CN107147141A - Inverter control method and device of wind generating set - Google Patents
Inverter control method and device of wind generating set Download PDFInfo
- Publication number
- CN107147141A CN107147141A CN201710262445.0A CN201710262445A CN107147141A CN 107147141 A CN107147141 A CN 107147141A CN 201710262445 A CN201710262445 A CN 201710262445A CN 107147141 A CN107147141 A CN 107147141A
- Authority
- CN
- China
- Prior art keywords
- net side
- control
- inverter
- side inverter
- limit value
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 35
- 230000005611 electricity Effects 0.000 claims description 15
- 238000001514 detection method Methods 0.000 claims description 5
- 238000013270 controlled release Methods 0.000 claims 1
- 238000010521 absorption reaction Methods 0.000 description 5
- 238000012423 maintenance Methods 0.000 description 4
- 238000011217 control strategy Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000004422 calculation algorithm Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- H02J3/386—
-
- 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
Landscapes
- Inverter Devices (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
The embodiment of the invention provides a method and a device for controlling an inverter of a wind generating set. The inverter control method includes: if the detected grid voltage is smaller than the first voltage threshold value, determining that a grid-side inverter of the wind generating set enters a low-voltage ride-through state; and if the grid-side inverter is in a low voltage ride through state and the grid voltage is detected to be increased to be larger than a second voltage threshold value, the working current limit value of the grid-side inverter is controlled to be gradually increased, wherein the second voltage threshold value is larger than the first voltage threshold value. By adopting the scheme, the power value of the grid-side inverter can be limited by controlling the working current limit value of the grid-side inverter to be gradually increased, so that the problem of direct-current bus overvoltage caused by the fact that the grid-side inverter absorbs power of a power grid from the power grid is solved.
Description
Technical field
The present invention relates to technical field of wind power generation, more particularly to a kind of inverter control method of wind power generating set and
Device.
Background technology
In the running of wind power generating set, when power network is due to disturbance or failure, line voltage value moment drops to
1P.U (Per Unit, perunit value) below when, the control system of wind power generating set can be realized in electricity by adjusting control strategy
Being uninterruptedly incorporated into the power networks during net voltage failure.Wherein, the current transformer of wind power generating set performs main low voltage crossing
Control.In existing low voltage crossing control strategy, when electric network fault is eliminated, power network is in low voltage crossing and recovers state,
The general active power to current transformer is not limited, and controls current transformer Operation at full power.
But, electric network voltage phase angle and frequency now still can significantly change, and net side inverter may be due to work
Power is excessive to there is unstable working state, may be changed into absorbed power state when serious from inverter power state.Moreover, pusher side
Rectifier can also think that dc bus injects active power, so that cause dc bus to absorb excessive active power, it is single in braking
On first dc bus that can not be released due to overload during excessive energy, DC bus-bar voltage will be caused to exceed maximum functional electricity
Pressure, causes component failure, increases the maintenance cost of wind power generating set, and also can result in low voltage crossing failure.
The content of the invention
Embodiments of the invention provide a kind of inverter control method and device of wind power generating set, to solve existing skill
Net side inverter easily absorbs active power, caused dc bus overpressure problems from power network when low voltage crossing recovers in art.
To reach above-mentioned purpose, The embodiment provides a kind of inverter control method of wind power generating set,
Including：If detecting line voltage less than first voltage threshold value, it is determined that the net side inverter of wind power generating set enters low
Voltage ride-through state；If the net side inverter is in the low voltage crossing state, and detects line voltage increasing
It is big then to control the operating current limit value of the net side inverter gradually to increase to second voltage threshold value is more than, wherein, described second
Voltage threshold is more than the first voltage threshold value.
Alternatively, the operating current limit value of the control net side inverter gradually increases, including：Control net side inverter
Watt current limit value and reactive current limit value gradually increase；And/or, control the active power limit value and idle work(of net side inverter
Rate limit value gradually increases.
Alternatively, the operating current limit value of the control net side inverter gradually increases, including：Control net side inverter
Operating current limit value increases linearly over time.
Alternatively, the inverter control method also includes：Increased in the operating current limit value of the net side inverter
During the maximum operating currenbt of net side inverter, the operating current that the maximum operating currenbt is set as the net side inverter is limited
Value.
Alternatively, if in the line voltage that detects less than after first voltage threshold value, in addition to：Control net side inverse
Become device and switch to execution reactive current priority acccess control from watt current priority acccess control is performed.
Alternatively, the inverter control method also includes：Increased to detecting line voltage more than second voltage threshold
During value, control net side inverter switches to execution watt current priority acccess control from reactive current priority acccess control is performed；Or, institute
When the operating current limit value for stating net side inverter increases to the maximum operating currenbt of net side inverter, control net side inverter is from holding
Row reactive current priority acccess control switches to execution watt current priority acccess control.
Alternatively, the inverter control method also includes：It is more than default discharge voltage detecting DC bus-bar voltage
During threshold value, the brake unit of the wind power generating set is controlled to release dc bus energy.
According to another aspect of the present invention, embodiments of the invention also provide a kind of inverter control of wind power generating set
Device, including：Detection module, if for detecting line voltage less than first voltage threshold value, it is determined that wind power generating set
Net side inverter enter low voltage crossing state；First control module, if for the net side inverter in described
Low voltage crossing state, and detect line voltage and increase to more than second voltage threshold value, then control the net side inverter
Operating current limit value gradually increase, wherein, the second voltage threshold value be more than the first voltage threshold value.
Alternatively, first control module is used for the watt current limit value and reactive current limit value for controlling net side inverter
Gradually increase；And/or, control the active power limit value and reactive power limit value of net side inverter gradually to increase.
Alternatively, first control module is used for：The operating current limit value of control net side inverter increases linearly over time
Greatly.
Alternatively, first control module is additionally operable to：Net is increased in the operating current limit value of the net side inverter
During the maximum operating currenbt of side inverter, the operating current that the maximum operating currenbt is set as the net side inverter is limited
Value.
Alternatively, the control device for inverter also includes：Second control module, if small for detecting line voltage
In first voltage threshold value, then net side inverter is controlled to switch to execution reactive current preferentially to control from watt current priority acccess control is performed
System.
Alternatively, the control device for inverter also includes：3rd control module, for detecting line voltage increase
To when being more than second voltage threshold value, control net side inverter switches to execution watt current excellent from reactive current priority acccess control is performed
First control；Or, the maximum operating currenbt for increasing to net side inverter in the operating current limit value of the net side inverter
When, control net side inverter switches to execution watt current priority acccess control from reactive current priority acccess control is performed.
Alternatively, the control device for inverter also includes：4th control module, for detecting DC bus-bar voltage
During more than default discharge voltage threshold value, the brake unit of the wind power generating set is controlled to release dc bus energy.
According to the inverter control scheme of the wind power generating set of the present embodiment, by detect line voltage it is whether too small come
Determine that whether the net side inverter of wind power generating set enters low voltage crossing state, and persistently detect in low voltage crossing state
Line voltage, when line voltage increases to normal condition, control net side inverter operating current limit value gradually increase, with up to
To the purpose of the performance number of limitation net side inverter, so as to solve caused by net side inverter is from power network absorption grid power
The problem of dc bus is over-pressed, and then the problem of avoid component failure, reduce the maintenance cost of wind power generating set.
Brief description of the drawings
Fig. 1 is the flow chart of the inverter control method of the wind power generating set of embodiments of the invention one；
Fig. 2 is the flow chart of the inverter control method of the wind power generating set of embodiments of the invention two；
The grid voltage sags that Fig. 3 provides for the inverter control method of the wind power generating set of embodiments of the invention two
Curve and current limit controlling curve；
Fig. 4 is the structured flowchart of the control device for inverter of the wind power generating set of embodiments of the invention three.
Embodiment
(identical label represents identical element in some accompanying drawings) is to the wind-force of the embodiment of the present invention below in conjunction with the accompanying drawings
Inverter control method, device and the device of generating set are described in detail.Following examples are used to illustrate the present invention, but not
For limiting the scope of the present invention.
Embodiment one
Fig. 1 is the flow chart of the inverter control method of the wind power generating set of embodiments of the invention one.
As shown in figure 1, the inverter control method of the wind power generating set of the present embodiment includes：
S110, if detecting line voltage less than first voltage threshold value, it is determined that the net side inversion of wind power generating set
Device enters low voltage crossing state.
Wherein, first voltage threshold value is used to judge whether line voltage drops to mains voltage signal and fluctuate larger and easy hair
The lower region of raw distortion, when line voltage is less than first voltage threshold value, it may be determined that grid collapses.First voltage threshold
The span of value can be 0~1P.U.The empirical value that first voltage threshold value can be controlled according to actual low voltage crossing come
It is determined that, it can also obtain experimental data to determine with reference to simulation calculation.For example, first voltage threshold value can be 0.88P.U.
, can be by setting voltage detection device (for example, voltage is passed in grid entry point in the running of wind power generating set
Sensor), periodically to detect the grid-connected voltage signal of wind power generating set, and handle by voltage processing equipment power network electricity
Pressure.When detecting line voltage less than first voltage threshold value, grid collapses are determined, and then determine wind power generating set
Net side current transformer enters low voltage crossing state.To ensure that off-grid is not run wind power generating set, performs to wind power generating set
Low voltage crossing is controlled, including by the watt current priority acccess control under the normal operating conditions performed by net side inverter, is switched
For the reactive current priority acccess control under low voltage crossing state.
S120, if net side inverter is in low voltage crossing state, and detects line voltage and increases to and be more than
Second voltage threshold value, then control the operating current limit value of net side inverter gradually to increase.
Wherein, second voltage threshold value is more than first voltage threshold value.Second voltage threshold value is used to judge whether line voltage increases
Length to mains voltage signal fluctuates normal interval that is smaller and will not being distorted.Second voltage threshold value is more than first voltage threshold
Value, and the span of first voltage threshold value can be 0~1P.U.For example, first voltage threshold value can be 0.88P.U, second
Voltage threshold can be 0.92P.U.
When net side inverter is in low voltage crossing state, persistently detect line voltage value whether from less than first voltage
Threshold value, is increased to more than second voltage threshold value.When detecting line voltage and increasing to more than second voltage threshold value, low-voltage is worn
Recovery state is more in, the operating current limit value of control net side inverter gradually increases.Wherein, operating current limit value is that net side is inverse
Become the higher limit of the current operating current of device, amplitude limiting processing done available for the operating current to net side inverter, that is, using by
Cumulative big operating current limit value, amplitude limiting processing is done to the operating current of net side inverter.For example, by real time to net side inversion
Device sends the instruction for the set-point for carrying operating current limit value, to control the operating current limit value of net side inverter gradually to increase.
During the operating current limit value of control net side inverter gradually increases, even if net side inverter is from grid side
Active power is absorbed, the performance number of net side inverter is still in controllable state so that the power that dc bus absorbs is also limited, no
Easily exceed the maximum working voltage of dc bus, so as to be led fundamentally avoiding by a large amount of active power of net side inverter absorption
The dc bus overpressure problems of cause, also further increase the success rate of low voltage crossing, it is ensured that the stability of power network.
In a kind of optional embodiment, since detecting line voltage and increasing at the time of second voltage threshold value is corresponded to
Timing, it is zero in the moment corresponding operating current limit value to set net side inverter, and controls the operating current of net side inverter
Limit value gradually increases with the time.
According to the inverter control method of the wind power generating set of the present embodiment, by detect line voltage it is whether too small come
Determine that whether the net side inverter of wind power generating set enters low voltage crossing state, and persistently detect in low voltage crossing state
Line voltage, when line voltage increases to normal condition, control net side inverter operating current limit value gradually increase, with up to
To the purpose of the performance number of limitation net side inverter, so as to solve because net side inverter is from the direct current caused by power network absorbed power
The problem of bus overvoltage, and then the problem of avoid component failure, reduce the maintenance cost of wind power generating set.
The inverter control method of the wind power generating set of above-mentioned the present embodiment, can by wind power generating set current transformer
Controller, and the control device such as net side circuit control device are performed.But it should be understood by those skilled in the art that actually should
In, any other equipment with corresponding data acquisition and processing (DAP) function may be referred to the present embodiment and perform the present invention
Wind power generating set inverter control method.
Embodiment two
Fig. 2 is the flow chart of the inverter control method of the wind power generating set of embodiments of the invention two, and this method can
It is considered as a kind of optional embodiment of the inverter control method of the wind power generating set of above-described embodiment one.
The executive agent of the inverter control method for carrying out wind power generating set of the present embodiment, can have accordingly to be any
Data acquisition and processing (DAP) function equipment.Inverter controller including wind power generating set, net side circuit control device, with
And independently of inverter controller and the controller of net side circuit control device, but not limited to this.
As shown in Fig. 2 the inverter control method of the wind power generating set of the present embodiment includes：
S210, judges whether line voltage is less than first voltage threshold value.
Wherein, first voltage threshold value is used to judge whether power network breaks down, and is less than first voltage threshold value in line voltage
When, it may be determined that grid collapses cause grid voltage sags to lower region.
In the running of wind power generating set, power network electricity can be detected by setting voltage sensor in grid entry point
Pressure, and judge whether the line voltage detected drops to first voltage threshold value.If the line voltage detected is more than the first electricity
Press threshold value, it is determined that line voltage does not drop to lower region, and wind power generating set now, is held still in normal operating condition
Row step S260, control net side inverter continues normal operation.If the line voltage detected is less than (or equal to) first electricity
Press threshold value, it is determined that grid voltage sags to lower region, now, step S220 is performed, to ensure that wind power generating set does not take off
Network operation.
S220, determines that net side inverter enters low voltage crossing state, it is preferential that control net side inverter performs reactive current
Control.
In the present embodiment, in the normal course of operation of wind power generating set, it is preferential that net side inverter performs watt current
Control, to increase the grid-connected power of wind power generating set.When detecting grid voltage sags to less than first voltage threshold value, really
The net side inverter for determining wind-driven generator unit enters low voltage crossing state, and it is excellent to control net side inverter to perform reactive current
First control.
In a kind of optional embodiment, when detecting line voltage value less than first voltage threshold value, cancel outside nothing
Work(is given (for example, to the idle given of remote controllers), calculates reactive current set-point now, control net side inverter from
Perform the limited control of watt current and switch to execution reactive current priority acccess control.Specifically, first, by wind power generating set
Reactive current control device, reactive current set-point I is calculated according to reactive current rule during fault traversingq_ref, and judge idle
Given value of current value Iq_refWhether maximum current limit value I is more thanmax1.If Iq_refMore than Imax1, then by Iq_refIt is revised as Imax1.Such as
Fruit Iq_refLess than or equal to Imax1, then I is not changedq_ref.Then, the dc bus outer ring controller in wind power generating set is passed through
(pi regulator), obtains watt current set-point Id_ref, and judge watt current set-point Id_refWhether meetIf it is satisfied, then not changing Id_ref；If be unsatisfactory for, by Id_refIt is revised asFinally, by the I of determinationq_refAnd Id_refFor net side inverter control algorithm, generate for controlling net side inverse
Become the IGBT of device gate pole switching signal.Wherein, Imax1For the maximum current limit value of net side inverter, for net side inverter
Operating current carry out amplitude limiting processing.Imax1Less than or equal to the maximum operating currenbt I of net side invertermax(illustrate herein,
Maximum operating currenbt ImaxThe maximum sustainable operating current that can be can bear for net side inverter, and/or, net side inverter
The maximum operating current sustainable in short-term that can bear, and
S230, judges whether line voltage is more than second voltage threshold value.
As shown in figure 3, in 0~t1 periods, net side inverter is in normal operating conditions；In t1~t2 periods, net side is inverse
Become device and be in low voltage crossing state, line voltage can first continue to reduce, then continue to increase.Pass through the power network for judging to detect
Whether voltage increases to greater than second voltage threshold value from less than first voltage threshold value, it may be determined that whether low voltage crossing state is extensive
It is multiple.In t2~t3 periods, line voltage increases to greater than second voltage threshold value, and line voltage recovers to fluctuating less normal area
Domain, net side inverter is in low voltage crossing and recovers state.T2 moment of the line voltage more than second voltage threshold value is being detected,
Perform step S240.If line voltage does not increase to second voltage threshold value, it is determined that net side inverter is still in low voltage crossing
State, and continue executing with step S220.
S240, the operating current limit value of control net side inverter increases linearly over time, and is detecting dc bus electricity
When pressure is more than default discharge voltage threshold value, the brake unit of control wind power generating set is released dc bus energy.
When detecting line voltage more than second voltage threshold value, determine that net side inverter is in low voltage crossing and recovers shape
State, the operating current limit value of control net side inverter gradually increases, to be increased by the operating current for limiting net side inverter
Fast mode, to limit the performance number of net side inverter, so as to prevent dc bus from overpressure problems occur.Preferably, net is controlled
The operating current limit value of side inverter increases linearly over time.Certainly, in other embodiments, net side inverter can also be controlled
Operating current limitation according to the nonlinear function of time, or the other forms such as stage function gradually increase.
As shown in figure 3, in 0~t1 periods of net side inverter normal work, the work electricity of net side inverter can be controlled
Restriction value is maximum operating currenbt Imax；T1~t2 periods of low voltage crossing state are in net side inverter, can be by upper
The mode of reactive current priority acccess control, the operating current limit value for controlling net side inverter is maximum current limit value Imax1；In net side
Inverter is in t2~t3 periods that low voltage crossing recovers state, can be according to formula：Imax2=K*t, to control net side inverse
The operating current limit value for becoming device increases linearly over time.Wherein, time t timing since the t2 moment, K is slope.
, can be by controlling the watt current limit value and reactive current of net side inverter respectively in addition, in actual applications
Limit value gradually increases, to realize that the operating current limit value of control net side inverter gradually increases.For example, controlling watt current respectively
Limit value Id_maxAccording to formula：Id_max=Kd* t increases linearly over time, and control reactive current limit value Iq_maxAccording to formula：
Iq_max=Kq* t increases linearly over time.Wherein, time t timing since the t2 moment, KdAnd KqRespectively slope.
Or, control the active power limit value and reactive power limit value of net side inverter gradually to increase respectively, with voltage
In the case of certain or change is less, by limiting active power and reactive power respectively, to limit watt current and idle electricity
Stream, and then realize that the operating current limit value of control net side inverter gradually increases.
In the present embodiment, DC bus-bar voltage is detected in real time, and be more than default vent discharge detecting DC bus-bar voltage
When pressing threshold value, control brake unit is released dc bus energy.For example, being in low voltage crossing in net side inverter recovers state
When, increased to if detecting DC bus-bar voltage more than default discharge voltage threshold value, to prevent the problem of dc bus is over-pressed, control
The brake unit of wind power generating set processed is released dc bus energy.Specifically, the power model in brake unit can be controlled
Open, by the braking resistor that is connected with the power model come dc bus energy of releasing, it is to avoid because pusher side rectifier is to direct current
The injection rate of the active power of bus injection is more than the inverter power amount of net side inverter, causes DC bus-bar voltage to exceed maximum
Operating voltage, so as to further prevent dc bus overpressure problems.
S250, judges whether operating current limit value increases to maximum operating currenbt.
As shown in figure 3, when the operating current limit value of control net side inverter gradually increases, if the work of net side inverter
Current limit does not increase to maximum operating currenbt Imax, then step S240, the operating current limit of control net side inverter are continued executing with
Value continues to increase.If the operating current limit value of net side inverter increases to maximum operating currenbt Imax, then step S260 is performed, will
Maximum operating currenbt ImaxIt is set as the operating current limit value of net side inverter.
S260, the maximum operating currenbt of net side inverter is set as the operating current limit value of net side inverter, controls net
Side inverter performs watt current priority acccess control.
Recover state period t2~t3 periods by the low voltage crossing of net side inverter, line voltage recovers to normal area
Domain, can switch to normal mode of operation by the mode of operation of net side inverter, that is, the maximum functional of net side inverter is electric
Flow ImaxIt is set as operating current limit value.Also, when line voltage is fully returned to normal region, control net side inverter from
Perform reactive current priority acccess control and switch to execution watt current priority acccess control, may further ensure that the success of low voltage crossing
Rate.
In a kind of optional embodiment, the mode for the watt current priority acccess control that net side inverter is performed is：First, lead to
The dc bus outer ring controller crossed in wind power generating set obtains watt current set-point Id_ref, and judge that watt current gives
Value Id_refWhether maximum operating currenbt I is more thanmax.If Id_refMore than Imax, then by Id_refIt is revised as Imax.If Id_refIt is less than
Or equal to Imax, then I is not changedd_ref.Then, reactive current is calculated by the reactive current control device in wind power generating set to give
Definite value Iq_ref, and judge reactive current set-point Iq_refWhether meetIf it is satisfied, then not changing
Iq_ref；If be unsatisfactory for, by Iq_refIt is revised asFinally, by the I of determinationq_refAnd Id_refIt is inverse for net side
Become device control algolithm, generate the gate pole switching signal of the IGBT for controlling net side inverter.
The control method of the net side inverter of the above-mentioned wind power generating set for the present embodiment, equivalent in net side inverter
The transition stage returned to from low voltage crossing state between normal operating conditions, controls the operating current limit value of net side inverter
Gradually increase, to control the operating current of net side inverter to gather way, so as to limit the performance number of net side inverter, reach
The purpose for the energy that dc bus absorbs is limited, the problem of dc bus is over-pressed is efficiently solved.
In actual application scenarios, the control method of above-mentioned net side inverter may also adapt to adjust the suitable of each step
Sequence.For example, in step S260, maximum operating currenbt I is increased in the operating current limit value of net side invertermaxWhen, control net side
Inverter switches to execution watt current priority acccess control from reactive current priority acccess control is performed, and is worn for further improving low-voltage
Success rate more.In actual applications, when the second voltage threshold value more than normal region can be increased in line voltage, control
Net side inverter switches to execution watt current priority acccess control from reactive current priority acccess control is performed, to improve net side inverter
Inverter power.
The inverter control method of the wind power generating set of the embodiment of the present invention, on the basis of above-described embodiment one, enters
One step is shown when net side inverter recovers state in low voltage crossing, controls the operating current limit value of net side inverter
The concrete mode gradually increased, the operating current for effectively limiting net side inverter gathers way, and has reached that limitation net side is inverse
Become the purpose of the performance number of device, so as to limit the energy of dc bus absorption, efficiently solve the problem of dc bus is over-pressed；And
And, by when the operating current limit value of net side inverter increases to maximum operating currenbt, controlling net side inverter from execution nothing
Work(electric current priority acccess control switches to execution watt current priority acccess control, further increases the success rate of low voltage crossing.
Embodiment three
Fig. 4 is the structured flowchart of the control device for inverter of the wind power generating set of embodiments of the invention three.
As shown in figure 4, the control device for inverter of the wind power generating set includes the control module of detection module 410 and first
420.If detection module 410 is used to detect line voltage less than first voltage threshold value, it is determined that the net of wind power generating set
Side inverter enters low voltage crossing state；If the first control module 420 is used for net side inverter is in low voltage crossing
State, and detect line voltage and increase to more than second voltage threshold value, then control the operating current limit value of net side inverter
Gradually increase, wherein, second voltage threshold value is more than first voltage threshold value.
According to the control device for inverter of the wind power generating set of the present embodiment, by detect line voltage it is whether too small come
Determine that whether the net side inverter of wind power generating set enters low voltage crossing state, and persistently detect in low voltage crossing state
Line voltage, when line voltage increases to normal condition, control net side inverter operating current limit value gradually increase, with up to
To the purpose of the performance number of limitation net side inverter, so as to solve caused by net side inverter is from power network absorption grid power
The problem of dc bus is over-pressed, and then the problem of avoid component failure, reduce the maintenance cost of wind power generating set.
Further, the first control module 420 is additionally operable to increase to net side in the operating current limit value of net side inverter inverse
When becoming the maximum operating currenbt of device, maximum operating currenbt is set as to the operating current limit value of net side inverter.
Further, the control device for inverter of the present embodiment also includes the second control module 430, if for detecting
Line voltage is less than first voltage threshold value, then controls net side inverter to switch to execution idle from watt current priority acccess control is performed
Electric current priority acccess control.
Further, the control device for inverter of the present embodiment also includes the 3rd control module 440, for detecting electricity
When net voltage is increased to more than second voltage threshold value, control net side inverter switches to execution from reactive current priority acccess control is performed
Watt current priority acccess control；Or, the maximum work for increasing to net side inverter in the operating current limit value of net side inverter
When making electric current, control net side inverter switches to execution watt current priority acccess control from reactive current priority acccess control is performed.
Further, the first control module 420 is used to control the operating current limit value of net side inverter linearly over time to increase
Greatly.
Further, the first control module 420 is used for the watt current limit value for controlling net side inverter and reactive current limit
Value gradually increases；And/or, control the active power limit value and reactive power limit value of net side inverter gradually to increase.
Further, the control device for inverter of the present embodiment also includes the 4th control module 450, for detecting directly
When flowing busbar voltage and being more than default discharge voltage threshold value, the brake unit of control wind power generating set is released dc bus energy.
In actual applications, the control device for inverter of the present embodiment can be integrated in the current transformer control of wind power generating set
In device processed, it can also be integrated in net side inverter control, it is, of course, also possible to independently of inverter controller and net side inverter
Controller is set.
The control device for inverter of the present embodiment can be used for performing above-described embodiment one or the wind-driven generator of embodiment two
The inverter control method of group, when net side inverter recovers state in low voltage crossing, to control net side inverter
Operating current limit value gradually increases, and then limits the operating current of net side inverter and gather way, and reaches limitation net side inversion
The purpose of the performance number of device, so as to limit the energy of dc bus absorption, efficiently solves the problem of dc bus is over-pressed.
It may be noted that the need for according to implementation, all parts/step described in this application can be split as into more multi-section
The part operation of two or more components/steps or components/steps, can also be combined into new components/steps by part/step,
To realize the purpose of the present invention.
The foregoing is only a specific embodiment of the invention, but protection scope of the present invention is not limited thereto, any
Those familiar with the art the invention discloses technical scope in, change or replacement can be readily occurred in, should all be contained
Cover 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 (14)
1. a kind of inverter control method of wind power generating set, it is characterised in that including：
If detecting line voltage less than first voltage threshold value, it is determined that the net side inverter of wind power generating set enters low electricity
Pressure passes through state；
If the net side inverter is in the low voltage crossing state, and detects line voltage and increase to more than the
Two voltage thresholds, then control the operating current limit value of the net side inverter gradually to increase, wherein, the second voltage threshold value is big
In the first voltage threshold value.
2. inverter control method according to claim 1, it is characterised in that the work electricity of the control net side inverter
Restriction value gradually increases, including：
The watt current limit value and reactive current limit value of net side inverter is controlled gradually to increase；And/or,
The active power limit value and reactive power limit value of net side inverter is controlled gradually to increase.
3. inverter control method according to claim 1, it is characterised in that the work electricity of the control net side inverter
Restriction value gradually increases, including：
The operating current limit value of control net side inverter increases linearly over time.
4. inverter control method according to claim 1, it is characterised in that also include：
When the operating current limit value of the net side inverter increases to the maximum operating currenbt of net side inverter, by the maximum
Operating current is set as the operating current limit value of the net side inverter.
5. the inverter control method according to claim any one of 1-4, it is characterised in that if detecting electricity described
Net voltage is less than after first voltage threshold value, in addition to：
Control net side inverter switches to execution reactive current priority acccess control from watt current priority acccess control is performed.
6. inverter control method according to claim 5, it is characterised in that also include：
When detecting line voltage and increasing to more than second voltage threshold value, control net side inverter is preferential from reactive current is performed
Control switches to execution watt current priority acccess control；Or,
When the operating current limit value of the net side inverter increases to the maximum operating currenbt of net side inverter, control net side is inverse
Become device and switch to execution watt current priority acccess control from reactive current priority acccess control is performed.
7. the inverter control method according to claim 6, it is characterised in that also include：
When detecting DC bus-bar voltage more than default discharge voltage threshold value, the brake unit of the wind power generating set is controlled
Release dc bus energy.
8. a kind of control device for inverter of wind power generating set, it is characterised in that including：
Detection module, if for detecting line voltage less than first voltage threshold value, it is determined that the net side of wind power generating set
Inverter enters low voltage crossing state；
First control module, if being in the low voltage crossing state for the net side inverter, and detects electricity
Net voltage is increased to more than second voltage threshold value, then controls the operating current limit value of the net side inverter gradually to increase, wherein,
The second voltage threshold value is more than the first voltage threshold value.
9. control device for inverter according to claim 8, it is characterised in that first control module is used to control net
The watt current limit value and reactive current limit value of side inverter gradually increase；And/or,
The active power limit value and reactive power limit value of net side inverter is controlled gradually to increase.
10. control device for inverter according to claim 8, it is characterised in that first control module is used for：
The operating current limit value of control net side inverter increases linearly over time.
11. control device for inverter according to claim 8, it is characterised in that first control module is additionally operable to：
When the operating current limit value of the net side inverter increases to the maximum operating currenbt of net side inverter, by the maximum
Operating current is set as the operating current limit value of the net side inverter.
12. the control device for inverter according to claim any one of 8-11, it is characterised in that also include：
Second control module, if for detecting line voltage less than first voltage threshold value, control net side inverter is from holding
Row watt current priority acccess control switches to execution reactive current priority acccess control.
13. control device for inverter according to claim 12, it is characterised in that also include：
3rd control module, for when detecting line voltage and increasing to more than second voltage threshold value, controlling net side inverter
Execution watt current priority acccess control is switched to from reactive current priority acccess control is performed；Or, in the net side inverter
When operating current limit value increases to the maximum operating currenbt of net side inverter, control net side inverter is preferential from reactive current is performed
Control switches to execution watt current priority acccess control.
14. the control device for inverter according to claim 13, it is characterised in that also include：
4th control module, for when detecting DC bus-bar voltage more than default discharge voltage threshold value, controlling the wind-force
The brake unit of generating set is released dc bus energy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710262445.0A CN107147141B (en) | 2017-04-20 | 2017-04-20 | Inverter control method and device of wind generating set |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710262445.0A CN107147141B (en) | 2017-04-20 | 2017-04-20 | Inverter control method and device of wind generating set |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107147141A true CN107147141A (en) | 2017-09-08 |
| CN107147141B CN107147141B (en) | 2021-01-26 |
Family
ID=59775223
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710262445.0A Active CN107147141B (en) | 2017-04-20 | 2017-04-20 | Inverter control method and device of wind generating set |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107147141B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107732973A (en) * | 2017-11-21 | 2018-02-23 | 浙江大学 | For the inverter low voltage traversing control method of weak net distal end fatal voltage failure |
| CN108539751A (en) * | 2018-05-09 | 2018-09-14 | 国网湖南省电力有限公司 | A kind of area power grid AVC control methods and system |
| CN109755966A (en) * | 2019-03-25 | 2019-05-14 | 哈尔滨工业大学 | The collaboration fault ride-through method that extensive offshore wind farm is sent outside through flexible direct current |
| CN111373648A (en) * | 2017-11-22 | 2020-07-03 | 西门子股份公司 | Energy transmission via a bipolar HVDC transmission line |
| CN117578536A (en) * | 2023-10-19 | 2024-02-20 | 上海勘测设计研究院有限公司 | Network-structured energy storage control method and system for weak alternating current system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2345758A2 (en) * | 2008-07-02 | 2010-09-30 | American Superconductor Corporation | Low voltage ride through |
| CN101902052A (en) * | 2010-08-10 | 2010-12-01 | 龙源电力集团股份有限公司 | Wind power station whole low voltage ride through (LVRT) system |
| CN101958554A (en) * | 2009-07-20 | 2011-01-26 | 通用电气公司 | The system, the method and apparatus that are used for the operand power transducer |
| CN102664427A (en) * | 2012-05-25 | 2012-09-12 | 华北电力大学（保定） | Active and reactive coordination control method for permanent-magnet direct-driven wind turbines in low-voltage ride-through process |
| CN103094921A (en) * | 2013-01-06 | 2013-05-08 | 宁夏电力公司电力科学研究院 | Electromechanical transient modeling method and electromechanical transient model of direct-drive-type wind turbine generator system |
-
2017
- 2017-04-20 CN CN201710262445.0A patent/CN107147141B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2345758A2 (en) * | 2008-07-02 | 2010-09-30 | American Superconductor Corporation | Low voltage ride through |
| CN101958554A (en) * | 2009-07-20 | 2011-01-26 | 通用电气公司 | The system, the method and apparatus that are used for the operand power transducer |
| CN101902052A (en) * | 2010-08-10 | 2010-12-01 | 龙源电力集团股份有限公司 | Wind power station whole low voltage ride through (LVRT) system |
| CN102664427A (en) * | 2012-05-25 | 2012-09-12 | 华北电力大学（保定） | Active and reactive coordination control method for permanent-magnet direct-driven wind turbines in low-voltage ride-through process |
| CN103094921A (en) * | 2013-01-06 | 2013-05-08 | 宁夏电力公司电力科学研究院 | Electromechanical transient modeling method and electromechanical transient model of direct-drive-type wind turbine generator system |
Non-Patent Citations (1)
| Title |
|---|
| 邱纪星: "基于DIgSILENT/PowerFactory的双馈风力发电系统的低电压穿越研究", 《中国优秀硕士学位论文全文数据库》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107732973A (en) * | 2017-11-21 | 2018-02-23 | 浙江大学 | For the inverter low voltage traversing control method of weak net distal end fatal voltage failure |
| CN111373648A (en) * | 2017-11-22 | 2020-07-03 | 西门子股份公司 | Energy transmission via a bipolar HVDC transmission line |
| CN108539751A (en) * | 2018-05-09 | 2018-09-14 | 国网湖南省电力有限公司 | A kind of area power grid AVC control methods and system |
| CN109755966A (en) * | 2019-03-25 | 2019-05-14 | 哈尔滨工业大学 | The collaboration fault ride-through method that extensive offshore wind farm is sent outside through flexible direct current |
| CN117578536A (en) * | 2023-10-19 | 2024-02-20 | 上海勘测设计研究院有限公司 | Network-structured energy storage control method and system for weak alternating current system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107147141B (en) | 2021-01-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107147141A (en) | Inverter control method and device of wind generating set | |
| Torres-Olguin et al. | Offshore wind farm grid integration by VSC technology with LCC-based HVDC transmission | |
| CA2784306C (en) | Control method for low voltage ride through | |
| CN208738855U (en) | A kind of bipolar soft straight network system of wind-powered electricity generation | |
| CN109830978B (en) | Control method of wind power flexible-straight system with fault automatic ride-through capability | |
| CN105406499B (en) | A kind of intelligent Hybrid HVDC system and fault handling method | |
| CN103986136B (en) | A kind of novel and multifunctional fault current limiting system and its control method that technology is stored up based on light | |
| CN109347144B (en) | Low voltage ride through method of wind power flexible direct current output system | |
| CN104362616B (en) | Direct-current short-circuit fault ride-through method of modular multilevel converter of full-bridge submodule | |
| CN106786737B (en) | A kind of low voltage traversing control method for collecting and distributing type photovoltaic generating system | |
| CN101969201A (en) | Dynamic voltage stabilizer for assisting wind driven generator in realizing low voltage ride through (LVRT) | |
| JP2011193685A (en) | Power conditioner | |
| CN202172281U (en) | Grid-connected wind generating set | |
| CN102904280A (en) | Device and method for traversing grid fault by double-fed wind power converter | |
| CN103311946B (en) | Constant arc-extinguishing area control method of direct-current power transmission control system | |
| CN111628507A (en) | Novel phase modulator and SVG coordinated control method for suppressing transient overvoltage | |
| Xin et al. | AC fault ride-through coordinated control strategy of LCC-MMC hybrid DC transmission system connected to passive networks | |
| CN102412597A (en) | Low voltage ride through control method and device for a double-fed wind power generation system | |
| CN201829955U (en) | Dynamic voltage stabilizer for helping wind power generator to implement low voltage ride-through | |
| CN104158194B (en) | Voltage stability control method using direct current inverter station as dynamic reactive power source | |
| CN107181278B (en) | Grid-connected inverter high voltage ride through control method based on optimal working point | |
| CN109193766A (en) | A kind of grid-connected fault traversing control method of MMC-HVDC based on DC energy storage device | |
| CN105610175B (en) | Wide-area reactive power coordination control method for FACTS equipment | |
| CN102097825B (en) | Insulated gate bipolar transistor (IGBT) type Crowbar cut-out method of double-fed wind power converter | |
| CN106300415B (en) | A kind of low-voltage ride-through method of brushless dual-feedback wind power generator group combination |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |