CN105305438B - New energy power station model verification method based on impedance and controlled AC voltage source - Google Patents
New energy power station model verification method based on impedance and controlled AC voltage source Download PDFInfo
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Abstract
The present invention provides the new energy power station model verification method based on impedance and controlled AC voltage source, including：Obtain measurement voltage, active power and the reactive power amplitude of wind power plant and photovoltaic electric station grid connection point；Set controlled AC voltage source amplitude and phase angle as fixed value, the resistance and reactance value or set the resistance of impedance and reactance value be voltage magnitude and angle values that fixed value calculates controlled AC voltage source, the acquisition using impedance and controlled AC the voltage source realization for injecting measured data to the exact value of external electrical network of impedance are calculated according to the voltage of the wind power plant of actual measurement/photovoltaic electric station grid connection point and active/reactive power amplitude；Active/the reactive power value for obtaining grid entry point is calculated by Digital Simulation, and compared with measured data, wind power plant and photovoltaic plant model are accurate if consistent, otherwise indicate that there are errors；And as actual measurement equivalent point is further shunk, this method can be used for positioning the specific location of wind power plant and photovoltaic plant model error source.
Description
Technical field
The present invention relates to a kind of verification methods, and in particular to the new energy power station based on impedance and controlled AC voltage source
Model verification method.
Background technology
As the new energy such as wind-powered electricity generation, photovoltaic generation access the continuous increase of power grid scale, the influence to power grid obtains
Extensive concern and research.The accuracy of new energy power station model is itself and the interactional key factor of power grid of research, however still
It is not solved very well.Currently, to obtain the model parameter of accurate generation of electricity by new energy unit and station, people generally use and set
The method of standby on-the-spot test, and test of many times is needed, then trial curve is fitted by constantly adjusting model parameter.Equipment
Test can influence the normal operation of new energy power station, bring economic loss, and such modeling verification method is often served only for managing
The one machine infinity bus system thought, in the interconnected electric power system for actual complex, long, block mold complexity that there are modeling periods
The model parameter uncertain factors of error-prone, various elements is more, can not rule out the error that actual electric network models is influenced, be difficult to it is fixed
It is the problems such as source of bit model error, ineffective.
In recent years, with the fast development of measuring technique, the especially continuous popularization and application of Wide Area Measurement System (WAMS),
Provide target synchronized phasor when with unification so that the point being distributed in large regional grid everywhere can be under same time scale
It is compared, new approaches is provided for Validation of Simulation Models research.How using valuable WAMS system measurement datas, establish new
The non-working port characteristic model of energy power station access system excludes the influence to power network modeling error, realizes mutual to actual complex
Join the quick simulation modeling verification of electric system, and the hybrid dynamic simulation method injected based on WAMS system measured datas, by
Step reduces the range of modeling error source positioning inside new energy power station, and then completes the mould of new energy power station and its internal element
Type is verified, and is needed to be studied.
According to document and patent finding, the method for the invention and application there is no both at home and abroad, more relevant is clear
Hua Da Wu Wenchuan, Zhang Baiming be equal to application in 2009 " checking electric power system model method based on hybrid dynamic simulation and
System " patent of invention, however the patent based on phasor measurement unit (PMU) measured data come equivalent external electrical network, but practical work
Wind power plant and photovoltaic plant access point voltage class (35kV or 110kV) be not general high in journey, configures the few of PMU, therefore should
Patent is less well-suited to verification wind power plant and photovoltaic plant model.
Invention content
To fill up above-mentioned blank, the present invention provides the new energy power station model based on impedance and controlled AC voltage source and tests
Card method carrys out accurate equivalent external electrical network by measured data, effectively avoids the error modeled to external network system；And it adopts
It is greatly reduced and is obtained compared to using voltage phase angle with voltage magnitude, active power amplitude and reactive power amplitude measured data
Take difficulty；While this method meets data synchronization, suitable for not installing the scene of phasor measuring set (PMU).
In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical scheme that：
New energy power station model verification method based on impedance and controlled AC voltage source, the method includes following steps
Suddenly：
Step 1：Voltage, active power and the reactive power amplitude of wind power plant/photovoltaic electric station grid connection point are measured, and to measuring
Data are handled；
Step 2：Establish the model of impedance and controlled AC voltage source；
Step 3：Set controlled AC voltage source amplitude and phase angle as fixed value, according to wind power plant/photovoltaic electric of actual measurement
Grid entry point of standing voltage, active power and reactive power amplitude calculate the resistance and reactance value of impedance, and result of calculation is inputted and is become
The model of impedor；Or set impedance resistance and reactance value as fixed value, according to wind power plant/photovoltaic plant of actual measurement
Voltage, active power and the reactive power amplitude of grid entry point calculate the voltage magnitude and angle values of controlled AC voltage source, will count
Calculate the model of result input controlled AC voltage source element；
Step 4：Wind power plant/photovoltaic plant access system model is established, wherein grid entry point is connected with outer portion with impedance
Controlled AC voltage source replaces；
Step 5：Scene disturbance is simulated in power system digital simulation analysis software, obtains wind power plant/light under the disturbance
The active power and reactive power value of overhead utility grid entry point；
Step 6：The wind power plant/photovoltaic electric station grid connection point active power and reactive power value are subtracted to the wattful power of actual measurement
Rate and reactive power value obtain departure；
Step 7：The size of the departure is differentiated, if its absolute value is less than actual measurement active power and reactive power value
5%, then wind power plant/photovoltaic plant model that judgement is established in power system digital simulation software is accurate；If departure
Absolute value is more than the 5% of actual measurement active power and reactive power value, then judgement is established in power system digital simulation software
Wind power plant/photovoltaic plant model is inaccurate；
Step 8：If step 7 judge result for inaccuracy when, measure situation according to live practical, it is equivalent to shrink external electrical network
Point replaces the electric network model other than new equivalent point with impedance and controlled AC voltage source, and repeats step 5-7 and be accurately positioned
Wind power plant/photovoltaic plant model error source.
Preferably, wind power plant grid entry point is wind power plant booster stations high-voltage side bus or node in the step 1；
If photovoltaic plant has booster stations, the photovoltaic electric station grid connection point to indicate booster stations high-voltage side bus or node；If light
Overhead utility indicates the output aggregation point of photovoltaic plant without booster stations, the grid entry point.
Preferably, the step 1 handles measurement data, including filtering, the interval of measurement data and system emulation
Step-length unification.
Preferably, in the step 2, common electric system simulation analysis software includes impedance and controlled AC electricity
Potential source model；Wherein, the simulation analysis software include DIgSILENT PowerFactory, PSS/E, PSASP, BPA and
MATLAB。
Preferably, in the step 3, according to wind power plant/photovoltaic electric station grid connection point measurement voltage, active power and idle work(
Rate amplitude calculates the setting value of impedance and controlled AC voltage source, can pass through the amplitude and phase angle of setting controlled AC voltage source
For fixed value, the resistance and reactance setting value of impedance are calculated；By set impedance resistance and reactance value as fixed value, meter
Calculate the voltage and phase angle setting value of controlled AC voltage source；
The parameter of the grid entry point measurement voltage, active power and reactive power value and impedance, controlled AC voltage source
Between mathematical relationship expression formula it is as follows：
Wherein,For grid entry point voltage magnitude, R is the resistance value of variable-impedance component, and X is the reactance value of variable-impedance component,For the voltage magnitude of controlled AC voltage source, XWFFor wind power plant and its equivalent impedance of step-up transformer, P is that grid entry point is active
Power magnitude, Q are grid entry point reactive power amplitude,For grid entry point current amplitude, θ is the angle values of grid entry point voltage.
Preferably, in the step 4, wind power plant/photovoltaic plant access system model includes wind power plant/photovoltaic plant, liter
Pressure transformer, circuit, step-down transformer and load.
Preferably, in the step 5, power system digital simulation analysis software includes DIgSILENT
PowerFactory, PSS/E, PSASP, BPA and MATLAB.
Preferably, in the step 5, scene disturbance includes short trouble；When system emulation, to the initial shape of trend distribution
State is adjusted so that consistent with field measurement operating mode pre-fault status.
Compared with prior art, the advantageous effect that the present invention reaches is：
1) method disclosed in carrys out accurate equivalent external electrical network by measured data, effectively avoids modeling external network system
Error；And using voltage magnitude, active power amplitude and reactive power amplitude measured data, difficulty is obtained than voltage phase
Angle is small；While meeting data synchronization, it is equally applicable to that the scene of phasor measuring set (PMU) is not installed.
2) by controlling impedance and controlled AC voltage source come equivalent external electrical network, clear physics conception is easy to be easy-to-use,
It grasps and uses convenient for the power industry engineer of different knowledge hierarchies and researcher.
3) have versatility, be easy expanded application to the Accuracy Verification problem of each component models of electric system, before
Scape is wide.
Description of the drawings
Fig. 1 is wind power plant access system structural schematic diagram provided by the invention；
Fig. 2 is that provided by the invention accessed using the wind power plant of impedance and controlled AC voltage source equivalence external electrical network is
System structural schematic diagram；
Fig. 3 is the model schematic of variable-impedance component provided by the invention.
Fig. 4 is the model schematic of controlled AC voltage source element in the embodiment of the present invention；
Fig. 5 is wind farm grid-connected wattful power of the wind farm grid-connected active power surveyed in the embodiment of the present invention and emulation
The comparison diagram of rate amplitude；
Fig. 6 is the wind farm grid-connected reactive power surveyed in the embodiment of the present invention and the wind farm grid-connected idle work(of point of emulation
The comparison diagram of rate amplitude.
Specific implementation mode
Below with reference to attached drawing, the specific implementation mode of the present invention is described in further detail.
A kind of new energy power station model verification method, the described method comprises the following steps：
Step 1：Voltage, active power and the reactive power amplitude of wind power plant/photovoltaic electric station grid connection point are measured, and to measuring
Data are handled；Wind power plant grid entry point is wind power plant booster stations high-voltage side bus or node in step 1；
If photovoltaic plant has booster stations, the photovoltaic electric station grid connection point to indicate booster stations high-voltage side bus or node；If light
Overhead utility indicates the output aggregation point of photovoltaic plant without booster stations, the grid entry point.
Measurement data is handled, including filtering, the interval of measurement data and system emulation step-length unification.
Step 2：Establish the model of impedance and controlled AC voltage source；Common electric system simulation analysis software is wrapped
Containing impedance and controlled AC voltage source model；Wherein, the simulation analysis software include DIgSILENT PowerFactory,
PSS/E, PSASP, BPA and MATLAB.
Step 3：Set controlled AC voltage source amplitude and phase angle as fixed value, according to wind power plant/photovoltaic electric of actual measurement
Grid entry point of standing voltage, active power and reactive power amplitude calculate the resistance and reactance value of impedance, and result of calculation is inputted and is become
The model of impedor；As shown in figure 3, set impedance resistance and reactance value as fixed value, according to the wind-powered electricity generation of actual measurement
The voltage of field/photovoltaic electric station grid connection point, active power and reactive power amplitude calculate controlled AC voltage source voltage magnitude and
Result of calculation is inputted the model of controlled AC voltage source element by angle values；As shown in Figure 4.
In step 3, calculated according to wind power plant/photovoltaic electric station grid connection point measurement voltage, active power and reactive power amplitude
The setting value of impedance and controlled AC voltage source, can by set controlled AC voltage source amplitude and phase angle as fixed value,
Calculate the resistance and reactance setting value of impedance；By set impedance resistance and reactance value as fixed value, calculate controlled friendship
The voltage and phase angle setting value of galvanic electricity potential source.
Grid entry point measurement voltage, active power and reactive power value and impedance, controlled AC voltage source parameter between
Mathematical relationship expression formula it is as follows：
Wherein,Grid entry point voltage magnitude, R：The resistance value of variable-impedance component, X：The reactance value of variable-impedance component,
The voltage magnitude of controlled AC voltage source, XWF：The equivalent impedance of wind power plant and its step-up transformer, P：Grid entry point active power width
Value, Q：Grid entry point reactive power amplitude,Grid entry point current amplitude, θ：The angle values of grid entry point voltage.
In conjunction with shown in Fig. 1 and Fig. 2, step 4：Wind power plant/photovoltaic plant access system model is established, wherein other than grid entry point
Part is replaced with impedance series connection controlled AC voltage source；Wind power plant/photovoltaic plant access system model includes wind power plant/photovoltaic
Power station, step-up transformer, circuit, step-down transformer and load.
Step 5：Scene disturbance is simulated in power system digital simulation analysis software, obtains wind power plant/light under the disturbance
The active power and reactive power value of overhead utility grid entry point；
In step 5, power system digital simulation analysis software include DIgSILENT PowerFactory, PSS/E,
PSASP, BPA and MATLAB.
Scene disturbance includes short trouble；When system emulation, the original state of trend distribution is adjusted so that with it is existing
Field actual measurement operating mode pre-fault status is consistent.
Step 6：The wind power plant/photovoltaic electric station grid connection point active power and reactive power value are subtracted to the wattful power of actual measurement
Rate and reactive power value obtain departure；
Step 7：The size of the departure is differentiated, if its absolute value is less than actual measurement active power and reactive power value
5%, then wind power plant/photovoltaic plant model that judgement is established in power system digital simulation software is accurate；If departure
Absolute value is more than the 5% of actual measurement active power and reactive power value, then judgement is established in power system digital simulation software
Wind power plant/photovoltaic plant model is inaccurate；
Step 8：If step 7 judge result for inaccuracy when, measure situation according to live practical, it is equivalent to shrink external electrical network
Point replaces the electric network model other than new equivalent point with impedance and controlled AC voltage source, and repeats step 5-7 and be accurately positioned
Wind power plant/photovoltaic plant model error source.
Embodiment：
The wind farm grid-connected point of simulation data may be implemented using impedance and controlled AC voltage source equivalence external electrical network
Active power, reactive power are consistent with measured value, as shown in Figure 5 and Figure 6；To which the reality for accurately reflecting external electrical network is dynamic
State feature.Demonstrate the validity and practicability of model verification method proposed by the present invention.
The specific embodiment of the invention can equally be well applied to photovoltaic plant and other electric power by taking wind power plant access system as an example
The verification of system element (such as synchronous generator) access system model.Model verification method impedance proposed by the present invention and by
Alternating-current voltage source equivalence external electrical network is controlled, clear physics conception is easy to operate, convenient for real in various power system simulation softwares
It is existing, and the voltage magnitude surveyed and active power, reactive power amplitude data are only needed, voltage phase angle data are not needed, are compared
Has the model verification method based on the injection of phasor measurement unit (PMU) measured data that patent proposes, to field measurement apparatus
It is required that it is relatively low, it only need to substantially ensure the markers consistency of measurement data, be applicable not only to the occasion of installation PMU, be also suitable
In the occasion for not installing PMU equipment.
Finally it should be noted that：The above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, institute
The those of ordinary skill in category field with reference to above-described embodiment still can to the present invention specific implementation mode modify or
Equivalent replacement, these are applying for this pending hair without departing from any modification of spirit and scope of the invention or equivalent replacement
Within bright claims.
Claims (8)
1. the new energy power station model verification method based on impedance and controlled AC voltage source, which is characterized in that the method
Include the following steps：
Step 1：Voltage, active power and the reactive power amplitude of wind power plant/photovoltaic electric station grid connection point are measured, and to measurement data
It is handled；
Step 2：Establish the model of impedance and controlled AC voltage source；
Step 3：Set controlled AC voltage source amplitude and phase angle as fixed value, simultaneously according to wind power plant/photovoltaic plant of actual measurement
Site voltage, active power and reactive power amplitude calculate the resistance and reactance value of impedance, and result of calculation is inputted impedance
The model of element；Or set impedance resistance and reactance value as fixed value, according to wind power plant/photovoltaic electric station grid connection of actual measurement
Voltage, active power and the reactive power amplitude of point calculate the voltage magnitude and angle values of controlled AC voltage source, are tied calculating
Fruit inputs the model of controlled AC voltage source element；
Step 4：Wind power plant/photovoltaic plant access system model is established, wherein grid entry point is connected with outer portion with impedance controlled
Alternating-current voltage source replaces；
Step 5：Scene disturbance is simulated in power system digital simulation analysis software, obtains wind power plant/photovoltaic electric under the disturbance
The active power and reactive power value for grid entry point of standing；
Step 6：By the wind power plant/photovoltaic electric station grid connection point active power and reactive power value subtract actual measurement active power and
Reactive power value obtains departure；
Step 7：Differentiate the size of the departure, if its absolute value is less than the 5% of actual measurement active power and reactive power value,
Judge that the wind power plant/photovoltaic plant model established in power system digital simulation software is accurate；If departure absolute value
More than actual measurement active power and reactive power value 5%, then judgement established in power system digital simulation software wind power plant/
Photovoltaic plant model is inaccurate；
Step 8：If step 7 judge result for inaccuracy when, measure situation according to live practical, shrink external electrical network equivalent point,
The electric network model other than new equivalent point is replaced with impedance and controlled AC voltage source, and repeats step 5-7 and wind is accurately positioned
Electric field/photovoltaic plant model error source.
2. the method as described in claim 1, which is characterized in that wind power plant grid entry point is wind power plant booster stations in the step 1
High-voltage side bus or node；
If photovoltaic plant has booster stations, the photovoltaic electric station grid connection point to indicate booster stations high-voltage side bus or node；If photovoltaic electric
It stands no booster stations, which indicates the output aggregation point of photovoltaic plant.
3. the method as described in claim 1, which is characterized in that the step 1 handles measurement data, including filtering,
The interval of measurement data and system emulation step-length unification.
4. the method as described in claim 1, which is characterized in that in the step 2, common electric system simulation analysis software
Include impedance and controlled AC voltage source model；Wherein, the simulation analysis software includes DIgSILENT
PowerFactory, PSS/E, PSASP, BPA and MATLAB.
5. the method as described in claim 1, which is characterized in that in the step 3, according to wind power plant/photovoltaic electric station grid connection point
Measurement voltage, active power and reactive power amplitude calculate the setting value of impedance and controlled AC voltage source, by setting by
The amplitude and phase angle for controlling alternating-current voltage source are fixed value, calculate the resistance and reactance setting value of impedance；By setting impedance
Resistance and reactance value be fixed value, calculate controlled AC voltage source voltage and phase angle setting value；
The grid entry point measurement voltage, active power and reactive power value and impedance, controlled AC voltage source parameter between
Mathematical relationship expression formula it is as follows：
Wherein,For grid entry point voltage magnitude, R is the resistance value of variable-impedance component, and X is the reactance value of variable-impedance component,For by
Control the voltage magnitude of alternating-current voltage source, XWFFor wind power plant and its equivalent impedance of step-up transformer, P is grid entry point active power width
Value, Q are grid entry point reactive power amplitude,For grid entry point current amplitude, θ is the angle values of grid entry point voltage.
6. the method as described in claim 1, which is characterized in that in the step 4, wind power plant/photovoltaic plant access system mould
Type includes wind power plant/photovoltaic plant, step-up transformer, circuit, step-down transformer and load.
7. the method as described in claim 1, which is characterized in that in the step 5, power system digital simulation analysis software package
Include DIgSILENT PowerFactory, PSS/E, PSASP, BPA and MATLAB.
8. the method as described in claim 1, which is characterized in that in the step 5, scene disturbance includes short trouble；System
When emulation, the original state of trend distribution is adjusted so that consistent with field measurement operating mode pre-fault status.
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| CN105977985B (en) * | 2016-06-29 | 2018-09-11 | 上海交通大学 | A kind of micro-capacitance sensor flow controller |
| CN107069808A (en) * | 2017-03-28 | 2017-08-18 | 中国电力科学研究院 | A kind of new energy power station model error localization method and device |
| CN108964122B (en) * | 2018-07-16 | 2021-01-15 | 中国电力科学研究院有限公司 | Verification method and device for frequency response characteristic of wind turbine generator electrical model |
| CN109412204B (en) * | 2018-11-09 | 2020-10-30 | 国家电网公司东北分部 | Wind power plant simulation modeling method and device for subsynchronous oscillation simulation analysis |
| CN112072692A (en) * | 2019-06-11 | 2020-12-11 | 中国电力科学研究院有限公司 | Impedance equivalence method and device for new energy power generation station |
| CN113075470B (en) * | 2021-02-24 | 2023-03-14 | 中国电力科学研究院有限公司 | Method and system for testing system strength adaptability of new energy model |
| CN113176445B (en) * | 2021-03-26 | 2022-06-14 | 南方电网科学研究院有限责任公司 | Method and system for scanning secondary and super-synchronous frequency band complex impedance characteristics of power equipment |
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