reactor connection transformer capacity can also take to fit according to shunt reactor capacity determines power factorThen reactor connects
Connecing transformer capacity is
4) backup power system diesel generating set and shunt reactor model are set up using MATLAB, is specifically：Set up
Diesel generating set, boosting change, shunt reactor, the MATLAB models of reactor connection transformer, diesel generating set are used
MATLAB Synchronous Machine Models.
5) backup power system is emulated, checking Wind turbines yaw system and backup power system working condition, and step is such as
Under：
5.1) diesel generating set is directly connected to collection electric line, and the driven by engine rotor of diesel-driven generator is rotated, and is reached
To synchronous rotational speed；
5.2) exciting current is added to diesel-driven generator, generator boosting, current collection line voltage distribution slowly rises；
5.3) current collection line voltage distribution is reached near rated voltage, accesses the yaw system of packet, and yaw motor starts；
5.4) index that yaw motor normally starts is：Rotating speed reaches rated speed, and starting current is no more than rated current
2~5 times.If stability of voltage of wind power plant, yaw motor normally starts, then backup power system is working properly, yaw system
It is working properly, verify this concept feasible.
Examples of implementation described above are only the preferred embodiments of the invention, and the implementation model of the present invention is not limited with this
Enclose, therefore the change that all shape, principles according to the present invention are made, it all should cover within the scope of the present invention.
Claims (6)
1. a kind of wind power generating set backup power system capacity determining methods, it is characterised in that comprise the following steps：
1) wind power plant receives money, including wind power plant current collection line connecting relation figure and electric parameter, Wind turbines case become major technique
Parameter, Wind turbines yaw system important technological parameters；
2) farm model is set up using MATLAB, emulation determines the active and reactive capacity of backup power system；
3) according to the active reactive capacity of emulation, backup power system diesel generating set and shunt reactor capacity are determined；
4) backup power system diesel generating set and shunt reactor model are set up using MATLAB；
5) backup power system is emulated, checking Wind turbines yaw system and backup power system working condition.
2. a kind of wind power generating set backup power system capacity determining methods according to claim 1, it is characterised in that：
In step 1) in, the wind power plant current collection line connecting relation figure is wind power plant circuit primary connection figure, specifies cable sectional type
Number, length and blower fan node；The current collection circuit electric parameter include cable model, length, unit resistance, unit inductance,
Specific capacitance；The Wind turbines case become important technological parameters include rated capacity, it is rated voltage, rated primary voltage, negative
Load-loss, open circuit loss, connection group number, rated frequency, rated secondary voltage, short-circuit impedance or short-circuit voltage, no-load current；
The Wind turbines yaw system technical parameter refers to yaw motor electric parameter, including rated power, rated voltage, stator around
It is group resistance, floating voltage, no-load current, open circuit loss, rated speed, rated frequency, iron loss, short-circuit voltage, short circuit current flow, short
Path loss consumes.
3. a kind of wind power generating set backup power system capacity determining methods according to claim 1, it is characterised in that：
In step 2) in, the farm model includes wind power plant current collection circuit model, Wind turbines case varying model and yaw system mould
Type, it is determined that after wind power plant current collection circuit model, Wind turbines case varying model and yaw system model, according to step 1) in wind
Electric field collector line connecting relation figure carries out current collection connection, and accesses Wind turbines case varying model and driftage in respective nodes
System model, is built and completes farm model, and the corresponding wind power plant standby source of wind power plant plant-grid connection is simulated using ideal source
Access node, carries out capacity and determines emulation, the active power and reactive power of record ideal source output；Wherein, the wind-powered electricity generation
The specific feelings of field current collection circuit model, Wind turbines case varying model and yaw system model are as follows：
A, wind power plant current collection circuit model
The mathematical modeling for collecting electric line is the equivalent circuit that circuit is represented with resistance, reactance, susceptance and conductance, and dividing has in-line
Equivalent circuit, PI shapes equivalent circuit and T-shaped equivalent circuit；The in-line equivalent circuit is generally used for the short cable of circuit
Road, when line voltage distribution does not reach requirement, line admittance and conductance are ignored, therefore, only remaining resistance and reactance, resistance
Reactance series connection just obtains in-line equivalent circuit；For middle or long line road, the influence of susceptance can not be ignored, generally equivalent using PI shapes
Circuit or T-shaped equivalent circuit, wherein, the PI shapes equivalent circuit is that resistance reactance is connected as the basis of in-line equivalent circuit
On, the admittance of circuit is equally divided into two parts, the whole story two ends of circuit are connected in parallel on respectively；And T-shaped equivalent circuit is then by line
The resistance on road and reactance are equally divided into two parts, and the both sides of circuit are connected on respectively, then in the line between increase node, leading
Receive parallel connection on the line；
B, Wind turbines case varying model
Transformer uses T-shaped equivalent circuit in Electrical Motor, is connected respectively with secondary side winding impedance by first side winding impedance
At circuit two ends, then in centre, increase node is connected in parallel on excitation impedance on circuit；Saved in power system computation to reduce
Excitation impedance, is moved to circuit power side by point, and is represented with admittance, constitutes simplified T-shaped equivalent circuit；Can by equivalent circuit
Know, two-winding transformer includes resistance RT, reactance XT, conductance GTWith susceptance BTFour equivalent parameters；Any transformer dispatches from the factory
When, manufacturer can all provide four parameters for representing other electrical characteristics on transformer nameplate or on delivery test book, that is, bear
Load-loss Pk, impedance voltage percentage value Uk%, open circuit loss P0, no-load current percentage value I0%；
Wind turbines case varying model uses MATLAB three-phase two-winding transformer models, and major technique ginseng is become according to Wind turbines case
Number, R can be calculated by following formulaT、XT、GTAnd BTFour parameters, and then calculate Wind turbines case varying model input parameter, formula
It is as follows：
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</msubsup>
<mo>/</mo>
<msubsup>
<mi>S</mi>
<mi>n</mi>
<mn>2</mn>
</msubsup>
<mo>)</mo>
</mrow>
<mo>/</mo>
<mrow>
<mo>(</mo>
<msubsup>
<mi>U</mi>
<mi>n</mi>
<mn>2</mn>
</msubsup>
<mo>/</mo>
<msub>
<mi>S</mi>
<mi>n</mi>
</msub>
<mo>)</mo>
</mrow>
</mrow>
XT=Uk/100
GT=P0/Sn
BT=I0/100；
Rm=1/GT
Lm=1/BT
LT=XT
R1=0.6RT
R2=0.4RT
L1=0.5LT
L2=0.5LT
In formula, RTFor transformer resistance, SnFor transformer rated capacity, UnFor transformer rated voltage；PkDamaged for transformer load
Consumption, namely short circuit loss；XTFor transformer reactance, UkFor transformer impedance drop, namely short-circuit voltage；GTFor transformer conductance,
P0For transformer noload losses, BTFor transformer susceptance, I0For no-load transformer electric current, RmFor static exciter resistance, LmTo become
Depressor magnetizing inductance, LTFor the corresponding inductance of transformer reactance, R1、L1Respectively transformer first side winding resistance and inductance,
R2、L2Respectively Circuit Fault on Secondary Transformer winding resistance and inductance；
C, yaw system model
Yaw system model is mainly yaw motor model, and the yaw motor of the yaw motor model is asynchronous motor, is used
MATLAB motors storehouse asynchronous motor, mode input parameter is rated power, rated line voltage, rated frequency, stator resistance
With leakage inductance, rotor resistance and leakage inductance and magnetizing inductance；Rotor electricity is obtained by following formula according to the short-circuit parameter of motor and unloaded parameter
Resistance, rotor leakage inductance and magnetizing inductance, formula are as follows：
<mrow>
<msub>
<mi>R</mi>
<mi>k</mi>
</msub>
<mo>=</mo>
<msub>
<mi>P</mi>
<mn>1</mn>
</msub>
<mo>/</mo>
<mn>3</mn>
<msubsup>
<mi>I</mi>
<mn>1</mn>
<mn>2</mn>
</msubsup>
</mrow>
Zk=V1/I1
<mrow>
<msub>
<mi>X</mi>
<mi>k</mi>
</msub>
<mo>=</mo>
<msqrt>
<mrow>
<mo>(</mo>
<msubsup>
<mi>Z</mi>
<mi>k</mi>
<mn>2</mn>
</msubsup>
<mo>-</mo>
<msubsup>
<mi>R</mi>
<mi>k</mi>
<mn>2</mn>
</msubsup>
<mo>)</mo>
</mrow>
</msqrt>
</mrow>
<mrow>
<msub>
<mi>X</mi>
<mi>s</mi>
</msub>
<mo>=</mo>
<msub>
<mi>X</mi>
<mi>r</mi>
</msub>
<mo>=</mo>
<mfrac>
<mn>1</mn>
<mn>2</mn>
</mfrac>
<msub>
<mi>X</mi>
<mi>k</mi>
</msub>
</mrow>
Ls=Lr=Xs/(2πf)
<mrow>
<msub>
<mi>R</mi>
<mn>0</mn>
</msub>
<mo>=</mo>
<msub>
<mi>P</mi>
<mn>2</mn>
</msub>
<mo>/</mo>
<mn>3</mn>
<msubsup>
<mi>I</mi>
<mn>2</mn>
<mn>2</mn>
</msubsup>
</mrow>
Z0=V2/I2
<mrow>
<msub>
<mi>X</mi>
<mn>0</mn>
</msub>
<mo>=</mo>
<msqrt>
<mrow>
<msubsup>
<mi>Z</mi>
<mn>0</mn>
<mn>2</mn>
</msubsup>
<mo>-</mo>
<msup>
<msub>
<mi>R</mi>
<mn>0</mn>
</msub>
<mn>2</mn>
</msup>
</mrow>
</msqrt>
</mrow>
Xm1=X0-Xs
Lm1=Xm1/(2πf)
<mrow>
<msub>
<mi>R</mi>
<mrow>
<mi>m</mi>
<mn>1</mn>
</mrow>
</msub>
<mo>=</mo>
<msub>
<mi>P</mi>
<mrow>
<mi>F</mi>
<mi>e</mi>
</mrow>
</msub>
<mo>/</mo>
<mn>3</mn>
<msubsup>
<mi>I</mi>
<mn>2</mn>
<mn>2</mn>
</msubsup>
</mrow>
In formula, P1For yaw motor short circuit loss, I1For yaw motor short circuit current flow, RkFor yaw motor short-circuit test resistance, V1
For yaw motor short-circuit voltage, ZkFor yaw motor short-circuit test impedance, XkFor yaw motor short-circuit test reactance, Xs、XrRespectively
For yaw motor stator reactance and rotor reactance, Ls、LrRespectively yaw motor stator inductance and inductor rotor, P2For driftage electricity
Machine open circuit loss, I2For yaw motor no-load current, R0For yaw motor no-load test resistance, V2For yaw motor floating voltage,
Z0For yaw motor no-load test impedance, X0For yaw motor no-load test reactance, Xm1For yaw motor excitation reactance, Lm1To be inclined
Avionics machine magnetizing inductance, PFeFor yaw motor iron loss, Rm1For yaw motor excitation resistance.
4. a kind of wind power generating set backup power system capacity determining methods according to claim 1, it is characterised in that：
In step 3) in, the active power peak value P of ideal source outputsFor backup power system diesel-driven generator pool-size, boosting becomes
Capacity determines power factor to take to fit on this basisThen boosting varying capacity isAnd the nothing of ideal source output
Work(power stability value QsIt is then the capacity of backup power system reactive power compensator-shunt reactor；Using electricity in MATLAB
Emulating reactance device is felt, by Q=U2/XL,XLQ is the reactive power of inductance in=ω L, formula, and U is inductance both end voltage, XLFor sense
Anti-, L is inductance value, and π × 50 of ω=2 are electric angle frequency, can calculate and obtain in the case of known back-up source reactive power
The size of reactor；Wherein reactor connection transformer capacity can also take to fit according to shunt reactor capacity determines power factorThen reactor connection transformer capacity is
5. a kind of wind power generating set backup power system capacity determining methods according to claim 1, it is characterised in that：
In step 4) in, set up diesel generating set, boosting change, shunt reactor, the MATLAB models of reactor connection transformer, bavin
Fry dried food ingredients group of motors uses MATLAB Synchronous Machine Models.
6. a kind of wind power generating set backup power system capacity determining methods according to claim 1, it is characterised in that
In step 5) in, system emulation checking is carried out, step is as follows：
5.1) diesel generating set is directly connected to collection electric line, and the driven by engine rotor of diesel-driven generator is rotated, and is reached same
Walk rotating speed；
5.2) exciting current is added to diesel-driven generator, generator boosting, current collection line voltage distribution slowly rises；
5.3) current collection line voltage distribution is reached near rated voltage, accesses the yaw system of packet, and yaw motor starts；
5.4) index that yaw motor normally starts is：Rotating speed reaches rated speed, starting current no more than rated current 2~
5 times；If stability of voltage of wind power plant, along with yaw motor normally starts, then backup power system is working properly, yaw system
It is working properly, verify this concept feasible.
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| CN205489783U (en) * | 2016-01-12 | 2016-08-17 | 广东明阳风电产业集团有限公司 | Anti -Typhoon reserve electrical power generating system of wind generating set |
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