CN102024079B - 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 a kind of equivalent aggregation simulation method of Large Scale Wind Farm Integration electromagnetic transient simulation.
Background technology
Reduce discharging the deep enforcement of policy along with national energy-saving, new forms of energy particularly wind energy will develop on a large scale.Different from the distributed dispersion access of external wind energy turbine set electrical network, China's wind-resources is relatively concentrated, the areas such as southeastern coast, Northern Kansu, In The North of Xinjiang, the Inner Mongol and Heilungkiang, northeast, Jilin and northern Hebei are the wind-resources close quarters, so the development and utilization of China's wind-powered electricity generation will be adopted on a large scale, intensive development, the pattern that remote large capacity is sent outside.In the intensive wind-powered electricity generation base of wind-resources, usually form some Large Scale Wind Farm Integrations according to the geographic position, each Large Scale Wind Farm Integration generally is made of the identical and numerous wind-powered electricity generation unit of model.These Large Scale Wind Farm Integrations are by adjacent or public transformer station access electrical network.
Meritorious intermittent wave characteristic and the reactive power consumption accompanying characteristics of exerting oneself of Large Scale Wind Farm Integration, 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 the Large Scale Wind Farm Integration 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 exploitation of wind-powered electricity generation, concentrate the relevant research of access to become gradually focus to Large Scale Wind Farm Integration.
Electromagnetic transient in power system emulation is that the research Large Scale Wind Farm Integration is to the powerful of wind energy turbine set operation characteristic, wind energy turbine set operation control strategy under system power quality influence, asymmetric operation state, but be subject to simulation calculation scale and speed, Large Scale Wind Farm Integration connecting system modeling process need to carry out loaded down with trivial details data to be processed.The method that adopts at present mainly contains two kinds, the first with wind energy turbine set adopt unit or multimachine equivalent, need start situation actual in wind energy turbine set to carry out parameter reduction under specified conditions to wind-powered electricity generation unit, blower fan control system for this reason; It two is the whole wind energy turbine set of unit simulation that adopt rated capacity, and according to the one pole rated capacity, the AC network parameter is carried out corresponding reduction.Above two kinds of methods all unavoidably will be carried out loaded down with trivial details parameter reduction, and calculated amount is large, 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 object of the invention is to, a kind of equivalent aggregation simulation method of Large Scale Wind Farm Integration 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 the equal identical Large Scale Wind Farm Integration of wind-powered electricity generation unit model and control system, propose to add with separate unit wind-powered electricity generation unit the aggregation simulation method of the dynamic perfromance of controlled ideal current source simulation Large Scale Wind Farm Integration.
The equivalent aggregation simulation method of a kind of Large Scale Wind Farm Integration electromagnetic transient simulation of the present invention adopts separate unit wind-powered electricity generation unit to add the dynamic perfromance of desirable controlled current source simulation Large Scale Wind Farm Integration, comprises the following steps:
(1) adopt the electromagnetic transient in power system emulation tool, for identical each Large Scale Wind Farm Integration of unit composition form, the detailed realistic model of prime mover system, aerogenerator and the control system of foundation take single-machine capacity as benchmark 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 natural number, as wind-electricity integration point controlled current source current output value; This model can be used for simulating the Large Scale Wind Farm Integration with N typhoon group of motors; If system has a plurality of Large Scale Wind Farm Integrations, all can carry out like this;
(3) set up the AC network model, connect each Large Scale Wind Farm Integration 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 Farm Integration variation characteristic of exerting oneself arranges realization by separate unit blower fan relevant; The variation of wind energy turbine set start number of units 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, for the Large Scale Wind Farm Integration that is formed 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;
(2) wind energy turbine set machine group assembly effect and a, b, c three-phase current signal i site controlled current source analogy method extraction double-fed set grid-connection point circuit
wa, i
wb, i
wc, and this current signal is amplified N-1 doubly, wherein N is the natural coefficient corresponding with wind energy turbine set wind-powered electricity generation number of units; At the desirable controlled current source of wind-electricity integration point access, 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 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 can simulate the Large Scale Wind Farm Integration with N platform wind-powered electricity generation unit of the same type; If system has a plurality of Large Scale Wind Farm Integrations, all can simulate one by one like this;
(3) the AC network modeling strategy under wind energy turbine set equivalent aggregation simulated conditions
According to real topology and synchronous alternating-current generator group, transformer capacity and the parameter of the Large Scale Wind Farm Integration access electrical network of studying, 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, adopt the perunit value parameter take the genset rated capacity as benchmark;
7.. the parameter of transformer, take the perunit value parameter take the transformer rated capacity as benchmark;
8.. if contain the opertaing devices such as direct current in system, its capacity and parameter all can be taken as actual value, need not conversion;
(4) wind energy turbine set equivalent aggregation simulated conditions leeward Electric Field Characteristics control method
Research Large Scale Wind Farm Integration power producing characteristics impact on system under different wind friction velocities comprises different mean wind speed conditions, different gradual change wind and fitful wind, and the wind power system of the separate unit blower fan by detailed modeling is achieved, and comprises and adjusts basic wind v in resultant wind velocity v
wb, fitful wind v
wg, gradual change wind v
wrWith random noise wind v
wmSize and ratio.
Wherein, in described large-scale wind power field, 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:
1.. the wind power system
Wind power system simulation comprises three parts: wind speed simulation system, wind wheel unit simulated behavior and blade angle control section, and the wind power system is output as aerogenerator input mechanical torque;
Dynamic 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 the wind energy that wind energy conversion system is caught and wind speed, also relevant with 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 blade radius; ω is the pneumatic equipment blades made rotating speed; A is the blade swept area; ρ is atmospheric density; V is wind speed; P
NBe the power base value;
2.. aerogenerator
Wind power generating set adopts the squirrel-cage induction motor simulation, and aerogenerator and common asynchronous moter maximum different just are that its rotor loop can be interconnected with the external voltage source by Generator Slip Ring, therefore, and its rotor voltage u
rdWith u
rqBe not equal to 0, by controlling the rotor external voltage, can control the meritorious and reactive power of double fed induction generators, under synchronous rotary dq0 coordinate system, the voltage equation of doubly fed induction generator is:
U in formula
sd, u
sq, u
rd, u
rqBe respectively 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 d axle and the q axle component of stator winding and rotor winding; ω
NBe synchronous rotary 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 that the wind energy conversion system wind energy is caught control and wind-powered electricity generation unit Reactive Power Control, the wind energy conversion system wind energy is caught and is controlled the 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-powertrace of the wind energy that wind energy conversion system is caught is consistent, 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 that power decoupled is controlled, and controls determined active power and reactive power reference qref as controlling target take ground floor, realizes that meritorious, the idle decoupling zero of both sides transverter controlled;
Wherein, in Large Scale Wind Farm Integration, the unit number of units of wind farm grid-connected generating changes, 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 Farm Integration after the fault disturbance, it uses the equivalent aggregation simulation method of above-mentioned Large Scale Wind Farm Integration electromagnetic transient simulation.
Electromagnetic transient in power system emulation tool of the present invention, as widely used PSCAD/EMTDC electromagnetic transient analysis commercial packages by the research centre exploitation of Canadian Manitoba university's D.C. high voltage transmission in electric system, for
By the Large Scale Wind Farm Integration that same type wind-powered electricity generation unit forms, 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 the method can significantly simplify the complexity of Large Scale Wind Farm Integration 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 Farm Integration 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 schematic diagram that contains many typhoons group of motors of the present invention;
Fig. 2: according to wind power simulation system schematic diagram of the present invention;
Fig. 3: according to doubly fed machine steering logic schematic diagram of the present invention;
Fig. 4: according to the wind farm grid-connected equivalent Injection Current source analogue simulation system schematic diagram that contains many typhoons group of motors of the present invention;
Fig. 5: according to the contrast schematic 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 schematic 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 schematic 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 schematic diagram of two kinds of different analogue systems of the present invention;
Fig. 9: according to electric network resolution principle schematic diagram in electromagnetic transient simulation software PSCAD/EMTDC of the present invention;
Figure 10: according to generator and the mutual resolution principle schematic diagram of electric network in electromagnetic transient simulation software PSCAD/EMTDC of the present invention.
Embodiment
(1) adopt the electromagnetic transient in power system emulation tool, as widely used PSCAD/EMTDC electromagnetic transient analysis commercial packages by the research centre exploitation of Canadian Manitoba university's D.C. high voltage transmission in electric system, for the Large Scale Wind Farm Integration that is formed 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, rotor-side VSC control the active power of wind-powered electricity generation unit output and reactive power, stator side VSC control Converter DC-side voltage and with the reactive power of AC network exchange
(2) for 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 the natural coefficient corresponding with wind energy turbine set wind-powered electricity generation number of units; At the desirable controlled current source of wind-electricity integration point access, 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 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 simulation system of windy group of motors according to the method, as shown in Figure 4.If system has a plurality of Large Scale Wind Farm Integrations, all can simulate one by one like this.
(3) according to real topology and synchronous alternating-current generator group, transformer capacity and the parameter of the Large Scale Wind Farm Integration access electrical network of studying, set up the Simulation Calculation of wind energy turbine set connecting system.Wherein:
● the lumped parameter of alternating current circuit or distribution parameter, all adopt actual famous value, need not unified reduction;
● the parameter of genset, adopt the perunit value parameter take the genset rated capacity as benchmark;
● the parameter of transformer, take the perunit value parameter take the transformer rated capacity as benchmark;
● if contain the opertaing devices such as direct current in system, its capacity and parameter all can be taken as actual value, need not conversion.
(4) research Large Scale Wind Farm Integration power producing characteristics impact on system under different wind friction velocities, 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 in resultant wind velocity v
wb, fitful wind v
wg, gradual change wind v
wr, random noise wind v
wmSize and ratio; In Large Scale Wind Farm Integration, the unit number of units of wind farm grid-connected generating changes, and can pass through the accommodative realization of controlled current source current amplification factor N; The equivalent aggregation simulation system of Large Scale Wind Farm Integration electromagnetic transient simulation can be used for studying the Whole Response characteristic of Large Scale Wind Farm Integration after the fault disturbance.
Take the wind energy turbine set analogue system that contains many typhoons group of motors shown in Figure of description 1 as example, this system contains four double-fed fan motor units, the single unit rated capacity is 2MW, and each unit boosts by 0.69kV/35kV and becomes the feed-in wind-powered electricity generation and collect the station, and by 35kV/330kV transformer access major network.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 Reactive Power Control is controlled, decided to the control target of rotor-side for deciding rotating speed; Stator side is controlled target for to decide DC voltage and to decide Reactive Power Control.Figure of description 4 is equivalent aggregation simulation systems of the Large Scale Wind Farm Integration electromagnetic transient simulation corresponding with system shown in 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 turbine 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, the system modelling process is complicated, and owing to containing a large amount of high frequency switching devices in 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, the simulation modeling system-computed contrast consuming time of two kinds 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 link of remarkable large-scale wind electricity field stimulation scale; Utilize controlled current source simulation Large Scale Wind Farm Integration, 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 turbines several lower system emulation times of organizing a performance are basically identical, are 1 ' 25 " left and right.
In addition, under two kinds of different modeling pattern, the transient response curve after the wind energy turbine set 330kV side single-phase earthing fault is respectively as shown in Fig. 6-8.Can find out from the curve comparison of result of calculation, the equivalent aggregation simulation method of Large Scale Wind Farm Integration 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 as can be known the controlled current source simulation to have the wind-powered electricity generation unit of identical configuration meets the ultimate principle of algorithm.
Claims (4)
1. the equivalent aggregation simulation method of a Large Scale Wind Farm Integration 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 Farm Integration, comprise the following steps:
(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, for the Large Scale Wind Farm Integration that is formed by same type wind-powered electricity generation unit, the detailed realistic model of prime mover system, aerogenerator and the control system of foundation take single-machine capacity as benchmark extracts the current signal that the wind-powered electricity generation unit exports wind-electricity integration point to;
(2) the also site controlled current source analogy method of wind energy turbine set machine group assembly effect, a, b, the c three-phase current signal i of extraction double-fed set grid-connection point circuit
wa, i
wb, i
wc, and this current signal is amplified N-1 doubly, wherein N is the natural coefficient corresponding with wind energy turbine set wind-powered electricity generation number of units; At the desirable controlled current source of wind-electricity integration point access, 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 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;
This model can be used for simulating the Large Scale Wind Farm Integration with N platform wind-powered electricity generation unit of the same type; If system has a plurality of Large Scale Wind Farm Integrations, all can carry out one by one like this;
(3) the AC network modeling strategy under wind energy turbine set equivalent aggregation simulated conditions, real topology and synchronous alternating-current generator group, transformer capacity and parameter according to the Large Scale Wind Farm Integration access electrical network of studying, set up the AC network model, connect each Large Scale Wind Farm Integration and AC network, each component parameters of AC network all is taken as actual famous value, need not conversion, 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, adopt the perunit value parameter take the genset rated capacity as benchmark;
3.. the parameter of transformer, take the perunit value parameter take the transformer rated capacity as benchmark;
4.. if contain DC control equipment in system, its capacity and parameter all can be taken as actual value, need not conversion;
(4) wind energy turbine set equivalent aggregation simulated conditions leeward Electric Field Characteristics control method, the Large Scale Wind Farm Integration variation characteristic of exerting oneself arranges realization by separate unit blower fan relevant:
Research Large Scale Wind Farm Integration power producing characteristics impact on system under different wind friction velocities comprises different mean wind speed conditions, different gradual change wind and fitful wind, and the wind power system of the separate unit blower fan by detailed modeling is achieved, and comprises and adjusts basic wind v in resultant wind velocity v
wb, fitful wind v
wg, gradual change wind v
wrWith random noise wind v
wmSize and ratio;
The variation of wind energy turbine set start number of units directly can realize by controlled current source current amplification factor N.
2. the method for claim 1, is characterized in that, in described large-scale wind power field, 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:
1.. the wind power system
Wind power system simulation comprises three parts: wind speed simulation system, wind wheel unit simulated behavior and blade angle control section, and the wind power system is output as aerogenerator input mechanical torque;
Dynamic 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 the wind energy that wind energy conversion system is caught and wind speed, also relevant with rotating speed and the structural parameters of pneumatic equipment blades made simultaneously, wind energy conversion system output machine torque is:
Wherein, Cp is wind energy conversion efficiency coefficient, and it is the function of slurry elongation β and blade tip speed ratio λ, and the λ computing formula is λ=R ω/v; R is blade radius; ω is the pneumatic equipment blades made rotating speed; A is the blade swept area; ρ is atmospheric density; V is wind speed; PN is the power base value;
2.. aerogenerator
Wind power generating set adopts the squirrel-cage induction motor simulation, and aerogenerator and common asynchronous moter maximum different just are that its rotor loop can be interconnected with the external voltage source by Generator Slip Ring, therefore, and its rotor voltage u
rdWith u
rqBe not equal to 0, by controlling the rotor external voltage, can control the meritorious and reactive power of double fed induction generators, under synchronous rotary dq0 coordinate system, the voltage equation of doubly fed induction generator is:
U in formula
sd, u
sq, u
rd, u
rqBe respectively 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 d axle and the q axle component of stator winding and rotor winding; ω
NBe synchronous rotary 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 is divided into two-layer, ground floor is that the wind energy conversion system wind energy is caught control and wind-powered electricity generation unit Reactive Power Control, the wind energy conversion system wind energy is caught and is controlled the 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-powertrace of the wind energy that wind energy conversion system is caught is consistent, 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 that power decoupled is controlled, and controls determined active power and reactive power reference qref as controlling target take ground floor, realizes that meritorious, the idle decoupling zero of both sides transverter controlled.
3. method as claimed in claim 2, is characterized in that in Large Scale Wind Farm Integration, and the unit number of units of wind farm grid-connected generating changes, and N is achieved by the controlled current source current amplification factor.
4. a method of studying the Whole Response characteristic of Large Scale Wind Farm Integration after the fault disturbance, is characterized in that right to use requires the equivalent aggregation simulation method of 2 or 3 arbitrary described Large Scale Wind Farm Integration electromagnetic transient simulations.
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|---|---|---|---|
| CN2010105677176A CN102024079B (en) | 2010-12-01 | 2010-12-01 | Equivalent aggregation simulation method for electromagnetic transient simulation of large-scale wind farm |
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| CN112910006B (en) * | 2021-03-19 | 2022-12-09 | 哈尔滨工业大学 | Universal electromagnetic transient modeling method for direct-drive wind turbine generator |
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