CN108155665A - Low voltage ride through control method and device for wind generating set - Google Patents
Low voltage ride through control method and device for wind generating set Download PDFInfo
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- CN108155665A CN108155665A CN201711475020.4A CN201711475020A CN108155665A CN 108155665 A CN108155665 A CN 108155665A CN 201711475020 A CN201711475020 A CN 201711475020A CN 108155665 A CN108155665 A CN 108155665A
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- 238000012544 monitoring process Methods 0.000 claims abstract description 7
- 230000005611 electricity Effects 0.000 claims description 20
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- 238000009499 grossing Methods 0.000 claims description 8
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- 238000010248 power generation Methods 0.000 description 2
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- H02J3/386—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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Abstract
The embodiment of the invention discloses a low voltage ride through control method and device for a wind generating set. The method comprises the following steps: monitoring the voltage of a grid-connected point of a wind power plant in real time; controlling the wind generating set to execute low voltage ride through and finish low voltage ride through according to the voltage of the grid-connected point and the rated voltage output by the wind generating set; controlling the wind generating set to reduce active current provided to the grid-connected point and increase capacitive reactive current provided to the grid-connected point during the low voltage ride through; and after finishing the low voltage ride through, controlling the wind generating set to provide gradually increased active current for the grid-connected point, and controlling the wind generating set to provide reactive current for the grid-connected point according to the working state of the wind generating set before the low voltage ride through is executed. The wind generating set low voltage ride through control method and device provided by the embodiment of the invention can ensure the voltage recovery of a power grid and can avoid the failure of low voltage ride through.
Description
Technical field
The present invention relates to technical field of wind power generation more particularly to a kind of low voltage traversing control method of wind generator set
And device.
Background technology
Large-scale wind power unit concentrates access to bring many new problems to electric system, and wherein low voltage ride-through capability is
Very important one.Permanent magnet direct-drive wind turbine employs no step-up gear, impeller directly drives multipole low-speed permanent-magnet and synchronizes hair
The variable-speed constant-frequency wind power generation technology of motor, wind turbine is grid-connected by full power convertor, realizes the complete of generator and power grid
Decoupling, the grid-connected characteristic of wind turbine depend primarily on the technical performance of current transformer grid side.
The low voltage ride-through capability of current permanent magnet direct-drive unit is mainly reflected in two aspects：1) the low voltage crossing phase
Between, by being parallel to the brake unit of dc bus, keep active power balance；2) during low voltage crossing, net side current transformer
Network voltage is supported to restore by exporting reactive current.
The existing control strategy for wind-power electricity generation is：Under normal operating condition, current-variable controller is according to wind-power electricity generation
The instruction of the master controller of unit provides reactive current to power grid.Work as grid collapses, when performing low voltage crossing, main control
The instruction of device is cut off, and current-variable controller directly sends nothing according to the degree of falling of the set end voltage of wind power generating set to power grid
Work(electric current, to help to restore network voltage.When failure is eliminated, the reactive current instantaneous variation of current-variable controller output is extremely
Zero.
Therefore, in the prior art, wind power plant participates in the REACTIVE POWER/VOLTAGE tune of grid entry point by the idle output of Wind turbines
Section, only requires the idle control of the transient state during low voltage crossing, and the idle control that stable state is switched to from transient state is not wanted
The problem of asking, low voltage crossing failure may be will appear in practical operational process.
Invention content
The embodiment of the present invention provides a kind of low voltage traversing control method of wind generator set and device, can be in low-voltage
After passing through, the reactive power provided wind power generating set is rationally controlled, and ensures that network voltage restores, and can
Low voltage crossing is avoided to fail.
On the one hand, an embodiment of the present invention provides a kind of low voltage traversing control method, this method includes：
Wind farm grid-connected voltage is monitored in real time；
According to the rated voltage that grid entry point voltage and wind power generating set export, control wind power generating set performs low electricity
It presses to wear more and terminates low voltage crossing；Wherein,
During low voltage crossing is performed, control wind power generating set reduce the watt current that provides to grid entry point and
The capacitive reactive power electric current provided to grid entry point is provided；
After low voltage crossing is terminated, control wind power generating set provides gradually increased watt current to grid entry point,
And the working condition according to wind power generating set before low voltage crossing is performed, control wind power generating set are carried to grid entry point
For reactive current.
In one embodiment of the invention, the work shape according to wind power generating set before low voltage crossing is performed
State, control wind power generating set provide reactive current to grid entry point, including：
In wind power generating set in the case where the forward direction grid entry point for performing low voltage crossing provides zero reactive power, control
Wind power generating set provides zero reactive current to grid entry point；
In wind power generating set in the case where the forward direction grid entry point for performing low voltage crossing provides capacitive reactive power, control
Wind power generating set processed provides gradually increased capacitive reactive power electric current to grid entry point；
In wind power generating set in the case where the forward direction grid entry point for performing low voltage crossing provides lagging reactive power, control
Inductive reactive power current value of the wind power generating set processed before grid entry point offer Spline smoothing to low voltage crossing, alternatively, control
Wind power generating set provides gradually increased inductive reactive power electric current to grid entry point.
In one embodiment of the invention, control wind power generating set provides gradually increased capacitive reactive power to grid entry point
Electric current, including：
According to the power-factor angle before the increase rate and low voltage crossing of the active power of wind power generating set, really
The increase rate of constant volume reactive current；
According to the increase rate of capacitive reactive power electric current, control wind power generating set provides gradually increased capacitive to grid entry point
Reactive current.
In one embodiment of the invention, the capacitive reactive power electric current provided to grid entry point is provided, including：
According to the grid entry point voltage before voltage sag type, low voltage crossing, the grid entry point voltage during low voltage crossing,
The rated current and rated voltage of wind power generating set output, determine the capacitive reactive power electric current for needing to provide；
To capacitive reactive power electric current determined by grid entry point offer.
On the other hand, an embodiment of the present invention provides a kind of low-voltage crossing controller of wind generating set, the devices
Including：
Monitoring modular, for monitoring wind farm grid-connected voltage in real time；
First control module for the rated voltage according to grid entry point voltage and wind power generating set output, controls wind
Power generator group performs low voltage crossing and terminates low voltage crossing；
Second control module carries for during low voltage crossing is performed, control wind power generating set to reduce to grid entry point
The watt current of confession and increase the capacitive reactive power electric current provided to grid entry point；
Third control module, for after low voltage crossing is terminated, control wind power generating set to grid entry point provide by
Gradually increased watt current and the working condition according to wind power generating set before low voltage crossing is performed control wind-force
Generating set provides reactive current to grid entry point.
In one embodiment of the invention, the work shape according to wind power generating set before low voltage crossing is performed
State, control wind power generating set provide reactive current to grid entry point, including：
In wind power generating set in the case where the forward direction grid entry point for performing low voltage crossing provides zero reactive power, control
Wind power generating set provides zero reactive current to grid entry point；
In wind power generating set in the case where the forward direction grid entry point for performing low voltage crossing provides capacitive reactive power, control
Wind power generating set processed provides gradually increased capacitive reactive power electric current to grid entry point；
In wind power generating set in the case where the forward direction grid entry point for performing low voltage crossing provides lagging reactive power, control
Inductive reactive power current value of the wind power generating set processed before grid entry point offer Spline smoothing to low voltage crossing, alternatively, control
Wind power generating set provides gradually increased inductive reactive power electric current to grid entry point.
In one embodiment of the invention, control wind power generating set provides gradually increased capacitive reactive power to grid entry point
Electric current, including：
According to the power-factor angle before the increase rate and low voltage crossing of the active power of wind power generating set, really
The increase rate of constant volume reactive current；
According to the increase rate of capacitive reactive power electric current, control wind power generating set provides gradually increased capacitive to grid entry point
Reactive current.
In one embodiment of the invention, the capacitive reactive power electric current provided to grid entry point is provided, including：
According to the grid entry point voltage before voltage sag type, low voltage crossing, the grid entry point voltage during low voltage crossing,
The rated current and rated voltage of wind power generating set output, determine the capacitive reactive power electric current for needing to provide；
To capacitive reactive power electric current determined by grid entry point offer.
The low voltage traversing control method of wind generator set and device of the embodiment of the present invention, by according to wind-driven generator
Working condition of the group before low voltage crossing is performed, control wind power generating set provide reactive current, Neng Gou to grid entry point
After low voltage crossing, the reactive power provided wind power generating set is rationally controlled, and ensures that network voltage restores.This
Control that transient state of the embodiment of invention during low voltage crossing is idle, and be switched to after low voltage crossing from transient state
The idle control of stable state provides detailed technology requirement, therefore low voltage crossing can be avoided to fail.
Description of the drawings
In order to illustrate the technical solution of the embodiments of the present invention more clearly, it will make below to required in the embodiment of the present invention
Attached drawing is briefly described, for those of ordinary skill in the art, without creative efforts, also
Other attached drawings can be obtained according to these attached drawings.
Fig. 1 shows the flow signal of low voltage traversing control method of wind generator set provided in an embodiment of the present invention
Figure；
Fig. 2 shows wind power generating sets provided in an embodiment of the present invention to send out zero reactive power situation before low voltage crossing
The change schematic diagram of lower watt current and reactive current；
Fig. 3 shows that wind power generating set provided in an embodiment of the present invention sends out capacitive reactive power feelings before low voltage crossing
The first of watt current and reactive current change schematic diagram under condition；
Fig. 4 shows that wind power generating set provided in an embodiment of the present invention sends out capacitive reactive power feelings before low voltage crossing
Second of change schematic diagram of watt current and reactive current under condition；
Fig. 5 shows that wind power generating set provided in an embodiment of the present invention sends out lagging reactive power feelings before low voltage crossing
The first of watt current and reactive current change schematic diagram under condition；
Fig. 6 shows that wind power generating set provided in an embodiment of the present invention sends out lagging reactive power feelings before low voltage crossing
Second of change schematic diagram of watt current and reactive current under condition；
Fig. 7 shows that wind power generating set provided in an embodiment of the present invention sends out the imitative of zero reactive power before low voltage crossing
True schematic diagram；
Fig. 8 show wind power generating set provided in an embodiment of the present invention sent out before low voltage crossing 500 kilovars capacitives without
The emulation schematic diagram of work(power；
Fig. 9 shows that wind power generating set provided in an embodiment of the present invention sends out 500 kilovars perceptual nothings before low voltage crossing
The emulation schematic diagram of work(power；
Figure 10 shows the structural representation of low-voltage crossing controller of wind generating set provided in an embodiment of the present invention
Figure.
Specific embodiment
The feature and exemplary embodiment of various aspects of the invention is described more fully below, in order to make the mesh of the present invention
, technical solution and advantage be more clearly understood, with reference to the accompanying drawings and embodiments, the present invention is further retouched in detail
It states.It should be understood that specific embodiment described herein is only configured to explain the present invention, it is not configured as limiting the present invention.
To those skilled in the art, the present invention can be real in the case of some details in not needing to these details
It applies.The description of embodiment is used for the purpose of by showing that the example of the present invention is better understood from the present invention to provide below.
It should be noted that herein, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any this practical relationship or sequence.Moreover, term " comprising ", "comprising" or its any other variant are intended to
Non-exclusive inclusion, so that process, method, article or equipment including a series of elements not only will including those
Element, but also including other elements that are not explicitly listed or further include as this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence " including ... ", it is not excluded that including
Also there are other identical elements in the process of the element, method, article or equipment.
Fig. 1 shows the flow signal of low voltage traversing control method of wind generator set provided in an embodiment of the present invention
Figure.Low voltage traversing control method of wind generator set can include：
S101：Wind farm grid-connected voltage is monitored in real time.
S102：According to the rated voltage that grid entry point voltage and wind power generating set export, control wind power generating set is held
Row low voltage crossing and end low voltage crossing.Wherein, during wind power generating set performs low voltage crossing, S103 is performed,
After wind power generating set terminates low voltage crossing, S104 is performed.
S103：Control wind power generating set reduces the watt current provided to grid entry point and increases to grid entry point offer
Capacitive reactive power electric current.
S104：Wind power generating set is controlled to provide gradually increased watt current and according to wind-power electricity generation to grid entry point
Working condition of the unit before low voltage crossing is performed, control wind power generating set provide reactive current to grid entry point.
Illustratively, wind farm grid-connected voltage is monitored in real time, and voltage is extracted from the grid entry point voltage real-time monitored
Positive-sequence component, if the positive-sequence component of the voltage extracted less than 0.9 times wind power generating set export rated voltage, and
Continue 40 milliseconds (ms), then wind power generating set is controlled to perform low voltage crossing.
During low voltage crossing, control wind power generating set reduces the watt current provided to grid entry point and increase
The capacitive reactive power electric current provided to grid entry point；And extracting voltage just from the grid entry point voltage obtained during low voltage crossing
Order components according to the rated voltage that the positive-sequence component of the voltage currently extracted and wind power generating set export, determine that wind-force is sent out
Whether motor group terminates low voltage crossing.
Illustratively, it is assumed that the positive-sequence component of the grid entry point voltage during the low voltage crossing extracted is more than 0.9 times
The rated voltage of wind power generating set output, and continue 50ms, then wind power generating set is controlled to terminate low voltage crossing.
After low voltage crossing, control wind power generating set provides gradually increased watt current to grid entry point, with
And the working condition according to wind power generating set before low voltage crossing is performed, control wind power generating set are provided to grid entry point
Reactive current.
It is for the control strategy of wind-power electricity generation in the prior art, when low voltage crossing failure is eliminated, wind-power electricity generation
The reactive current moment of unit current-variable controller output drops to zero, does not consider the wind-power electricity generation before low voltage crossing occurs
The working condition of unit.There are following drawbacks for this scheme that inventor has found in long-term engineering practice.
If wind power generating set sends out lagging reactive power before low voltage crossing, then after low voltage crossing,
Reactive power will be caused superfluous, be unfavorable for network voltage recovery.In addition, after low voltage crossing, active power is extensive rapidly
Multiple, at this time if wind power generating set current-variable controller does not send out lagging reactive power in time, network voltage will increase, and having can
Wind power generating set can be caused to perform high voltage crossing, low voltage crossing is caused to fail.
If wind power generating set sends out capacitive reactive power before low voltage crossing, then after low voltage crossing,
Reactive power will be caused insufficient, be also unfavorable for network voltage recovery.In addition, after low voltage crossing, active power is rapid
Restore, at this time if current-variable controller does not send out capacitive reactive power in time, network voltage will reduce, it is possible to lead to wind-force
Generating set performs low voltage crossing again, it is possible to low voltage crossing be caused to fail.
Therefore, the embodiment of the present invention is worn after low voltage crossing is terminated based on wind power generating set in execution low-voltage
Working condition before more provides following several solutions.
Scheme one：The situation of zero reactive power is provided in wind power generating set in the forward direction grid entry point for performing low voltage crossing
Under, control wind power generating set provides zero reactive current to grid entry point.
Scheme two：The feelings of capacitive reactive power are provided in wind power generating set in the forward direction grid entry point for performing low voltage crossing
Under condition, control wind power generating set provides gradually increased capacitive reactive power electric current to grid entry point.
Scheme three：The feelings of lagging reactive power are provided in wind power generating set in the forward direction grid entry point for performing low voltage crossing
Under condition, control wind power generating set provides gradually increased inductive reactive power electric current to grid entry point.
Scheme four：The feelings of lagging reactive power are provided in wind power generating set in the forward direction grid entry point for performing low voltage crossing
Under condition, inductive reactive power current value of the control wind power generating set before grid entry point offer Spline smoothing to low voltage crossing.
Corresponding said program one, Fig. 2 shows wind power generating set provided in an embodiment of the present invention before low voltage crossing
Send out the change schematic diagram of watt current and reactive current under zero reactive power situation.
The t1 moment starts to perform low voltage crossing, and wind power generating set provides capacitive reactive power electric current to grid entry point, to improve
Grid entry point voltage；T2 moment, low voltage crossing terminate, and reactive current instantaneous variation to zero, reactive power reverts to zero, wattful power
Rate starts to restore；T3 moment, watt current restore the watt current to low voltage crossing, at this point, active power is restored to low
Active power before voltage ride-through, power grid operation.
Corresponding said program two, Fig. 3 show wind power generating set provided in an embodiment of the present invention before low voltage crossing
The first of watt current and reactive current change schematic diagram in the case of hair capacitive reactive power；Fig. 4 shows implementation of the present invention
The wind power generating set that example provides sends out the of capacitive reactive power watt current and reactive current before low voltage crossing
Two kinds of change schematic diagrams.
In Fig. 3, the t1 moment starts to perform low voltage crossing, and wind power generating set provides capacitive reactive power electric current to grid entry point,
To improve grid entry point voltage；T2 moment, low voltage crossing terminate, reactive current instantaneous variation to zero, and reactive power zero is idle
Electric current and watt current start to restore, i.e., reactive power and active power start to restore；T3 moment, watt current are restored to low electricity
More preceding watt current is pressed to wear, reactive current restores the reactive current to low voltage crossing, at this point, active power is restored to low
Active power before voltage ride-through, reactive power restore the capacitive reactive power to low voltage crossing.Power grid operation.
In Fig. 4, the t1 moment starts to perform low voltage crossing, and wind power generating set provides capacitive reactive power electric current to grid entry point,
To improve grid entry point voltage；T2 moment, low voltage crossing terminate, and reactive current moment is not changed to zero, reactive current and active
Electric current starts to restore, i.e., reactive power and active power start to restore；T3 moment, watt current are restored to low voltage crossing
Watt current, reactive current restores the reactive current to low voltage crossing, at this point, active power is restored to low voltage crossing
Active power, reactive power restores the capacitive reactive power to low voltage crossing.Power grid operation.
In one embodiment of the invention, low voltage crossing can be set to terminate, reactive current moment is not changed to zero
When, the value of reactive current, such as setting low voltage crossing at the end of, reactive current instantaneous variation isWherein, Ip is
Watt current during low voltage crossing,For the power-factor angle before low voltage crossing.
In one embodiment of the invention, control wind power generating set provides gradually increased capacitive reactive power to grid entry point
Electric current can include：According to the power factor before the increase rate and low voltage crossing of the active power of wind power generating set
Angle determines the increase rate of capacitive reactive power electric current；According to the increase rate of capacitive reactive power electric current, control wind power generating set is to simultaneously
Site provides gradually increased capacitive reactive power electric current.
Illustratively, it is assumed that the increase rate of the active power of wind power generating set is per second for Pn, before low voltage crossing
Power-factor angle isThe regeneration rate for then determining reactive power isIt is per second.Wherein, Pn is wind power generating set
Rated power.And then according to the regeneration rate of reactive power determined, determine the increase rate of capacitive reactive power electric current；Root
According to the increase rate of capacitive reactive power electric current, control wind power generating set provides gradually increased capacitive reactive power electric current to grid entry point.
In one embodiment of the invention, the increase rate of the active power of wind power generating set can be set at
30%Pn it is per second to 10Pn it is per second between, correspondingly, the increase rate of reactive power existsIt is per second extremelyBetween per second.
Corresponding said program three, Fig. 5 show wind power generating set provided in an embodiment of the present invention before low voltage crossing
The first of watt current and reactive current change schematic diagram in the case of hair lagging reactive power.
The t1 moment starts to perform low voltage crossing, and wind power generating set provides capacitive reactive power electric current to grid entry point, to improve
Grid entry point voltage；T2 moment, low voltage crossing terminate, reactive current instantaneous variation to zero, reactive power zero, reactive current and
Watt current starts to restore, i.e., reactive power and active power start to restore；T3 moment, watt current are restored to low voltage crossing
Preceding watt current, reactive current restore the inductive reactive power electric current to low voltage crossing, at this point, active power is restored to low electricity
More preceding active power is pressed to wear, reactive power restores the lagging reactive power to low voltage crossing.Power grid operation.
Corresponding said program four, Fig. 6 show wind power generating set provided in an embodiment of the present invention before low voltage crossing
Second of change schematic diagram of watt current and reactive current in the case of hair lagging reactive power.
The t1 moment starts to perform low voltage crossing, and wind power generating set provides capacitive reactive power electric current to grid entry point, to improve
Grid entry point voltage；T2 moment, low voltage crossing terminate, and watt current starts to restore, i.e., active power starts to restore, wind-power electricity generation
Inductive reactive power current value of the unit before the reactive current moment step to low voltage crossing that grid entry point provides；It is the t3 moment, active
Electric current restores the watt current to low voltage crossing, at this point, active power restores the active power to low voltage crossing.Electricity
Net stable operation.
The reason of t2 moment reactive current Spline smoothings, is illustrated at this.
Since wind power generating set can send reactive power while active power is sent, reactive power can cause grid-connected
Point voltage reduces；The active power of transmission is more, caused by lagging reactive power can be more, caused by voltage landing can be more.
If wind power generating set is before low voltage crossing, wind power generating set hair lagging reactive power, in low voltage crossing
After, if the active power of wind power generating set is restored according to slope, if reactive power is started from scratch, can cause to lack
Lagging reactive power, so as to which grid entry point voltage be caused to increase.
Therefore, in the example of fig. 6, the numerical value before t2 moment reactive currents Spline smoothing to low voltage crossing, with timely
The lagging reactive power lacked in top-up system prevents wind power generating set from entering height and wears state.
In one embodiment of the invention, the capacitive reactive power electric current provided to grid entry point is provided, can be included：According to electricity
Press the grid entry point voltage before dip type, low voltage crossing, the grid entry point voltage during low voltage crossing, wind power generating set defeated
The rated current and rated voltage gone out determines the capacitive reactive power electric current for needing to provide；To capacitive determined by grid entry point offer
Reactive current.
If voltage sag type passes through expression symmetrically to fall according to voltage change during low voltage crossing
(1), reactive current Ir is calculated.
Wherein, K is reactive-current compensation coefficient, and U0 is the positive-sequence component of grid entry point voltage before low voltage crossing, and U1 is low
The positive-sequence component of grid entry point voltage during voltage ride-through, In are the rated current of wind power generating set output, and Un is wind-power electricity generation
The rated voltage of unit output.
According to the reactive current Ir calculated, before low voltage crossing the reactive current of grid entry point positive-sequence component I0 and wind
The rated current In of power generator group output, determines the reactive current Iq for needing to provide to grid entry point.
In one embodiment of the invention, when determining the reactive current Iq that needs are provided to grid entry point, I0+Ir and Ir are taken
In maximum value be compared with In.
If the maximum value in I0+Ir and Ir is more than In, it is In to need the reactive current Iq provided to grid entry point.
If maximum value in I0+Ir and Ir no more than In, need to the reactive current Iq that grid entry point provides for I0+Ir with
Maximum value in Ir.
If voltage sag type falls for asymmetry, reactive current Ir is calculated according to above-mentioned expression formula (1).
In the reactive current Iq for determining to need to provide to grid entry point, take maximum value in I0+Ir and Ir and 40%In into
Row compares.
If the maximum value in I0+Ir and Ir is more than 40%In, it is 40% to need the reactive current Iq provided to grid entry point
In。
If for the maximum value in I0+Ir and Ir no more than 40%In, it is I0+ to need the reactive current Iq provided to grid entry point
Maximum value in Ir and Ir.
The low voltage traversing control method of wind generator set of the embodiment of the present invention, by being held according to wind power generating set
Working condition before row low voltage crossing, control wind power generating set provide reactive current to grid entry point, can be in low-voltage
After passing through, the reactive power provided wind power generating set is rationally controlled, and ensures that network voltage restores, and can
Low voltage crossing is avoided to fail.
In one embodiment of the invention, the low voltage traversing control method of wind generator set of the embodiment of the present invention is also
It can include：During low voltage crossing is performed, according to grid entry point voltage, the grid entry point Voltage Drop width during low voltage crossing
Value and preset duration corresponding with grid entry point Voltage Drop amplitude determine that wind power generating set performs whether low voltage crossing is sent out
Raw time out fault；If it is determined that wind power generating set, which performs low voltage crossing, occurs time out fault, then low voltage crossing time-out is exported
The warning message of failure.
Illustratively, it is assumed that grid entry point Voltage Drop amplitude and preset duration correspondence, as shown in table 1.
Table 1
| Grid entry point Voltage Drop amplitude (pu) | Preset duration (millisecond) |
| 0.9±0.02 | 120000±20 |
| 0.85±0.02 | 3000±20 |
| 0.75±0.02 | 2670±20 |
| 0.5±0.02 | 1850±20 |
| 0.35±0.02 | 1350±20 |
| 0.2±0.02 | 860±20 |
| 0±0.02 | 500±20 |
Illustratively, it is assumed that the positive-sequence component of the grid entry point voltage during the low voltage crossing extracted is 0.86 times of volume
Constant voltage, i.e. perunit value are 0.86, and duration is 3000 milliseconds, it is determined that go out wind power generating set and perform low voltage crossing
Time out fault occurs；The warning message of low voltage crossing time out fault is exported at this time.
Fig. 7 shows that wind power generating set provided in an embodiment of the present invention sends out the imitative of zero reactive power before low voltage crossing
True schematic diagram.
As seen from Figure 7, during low voltage crossing, reactive current is preferential, and residual capacity electric current all sends out watt current；
Reactive current is dealt into 1 perunit value (pu).
Fig. 8 show wind power generating set provided in an embodiment of the present invention sent out before low voltage crossing 500 kilovars capacitives without
The emulation schematic diagram of work(power.
As seen from Figure 8, during low voltage crossing, reactive current is preferential, and residual capacity electric current all sends out watt current；
During low voltage crossing, if the maximum value in I0+Ir and Ir, not less than 1pu, reactive current Iq takes 1pu, if in I0+Ir and Ir
Maximum value be less than 1pu, then reactive current Iq take the maximum value in I0+Ir and Ir；Reactive current is dealt into 1pu；Low voltage crossing
After, reactive power is promptly restored to 500 kilovars (kvar).
Fig. 9 shows that wind power generating set provided in an embodiment of the present invention sends out 500 kilovars perceptual nothings before low voltage crossing
The emulation schematic diagram of work(power.
As seen from Figure 9, during low voltage crossing, reactive current is preferential, and residual capacity electric current all sends out watt current；
During low voltage crossing, since reactive current I0 is negative, I0+Ir at this time before low voltage crossing<Ir, if Ir is not less than 1pu, nothing
Work(electric current Iq takes 1pu, if Ir is less than 1pu, reactive current Iq takes Ir, and reactive current is dealt into 1pu；After low voltage crossing, nothing
Work(power is promptly restored to -500kvar.
The low voltage traversing control method of wind generator set of the embodiment of the present invention, additionally it is possible to determine wind power generating set
It performs whether low voltage crossing occurs time out fault, and when time out fault occurs, low voltage crossing time-out event can be exported
The warning message of barrier so that user can safeguard wind power generating set according to warning message.
Corresponding with above-mentioned embodiment of the method, the embodiment of the present invention also provides a kind of low voltage cross-over of wind generator set
Control device.
Figure 10 shows the structural representation of low-voltage crossing controller of wind generating set provided in an embodiment of the present invention
Figure.Low-voltage crossing controller of wind generating set can include：
Monitoring modular 101, for monitoring wind farm grid-connected voltage in real time.
First control module 102, for the rated voltage according to grid entry point voltage and wind power generating set output, control
Wind power generating set performs low voltage crossing and terminates low voltage crossing.
Second control module 103, for during low voltage crossing is performed, control wind power generating set to reduce to grid entry point
The watt current of offer and increase the capacitive reactive power electric current provided to grid entry point.
Third control module 104, for after low voltage crossing is terminated, control wind power generating set to be provided to grid entry point
Gradual increased watt current and the working condition according to wind power generating set before low voltage crossing is performed, control wind
Power generator group provides reactive current to grid entry point.
In one embodiment of the invention, the work shape according to wind power generating set before low voltage crossing is performed
State, control wind power generating set provide reactive current to grid entry point, including：
In wind power generating set in the case where the forward direction grid entry point for performing low voltage crossing provides zero reactive power, control
Wind power generating set provides zero reactive current to grid entry point；
In wind power generating set in the case where the forward direction grid entry point for performing low voltage crossing provides capacitive reactive power, control
Wind power generating set processed provides gradually increased capacitive reactive power electric current to grid entry point；
In wind power generating set in the case where the forward direction grid entry point for performing low voltage crossing provides lagging reactive power, control
Inductive reactive power current value of the wind power generating set processed before grid entry point offer Spline smoothing to low voltage crossing, alternatively, control
Wind power generating set provides gradually increased inductive reactive power electric current to grid entry point.
In one embodiment of the invention, control wind power generating set provides gradually increased capacitive reactive power to grid entry point
Electric current, including：
According to the power-factor angle before the increase rate and low voltage crossing of the active power of wind power generating set, really
The increase rate of constant volume reactive current；
According to the increase rate of capacitive reactive power electric current, control wind power generating set provides gradually increased capacitive to grid entry point
Reactive current.
In one embodiment of the invention, the capacitive reactive power electric current provided to grid entry point is provided, including：
According to the grid entry point voltage before voltage sag type, low voltage crossing, the grid entry point voltage during low voltage crossing,
The rated current and rated voltage of wind power generating set output, determine the capacitive reactive power electric current for needing to provide；
To capacitive reactive power electric current determined by grid entry point offer.
In one embodiment of the invention, the low-voltage crossing controller of wind generating set of the embodiment of the present invention is also
It can include：
Determining module, for during low voltage crossing is performed, according to the grid entry point voltage, grid-connected during low voltage crossing
Point Voltage Drop amplitude and preset duration corresponding with grid entry point Voltage Drop amplitude determine that wind power generating set performs low electricity
It presses to wear and more whether time out fault occurs.
Output module, for if it is determined that wind power generating set execution low voltage crossing generation time out fault, then export low electricity
Press to wear the warning message of more time out fault.
The low-voltage crossing controller of the embodiment of the present invention, by performing low voltage crossing according to wind power generating set
Working condition before, control wind power generating set provide reactive current to grid entry point, can be right after low voltage crossing
The reactive power that wind power generating set provides rationally is controlled, and ensures that network voltage restores, and low-voltage can be avoided to wear
More fail.And it is capable of determining that wind power generating set performs whether low voltage crossing breaks down, and when breaking down,
The warning message of low voltage crossing failure can be exported so that user can carry out wind power generating set according to warning message
It safeguards.
It should be clear that the invention is not limited in specific configuration described above and shown in figure and processing.
For brevity, it is omitted here the detailed description to known method.In the above-described embodiments, several tools have been described and illustrated
The step of body, is as example.But procedure of the invention is not limited to described and illustrated specific steps, this field
Technical staff can be variously modified, modification and addition or suitable between changing the step after the spirit for understanding the present invention
Sequence.
It should also be noted that, the exemplary embodiment referred in the present invention, is retouched based on a series of step or device
State certain methods or system.But the present invention is not limited to the sequence of above-mentioned steps, that is to say, that can be according in embodiment
The sequence referred to performs step, may also be distinct from that the sequence in embodiment or several steps are performed simultaneously.
The above description is merely a specific embodiment, it is apparent to those skilled in the art that,
For convenience of description and succinctly, the specific work process of the system of foregoing description, module and unit can refer to preceding method
Corresponding process in embodiment, details are not described herein.It should be understood that protection scope of the present invention is not limited thereto, it is any to be familiar with
Those skilled in the art in the technical scope disclosed by the present invention, can readily occur in various equivalent modifications or substitutions,
These modifications or substitutions should be covered by the protection scope of the present invention.
Claims (8)
1. a kind of low voltage traversing control method of wind generator set, which is characterized in that the method includes：
Wind farm grid-connected voltage is monitored in real time；
According to the rated voltage that the grid entry point voltage and wind power generating set export, the wind power generating set is controlled to perform
Low voltage crossing and end low voltage crossing；Wherein,
During low voltage crossing is performed, the wind power generating set is controlled to reduce the watt current provided to the grid entry point,
And increase the capacitive reactive power electric current provided to the grid entry point；
After low voltage crossing is terminated, the wind power generating set is controlled to provide gradually increased active electricity to the grid entry point
Stream and the working condition according to the wind power generating set before low voltage crossing is performed, control the wind-driven generator
Group provides reactive current to the grid entry point.
2. according to the method described in claim 1, it is characterized in that, described performing low-voltage according to the wind power generating set
Working condition before passing through controls the wind power generating set to provide reactive current to grid entry point, including：
In the wind power generating set in the case where grid entry point provides zero reactive power described in the forward direction for performing low voltage crossing,
The wind power generating set is controlled to provide zero reactive current to the grid entry point；
In the wind power generating set situation of capacitive reactive power is provided in grid entry point described in the forward direction for performing low voltage crossing
Under, the wind power generating set is controlled to provide gradually increased capacitive reactive power electric current to the grid entry point；
In the wind power generating set situation of lagging reactive power is provided in grid entry point described in the forward direction for performing low voltage crossing
Under, inductive reactive power electric current of the wind power generating set before grid entry point offer Spline smoothing to low voltage crossing is provided
Value, alternatively, the wind power generating set is controlled to provide gradually increased inductive reactive power electric current to the grid entry point.
3. according to the method described in claim 2, it is characterized in that, described control the wind power generating set to the grid entry point
Gradually increased capacitive reactive power electric current is provided, including：
According to the power-factor angle before the increase rate and low voltage crossing of the active power of the wind power generating set, really
The increase rate of the fixed capacitive reactive power electric current；
According to the increase rate of the capacitive reactive power electric current, the wind power generating set is controlled to be provided to the grid entry point and is gradually increased
Big capacitive reactive power electric current.
4. according to the method described in claim 1, it is characterized in that, described increase the capacitive reactive power electricity provided to the grid entry point
Stream, including：
According to the grid entry point voltage before voltage sag type, the low voltage crossing, the grid entry point during the low voltage crossing
Voltage, the rated current of wind power generating set output and the rated voltage, determine the capacitive reactive power for needing to provide electricity
Stream；
To capacitive reactive power electric current determined by grid entry point offer.
5. a kind of low-voltage crossing controller of wind generating set, which is characterized in that described device includes：
Monitoring modular, for monitoring wind farm grid-connected voltage in real time；
First control module for the rated voltage according to the grid entry point voltage and wind power generating set output, controls institute
Wind power generating set is stated to perform low voltage crossing and terminate low voltage crossing；
Second control module, for during low voltage crossing is performed, the wind power generating set being controlled to reduce to described grid-connected
The watt current and the capacitive reactive power electric current provided to the grid entry point is provided that point provides；
Third control module, for after low voltage crossing is terminated, the wind power generating set being controlled to be carried to the grid entry point
Working condition for gradual increased watt current and according to the wind power generating set before low voltage crossing is performed,
The wind power generating set is controlled to provide reactive current to the grid entry point.
6. device according to claim 5, which is characterized in that described that low-voltage is being performed according to the wind power generating set
Working condition before passing through controls the wind power generating set to provide reactive current to the grid entry point, including：
In the wind power generating set in the case where grid entry point provides zero reactive power described in the forward direction for performing low voltage crossing,
The wind power generating set is controlled to provide zero reactive current to the grid entry point；
In the wind power generating set situation of capacitive reactive power is provided in grid entry point described in the forward direction for performing low voltage crossing
Under, the wind power generating set is controlled to provide gradually increased capacitive reactive power electric current to the grid entry point；
In the wind power generating set situation of lagging reactive power is provided in grid entry point described in the forward direction for performing low voltage crossing
Under, inductive reactive power electric current of the wind power generating set before grid entry point offer Spline smoothing to low voltage crossing is provided
Value, alternatively, the wind power generating set is controlled to provide gradually increased inductive reactive power electric current to the grid entry point.
7. device according to claim 6, which is characterized in that described to control the wind power generating set to the grid entry point
Gradually increased capacitive reactive power electric current is provided, including：
According to the power-factor angle before the increase rate and low voltage crossing of the active power of the wind power generating set, really
The increase rate of the fixed capacitive reactive power electric current；
According to the increase rate of the capacitive reactive power electric current, the wind power generating set is controlled to be provided to the grid entry point and is gradually increased
Big capacitive reactive power electric current.
8. device according to claim 5, which is characterized in that described that the capacitive reactive power electricity provided to the grid entry point is provided
Stream, including：
According to the grid entry point voltage before voltage sag type, the low voltage crossing, the grid entry point during the low voltage crossing
Voltage, the rated current of wind power generating set output and the rated voltage, determine the capacitive reactive power for needing to provide electricity
Stream；
To capacitive reactive power electric current determined by grid entry point offer.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109193753A (en) * | 2018-08-22 | 2019-01-11 | 北京金风科创风电设备有限公司 | Wind power converter low voltage ride through control method, device, equipment and storage medium |
| CN111082473A (en) * | 2019-12-10 | 2020-04-28 | 国网西藏电力有限公司电力科学研究院 | Station level reactive power coordination control method and system |
| CN112968464A (en) * | 2019-12-13 | 2021-06-15 | 新疆金风科技股份有限公司 | High-low voltage continuous ride through control method and system for permanent magnet direct-drive wind generating set |
| WO2021114588A1 (en) * | 2019-12-13 | 2021-06-17 | 新疆金风科技股份有限公司 | High-low voltage continuous ride-through control method and system for permanent magnet direct-drive wind power generating set |
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| CN109193753A (en) * | 2018-08-22 | 2019-01-11 | 北京金风科创风电设备有限公司 | Wind power converter low voltage ride through control method, device, equipment and storage medium |
| CN111082473A (en) * | 2019-12-10 | 2020-04-28 | 国网西藏电力有限公司电力科学研究院 | Station level reactive power coordination control method and system |
| CN112968464A (en) * | 2019-12-13 | 2021-06-15 | 新疆金风科技股份有限公司 | High-low voltage continuous ride through control method and system for permanent magnet direct-drive wind generating set |
| WO2021114589A1 (en) * | 2019-12-13 | 2021-06-17 | 新疆金风科技股份有限公司 | Control method and system for continuous high and low voltage ride through of permanent-magnet direct-drive wind-driven generator set |
| WO2021114588A1 (en) * | 2019-12-13 | 2021-06-17 | 新疆金风科技股份有限公司 | High-low voltage continuous ride-through control method and system for permanent magnet direct-drive wind power generating set |
| CN112994074A (en) * | 2019-12-13 | 2021-06-18 | 新疆金风科技股份有限公司 | Low-high voltage continuous ride through control method and system for permanent magnet direct-drive wind generating set |
| US20230022678A1 (en) * | 2019-12-13 | 2023-01-26 | Xinjiang Goldwind Science & Technology Co., Ltd. | High-low voltage continous ride-through control method and system for permanent magnet direct-drive wind power generating set |
| EP4075628A4 (en) * | 2019-12-13 | 2023-06-07 | Xinjiang Goldwind Science & Technology Co., Ltd. | Control method and system for continuous high and low voltage ride through of permanent-magnet direct-drive wind-driven generator set |
| US11677345B2 (en) | 2019-12-13 | 2023-06-13 | Xinjiang Goldwind Science & Technology Co., Ltd. | Control method and system for continuous high and low voltage ride through of permanent-magnet direct-drive wind-driven generator set |
| AU2020401898B2 (en) * | 2019-12-13 | 2023-09-21 | Goldwind Science & Technology Co., Ltd. | High-low voltage continuous ride-through control method and system for permanent magnet direct-drive wind power generating set |
| US11817712B2 (en) * | 2019-12-13 | 2023-11-14 | Xinjiang Goldwind Science & Technology Co., Ltd. | High-low voltage continuous ride-through control method and system for permanent magnet direct-drive wind power generating set |
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