CN109524994A - A kind of control method and system improving double-fed fan motor interconnected electric power system false voltage - Google Patents
A kind of control method and system improving double-fed fan motor interconnected electric power system false voltage Download PDFInfo
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Abstract
The invention discloses a kind of control methods for improving double-fed fan motor interconnected electric power system false voltage.It includes following steps: (1) calculating double-fed fan motor unit in the electrical quantity combination electrical network parameter of instant of failure and calculate the position and transition resistance that failure occurs；(2) active power controller reference value needed for maximum false voltage in double-fed fan motor unit Power control range is calculated；(3) Reactive Power Control reference value needed for maximum false voltage in double-fed fan motor unit Power control range is calculated；(4) double-fed fan motor unit rotor-side converter exterior ring power reference value is switched to the value and power reference of calculating, i.e., implementable control in failure generation moment.For the deficiency of existing double-fed fan motor unit voltage control method, the present invention can accurately portray the power control capabilities of double-fed fan motor unit during failure, false voltage can be promoted to the maximum extent in its Power control range, the low pressure off-grid for effectively avoiding new energy power supply, the network voltage after being conducive to failure restore.
Description
Technical field
The present invention relates to protecting electrical power systems and control field, refer specifically to a kind of raising double-fed fan motor interconnected electric power system event
The control method and system for hindering voltage, belong to electrical power system transient control field.
Background technique
Double-fed fan motor unit electric part is mainly made of influence generator and back-to-back converter, wherein back-to-back unsteady flow
Device side is connect with power grid, and side provides excitation for influence generator.The quick ability of regulation and control for having benefited from current transformer, in power grid event
Hinder lower double-fed fan motor unit and possesses stronger power control capabilities and voltage support ability.
Based on the requirement of wind-electricity integration directive/guide, wind power plant needs to provide 1.5 (0.9-U for power grid in the event of a failures) times
Reactive current.To meet this requirement, installing reactive power compensator additional is one of effective way, but this method additionally increases device
And cost, while the problem of may cause high voltage off-grid caused by reactive power compensator excision not in time after failure removal.Mirror
In the quick ability of regulation and control of double-fed fan motor unit, there is scholar to propose using the idle fan-out capability of double-fed fan motor unit itself to be electricity
Net provides support.Part document realizes the promotion of the idle fan-out capability of double-fed fan motor unit by improving controller architecture.Separately
Outer also part document is extended by the excavation of discussion, transient state power limit to double-fed fan motor unit power constraints
The available reactive power capability of double-fed fan motor unit, leading to overpowering optimization distribution realizes making full use of for double-fed fan motor unit ability
With effective support to network voltage.For the reactive power auxiliary service for sufficiently excavating double-fed fan motor unit under fault condition, people is studied
Member has made a large amount of effort, mainly discusses the limitation of stator current heat, rotor maximum allowed current, PWM modulation mode, winding
The influences of the factors to double-fed fan motor unit power bracket such as loss.Under vector oriented control strategy, stator power, which is controlled by, to be turned
Electron current, and then limited by rotor-side maximum allowed current.In addition double-fed fan motor unit transient power range is also limited to
Set end voltage, set end voltage is higher, and transient power range is bigger, and reactive power auxiliary service is also bigger.Existing research is in analysis double-fed
The constraint inside unit is concentrated merely on when Wind turbines transient power range, using set end voltage as static external condition.It is existing
There is the voltage control method based on double-fed fan motor unit transient power range to generally use the maximum reactive power in power bracket,
But the promotion effect to transient state network voltage is not quantified.
With the raising of double-fed fan motor unit permeability and the abundant exploitation of its power control capabilities, source net coupling is increasingly
Enhancing, double-fed fan motor unit output transient power changes the trend distribution of power grid, and electric network swim acts on pair in turn
Present the set end voltage of Wind turbines.Double-fed fan motor unit set end voltage becomes at this time joins about its active and reactive power dynamic
Number, transient power range will also change.Power grid is not yet considered in the existing research to double-fed fan motor unit power bracket
The influence of trend, acquired results may be inaccurate, and the voltage control method based on power controlled range is not also because considering power grid
The variation of double-fed fan motor unit transient power range under influence on tidal flow and be unable to fully the transient voltage using double-fed fan motor unit
Enabling capabilities.
Summary of the invention
In view of the above shortcomings of the prior art, the invention discloses a kind of raising double-fed fan motor interconnected electric power system failure electricity
The control method of pressure calculates failure hair in the electrical quantity combination electrical network parameter of instant of failure according to calculating double-fed fan motor unit first
Raw position and transition resistance；Then it calculates in double-fed fan motor unit Power control range needed for attainable maximum false voltage
Active power controller reference value, this calculation method fully considered the coupling of double-fed fan motor unit and power grid, by point
The support effect of different operating points in Power control range in the case of current failure is analysed, so that it is determined that being able to achieve maximum failure electricity
The active power of pressure；Then it calculates idle needed for attainable maximum false voltage in double-fed fan motor unit Power control range
Power control reference；Moment finally occurs by the switching of double-fed fan motor unit rotor-side converter exterior ring power reference value in failure
For the value and power reference of calculating, i.e., implementable control.The present invention sufficiently count and electric network fault during electric network composition and parameter pair
The influence of double-fed fan motor unit Power control range can accurately portray the power control energy of double-fed fan motor unit during failure
Power promotes false voltage in its Power control range to the maximum extent, can effectively avoid the low pressure off-grid of new energy power supply, has
Restore conducive to the network voltage after failure.
In order to solve the above-mentioned technical problem, present invention employs the following technical solutions:
A kind of control method improving double-fed fan motor interconnected electric power system false voltage, this method mainly includes following step
It is rapid:
S101, the set end voltage amplitude of real-time measurement double-fed fan motor unit and phase and active and reactive power, based on electricity
The route that the electrical quantity of network parameters, unit parameter and double-fed fan motor unit instant of failure calculates short dot to double-fed fan motor unit is long
Degree accounts for the ratio α and transition resistance R of total track lengthf；
The route that S102, the electrical quantity based on double-fed fan motor unit instant of failure calculate short dot to double-fed fan motor unit is long
Degree accounts for the ratio α and transition resistance R of total track lengthf, it is calculated as reaching in Power control range maximum false voltage Usf.maxIt is required
Double-fed fan motor unit active power controller reference value Psf.mv；
The route that S103, the electrical quantity based on double-fed fan motor unit instant of failure calculate short dot to double-fed fan motor unit is long
Degree accounts for the ratio α and transition resistance R of total track lengthf, it is calculated as reaching in Power control range maximum false voltage Usf.maxIt is required
Double-fed fan motor unit Reactive Power Control reference value Qsf.mv；
S104, double-fed fan motor unit rotor-side converter exterior ring power reference value switched by steady-state value when failure occurs
For Psf.mvAnd Qsf.mv, to implement to control.
It preferably, is to reach maximum false voltage U in Power control range in step S102sf.maxRequired double-fed fan motor
Unit active power controller reference value Psf.mvCalculation formula be
In formula, middle coefficient Yrc1、Yrc2、Irc、Ypf1、Ypf2、IpfRespectively
Wherein Rs、XsStator winding resistance and equivalent reactance are respectively indicated,XmFor excitation reactance；IrmaxFor
Rotor current maximum permissible value；X'g=(1- α) Xl+Xg+XTg, X'd=α Xl+XTd, wherein XTgAnd XTdRespectively connect power transmission line
It is anti-with the transformer reactance and double-fed fan motor unit voltage boosting transforming of equivalent power grid；UgFor equivalent grid voltage amplitude, XgFor equivalent electricity
Net equivalent reactance；XlFor the power transmission line overall length reactance of double-fed fan motor unit to equivalent power grid；All equal reduction of impedance are to same electricity
Press grade；The calculation formula of intermediate parameters A, B, C, D, E and F is
It preferably, is to reach maximum false voltage U in Power control range in step S103sf.maxRequired double-fed fan motor
Unit Reactive Power Control reference value Qsf.mvCalculation formula be
In formula:
Middle coefficient Yrc1、Yrc2、Irc、Ypf1、Ypf2、IpfRespectively
Wherein Rs、XsStator winding resistance and equivalent reactance are respectively indicated,XmFor excitation reactance；Irmax
For rotor current maximum permissible value；X'g=(1- α) Xl+Xg+XTg, X'd=α Xl+XTd, wherein XTgAnd XTdRespectively connection transmission of electricity
The transformer reactance and double-fed fan motor unit voltage boosting transforming of line and equivalent power grid are anti-；UgFor equivalent grid voltage amplitude, XgFor equivalence
Power grid equivalent reactance；XlFor the power transmission line overall length reactance of double-fed fan motor unit to equivalent power grid；All equal reduction of impedance are to same
Voltage class.
Preferably, accessible maximum false voltage U in double-fed fan motor unit Power control rangesf.maxCalculation formula
For
In formula,
Middle coefficient Yrc1、Yrc2、Irc、Ypf1、Ypf2、IpfRespectively
Wherein Rs、XsStator winding resistance and equivalent reactance are respectively indicated,XmFor excitation reactance；Irmax
For rotor current maximum permissible value；X'g=(1- α) Xl+Xg+XTg, X'd=α Xl+XTd, wherein XTgAnd XTdRespectively connection transmission of electricity
The transformer reactance and double-fed fan motor unit voltage boosting transforming of line and equivalent power grid are anti-；UgFor equivalent grid voltage amplitude, XgFor equivalence
Power grid equivalent reactance；XlFor the power transmission line overall length reactance of double-fed fan motor unit to equivalent power grid；All equal reduction of impedance are to same
Voltage class；The calculation formula of intermediate parameters A, B, C, D, E and F is
The invention also discloses a kind of control system for improving double-fed fan motor interconnected electric power system false voltage, the controls
System includes:
Measuring unit, set end voltage amplitude and phase and active and idle function for real-time measurement double-fed fan motor unit
Rate；
First computing unit, for the electrical quantity based on electrical network parameter, unit parameter and double-fed fan motor unit instant of failure
The line length for calculating short dot to double-fed fan motor unit accounts for the ratio α and transition resistance R of total track lengthf；
Second computing unit calculates short dot to double-fed fan motor for the electrical quantity based on double-fed fan motor unit instant of failure
The line length of unit accounts for the ratio α and transition resistance R of total track lengthf, it is calculated as reaching in Power control range maximum failure
Voltage Usf.maxRequired double-fed fan motor unit active power controller reference value Psf.mv；
Third computing unit calculates short dot to double-fed fan motor for the electrical quantity based on double-fed fan motor unit instant of failure
The line length of unit accounts for the ratio α and transition resistance R of total track lengthf, it is calculated as reaching in Power control range maximum failure
Voltage Usf.maxRequired double-fed fan motor unit Reactive Power Control reference value Qsf.mv；
Control unit is used for double-fed fan motor unit rotor-side converter exterior ring power reference value when failure occurs by steady
State value is switched to Psf.mvAnd Qsf.mv, to implement to control.
Preferably, second computing unit is based on formula
Double-fed fan motor unit active power controller needed for being calculated as reaching in Power control range maximum false voltage is joined
Examine value Psf.mv；
In formula, middle coefficient Yrc1、Yrc2、Irc、Ypf1、Ypf2、IpfRespectively
Wherein Rs、XsStator winding resistance and equivalent reactance are respectively indicated,XmFor excitation reactance；Irmax
For rotor current maximum permissible value；X'g=(1- α) Xl+Xg+XTg, X'd=α Xl+XTd, wherein XTgAnd XTdRespectively connection transmission of electricity
The transformer reactance and double-fed fan motor unit voltage boosting transforming of line and equivalent power grid are anti-；UgFor equivalent grid voltage amplitude, XgFor equivalence
Power grid equivalent reactance；XlFor the power transmission line overall length reactance of double-fed fan motor unit to equivalent power grid；All equal reduction of impedance are to same
Voltage class；The calculation formula of intermediate parameters A, B, C, D, E and F is
Preferably, the third computing unit is based on formula
Double-fed fan motor unit Reactive Power Control needed for being calculated as reaching in Power control range maximum false voltage is joined
Examine value Qsf.mv:
In formula:
Middle coefficient Yrc1、Yrc2、Irc、Ypf1、Ypf2、IpfRespectively
Wherein Rs、XsStator winding resistance and equivalent reactance are respectively indicated,XmFor excitation reactance；Irmax
For rotor current maximum permissible value；X'g=(1- α) Xl+Xg+XTg, X'd=α Xl+XTd, wherein XTgAnd XTdRespectively connection transmission of electricity
The transformer reactance and double-fed fan motor unit voltage boosting transforming of line and equivalent power grid are anti-；UgFor equivalent grid voltage amplitude, XgFor equivalence
Power grid equivalent reactance；XlFor the power transmission line overall length reactance of double-fed fan motor unit to equivalent power grid；All equal reduction of impedance are to same
Voltage class.
Compared with prior art, the invention has the following beneficial effects:
The present invention propose it is a kind of improve double-fed fan motor interconnected electric power system false voltage control method, can sufficiently count and
The influence of electric network composition and parameter to double-fed fan motor unit Power control range during electric network fault, can accurately portray double-fed wind
Power control capabilities of the motor group under electric network fault；It proposes using maximum transient network voltage as the power control side of target
Method can make full use of the power control capabilities of double-fed fan motor unit, farthest improve power grid in its Power control range
False voltage.
Detailed description of the invention
In order to keep the purposes, technical schemes and advantages of invention clearer, the present invention is made into one below in conjunction with attached drawing
The detailed description of step, in which:
Fig. 1 is a kind of one kind of control method for improving double-fed fan motor interconnected electric power system false voltage disclosed by the invention
The flow chart of specific embodiment.
Fig. 2-double-fed fan motor unit grid-connected system instance graph of the present invention.
Fig. 3-double-fed fan motor unit grid-connected system equivalent circuit diagram.
Fig. 4-double-fed fan motor unit grid-connected system transient voltage control block diagram.
Fig. 5-this method and tradition only control effect contrast figure of the method to point of common coupling voltage increase of reactive power.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawing.
As shown in Figure 1, the invention discloses a kind of control method for improving double-fed fan motor interconnected electric power system false voltage,
This method mainly comprises the steps that
S101, the set end voltage amplitude of real-time measurement double-fed fan motor unit and phase and active and reactive power, based on electricity
The route that the electrical quantity of network parameters, unit parameter and double-fed fan motor unit instant of failure calculates short dot to double-fed fan motor unit is long
Degree accounts for the ratio α and transition resistance R of total track lengthf；
The route that S102, the electrical quantity based on double-fed fan motor unit instant of failure calculate short dot to double-fed fan motor unit is long
Degree accounts for the ratio α and transition resistance R of total track lengthf, it is calculated as reaching in Power control range maximum false voltage Usf.maxIt is required
Double-fed fan motor unit active power controller reference value Psf.mv；
This calculation method has fully considered the coupling of double-fed fan motor unit and power grid, by analyzing current failure situation
The support effect of different operating points in lower Power control range, so that it is determined that being able to achieve the active power of maximum false voltage.
The route that S103, the electrical quantity based on double-fed fan motor unit instant of failure calculate short dot to double-fed fan motor unit is long
Degree accounts for the ratio α and transition resistance R of total track lengthf, it is calculated as reaching in Power control range maximum false voltage Usf.maxIt is required
Double-fed fan motor unit Reactive Power Control reference value Qsf.mv；
S104, double-fed fan motor unit rotor-side converter exterior ring power reference value switched by steady-state value when failure occurs
For Psf.mvAnd Qsf.mv, to implement to control.
Controlling in research for the existing transient state to double-fed fan motor unit not yet considers electric network swim to unit set end voltage
Influence, lead to double-fed fan motor unit transient power range inaccuracy, be unable to fully effectively be promoted using its power control capabilities
The problem of network voltage, the invention proposes a kind of control method for improving double-fed fan motor interconnected electric power system false voltage, energy
The influence of electric network composition and parameter to double-fed fan motor unit Power control range during enough sufficiently meters and electric network fault, can be accurate
Portray power control capabilities of the double-fed fan motor unit under electric network fault；It proposes using maximum transient network voltage as the electricity of target
Control method and its control system are pressed, the power control capabilities of double-fed fan motor unit can be made full use of, in its Power control range
Inside farthest improve electric network fault voltage.
When it is implemented, being to reach maximum false voltage U in Power control range in step S102sf.maxRequired double-fed
Wind turbines active power controller reference value Psf.mvCalculation formula be
In formula, middle coefficient Yrc1、Yrc2、Irc、Ypf1、Ypf2、IpfRespectively
Wherein Rs、XsStator winding resistance and equivalent reactance are respectively indicated,XmFor excitation reactance；Irmax
For rotor current maximum permissible value；X'g=(1- α) Xl+Xg+XTg, X'd=α Xl+XTd, wherein XTgAnd XTdRespectively connection transmission of electricity
The transformer reactance and double-fed fan motor unit voltage boosting transforming of line and equivalent power grid are anti-；UgFor equivalent grid voltage amplitude, XgFor equivalence
Power grid equivalent reactance；XlFor the power transmission line overall length reactance of double-fed fan motor unit to equivalent power grid；All equal reduction of impedance are to same
Voltage class；The calculation formula of intermediate parameters A, B, C, D, E and F is
When it is implemented, being to reach maximum false voltage U in Power control range in step S103sf.maxRequired double-fed
Wind turbines Reactive Power Control reference value Qsf.mvCalculation formula be
In formula:
Middle coefficient Yrc1、Yrc2、Irc、Ypf1、Ypf2、IpfRespectively
Wherein Rs、XsStator winding resistance and equivalent reactance are respectively indicated,XmFor excitation reactance；Irmax
For rotor current maximum permissible value；X'g=(1- α) Xl+Xg+XTg, X'd=α Xl+XTd, wherein XTgAnd XTdRespectively connection transmission of electricity
The transformer reactance and double-fed fan motor unit voltage boosting transforming of line and equivalent power grid are anti-；UgFor equivalent grid voltage amplitude, XgFor equivalence
Power grid equivalent reactance；XlFor the power transmission line overall length reactance of double-fed fan motor unit to equivalent power grid；All equal reduction of impedance are to same
Voltage class.
When it is implemented, accessible maximum false voltage U in double-fed fan motor unit Power control rangesf.maxCalculating
Formula is
In formula,
Middle coefficient Yrc1、Yrc2、Irc、Ypf1、Ypf2、IpfRespectively
Wherein Rs、XsStator winding resistance and equivalent reactance are respectively indicated,XmFor excitation reactance；Irmax
For rotor current maximum permissible value；X'g=(1- α) Xl+Xg+XTg, X'd=α Xl+XTd, wherein XTgAnd XTdRespectively connection transmission of electricity
The transformer reactance and double-fed fan motor unit voltage boosting transforming of line and equivalent power grid are anti-；UgFor equivalent grid voltage amplitude, XgFor equivalence
Power grid equivalent reactance；XlFor the power transmission line overall length reactance of double-fed fan motor unit to equivalent power grid；All equal reduction of impedance are to same
Voltage class；The calculation formula of intermediate parameters A, B, C, D, E and F is
Control method of the present invention is introduced with double-fed fan motor unit grid-connected system (as shown in Figures 2 and 3) below
Implement, the specific steps are that:
1, double-fed fan motor unit parameter and each component parameters of electric system are inputted
The double-fed fan motor unit parameter that need to be inputted includes:
Preset parameter: rated capacity；Stator and rotor voltage rating；Stator and rotor resistance parameters；Stator and rotor leakage inductance；Magnetizing inductance；It rises
Pressure transformer forward-sequence reactance；
Operating parameter before failure: stator and rotor current；Operating air velocity；
Each parameter of the electric system of input includes: transmission line of electricity impedance；System equivalent impedance；Power grid before failure occurs is electric
Pressure.
2, the electrical quantity of instant of failure double-fed fan motor unit, including set end voltage amplitude, phase angle and active and reactive function are measured
Rate, and electrical network parameter is combined to calculate location of short circuit and transition resistance:
The calculating formula that the line length of short dot to double-fed fan motor unit accounts for the ratio α of total track length is
In formula,
λ1=U2sf0-UgUsf0cosθsf0+(X′g+X′d)Qsf0, λ2=UgUsf0sinθsf0+(X′g+X′d)Psf0
Wherein, Usf0And θsf0The respectively double-fed fan motor unit set end voltage amplitude and phase angle of instant of failure measurement；Psf0With
Qsf0Respectively instant of failure measurement double-fed fan motor unit is active and reactive power；X′g=(1- α) Xl+Xg+XTg, X 'd=α Xl+
XTd, wherein XTgAnd XTdThe transformer reactance and double-fed fan motor unit voltage boosting transforming of respectively connection power transmission line and equivalent power grid are anti-；
UgFor equivalent grid voltage amplitude, XgFor equivalent power grid equivalent reactance；XlPower transmission line for double-fed fan motor unit to equivalent power grid is complete
Long reactance；RfFor transition resistance.All equal reduction of impedance are to same voltage class.
Transition resistance RfCalculating formula are as follows:
3, double-fed fan motor unit active power controller needed for being calculated as reaching in Power control range maximum false voltage
Reference value Psf.mv.Calculation method is
In formula,
Yrc1=-Rs/ Z2s, Yrc2=-Xs/ Z2s, Irc=XmIrmax/Zs
Wherein Rs、XsStator winding resistance and equivalent reactance are respectively indicated,XmFor excitation reactance；IrmaxFor
Rotor current maximum permissible value；Xg'=(1- α) Xl+Xg+XTg, Xd'=α Xl+XTd, wherein XTgAnd XTdRespectively connect power transmission line
It is anti-with the transformer reactance and double-fed fan motor unit voltage boosting transforming of equivalent power grid；UgFor equivalent grid voltage amplitude, XgFor equivalent electricity
Net equivalent reactance；XlFor the power transmission line overall length reactance of double-fed fan motor unit to equivalent power grid, α indicates short dot to double-fed fan motor machine
The line length of group accounts for the ratio of total track length；RfFor transition resistance.All equal reduction of impedance are to same voltage class.
The calculation method of parameter A, B, C, D, E and F is
4, double-fed fan motor unit Reactive Power Control needed for being calculated as reaching in Power control range maximum false voltage
Reference value Qsf.mv.Calculation method is
5, failure occur moment by double-fed fan motor unit rotor-side converter exterior ring power reference value be set as step 3 and
The value and power reference P calculated in 4sf.mvAnd Qsf.mv, i.e., implementable control, control block diagram is as shown in Figure 4.
The comparison of this method that Fig. 5 is transition resistance when being 100 Ω and the tradition only method grid entry point voltage of control reactive power,
Grid entry point voltage reaches 0.8931p.u. under context of methods, and grid entry point voltage is 0.8382p.u., context of methods under conventional method
6.55% is promoted compared to conventional method.
The invention also discloses a kind of control system for improving double-fed fan motor interconnected electric power system false voltage, the controls
System includes:
Measuring unit, set end voltage amplitude and phase and active and idle function for real-time measurement double-fed fan motor unit
Rate；
First computing unit, for the electrical quantity based on electrical network parameter, unit parameter and double-fed fan motor unit instant of failure
The line length for calculating short dot to double-fed fan motor unit accounts for the ratio α and transition resistance R of total track lengthf；
Second computing unit calculates short dot to double-fed fan motor for the electrical quantity based on double-fed fan motor unit instant of failure
The line length of unit accounts for the ratio α and transition resistance R of total track lengthf, it is calculated as reaching in Power control range maximum failure
Voltage Usf.maxRequired double-fed fan motor unit active power controller reference value Psf.mv；
Third computing unit calculates short dot to double-fed fan motor for the electrical quantity based on double-fed fan motor unit instant of failure
The line length of unit accounts for the ratio α and transition resistance R of total track lengthf, it is calculated as reaching in Power control range maximum failure
Voltage Usf.maxRequired double-fed fan motor unit Reactive Power Control reference value Qsf.mv；
Control unit is used for double-fed fan motor unit rotor-side converter exterior ring power reference value when failure occurs by steady
State value is switched to Psf.mvAnd Qsf.mv, to implement to control.
When it is implemented, second computing unit is based on formula
Double-fed fan motor unit active power controller needed for being calculated as reaching in Power control range maximum false voltage is joined
Examine value Psf.mv；
In formula, middle coefficient Yrc1、Yrc2、Irc、Ypf1、Ypf2、IpfRespectively
Wherein Rs、XsStator winding resistance and equivalent reactance are respectively indicated,XmFor excitation reactance；Irmax
For rotor current maximum permissible value；X'g=(1- α) Xl+Xg+XTg, X'd=α Xl+XTd, wherein XTgAnd XTdRespectively connection transmission of electricity
The transformer reactance and double-fed fan motor unit voltage boosting transforming of line and equivalent power grid are anti-；UgFor equivalent grid voltage amplitude, XgFor equivalence
Power grid equivalent reactance；XlFor the power transmission line overall length reactance of double-fed fan motor unit to equivalent power grid；All equal reduction of impedance are to same
Voltage class；The calculation formula of intermediate parameters A, B, C, D, E and F is
When it is implemented, the third computing unit is based on formula
Double-fed fan motor unit Reactive Power Control needed for being calculated as reaching in Power control range maximum false voltage is joined
Examine value Qsf.mv:
In formula:
Middle coefficient Yrc1、Yrc2、Irc、Ypf1、Ypf2、IpfRespectively
Wherein Rs、XsStator winding resistance and equivalent reactance are respectively indicated,XmFor excitation reactance；Irmax
For rotor current maximum permissible value；X'g=(1- α) Xl+Xg+XTg, X'd=α Xl+XTd, wherein XTgAnd XTdRespectively connection transmission of electricity
The transformer reactance and double-fed fan motor unit voltage boosting transforming of line and equivalent power grid are anti-；UgFor equivalent grid voltage amplitude, XgFor equivalence
Power grid equivalent reactance；XlFor the power transmission line overall length reactance of double-fed fan motor unit to equivalent power grid；All equal reduction of impedance are to same
Voltage class.
Finally, it is stated that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting, although passing through ginseng
According to the preferred embodiment of the present invention, invention has been described, it should be appreciated by those of ordinary skill in the art that can
To make various changes to it in the form and details, without departing from the present invention defined by the appended claims
Spirit and scope.
Claims (7)
1. a kind of control method for improving double-fed fan motor interconnected electric power system false voltage, which is characterized in that this method is mainly wrapped
Include following steps:
S101, the set end voltage amplitude of real-time measurement double-fed fan motor unit and phase and active and reactive power are joined based on power grid
The line length that the electrical quantity of number, unit parameter and double-fed fan motor unit instant of failure calculates short dot to double-fed fan motor unit accounts for
The ratio α and transition resistance R of total track lengthf；
The line length that S102, the electrical quantity based on double-fed fan motor unit instant of failure calculate short dot to double-fed fan motor unit accounts for
The ratio α and transition resistance R of total track lengthf, it is calculated as reaching in Power control range maximum false voltage Usf.maxRequired is double
Present Wind turbines active power controller reference value Psf.mv；
The line length that S103, the electrical quantity based on double-fed fan motor unit instant of failure calculate short dot to double-fed fan motor unit accounts for
The ratio α and transition resistance R of total track lengthf, it is calculated as reaching in Power control range maximum false voltage Usf.maxRequired is double
Present Wind turbines Reactive Power Control reference value Qsf.mv；
S104, double-fed fan motor unit rotor-side converter exterior ring power reference value is switched to by steady-state value when failure occurs
Psf.mvAnd Qsf.mv, to implement to control.
2. a kind of control method for improving double-fed fan motor interconnected electric power system false voltage as described in claim 1, feature
It is, reaches maximum false voltage U in Power control range in step S102sf.maxRequired double-fed fan motor unit wattful power
Rate controls reference value Psf.mvCalculation formula be
In formula, middle coefficient Yrc1、Yrc2、Irc、Ypf1、Ypf2、IpfRespectively
Irc=XmIrmax/Zs
Wherein Rs、XsStator winding resistance and equivalent reactance are respectively indicated,XmFor excitation reactance；IrmaxFor rotor
Electric current maximum permissible value；X'g=(1- α) Xl+Xg+XTg, X'd=α Xl+XTd, wherein XTgAnd XTdIt respectively connects power transmission line and waits
Transformer reactance and the double-fed fan motor unit voltage boosting transforming for being worth power grid are anti-；UgFor equivalent grid voltage amplitude, XgFor equivalent power grid etc.
Imitate reactance；XlFor the power transmission line overall length reactance of double-fed fan motor unit to equivalent power grid；All equal reduction of impedance are to same voltage etc.
Grade；The calculation formula of intermediate parameters A, B, C, D, E and F is
3. a kind of control method for improving double-fed fan motor interconnected electric power system false voltage as described in claim 1, feature
It is, reaches maximum false voltage U in Power control range in step S103sf.maxRequired double-fed fan motor unit is idle function
Rate controls reference value Qsf.mvCalculation formula be
In formula:
Middle coefficient Yrc1、Yrc2、Irc、Ypf1、Ypf2、IpfRespectively
Irc=XmIrmax/Zs
Wherein Rs、XsStator winding resistance and equivalent reactance are respectively indicated,XmFor excitation reactance；IrmaxFor rotor
Electric current maximum permissible value；X'g=(1- α) Xl+Xg+XTg, X'd=α Xl+XTd, wherein XTgAnd XTdIt respectively connects power transmission line and waits
Transformer reactance and the double-fed fan motor unit voltage boosting transforming for being worth power grid are anti-；UgFor equivalent grid voltage amplitude, XgFor equivalent power grid etc.
Imitate reactance；XlFor the power transmission line overall length reactance of double-fed fan motor unit to equivalent power grid；All equal reduction of impedance are to same voltage etc.
Grade.
4. a kind of control method for improving double-fed fan motor interconnected electric power system false voltage as described in claim 1, feature
It is, accessible maximum false voltage U in double-fed fan motor unit Power control rangesf.maxCalculation formula be
In formula,
Middle coefficient Yrc1、Yrc2、Irc、Ypf1、Ypf2、IpfRespectively
Irc=XmIrmax/Zs
Wherein Rs、XsStator winding resistance and equivalent reactance are respectively indicated,XmFor excitation reactance；IrmaxFor rotor
Electric current maximum permissible value；X'g=(1- α) Xl+Xg+XTg, X'd=α Xl+XTd, wherein XTgAnd XTdIt respectively connects power transmission line and waits
Transformer reactance and the double-fed fan motor unit voltage boosting transforming for being worth power grid are anti-；UgFor equivalent grid voltage amplitude, XgFor equivalent power grid etc.
Imitate reactance；XlFor the power transmission line overall length reactance of double-fed fan motor unit to equivalent power grid；All equal reduction of impedance are to same voltage etc.
Grade；The calculation formula of intermediate parameters A, B, C, D, E and F is
5. a kind of control system for improving double-fed fan motor interconnected electric power system false voltage, which is characterized in that the control system
Include:
Measuring unit, set end voltage amplitude and phase and active and reactive power for real-time measurement double-fed fan motor unit；
First computing unit is calculated for the electrical quantity based on electrical network parameter, unit parameter and double-fed fan motor unit instant of failure
The line length of short dot to double-fed fan motor unit accounts for the ratio α and transition resistance R of total track lengthf；
Second computing unit calculates short dot to double-fed fan motor unit for the electrical quantity based on double-fed fan motor unit instant of failure
Line length account for the ratio α and transition resistance R of total track lengthf, it is calculated as reaching in Power control range maximum false voltage
Usf.maxRequired double-fed fan motor unit active power controller reference value Psf.mv；
Third computing unit calculates short dot to double-fed fan motor unit for the electrical quantity based on double-fed fan motor unit instant of failure
Line length account for the ratio α and transition resistance R of total track lengthf, it is calculated as reaching in Power control range maximum false voltage
Usf.maxRequired double-fed fan motor unit Reactive Power Control reference value Qsf.mv；
Control unit is used for double-fed fan motor unit rotor-side converter exterior ring power reference value when failure occurs by steady-state value
It is switched to Psf.mvAnd Qsf.mv, to implement to control.
6. a kind of control system for improving double-fed fan motor interconnected electric power system false voltage as described in claim 5, special
Sign is that second computing unit is based on formula
Double-fed fan motor unit active power controller reference value needed for being calculated as reaching in Power control range maximum false voltage
Psf.mv；
In formula, middle coefficient Yrc1、Yrc2、Irc、Ypf1、Ypf2、IpfRespectively
Irc=XmIrmax/Zs
Wherein Rs、XsStator winding resistance and equivalent reactance are respectively indicated,XmFor excitation reactance；IrmaxFor rotor
Electric current maximum permissible value；X'g=(1- α) Xl+Xg+XTg, X'd=α Xl+XTd, wherein XTgAnd XTdIt respectively connects power transmission line and waits
Transformer reactance and the double-fed fan motor unit voltage boosting transforming for being worth power grid are anti-；UgFor equivalent grid voltage amplitude, XgFor equivalent power grid etc.
Imitate reactance；XlFor the power transmission line overall length reactance of double-fed fan motor unit to equivalent power grid；All equal reduction of impedance are to same voltage etc.
Grade；The calculation formula of intermediate parameters A, B, C, D, E and F is
7. a kind of control system for improving double-fed fan motor interconnected electric power system false voltage as described in claim 5, special
Sign is that the third computing unit is based on formula
Double-fed fan motor unit Reactive Power Control reference value needed for being calculated as reaching in Power control range maximum false voltage
Qsf.mv:
In formula:
Middle coefficient Yrc1、Yrc2、Irc、Ypf1、Ypf2、IpfRespectively
Irc=XmIrmax/Zs
Wherein Rs、XsStator winding resistance and equivalent reactance are respectively indicated,XmFor excitation reactance；IrmaxFor rotor
Electric current maximum permissible value；X'g=(1- α) Xl+Xg+XTg, X'd=α Xl+XTd, wherein XTgAnd XTdIt respectively connects power transmission line and waits
Transformer reactance and the double-fed fan motor unit voltage boosting transforming for being worth power grid are anti-；UgFor equivalent grid voltage amplitude, XgFor equivalent power grid etc.
Imitate reactance；XlFor the power transmission line overall length reactance of double-fed fan motor unit to equivalent power grid；All equal reduction of impedance are to same voltage etc.
Grade.
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| CN110148968A (en) * | 2019-07-05 | 2019-08-20 | 华北电力大学 | Photovoltaic DC grid-connected system fault recovery control method |
| CN110571859A (en) * | 2019-10-10 | 2019-12-13 | 重庆大学 | method for improving grid-connected operation capacity of double-fed wind turbine generator under power grid fault |
| CN111342489A (en) * | 2020-02-28 | 2020-06-26 | 重庆大学 | Grid fault voltage boosting method based on active power control of doubly-fed wind power plant |
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| CN108614189A (en) * | 2018-05-10 | 2018-10-02 | 国网重庆市电力公司电力科学研究院 | Send out line three phase short circuit fault direction determination process and directional element in double-fed fan motor field |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110148968A (en) * | 2019-07-05 | 2019-08-20 | 华北电力大学 | Photovoltaic DC grid-connected system fault recovery control method |
| CN110148968B (en) * | 2019-07-05 | 2021-02-12 | 华北电力大学 | Fault recovery control method for photovoltaic direct-current grid-connected system |
| CN110571859A (en) * | 2019-10-10 | 2019-12-13 | 重庆大学 | method for improving grid-connected operation capacity of double-fed wind turbine generator under power grid fault |
| CN110571859B (en) * | 2019-10-10 | 2021-02-26 | 重庆大学 | Method for improving grid-connected operation capacity of double-fed wind turbine generator under power grid fault |
| CN111342489A (en) * | 2020-02-28 | 2020-06-26 | 重庆大学 | Grid fault voltage boosting method based on active power control of doubly-fed wind power plant |
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