CN109995068A - Fault ride-through control apparatus and method - Google Patents
Fault ride-through control apparatus and method Download PDFInfo
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- CN109995068A CN109995068A CN201711479338.XA CN201711479338A CN109995068A CN 109995068 A CN109995068 A CN 109995068A CN 201711479338 A CN201711479338 A CN 201711479338A CN 109995068 A CN109995068 A CN 109995068A
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- 238000000034 method Methods 0.000 title claims abstract description 42
- 230000009123 feedback regulation Effects 0.000 claims abstract description 133
- 238000011084 recovery Methods 0.000 claims description 33
- 230000005611 electricity Effects 0.000 claims description 16
- 238000005259 measurement Methods 0.000 claims description 12
- 238000010586 diagram Methods 0.000 description 19
- 230000006870 function Effects 0.000 description 5
- 238000010248 power generation Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 206010044565 Tremor Diseases 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 230000000881 depressing effect Effects 0.000 description 1
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Classifications
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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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/50—Controlling the sharing of the out-of-phase component
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
- H02P9/006—Means for protecting the generator by using control
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
- H02P9/14—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field
- H02P9/26—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field using discharge tubes or semiconductor devices
- H02P9/30—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field using discharge tubes or semiconductor devices using semiconductor devices
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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
Abstract
The embodiment of the invention discloses a fault ride-through control device and a fault ride-through control method. The method comprises the steps that a first feedback adjusting module outputs a Pulse Width Modulation (PWM) signal for driving an Insulated Gate Bipolar Transistor (IGBT) in a machine side boost circuit of a converter according to a boost current measured value and an initial boost current given value; the control module judges whether the power grid voltage meets a preset dropping condition or not according to the three-phase voltage signal of the power grid, and controls a circuit between the second feedback regulation module and the first feedback regulation module to be connected when the power grid voltage meets the preset dropping condition; the second feedback adjusting module adjusts the initial boost current set value according to an error signal between the measured value of the direct current bus voltage and the direct current bus voltage set value, so that the first feedback adjusting module outputs an updated PWM signal. By adopting the technical scheme in the embodiment of the invention, the long-time heavy-load operation of the braking unit can be avoided, and the failure rate of the braking unit is reduced.
Description
Technical field
The present invention relates to technical field of wind power generation more particularly to a kind of fault traversing control device and methods.
Background technique
During the generated energy of wind power generating set needs to be connected to the grid by current transformer after over commutation.When operation of power networks shakiness
When determining, for example network voltage raising occurs or falls equal electric network faults, the energy being connected to the grid can be made to reduce, be connected to the grid
The reduction meeting of energy is so that generator outlet voltage quickly increases, and then increases rectified voltage, still, wind power generating set
Output power is temporarily to maintain constant, and the uneven meeting of the input and output energy of this current transformer is so that DC bus-bar voltage
It quickly increases, influences the safe operation of wind power generating set.
For the safe operation for guaranteeing wind power generating set, the method for the prior art is that brake unit is arranged in current transformer,
When grid voltage sags, brake unit starts, control IGBT module work, to drive braking resistor to more on DC bus
Complementary energy is discharged, and restores DC bus-bar voltage to normal voltage range.
But the inventors of the present application found that since operation of power networks state is uncontrollable, IGBT module in brake unit and
Braking resistor may need long-time heavy service, and long-time heavy service can make the failure rate of brake unit increase, and one
Denier brake unit breaks down, and can not just discharge to the excess energy on DC bus, influence the peace of wind power generating set
Row for the national games.
Summary of the invention
The embodiment of the invention provides a kind of fault traversing control device and methods, can be avoided brake unit weight for a long time
Carrying row reduces the failure rate of brake unit.
In a first aspect, the embodiment of the invention provides a kind of fault traversing control devices, comprising: control module, first are instead
Present adjustment module and the second feedback regulation module；Wherein,
First feedback regulation module is exported according to boost practical measurement of current value and initial boost given value of current value for driving
The pulse width modulation (PWM) signal of IGBT in the pusher side boost circuit of current transformer；
Control module according to the three-phase voltage signal of power grid, judge network voltage whether meet it is preset fall condition, and
When network voltage meet it is preset fall condition when, control the line between the second feedback regulation module and the first feedback regulation module
Road is connected；
Second feedback regulation module is also according to the mistake between DC bus-bar voltage measured value and DC bus-bar voltage given value
Difference signal is adjusted initial boost given value of current value, and the first feedback regulation module is made to export updated pwm signal, with
DC bus-bar voltage is set during fault traversing to level off to DC bus-bar voltage given value.
In some embodiments of first aspect, control module includes the first arithmetic element, the first judging unit and first
Switch unit；Wherein, first switch unit is set to the route between the first feedback regulation module and the second feedback regulation module
On；First arithmetic element carries out three phase voltages of power grid and three line voltages for the three-phase voltage signal using power grid
Virtual value operation obtains the virtual value of each voltage；First judging unit, for judging whether the virtual value of each voltage is lower than respectively
It is corresponding to fall threshold voltage, and when the virtual value of any one voltage lower than it is corresponding fall threshold voltage when, opened to first
It closes unit and exports first control signal, connect the route between the second feedback regulation module and the first feedback regulation module.
In some embodiments of first aspect, control module further includes second judgment unit, for judging all phase electricity
Whether the virtual value of pressure and line voltage entirely reaches corresponding recovery threshold voltage, and effective when all phase voltages and line voltage
When value entirely reaches corresponding recovery threshold voltage, second control signal is exported to first switch unit, the second feedback is disconnected and adjusts
Save the connection between module and the first feedback regulation module.
In some embodiments of first aspect, control module further includes second switch unit and limiter of speed；Wherein, second
Switch unit is set on the route between the generator of wind power generating set and the first feedback regulation module；Second judgement is single
Member is also used in the predetermined amount of time after all phase voltages and line voltage entirely reach corresponding recovery threshold voltage, to
Second switch unit exports third and controls signal, makes the line between limiter of speed series connection access generator and the first feedback regulation module
Road；And after predetermined time period, to the 4th control signal of second switch unit output, limiter of speed is anti-from generator and first
It is cut off on route between feedback adjustment module.
In some embodiments of first aspect, initial boost given value of current value is the output power of wind power generating set
Ratio between pusher side rectified voltage；Control module further includes third judging unit, for judge pusher side rectified voltage or
Whether DC bus-bar voltage reaches the starting voltage of the brake unit of current transformer, and when pusher side rectified voltage or DC bus electricity
When pressure reaches the starting voltage of brake unit, output makes the control signal of brake unit starting.
In some embodiments of first aspect, which further includes third feedback regulation module,
Four feedback regulation modules and phaselocked loop；Wherein, third feedback regulation module is according to DC bus-bar voltage measured value and DC bus
Error signal between voltage given value exports the watt current given value of power grid；4th feedback regulation module is according to power grid
The three-phase current actual measurement of watt current given value, external electrical network reactive current given value, the phase value of phaselocked loop output and power grid
It is worth, the pwm signal of the IGBT in output driving current transformer；Control module obtains power grid also according to the three-phase voltage signal of power grid
The positive-sequence component of voltage, and the positive-sequence component based on network voltage, current transformer needs the nothing that issues during calculating fault traversing
Function given value of current value, and when network voltage meet it is preset fall condition when, using current transformer need the reactive current that issues to
Definite value updates external electrical network reactive current given value；4th feedback regulation module also according to power grid watt current given value, become
Reactive current given value, the phase value of phaselocked loop output and the three-phase current measured value of power grid that stream device needs to issue, output is more
Pwm signal after new, so that the reactive power that current transformer exports during fault traversing meets the reactive requirement of power grid.
In some embodiments of first aspect, control module further includes the second arithmetic element and third switch unit；Its
In, the second arithmetic element obtains the positive-sequence component of network voltage for the three-phase voltage signal according to power grid, and according to power grid electricity
The positive-sequence component of pressure, current transformer needs the reactive current given value that issues during calculating fault traversing；Third switch unit is set
It is placed on the route between the second arithmetic element and the 4th feedback regulation module；First judging unit is also used to when any one
The virtual value of voltage lower than it is corresponding fall threshold voltage when, to third switch unit output the 5th control signal, connect second
Route between arithmetic element and the 4th feedback regulation module, pause external electrical network reactive current given value give, and will become
Stream device needs the reactive current given value issued as new reactive current given value.
In some embodiments of first aspect, second judgment unit is also used to having when all phase voltages and line voltage
When valid value entirely reaches corresponding recovery threshold voltage, to the 6th control signal of third switch unit output, the second feedback is disconnected
Connection between adjustment module and the first feedback regulation module, and restore the given of external electrical network reactive current given value.
In some embodiments of first aspect, control module further includes limiter, and limiter is set to third and adjusts mould
On route between block and the 4th adjustment module.
Second aspect, the embodiment of the invention provides a kind of fault traversing control methods, comprising:
By the first feedback regulation module according to boost practical measurement of current value and initial boost given value of current value, export for driving
The pwm signal of IGBT in the pusher side boost circuit of dynamic current transformer；
Network voltage meet it is preset fall condition when, control the second feedback regulation module and the first feedback regulation module
Between route connect；
By the second feedback regulation module also according between DC bus-bar voltage measured value and DC bus-bar voltage given value
Error signal is adjusted initial boost given value of current value, and the first feedback regulation module is made to export updated pwm signal,
So that DC bus-bar voltage levels off to DC bus-bar voltage given value during fault traversing.
In some embodiments of second aspect, according to the three-phase voltage signal of power grid, judge whether network voltage meets
Preset condition of falling includes: to have using the three-phase voltage signal of power grid to three phase voltages of power grid and three line voltages
Valid value operation obtains the virtual value of each voltage；Judge respectively the virtual value of each voltage whether be lower than it is corresponding fall threshold voltage,
When the virtual value of any one voltage lower than it is corresponding fall threshold voltage when, determine that wind power generating set is in fault traversing work
Condition.
In some embodiments of second aspect, the fault traversing control method further include: judge all phase voltages and line
Whether the virtual value of voltage entirely reaches corresponding recovery threshold voltage, when the virtual value of all phase voltages and line voltage all reaches
When to corresponding recovery threshold voltage, the connection between the second feedback regulation module and the first feedback regulation module is disconnected.
In some embodiments of second aspect, the fault traversing control method further include: in all phase voltages and line electricity
It presses in the predetermined amount of time after entirely reaching corresponding recovery threshold voltage, makes limiter of speed series connection access generator and first instead
Present the route between adjustment module；And after predetermined time period, by limiter of speed from generator and the first feedback regulation module it
Between route on cut off.
In some embodiments of second aspect, the fault traversing control method, initial boost given value of current value is wind-force
Ratio between the output power and pusher side rectified voltage of generating set；The fault traversing control method further include: judge pusher side
Whether rectified voltage reaches the starting voltage of the brake unit of current transformer, when pusher side rectified voltage reaches the starting electricity of brake unit
When pressure, output makes the control signal of brake unit starting.
In some embodiments of second aspect, the fault traversing control method further include: by third feedback regulation module
According to the error signal between DC bus-bar voltage measured value and DC bus-bar voltage given value, export the watt current of power grid to
Definite value；Watt current given value, external electrical network reactive current given value, phaselocked loop by the 4th feedback regulation module according to power grid
The phase value of output and the three-phase current measured value of power grid, the pwm signal of the IGBT in output driving current transformer；According to power grid
Three-phase voltage signal obtains the positive-sequence component of network voltage, and the positive-sequence component based on network voltage, calculates fault traversing process
Middle current transformer needs the reactive current given value issued, and when network voltage meet it is preset fall condition when, suspend external electrical
Net reactive current given value gives, and needs the reactive current given value issued to give as new reactive current in current transformer
Value；Watt current given value, current transformer by the 4th feedback regulation module also according to power grid need the reactive current issued to give
The three-phase current measured value of value, the phase value of phaselocked loop output and power grid, exports updated pwm signal, so that fault traversing
The reactive power of current transformer output meets the reactive requirement of power grid in the process.
In some embodiments of second aspect, the fault traversing control method further include: judge all phase voltages and line
Whether the virtual value of voltage entirely reaches corresponding recovery threshold voltage, and when the virtual value of all phase voltages and line voltage is whole
When reaching corresponding recovery threshold voltage, stops the given of the reactive current given value that current transformer needs to issue, restore external electrical
Net reactive current given value gives.
According to an embodiment of the invention, when network voltage breaks down, i.e., preset fall condition when network voltage meets
When, the route between the second feedback regulation module and the first feedback regulation module can be connected, by the second feedback regulation module benefit
With DC bus-bar voltage measured value UdcWith DC bus-bar voltage given value Udc* the error signal between gives initial boost electric current
Definite value Iboost* it is adjusted, and by boost given value of current value I adjustedboost* is input to the first feedback regulation module, makes
Obtaining the first feedback regulation module can be according to boost practical measurement of current value IboostWith boost given value of current value I adjustedboost**
Between difference, export updated pwm signal.
Due to boost given value of current value I adjustedboost* is related to the DC bus-bar voltage during fault traversing,
The electric network state being able to reflect during fault traversing is used to drive the pusher side boost of current transformer using updated pwm signal
IGBT work in circuit, it will be able to so as to level off to DC bus-bar voltage given for DC bus-bar voltage during fault traversing
Value.
Compared with the IGBT module in the prior art needed in brake unit and braking resistor long-time heavy service, this
The second feedback regulation module in inventive embodiments can be from adjustment boost given value of current value IboostThe angle of * is set out, adjustment
DC bus-bar voltage during fault traversing, those skilled in the art can control the fault traversing in the embodiment of the present invention
Device is used alone, or is used in combination with brake unit to reduce the failure rate of brake unit, to slow down brake unit
Rate of ageing guarantees the safety of wind power generation set grid-connection operation.
Detailed description of the invention
The present invention may be better understood from the description with reference to the accompanying drawing to a specific embodiment of the invention wherein,
The same or similar appended drawing reference indicates the same or similar feature.
Fig. 1 is the schematic diagram of the grid connected structure of wind power generating set provided in an embodiment of the present invention；
Fig. 2 is the structural schematic diagram for the fault traversing control device that first embodiment of the invention provides；
Fig. 3 is the structural schematic diagram for the fault traversing control device that second embodiment of the invention provides；
Fig. 4 is the structural schematic diagram for the fault traversing control device that third embodiment of the invention provides；
Fig. 5 is the structural schematic diagram for the fault traversing control device that fourth embodiment of the invention provides；
Fig. 6 is the structural schematic diagram for the fault traversing control device that fifth embodiment of the invention provides；
Fig. 7 is the structural schematic diagram for the fault traversing control device that sixth embodiment of the invention provides；
Fig. 8 is the flow diagram for the fault traversing control method that one embodiment of the invention provides；
Fig. 9 be another embodiment of the present invention provides fault traversing control method flow diagram.
Description of symbols:
101- rectifier；102-boost circuit；103- current transformer；201- control module；
The first arithmetic element of 2011-；The first judging unit of 2012-；2013 first switch units；
2014- second switch unit；2015- limiter of speed；The second arithmetic element of 2016-；
2017- third switch unit；202- the first feedback regulation module；
203- the second feedback regulation module；501- third feedback regulation module；
The 4th feedback regulation module of 502-；503- phaselocked loop.
Specific embodiment
The feature and exemplary embodiment of the various aspects of the embodiment of the present invention is described more fully below.Following detailed
In description, many details are proposed, in order to provide the comprehensive understanding to the embodiment of the present invention.
The embodiment of the present invention provides a kind of fault traversing control device and method.Using the method energy in the embodiment of the present invention
The brake unit long-time heavy service of current transformer is enough avoided, so that the failure rate of brake unit is reduced, and grid collapses,
For example when the severely subnormals situation such as generation imbalance is fallen or increased, voltage waveform distortion, it can guarantee wind power generating set
Grid-connected current is fully controllable, and system is made to have good grid-connected friendly.
Fig. 1 is the schematic diagram of the grid connected structure of wind power generating set provided in an embodiment of the present invention.As shown in Figure 1, wind-force
Rectifier 101, boost circuit 102 and current transformer 103 are disposed between generating set and power grid.
Wherein, rectifier 101 be used for wind power generating set power generation generate three-phase alternating current rectify, then by
The DC supply input that boost circuit 102 exports rectifier 101 is to current transformer 103, then by current transformer 103 by boost circuit
The direct current of 102 inputs is converted to three-phase alternating current again and is connected to the grid.Wherein, the IGBT104 module in current transformer 103 is also referred to as
For power module, for specifically executing the operation that direct current is converted to three-phase alternating current.Wind power generating set shown in Fig. 1
Generator is magneto alternator PMSG.
Fig. 2 is the structural schematic diagram for the fault traversing control device that first embodiment of the invention provides.Event shown in Figure 2
It includes control module 201, the first feedback regulation module 202 and the second feedback regulation module 203 that barrier, which passes through control device,.
Wherein, the first feedback regulation module 202 is according to boost practical measurement of current value IboostWith initial boost given value of current value
Iboost*, the pulse width modulation (PWM) signal of the IGBT in pusher side boost circuit of the output for driving current transformer.
Control module 201 is according to the three-phase voltage signal (U of power grida, Ub, Uc), it is preset to judge whether network voltage meets
Fall condition, and when network voltage meet it is preset fall condition when, the second feedback regulation module of control 203 and the first feedback are adjusted
The route saved between module 202 is connected.
Second feedback regulation module 203 is also according to DC bus-bar voltage measured value UdcWith DC bus-bar voltage given value Udc*
Between error signal, to initial boost given value of current value Iboost* it is adjusted, makes the output of the first feedback regulation module 202 more
Pwm signal after new, so that DC bus-bar voltage levels off to DC bus-bar voltage given value during fault traversing.
According to an embodiment of the invention, the first feedback regulation module 202 can be lasting starting, the first feedback regulation is utilized
Module 202 is according to boost practical measurement of current value IboostWith initial boost given value of current value Iboost* the difference between, output are used for
The pwm signal for driving the IGBT in the pusher side boost circuit of current transformer can carry out boost electric current to continue fine tuning, stablize and become
Flow the input current of device.
When network voltage breaks down, i.e., when network voltage meet it is preset fall condition when, the second feedback can be connected
Route between adjustment module 203 and the first feedback regulation module 202 utilizes DC bus by the second feedback regulation module 203
Voltage measured value UdcWith DC bus-bar voltage given value Udc* the error signal between is to initial boost given value of current value Iboost*
It is adjusted, and by boost given value of current value I adjustedboost* is input to the first feedback regulation module 202, so that first
Feedback regulation module 202 can be according to boost practical measurement of current value IboostWith boost given value of current value I adjustedboost* it
Between difference, export updated pwm signal.
Due to boost given value of current value I adjustedboost* is related to the DC bus-bar voltage during fault traversing,
The electric network state being able to reflect during fault traversing is used to drive the pusher side boost of current transformer using updated pwm signal
IGBT work in circuit, it will be able to so as to level off to DC bus-bar voltage given for DC bus-bar voltage during fault traversing
Value.
Compared with the IGBT module in the prior art needed in brake unit and braking resistor long-time heavy service, this
The second feedback regulation module 203 in inventive embodiments can be from adjustment boost given value of current value IboostThe angle of * is set out, and is adjusted
DC bus-bar voltage during whole fault traversing, those skilled in the art can be by the fault traversing controls in the embodiment of the present invention
Device processed is used alone, or is used in combination with brake unit to reduce the failure rate of brake unit, to slow down brake unit
Rate of ageing, guarantee wind power generation set grid-connection operation safety.
Fig. 3 is the structural schematic diagram for the fault traversing control device that second embodiment of the invention provides.Fig. 3 and Fig. 2 are not
It is with place, the control module 201 in Fig. 2 includes the first arithmetic element 2011, the first judging unit 2012 and first switch
Unit 2013.
Wherein, first switch unit 2013 be set to the first feedback regulation module 202 and the second feedback regulation module 203 it
Between route on；
First arithmetic element 2011 is used for the three-phase voltage signal (U using power grida, Ub, Uc) to three phase voltages of power grid
Virtual value operation is carried out with three line voltages, obtains the virtual value of each voltage；
First judging unit 2012, for judge respectively the virtual value of each voltage whether be lower than it is corresponding fall threshold value electricity
Pressure, and when the virtual value of any one voltage lower than it is corresponding fall threshold voltage when, to the output of first switch unit 2,013 the
One control signal, with the route connected between the second feedback regulation module 203 and the first feedback regulation module 202.
As shown in figure 3, the specific implementation form of first switch unit 2013 can be multicontact switch, when power grid is normally transported
When row, stationary contact is connect with the flag bit flag movable contact for being 0 in multicontact switch, when the grid fails, in multicontact switch
Stationary contact is connect with the flag bit flag movable contact for being 1, connects the second feedback regulation module 203 and the first feedback regulation module
Route between 202, to utilize DC bus-bar voltage measured value UdcWith DC bus-bar voltage given value Udc* the error letter between
Number to initial boost given value of current value Iboost* it is adjusted, and by boost given value of current value I adjustedboost* is input to
First feedback regulation module 202 enables the first feedback regulation module 202 according to boost practical measurement of current value IboostAnd adjustment
Boost given value of current value I afterwardsboostDifference between * exports updated pwm signal.
According to an embodiment of the invention, control module 201 further includes second judgment unit (not shown), for judging
Whether the virtual value of all phase voltages and line voltage entirely reaches corresponding recovery threshold voltage, and when all phase voltages and line electricity
When the virtual value of pressure entirely reaches corresponding recovery threshold voltage, second control signal is exported to first switch unit 2013, with
Disconnect the connection between the second feedback regulation module 203 and the first feedback regulation module 202.
Wherein, fall threshold voltage for indicating the drop depth of network voltage, falling threshold voltage can be with recovery threshold
Threshold voltage is equal, might be less that recovery threshold voltage.Restore threshold voltage for indicating that network voltage has been restored to normal work
Make under voltage.
The virtual value of network voltage can be used to judge in the identification that power grid falls, such as when voltage is electric lower than working normally
When depressing limit value 0.9pu, then it is assumed that have the case where power grid falls.But in order to improve anti-interference ability, can also suitably by
Lower limit value is turned down.
In one example, virtual value can be calculated to three phase voltages, three line voltages respectively, successively by six voltages
Compared with lower threshold voltage, electrical network low voltage is concluded if at least one is lower than threshold value.
Fig. 4 is the structural schematic diagram for the fault traversing control device that third embodiment of the invention provides.Fig. 4 and Fig. 3 are not
It is with place, 201 second switch unit 2014 of control module and limiter of speed 2015 in Fig. 4.
Wherein, second switch unit 2014 is set to the generator and the first feedback regulation module 202 of wind power generating set
Between route on.
In voltage recovery process, to prevent grid-connected chugging from causing to impact to current transformer, second judgment unit is also used
In all phase voltages and line voltage entirely reach it is corresponding recovery threshold voltage after predetermined amount of time in, to second switch
Unit 2014 exports third and controls signal, makes between the series connection of limiter of speed 2015 access generator and the first feedback regulation module 202
Route；And after predetermined time period, to the 4th control signal of the output of second switch unit 2014, by limiter of speed 2015 from hair
It is cut off on route between motor and the first feedback regulation module 202.
As shown in figure 4, the specific implementation form of second switch unit 2014 can be multicontact switch, when in all phase electricity
It presses in the predetermined amount of time after entirely reaching corresponding recovery threshold voltage with line voltage, stationary contact and mark in multicontact switch
Will position flag be (1-0) movable contact connect, make limiter of speed 2015 series connection access generator and the first feedback regulation module 202 it
Between route；When after predetermined time period, stationary contact and flag bit flag are that the movable contact of (0,1) connects in multicontact switch
It connects, limiter of speed 2015 is cut off on the route between generator and the first feedback regulation module 202.
According to an embodiment of the invention, adding speed limits device " limiter of speed 2015 " after boost given value of current, it can
So that boost given value of current value Iboost* slowly restore, boost given value of current value Iboost* approximate with the input power of current transformer
It is directly proportional, it can to restore input power slowly, then net side power is also gradually recovered.It can avoid using the above control strategy
Voltage recovery causes strong impact to current transformer, improves the stability of wind power generation set grid-connection operation.
In one example, as shown in figure 4, initial boost given value of current value IboostIt * can be the defeated of wind power generating set
Power P outelec* with pusher side rectified voltage UrecBetween ratio.
Due to the operation characteristic of wind power generating set, during reducing boost electric current, pusher side rectified voltage UrecAnd
It will not remain unchanged, but have a degree of raising.If pusher side rectified voltage UrecHigher than the given value of DC bus
Afterwards, boost circuit can be made uncontrolled, causes the input power of current transformer also uncontrolled, DC bus-bar voltage can follow rectification
Voltage is increased and is increased, and power balancing algorithm can also fail.
Control module 201 further includes third judging unit (not shown), for judging pusher side rectified voltage UrecOr
DC bus-bar voltage UdcWhether reach the starting voltage of the brake unit of current transformer, and works as pusher side rectified voltage UrecOr direct current
Busbar voltage UdcWhen reaching the starting voltage of brake unit, output makes the control signal of brake unit starting.In brake unit
Braking resistor starts to act, and finally makes pusher side rectified voltage UrecStablize near starting voltage.This method is only in current transformer
Input power compared to output power it is especially big when brake unit just will start, when difference is smaller reduction boost electric current be enough to make
The power-balance of current transformer.
In addition, standard provides that current transformer should be able to issue certain reactive power during Voltage Drop, to help power grid extensive
It is multiple.To reactive power control can equivalent pairs of reactive current control.For example, the standard requirements reactive current response time is little
In 75ms, the duration is not less than 550ms.
Fig. 5 is the structural schematic diagram for the fault traversing control device that fourth embodiment of the invention provides.Fig. 5 and Fig. 2 are not
It is with place, the fault traversing control device in Fig. 5 further includes third feedback regulation module 501, the 4th feedback regulation module
502 and phaselocked loop 503, for meeting idle requirement as defined in standard.
Wherein, third feedback regulation module 501 is according to DC bus-bar voltage measured value UdcWith DC bus-bar voltage given value
Udc* the error signal between exports the watt current given value I of power gridd*。
4th feedback regulation module 502 is according to the watt current given value I of power gridd*, external electrical network reactive current given value
Iq*, the three-phase current measured value (I of phaselocked loop 503 exports phase value θ and power grida, Ib, Ic), in output driving current transformer
The pwm signal of IGBT；
Three-phase voltage signal (U of the control module 201 also according to power grida, Ub, Uc), obtain the positive-sequence component U of network voltaged +, and the positive-sequence component U based on network voltaged +The reactive current given value that current transformer needs to issue during calculating fault traversing
Iq*, and when network voltage meet it is preset fall condition when, need the reactive current given value I that issues using current transformerq* is more
New external electrical network reactive current given value Iq*；
Watt current given value I of the 4th feedback regulation module 502 also according to power gridd*, current transformer needs issue idle
Given value of current value IqThree-phase current measured value (the I of *, the phase value θ that phaselocked loop 503 exports and power grida, Ib, Ic), output updates
Pwm signal afterwards, so that the reactive power that current transformer exports during fault traversing meets the reactive requirement of power grid.
Wherein, phaselocked loop 503 can be by the three-phase voltage (U of power grida, Ub, Uc) by abc rest frame to transform to dq same
It walks under rotating coordinate system, and is adjusted by the closed loop in locking phase and eliminate q axis component, dq coordinate system rotation angle at this time is electricity
The true phase of net voltage, this method are highly effective to symmetrical power grid.
When asymmetrical three-phase occurs for power grid, it is contemplated that power grid asymmetry is practically due to three-phase voltage while containing
Positive sequence and negative sequence component, therefore, it is possible to use filter negative sequence component is filtered out after operation again, while filter also can be used
Phase calculation is carried out after higher hamonic wave is eliminated, again to increase the stability of output phase.
In order to improve response speed and tracking accuracy, reactive current can be controlled using PID regulator, it will be grid-connected
Electric current (Ia, Ib, Ic) decoupling obtain reactive current component.Current transformer needs the reactive current given value I issuedqIt * and decouples
The reactive current component arrived enters closed-loop regulator, the PWM letter of the IGBT in PID regulator output driving current transformer more afterwards
Number, then participate in the adjusting of grid-connected current.
Specifically, it can use the minimum reactive current given value that formula (1) calculates power grid needs during fault traversing
Iqmin*:
Iqmin*=1.5 × (0.9-UT +)×IN (1)
Wherein, UT +Given, the I for reactive current per unit valueNJust for voltage on line side positive-sequence component per unit value, i.e. network voltage
Order components Ud +Per unit value.
As shown in figure 5, control module 201 further includes the second arithmetic element 2016 and third switch unit 2017.
Wherein, the second arithmetic element 2016 is used for the three-phase voltage signal (U according to power grida, Ub, Uc) obtain network voltage
Positive-sequence component Ud +, and according to the positive-sequence component U of network voltaged +The nothing that current transformer needs to issue during calculating fault traversing
Function given value of current value Iq**。
Third switch unit 2017 is set to the route between the second arithmetic element 2016 and the 4th feedback regulation module 502
On.First judging unit 2012 be also used to when the virtual value of any one voltage lower than it is corresponding fall threshold voltage when, to the
The 5th control signal of three switch units 2017 output, is connected between the second arithmetic element 2016 and the 4th feedback regulation module 502
Route, suspend external electrical network reactive current given value Iq* reactive current given value given, and that current transformer is needed to issue
Iq* is as new reactive current given value.
As shown in figure 5, the specific implementation form of first switch unit 2013 can be multicontact switch, when power grid is normally transported
When row, stationary contact is connect with the flag bit flag movable contact for being 0 in multicontact switch, receives the 4th feedback regulation module 502
External electrical network reactive current given value Iq*；When the grid fails, in multicontact switch stationary contact and flag bit flag be 1 it is dynamic
Contact connection, connects the route between the second arithmetic element 2016 and the 4th feedback regulation module 502, with suspend external electrical network without
Function given value of current value Iq* reactive current given value I given, and that current transformer is needed to issueq* gives as new reactive current
Definite value.
According to an embodiment of the invention, second judgment unit is also used to judge that the virtual value of all phase voltages and line voltage is
It is no to entirely reach corresponding recovery threshold voltage, and when the virtual value of all phase voltages and line voltage entirely reaches corresponding recovery
When threshold voltage, to the 6th control signal of the output of third switch unit 2017, it is anti-to disconnect the second feedback regulation module 203 and first
The connection between adjustment module 202 is presented, and restores the given I of external electrical network reactive current given valueq*。
According to an embodiment of the invention, control module 201 can also include limiter (referring to the limiter in Fig. 6), limit
Width device is set on the route between third adjustment module and the 4th adjustment module, for limiting the electricity of third adjustment module output
The watt current given value I of netd*.When energy surplus on DC bus, the watt current given value I of power gridd* can gradually become
It greatly, can be in the maximum given value I of limiter setting watt currentdmax*, i.e. the maximum current that can bear of current transformer, to prevent
The only watt current given value I of power gridd* excessive, cause current transformer that over current fault occurs.
Fig. 6 is the structural schematic diagram for the fault traversing control device that fifth embodiment of the invention provides, for the present invention
Fault traversing control device in embodiment is illustrated, in order to understand the technical solution in the embodiment of the present invention.
As shown in fig. 6, the first feedback regulation module 202 is IboostAdjuster, the second feedback regulation module 203 are UdcIt is auxiliary
Adjuster is helped, third feedback regulation module 501 is UdcAuxiliary governor, the 4th feedback regulation module 502 are IabcAdjuster has
Valid value calculator is used for the three-phase voltage signal (U using power grida, Ub, Uc) to three phase voltages of power grid and three line voltages into
Row virtual value operation, obtains the virtual value of each voltage, FUN function module be used to calculate reactive current that current transformer needs to issue to
Definite value Iq**。
Wherein, IboostAdjuster is according to boost practical measurement of current value IboostWith initial boost given value of current value Iboost*, defeated
Out for driving the pulse width modulation (PWM) signal of the IGBT in the pusher side boost circuit of current transformer.
When network voltage meet it is preset fall condition when, UdcAuxiliary governor and IboostRoute between adjuster connects
It is logical, so that IboostAdjuster is also according to DC bus-bar voltage measured value UdcWith DC bus-bar voltage given value Udc* the error between
Signal, to initial boost given value of current value Iboost* it is adjusted, exports updated pwm signal, so that fault traversing process
Middle DC bus-bar voltage levels off to DC bus-bar voltage given value.
Fig. 7 is the structural schematic diagram for the fault traversing control device that sixth embodiment of the invention provides, for showing to this
Fault traversing control device after technical solution in inventive embodiments is expanded.Fig. 7 the difference from Fig. 6 is that, in Fig. 6
Rectifier be diode rectifier, the rectifier in Fig. 7 is full-controlled rectifier device, that is, as net side comprising IGBT
PWM converter, full-controlled rectifier device control the power absorbed from generator by can control torque.
In the example in figure 7, torque controller is exported according to torque measured value T and initial moment given value T* for driving
The pulse width modulation (PWM) signal of IGBT in the pusher side boost circuit of dynamic current transformer.When network voltage meets preset fall
When condition, UdcRoute between auxiliary governor and torque controller is connected, so that torque controller is also according to DC bus electricity
It is compacted measured value UdcWith DC bus-bar voltage given value Udc* the error signal between is adjusted initial moment given value T*,
Updated pwm signal is exported, so that DC bus-bar voltage levels off to DC bus-bar voltage given value during fault traversing.
Fig. 8 is the flow diagram for the fault traversing control method that one embodiment of the invention provides, failure shown in Fig. 8
Traversing control method includes step 801 to step 806.
In step 801, by the first feedback regulation module according to boost practical measurement of current value and initial boost given value of current
Value exports the pulse width modulation (PWM) signal of the IGBT in the pusher side boost circuit for driving current transformer.
In step 802, according to the three-phase voltage signal of power grid, judge whether network voltage meets and preset fall item
Part, and when network voltage meet it is preset fall condition when, control the second feedback regulation module and the first feedback regulation module it
Between route connect.
Specifically, judge whether network voltage meets preset condition of falling and can wrap according to the three-phase voltage signal of power grid
It includes: virtual value operation being carried out to three phase voltages of power grid and three line voltages using the three-phase voltage signal of power grid, is obtained each
The virtual value of voltage；Then judge respectively the virtual value of each voltage whether be lower than it is corresponding fall threshold voltage, when any one
The virtual value of voltage lower than it is corresponding fall threshold voltage when, determine that wind power generating set is in fault traversing operating condition.
In step 803, by the second feedback regulation module also according to DC bus-bar voltage measured value and DC bus-bar voltage
Error signal between given value is adjusted initial boost given value of current value, updates the output of the first feedback regulation module
Pwm signal afterwards, so that DC bus-bar voltage levels off to DC bus-bar voltage given value during fault traversing.
In step 804, judge whether the virtual value of all phase voltages and line voltage entirely reaches corresponding recovery threshold value
Voltage disconnects the second feedback and adjusts when the virtual value of all phase voltages and line voltage entirely reaches corresponding recovery threshold voltage
Save the connection between module and the first feedback regulation module.
In step 805, predetermined after all phase voltages and line voltage entirely reach corresponding recovery threshold voltage
In period, make the route between limiter of speed series connection access generator and the first feedback regulation module；And predetermined amount of time it
Afterwards, it is cut off on the route by limiter of speed between generator and the first feedback regulation module.
In step 806, judge whether pusher side rectified voltage reaches the starting voltage of the brake unit of current transformer, work as pusher side
When rectified voltage reaches the starting voltage of brake unit, output makes the control signal of brake unit starting.
Fig. 9 be another embodiment of the present invention provides fault traversing control method flow diagram, it is different from Fig. 8's it
Being in, fault traversing control method shown in Fig. 9 further includes step 807 to step 806 to step 811.
In step 807, given by third feedback regulation module according to DC bus-bar voltage measured value and DC bus-bar voltage
Error signal between definite value exports the watt current given value of power grid.
In step 808, by the 4th feedback regulation module according to the watt current given value of power grid, external electrical network is idle electricity
Flow the three-phase current measured value of given value, the phase value of phaselocked loop output and power grid, the PWM of the IGBT in output driving current transformer
Signal.
In step 809, according to the three-phase voltage signal of power grid, the positive-sequence component of network voltage is obtained, and is based on power grid
The positive-sequence component of voltage, current transformer needs the reactive current given value that issues during calculating fault traversing, and works as network voltage
Meet preset when falling condition, the nothing given, and that current transformer is needed to issue of pause external electrical network reactive current given value
Function given value of current value is as new reactive current given value.
In step 810, watt current given value, the current transformer by the 4th feedback regulation module also according to power grid need to send out
Reactive current given value, the phase value of phaselocked loop output and the three-phase current measured value of power grid out, export updated PWM letter
Number, so that the reactive power that current transformer exports during fault traversing meets the reactive requirement of power grid.
In step 811, judge whether the virtual value of all phase voltages and line voltage entirely reaches corresponding recovery threshold value
Voltage, and when the virtual value of all phase voltages and line voltage entirely reaches corresponding recovery threshold voltage, stopping current transformer needing
The reactive current given value to be issued gives, and restores the given of external electrical network reactive current given value.
It should be clear that all the embodiments in this specification are described in a progressive manner, each embodiment it
Between the same or similar part may refer to each other, the highlights of each of the examples are it is different from other embodiments it
Place.For device embodiment, related place may refer to the declaratives of embodiment of the method.Not office of the embodiment of the present invention
It is limited to particular step and structure described above and shown in figure.Those skilled in the art can understand the present invention in fact
Apply be variously modified after the spirit of example, modification and addition, or the sequence between changing the step.Also, it is risen in order to concise
See, omits the detailed description to known method technology here.
Functional block shown in structures described above block diagram can be implemented as hardware, software, firmware or their group
It closes.When realizing in hardware, it may, for example, be electronic circuit, specific integrated circuit (ASIC), firmware appropriate, insert
Part, function card etc..When being realized with software mode, the element of the embodiment of the present invention is used to execute the program of required task
Or code segment.Perhaps code segment can store in machine readable media program or the data by carrying in carrier wave are believed
It number is sent in transmission medium or communication links." machine readable media " may include be capable of storage or transmission information any
Medium.The example of machine readable media includes electronic circuit, semiconductor memory devices, ROM, flash memory, erasable ROM
(EROM), floppy disk, CD-ROM, CD, hard disk, fiber medium, radio frequency (RF) link, etc..Code segment can via such as because
The computer network of special net, Intranet etc. is downloaded.
The embodiment of the present invention can be realized in other specific forms, without departing from its spirit and essential characteristics.For example, special
Determining algorithm described in embodiment can be modified, and system architecture is without departing from the substantially smart of the embodiment of the present invention
Mind.Therefore, current embodiment is all counted as being exemplary rather than limited, the model of the embodiment of the present invention in all respects
It encloses by appended claims rather than foregoing description defines, also, falls into the meaning of claim and complete in the range of equivalent
Portion changes all to be included among the range of the embodiment of the present invention.
Claims (16)
1. a kind of fault traversing control device characterized by comprising control module, the first feedback regulation module and second are anti-
Present adjustment module；Wherein,
The first feedback regulation module is exported according to boost practical measurement of current value and initial boost given value of current value for driving
The pulse width modulation (PWM) signal of IGBT in the pusher side boost circuit of current transformer；
The control module network voltage meet it is preset fall condition when, control the second feedback regulation module and described
Route between first feedback regulation module is connected；
The second feedback regulation module is also according to the mistake between DC bus-bar voltage measured value and DC bus-bar voltage given value
Difference signal is adjusted the initial boost given value of current value, keeps the first feedback regulation module output updated
Pwm signal, so that DC bus-bar voltage levels off to the DC bus-bar voltage given value during fault traversing.
2. the apparatus according to claim 1, which is characterized in that the control module is sentenced including the first arithmetic element, first
Disconnected unit and first switch unit；Wherein,
The first switch unit is set to the line between the first feedback regulation module and the second feedback regulation module
On the road；
First arithmetic element, for the three-phase voltage signal using the power grid to three phase voltages of the power grid and three
A line voltage carries out virtual value operation, obtains the virtual value of each voltage；
First judging unit, for judge respectively the virtual value of each voltage whether be lower than it is corresponding fall threshold voltage, and
When the virtual value of any one voltage lower than it is corresponding fall threshold voltage when, Xiang Suoshu first switch unit output first control
Signal connects the route between the second feedback regulation module and the first feedback regulation module.
3. the apparatus of claim 2, which is characterized in that the control module further includes second judgment unit, is used for
Judge whether the virtual value of all phase voltages and line voltage entirely reaches corresponding recovery threshold voltage, and when all phase voltages and
When the virtual value of line voltage entirely reaches corresponding recovery threshold voltage, Xiang Suoshu first switch unit output the second control letter
Number, disconnect the connection between the second feedback regulation module and the first feedback regulation module.
4. device according to claim 3, which is characterized in that the control module further includes second switch unit and speed limit
Device；Wherein,
The second switch unit is set to the line between the generator of wind power generating set and the first feedback regulation module
On the road；
The second judgment unit is also used to after all phase voltages and line voltage entirely reach corresponding recovery threshold voltage
Predetermined amount of time in, Xiang Suoshu second switch unit exports third and controls signal, and limiter of speed series connection is made to access the hair
Route between motor and the first feedback regulation module；And it is described after a predetermined period of time, Xiang Suoshu second switch list
The 4th control signal of member output, by the limiter of speed on the route between the generator and the first feedback regulation module
Excision.
5. the apparatus according to claim 1, which is characterized in that the initial boost given value of current value is wind-driven generator
Ratio between the output power and pusher side rectified voltage of group；
The control module further includes third judging unit, for judging the pusher side rectified voltage or DC bus-bar voltage is
The starting voltage of the no brake unit for reaching current transformer, and when the pusher side rectified voltage or DC bus-bar voltage reach described
When the starting voltage of brake unit, output makes the control signal of the brake unit starting.
6. device according to claim 3, which is characterized in that described device further includes third feedback regulation module, the 4th
Feedback regulation module and phaselocked loop；Wherein,
The third feedback regulation module according to the DC bus-bar voltage measured value and the DC bus-bar voltage given value it
Between error signal, export the watt current given value of the power grid；
The 4th feedback regulation module according to the watt current given value of the power grid, external electrical network reactive current given value,
The phase value of phaselocked loop output and the three-phase current measured value of the power grid, the PWM of the IGBT in output driving current transformer
Signal；
The control module obtains the positive-sequence component of network voltage also according to the three-phase voltage signal of the power grid, and is based on institute
It states the positive-sequence component of network voltage, calculates the reactive current given value that the current transformer during fault traversing needs to issue, and
When the network voltage meet it is preset fall condition when, need the reactive current given value that issues to update using the current transformer
The external electrical network reactive current given value；
The nothing that the 4th feedback regulation module needs to issue also according to watt current given value, the current transformer of the power grid
The three-phase current measured value of function given value of current value, the phase value of phaselocked loop output and the power grid, exports updated PWM
Signal, so that the reactive power of the current transformer output meets the reactive requirement of the power grid during fault traversing.
7. device according to claim 6, which is characterized in that the control module further includes the second arithmetic element and third
Switch unit；Wherein,
Second arithmetic element, for obtaining the positive-sequence component of network voltage according to the three-phase voltage signal of the power grid, and
According to the positive-sequence component of the network voltage, the reactive current that the current transformer needs to issue during calculating fault traversing is given
Value；
The third switch unit is set on the route between second arithmetic element and the 4th feedback regulation module；
First judging unit, be also used to when the virtual value of any one voltage lower than it is corresponding fall threshold voltage when, to
The 5th control signal of third switch unit output, connect second arithmetic element and the 4th feedback regulation module it
Between route, pause external electrical network reactive current given value it is given, and the reactive current that the current transformer is needed to issue to
Definite value is as new reactive current given value.
8. device according to claim 7, which is characterized in that the second judgment unit is also used to when all phase voltages
When entirely reaching corresponding recovery threshold voltage with the virtual value of line voltage, the 6th control letter of Xiang Suoshu third switch unit output
Number, disconnect the connection between the second feedback regulation module and the first feedback regulation module, and restore external electrical network without
Function given value of current value gives.
9. device according to claim 6, which is characterized in that the control module further includes limiter, the limiter
It is set on the route between the third adjustment module and the 4th adjustment module.
10. a kind of fault traversing control method characterized by comprising
By the first feedback regulation module according to boost practical measurement of current value and initial boost given value of current value, output becomes for driving
Flow the pwm signal of the IGBT in the pusher side boost circuit of device；
Network voltage meet it is preset fall condition when, control the second feedback regulation module and the first feedback regulation module
Between route connect；
By the second feedback regulation module also according between DC bus-bar voltage measured value and DC bus-bar voltage given value
Error signal is adjusted the initial boost given value of current value, keeps the first feedback regulation module output updated
Pwm signal, so that DC bus-bar voltage levels off to the DC bus-bar voltage given value during fault traversing.
11. according to the method described in claim 10, it is characterized in that, the three-phase voltage signal according to power grid, judges electricity
Whether net voltage, which meets, preset is fallen condition, comprising:
Virtual value fortune is carried out to three phase voltages of the power grid and three line voltages using the three-phase voltage signal of the power grid
It calculates, obtains the virtual value of each voltage；
Judge respectively the virtual value of each voltage whether be lower than it is corresponding fall threshold voltage, when the virtual value of any one voltage is low
In it is corresponding fall threshold voltage when, determine that wind power generating set is in fault traversing operating condition.
12. according to the method for claim 11, which is characterized in that the method also includes:
Judge whether the virtual value of all phase voltages and line voltage entirely reaches corresponding recovery threshold voltage, when all phase voltages
When entirely reaching corresponding recovery threshold voltage with the virtual value of line voltage, the second feedback regulation module and described the are disconnected
Connection between one feedback regulation module.
13. according to the method for claim 12, which is characterized in that the method also includes:
In the predetermined amount of time after all phase voltages and line voltage entirely reach corresponding recovery threshold voltage, make limiter of speed
Series connection accesses the route between the generator and the first feedback regulation module；And it is described after a predetermined period of time, will
The limiter of speed is cut off on the route between the generator and the first feedback regulation module.
14. according to the method described in claim 10, it is characterized in that, the initial boost given value of current value is wind-power electricity generation
Ratio between the output power and pusher side rectified voltage of unit；The method also includes:
Judge whether the pusher side rectified voltage reaches the starting voltage of the brake unit of current transformer, when the pusher side rectified voltage
When reaching the starting voltage of the brake unit, output makes the control signal of the brake unit starting.
15. according to the method described in claim 10, it is characterized in that, the method also includes:
By third feedback regulation module according between the DC bus-bar voltage measured value and the DC bus-bar voltage given value
Error signal, export the watt current given value of the power grid；
By the 4th feedback regulation module according to the watt current given value of the power grid, external electrical network reactive current given value, lock
The phase value of phase ring output and the three-phase current measured value of the power grid, the pwm signal of the IGBT in output driving current transformer；
According to the three-phase voltage signal of the power grid, the positive-sequence component of network voltage is obtained, and just based on the network voltage
Order components calculate the reactive current given value that the current transformer during fault traversing needs to issue, and work as the network voltage
Meet it is preset when falling condition, pause external electrical network reactive current given value it is given, and the current transformer is needed to issue
Reactive current given value as new reactive current given value；
Watt current given value, the current transformer by the 4th feedback regulation module also according to the power grid need to issue
The three-phase current measured value of reactive current given value, the phase value of phaselocked loop output and the power grid, exports updated
Pwm signal, so that the reactive power of the current transformer output meets the reactive requirement of the power grid during fault traversing.
16. according to the method for claim 15, which is characterized in that the method also includes:
Judge whether the virtual value of all phase voltages and line voltage entirely reaches corresponding recovery threshold voltage, and when all phase electricity
When the virtual value of pressure and line voltage entirely reaches corresponding recovery threshold voltage, stop the idle electricity that the current transformer needs to issue
The given of given value is flowed, the given of external electrical network reactive current given value is restored.
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| CN112134302B (en) * | 2020-08-31 | 2023-04-07 | 中国东方电气集团有限公司 | Fan high voltage ride through control system based on direct current bus voltage regulation |
| CN114221368A (en) * | 2021-11-15 | 2022-03-22 | 珠海格力智能装备有限公司 | Energy recovery control system and method applying direct current bus |
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