CN110299729A - A kind of stability assessment method and system of double-fed fan motor unit - Google Patents
A kind of stability assessment method and system of double-fed fan motor unit Download PDFInfo
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Abstract
The present invention relates to a kind of stability assessment method and system of double-fed fan motor unit, belong to wind generator system technical field, solves the problems, such as that double-fed fan motor unit stability is poor in the prior art, safety coefficient is not high and can not be the problem of carrying out online evaluation on full-time domain.Port voltage, electric current, active power and the time domain variable quantity at locking phase angle for measuring double-fed fan motor unit first, are calculated the port energy of double-fed fan motor unit, and then the Dissipation Strength of Wind turbines is calculated.The stability that system can more rapidly, be effectively judged by the size of Dissipation Strength, realizes the real-time monitoring of dynamic power, improves system working efficiency.
Description
Technical field
The present invention relates to wind generator system technical field more particularly to a kind of stability assessment sides of double-fed fan motor unit
Method and system.
Background technique
Improved day by day with wind generating technology, large-scale wind power passes through interacted system conveying consumption.But at the same time
Sub-synchronous oscillation problem also gradually highlights, and especially when double-fed fan motor unit is concatenated compensation system and sends outside, sub-synchronous oscillation is existing
As occurring repeatedly and more frequently, wind power plant off-grid Frequent Accidents seriously threaten power network safety operation.
In view of the above problems, how quickly and effectively to judge to vibrate development trend, online evaluation system maintenance level is wind-powered electricity generation
Field control and dispatching of power netwoks provide reliable stability criteria in real time, it has also become urgent problem to be solved.
Currently, Wind turbines/supersynchronous vibrational stabilization assessment has been increasingly becoming lot of domestic and foreign expert and scholar's research
Hot spot.However, existing maintenance level appraisal procedure is only capable of providing offline stability criterion, can not be carried out on full-time domain online
Stability Assessment, and most researchs are from the full rank model of wind-electricity integration system, it is difficult to it is suitable for large-scale electrical power system.
Summary of the invention
In view of above-mentioned analysis, the embodiment of the present invention be intended to provide a kind of double-fed fan motor unit stability assessment method and
System, to solve, existing double-fed fan motor unit stability is poor, safety coefficient is not high and it is online to carry out on full-time domain
The problem of assessment.
The purpose of the present invention is mainly achieved through the following technical solutions:
A kind of stability assessment method of double-fed fan motor unit, which comprises the following steps:
Step 1, measurementThe port voltage, electric current of double-fed fan motor unit in a period, active power and locking phase angle when
Domain variable quantity；
Step 2, based on each time domain variable quantity measured in step 1, what it is using foundation includes that phaselocked loop and string mend line
The double-fed fan motor unit port energy model of road system parameter, is calculated the port energy of double-fed fan motor unit；
The port energy for the double-fed fan motor unit that step 3, basis are calculated, obtains the dissipation of double-fed fan motor unit
Intensity, according to the maintenance level of the size assessment system of Dissipation Strength.
On the basis of above scheme, the present invention has also done following improvement:
Further, the port energy of double-fed fan motor unit described in step 2 is equal to serial supplementary line dynamic power and locking phase
The sum of ring dynamic power:
In formula: Δ W1For serial supplementary line dynamic power, Δ W2For phaselocked loop dynamic power, Δ PeIt is defeated for double-fed fan motor unit
The time domain variable quantity of active power out；Δ θ is the locking phase angle time domain variable quantity of double-fed fan motor unit phaselocked loop；Δud、Δuq、Δ
idWith Δ iqRespectively d, q axis time domain change component of the voltage and current Relative steady-state of double-fed fan motor unit output port；ω is
D, the frequency of oscillation under q axis.
Further, the step 3 includes:
Port energy is carried out discretization by step 301:
Obtain double-fed fan motor unit t1,……tnWhen port energy value Δ WDFIG(t1) ... ..., Δ WDFIG(tn)；N is number
According to number；
Step 302, the port energy Δ W using discretizationDFIG(t1) ... ..., Δ WDFIG(tn), solve Dissipation Strength η.
Further, the step 302 includes:
The average value of the double-fed fan motor unit port energy of discretization is calculated using following formula:
Utilize the port energy Δ W of obtained discretizationDFIG(t1) ... ..., Δ WDFIG(tn) and the average value, it is based on
Dissipation Strength is calculated in following formula:
Wherein, ▽ [] is gradient signs.
Further, assess maintenance level according to η size: as η > 0, system is stablized, and value is bigger, and maintenance level is higher；
As η=0, system is neutrality；As η < 0, system is unstable, sub-synchronous oscillation diverging.
On the other hand, the embodiment of the invention provides a kind of stability assessment systems of double-fed fan motor unit, including data
Acquisition module, port energy computation module, Stability Assessment module and result output module；
The data acquisition module is for acquiring double-fed fan motor unit port voltage, electric current, active power and locking phase angle
Time domain variable quantity；
The port energy computation module is used to calculate the port energy of double-fed fan motor unit；
The Stability Assessment module is secondary, hypersynchronous steady according to the positive and negative and size of Dissipation Strength assessment double-fed fan motor unit
Fixed level；
The result output module is for exporting the real-time port energy of double-fed fan motor unit and maintenance level.
Further, the data acquisition module passes through the PMU device that is installed on double-fed fan motor unit port and phaselocked loop
Collection voltages, electric current, active power and the time domain variable quantity at locking phase angle.
Further, the port energy computation module receives the data of data acquisition module input, is calculated based on following formula
To the port energy of double-fed fan motor unit:
In formula: Δ W1For serial supplementary line dynamic power, Δ W2For phaselocked loop dynamic power, Δ PeIt is defeated for double-fed fan motor unit
The time domain variable quantity of active power out；Δ θ is the locking phase angle time domain variable quantity of double-fed fan motor unit phaselocked loop；Δud、Δuq、Δ
idWith Δ iqRespectively d, q axis time domain change component of the voltage and current Relative steady-state of double-fed fan motor unit output port；ω is
D, the frequency of oscillation under q axis.
Further, the Stability Assessment module is according to the maintenance level of the size assessment system of η, comprising:
Step S1, port energy is subjected to discretization:
Obtain double-fed fan motor unit t1,……tnWhen port energy value Δ WDFIG(t1) ... ..., Δ WDFIG(tn)；N is number
According to number；
Step S2, the port energy Δ W of discretization is utilizedDFIG(t1) ... ..., Δ WDFIG(tn), solve Dissipation Strength η；
Step S3, assess maintenance level according to η size: as η > 0, system is stablized, and value is bigger, and maintenance level is higher；
As η=0, system is neutrality；As η < 0, system is unstable, sub-synchronous oscillation diverging.
Further, the step S2 is specifically included:
Step S201, the average value of the double-fed fan motor unit port energy of discretization is calculated using following formula:
Step S202, the port energy Δ W of obtained discretization is utilizedDFIG(t1) ... ..., Δ WDFIG(tn) and port energy
Dissipation Strength is calculated based on following formula in the average value of amount:
Wherein, ▽ [] is gradient signs.
Compared with prior art, the present invention can at least realize one of following beneficial effect:
1, the stability that system can more rapidly, be effectively judged by the size of Dissipation Strength, realizes dynamic power
Real-time monitoring improves system working efficiency；
2, calculation amount is reduced by port energy computation module, reduces calculating error, ensure that the accurate fortune of system
Row；
3, the stability margin that quantization is provided by Stability Assessment module realizes oscillation early warning, ensure that the stabilization of power grid
Safe operation；
4, by emulation experiment, the stabilization online evaluation on full-time domain is realized, improves the safety of system and reliable
Property.
It in the present invention, can also be combined with each other between above-mentioned each technical solution, to realize more preferred assembled schemes.This
Other feature and advantage of invention will illustrate in the following description, also, certain advantages can become from specification it is aobvious and
It is clear to, or understand through the implementation of the invention.The objectives and other advantages of the invention can pass through institute in specification and attached drawing
It is achieved and obtained in the content particularly pointed out.
Detailed description of the invention
Attached drawing is only used for showing the purpose of specific embodiment, and is not to be construed as limiting the invention, in entire attached drawing
In, identical reference symbol indicates identical component.
Fig. 1 is the structural schematic diagram of double-fed fan motor unit grid-connected system in one embodiment；
Fig. 2 is a kind of stability assessment system structure diagram of double-fed fan motor unit in another embodiment；
Fig. 3 is a kind of stability assessment system emulation structure chart of double-fed fan motor unit in another embodiment；
The port power figure of double-fed fan motor unit when Fig. 4 is oscillation and divergence in another embodiment；
Double-fed fan motor unit port energy diagram when Fig. 5 is oscillation and divergence in another embodiment；
The port power figure of double-fed fan motor unit when Fig. 6 is self-sustained oscillation in another embodiment；
Double-fed fan motor unit port energy diagram when Fig. 7 is self-sustained oscillation in another embodiment；
Fig. 8 is the port power figure of double-fed fan motor unit when vibrating convergence in another embodiment；
Fig. 9 is double-fed fan motor unit port energy diagram when vibrating convergence in another embodiment；
Specific embodiment
Specifically describing the preferred embodiment of the present invention with reference to the accompanying drawing, wherein attached drawing constitutes the application a part, and
Together with embodiments of the present invention for illustrating the principle of the present invention, it is not intended to limit the scope of the present invention.
A specific embodiment of the invention, discloses a kind of stability assessment method of double-fed fan motor unit, including with
Lower step:
Step 1, measurementThe port voltage, electric current of double-fed fan motor unit in a period, active power and locking phase angle when
Domain variable quantity；
Step 2, based on each time domain variable quantity measured in step 1, what it is using foundation includes that phaselocked loop and string mend line
The double-fed fan motor unit port energy model of road system parameter, is calculated the port energy of double-fed fan motor unit；
The port energy for the double-fed fan motor unit that step 3, basis are calculated, obtains the dissipation of double-fed fan motor unit
Intensity, according to the maintenance level of the size assessment system of Dissipation Strength.
The stability that system can more rapidly, be effectively judged by the size of Dissipation Strength, realizes the reality of dynamic power
When monitor, improve system working efficiency.
Preferably, as shown in Figure 1, establishing the double-fed fan motor unit port energy for considering phaselocked loop and serial supplementary line system parameter
Measure model.The port energy of double-fed fan motor unit is equal to the sum of serial supplementary line dynamic power and phaselocked loop dynamic power:
In formula: Δ W1For serial supplementary line dynamic power, Δ W2For phaselocked loop dynamic power, Δ PeIt is defeated for double-fed fan motor unit
The time domain variable quantity of active power out；Δ θ is the locking phase angle time domain variable quantity of double-fed fan motor unit phaselocked loop；Δud、Δuq、Δ
idWith Δ iqRespectively d, q axis time domain change component of the voltage and current Relative steady-state of double-fed fan motor unit output port；ω is
D, the frequency of oscillation under q axis.
Calculation amount is reduced by port energy computation module, reduces calculating error, ensure that the accurate operation of system.
Preferably, the maintenance level of the size assessment system in step 3 according to Dissipation Strength specifically includes: step 301 is incited somebody to action
Port energy carries out discretization:
Obtain double-fed fan motor unit t1,……tnWhen port energy value Δ WDFIG(t1) ... ..., Δ WDFIG(tn)；N is number
According to number；
Step 302, the port energy Δ W using discretizationDFIG(t1) ... ..., Δ WDFIG(tn), Dissipation Strength η is solved,
It specifically includes:
The average value of the double-fed fan motor unit port energy of discretization is calculated using following formula:
Utilize the port energy Δ W of obtained discretizationDFIG(t1) ... ..., Δ WDFIG(tn) and the average value, it is based on
Dissipation Strength is calculated in following formula:
Wherein, ▽ [] is gradient signs；
Step S303, assess maintenance level according to η size: as η > 0, system is stablized, and value is bigger, and maintenance level is got over
It is high；As η=0, system is neutrality；As η < 0, system is unstable, sub-synchronous oscillation diverging.
The stability margin that quantization is provided by Stability Assessment module realizes oscillation early warning, and ensure that power grid stablizes peace
Row for the national games.
Another specific embodiment of the invention, as shown in Fig. 2, providing a kind of stability assessment of double-fed fan motor unit
System, including data acquisition module, port energy computation module, Stability Assessment module and result output module；Data acquisition module
Block is for acquiring double-fed fan motor unit port voltage, electric current, active power and the time domain variable quantity at locking phase angle；Port energy balane
Module is used to calculate the port energy of double-fed fan motor unit；Stability Assessment module is assessed double according to the positive and negative and size of Dissipation Strength
Present Wind turbines, hypersynchronous maintenance level；As a result output module for export the real-time port energy of double-fed fan motor unit and
Maintenance level.
The system passes through the port voltage of measurement double-fed fan motor unit, electric current, active power and the variation of the time domain at locking phase angle
Amount, from the online quantitative evaluation double-fed fan motor grid-connected system sub-synchronous oscillation maintenance level of full-time domain frequency range, realizes dynamic power
Real-time monitoring, ensure that power grid stablizes safe operation.
Preferably, data acquisition module is acquired by the PMU device being installed on double-fed fan motor unit port and phaselocked loop
Voltage, electric current, active power and the time domain variable quantity at locking phase angle.The comprehensive of acquisition data is realized by data acquisition module
And accuracy.
Preferably, port energy computation module receives the data of data acquisition module input, is calculated based on following formula double
Present the port energy of Wind turbines:
In formula: Δ W1For serial supplementary line dynamic power, Δ W2For phaselocked loop dynamic power, Δ PeIt is defeated for double-fed fan motor unit
The time domain variable quantity of active power out；Δ θ is the locking phase angle time domain variable quantity of double-fed fan motor unit phaselocked loop；Δud、Δuq、Δ
idWith Δ iqRespectively d, q axis time domain change component of the voltage and current Relative steady-state of double-fed fan motor unit output port；ω is
D, the frequency of oscillation under q axis.
Being realized by port energy computation module reduces calculation amount by port energy computation module, reduces calculating
Error ensure that the accurate operation of system.
Preferably, Stability Assessment module is according to the maintenance level of the size assessment system of η, comprising:
Step S1, port energy is subjected to discretization:
Obtain double-fed fan motor unit t1,……tnWhen port energy value Δ WDFIG(t1) ... ..., Δ WDFIG(tn)；N is number
According to number；
Step S2, the port energy Δ W of discretization is utilizedDFIG(t1) ... ..., Δ WDFIG(tn), solve Dissipation Strength η, tool
Body includes:
Step S201, the average value of the double-fed fan motor unit port energy of discretization is calculated using following formula:
Step S202, the port energy Δ W of obtained discretization is utilizedDFIG(t1) ... ..., Δ WDFIG(tn) and port energy
Dissipation Strength is calculated based on following formula in the average value of amount:
Wherein, ▽ [] is gradient signs；
Step S3, assess maintenance level according to η size: as η > 0, system is stablized, and value is bigger, and maintenance level is higher；
As η=0, system is neutrality；As η < 0, system is unstable, subsynchronous diverging.
The stability margin that quantization is provided by Stability Assessment module realizes oscillation early warning and online evaluation, ensure that and is
System stablizes safe operation.
In order to verify the feasibility of above-described embodiment method, double-fed fan motor unit grid-connected system has been built from emulation level,
And realize that 1, system is unstable, sub-synchronous oscillation divergent state by adjusting series compensation degrees, and 2, neutrality, synchronized oscillation shape
State, 3, system stabilization, oscillation convergence, three kinds of states.And system three is obtained from the angle of another measurement based on the analogue system
Dissipation Strength under kind state utilizes this hair by learning compared with the Dissipation Strength being calculated through the embodiment of the present invention
Its precision of the Dissipation Strength of bright calculating is met the requirements, and is capable of the stability of reliable assessment system according to its positive and negative and size.
Specifically, system emulation structure chart is as shown in figure 3, in RT-LAB platform building simulation model.24 double-fed fan motors
Then field is sent out with radial access 220kV substation by 2 500kV common-tower double-return serial supplementary lines, wind-powered electricity generation installation total capacity
For 3426.55MW.Double-fed fan motor unit parameter is as shown in table 1.
1 double-fed blower fan system parameter of table
Wherein pusher side converter power outer loop control parameter is KP1=0.05, KI1=20；Current inner loop control parameter is KP2
=0.6, KI2=8.The emulation of system is carried out by pll parameter.
, sub-synchronous oscillation divergent state unstable for the system of the first:
As t=2s, the Series compensation lines of 30% series compensation degrees are accessed in double-fed fan motor grid-connected system, are occurred in system
Sub-synchronous oscillation phenomenon and oscillation is in divergent trend, the active power time-domain curve of Wind turbines port is as shown in Figure 4.
By the time domain variable quantity of the voltage of measurement Wind turbines port, electric current and power, Wind turbines end can be obtained
The measured value of mouth energy is as shown in the Blue circles in Fig. 5 (a).Measured value and calculated value are compared, it is known that calculated value and survey
Magnitude is presented ascendant trend and essentially coincides.In view of in measured value oscillating component there is also remove ω other frequency components,
Therefore there is oscillation up and down by a small margin, but fluctuating error is within 1.3%.Wind turbines port energy, phaselocked loop dynamic power
And serial supplementary line dynamic power, shown in three parts energy variation situation such as Fig. 5 (b).Phaselocked loop dynamic power is positive value, that is, is sent out
Exit port energy, serial supplementary line dynamic power perseverance are negative value, constantly absorb port energy.Wind turbines port energy perseverance is positive
Value, and constantly increase, according to Dissipation Strength stability criterion it is found that the slope of port energy at this timePerseverance is positive value, should
System is unstable, oscillation and divergence, consistent with time-domain simulation results shown in Fig. 4.
For second of synchronized oscillation, critical stable state:
As t=2s, the route that series compensation degrees are 20% is accessed into power grid, constant amplitude sub-synchronous oscillation, wind turbine occurs in system
The active power time-domain curve of group port is as shown in Figure 6.
Wind turbines port energy measure and calculated value such as Fig. 7 (a) are shown, the end that Wind turbines issue in oscillatory process
Mouth energy is held essentially constant, and the measured value of port energy and calculated value, close to unanimously, worst error is within 2.1%.Wind
Motor group port energy, phaselocked loop dynamic power and serial supplementary line dynamic power, three parts energy variation situation such as Fig. 7 (b) institute
Show.Since the changing value perseverance in one cycle of oscillation of voltage and current component at this time is constant, port energy component is also perseverance
Definite value.Wind turbines port energy perseverance is positive value,Perseverance is 0, and system is in critical stable state.
, oscillation convergence state stable for the third system: as t=2s, string is accessed in double-fed fan motor grid-connected system
The route that benefit degree is 10%, system occur sub-synchronous oscillation but then gradually converge to stabilization, the wattful power of Wind turbines port
Rate time-domain curve is as shown in Figure 8.
The calculated value of Wind turbines port energy and measured value such as Fig. 9 (a) are shown under the scene.System port energy is in
The variation tendency now dropped, and with oscillation restrain, port energy is gradually reduced, when reaching stable, port energy close to
0.By measured value and calculated value comparison it is found that the two is consistent, error is within 2.0%.Wind turbines port energy and
Shown in the variation tendency of its component such as Fig. 9 (b), in this case, phaselocked loop dynamic power and serial supplementary line dynamic power absolute value
The trend being gradually reduced is presented, the port energy for showing that Wind turbines issue gradually decreases,Perseverance is negative value, is
System is stablized.
For three of the above operating condition, Dissipation Strength is solved and using measured value online fitting by calculating port energy respectively
Dissipation Strength two ways assesses double-fed fan motor grid-connected system maintenance level.Acquired results are as shown in table 2.
2 wind power plant Dissipation Strength of table
It can be obtained by table 2, the worst error between measured value and calculated value is only 3.4%.Meanwhile wind-powered electricity generation under the first scene
Unit Dissipation Strength is negative value, and Wind turbines continue to issue port energy to power grid and gradually increase at this time, and system is unstable, vibration
Swing diverging.System Dissipation Strength persistently injects constant port energy to power grid close to zero, i.e. Wind turbines under second of scene
It measures, at this time system neutrality.Under the third scene, Dissipation Strength becomes positive value, the port energy that Wind turbines issue at this time
It is gradually reduced, wind-electricity integration system gradually tends towards stability.
By emulation experiment, the stabilization online evaluation of the invention realized on full-time domain is demonstrated, the peace of system is improved
Full property and reliability.
It will be understood by those skilled in the art that realizing all or part of the process of above-described embodiment method, meter can be passed through
Calculation machine program is completed to instruct relevant hardware, and the program can be stored in computer readable storage medium.Wherein, institute
Stating computer readable storage medium is disk, CD, read-only memory or random access memory etc..
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by anyone skilled in the art,
It should be covered by the protection scope of the present invention.
Claims (10)
1. a kind of stability assessment method of double-fed fan motor unit, which comprises the following steps:
Step 1, measurementThe time domain of the port voltage, electric current of double-fed fan motor unit, active power and locking phase angle becomes in a period
Change amount；
Step 2, based on each time domain variable quantity measured in step 1, what it is using foundation includes phaselocked loop and serial supplementary line system
The double-fed fan motor unit port energy model for parameter of uniting, is calculated the port energy of double-fed fan motor unit；
The port energy for the double-fed fan motor unit that step 3, basis are calculated, the dissipation for obtaining double-fed fan motor unit are strong
Degree, according to the maintenance level of the size assessment system of Dissipation Strength.
2. the stability assessment method of double-fed fan motor unit according to claim 1, which is characterized in that described in step 2
Double-fed fan motor unit port energy be equal to the sum of serial supplementary line dynamic power and phaselocked loop dynamic power:
In formula: Δ W1For serial supplementary line dynamic power, Δ W2For phaselocked loop dynamic power, Δ PeHave for double-fed fan motor unit output
The time domain variable quantity of function power；Δ θ is the locking phase angle time domain variable quantity of double-fed fan motor unit phaselocked loop；Δud、Δuq、ΔidWith
ΔiqRespectively d, q axis time domain change component of the voltage and current Relative steady-state of double-fed fan motor unit output port；ω is d, q
Frequency of oscillation under axis.
3. the stability assessment method of double-fed fan motor unit according to claim 1, which is characterized in that step 3 packet
It includes:
Port energy is carried out discretization by step 301:
Obtain double-fed fan motor unit t1,……tnWhen port energy value Δ WDFIG(t1) ... ..., Δ WDFIG(tn)；N is data
Number；
Step 302, the port energy Δ W using discretizationDFIG(t1) ... ..., Δ WDFIG(tn), solve Dissipation Strength η.
4. the stability assessment method of double-fed fan motor unit according to claim 3, which is characterized in that the step 302
Include:
The average value of the double-fed fan motor unit port energy of discretization is calculated using following formula:
Utilize the port energy Δ W of obtained discretizationDFIG(t1) ... ..., Δ WDFIG(tn) and the average value, based on following formula
Calculation obtains Dissipation Strength:
Wherein,For gradient signs.
5. the stability assessment method of double-fed fan motor unit according to claim 4, which is characterized in that commented according to η size
Estimate maintenance level: as η > 0, system is stablized, and value is bigger, and maintenance level is higher；As η=0, system is neutrality；When
When η < 0, system is unstable, sub-synchronous oscillation diverging.
6. a kind of stability assessment system of double-fed fan motor unit, which is characterized in that including data acquisition module, port energy meter
Calculate module, Stability Assessment module and result output module；
The data acquisition module is for acquiring double-fed fan motor unit port voltage, electric current, active power and the time domain at locking phase angle
Variable quantity；
The port energy computation module is used to calculate the port energy of double-fed fan motor unit；
The Stability Assessment module assesses double-fed fan motor unit time, hypersynchronous stable water according to the positive and negative and size of Dissipation Strength
It is flat；
The result output module is for exporting the real-time port energy of double-fed fan motor unit and maintenance level.
7. the stability assessment system of double-fed fan motor unit according to claim 6, which is characterized in that the data acquisition
Module passes through the PMU device collection voltages, electric current, active power and the locking phase that are installed on double-fed fan motor unit port and phaselocked loop
The time domain variable quantity at angle.
8. the stability assessment system of double-fed fan motor unit according to claim 6, which is characterized in that the port energy
Computing module receives the data of data acquisition module input, and the port energy of double-fed fan motor unit is calculated based on following formula:
In formula: Δ W1For serial supplementary line dynamic power, Δ W2For phaselocked loop dynamic power, Δ PeHave for double-fed fan motor unit output
The time domain variable quantity of function power；Δ θ is the locking phase angle time domain variable quantity of double-fed fan motor unit phaselocked loop；Δud、Δuq、ΔidWith
ΔiqRespectively d, q axis time domain change component of the voltage and current Relative steady-state of double-fed fan motor unit output port；ω is d, q
Frequency of oscillation under axis.
9. the stability assessment system of double-fed fan motor unit according to claim 6, which is characterized in that the Stability Assessment
Module is according to the maintenance level of the size assessment system of η, comprising:
Step S1, port energy is subjected to discretization:
Obtain double-fed fan motor unit t1,……tnWhen port energy value Δ WDFIG(t1) ... ..., Δ WDFIG(tn)；N is data
Number；
Step S2, the port energy Δ W of discretization is utilizedDFIG(t1) ... ..., Δ WDFIG(tn), solve Dissipation Strength η；
Step S3, assess maintenance level according to η size: as η > 0, system is stablized, and value is bigger, and maintenance level is higher；Work as η
When=0, system is neutrality；As η < 0, system is unstable, sub-synchronous oscillation diverging.
10. the stability assessment system of double-fed fan motor unit according to claim 9, which is characterized in that the step S2
It specifically includes:
Step S201, the average value of the double-fed fan motor unit port energy of discretization is calculated using following formula:
Step S202, the port energy Δ W of obtained discretization is utilizedDFIG(t1) ... ..., Δ WDFIG(tn) and port energy is flat
Dissipation Strength is calculated based on following formula in mean value:
Wherein,For gradient signs.
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