CN102024079A - Equivalent aggregation simulation method for electromagnetic transient simulation of large-scale wind farm - Google Patents
Equivalent aggregation simulation method for electromagnetic transient simulation of large-scale wind farm Download PDFInfo
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Abstract
The invention belongs to the field of a power system, and particularly relates to an equivalent aggregation simulation method for electromagnetic transient simulation of a large-scale wind farm. The invention provides an aggregation simulation method for simulating the large-scale wind farm by a single wind turbine and an ideal controlled current source according to the basal principle of an electromagnetic transient simulation algorithm of a power system and the characteristics of dynamic equations of a motor and a control system as well as an algebraic equation solving algorithm of an electric network. By adopting the equivalent aggregation simulation method for carrying out related research on synchronization of the large-scale wind farm, the complexity of modeling the large-scale wind farm can be reduced, and the modeling efficiency can be improved.
Description
Technical field
The invention belongs to field of power, be specifically related to the equivalent polymerization analogy method of a kind of large-scale wind electricity field electromagnetic transient simulation.
Background technology
Along with the deep enforcement of national energy-saving and emission-reduction policy, new forms of energy particularly wind energy will develop on a large scale.Different with the distributed dispersion access of external wind energy turbine set electrical network, China's wind-resources is concentrated relatively, areas such as southeastern coast, the north, Gansu, the north, Xinjiang, the Inner Mongol and Heilungkiang, northeast, Jilin and northern Hebei are the wind-resources close quarters, therefore the development and utilization of China's wind-powered electricity generation exploitation of will adopting on a large scale, intensify, the pattern sent outside of high capacity at a distance.In the intensive wind-powered electricity generation base of wind-resources, form some large-scale wind electricities field according to the geographic position usually, each large-scale wind electricity field then generally is made of the identical and numerous wind-powered electricity generation unit of model.Electrical network is inserted by adjacent or public transformer station in these large-scale wind electricity fields.
Meritorious intermittent wave characteristic and the reactive power consumption accompanying characteristics of exerting oneself in large-scale wind electricity field, the quality of power supply and voltage levvl that all can appreciable impact wind energy turbine set connecting system; Under the electric network fault disturbance, stable operation has material impact to large-scale wind electricity field low voltage ride-through capability to AC network; In addition, the high speed identical with wind farm grid-connected point, the impact load characteristic of heavily loaded traction station of electrical railroad also will be brought adverse influence to the reliability service of wind-powered electricity generation unit.In a word, along with the development and use of wind-powered electricity generation, concentrate the relevant research of access to become focus gradually with the large-scale wind electricity field.
Electromagnetic transient in power system emulation is the strong instrument of research large-scale wind electricity field to wind energy turbine set operation characteristic, wind energy turbine set operation control strategy under system power quality influence, the asymmetric operation state, but be subject to simulation calculation scale and speed, large-scale wind electricity field connecting system modeling process need carry out loaded down with trivial details data processing.At present the method that adopts mainly contains two kinds, and the first adopts unit or multimachine equivalence with wind energy turbine set, needs according to the actual start situation of wind energy turbine set wind-powered electricity generation unit, blower fan control system to be carried out parameter reduction under the specified conditions for this reason; It two is the unit simulation whole wind electric fields that adopt rated capacity, and according to the one pole rated capacity, the AC network parameter is carried out corresponding reduction.More than two kinds of methods all unavoidably to carry out loaded down with trivial details parameter reduction, calculated amount is big, efficient is low, and institute's established model is relatively poor to the adaptability of the wind energy turbine set method of operation.
Summary of the invention
The objective of the invention is to, the equivalent polymerization analogy method of a kind of large-scale wind electricity field electromagnetic transient simulation is provided.Dynamic equation and electric network algebraic equation solving algorithm characteristic according to electromagnetic transient in power system simulation algorithm principle and motor and control system, to wind-powered electricity generation unit model and all identical large-scale wind electricity field of control system, propose to add the polymerization analogy method of the dynamic perfromance of controlled ideal current source simulation large-scale wind electricity field with separate unit wind-powered electricity generation unit.
The equivalent polymerization analogy method of a kind of large-scale wind electricity of the present invention field electromagnetic transient simulation adopts separate unit wind-powered electricity generation unit to add the dynamic perfromance of desirable controlled current source simulation large-scale wind electricity field, may further comprise the steps:
(1) adopts the electromagnetic transient in power system emulation tool, at identical each the large-scale wind electricity field of unit composition form, foundation is the detailed realistic model of prime mover system, aerogenerator and the control system of benchmark with the single-machine capacity, extracts the current signal that this machine exports wind-electricity integration point to;
(2) with after N-1 times of this current signal amplification, wherein, N is a natural number, as wind-electricity integration point controlled current source current output value; This model can be used for simulating the large-scale wind electricity field with N typhoon group of motors; If system has a plurality of large-scale wind electricities field, all can carry out like this;
(3) set up the AC network model, connect each large-scale wind electricity field and AC network, wherein each component parameters of AC network all is taken as actual famous value, need not conversion;
(4) the large-scale wind electricity field variation characteristic of exerting oneself is provided with realization by separate unit blower fan relevant; The variation of wind energy turbine set start platform number then directly can realize by controlled current source current amplification factor N.
Wherein, further comprise following detailed step:
(1) the detailed modeling of separate unit grid connected wind power unit in the large-scale wind power field
Adopt the electromagnetic transient in power system emulation tool,, set up the detailed realistic model of separate unit wind-powered electricity generation unit, comprise the detailed realistic model of wind power system, aerogenerator and control system at the large-scale wind electricity field of forming by same type wind-powered electricity generation unit;
(2) a, b, c three-phase current signal i wind energy turbine set machine group assembly effect and site controlled current source analogy method extraction double-fed set grid-connection point circuit
Wa, i
Wb, i
Wc, and with this current signal amplification N-1 doubly, wherein N is and the corresponding natural coefficient of wind energy turbine set wind-powered electricity generation platform number; Insert desirable controlled current source at wind-electricity integration point, its a, b, each phase current values of c are the numerical value after electric current amplifies, and are shown below:
i
ca＝(N-1)×i
wa
i
cb＝(N-1)×i
wb
i
cc＝(N-1)×i
wc
In the formula, i
Wa, i
Wb, i
WcWith i
Ca, i
Cb, i
CcBe respectively wind-electricity integration point circuit electric current and desirable controlled current source electric current;
Utilize this model to simulate to have the large-scale wind electricity field of N platform wind-powered electricity generation unit of the same type; If system has a plurality of large-scale wind electricities field, all can simulate one by one like this;
(3) the AC network modeling strategy under the wind energy turbine set equivalence polymerization simulated conditions
According to real topology and synchronous alternating-current generator group, transformer capacity and the parameter of the large-scale wind electricity field access electrical network of being studied, set up the Simulation Calculation of wind energy turbine set connecting system, wherein:
5.. the lumped parameter of alternating current circuit or distribution parameter, all adopt actual famous value, need not unified reduction;
6.. the parameter of genset, adopting with the genset rated capacity is the perunit value parameter of benchmark;
7.. the parameter of transformer, taking with the transformer rated capacity is the perunit value parameter of benchmark;
8.. if contain opertaing device such as direct current in the system, its capacity and parameter all can be taken as actual value, need not to convert;
(4) wind energy turbine set equivalence polymerization simulated conditions leeward Electric Field Characteristics control method
Research large-scale wind electricity field power producing characteristics under different wind friction velocities comprises different mean wind speed conditions, different gradual change wind and fitful wind to the influence of system, and the wind power system of the separate unit blower fan by detailed modeling is achieved, and comprises and adjusts basic wind v among the resultant wind velocity v
Wb, fitful wind v
Wg, gradual change wind v
WrWith random noise wind v
WmSize and ratio.
Wherein, in the detailed modeling of separate unit grid connected wind power unit, the critical piece modeling process of doubly-fed variable-speed constant-frequency rate unit is as follows in the described large-scale wind power field:
1.. the wind power system
The simulation of wind power system comprises three parts: wind speed simulation system, wind wheel unit simulated behavior and blade angle control section, wind power system are output as aerogenerator input mechanical torque;
Dynamically wind speed can be simulated basic wind v
Wb, fitful wind v
Wg, gradual change wind v
Wr, random noise wind v
Wm, resultant wind velocity v is
v＝v
wb+v
wg+v
wr+v
wm
Cube proportional relation of wind energy that wind energy conversion system is caught and wind speed, also relevant with the rotating speed and the structural parameters of pneumatic equipment blades made simultaneously, wind energy conversion system output machine torque is:
Wherein, C
pBe wind energy conversion efficiency coefficient, it is slurry elongation β and the blade tip speed ratio λ (function of λ=R ω/v); R is a blade radius; ω is the pneumatic equipment blades made rotating speed; A is the blade swept area; ρ is an atmospheric density; V is a wind speed; P
NBe the power base value;
2.. aerogenerator
Wind power generating set adopts the squirrel-cage induction motor simulation, and aerogenerator can be interconnected with the external voltage source by the generator slip ring with different its rotor loops that just are of common asynchronous moter maximum, therefore, and its rotor voltage u
RdWith u
RqBe not equal to 0, by control rotor external voltage, can control the meritorious and reactive power of double fed induction generators, the voltage equation that rotates doubly fed induction generator under the dq0 coordinate system synchronously is:
U in the formula
Sd, u
Sq, u
Rd, u
RqBe respectively the d axle and the q axle component of stator winding and rotor winding voltage; R
sAnd R
rBe respectively stator winding and rotor winding phase resistance; i
Sd, i
Sq, i
Rd, i
RqBe respectively the d axle and the q axle component of stator winding and rotor winding; ω
NBe synchronous rotational speed; S is the rotor slippage; ψ
Sd, ψ
Sq, ψ
Rd, ψ
RqBe respectively the magnetic linkage of stator and rotor d axle and q axle;
The magnetic linkage equation of wind power generating set is:
ψ
sd＝(L
ss+L
m)i
sd+L
mi
rd
ψ
sq＝(L
ss+L
m)i
sq+L
mi
rq
ψ
rd＝(L
rr+L
m)i
rd+L
mi
sd
ψ
rq＝(L
rr+L
m)i
rq+L
mi
sq
Wherein, L
Ss, L
Rr, L
mBe respectively stator and the every leakage inductance mutually of rotor, and the mutual inductance between stator and rotor;
3.. blower fan control system
The double-fed fan motor unit control system is that stator side and rotor-side voltage source converter are controlled, and realizes the adjusting to unit performance and output power;
The blower fan control system model can be divided into two-layer, ground floor is wind energy conversion system wind energy acquisition control and wind-powered electricity generation unit Reactive Power Control, wind energy conversion system wind energy acquisition control detection rotor rotating speed, according to optimized rotating speed-powertrace, determine stator winding active power of output reference value so that the same wind speed of the wind energy that wind energy conversion system is caught-powertrace unanimity, Reactive Power Control is determined the idle reference value of wind-powered electricity generation unit according to the Reactive Power Control strategy; The second layer is power decoupled control, controls determined active power and reactive power reference qref is a controlled target with ground floor, realizes meritorious, the idle decoupling zero control of both sides transverter;
Wherein, in the large-scale wind electricity field, the machine of wind farm grid-connected generating is organized a performance to count and is changed, and N is achieved by the controlled current source current amplification factor;
The invention allows for a kind of method of studying the Whole Response characteristic of large-scale wind electricity field after the fault disturbance, it uses the equivalent polymerization analogy method of above-mentioned large-scale wind electricity field electromagnetic transient simulation.
Electromagnetic transient in power system emulation tool of the present invention is analyzed commercial packages as widely used PSCAD/EMTDC electro-magnetic transient by the D.C. high voltage transmission research centre exploitation of Canadian Manitoba university in the electric system, at
By the large-scale wind electricity field that same type wind-powered electricity generation unit is formed, set up the detailed realistic model of separate unit wind-powered electricity generation unit, comprise the detailed realistic model of wind power system, aerogenerator and control system.
The invention has the beneficial effects as follows:
Utilize this method can significantly simplify the complexity of large-scale wind electricity field electro-magnetic transient modeling, method possesses the dirigibility that adapts to the wind energy turbine set different running method, keeping can significantly improving simulation calculation efficient under the prerequisite of identical simulation calculation precision, solved large-scale wind electricity field and AC network influence each other study in the bottleneck problem of simulation scale and simulation velocity.
Description of drawings
Fig. 1: according to the wind farm grid-connected analogue system synoptic diagram that contains many typhoons group of motors of the present invention;
Fig. 2: according to wind power simulation system synoptic diagram of the present invention;
Fig. 3: according to doubly fed machine steering logic synoptic diagram of the present invention;
Fig. 4: according to the wind farm grid-connected equivalent injection current source analogue simulation system synoptic diagram that contains many typhoons group of motors of the present invention;
Fig. 5: according to the contrast synoptic diagram consuming time of blower fan realistic model of the present invention and equivalent current source emulation;
Fig. 6: according to the wind energy turbine set egress line three-phase current contrast synoptic diagram of two kinds of different analogue systems of the present invention;
Fig. 7: according to the wind energy turbine set outlet active power contrast synoptic diagram of two kinds of different analogue systems of the present invention;
Fig. 8: according to the wind energy turbine set outlet active power contrast synoptic diagram of two kinds of different analogue systems of the present invention;
Fig. 9: according to electric network resolution principle synoptic diagram among the electromagnetic transient simulation software PSCAD/EMTDC of the present invention;
Figure 10: according to generator and the mutual resolution principle synoptic diagram of electric network among the electromagnetic transient simulation software PSCAD/EMTDC of the present invention.
Embodiment
(1) adopts the electromagnetic transient in power system emulation tool, analyze commercial packages as widely used PSCAD/EMTDC electro-magnetic transient in the electric system by the D.C. high voltage transmission research centre exploitation of Canadian Manitoba university, at the large-scale wind electricity field of forming by same type wind-powered electricity generation unit, set up the detailed realistic model of separate unit wind-powered electricity generation unit, comprise the detailed realistic model of wind power system, aerogenerator and control system.As shown in Figure 1, utilize PSCAD/EMTDC software to set up the double-fed wind power generator group that comprises 4 identical settings.Its apoplexy power simulation system comprises that controlling three parts by dynamic wind speed simulation system, air impeller, blade angle forms, as shown in Figure 2; The control system of double-fed fan motor unit as shown in Figure 3, the active power of rotor-side VSC control wind-powered electricity generation unit output and reactive power, stator side VSC then control the transverter dc voltage and with the reactive power of AC network exchange
(2) at as shown in Figure 1 windy group of motors analogue system, can extract a, b, the c three-phase current signal of double-fed set grid-connection point circuit, and this current signal is amplified N-1 doubly, wherein N is and the corresponding natural coefficient of wind energy turbine set wind-powered electricity generation platform number; Insert desirable controlled current source at wind-electricity integration point, its a, b, each phase current of c are the numerical value after electric current amplifies, and are shown below:
i
ca＝(N-1)×i
wa
i
cb＝(N-1)×i
wb
i
cc＝(N-1)×i
wc
In the formula, i
Wa, i
Wb, i
WcWith i
Ca, i
Cb, i
CcBe respectively wind-electricity integration point circuit electric current and desirable controlled current source electric current.
Set up the equivalent analogue system of windy group of motors according to this method, as shown in Figure 4.If system has a plurality of large-scale wind electricities field, all can simulate one by one like this.
(3), set up the Simulation Calculation of wind energy turbine set connecting system according to real topology and synchronous alternating-current generator group, transformer capacity and the parameter of the large-scale wind electricity field access electrical network of being studied.Wherein:
● the lumped parameter of alternating current circuit or distribution parameter, all adopt actual famous value, need not unified reduction;
● the parameter of genset, adopting with the genset rated capacity is the perunit value parameter of benchmark;
● the parameter of transformer, taking with the transformer rated capacity is the perunit value parameter of benchmark;
● if contain opertaing device such as direct current in the system, its capacity and parameter all can be taken as actual value, need not to convert.
(4) research large-scale wind electricity field under different wind friction velocities power producing characteristics to the influence of system, as different mean wind speed conditions, different gradual change wind, fitful wind etc., the wind power system of separate unit blower fan that can be by detailed modeling is achieved, as adjusting basic wind v among the resultant wind velocity v
Wb, fitful wind v
Wg, gradual change wind v
Wr, random noise wind v
WmSize and ratio; In the large-scale wind electricity field, the machine of wind farm grid-connected generating is organized a performance to count and is changed, and then can pass through the accommodative realization of controlled current source current amplification factor N; The equivalent polymerization simulation system of large-scale wind electricity field electromagnetic transient simulation can be used for studying the Whole Response characteristic of large-scale wind electricity field after the fault disturbance.
With the wind energy turbine set analogue system that contains many typhoons group of motors shown in the Figure of description 1 is example, this system contains four double-fed fan motor units, separate unit unit rated capacity is 2MW, and each unit boosts by 0.69kV/35kV and becomes the feed-in wind-powered electricity generation and compile the station, and inserts major network by the 35kV/330kV transformer.The control system of wind-powered electricity generation unit is carried out pulse width modulation controlled to the voltage source converter of rotor-side and stator side respectively, and wherein the controlled target of rotor-side is for deciding rotating speed control, deciding Reactive Power Control; The stator side controlled target is for to decide DC voltage and to decide Reactive Power Control.Figure of description 4 is the equivalent polymerization simulation systems with the corresponding large-scale wind electricity field electromagnetic transient simulation of system shown in the Figure of description 1, utilize the separate unit double-fed unit of simulation in detail to inject and the site electric current, be that wind-powered electricity generation machine 0.69kV/35kV boosts and becomes secondary side outlet electric current, after ratio is amplified, to and the controlled ideal current source electric current in site control, to simulate the dynamic response of other unit.The contrast effect of two kinds of methods shows, adopt many unit simulations, system modelling process complexity, and owing to contain a large amount of high frequency switching devices in the blower fan control system, as IGBT, therefore simulate the increase of scale along with the wind-powered electricity generation unit, the simulation calculation efficient of system will significantly reduce, two kinds simulation modeling system-computed contrast consuming time as shown in Figure 5,2 unit emulation need 3 ' 25 ', 3 unit emulation consuming time to need consuming time 6 ", 4 unit emulation need consuming time 9 ' 57 ", counting yield will become the main bottleneck of remarkable large-scale wind electricity field stimulation scale; Utilize controlled current source simulation large-scale wind electricity field, the modeling complexity can greatly be simplified, the increase of wind energy turbine set unit scale, only get final product by revising equivalent controlled current source injection current size, simulation calculation efficient is with the not restriction of wind-engaging electric field simulation scale, different wind-powered electricity generation machines several basically identicals of following system emulation time of organizing a performance are 1 ' 25 " about.
In addition, under two kinds of different modeling pattern, the transient response curve behind the wind energy turbine set 330kV side single-phase earthing fault is respectively shown in Fig. 6-8.From the contrast of the curve of result of calculation as can be seen, the equivalent polymerization analogy method of large-scale wind electricity field electromagnetic transient simulation, the accurate dynamic perfromance of simulation system after disturbed, method is accurate, reliable, credible.According to PSCAD/EMTDC generator and electric network numerical solution algorithm as shown in Figures 9 and 10, the constellation effect of utilizing the controlled current source simulation to have the wind-powered electricity generation unit of identical configuration as can be known meets algorithm basic principle.
Claims (5)
1. the equivalent polymerization analogy method of a large-scale wind electricity field electromagnetic transient simulation is characterized in that: adopt separate unit wind-powered electricity generation unit to add the dynamic perfromance of desirable controlled current source simulation large-scale wind electricity field, may further comprise the steps:
(1) adopts the electromagnetic transient in power system emulation tool, at identical each the large-scale wind electricity field of unit composition form, foundation is the detailed realistic model of prime mover system, aerogenerator and the control system of benchmark with the single-machine capacity, extracts the current signal that this machine exports wind-electricity integration point to;
(2) with after N-1 times of this current signal amplification, wherein, N is a natural number, as wind-electricity integration point controlled current source current output value; This model can be used for simulating the large-scale wind electricity field with N typhoon group of motors; If system has a plurality of large-scale wind electricities field, all can carry out like this;
(3) set up the AC network model, connect each large-scale wind electricity field and AC network, wherein each component parameters of AC network all is taken as actual famous value, need not conversion;
(4) the large-scale wind electricity field variation characteristic of exerting oneself is provided with realization by separate unit blower fan relevant; The variation of wind energy turbine set start platform number then directly can realize by controlled current source current amplification factor N.
2. the method for claim 1 is characterized in that, further comprises following detailed step:
(1) the detailed modeling of separate unit grid connected wind power unit in the large-scale wind power field
Adopt the electromagnetic transient in power system emulation tool,, set up the detailed realistic model of separate unit wind-powered electricity generation unit, comprise the detailed realistic model of wind power system, aerogenerator and control system at the large-scale wind electricity field of forming by same type wind-powered electricity generation unit;
(2) a, b, c three-phase current signal i wind energy turbine set machine group assembly effect and site controlled current source analogy method extraction double-fed set grid-connection point circuit
Wa, i
Wb, i
Wc, and with this current signal amplification N-1 doubly, wherein N is and the corresponding natural coefficient of wind energy turbine set wind-powered electricity generation platform number; Insert desirable controlled current source at wind-electricity integration point, its a, b, each phase current values of c are the numerical value after electric current amplifies, and are shown below:
i
ca＝(N-1)×i
wa
i
cb＝(N-1)×i
wb
i
cc＝(N-1)×i
wc
In the formula, i
Wa, i
Wb, i
WcWith i
Ca, i
Cb, i
CcBe respectively wind-electricity integration point circuit electric current and desirable controlled current source electric current;
Utilize this model to simulate to have the large-scale wind electricity field of N platform wind-powered electricity generation unit of the same type; If system has a plurality of large-scale wind electricities field, all can simulate one by one like this;
(3) the AC network modeling strategy under the wind energy turbine set equivalence polymerization simulated conditions
According to real topology and synchronous alternating-current generator group, transformer capacity and the parameter of the large-scale wind electricity field access electrical network of being studied, set up the Simulation Calculation of wind energy turbine set connecting system, wherein:
1.. the lumped parameter of alternating current circuit or distribution parameter, all adopt actual famous value, need not unified reduction;
2.. the parameter of genset, adopting with the genset rated capacity is the perunit value parameter of benchmark;
3.. the parameter of transformer, taking with the transformer rated capacity is the perunit value parameter of benchmark;
4.. if contain opertaing device such as direct current in the system, its capacity and parameter all can be taken as actual value, need not to convert;
(4) wind energy turbine set equivalence polymerization simulated conditions leeward Electric Field Characteristics control method
Research large-scale wind electricity field power producing characteristics under different wind friction velocities comprises different mean wind speed conditions, different gradual change wind and fitful wind to the influence of system, and the wind power system of the separate unit blower fan by detailed modeling is achieved, and comprises and adjusts basic wind v among the resultant wind velocity v
Wb, fitful wind v
Wg, gradual change wind v
WrWith random noise wind v
WmSize and ratio.
3. method as claimed in claim 2 is characterized in that, in the detailed modeling of separate unit grid connected wind power unit, the critical piece modeling process of doubly-fed variable-speed constant-frequency rate unit is as follows in the described large-scale wind power field:
1.. the wind power system
The simulation of wind power system comprises three parts: wind speed simulation system, wind wheel unit simulated behavior and blade angle control section, wind power system are output as aerogenerator input mechanical torque;
Dynamically wind speed can be simulated basic wind v
Wb, fitful wind v
Wg, gradual change wind v
Wr, random noise wind v
Wm, resultant wind velocity v is
v＝v
wb+v
wg+v
wr+v
wm
Cube proportional relation of wind energy that wind energy conversion system is caught and wind speed, also relevant with the rotating speed and the structural parameters of pneumatic equipment blades made simultaneously, wind energy conversion system output machine torque is:
Wherein, C
pBe wind energy conversion efficiency coefficient, it is slurry elongation β and the blade tip speed ratio λ (function of λ=R ω/v); R is a blade radius; ω is the pneumatic equipment blades made rotating speed; A is the blade swept area; ρ is an atmospheric density; V is a wind speed; P
NBe the power base value;
2.. aerogenerator
Wind power generating set adopts the squirrel-cage induction motor simulation, and aerogenerator can be interconnected with the external voltage source by the generator slip ring with different its rotor loops that just are of common asynchronous moter maximum, therefore, and its rotor voltage u
RdWith u
RqBe not equal to 0, by control rotor external voltage, can control the meritorious and reactive power of double fed induction generators, the voltage equation that rotates doubly fed induction generator under the dq0 coordinate system synchronously is:
U in the formula
Sd, u
Sq, u
Rd, u
RqBe respectively the d axle and the q axle component of stator winding and rotor winding voltage; R
sAnd R
rBe respectively stator winding and rotor winding phase resistance; i
Sd, i
Sq, i
Rd, i
RqBe respectively the d axle and the q axle component of stator winding and rotor winding; ω
NBe synchronous rotational speed; S is the rotor slippage; ψ
Sd, ψ
Sq, ψ
Rd, ψ
RqBe respectively the magnetic linkage of stator and rotor d axle and q axle;
The magnetic linkage equation of wind power generating set is:
ψ
sd＝(L
ss+L
m)i
sd+L
mi
rd
ψ
sq＝(L
ss+L
m)i
sq+L
mi
rq
ψ
rd＝(L
rr+L
m)i
rd+L
mi
sd
ψ
rq＝(L
rr+L
m)i
rq+L
mi
sq
Wherein, L
Ss, L
Rr, L
mBe respectively stator and the every leakage inductance mutually of rotor, and the mutual inductance between stator and rotor;
3.. blower fan control system
The double-fed fan motor unit control system is that stator side and rotor-side voltage source converter are controlled, and realizes the adjusting to unit performance and output power;
The blower fan control system model can be divided into two-layer, ground floor is wind energy conversion system wind energy acquisition control and wind-powered electricity generation unit Reactive Power Control, wind energy conversion system wind energy acquisition control detection rotor rotating speed, according to optimized rotating speed-powertrace, determine stator winding active power of output reference value so that the same wind speed of the wind energy that wind energy conversion system is caught-powertrace unanimity, Reactive Power Control is determined the idle reference value of wind-powered electricity generation unit according to the Reactive Power Control strategy; The second layer is power decoupled control, controls determined active power and reactive power reference qref is a controlled target with ground floor, realizes meritorious, the idle decoupling zero control of both sides transverter;
4. method as claimed in claim 3 is characterized in that in the large-scale wind electricity field, and the machine of wind farm grid-connected generating is organized a performance to count and changed, and N is achieved by the controlled current source current amplification factor;
5. method of studying the Whole Response characteristic of large-scale wind electricity field after the fault disturbance is characterized in that using the equivalent polymerization analogy method of the arbitrary described large-scale wind electricity of claim 2-4 field electromagnetic transient simulation.
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