CN109120013A - A kind of method and device for grid adaptability detection device injection disturbance quantity - Google Patents
A kind of method and device for grid adaptability detection device injection disturbance quantity Download PDFInfo
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Abstract
The embodiment of the present application shows a kind of method and device for grid adaptability detection device injection disturbance quantity.Object intrusion amount is decomposed into three-phase symmetrical sinusoidal ac signal by the technical solution shown in the embodiment of the present application, voltage magnitude is calculated and frequency is given, actual measurement three-phase voltage information is decomposed into three-phase symmetrical sinusoidal ac signal, voltage magnitude and frequency feedback signal is calculated, respectively as the input of disturbance amount controller, it realizes each disturbance quantity closed loop control, improves the output accuracy of detection platform, to improve by the accuracy of detection device adaptive testing.
Description
Technical field
It is the present invention relates to electrical equipment, in particular to a kind of to inject disturbance quantity for grid adaptability detection device
Method and device.
Background technique
Increasingly depleted and power load in face of natural resources is continuously increased, and to greatly develop clean energy resource be the current world
Society's reply energy shortages, the important development direction for ensureing energy supply.
1.64 hundred million kilowatts and 1.3 are had reached respectively by the end of the year 2017, China's photovoltaic and installed capacity of wind-driven power according to statistics
Hundred million kilowatts.New energy has become the second largest power supply of many provincial power networks, or even in part provincial power network new energy installation accounting
Already exceed 40%, it may be said that extensive, high proportion new energy will become the important feature of a new generation of China electric system.
Since the unstability and fluctuation of solar energy and wind energy are larger, cause wind-powered electricity generation and photovoltaic unit active power output random
Fluctuation.This fluctuation is that a kind of disturb is possible to will cause low-frequency oscillation for the conventional thermal power unit on route, furthermore
It is this it is active fluctuation cause along reactive loss variation, cause system voltage to fluctuate, and be difficult to control.
On a large scale, high proportion new energy accesses power grid, declines the regulating power of power grid and Ability of Resisting Disturbance constantly, is electricity
The stabilization risk of net is continuously increased.In face of being continuously increased to the safe and reliable operation of power grid for wind-powered electricity generation and photovoltaic set grid-connection capacity
It is proposed new challenge, how to recognize the grid-connected characteristic of operation of photovoltaic and Wind turbines is that current operation power traffic department faces
Eager problem.
Protection threshold set by the power electronic equipment of photovoltaic and Wind turbines is sensitiveer, and in some cases,
When disturbing in face of power grid, if there is large capacity photovoltaic and Wind turbines off-grid, system oscillation accident may cause, to power grid
Safe and reliable operation will cause it is unfavorable.
Therefore, it is detected by grid adaptability of the adaptive detection device to photovoltaic and Wind turbines；The prior art
The detection device shown can not really react the grid adaptability of photovoltaic and Wind turbines.
Summary of the invention
Goal of the invention of the invention be to provide a kind of method for grid adaptability detection device injection disturbance quantity and
Device, to solve the technology that the detection device shown in the prior art can not really react the grid adaptability of photovoltaic and Wind turbines
Problem.
The embodiment of the present application first aspect shows a kind of method for grid adaptability detection device injection disturbance quantity, institute
The method of stating includes:
It gets parms, determines object intrusion mode；
Given parameters are inputted according to object intrusion mode, three-phase voltage amplitude and frequency Setting signal is calculated；
Three-phase output voltage is acquired, amplitude, the frequency of three-phase voltage are calculated, generates feedback signal；
By Setting signal, feedback signal, input disturbance amount controller adjusts to obtain output voltage instruction signal；
The voltage command signal is compared with the triangular carrier, output obtains pwm control signal, according to described
Pwm signal control IGBT is opened and is turned off.
It is selectable:
There are three types of perturbation modes:
Mode 1 is voltage swell, temporarily drop, fluctuation, flickering and frequency fluctuation；
Mode 2 is imbalance of three-phase voltage；
Mode 3 is harmonic injection mode.
The mode 1 is used to indicate input voltage amplitude and frequency given parameters, and other parameters input is invalid；
The mode 2 is used to indicate input imbalance of three-phase voltage given parameters, and other parameters input is invalid；
The mode 3 is used to indicate input harmonics order and corresponding harmonic content parameter, and other parameters input is invalid.
It is selectable, when the mode be mode 2 when, it is described calculate three-phase voltage amplitude the step of include:
Park coordinate transform is carried out to three-phase output voltage and obtains 2 frequency multiplication alternating voltage of positive sequence DC voltage component and negative phase-sequence
Component；
Component of voltage after coordinate transform is filtered by 2 frequency multiplication notch filters, obtains positive sequence DC voltage point
Amount；
Positive sequence DC voltage component is carried out anti-Park to convert to obtain three-phase positive sequence alternating current voltage component；
Three-phase positive sequence voltage component, which is subtracted, with three-phase output voltage obtains three-phase negative/positive component of voltage；
Calculate separately the amplitude of positive sequence voltage and negative sequence voltage.
It is selectable, the input harmonics order and corresponding harmonic content parameter specifically:
Input harmonics order and corresponding harmonic wave account for fundamental wave percentage parameter.
Selectable, the voltage instruction information includes: amplitude in conjunction with frequency.
The embodiment of the present application second aspect shows a kind of device for grid adaptability detection device injection disturbance quantity, institute
Stating device includes:
Acquiring unit determines object intrusion mode for getting parms；
Three-phase voltage amplitude and frequency is calculated for inputting given parameters according to object intrusion mode in computing unit
Setting signal；
Generation unit calculates amplitude, the frequency of three-phase voltage, generates feedback signal for acquiring three-phase output voltage；
Input unit is used for Setting signal, feedback signal, and input disturbance amount controller adjusts to obtain output voltage instruction
Signal；
Control unit, for the voltage command signal to be compared with the triangular carrier, output obtains PWM control
Signal is opened and is turned off according to pwm signal control IGBT.
From the above technical scheme, the embodiment of the present application shows a kind of for the injection disturbance of grid adaptability detection device
The method and device of amount determines object intrusion mode the described method includes: get parms；It is given according to the input of object intrusion mode
Three-phase voltage amplitude and frequency Setting signal is calculated in parameter；Acquire three-phase output voltage, calculate three-phase voltage amplitude,
Frequency generates feedback signal；By Setting signal, feedback signal, input disturbance amount controller adjusts to obtain output voltage instruction letter
Number；The voltage command signal is compared with the triangular carrier, output obtains pwm control signal, believes according to the PWM
Number control IGBT open and turn off.There are three types of perturbation modes: mode 1 is voltage swell, temporarily drop, fluctuation, flickering and frequency fluctuation；
Mode 2 is imbalance of three-phase voltage；Mode 3 is harmonic injection mode.The mode 1 is used to indicate input voltage amplitude and frequency
Given parameters, other parameters input are invalid；The mode 2 is used to indicate input imbalance of three-phase voltage given parameters, other ginsengs
Number input is invalid；The mode 3 is used to indicate input harmonics order and corresponding harmonic content parameter, and other parameters input is invalid.
The embodiment of the present application shows a kind of method and device for grid adaptability detection device injection disturbance quantity.The embodiment of the present application
Object intrusion amount is decomposed into three-phase symmetrical sinusoidal ac signal by the technical solution shown, be calculated voltage magnitude and frequency to
Fixed (feedback signal)；Actual measurement three-phase voltage information is decomposed into three-phase symmetrical sinusoidal ac signal, and voltage magnitude and frequency is calculated
Rate feedback signal realizes each disturbance quantity closed loop control, improves detection platform respectively as the input of disturbance amount controller
Output accuracy, thus improve by the accuracy of detection device adaptive testing.
Detailed description of the invention
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is that a kind of method of platform injection disturbance quantity that disturbance quantity is injected for grid adaptability detection device controls stream
Cheng Tu；
Fig. 2 is the control block diagram of voltage fluctuation and flicker in mode of the embodiment of the present invention 1；
Fig. 3 is that the positive-negative sequence that mode 2 uses in the embodiment of the present invention separates control block diagram；
Fig. 4 is the control block diagram of mode 2 in the embodiment of the present invention；
Fig. 5 is the control block diagram of mode 3 in the embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Whole description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The embodiment of the present application first aspect shows a kind of method for grid adaptability detection device injection disturbance quantity, institute
The method of stating includes:
It gets parms, determines object intrusion mode；
Given parameters are inputted according to object intrusion mode, three-phase voltage amplitude and frequency Setting signal is calculated；
Three-phase output voltage is acquired, amplitude, the frequency of three-phase voltage are calculated, generates feedback signal；
By Setting signal, feedback signal, input disturbance amount controller adjusts to obtain output voltage instruction signal；
The voltage command signal is compared with the triangular carrier, output obtains pwm control signal, according to described
Pwm signal control IGBT is opened and is turned off.
It is selectable:
There are three types of perturbation modes:
Mode 1 is voltage swell, temporarily drop, fluctuation, flickering and frequency fluctuation；
Mode 2 is imbalance of three-phase voltage；
Mode 3 is harmonic injection mode.
The mode 1 is used to indicate input voltage amplitude and frequency given parameters, and other parameters input is invalid；
The mode 2 is used to indicate input imbalance of three-phase voltage given parameters, and other parameters input is invalid；
The mode 3 is used to indicate input harmonics order and corresponding harmonic content parameter, and other parameters input is invalid.
It is selectable, when the mode be mode 2 when, it is described calculate three-phase voltage amplitude the step of include:
Park coordinate transform is carried out to three-phase output voltage and obtains 2 frequency multiplication alternating voltage of positive sequence DC voltage component and negative phase-sequence
Component；
Component of voltage after coordinate transform is filtered by 2 frequency multiplication notch filters, obtains positive sequence DC voltage point
Amount；
Positive sequence DC voltage component is carried out anti-Park to convert to obtain three-phase positive sequence alternating current voltage component；
Three-phase positive sequence voltage component, which is subtracted, with three-phase output voltage obtains three-phase negative/positive component of voltage；
Calculate separately the amplitude of positive sequence voltage and negative sequence voltage.
It is selectable, the input harmonics order and corresponding harmonic content parameter specifically:
Input harmonics order and corresponding harmonic wave account for fundamental wave percentage parameter.
Selectable, the voltage instruction information includes: amplitude in conjunction with frequency.
The embodiment of the present application second aspect shows a kind of device for grid adaptability detection device injection disturbance quantity, institute
Stating device includes:
Acquiring unit determines object intrusion mode for getting parms；
Three-phase voltage amplitude and frequency is calculated for inputting given parameters according to object intrusion mode in computing unit
Setting signal；
Generation unit calculates amplitude, the frequency of three-phase voltage, generates feedback signal for acquiring three-phase output voltage；
Input unit is used for Setting signal, feedback signal, and input disturbance amount controller adjusts to obtain output voltage instruction
Signal；
Control unit, for the voltage command signal to be compared with the triangular carrier, output obtains PWM control
Signal is opened and is turned off according to pwm signal control IGBT.
Specifically, Fig. 1 is provided in an embodiment of the present invention a kind of for grid adaptability detection device injection disturbance quantity
The specific implementation step of method, according to Fig. 1, the method that the application injects disturbance quantity includes:
Input detection platform perturbation mode selection parameter；
It obtains detection platform perturbation mode and inputs parameter, determine object intrusion mode, that is, whether judge input disturbance mode
For mode 1 or mode 2 or mode 3；
Input parameter.If mode 1, then input voltage amplitude and frequency given parameters；
If mode 2 then inputs non-equilibrium among three phase voltages parameter, the positive sequence of three-phase voltage signal is decomposed and is calculated
It is given with negative sequence voltage amplitude；
If mode 3, then input harmonics order and corresponding harmonic content parameter, and it is given to calculate each order voltage magnitude；
The three-phase output voltage of acquisition testing platform, and the information such as the amplitude of three-phase voltage, frequency are calculated as feedback letter
Number；
The different Setting signal and feedback signal are inputted into PI (proportional integral) controller respectively
Adjusting obtains output voltage command information, and synthesis obtains output voltage instruction；
Using output three-phase voltage command signal as modulated signal compared with triangular carrier, output obtains PWM (Pulse
Width Modulation, pulse width modulation) control signal, detection device is according to pwm signal control IGBT
(Insulated Gate Bipolar Transisto, bipolar junction transistor) is opened and is turned off, to realize output voltage pair
Determine following for signal.
As one of the present embodiment mode, voltage fluctuation and flicker is specific when the following detailed description of selection mode 1
Implementation process:
The first step, input detection platform perturbation mode selection parameter are 1；
Second step inputs parameter, voltage magnitude parameter A0, A1 and ω1, then object intrusion amount voltage magnitude is given as
Three-phase voltage amplitude U is calculated in third step, acquisition testing platform three-phase output voltagerAs feedback；
Object intrusion amount voltage magnitude is given and voltage magnitude feedback quantity is input to PI controller, such as Fig. 2 institute by the 4th step
Show, output obtains control information Mr, further the three-phase voltage that obtained control information synthesizes to obtain input detection platform is referred to
Order is
5th step, using output three-phase voltage command as modulated signal compared with triangular carrier, output obtains PWM control letter
Number, detection device is opened and is turned off according to pwm signal control IGBT, to realize that output voltage is followed to signal is determined.
As second of mode in the present embodiment, specific implementation process when the following detailed description of selection mode 2:
The first step, input detection platform perturbation mode selection parameter are 2；
Second step inputs parameter, non-equilibrium among three phase voltages εU, it is given to calculate positive-negative sequence voltage magnitude.Assuming that due to A phase
Voltage raising leads to Voltage unbalance, then A phase voltage amplitude is calculated as
Wherein U*Three-phase voltage amplitude is given when for normal output voltage；
Fig. 3 is that positive-negative sequence provided in an embodiment of the present invention separates control block diagram, as shown in figure 3, carrying out to three-phase voltage
Park coordinate transform obtains 2 frequency multiplication alternating current voltage component of positive sequence DC voltage component and negative phase-sequence, by the voltage after coordinate transform point
Amount is filtered by 2 frequency multiplication notch filters, obtains positive sequence DC voltage component, positive sequence DC voltage component is carried out anti-
Park converts to obtain three-phase positive sequence alternating current voltage component,
Three-phase positive sequence voltage component, which is subtracted, with three-phase voltage obtains three-phase negative/positive component of voltage.
Further, it is given to calculate separately positive sequence voltageIt is given with negative sequence voltage amplitude
Third step acquires three-phase output voltage, and calculates the positive and negative order components conduct of the three-phase output voltage of three-phase voltage
Feedback, as shown in figure 3, carrying out Park coordinate transform to three-phase output voltage obtains 2 frequency multiplication of positive sequence DC voltage component and negative phase-sequence
Component of voltage after coordinate transform is filtered by 2 frequency multiplication notch filters, obtains positive sequence direct current by alternating current voltage component
Component is pressed, positive sequence DC voltage component is subjected to anti-Park and converts to obtain three-phase positive sequence alternating current voltage component；Electricity is exported with three-phase
Pressure subtracts three-phase positive sequence voltage component and obtains three-phase negative/positive component of voltage；
Further, positive sequence voltage amplitude U is calculated separately+With negative sequence voltage amplitude U-。
4th step, by the amplitude of object intrusion amount positive sequence voltage and negative sequence voltage is given and positive sequence voltage and negative sequence voltage
Amplitude feedback quantity is input to PI controller, and wherein positive sequence controls respectively with negative sequence voltage components, as shown in Figure 4.PI controller is defeated
Control information M is obtained out+And M-, further obtained control information is synthesized to obtain the three-phase voltage command of input detection platform
For
5th step, using output three-phase voltage command as modulated signal compared with triangular carrier, output obtains PWM control letter
Number, detection device is opened and is turned off according to pwm signal control IGBT, to realize that output voltage is followed to signal is determined.
As the third mode in the present embodiment, specific implementation process when the following detailed description of selection mode 2:
The first step, input detection platform perturbation mode selection parameter are 3；
Second step, inputs parameter, and overtone order n and corresponding harmonic wave account for fundamental wave percentage HRUn；
Fundamental voltage amplitudeHarmonic voltage amplitude is given as
Third step measures detection platform three-phase output voltage, decomposes to obtain fundamental wave and nth harmonic electricity by Fourier transformation
Pressure amplitude value U1、UnIt is fed back as state；
Object intrusion amount voltage magnitude is given and voltage magnitude feedback quantity is input to PI controller, wherein base by the 4th step
Wave controls respectively with harmonic wave, as shown in Figure 5.PI controller exports to obtain control information M1And Mn, further obtained control is believed
Breath synthesizes the three-phase voltage command for obtaining inputting detection platform
5th step, using output three-phase voltage command as modulated signal compared with triangular carrier, output obtains PWM control letter
Number, detection device is opened and is turned off according to pwm signal control IGBT, to realize that output voltage is followed to signal is determined.
In conclusion technical solution of the present invention, can be realized each disturbance quantity closed loop control, improves detection platform
Output accuracy, to improve by the accuracy of detection device adaptive testing.The stability being connected to the grid for photovoltaic, wind power equipment
Provide reliable verifying early period.
Those skilled in the art after considering the specification and implementing the invention disclosed here, will readily occur to of the invention its
Its embodiment.This application is intended to cover any variations, uses, or adaptations of the invention, these modifications, purposes or
Person's adaptive change follows general principle of the invention and including the undocumented common knowledge in the art of the present invention
Or conventional techniques.The description and examples are only to be considered as illustrative, and true scope and spirit of the invention are by following
Claim is pointed out.
It should be understood that the present invention is not limited to the precise structure already described above and shown in the accompanying drawings, and
And various modifications and changes may be made without departing from the scope thereof.The scope of the present invention is limited only by the attached claims.
Claims (6)
1. a kind of method for grid adaptability detection device injection disturbance quantity, which is characterized in that the described method includes:
It gets parms, determines object intrusion mode；
Given parameters are inputted according to object intrusion mode, three-phase voltage amplitude and frequency Setting signal is calculated；
Three-phase output voltage is acquired, amplitude, the frequency of three-phase voltage are calculated, generates feedback signal；
By Setting signal, feedback signal, input disturbance amount controller adjusts to obtain output voltage instruction signal；
The voltage command signal is compared with the triangular carrier, output obtains pwm control signal, according to the PWM
Signal control IGBT is opened and is turned off.
2. the method according to claim 1, wherein
There are three types of perturbation modes:
Mode 1 is voltage swell, temporarily drop, fluctuation, flickering and frequency fluctuation；
Mode 2 is imbalance of three-phase voltage；
Mode 3 is harmonic injection mode；
The mode 1 is used to indicate input voltage amplitude and frequency given parameters, and other parameters input is invalid；
The mode 2 is used to indicate input imbalance of three-phase voltage given parameters, and other parameters input is invalid；
The mode 3 is used to indicate input harmonics order and corresponding harmonic content parameter, and other parameters input is invalid.
3. method according to claim 2, which is characterized in that when the mode is mode 2, the calculating three-phase voltage
The step of amplitude includes:
Park coordinate transform is carried out to three-phase output voltage and obtains positive sequence DC voltage component and 2 frequency multiplication alternating voltage of negative phase-sequence point
Amount；
Component of voltage after coordinate transform is filtered by 2 frequency multiplication notch filters, obtains positive sequence DC voltage component；
Positive sequence DC voltage component is carried out anti-Park to convert to obtain three-phase positive sequence alternating current voltage component；
Three-phase positive sequence voltage component, which is subtracted, with three-phase output voltage obtains three-phase negative/positive component of voltage；
Calculate separately the amplitude of positive sequence voltage and negative sequence voltage.
4. according to the method described in claim 3, it is characterized in that, the input harmonics order and corresponding harmonic content parameter tool
Body are as follows:
Input harmonics order and corresponding harmonic wave account for fundamental wave percentage parameter.
5. according to the method described in claim 4, it is characterized in that, the voltage instruction information includes: amplitude in conjunction with frequency.
6. a kind of device for grid adaptability detection device injection disturbance quantity, which is characterized in that described device includes:
Acquiring unit determines object intrusion mode for getting parms；
Computing unit is calculated three-phase voltage amplitude and frequency is given for inputting given parameters according to object intrusion mode
Signal；
Generation unit calculates amplitude, the frequency of three-phase voltage, generates feedback signal for acquiring three-phase output voltage；
Input unit is used for Setting signal, feedback signal, and input disturbance amount controller adjusts to obtain output voltage instruction letter
Number；
Control unit, for the voltage command signal to be compared with the triangular carrier, output obtains PWM control letter
Number, it opens and turns off according to pwm signal control IGBT.
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| CN116073676A (en) * | 2023-01-07 | 2023-05-05 | 安徽大学 | DC voltage self-adaptive adjustment method for three-phase current source type rectifier |
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| CN113740651A (en) * | 2021-09-06 | 2021-12-03 | 苏州溯驭技术有限公司 | Quality detection method suitable for three-phase frequency converter input power grid |
| CN113740651B (en) * | 2021-09-06 | 2024-06-04 | 苏州溯驭技术有限公司 | Quality detection method suitable for three-phase frequency converter input power grid |
| CN116073676A (en) * | 2023-01-07 | 2023-05-05 | 安徽大学 | DC voltage self-adaptive adjustment method for three-phase current source type rectifier |
| CN116073676B (en) * | 2023-01-07 | 2023-08-22 | 安徽大学 | DC voltage self-adaptive adjustment method for three-phase current source type rectifier |
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