CN109001573A - Wind power plant current collection congruence stream busbar short-circuit holds method for determination of amount - Google Patents
Wind power plant current collection congruence stream busbar short-circuit holds method for determination of amount Download PDFInfo
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Abstract
The embodiment provides a kind of wind power plant current collection congruence stream busbar short-circuits to hold method for determination of amount.The determining method includes: to obtain voltage value when the reactive power of grid-connected bus test point is zero and at least two groups reactive power value and corresponding voltage value；Voltage value and at least two groups reactive power value and corresponding voltage value when according to reactive power compensation relationship, the reactive power of wind power plant being zero, obtain grid-connected busbar short-circuit capacity；According to wind power plant primary system structure, it is based on grid-connected busbar short-circuit capacity, current collection congruence stream busbar short-circuit capacity is calculated using short-circuit impedance conversion mode.Wind power plant current collection congruence stream busbar short-circuit through the invention holds method for determination of amount, realize it is accurate, dynamically test busbar short-circuit capacity, to which the access system power to determine wind power plant provides foundation, while reference frame is provided for the adjustment of the control parameter of blower and reactive power compensation device.
Description
The application is entitled busbar short-circuit capacity test method, device application No. is CN201610086362.6
And the divisional application of system.
Technical field
The present invention relates to technical field of wind power more particularly to a kind of determinations of wind power plant current collection congruence stream busbar short-circuit capacity
Method.
Background technique
In recent years, China's wind power technology remains quick, extensive development situation, plans on northwest, Inner Mongol and other places
Build ten million multikilowatt wind power base.Large-scale wind electricity base and large-scale wind power field construction, for power grid receiving ability and
Power grid power has more requirements.Wherein, operation capacity of short circuit is to characterize an important ginseng of Operation of Electric Systems feature
Number, the size of capacity of short circuit reflect the tightness degree contacted between the bus and electric system.As it can be seen that estimation operation short circuit is held
Amount is of great significance to the power and Voltage Stability Level of assessment system.
In general, the prior art simulates actual measurement using static estimation algorithm, based on neural network prediction method, using big load disturbance
Method and utilization Thevenin's theorem and switching capacitance estimation algorithm.However, above-mentioned four kinds of methods have following shortcoming: first is that for
Static estimation algorithm, can system impedance one for reference be only assign it is primary, be it is static, and real system impedance be it is dynamic,
This estimation mode accuracy is not high；Second is that calculation amount is larger, and model training process for being based on neural network prediction method
It is not easy to hold；Third is that being difficult to realize the real-time monitoring under normal operating conditions using big load disturbance simulation measurement method；Fourth is that sharp
Belong to K-theoretic operation K with Thevenin's theorem and switching capacitance estimation algorithm, it is not very practical.
Summary of the invention
The purpose of the embodiment of the present invention is, provides a kind of determination side of wind power plant current collection congruence stream busbar short-circuit capacity
Method, with realize it is accurate, dynamically test busbar short-circuit capacity, thus for judgement wind power plant access system power provide according to
According to practical.
For achieving the above object, the embodiment provides a kind of wind power plant current collection congruence stream busbar short-circuit appearances
Method for determination of amount, the determining method include: the voltage value obtained when the reactive power of grid-connected bus test point is zero, and
At least two groups reactive power value and corresponding voltage value；According to the reactive power compensation relationship of the wind power plant, the nothing
Voltage value and at least two groups reactive power value and corresponding voltage value when function power is zero, obtain described grid-connected
Busbar short-circuit capacity；According to wind power plant primary system structure, it is based on grid-connected busbar short-circuit capacity, mode is converted using short-circuit impedance
Calculate current collection congruence stream busbar short-circuit capacity.
Wind power plant current collection congruence stream busbar short-circuit provided in an embodiment of the present invention holds method for determination of amount, grid-connected by obtaining
Voltage value and at least two groups reactive power value and corresponding voltage value when the reactive power of bus test point is zero,
Voltage value and at least two groups reactive power when being further zero according to reactive power compensation relationship, the reactive power of wind power plant
Value and corresponding voltage value, realize it is accurate, dynamically test grid-connected busbar short-circuit capacity, thus to determine wind power plant
Access system power provide foundation, while for the control parameter of blower and reactive power compensation device adjustment provide reference according to
According to practical.
Detailed description of the invention
Fig. 1 is the flow diagram of the busbar short-circuit capacity test method of the embodiment of the present invention one；
Fig. 2 is the application scenarios schematic diagram of the busbar short-circuit capacity test method of the embodiment of the present invention one；
Fig. 3 is one of the schematic illustration of reactive power compensation of the embodiment of the present invention one；
Fig. 4 is the two of the schematic illustration of the reactive power compensation of the embodiment of the present invention one；
Fig. 5 is 220kV observing and controlling loop terminals lead figure in the application scenarios of busbar short-circuit capacity test method shown in Fig. 2；
Fig. 6 is main transformer low-pressure side observing and controlling circuit end in the application scenarios of busbar short-circuit capacity test method shown in Fig. 2
Sub- lead figure；
Fig. 7 is the wiring signal of electric energy quality test instrument in the application scenarios of busbar short-circuit capacity test method shown in Fig. 2
Figure；
Fig. 8 is wind power plant primary system rough schematic view in the application scenarios of busbar short-circuit capacity test method shown in Fig. 2；
Fig. 9 is the structural schematic diagram of the busbar short-circuit volume test device of the embodiment of the present invention two.
Specific embodiment
Busbar short-circuit of embodiment of the present invention capacity test method, apparatus and system are retouched in detail with reference to the accompanying drawing
It states.
Basic conception of the invention is to test the busbar short-circuit under wind power plant operating status based on reactive power compensation principle
Capacity.Accordingly, for the adjustment for the control parameter for judging windfarm system power and blower and reactive power compensation device
With reference significance, it is also convenient for reducing system disturbance, regulator control system voltage using active mode, while guaranteeing system stability.
Without biggish calculation amount, and it is practical.
Embodiment one
Fig. 1 is the flow diagram of the busbar short-circuit capacity test method of the embodiment of the present invention one, can be in such as embodiment two
This method is executed on the busbar short-circuit volume test device, as shown in Figure 1, under wind power plant operating status, busbar short-circuit
Capacity test method includes:
Step 101: voltage value and at least two groups reactive power when the reactive power for obtaining test point on bus is zero
Value and corresponding voltage value.
It should be noted that bus can be specially grid-connected bus and/or current collection line bus rod.
Here, wind power plant may include reactive power compensation device, according to the present invention exemplary embodiment, and step 101 can
It include: the output capacity by adjusting reactive power compensation device, to detect when the reactive power of test point on bus is zero
Voltage value and at least two groups reactive power value and corresponding voltage value.
Specifically, the processing of the output capacity of above-mentioned adjustment reactive power compensation device can include: obtain the pre- of test point
If voltage range of operation and static capacity of short circuit；According to voltage range of operation and static capacity of short circuit, output capacity is calculated
Adjustable range；According to the adjustable range for the output capacity being calculated and preset adjusting step, reactive power compensation dress is adjusted
The output capacity set.
It should be noted that above-mentioned static state capacity of short circuit refer to by higher level's electric dispatching department according to annual running mode and
It is assumed that several arbitrary boundary conditions, system impedance of each bus of the same level power grid under large and small two ways is provided, according to giving
The calculated capacity of short circuit of system impedance out.
In concrete implementation mode, Fig. 2 is the applied field of the busbar short-circuit capacity test method of the embodiment of the present invention one
Scape schematic diagram, as shown in Figure 2, in wind power plant, reactive power compensation device and blower collect route, through main transformer of transformer substation
It is connected by substation's outlet route with electric system after boosting.220kV bus is aforementioned grid-connected bus, 35kV bus in Fig. 2
It is aforementioned current collection line bus rod.For example, can by Fig. 2 shows substation 220kV bus test point and substation 35kV it is female
Line test point is as point in need of test.As soon as adjusting the output capacity of time reactive power compensation device, records and survey
Voltage value and at least two groups reactive power value and corresponding voltage value when the reactive power of pilot is zero.Wherein, remember
The power data and voltage data of record can be completed using associated assay devices (such as electric energy quality test instrument).
Step 102: the voltage value and at least two when according to reactive power compensation relationship, the reactive power of wind power plant being zero
Group reactive power value and corresponding voltage value, obtain busbar short-circuit capacity.
Exemplary embodiment according to the present invention, step 102 can include: according at least two groups reactive power value and with its electricity
Pressure value calculates reactive power changing value and voltage change；Changed according to the reactive power compensation relationship of wind power plant, reactive power
Voltage value when value and voltage change and reactive power are zero calculates busbar short-circuit capacity.
Specifically, above-mentioned according to the reactive power compensation relationship of wind power plant, reactive power changing value and voltage change, with
And voltage value of reactive power when being zero, the processing for calculating busbar short-circuit capacity can calculate busbar short-circuit and hold according to the following formula (1)
Amount:
Wherein, SSCFor busbar short-circuit capacity, U0Voltage value when for reactive power being zero at test point, Δ Q are test point
Locate reactive power changing value, Δ U is voltage change at test point.Here, formula (1) can be considered the reactive power for embodying wind power plant
The expression formula of compensation relationship.
For the ease of more clearly and accurately understanding the embodiment of the present invention, the derivation origin of formula (1) is carried out below detailed
Explanation.
Specifically, busbar short-circuit capacity shown in formula (1) is the principle based on reactive power compensation.Fig. 3 is that the present invention is real
One of the schematic illustration of reactive power compensation of example one is applied, Fig. 4 is the principle of the reactive power compensation of the embodiment of the present invention one
The two of schematic diagram.The one phase equivalent circuit schematic diagram of reactive power compensation is shown referring to Fig. 3 and Fig. 4, Fig. 3, wherein U is wind-powered electricity generation
The system voltage of field, R and X are respectively the system resistance and reactance of wind power plant.Load can be set to vary less, therefore have △ U < < U, then
It is assumed that when R < < X, Fig. 4 characteristic curve of reflection system voltage and reactive power variation.From fig. 4, it can be seen that as system supplies
The approximate characteristic curve of the increase for the reactive power Q given, system voltage U decline, system can be indicated by following formula (2) or formula (3):
Wherein, U0System voltage when for reactive power being zero, SSCFor system short circuit capacity, △ U is voltage change, △
Q is reactive power changing value.
It follows that the variation that the variation of reactive power can cause power system voltage proportional.Reactive power is put into mend
After repaying device, the reactive power of electric system supply be load reactive power used and reactive power compensation device export it is idle
The sum of power, i.e. Q=QL+Qr.Therefore, as reactive load power QLWhen variation, if the reactive power of reactive power compensation device
QrQ can be made upLVariation, so that Q is remained unchanged, so that supply voltage remains unchanged, here it is carry out dynamic benefit to reactive power
The principle repaid.By above formula (2) or formula (3), it is derived by following formula (4):
Wherein, U0System voltage when for reactive power being zero, SSCFor system short circuit capacity, △ U is the electricity at test point
Changing value is pressed, △ Q is reactive power changing value.
It should be noted that being obtained in conjunction with the busbar short-circuit capacity test method of the embodiment of the present invention by previously described formula (1)
Busbar short-circuit capacity be numerically equal to above-mentioned characterization reactive power compensation principle characteristic expression formula (4) calculating
As a result.Therefore △ Q, △ U can be obtained by on-the-spot test, to calculate capacity of short circuit SSC。
With reference to the accompanying drawing 2 and attached drawing 5 to Fig. 8, the busbar short-circuit capacity test method of the embodiment of the present invention is carried out
It is described in detail.
Fig. 2 is the application scenarios schematic diagram of the busbar short-circuit capacity test method of the embodiment of the present invention one, and Fig. 2 shows wind
Electric field 220kV booster stations, wherein 35kV bus is boosted to by 6 current collection connections, 99 units through a main transformer
Then 220kV bus is connected through substation's outlet route with electric system, reactive power compensation device is configured to a set of brilliant lock
Pipe control type reactor (TCR), compensating reactive power capacity are -30Mvar~0Mvar and three sets of filter condenser group (FC), are mended
Repaying reactive capability is 30Mvar.
In practical applications, by Fig. 2 shows substation 220kV bus test point and substation 35kV bus test point make
For point in need of test, correspondingly, detection device (such as electric energy quality test instrument) is articulated in the secondary survey of wind farm device
Circuit is controlled, the influence for second protection circuit, measurement loop is avoided.
Fig. 5 is 220kV observing and controlling loop terminals lead figure in the application scenarios of busbar short-circuit capacity test method shown in Fig. 2,
The voltage of 220kV bus test point, electric current observing and controlling loop terminals lead are as shown in figure 5, wherein A630, B630, C630, N600 are
Voltage circuit terminal, A4181, B4181, C4181, N4181 are current transformer terminal, and the 1-13 of the other side is terminal block serial number.
Fig. 6 is main transformer low-pressure side observing and controlling loop terminals lead figure in the application scenarios of busbar short-circuit capacity test method shown in Fig. 2,
Referring to Fig. 6, voltage, the electric current observing and controlling loop terminals lead of 35kV bus test point as shown in fig. 6, wherein A640 ", B640 ",
C640 ", N600 are voltage circuit terminal, and A4031, B4031, C4031, N4031 are current transformer terminal, and the 1-13 of the other side is
Terminal block serial number.By taking electric energy quality test instrument as an example, Fig. 7 is in the application scenarios of busbar short-circuit capacity test method shown in Fig. 2
The wiring schematic diagram of electric energy quality test instrument, electric energy quality test instrument mode of connection are as shown in Figure 7.In the detection process, pass through
Voltage signal is introduced the letter of electric energy quality test instrument by the clamping connection voltage tester line on the voltage circuit terminal lead of each test point
Number interface Ua, Ub, Uc and Un are drawn current signal by mounting current clamp on the current transformer terminal lead of each test point
Enter signaling interface Ia, Ib, Ic of electric energy quality test instrument.
In general, in order to reduce influence of the active power fluctuation for reactive power adjustment output, testing conditions are determined in wind
Electric field wind regime is smaller, under blower standby mode, so as to the output capacity by adjusting reactive power compensation device, to detect survey
The voltage and reactive power of pilot.After connecting detection device according to the above-mentioned mode of connection, detailed process is as follows:
Firstly, the control model of adjustment reactive power compensation device is permanent Reactive Power Control mode on the spot, and record just
Data when beginning to detect, such as the reactive power value of reactive power compensation device output, the voltage value of each bus and its idle function
Rate value；
Secondly, being that a step-length adjusts reactive power with 2Mvar to avoid reactive power adjusting is too fast from voltage out-of-limit occur
The output capacity of compensation device, and record the voltage value and reactive power value of test point after adjustment operation every time.
It should be noted that can be adjusted after needing system stable operation 5min after adjustment every time next time.Work as voltage
When value is close to upper and lower limit, stop further adjustment.Simultaneously because on the spot there is wind power plant in permanent Reactive Power Control mode
Therefore pressure and under-voltage risk to guarantee stably operating wind power field, also need to be adjusted referring to wind power plant Voltage.
That is, each busbar voltage need to control in defined range of operation.Wherein, 220kV bus range of operation is 225.84kV
~232.93kV, 35kV busbar voltage range of operation are 36.81kV~35.4kV.
For example, according to the static capacity of short circuit 750MVA of 220kV bus and 220kV voltage range of operation
225.84kV~232.93kV, be calculated the output capacity of reactive power compensation device adjustable range be 8.94Mvar~-
14.15Mvar.Busbar short-circuit capacity can be less than the case where scheduling calculated result when in view of wind power plant actual motion, have certain
Voltage run surplus, take output capacity adjustable range be -10Mvar~8Mvar.It so, is exactly in adjustable range-
10Mvar~8Mvar and adjusting step 2Mvar are adjusted the output capacity of reactive power compensation device.
After recording process to be adjusted, the output for still adjusting reactive power compensation device with 2Mvar for a step-length is extensive
It is multiple to initial detecting when numerical value, and by control model by permanent Reactive Power Control mode adjustment on the spot to automatism voltage control
(Automatic Voltage Control, AVC) mode, to complete detection process.
Finally, being calculated according to the data detected.Specifically, for example, the detection data obtained is as follows: 220kV is female
The U of test point on line0Value is 229.7kV, and the U0 value of test point is 36.06kV on 35kV bus.Usually choose two adjustment models
Voltage value when enclosing larger and corresponding reactive power value, the U of test point on 220kV bus1For 229.73kV, corresponding reactive power
Q1For 2.33Mvar；U2For 231.4kV, corresponding reactive power Q2For 18.14Mvar.The U of test point on 35kV bus1For
36.07kV corresponding reactive power Q1For 2.344Mvar；U2For 37.03kV, corresponding reactive power Q2For 20.93Mvar.As a result,
Known U1And U2△ U, Q can be obtained1And Q2△ Q can be obtained, above-mentioned data are substituted into previously described formula (1), 220kV bus is calculated
Capacity of short circuit is 2269.72MVA, and 35kV busbar short-circuit capacity is 698.14MVA.
Further, the result of busbar short-circuit capacity obtained above can be verified.To verify 35kV busbar short-circuit
Specific as follows for capacity: Fig. 8 is wind power plant primary system in the application scenarios of busbar short-circuit capacity test method shown in Fig. 2
Rough schematic view can calculate to obtain system impedance according to Fig. 8.It is assumed that capacity of short circuit is at known 220kV bus grid entry point
2269.72MVA, the parameter of wind power plant main transformer, reference capacity choose SB=100MVA, reference voltage are equal to average specified
Voltage, i.e. 220kV system reference voltage UB1=230kV, 35kV system reference voltage UB2=37kV, according to calculating benchmark impedance
Formula (5), the formula (6) of computing system impedance per unit value, the formula (7) for calculating main transformer impedance per unit value and the calculating main transformer pressure of value
The formula (8) of device secondary circuit short-circuit capacity calculates main transformer secondary circuit short-circuit capacity:
Wherein, XB2For transformer reference impedance value, UB2For 35kV system reference voltage value, SBFor transformer reference capacity,
XSC*For system impedance per unit value, XSCFor the famous value of system impedance, XBFor system impedance a reference value, SSCFor 220kV bus grid entry point
Locate capacity of short circuit, XT*(B)For main transformer impedance per unit value, XT*(N)For transformer nameplate short-circuit impedance per unit value, UTNFor transformation
Device voltage rating, STNFor transformer rated capacity, UBFor transformer voltage a reference value, UB1For 220kV system reference voltage value,
XB2For 35kV reference impedance value.
It should be noted that in above-mentioned formula (6), due to system impedance XSCRefer to the system impedance of the side 220kV, therefore,
The reference voltage i.e. U of the side 220kV is taken in approximate calculationB1, rather than UB2。
Calculated main transformer secondary circuit short-circuit capacity is 704.22MVA as a result, and main transformer secondary side is 35kV
The aforementioned 35kV busbar short-circuit capacity 698.14MVA tested out with the embodiment of the present invention is calculated bus bar side with above-mentioned
704.22MVA compare, as a result very close to.As it can be seen that the busbar short-circuit capacity test method of the embodiment of the present invention can be surveyed accurately
Try busbar short-circuit capacity.
Busbar short-circuit capacity test method of the invention, the electricity when reactive power by obtaining test point on bus is zero
Pressure value and at least two groups reactive power value and corresponding voltage value, further according to the reactive power compensation of wind power plant
Voltage value and at least two groups reactive power value and corresponding voltage value when relationship, reactive power are zero, realize standard
Really, busbar short-circuit capacity is dynamically tested, thus to determine that the access system power of wind power plant provides foundation, while being blower
Control parameter adjustment with reactive power compensation device provides reference frame, practical.
Embodiment two
Fig. 9 is the structural schematic diagram of the busbar short-circuit volume test device of the embodiment of the present invention two.It can be used for executing this hair
The busbar short-circuit capacity test method step of bright embodiment one.
Referring to Fig. 9, busbar short-circuit volume test device includes power and voltage obtains module 901 and capacity of short circuit calculates mould
Block 902.
Power and voltage obtain module 901 and are used to obtain the voltage value when reactive power of test point on bus is zero, with
And at least two groups reactive power value and corresponding voltage value.
When capacity of short circuit computing module 902 is for being zero according to reactive power compensation relationship, the reactive power of wind power plant
Voltage value and at least two groups reactive power value and corresponding voltage value, obtain busbar short-circuit capacity.
Specifically, capacity of short circuit computing module 902 can include:
Changing value computing unit (not shown) be used for according at least two groups reactive power value and with its voltage value, calculate
Reactive power changing value and voltage change；
Capacity of short circuit computing unit (not shown) is used for reactive power compensation relationship, reactive power according to wind power plant
Voltage value when changing value and voltage change and reactive power are zero calculates busbar short-circuit capacity.
Preferably, capacity of short circuit computing unit can be used for calculating busbar short-circuit capacity according to the following formula (9):
Wherein, SSCFor busbar short-circuit capacity, U0Voltage value when for reactive power being zero at test point, Δ Q are test point
Locate reactive power changing value, Δ U is voltage change at test point.
Further, wind power plant may include reactive power compensation device, and power and voltage obtain module 901 for passing through tune
The output capacity of whole reactive power compensation device, to detect the voltage value when reactive power of test point on bus is zero, and
At least two groups reactive power value and corresponding voltage value.
Power and voltage, which obtain preset voltage range of operation and static short circuit of the module 901 for obtaining test point, to be held
Amount；According to voltage range of operation and static capacity of short circuit, the adjustable range of output capacity is calculated；Held according to the output being calculated
The adjustable range of amount and preset adjusting step, adjust the output capacity of reactive power compensation device.
Preferably, bus can be specially grid-connected bus and/or current collection line bus rod.
Busbar short-circuit volume test device of the invention, the electricity when reactive power by obtaining test point on bus is zero
Pressure value and at least two groups reactive power value and corresponding voltage value, further according to the reactive power compensation of wind power plant
Voltage value and at least two groups reactive power value and corresponding voltage value when relationship, reactive power are zero, realize standard
Really, busbar short-circuit capacity is dynamically tested, thus to determine that the access system power of wind power plant provides foundation, while being blower
Control parameter adjustment with reactive power compensation device provides reference frame, practical.
Embodiment three
Busbar short-circuit volume test system includes acquisition device and processor.Wherein, acquisition device is for obtaining bus
Voltage value and at least two groups reactive power value and corresponding voltage value when the reactive power of test point is zero.Processing
Voltage value and at least two groups reactive power when device is for being zero according to reactive power compensation relationship, the reactive power of wind power plant
Value and corresponding voltage value, obtain busbar short-circuit capacity.
It should be noted that acquisition device can specifically, but be not limited to electric energy quality test instrument, or other power and
The detection device of voltage.
Busbar short-circuit volume test system of the invention, the electricity when reactive power by obtaining test point on bus is zero
Pressure value and at least two groups reactive power value and corresponding voltage value, further according to the reactive power compensation of wind power plant
Voltage value and at least two groups reactive power value and corresponding voltage when relationship, reactive power are zero, realize it is accurate,
Dynamically test busbar short-circuit capacity, thus to determine that the access system power of wind power plant provides foundation, while for blower with
The control parameter adjustment of reactive power compensation device provides reference frame, practical.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all contain
Lid is within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.
Claims (10)
1. a kind of wind power plant current collection congruence stream busbar short-circuit holds method for determination of amount, which is characterized in that in wind power plant operating status
Under, which comprises
Voltage value and at least two groups reactive power value when the reactive power for obtaining grid-connected bus test point is zero and right with it
The voltage value answered；
Voltage value and described at least two when according to the reactive power compensation relationship of the wind power plant, the reactive power being zero
Group reactive power value and corresponding voltage value, obtain the grid-connected busbar short-circuit capacity；
According to wind power plant primary system structure, it is based on grid-connected busbar short-circuit capacity, current collection is calculated using short-circuit impedance conversion mode
Congruence stream busbar short-circuit capacity.
2. determining method according to claim 1, which is characterized in that the reactive power compensation according to the wind power plant
Voltage value and at least two groups reactive power value and corresponding voltage value when relationship, the reactive power are zero,
Obtaining the busbar short-circuit capacity includes:
According at least two groups reactive power value and with its voltage value, calculate reactive power changing value and voltage change；
According to the reactive power compensation relationship of the wind power plant, the reactive power changing value and voltage change and described
Voltage value when reactive power is zero calculates the grid-connected busbar short-circuit capacity.
3. determining method according to claim 2, which is characterized in that the reactive power compensation according to the wind power plant
Voltage value when relationship, the reactive power changing value and voltage change and the reactive power are zero, calculating are described simultaneously
Net busbar short-circuit capacity includes:
According to
Calculate grid-connected busbar short-circuit capacity, wherein SSCFor grid-connected busbar short-circuit capacity, U0When for reactive power being zero at test point
Voltage value, Δ Q be test point at reactive power changing value, Δ U be test point at voltage change.
4. determining method according to claim 1, which is characterized in that the wind power plant includes reactive power compensation device,
Voltage value and at least two groups reactive power value when the reactive power for obtaining grid-connected bus test point is zero and right with it
The voltage value answered includes:
By adjusting the output capacity of the reactive power compensation device, to detect the reactive power of the grid-connected bus test point
Voltage value and at least two groups reactive power value and corresponding voltage value when being zero.
5. determining method according to claim 4, which is characterized in that described to adjust the defeated of the reactive power compensation device
Capacity includes: out
Obtain the preset voltage range of operation and static capacity of short circuit of the grid-connected bus test point；
According to the voltage range of operation and the static capacity of short circuit, the adjustable range of the output capacity is calculated；
According to the adjustable range for the output capacity being calculated and preset adjusting step, the reactive power compensation device is adjusted
Output capacity.
6. determining method according to claim 1, which is characterized in that it is described according to wind power plant primary system structure, it is based on
Grid-connected busbar short-circuit capacity, converting the step of mode calculates current collection congruence stream busbar short-circuit capacity using short-circuit impedance includes:
According to current collection line bus rod reference voltage value, transformer reference capacity value calculating transformer reference impedance；
According to the famous value of system impedance, system impedance a reference value computing system impedance per unit value；
Transformer nameplate short-circuit impedance per unit value is converted as transformer impedance per unit value；
According to current collection line bus rod reference voltage value, system impedance per unit value and transformer impedance per unit value and, Yi Jibian
Depressor reference impedance calculates current collection congruence stream busbar short-circuit capacity.
7. determining method according to claim 6, which is characterized in that the transformer reference impedance is according to following formula
It calculates:
Wherein, XB2For transformer reference impedance value, UB2For current collection line bus rod reference voltage value, SBFor transformer benchmark appearance
Amount.
8. determining method according to claim 6, which is characterized in that the system impedance per unit value is according to following formula
It calculates:
Wherein,For system impedance per unit value, XSCFor the famous value of system impedance, XBFor system impedance a reference value, SSCIt is grid-connected
Busbar short-circuit capacity, UB1For grid-connected bus reference voltage value, SBFor transformer reference capacity.
9. determining method according to claim 6, which is characterized in that the transformer impedance per unit value is according to following expression
Formula calculates:
Wherein, XT*(B)For transformer impedance per unit value, XT*(N)For transformer nameplate short-circuit impedance per unit value, UTNFor transformer volume
Constant voltage, STNFor transformer rated capacity, UB1For grid-connected bus reference voltage value, SBFor transformer reference capacity.
10. determining method according to claim 6, which is characterized in that the current collection congruence stream busbar short-circuit capacity according to
Following formula calculates:
Wherein, S2For current collection congruence stream busbar short-circuit capacity, UB2For 35kV current collection line bus rod reference voltage value, XSC*To be
System impedance per unit value, XT*(B)For transformer impedance per unit value, XB2For transformer reference impedance value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810829493.8A CN109001573B (en) | 2016-02-15 | 2016-02-15 | Method for determining short-circuit capacity of collector bus of wind power plant |
Applications Claiming Priority (2)
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Cited By (3)
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| CN109672191A (en) * | 2019-01-21 | 2019-04-23 | 华北电力大学 | The screening technique of large-scale wind power field collection region sub-synchronous oscillation risk |
| CN112881822A (en) * | 2021-01-07 | 2021-06-01 | 国网河北省电力有限公司电力科学研究院 | Method and device for detecting voltage control function of wind power plant |
| CN114336595A (en) * | 2021-12-03 | 2022-04-12 | 广东电网有限责任公司汕头供电局 | Capacitor harmonic evaluation method and monitoring device based on actually measured short-circuit capacity |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108183490B (en) * | 2016-12-08 | 2020-11-10 | 北京金风科创风电设备有限公司 | Control gain adjustment method, device and system for reactive compensation device |
| CN110297150B (en) | 2018-03-21 | 2020-10-23 | 北京金风科创风电设备有限公司 | Wind generating set grid-connected point short circuit capacity detection method and device |
| CN109031000B (en) * | 2018-08-03 | 2019-08-16 | 贵州电网有限责任公司电网规划研究中心 | A kind of method and system based on non-faulting disturbance In situ Measurement grid short circuit capacity |
| CN110542822A (en) * | 2019-09-06 | 2019-12-06 | 贵州电网有限责任公司 | method for measuring short-circuit current and short-circuit impedance of power grid based on reactive power disturbance |
| CN112881782A (en) * | 2020-12-30 | 2021-06-01 | 广东电网有限责任公司电力科学研究院 | Single-phase short-circuit current online monitoring method and device for power system |
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| CN114336595A (en) * | 2021-12-03 | 2022-04-12 | 广东电网有限责任公司汕头供电局 | Capacitor harmonic evaluation method and monitoring device based on actually measured short-circuit capacity |
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| CN109001573B (en) | 2021-06-08 |
| CN105548781A (en) | 2016-05-04 |
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