CN109950930A - A kind of time-domain simulation method of doubly-fed wind turbine system sub-synchronous oscillation - Google Patents
A kind of time-domain simulation method of doubly-fed wind turbine system sub-synchronous oscillation Download PDFInfo
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- CN109950930A CN109950930A CN201910291979.5A CN201910291979A CN109950930A CN 109950930 A CN109950930 A CN 109950930A CN 201910291979 A CN201910291979 A CN 201910291979A CN 109950930 A CN109950930 A CN 109950930A
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Abstract
The present invention provides a kind of time-domain simulation method of the sub-synchronous oscillation of doubly-fed wind turbine system, step includes: the mathematical model that (1) establishes double-fed blower and transmission line of electricity；(2) initial data is read in；(3) Aerodynamics Model is derived；(4) rotor axial system model is derived；(5) generator model is derived；(6) transmission line of electricity series compensation degrees are set；(7) wind speed of every Fans is set；(8) simulation figure is exported.The present invention can be used for carrying out the sub-synchronous oscillation phenomenon generated containing doubly-fed wind turbine system time-domain-simulation, and then promotes the economy of transmission of electricity and safeguard that the stability of entire transmission system system is of great significance.
Description
Technical field
The present invention relates to the sub-synchronous oscillation of a kind of time-domain-simulation technology more particularly to doubly-fed wind turbine system when
Domain emulation technology.
Background technique
With the sustainable growth of population, economic fast development and the serious pollution of environment, demand of the mankind to the energy
Constantly aggravation, the reproducible new energy of Devoting Major Efforts To Developing cleanliness without any pollution have become the inevitable choice of various countries' prosperity development.Wind energy is
A kind of renewable energy that is inexhaustible, being had a surplus with it, the experts and scholars in worldwide pay close attention to it and pay attention to all with day
Increase.In recent years, the development of China Wind Power power generation was very fast, and large-scale development wind resource has become our national energy wars
Slightly indispensable a part.By the end of the end of the year in 2013, the installed capacity of wind-power electricity generation reached 91412MW, and wind-power electricity generation amount accounts for
The 3% of China's total power generation has become the third-largest energy of China.2016, other than Taiwan, what China newly increased
Wind-powered electricity generation installation amount up to 23,370,000 kilowatts, add up installation amount up to 1.69 hundred million kilowatts, compared to 2015, China North China, East China and
The wind-powered electricity generation adding new capacity accounting of ALFISOL IN CENTRAL has growth, and wherein East China accounting rises to 20% by 13%, Central-South
Regional accounting rises to 13% by 9%.
Since China territory is vast, vast territory and abundant resources, although wind resource is innumerable, distribution and its it is unbalanced, mainly throughout
In regions such as southeastern coast, northeast, North China and northwests.Therefore, transport over long distances extensive large capacity wind-powered electricity generation become must
So.
However, Wind turbines when being concatenated compensated line or DC power transmission line is incorporated to bulk power grid, can cause seriously
Sub-synchronous oscillation phenomenon, cause a large amount of blower off-grids, equipment damage, to system stability generate bad influence.
Summary of the invention
To solve the above-mentioned problems, the invention proposes a kind of time domains of the sub-synchronous oscillation of doubly-fed wind turbine system
Emulation mode, step include:
(1) mathematical model of double-fed blower is established；(2) initial data is read in；(3) Aerodynamics Model is derived；(4) it derives and turns
Sub- shafting model；(5) generator model is derived；(6) transmission line of electricity series compensation degrees are set；(7) wind speed of every Fans is set； (8)
Export simulation figure.
More preferably, the derivation Aerodynamics Model includes deriving mechanical output PMWith machine torque Tm。
More preferably, the derivation rotor axial system model includes deriving double quality blocks model.
More preferably, the derivation generator model includes that three phase static abc coordinate system is transformed into synchronous rotary dq coordinate
System.
More preferably, the series compensation degrees described in the time-domain simulation method of the sub-synchronous oscillation of above-mentioned doubly-fed wind turbine system
KcRespectively 20%, 35%, 55%.
More preferably, the setting described in the time-domain simulation method of the sub-synchronous oscillation of above-mentioned doubly-fed wind turbine system is every
The wind speed v of Fans is respectively 8.5m/s, 10.5m/s, 12m/s.
The time-domain simulation method of the sub-synchronous oscillation of doubly-fed wind turbine system provided by the present invention, can effectively needle
Time-domain-simulation is carried out to the sub-synchronous oscillation phenomenon that doubly-fed wind turbine system generates, using the analogous diagram of output to double-fed wind
The sub-synchronous oscillation situation of power generator system is analyzed and researched, and then promotes the economy and maintenance double-fed wind-force hair of transmission of electricity
The stability of electric system is of great significance.
Detailed description of the invention
Fig. 1 is the time-domain-simulation flow chart that one embodiment of the invention is related to；
Fig. 2 is the system simulation model figure that one embodiment of the invention is related to；
Fig. 3 is the double quality blocks model structure schematic diagram that one embodiment of the invention is related to；
Fig. 4 is system output current waveform when series compensation degrees are 20% in analogous diagram that one embodiment of the invention is related to；
Fig. 5 is system output current waveform when series compensation degrees are 35% in analogous diagram that one embodiment of the invention is related to；
Fig. 6 is system output current waveform when series compensation degrees are 55% in analogous diagram that one embodiment of the invention is related to；
Fig. 7 is system output current waveform when blower wind speed is 8.5m/s in analogous diagram that one embodiment of the invention is related to；
Fig. 8 is system output current waveform when blower wind speed is 10.5m/s in analogous diagram that one embodiment of the invention is related to；
Fig. 9 is system output current waveform when blower wind speed is 12m/s in analogous diagram that one embodiment of the invention is related to.
Specific embodiment
Of the invention is described in detail with reference to the accompanying drawings and examples.
As shown in Figure 1, the present invention provides a kind of time-domain simulation method of doubly-fed wind turbine system sub-synchronous oscillation,
Its step includes:
(1) mathematical model of double-fed blower and transmission line of electricity is established；(2) initial data is read in；(3) aerodynamics mould is derived
Type；(4) rotor axial system model is derived；(5) generator model is derived；(6) transmission line of electricity series compensation degrees are set；(7) every typhoon is set
The wind speed of machine；(8) simulation figure is exported.
It is specifically described below for above-mentioned steps.
One, the mathematical model of double-fed blower and transmission line of electricity is established
In order to obtain the time-domain-simulation situation of subsynchronous resonance, the mathematical model of whole system is initially set up.Referring to attached drawing 2, build
The mathematical model of vertical whole system, including double-fed blower and transmission line of electricity two large divisions are constituted.Wherein model of power transmission system is by electricity
Resistance, inductance and capacitor composition, double-fed blower model contain Aerodynamics Model, rotor axial system model, generator model again.
(1) Aerodynamics Model
It is a complicated process that the kinetic energy that blower intercepts and captures in air, which is converted into mechanical energy, is related to hydrodynamics, air force
Learn etc..According to generator electric characteristic, the Aerodynamics Model that can be simplified.
According to aerodynamics, the ability that air flows through blower be may be expressed as:
PW=0.5 ρ AVW 3 (1)
In formula (1), PWIndicate wind energy conversion system mechanical output, ρ is atmospheric density, and A is the area that wind wheel blade rotation is passed through, VWFor note
Enter wind speed.Since the wind energy by fan blade is only partially converted to mechanical energy, power coefficient C is definedPIndicate that blower will move
It can be converted into the transformation efficiency of mechanical energy, can be acquired with following formula:
In formula (2) (3) (4), λ indicates that tip speed ratio, β indicate blade pitch angle, ωRIndicate blower angular velocity of rotation.Thus may be used
Obtain the input mechanical output of blower are as follows:
PM=0.5CP(λ, β) ρ AVW 3 (5)
Machine torque can be obtained by the expression formula of mechanical output are as follows:
Tm=0.5CPπR3ρVW 2/λ (6)
(2) rotor axial system model
According to different shafting modeling patterns, machine driven system can be divided into single mass model, double quality blocks model and three matter
Gauge block model.When studying the sub-synchronous oscillation problem of double-fed fan motor unit, since second order resonance frequency is very high, amplitude very little, because
This establishes double quality blocks model and is enough to imitate machine driven system.
The double quality blocks model structure of Wind turbines shafting is as shown in figure 3, its mathematical model can be expressed as follows:
In formula (7) (8) (9), HgAnd HtRespectively represent the inertia time constant of generator and wind energy conversion system；KsFor the rigidity system of shafting
Number；DgAnd DtRespectively represent the rotor damped coefficient of generator and wind energy conversion system；θsFor the relative angular displacement between two mass blocks； Te
And TtThe respectively machine torque of generator and wind energy conversion system；ωt、ωrAnd ωbRespectively represent wind energy conversion system revolving speed, generator speed and
Frequency reference value.
(3) generator model
When establishing doubly-fed wind turbine model, rotor follows Motor convention.For cylinder model, become using Park
It changes, three phase static abc coordinate system is transformed into the research for carrying out model under synchronous rotary dq coordinate system.
After crossing conversion, obtain under synchronous rotary dq coordinate system, generator stator-rotator voltage equation is as follows:
Rotor flux linkage equations are as follows:
In formula (10)-(17), usd、usq、urd、urqRespectively represent the component of voltage that rotor is located on dq axis, isd、isq、
ird、irqRespectively rotor is located at the current component on dq axis,It respectively represents rotor and is located at dq
Magnetic linkage component on axis, ωs、ωrRespectively represent the electrical angular speed of rotor, Rs、RrRespectively represent fixed rotor resistance, Ls、
Lr、LmRespectively represent the equivalent self inductance and mutual inductance that rotor is located under synchronous rotary dq coordinate system.
Two, the wind speed of transmission line of electricity series compensation degrees, every Fans is set
About being described as follows for arrangement above factor:
1, the initial data read in includes rated voltage, rated capacity, stator resistance, rotor resistance, stator leakage inductance, turns
Sub- leakage inductance, magnetizing inductance, line resistance, line inductance, line capacitance etc..
2, the series compensation degrees of transmission line of electricity are arranged is respectively 20%, 35% and 55%.
3, the wind speed of every Fans is arranged is respectively 8.5m/s, 10.5m/s and 12m/s.
Three, simulation example and interpretation of result
For system model to be studied as shown in Fig. 2, doubly-fed wind turbine parameter is listed in Table 1 below, the parameter of transmission line of electricity is listed in table 2
In.
Certain the double-fed wind power generator group parameter of table 1 (removes fN, voltage rating, outside rated capacity be per unit value)
2 transmission line parameter of table
Fig. 4 to Fig. 9 gives system above simulation result, and comprehensive analysis Fig. 4 to Fig. 6 is it is found that with transmission line of electricity series compensation degrees
Increase, system oscillation frequency becomes larger and sub-synchronous oscillation is more serious.Fig. 7 to Fig. 9 it is found that blower wind speed increase, can all make
System stability reduces to improve the stability of transmission system entirety and should reduce wind speed from bus rod remotely blower.
The sub-synchronous oscillation phenomenon occurred in doubly-fed wind turbine system is often by inappropriate series compensation capacitance and wind
Caused by speed, therefore it is directed to specific system, selects suitable compensativity and wind speed for containing double-fed wind turbine power generation machine system
Stability is of great significance, and only in this way could preferably improve the great function of transmission distance and transmission line capability.
Claims (6)
1. a kind of time-domain simulation method of doubly-fed wind turbine system sub-synchronous oscillation, step include:
(1) mathematical model of double-fed blower and transmission line of electricity is established；(2) initial data is read in；(3) aerodynamics mould is derived
Type；(4) rotor axial system model is derived；(5) generator model is derived；(6) transmission line of electricity series compensation degrees are set；(7) every typhoon is set
The wind speed of machine；(8) simulation figure is exported.The present invention can be used for the sub-synchronous oscillation phenomenon generated to doubly-fed wind turbine system
Time-domain-simulation is carried out, and then promotes the economy of transmission of electricity and safeguards that the stability of entire transmission system system is of great significance.
2. the time-domain simulation method of doubly-fed wind turbine system sub-synchronous oscillation according to claim 1, it is characterised in that:
The derivation Aerodynamics Model includes deriving mechanical output PMWith machine torque Tm。
3. the time-domain simulation method of doubly-fed wind turbine system sub-synchronous oscillation, feature exist according to claim 1
In:, the derivation rotor axial system model includes building double quality blocks model.
4. the time-domain simulation method of doubly-fed wind turbine system sub-synchronous oscillation according to claim 1, it is characterised in that:
The derivation generator model includes that three phase static abc coordinate system is transformed into synchronous rotary dq coordinate system.
5. the time-domain simulation method of doubly-fed wind turbine system sub-synchronous oscillation according to claim 1, it is characterised in that:
The series compensation degrees KcRespectively 20%, 35%, 55%.
6. the time-domain simulation method of doubly-fed wind turbine system sub-synchronous oscillation according to claim 1, it is characterised in that:
The wind speed v of the every Fans of setting is respectively 8.5m/s, 10.5m/s, 12m/s.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112383252A (en) * | 2020-10-30 | 2021-02-19 | 华北电力科学研究院有限责任公司 | Per unit method and device for double-fed generator set excitation control system |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106059422A (en) * | 2016-07-22 | 2016-10-26 | 南京理工大学 | Fuzzy control method for double-fed electric field subsynchronous oscillation inhibition |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106059422A (en) * | 2016-07-22 | 2016-10-26 | 南京理工大学 | Fuzzy control method for double-fed electric field subsynchronous oscillation inhibition |
Non-Patent Citations (1)
| Title |
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| 刘文: "风电场次同步谐振仿真分析与抑制研究", 《中国优秀硕士学位论文全文数据库工程科技Ⅱ辑》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112383252A (en) * | 2020-10-30 | 2021-02-19 | 华北电力科学研究院有限责任公司 | Per unit method and device for double-fed generator set excitation control system |
| CN112383252B (en) * | 2020-10-30 | 2022-05-06 | 华北电力科学研究院有限责任公司 | Per unit method and device for double-fed generator set excitation control system |
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Application publication date: 20190628 |