CN110108947A - Disturb the impedance frequency sweep control method of mixed injection - Google Patents
Disturb the impedance frequency sweep control method of mixed injection Download PDFInfo
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- CN110108947A CN110108947A CN201910383682.1A CN201910383682A CN110108947A CN 110108947 A CN110108947 A CN 110108947A CN 201910383682 A CN201910383682 A CN 201910383682A CN 110108947 A CN110108947 A CN 110108947A
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/16—Measuring impedance of element or network through which a current is passing from another source, e.g. cable, power line
Abstract
The present invention provides a kind of impedance frequency sweep control methods for disturbing mixed injection.Impedance frequency sweep control device involved in this method includes disturbance mixed injection unit and disturbance control unit.An impedance frequency sweep control method disturbing signal settable by disturbance mixed injection device injection duration, amplitude, by comparing a disturbance response amplitude and fundamental voltage amplitude ratio relation in advance, the disturbance injection mode for meeting precision and system stability is selected to inject as Secondary Disturbance.The response for disturbing grid-connection device under control unit acquisition Secondary Disturbance, is calculated the impedance of grid-connection device.The method mentioned is realized simply, and the effective choice accuracy of energy is high, and small disturbance injection mode is influenced on system stability.Provided impedance frequency sweep control device can be realized voltage and current disturbance injection.It provides the foundation to the stability analysis based on impedance.
Description
Technical field
The invention belongs to power quality and control field, it is related to voltage disturbance current disturbing mixing note under a kind of grid-connected conditions
The impedance frequency sweeping method entered provides the choosing that injection is disturbed in a kind of sweep measurement of design impedance in distributed power generation research
Selection method.
Technical background
Grid-connected system stability analysis based on impedance, needs to learn the impedance of electric network impedance and grid-connection device.And impedance
Frequency sweep experiments can be known in the case where not needing to obtain the control structure and parameter of grid-connection device by impedance Frequency sweep experiments
The output impedance of grid-connection device.Existing impedance measurement technique application, generally use the single mode that is directly injected into of disturbance or
It is measured using Injection Current perturbation scheme or is measured using injecting voltage perturbation scheme, there is certain limitation.Such as:
1) king's Yun journey, Chen Xin and Chen Jie are published in the 21st phase of volume 36 on November 5th, 2016 " Proceedings of the CSEE "
On " the three-phase LCL type gird-connected inverter positive-negative sequence impedance modeling analysis based on harmonic linearization ", this article use be based on voltage
Disturb the impedance sweep method of injection, this mode is smaller or when electric network impedance is larger in impedance to be measured, impedance response to be measured
Very little influences measurement accuracy.And the mode of voltage disturbance injection at this time, more likely becomes grid-connection device impedance and power grid hinders
The anti-driving source that series resonance occurs, deteriorates the stability of system.
2) king one, Liu Shu and Liu Jianzheng were published on the 9th phase of volume 38 on May 5th, 2018 " Proceedings of the CSEE "
" research of distributed inverter grid-connected system resonance mechanism ", this article uses the impedance sweep method that injects based on current disturbing,
This injection mode is when impedance to be measured is very big, and due to the shunting function of electric network impedance, impedance response very little to be measured can be brought very
The measurement accuracy of big measurement error, impedance is not high.And the mode of current disturbing injection at this time, more likely becomes grid-connected and sets
The driving source of parallel resonance occurs for standby impedance and electric network impedance, deteriorates the stability of system.
Existing impedance measurement technique or use Injection Current perturbation scheme are measured or are disturbed using injecting voltage
Mode measures, in grid-connected on-line measurement impedance Shi Douyou certain limitation.When tested impedance is smaller, electric network impedance is larger, uses
It is smaller due to responding when the mode of voltage disturbance, so that measurement accuracy is poor；Similarly, when tested impedance is larger, is disturbed using electric current
When flowing mode, since electric network impedance is smaller, shunts biggish effect, the current perturbation very little of impedance to be measured is flowed into, therefore to be measured
The disturbance injection mode that response very little, the measurement accuracy of impedance are poor and single not can avoid as impedance to be measured and power grid
The excitation source problem of resonance between impedance.In view of the above-mentioned problems, proposing the impedance measurement of voltage disturbance current disturbing mixed injection
Method, according to the response magnitude of injection test disturbance, Response to selection is larger and will not infuse to the stable disturbance impacted of system
Enter mode to measure, obtains the impedance of different frequency sections.
In conclusion existing impedance measurement technique has the following problems:
1, single disturbance injection frequency sweeping method responds smaller, survey when grid-connection device impedance differs larger with electric network impedance
Accuracy of measurement is poor；
2, single disturbance injection mode not can avoid and swash as resonance in grid-connection device impedance and power grid generation resonant mode
The problem of encouraging source.
Summary of the invention
Present example provides the impedance frequency sweep disturbance selection method and disturbance voltage, electric current mixed injection of grid-connection device
Experimental facilities.For solving, measurement accuracy in the case of single disturbance injection is low and single disturbance bring resonant excitation is asked
Topic.
To solve technical problem of the invention, the present invention provides a kind of impedance frequency sweep controlling parties for disturbing mixed injection
Method, used technical solution are as follows: on the basis of traditional disturbance injection, be injected separately into the settable voltage of time, amplitude, electricity
Current test disturbance detects the response of two kinds of disturbance excitations, and more different tests disturb sizes of the lower response relative to fundamental wave, thus
It selects that a kind of precision is high, the disturbance injection mode small to equipment steady-state operation, and then measures the impedance magnitude of grid-connection device.
The object of the present invention is achieved like this.The present invention provides a kind of impedance frequency sweep controlling parties for disturbing mixed injection
Method, wherein topological structure involved in the impedance frequency sweep control method of disturbance mixed injection includes power grid, grid-connection device, access electricity
Disturbance impedance frequency-sweeping apparatus at the point of common coupling PCC that net is connected with grid-connection device；The disturbance impedance frequency-sweeping apparatus packet
Include disturbance mixed injection unit, disturbance control unit；The disturbance mixed injection unit includes disturbance voltage injection unit and disturbs
Streaming current injection unit, the disturbance control unit includes sampling unit and selection and computing unit；The disturbance voltage injection
The point of common coupling PCC that unit series connection access power grid is connected with grid-connection device, the electric current injection unit parallel connection access power grid
The point of common coupling PCC being connected with grid-connection device, the public coupling that the sampling unit access power grid is connected with grid-connection device
Chalaza PCC samples the voltage and current of point of common coupling PCC, the input terminal and sampling unit of the selection and computing unit
Output end is connected, and the selection and computing unit are connected with disturbance mixed injection unit communications；
This control method passes through compares primary voltage, the response amplitude of current disturbing and fundamental voltage amplitude ratio relation in advance,
Selection injection Secondary Disturbance, carry out impedance measurement, specifically, this control method the following steps are included:
Step 1, parameter setting, including following parameter:
Current period forcing frequency ω, disturbance spacing frequency difference Δ ω, maximum perturbation frequencies omegamax, a disturbance voltage width
Value Autest, a current perturbation amplitude Aitest, primary disturbance injection duration Ttest, a disturbance response accounts for the maximum of fundamental wave
Percentage M, Secondary Disturbance is allowed to inject duration Tmeas, Secondary Disturbance voltage magnitude Aumeas, Secondary Disturbance current amplitude
Aimeas；
Step 2, the point of common coupling PCC disturbance access grid-connected equipment of mixed injection device being connected with power grid；
Step 3, fundamental voltage amplitude when acquiring grid-connection device stable operation by sampling unit at point of common coupling PCC
U1, fundamental current amplitude I1；
Step 4, by disturbance voltage injection unit to injection amplitude at point of common coupling PCC be a disturbance voltage amplitude
Autest, the duration be that duration T is injected in primary disturbancetest, frequency be current period forcing frequency ω test voltage disturb
It is dynamic；By electric current injection unit to injection amplitude at point of common coupling PCC be a current perturbation amplitude Aitest, the duration be
Primary disturbance injection duration Ttest, frequency be current period forcing frequency ω test current disturbing；
Step 5, record point of common coupling PCC is in the lower current-responsive of the disturbance of test voltage described in step 4 in current period
The amplitude of the harmonic current of forcing frequency ω, and it is denoted as harmonic current response amplitude Ai1(ω) calculates harmonic current response amplitude
Ai1(ω) and fundamental current amplitude I1Between ratio relation ru, and be denoted as electric current ratio ru, ru=Ai1(ω)/I1；
Step 6, record point of common coupling PCC is in described in step 4 under test current disturbing voltage responsive in current period
The amplitude of the harmonic voltage of forcing frequency ω is denoted as harmonic voltage response amplitude Au1(ω) calculates harmonic voltage response amplitude Au1
(ω) and fundamental voltage amplitude U1Between ratio relation ri, and be denoted as voltage ratio ri, ri=Au1(ω)/U1；
Step 7, compare the maximum allowable percentage M that electric current ratio ru, voltage ratio ri, a disturbance response account for fundamental wave, go forward side by side
The following selection of row:
If ru < M and ri < M and ru >=ri or ru < M and ri >=M, enter step 8,
If ru < M and ri < M and ru < ri or ru >=M and ri < M, enter step 9,
If ru >=M and ri >=M, enter step 11；
It step 8, is again Secondary Disturbance to the injection duration at point of common coupling PCC by disturbance voltage injection unit
Inject duration Tmeas, amplitude be Secondary Disturbance voltage magnitude Aumeas, frequency be current period forcing frequency ω test electricity
Pressure disturbance, subsequently into step 10；
It step 9, is again Secondary Disturbance to the injection duration at point of common coupling PCC by current perturbation injection unit
Inject duration Tmeas, amplitude be Secondary Disturbance current amplitude Aimeas, frequency be current period forcing frequency ω test electricity
Flow disturbance；
Step 10, record point of common coupling PCC is under Secondary Disturbance voltage responsive current period forcing frequency ω's
The amplitude and phase of harmonic voltage are denoted as voltage harmonic component amplitude Au2The phase P of (ω) and voltage harmonic componentu2(ω)；Note
Record point of common coupling PCC is in amplitude and phase of the current-responsive in frequency for current period forcing frequency ω under Secondary Disturbance,
It is denoted as current harmonics component amplitude Ai2(ω) and current harmonics component phase Pi2(ω)；Grid-connection device output impedance Z is calculated to disturb
Impedance magnitude under dynamic frequency ω | Z (ω) | and impedance phase ∠ Z (ω):
Step 11, increase a disturbance spacing frequency difference Δ ω on current period forcing frequency ω and obtain next period and disturb
Dynamic frequency ω ', ω '=ω+Δ ω；
If ω '≤ωmax, return step 4, and by next periodic perturbation frequencies omega ' substitute into current period forcing frequency ω into
Enter the injection and control in next period；
If ω ' > ωmax, control terminates.
Compared with the existing technology, beneficial effects of the present invention are as follows:
1) selection biggish disturbance injection mode of disturbance response when not influencing grid-connection device steady-state operation, can be effective
Avoid as respond it is too small caused by measurement error, can be very good to realize the precise measurement to impedance.
2) it can be avoided disturbance injection to impact the steady operation and safety of equipment, and will not influence measurement accuracy.
3) experimental provision of the invention, which can inject disturbance voltage, can also inject current perturbation.
Detailed description of the invention
Fig. 1 is topological diagram involved in the impedance frequency sweep control method of present invention disturbance mixed injection；
Fig. 2 is the flow chart of control method of the present invention；
Fig. 3 is the model topology figure established in embodiment；
Fig. 4 is traditional single electric current disturbance injection and the contrast effect figure using this method；
Fig. 5 is traditional univoltage disturbance injection and the contrast effect figure using this method.
Specific embodiment
With reference to the accompanying drawing, embodiment of the present invention is illustrated with specific example.
Fig. 1 show topological diagram involved in the impedance frequency sweep control method of present invention disturbance mixed injection.It can by Fig. 1
See, topological structure involved in impedance frequency sweep control method includes power grid 10, grid-connection device 40, access power grid 10 and grid-connection device
Disturbance impedance frequency-sweeping apparatus at the 40 point of common coupling PCC being connected.
The disturbance impedance frequency-sweeping apparatus includes disturbance mixed injection unit 20, disturbance control unit 30.The disturbance is mixed
Closing injection unit 20 includes disturbance voltage injection unit 201 and current perturbation injection unit 202, and the disturbance control unit 30 is wrapped
Include sampling unit 301 and selection and computing unit 302.The disturbance voltage injection unit 201 series connection access power grid 10 with it is grid-connected
The point of common coupling PCC that equipment 40 is connected, the electric current injection unit 202 access power grid 10 in parallel are connected with grid-connection device 40
The point of common coupling PCC connect, the sampling unit 301 access the point of common coupling PCC that power grid 10 is connected with grid-connection device 40,
The input terminal of the voltage and current of sampling point of common coupling PCC, the selection and computing unit 302 is defeated with sampling unit 301
Outlet is connected, and the selection and computing unit 302 are connected by communication with disturbance mixed injection unit 20 and connect.
The line voltage virtual value of power grid 40 is that 380V, power grid equivalent inductance Lg distinguish in measurement twice in the present embodiment
For 0.001mH, 100H, grid-connection device is LC load, and wherein L is 0.001H, C 0.0001F.
This control method passes through compares primary voltage, the response amplitude of current disturbing and fundamental voltage amplitude ratio relation in advance,
Selection injection Secondary Disturbance, carries out impedance measurement, specifically, passing through the response amplitude for comparing primary voltage, current disturbing in advance
With fundamental voltage amplitude ratio relation, Response to selection it is big and will not to the disturbance that system stability impacts as Secondary Disturbance, into
Row impedance measurement,
Specific process referring to fig. 2, from Figure 2 it can be seen that this control method the following steps are included:
Step 1, parameter setting, including following parameter:
Current period forcing frequency ω, disturbance spacing frequency difference Δ ω, maximum perturbation frequencies omegamax, a disturbance voltage width
Value Autest, a current perturbation amplitude Aitest, primary disturbance injection duration Ttest, a disturbance response accounts for the maximum of fundamental wave
Percentage M, Secondary Disturbance is allowed to inject duration Tmeas, Secondary Disturbance voltage magnitude Aumeas, Secondary Disturbance current amplitude
Aimeas。
In the present embodiment, ω 10Hz, Δ ω are 0.6db, ωmaxFor 10000Hz, AutestFor 3.11V, AitestFor
0.001A、TtestFor 0.1 second, TmeasFor 1 second, AumeasFor 15.33V, AimeasFor 0.005A, M 2%.
Step 2, the point of common coupling disturbance access grid-connected equipment 40 of mixed injection device 20 being connected with power grid 10
PCC。
Step 3, fundamental voltage when acquiring 40 stable operation of grid-connection device by sampling unit 30 at point of common coupling PCC
Amplitude U1, fundamental current amplitude I1。
Step 4, by disturbance voltage injection unit 201 to injection amplitude at point of common coupling PCC be a disturbance voltage
Amplitude Autest, the duration be that duration T is injected in primary disturbancetest, frequency be current period forcing frequency ω test electricity
Pressure disturbance；By electric current injection unit 202 to injection amplitude at point of common coupling PCC be a current perturbation amplitude Aitest, hold
The continuous time is that duration T is injected in primary disturbancetest, frequency be current period forcing frequency ω test current disturbing.
Step 5, record point of common coupling PCC is in the lower current-responsive of the disturbance of test voltage described in step 4 in current period
The amplitude of the harmonic current of forcing frequency ω, and it is denoted as harmonic current response amplitude Ai1(ω) calculates harmonic current response amplitude
Ai1(ω) and fundamental current amplitude I1Between ratio relation ru, and be denoted as electric current ratio ru, ru=Ai1(ω)/I1。
Step 6, record point of common coupling PCC is in described in step 4 under test current disturbing voltage responsive in current period
The amplitude of the harmonic voltage of forcing frequency ω is denoted as harmonic voltage response amplitude Au1(ω) calculates harmonic voltage response amplitude Au1
(ω) and fundamental voltage amplitude U1Between ratio relation ri, and be denoted as voltage ratio ri, ri=Au1(ω)/U1。
Step 7, compare the maximum allowable percentage M that electric current ratio ru, voltage ratio ri, a disturbance response account for fundamental wave, go forward side by side
The following selection of row:
If ru < M and ri < M and ru >=ri or ru < M and ri >=M, enter step 8,
If ru < M and ri < M and ru < ri or ru >=M and ri < M, enter step 9,
If ru >=M and ri >=M, enter step 11.
It step 8, is again secondary to the injection duration at point of common coupling PCC by disturbance voltage injection unit 201
Disturbance injection duration Tmeas, amplitude be Secondary Disturbance voltage magnitude Aumeas, frequency be current period forcing frequency ω survey
Voltage disturbance is tried, subsequently into step 10.
It step 9, is again secondary to the injection duration at point of common coupling PCC by current perturbation injection unit 202
Disturbance injection duration Tmeas, amplitude be Secondary Disturbance current amplitude Aimeas, frequency be current period forcing frequency ω survey
Try current disturbing.
Step 10, record point of common coupling PCC is under Secondary Disturbance voltage responsive current period forcing frequency ω's
The amplitude and phase of harmonic voltage are denoted as voltage harmonic component amplitude Au2The phase P of (ω) and voltage harmonic componentu2(ω)；Note
Record point of common coupling PCC is in amplitude and phase of the current-responsive in frequency for current period forcing frequency ω under Secondary Disturbance,
It is denoted as current harmonics component amplitude Ai2(ω) and current harmonics component phase Pi2(ω)；Grid-connection device output impedance Z is calculated to disturb
Impedance magnitude under dynamic frequency ω | Z (ω) | and impedance phase ∠ Z (ω).
Step 11, increase a disturbance spacing frequency difference Δ ω on current period forcing frequency ω and obtain next period and disturb
Dynamic frequency ω ', ω '=ω+Δ ω.
If ω '≤ωmax, return step 4, and by next periodic perturbation frequencies omega ' substitute into current period forcing frequency ω into
Enter the injection and control in next period；
If ω ' > ωmax, control terminates.
The model that grid-connection device is LC load circuit is built according to Fig. 3 in software Matlab/Simulink to open up
Flutter figure, the fundamental frequency ω of power grid1It is 0.001HC for 100 π rad/s, LC load circuit L1 is 0.0001F.It can be compiled using one
Journey voltage source constitutes power grid, using an equivalent electric network impedance of inductance Lg, inductance Lg be respectively in measurement twice 0.001mH,
100H, grid line voltage virtual value Up=380V.
Under the conditions of different electric network impedances, impedance frequency sweep twice is carried out to LC load using this method.Fig. 4 is to be in Lg
When 0.001mH, conventional current disturbs injection mode frequency sweep result and impedance frequency sweep result and LC load impedance using this method
The comparison diagram of theoretical curve, in the biggish low-frequency range of grid-connection device impedance, due to larger, the grid-connection device of the smaller shunting of electric network impedance
Response very little, measurement accuracy is low, impedance measurements inaccuracy.And the impedance frequency sweep for the disturbance mixed injection that the present invention is mentioned
Device and control method can select, precision higher disturbance injection mode small to system influence on system operation, use electricity in this frequency range
Pressure disturbance injection frequency sweep, measurement result are higher.Fig. 5 is that conventional voltage disturbs injection mode frequency sweep result and makes when Lg is 100H
With the comparison diagram of the impedance frequency sweep result of this method and LC load impedance theoretical curve, due to grid-connection device impedance at this time and power grid
Impedance has resonance risk, and univoltage disturbance injection frequency sweeping method meeting excitation system resonance, harmonic wave interference is big, and measurement result is inaccurate
Really.And the impedance frequency-sweeping apparatus and control method for the disturbance mixed injection that the present invention is mentioned, it can select to system influence on system operation
Small, the higher disturbance injection mode of precision injects frequency sweep using current disturbing in this frequency range, system is avoided to generate resonance, can
Measure the impedance of grid-connection device.By comparing different traditional approach, the impedance of this method measurement is more accurate, grid-connection device
Stable operation can be protected.Demonstrate the validity of the present apparatus and method.
In conclusion this method realizes the response magnitude selection injection disturbance side that simply only needs to detect, compare test disturbance
Formula extracts amplitude and phase, computing impedance that measurement disturbs the voltage and current of lower grid-connection device, has certain feasibility.
Claims (1)
1. a kind of impedance frequency sweep control method for disturbing mixed injection, wherein the impedance frequency sweep control method institute of disturbance mixed injection
The topological structure being related to includes power grid (10), grid-connection device (40), accesses the public affairs that power grid (10) are connected with grid-connection device (40)
Disturbance impedance frequency-sweeping apparatus at Coupling point PCC altogether；The disturbance impedance frequency-sweeping apparatus include disturbance mixed injection unit (20),
It disturbs control unit (30)；The disturbance mixed injection unit (20) includes disturbance voltage injection unit (201) and current perturbation
Injection unit (202), the disturbance control unit (30) include sampling unit (301) and selection and computing unit (302)；It is described
The point of common coupling PCC that disturbance voltage injection unit (201) series connection access power grid (10) is connected with grid-connection device (40), it is described
The point of common coupling PCC that electric current injection unit (202) access power grid (10) in parallel is connected with grid-connection device (40), the sampling
The point of common coupling PCC that unit (301) access power grid (10) is connected with grid-connection device (40), sampling point of common coupling PCC's
The input terminal of voltage and current, the selection and computing unit (302) is connected with the output end of sampling unit (301), the choosing
Select and computing unit (302) and disturbance mixed injection unit (20) communication connection；
It is characterized by: this control method by comparing primary voltage, the response amplitude of current disturbing and fundamental voltage amplitude ratio in advance
Value relationship, selection injection Secondary Disturbance, carry out impedance measurement, specifically, this control method the following steps are included:
Step 1, parameter setting, including following parameter:
Current period forcing frequency ω, disturbance spacing frequency difference Δ ω, maximum perturbation frequencies omegamax, a disturbance voltage amplitude
Autest, a current perturbation amplitude Aitest, primary disturbance injection duration Ttest, a disturbance response account for the maximum of fundamental wave and permit
Perhaps percentage M, Secondary Disturbance inject duration Tmeas, Secondary Disturbance voltage magnitude Aumeas, Secondary Disturbance current amplitude Aimeas；
Step 2, point of common coupling disturbance mixed injection device (20) access grid-connected equipment (40) being connected with power grid (10)
PCC；
Step 3, fundamental wave electricity when acquiring grid-connection device (40) stable operation by sampling unit (301) at point of common coupling PCC
Pressure amplitude value U1, fundamental current amplitude I1；
Step 4, by disturbance voltage injection unit (201) to injection amplitude at point of common coupling PCC be a disturbance voltage width
Value Autest, the duration be that duration T is injected in primary disturbancetest, frequency be current period forcing frequency ω test voltage
Disturbance；By electric current injection unit (202) to injection amplitude at point of common coupling PCC be a current perturbation amplitude Aitest, hold
The continuous time is that duration T is injected in primary disturbancetest, frequency be current period forcing frequency ω test current disturbing；
Step 5, record point of common coupling PCC is in current-responsive under test voltage described in step 4 disturbs and disturbs in current period
The amplitude of the harmonic current of frequencies omega, and it is denoted as harmonic current response amplitude Ai1(ω) calculates harmonic current response amplitude Ai1
(ω) and fundamental current amplitude I1Between ratio relation ru, and be denoted as electric current ratio ru, ru=Ai1(ω)/I1；
Step 6, record point of common coupling PCC is in voltage responsive under test current disturbing described in step 4 and disturbs in current period
The amplitude of the harmonic voltage of frequencies omega is denoted as harmonic voltage response amplitude Au1(ω) calculates harmonic voltage response amplitude Au1(ω)
With fundamental voltage amplitude U1Between ratio relation ri, and be denoted as voltage ratio ri, ri=Au1(ω)/U1；
Step 7, compare the maximum allowable percentage M that electric current ratio ru, voltage ratio ri, a disturbance response account for fundamental wave, and carry out such as
Lower selection:
If ru < M and ri < M and ru >=ri or ru < M and ri >=M, enter step 8,
If ru < M and ri < M and ru < ri or ru >=M and ri < M, enter step 9,
If ru >=M and ri >=M, enter step 11；
It step 8, is again secondary disturb to the injection duration at point of common coupling PCC by disturbance voltage injection unit (201)
Dynamic injection duration Tmeas, amplitude be Secondary Disturbance voltage magnitude Aumeas, frequency be current period forcing frequency ω test
Voltage disturbance, subsequently into step 10；
It step 9, is again secondary disturb to the injection duration at point of common coupling PCC by current perturbation injection unit (202)
Dynamic injection duration Tmeas, amplitude be Secondary Disturbance current amplitude Aimeas, frequency be current period forcing frequency ω test
Current disturbing；
Step 10, record point of common coupling PCC is under Secondary Disturbance voltage responsive in the harmonic wave of current period forcing frequency ω
The amplitude and phase of voltage are denoted as voltage harmonic component amplitude Au2The phase P of (ω) and voltage harmonic componentu2(ω)；Record is public
Coupling point PCC is in current-responsive under Secondary Disturbance and is denoted as in amplitude and phase that frequency is current period forcing frequency ω altogether
Current harmonics component amplitude Ai2(ω) and current harmonics component phase Pi2(ω)；Grid-connection device output impedance Z is calculated in disturbance frequency
Impedance magnitude under rate ω | Z (ω) | and impedance phase ∠ Z (ω):
Step 11, increase a disturbance spacing frequency difference Δ ω on current period forcing frequency ω and obtain next periodic perturbation frequency
Rate ω ', ω '=ω+Δ ω；
If ω '≤ωmax, return step 4, and will be under next periodic perturbation frequencies omega ' substitution current period forcing frequency ω entrance
The injection and control in one period；
If ω ' > ωmax, control terminates.
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| CN111537794A (en) * | 2020-05-21 | 2020-08-14 | 国网江苏省电力有限公司电力科学研究院 | Topological system, control method and storage medium of three-port impedance frequency sweeping device |
| CN111537799A (en) * | 2020-05-21 | 2020-08-14 | 国网江苏省电力有限公司电力科学研究院 | Topological system, control method and storage medium of series-parallel connection integrated harmonic disturbance injection impedance frequency sweeping device |
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