CN107221958B - 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, comprising steps of 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 established using MATLAB, emulates the active and reactive capacity for determining 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 established using MATLAB；5) backup power system emulates, and verifies Wind turbines yaw system and backup power system working condition.It can ensure that using the method for the present invention after accessing backup power supply between typhoon period, 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 fields of the Anti-Typhoon Wind turbines backup power system of wind power plant, refer in particular to one kind and are based on
The wind power generating set backup power system capacity determining methods of MATLAB.
Background technique
According to the natural environmental condition of the more typhoons in coastal area, wind power plant Wind turbines need to be equipped with backup power supply during typhoon
System carrys out the variation of real-time tracking wind direction, to reduce the load of root of blade and tower bottom.
It is existing centralization backup power system technical solution mainly include diesel generating set, low-tension switch cabinet, boosting become,
Damping unit, shunt reactor, reactor connection transformer, system wiring schematic diagram, as shown in Figure 1.The technical solution is based on reason
System Working Principle and control strategy are elaborated by analysis, do not carry out wind power plant and back-up system diesel generating set and parallel connection
Reactor carries out modeling and 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 send out centralized wind power plant backup power system diesel oil by emulation
Motor group and shunt reactor capacity are determined and verify, and provide strong technology for theory analysis and guarantee.
Summary of the invention
The purpose of the present invention is to overcome the shortcomings of the existing technology and deficiency, provides a kind of wind-force hair based on MATLAB
Motor group backup power system capacity determining methods, it is ensured that after accessing backup power supply between typhoon period, the yaw 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, a kind of technical solution provided by the present invention are as follows: wind power generating set backup power system
Capacity determining methods, comprising 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 established using MATLAB, emulates the active and reactive capacity for determining 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 established using MATLAB；
5) backup power system emulates, and verifies Wind turbines yaw system and backup power system working condition.
In step 1), the wind power plant current collection line connecting relation figure is wind power plant route primary connection figure, clear electricity
Cable is segmented model, length and blower node；The current collection route electric parameter includes cable model, length, unit resistance, list
Position inductance, specific capacitance；It includes that rated capacity, voltage rating, primary side are specified that the Wind turbines case, which becomes important technological parameters,
Voltage, no-load loss, is coupled group number, rated frequency, rated secondary voltage, short-circuit impedance or short-circuit voltage, sky at load loss
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, no-load loss, rated speed, rated frequency, iron loss, short-circuit voltage, short
Road electric current, short circuit loss.
In step 2), the farm model include wind power plant current collection circuit model, Wind turbines case varying model and partially
Navigate system model, after determining 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, build and complete farm model, simulate the corresponding wind-powered electricity generation of wind power plant plant-grid connection using ideal source
Field standby source access node carries out capacity and determines emulation, the active power and reactive power that record ideal source exports；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 model for collecting electric line is the equivalent circuit that route is indicated with resistance, reactance, susceptance and conductance, and dividing has one
Font equivalent circuit, PI shape equivalent circuit and T shape equivalent circuit；The linear type equivalent circuit cable short commonly used in route
Route, 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 linear type equivalent circuit；For middle or long line road, the influence of susceptance cannot be ignored, and generally use PI shape etc.
Imitate circuit or T shape equivalent circuit, wherein the PI shape equivalent circuit is resistance reactance to be connected for the base of linear type equivalent circuit
On plinth, the admittance of route is equally divided into two parts, is connected in parallel on the whole story both ends of route respectively；And T shape equivalent circuit be then by
The resistance of route and reactance are equally divided into two parts, are connected on the two sides of route respectively, then in the line between increase node,
Admittance parallel connection is on the line；
B, Wind turbines case varying model
Transformer uses T shape equivalent circuit in Electrical Motor, is distinguished by first side winding impedance and secondary side winding impedance
Route both ends are connected on, then increases node in centre and excitation impedance is connected in parallel on circuit；It is to subtract in power system computation
Excitation impedance, is moved to circuit power side, and indicated with admittance, constitutes simplified T shape equivalent circuit by few node；By equivalent circuit
It is found that two-winding transformer includes resistance RT, reactance XT, conductance GTWith susceptance BTFour equivalent parameters；Any transformer factory
When, manufacturer can all provide four parameters for representing other electrical characteristics on transformer nameplate or on delivery test book, i.e., negative
Load-loss Pk, impedance voltage percentage value Uk%, no-load loss P0, no-load current percentage value I0%；
Wind turbines case varying model uses MATLAB three-phase two-winding transformer model, becomes main skill according to Wind turbines case
Art parameter can calculate R by following formulaT、XT、GTAnd BTFour parameters, and then calculate Wind turbines case varying model and 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 voltage rating；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 primary 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 motor library 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；It is found out and is 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, 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, P2It is inclined
Avionics machine no-load loss, I2For yaw motor no-load current, R0For yaw motor no-load test resistance, Z0For yaw motor zero 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.
In step 3), the active power peak value P of ideal source outputsFor backup power system diesel generating set appearance
Amount, boosting varying capacity are to take to fit on this basis to determine power factorThe varying capacity that then boosts isAnd desired electrical
The reactive power stabilizer value Q of source outputsIt is then backup power system reactive power compensator-shunt reactor capacity；?
Inductance analogy reactor is used in MATLAB, by Q=U2/XL,XL=ω L, Q is the reactive power of inductance in formula, and U is inductance two
Hold voltage, XLFor induction reactance, L is inductance, and π × 50 ω=2 are electric angle frequency, in the case where known backup power supply reactive power
The size of reactor can be calculated；Wherein reactor connection transformer capacity can also take suitable according to shunt reactor capacity
Determine power factorThen reactor connection transformer capacity is
In step 4), diesel generating set is established, boosting changes, shunt reactor, reactor connect transformer
MATLAB model, diesel generating set use MATLAB Synchronous Machine Models.
In step 5), system emulation verifying is carried out, steps are as follows:
5.1) diesel generating set is directly connected to collection electric line, and the driven by engine rotor rotation of diesel-driven generator reaches
To synchronous rotational speed；
5.2) exciting current, generator boosting is added to diesel-driven generator, current collection line voltage distribution slowly rises；
5.3) current collection line voltage distribution reaches near voltage rating, accesses the yaw system of grouping, yaw motor starting；
5.4) index that yaw motor normally starts is: revolving 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.
Compared with prior art, the present invention have the following advantages that with the utility model has the advantages that
1, backup power system current collection circuit model, farm model are established, standby further determined by emulation
Power-supply system diesel generating set and shunt reactor capacity finally demonstrate Wind turbines yaw system under the backup power system
The acting characteristic of system, it is ensured that after accessing backup power supply between typhoon period, 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.
2, centralized wind power plant backup power system diesel generating set and shunt reactor capacity are carried out by emulation
It determines and verifies, provide strong technology for theory analysis and guarantee.
Detailed description of the invention
Fig. 1 is backup power supply wiring schematic diagram.
Fig. 2 is route PI type equivalent circuit diagram.
Fig. 3 is MATLAB route PI model.
Fig. 4 is MATLAB route PI mode input parameter interface.
Fig. 5 is MATLAB three-phase two-winding transformer model.
Fig. 6 is MATLAB three-phase two-winding transformer mode input parameter interface.
Fig. 7 is MATLAB asynchronous motor.
Fig. 8 is that MATLAB asynchronous motor inputs parameter interface.
Specific embodiment
The present invention is further explained in the light of specific embodiments.
Wind power generating set backup power system capacity determining methods provided by the present embodiment, comprising 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 route primary connection figure that field designing institute provides specifies cable segmentation model, length, blower node.
Current collection route electric parameter, see the table below 1.
1 current collection route electric parameter of table
Wind turbines case becomes important technological parameters, see the table below 2.
2 Wind turbines case of table 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。
3 yaw motor electric parameter of table
| Rated power (W) | Pn | Rated speed (rpm) | n |
| Voltage rating (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 (A) | I1 |
| No-load loss (W) | P2 | Short circuit loss (W) | P1 |
2) farm model is established using MATLAB, emulates the active and reactive capacity for determining backup power system；Wherein,
The farm model includes wind power plant current collection circuit model, Wind turbines case varying model and yaw system model, is determining wind
After Electric field collector circuit model, Wind turbines case varying model and yaw system model, according to the wind power plant collection electric wire in step 1)
Road annexation figure carries out current collection connection, and accesses Wind turbines case varying model and yaw system model in respective nodes,
It builds and completes farm model, wind power plant plant-grid connection corresponding wind power plant standby source access node is simulated using ideal source,
It carries out capacity and determines 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 model for collecting electric line is the equivalent circuit that route is indicated with resistance, reactance, susceptance and conductance, and dividing has one
Font equivalent circuit, PI shape equivalent circuit and T shape equivalent circuit.Linear type is generally used for the short cable run of route, works as line
When road voltage is not high, line admittance and conductance be can be ignored, and therefore, resistance reactance is connected in only remaining resistance and reactance
Just obtain linear type equivalent circuit.For middle or long line road, the influence of susceptance cannot be ignored, and generally use PI shape equivalent circuit or T
Shape equivalent circuit.PI shape equivalent circuit is that resistance reactance is connected on the basis of linear type equivalent circuit, by the admittance of route
Two parts are equally divided into, are connected in parallel on the whole story both ends of route respectively.And T shape equivalent circuit is that the resistance of route and reactance are averaged
Be divided into two parts, be connected on the two sides of route respectively, then in the line between increase node, on the line admittance parallel connection.
Integrate electric line in this scheme as middle or long line road, for this route, since charging current is very important, it is therefore desirable to
Consider distribution capacity, using PI type equivalent circuit, as shown in Figure 2.Z=R+jX=(r+j ω L) l is the total series impedance of route,
Wherein r is every phase resistance of route unit length, and L is every phase inductance of route unit length.Y=(g+j ω C) l is that route is total
Shunt admittance, g can ignore under normal circumstances, i.e. g=0.C is the direct-to-ground capacitance of route unit length, and l is line length.
The route PI model that wind power plant current collection circuit model uses MATLAB to provide, as shown in figure 3, circuit model input parameter interface is such as
Shown in Fig. 4, the current collection route electric parameter of table 1 is inputted.
B, Wind turbines case varying model
Transformer uses T shape equivalent circuit in Electrical Motor, is distinguished by first side winding impedance and secondary side winding impedance
Route both ends are connected on, then increases node in centre and excitation impedance is connected in parallel on circuit.It is to subtract in power system computation
Excitation impedance, is moved to circuit power side, and indicated with admittance, constitutes simplified T shape equivalent circuit by few node.By equivalent circuit
It is found that 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 damage
Consume (short circuit loss) Pk, impedance voltage (short-circuit voltage) percentage value Uk%, no-load loss P0, no-load current percentage value I0%.
Wind turbines case varying model uses MATLAB three-phase two-winding transformer model, as shown in Figure 5.According to the wind of table 2
Electric set box becomes important technological parameters, can calculate R by following formulaT、XT、GTAnd BTFour parameters, and then calculate Wind turbines case
Varying model inputs parameter (becoming the per unit value under rated value using case), wherein mode input parameter (is become under rated value using case
Per unit 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 voltage rating, 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 primary 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, and MATLAB motor can be used
Library 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 3 motor of table
Several and unloaded parameter can find out 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, 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, P2It is inclined
Avionics machine no-load loss, I2For yaw motor no-load current, R0For yaw motor no-load test resistance, V2For yaw motor zero load
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
Power factor is determined to take to fit on this basisThe varying capacity that then boosts isThe reactive power of ideal source output
Stationary value QsIt is then backup power system reactive power compensator-shunt reactor capacity.Inductance analogy is used in MATLAB
Reactor, by Q=U2/XL,XL=ω L, Q is the reactive power of inductance in formula, and U is voltage across the inductor, XLFor induction reactance, L is electricity
Sensibility reciprocal, π × 50 ω=2 are electric angle frequency, and reactor can be calculated in the case where known backup power supply reactive power
Size.Reactor connection transformer capacity, which 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 established using MATLAB, specifically: establishing
Diesel generating set, boosting changes, shunt reactor, reactor connection transformer MATLAB model, diesel generating set use
MATLAB Synchronous Machine Models.
5) backup power system emulates, and verifies Wind turbines yaw system and backup power system working condition, step is such as
Under:
5.1) diesel generating set is directly connected to collection electric line, and the driven by engine rotor rotation of diesel-driven generator reaches
To synchronous rotational speed；
5.2) exciting current, generator boosting is added to diesel-driven generator, current collection line voltage distribution slowly rises；
5.3) current collection line voltage distribution reaches near voltage rating, accesses the yaw system of grouping, yaw motor starting；
5.4) index that yaw motor normally starts is: revolving 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.
The examples of implementation of the above are only the preferred embodiments of the invention, and implementation model of the invention is not limited with this
It encloses, therefore all shapes according to the present invention, changes made by principle, should all be included within the scope of protection of the present invention.
Claims (6)
1. a kind of wind power generating set backup power system capacity determining methods, which comprises the following steps:
1) wind power plant receives money, the technology ginseng become including wind power plant current collection line connecting relation figure and electric parameter, Wind turbines case
The technical parameter of number, Wind turbines yaw system；
2) farm model is established using MATLAB, emulates the active and reactive capacity for determining backup power system；Wherein, described
Farm model includes wind power plant current collection circuit model, Wind turbines case varying model and yaw system model, is determining wind power plant
After current collection circuit model, Wind turbines case varying model and yaw system model, connected according to the wind power plant collection electric line in step 1)
It connects relational graph and carries out current collection connection, and access Wind turbines case varying model and yaw system model in respective nodes, build
Farm model is completed, wind power plant plant-grid connection corresponding wind power plant standby source access node is simulated using ideal source, is carried out
Capacity determines emulation, the active power and reactive power of record ideal source output；
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 established using MATLAB；
5) backup power system emulates, and verifies 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), the wind power plant current collection line connecting relation figure is wind power plant route primary connection figure, specifies cable sectional type
Number, length and blower node；The current collection route electric parameter include cable model, length, unit resistance, unit inductance,
Specific capacitance；The technical parameter that the Wind turbines case becomes includes rated capacity, voltage rating, rated primary voltage, load
Loss, is coupled group number, rated frequency, rated secondary voltage, short-circuit impedance or short-circuit voltage, no-load current at no-load loss；Institute
It states Wind turbines yaw system technical parameter and refers to yaw motor electric parameter, including rated power, voltage rating, stator winding
Resistance, floating voltage, no-load current, no-load loss, rated speed, rated frequency, iron loss, short-circuit voltage, short circuit current, short circuit
Loss.
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), the concrete condition of the wind power plant current collection circuit model, Wind turbines case varying model and yaw system model is such as
Under:
A, wind power plant current collection circuit model
The mathematical model for collecting electric line is the equivalent circuit that route is indicated with resistance, reactance, susceptance and conductance, and dividing has linear type
Equivalent circuit, PI shape equivalent circuit and T shape equivalent circuit；The linear type equivalent circuit cable short commonly used in route
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 linear type equivalent circuit；For middle or long line road, the influence of susceptance cannot be ignored, and it is equivalent to generally use PI shape
Circuit or T shape equivalent circuit, wherein the PI shape equivalent circuit is resistance reactance to be connected for the basis of linear type equivalent circuit
On, the admittance of route is equally divided into two parts, is connected in parallel on the whole story both ends of route respectively；And T shape equivalent circuit is then by line
The resistance on road and reactance are equally divided into two parts, are connected on the two sides of route respectively, then in the line between increase node, leading
Receive parallel connection on the line；
B, Wind turbines case varying model
Transformer uses T shape equivalent circuit in Electrical Motor, is connected respectively by first side winding impedance with secondary side winding impedance
At route both ends, then increases node in centre and excitation impedance is connected in parallel on circuit；It is saved in power system computation to reduce
Excitation impedance is moved to circuit power side, and is indicated with admittance by point, constitutes simplified T shape equivalent circuit；It can by equivalent circuit
Know, two-winding transformer includes resistance RT, reactance XT, conductance GTWith susceptance BTFour equivalent parameters；Any transformer factory
When, manufacturer can all provide four parameters for representing other electrical characteristics on transformer nameplate or on delivery test book, i.e., negative
Load-loss Pk, impedance voltage percentage value Uk%, no-load loss P0, no-load current percentage value I0%；
Wind turbines case varying model uses MATLAB three-phase two-winding transformer model, is joined according to the technology that Wind turbines case becomes
Number, can calculate R by following formulaT、XT、GTAnd BTFour parameters, and then calculate Wind turbines case varying model and input parameter, formula
It 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 voltage rating；PkFor transformer load damage
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 primary winding resistance and inductance,
R2、L2Respectively Circuit Fault on Secondary Transformer winding resistance and inductance；
C, yaw system model
Yaw system model is yaw motor model, and the yaw motor of the yaw motor model is asynchronous motor, is used
MATLAB motor library asynchronous motor, mode input parameter are rated power, rated line voltage, rated frequency, stator resistance
With leakage inductance, rotor resistance and leakage inductance and magnetizing inductance；Rotor electricity is found out 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:
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, 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 yaw electricity
Machine no-load 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, Lm1It is 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), the active power peak value P of ideal source outputsFor backup power system diesel-driven generator pool-size, boosting becomes
Capacity is to take to fit on this basis to determine power factorThe varying capacity that then boosts isAnd the nothing of ideal source output
Function power stability value QsIt is then backup power system reactive power compensator-shunt reactor capacity；Using electricity in MATLAB
Emulating reactance device is felt, by Q=U2/XL,XL=ω L, Q is the reactive power of inductance in formula, and U is voltage across the inductor, XLFor sense
Anti-, L is inductance, and π × 50 ω=2 are electric angle frequency, can be calculated in the case where known backup power supply reactive power
The size of reactor；Wherein reactor connection transformer capacity, which 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), the MATLAB model of diesel generating set, boosting change, shunt reactor, reactor connection transformer, bavin are established
Oily generating set uses MATLAB Synchronous Machine Models.
6. a kind of wind power generating set backup power system capacity determining methods according to claim 1, which is characterized in that
In step 5), system emulation verifying is carried out, steps are as follows:
5.1) diesel generating set is directly connected to collection electric line, and the driven by engine rotor rotation of diesel-driven generator reaches same
Walk revolving speed；
5.2) exciting current, generator boosting is added to diesel-driven generator, current collection line voltage distribution slowly rises；
5.3) current collection line voltage distribution reaches near voltage rating, accesses the yaw system of grouping, yaw motor starting；
5.4) index that yaw motor normally starts is: revolving speed reaches rated speed, starting current be 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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| CN102589914A (en) * | 2012-02-01 | 2012-07-18 | 国电南瑞科技股份有限公司 | All-digital testbed for electric pitch control system of wind generating set |
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| CN102589914A (en) * | 2012-02-01 | 2012-07-18 | 国电南瑞科技股份有限公司 | All-digital testbed for electric pitch control system of wind generating set |
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