CN108667033A - Wind electric converter high voltage crossing control method and device based on Hysteresis control - Google Patents
Wind electric converter high voltage crossing control method and device based on Hysteresis control Download PDFInfo
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- CN108667033A CN108667033A CN201810357550.7A CN201810357550A CN108667033A CN 108667033 A CN108667033 A CN 108667033A CN 201810357550 A CN201810357550 A CN 201810357550A CN 108667033 A CN108667033 A CN 108667033A
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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- 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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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Abstract
The present invention relates to wind power generation current-transformation control technology fields, and particularly a kind of the high voltage crossing control method and device of the total power wind-force generating converter based on hysteretic loop current control, are as follows：The three-phase voltage for measuring power grid in real time carries out positive-negative sequence separation to network voltage, calculates power grid positive sequence voltage perunit value；Compare positive sequence voltage perunit value and electrical network high voltage threshold value, if it is less than high voltage threshold, full power convertor and network reactive power from unit main control unit, and more new record gives watt current value at this time；The present invention by monitoring network voltage and judging whether to be higher than electrical network high voltage threshold value in real time, when network voltage is higher than electrical network high voltage threshold value, it is calculated according to network voltage and gives reactive current given value, risen by absorbing a certain amount of idle inhibition network voltage from power grid, it is advantageous to realize that off-grid is not run full power convertor when network voltage increases, successfully realize that high voltage fail is passed through.
Description
Technical field
The present invention relates to wind power generation current-transformation control technology field, a kind of particularly full work(based on hysteretic loop current control
The high voltage crossing control method and device of rate wind-force generating converter.
Background technology
Wind energy is a kind of clean renewable resource, and wind generating technology develops rapidly in recent years, installed capacity of wind-driven power
Perhaps rapid soaring.Due to large-scale wind power integration, ratio of the wind energy in power grid constantly increases, it is desirable to which wind power generating set has
Standby stronger fault ride-through capacity.Wherein high voltage crossing ability is increasingly taken seriously, and external many countries have gone out
Platform relevant criterion and directive/guide.Domestic corresponding high-voltage ride through of wind power generating set regulation is also in formulation.
When power grid failure causes Wind turbines grid entry point overvoltage occur, if not using special control plan
Slightly, Wind turbines will be reduced by the active power of net side current transformer feed-in power grid, since wind-driven generator inertia is larger, be led to
The generator-side converter wear injection DC bus active power crossed in wind power unit converter is constant, will finally lead to DC bus-bar voltage
Lifting.When overvoltage is not serious, unit is possible to direct through fault, but when overvoltage is serious, unit is very likely
Off-grid due to current transformer DC bus-bar voltage is over-pressed or grid-connected current overcurrent.In extreme circumstances, full power convertor is also possible to
It damages.Therefore full power convertor needs, for the special traversing method of electrical network high voltage accident design, to promote unit
High voltage fail ride-through capability.
Existing related application such as number of patent application is that CN201210581893.4 and CN201620175536.1 is invented
Patent.Wherein application No. is proposing a kind of control method of DC side-discharging circuit in the invention of CN201210581893.4,
The invention only proposes the control method of direct-current unloading circuit, does not consider pusher side in wind power system, net side current transformer
Control and discharging circuit and pusher side, net side current transformer between Collaborative Control.Application No. is CN201620175536.1's
Utility model proposes a kind of low voltage crossing controller for direct current transportation application scenario, due to wind-powered electricity generation application scenario and directly
Stream transmission of electricity occasion low-voltage control in there are larger difference, direct current transportation control targe be avoid when low-voltage is restored by
The overvoltage caused by idle injection, and require current transformer in low voltage crossing whole process that overvoltage cannot occur in wind power system
Or over current fault, and unit is unable to off-grid.The Hysteresis control technology that stagnant ring is all made of in two above patent, but be all
Hysteresis control based on voltage, application No. is in the invention of CN201210581893.4 using the stagnant ring control of DC bus-bar voltage
The object of technology processed, Hysteresis control is direct-current unloading circuit, and there is no the controls for pusher side, net side current transformer to illustrate.Application
Number for CN201620175536.1 utility model using the Hysteresis control based on network voltage, network voltage is used only to
It carries out stagnant ring cutting between different control models to change, there is no directly inputted using voltage as what power switch controlled.
Invention content
In order to solve the problems, such as that conventional Wind turbines cannot pass through high voltage fail, the present invention proposes a kind of based on stagnant ring
The high voltage crossing control method and device of the total power wind-force generating converter of current control.
To realize that said effect, the technical solution of the application are as follows：
Wind electric converter high voltage crossing control method based on Hysteresis control, it is characterised in that：
It is as follows：
The three-phase voltage for measuring power grid in real time carries out positive-negative sequence separation to network voltage, calculates power grid positive sequence voltage mark
One value；
Compare positive sequence voltage perunit value and electrical network high voltage threshold value, electrical network high voltage threshold value is according to concerned countries standard and is
Design objective of uniting determines, if being less than high voltage threshold, full power convertor and network reactive power from unit main control unit, and more
New record gives watt current value at this time；If positive sequence voltage perunit value is higher than high voltage threshold, according to power grid positive sequence voltage
Given reactive current value is calculated, maximum given watt current calculated value is calculated further according to given reactive current value；
It the given watt current value of more new record and is currently calculated when being less than high voltage threshold according to power grid positive sequence voltage
The given watt current calculated value arrived takes small conduct therein currently to give watt current given value；
Grid-connected three-phase current given value is calculated according to given watt current value and given reactive current value；
Hysteretic loop current control unit is according to grid-connected three-phase current given value, Hysteresis control bandwidth and the grid-connected three-phase electricity of detection
Stream calculation obtains the power switch control signal of control net side current transformer, and it is dynamic that corresponding power switch is controlled after drive amplification
Make；
Detection current transformer DC bus-bar voltage u in real timedc, as DC bus-bar voltage udcMore than the first mistake of DC bus-bar voltage
Press threshold value udc_T1When control DC bus chopper circuit power switch it is open-minded, DC bus-bar voltage is more than the first overvoltage threshold
udc_T1More, power switch conducting dutycycle D is bigger, and chopping switch conducting dutycycle is with DC bus-bar voltage with the first over-pressed threshold
Value difference value is linear, when DC bus-bar voltage meets or exceeds the second overvoltage threshold of DC bus-bar voltage udc_T2When, power
Switch is all open-minded；
After power switch is opened, DC bus will be released energy by letting out energy resistance.
Further, positive sequence voltage perunit value calculates as follows：
In formula, u* gIndicate power grid positive sequence voltage perunit value, ugPIndicate that isolated power grid positive sequence voltage has
Valid value, ugrIndicate specified network voltage value.ugrIt is system fixed value, ugPIt is calculated by carrying out positive-negative sequence separation to network voltage
It obtains.
Further, the calculation formula for giving reactive current value and maximum given watt current calculated value distinguishes following institute
Show：
i* Q=2IN(u* g-u* gT)
In formula, i* QIt indicates to give reactive current value, u* gIndicate power grid positive sequence voltage perunit value, u* gTIndicate electricity
The high voltage threshold of net voltage；u* gTIt is determined according to concerned countries standard and system design objective.
In formula, iPmaxIndicate maximum given watt current calculated value, INIndicate the grid-connected rated current of current transformer, i* QTable
Show given reactive current value, k1Indicate full power convertor overload capacity coefficient.INAnd k1It is determined according to current transformer design objective,
Usual k1>1.
Further, the calculation formula for giving watt current value is as follows：
i* P=min (i* P_ref,iPmax)
I in formula* PIt indicates to give watt current value, i* P_refMore new record when power grid positive sequence voltage is less than high voltage threshold
Given watt current value, iPmaxIndicate maximum given watt current calculated value.i* P_refIt is calculated by outer voltage；
Further, grid-connected three-phase current gives the following formula of value calculating method：
In above formula, ia_ref、ia_ref、ia_refRespectively grid-connected A, B, C phase current given value, i* PIt indicates to give watt current
Value, i* QIt indicates to give reactive current value, θ is the electric network voltage phase that network voltage phaselocked loop is calculated.θ is calculated by phaselocked loop
It obtains.
Further, duty ratio and the relationship of overvoltage threshold are expressed as：
K in formulacFor power switch Duty ratio control coefficient.：udcIt is the DC bus-bar voltage that sample detecting obtains, udc_T1And udc_T2According to power device pressure resistance and
Voltage margin determines.
A kind of wind electric converter high voltage crossing device based on hysteretic loop current control, it is characterised in that：Including：Signal is examined
Survey unit, system control unit, Hysteresis control unit and chop control unit, system control unit and chop control unit, letter
Number detection unit is connected with hysteretic loop current control unit by hardwire, for transmitting the control signal believed.Signal detection list
Member is connect with chop control unit, hysteretic loop current control unit, system control unit by hardwire, the signal for that will acquire
It is transferred to each control unit.Chop control unit is connect with DC bus chopper circuit by hardwire.
The detecting signal unit for detecting power grid three-phase voltage, grid-connected three-phase current and DC bus-bar voltage in real time.
The power grid three-phase voltage that system control unit is obtained according to detection, isolates positive sequence voltage, determines that positive sequence voltage is
It is no to be more than electrical network high voltage threshold value, and be responsible for calculating the grid-connected three-phase current given value of power grid.
Hysteresis control unit is according to the calculated grid-connected three-phase current given value of system control unit and detecting signal unit
The grid-connected three-phase current of detection generates the PWM control letters of net side current transformer power switch in conjunction with preset stagnant loop bandwidth
Number.
Chop control unit judges whether to need enabled direct current female according to the DC bus-bar voltage that detecting signal unit detects
Line chopper circuit, and be responsible for generating the control signal of control copped wave electric wave circuit power switch.
Advantages of the present invention is：
The present invention by monitoring network voltage and judging whether to be higher than electrical network high voltage threshold value in real time, when network voltage is higher than
It when electrical network high voltage threshold value, is calculated according to network voltage and gives reactive current given value, by absorbing a certain amount of nothing from power grid
Work(inhibits network voltage to rise, advantageous to realize that off-grid is not run full power convertor when network voltage increases, and successfully realizes high
Voltage failure passes through；
When network voltage is higher than electrical network high voltage threshold value, in the preferential premise for meeting and giving reactive current and giving output
Under, the overload capacity of current transformer is made full use of, the maximum that current transformer can export is calculated and gives watt current calculated value, work as electricity
The given watt current value of more new record is more than maximum given watt current calculated value when net positive sequence voltage is less than high voltage threshold
When, current transformer gives watt current and is given by the given watt current calculated value of maximum, is advantageously implemented in this way to power grid and is presented
Enter most active power, is conducive to inhibit DC bus-bar voltage overvoltage；
D-c bus voltage value is monitored in the present invention in real time, control is straight when DC bus-bar voltage is more than DC bus threshold value
The action of busbar chopper circuit is flowed, released energy current transformer off-grid fortune caused by DC bus-bar voltage can be inhibited to rise sharply by resistance
Row can further damage to avoid because of DC bus-bar voltage more than current transformer caused by operational envelope.
The present invention monitors power grid three-phase voltage and carries out positive-negative sequence separation to network voltage in real time, passes through positive sequence voltage component
To judge whether network voltage high voltage occurs, it is possible to authenticate height electricity of the network voltage symmetrically and under asymmetric two kinds of different situations
Failure is pressed, and then controls current transformer and passes through high voltage fail.
Generator-side converter wear of the present invention uses hysteretic loop current control, hysteretic loop current control unit grid-connected according to calculating when controlling
The hysteresis current bandwidth of three-phase current given value and setting directly generates net side by the three-phase grid electric current with sampling back
Other control parameters need not be arranged in current transformer power switch pwm signal, and control is simple, and dynamic response is fast.
Description of the drawings
Fig. 1 is the total power wind power generating set system control principle drawing of the embodiment of the present invention
Fig. 2 is the system composed structure schematic diagram of the embodiment of the present invention
Fig. 3 is that the total power wind-force generating converter electrical network high voltage of the embodiment of the present invention passes through control principle schematic diagram
Fig. 4 is that the total power wind-force generating converter of the embodiment of the present invention passes through the state of operation in network voltage overvoltage
Figure
Specific implementation mode
Embodiment 1
Wind electric converter high voltage crossing control method based on Hysteresis control, it is characterised in that：
It is as follows：
The three-phase voltage for measuring power grid in real time carries out positive-negative sequence separation to network voltage, calculates power grid positive sequence voltage mark
One value；
Compare positive sequence voltage perunit value and electrical network high voltage threshold value, electrical network high voltage threshold value is according to concerned countries standard and is
Design objective of uniting determines, if being less than high voltage threshold, full power convertor and network reactive power from unit main control unit, and more
New record gives watt current value at this time；If positive sequence voltage perunit value is higher than high voltage threshold, according to power grid positive sequence voltage
Given reactive current value is calculated, maximum given watt current calculated value is calculated further according to given reactive current value；
It the given watt current value of more new record and is currently calculated when being less than high voltage threshold according to power grid positive sequence voltage
The given watt current calculated value arrived takes small conduct therein currently to give watt current given value；
Grid-connected three-phase current given value is calculated according to given watt current value and given reactive current value；
Hysteretic loop current control unit is according to grid-connected three-phase current given value, Hysteresis control bandwidth and the grid-connected three-phase electricity of detection
Stream calculation obtains the power switch control signal of control net side current transformer, and it is dynamic that corresponding power switch is controlled after drive amplification
Make；
Detection current transformer DC bus-bar voltage u in real timedc, as DC bus-bar voltage udcMore than the first mistake of DC bus-bar voltage
Press threshold value udc_T1When control DC bus chopper circuit power switch it is open-minded, DC bus-bar voltage is more than the first overvoltage threshold
udc_T1More, power switch conducting dutycycle D is bigger, and chopping switch conducting dutycycle is with DC bus-bar voltage with the first over-pressed threshold
Value difference value is linear, when DC bus-bar voltage meets or exceeds the second overvoltage threshold of DC bus-bar voltage udc_T2When, power
Switch is all open-minded；
After power switch is opened, DC bus will be released energy by letting out energy resistance.
Embodiment 2
Wind electric converter high voltage crossing control method based on Hysteresis control, it is characterised in that：
It is as follows：
The three-phase voltage for measuring power grid in real time carries out positive-negative sequence separation to network voltage, calculates power grid positive sequence voltage mark
One value；
Compare positive sequence voltage perunit value and electrical network high voltage threshold value, electrical network high voltage threshold value is according to concerned countries standard and is
Design objective of uniting determines, if being less than high voltage threshold, full power convertor and network reactive power from unit main control unit, and more
New record gives watt current value at this time；If positive sequence voltage perunit value is higher than high voltage threshold, according to power grid positive sequence voltage
Given reactive current value is calculated, maximum given watt current calculated value is calculated further according to given reactive current value；
It the given watt current value of more new record and is currently calculated when being less than high voltage threshold according to power grid positive sequence voltage
The given watt current calculated value arrived takes small conduct therein currently to give watt current given value；
Grid-connected three-phase current given value is calculated according to given watt current value and given reactive current value；
Hysteretic loop current control unit is according to grid-connected three-phase current given value, Hysteresis control bandwidth and the grid-connected three-phase electricity of detection
Stream calculation obtains the power switch control signal of control net side current transformer, and it is dynamic that corresponding power switch is controlled after drive amplification
Make；
Detection current transformer DC bus-bar voltage u in real timedc, as DC bus-bar voltage udcMore than the first mistake of DC bus-bar voltage
Press threshold value udc_T1When control DC bus chopper circuit power switch it is open-minded, DC bus-bar voltage is more than the first overvoltage threshold
udc_T1More, power switch conducting dutycycle D is bigger, and chopping switch conducting dutycycle is with DC bus-bar voltage with the first over-pressed threshold
Value difference value is linear, when DC bus-bar voltage meets or exceeds the second overvoltage threshold of DC bus-bar voltage udc_T2When, power
Switch is all open-minded；
After power switch is opened, DC bus will be released energy by letting out energy resistance.
Further, positive sequence voltage perunit value calculates as follows：
In formula, u* gIndicate power grid positive sequence voltage perunit value, ugPIndicate that isolated power grid positive sequence voltage has
Valid value, ugrIndicate specified network voltage value.ugrIt is system fixed value, ugPIt is calculated by carrying out positive-negative sequence separation to network voltage
It obtains.
Further, the calculation formula for giving reactive current value and maximum given watt current calculated value distinguishes following institute
Show：
i* Q=2IN(u* g-u* gT)
In formula, i* QIt indicates to give reactive current value, u* gIndicate power grid positive sequence voltage perunit value, u* gTIndicate electricity
The high voltage threshold of net voltage；u* gTIt is determined according to concerned countries standard and system design objective.
In formula, iPmaxIndicate maximum given watt current calculated value, INIndicate the grid-connected rated current of current transformer, i* QTable
Show given reactive current value, k1Indicate full power convertor overload capacity coefficient.INAnd k1It is determined according to current transformer design objective,
Usual k1>1.
Further, the calculation formula for giving watt current value is as follows：
i* P=min (i* P_ref,iPmax)
I in formula* PIt indicates to give watt current value, i* P_refMore new record when power grid positive sequence voltage is less than high voltage threshold
Given watt current value, iPmaxIndicate maximum given watt current calculated value.i* P_refIt is calculated by outer voltage；
Further, grid-connected three-phase current gives the following formula of value calculating method：
In above formula, ia_ref、ia_ref、ia_refRespectively grid-connected A, B, C phase current given value, i* PIt indicates to give watt current
Value, i* QIt indicates to give reactive current value, θ is the electric network voltage phase that network voltage phaselocked loop is calculated.θ is calculated by phaselocked loop
It obtains.
Further, duty ratio and the relationship of overvoltage threshold are expressed as：
K in formulacFor power switch Duty ratio control coefficient.：udcIt is the DC bus-bar voltage that sample detecting obtains, udc_T1And udc_T2According to power device pressure resistance and
Voltage margin determines.
Embodiment 3
A kind of wind electric converter high voltage crossing device based on hysteretic loop current control, it is characterised in that：Including：Signal is examined
Survey unit, system control unit, Hysteresis control unit and chop control unit, system control unit and chop control unit, letter
Number detection unit is connected with hysteretic loop current control unit by hardwire, for transmitting the control signal believed.Signal detection list
Member is connect with chop control unit, hysteretic loop current control unit, system control unit by hardwire, the signal for that will acquire
It is transferred to each control unit.Chop control unit is connect with DC bus chopper circuit by hardwire,.
Embodiment 4
A kind of wind electric converter high voltage crossing device based on hysteretic loop current control includes：Detecting signal unit, system
Control unit, Hysteresis control unit and chop control unit, system control unit and chop control unit, detecting signal unit and
Hysteretic loop current control unit is connected by hardwire, for transmitting the control signal believed.Detecting signal unit and chop control
Unit, hysteretic loop current control unit, system control unit are connected by hardwire, and the signal transmission for that will acquire gives each control
Unit processed.Chop control unit is connect with DC bus chopper circuit by hardwire.
The detecting signal unit for detecting power grid three-phase voltage, grid-connected three-phase current and DC bus-bar voltage in real time.
The power grid three-phase voltage that system control unit is obtained according to detection, isolates positive sequence voltage, determines that positive sequence voltage is
It is no to be more than electrical network high voltage threshold value, and be responsible for calculating the grid-connected three-phase current given value of power grid.
Hysteresis control unit is according to the calculated grid-connected three-phase current given value of system control unit and detecting signal unit
The grid-connected three-phase current of detection generates the PWM control letters of net side current transformer power switch in conjunction with preset stagnant loop bandwidth
Number.
Chop control unit judges whether to need enabled direct current female according to the DC bus-bar voltage that detecting signal unit detects
Line chopper circuit, and be responsible for generating the control signal of control copped wave electric wave circuit power switch.
Embodiment 5
Wind electric converter high voltage crossing control method based on Hysteresis control, is as follows：
The three-phase voltage for measuring power grid in real time carries out positive-negative sequence separation to network voltage, calculates power grid positive sequence voltage mark
One value；
Compare positive sequence voltage perunit value and electrical network high voltage threshold value, electrical network high voltage threshold value is according to concerned countries standard and is
Design objective of uniting determines, if being less than high voltage threshold, full power convertor and network reactive power from unit main control unit, and more
New record gives watt current value at this time；If positive sequence voltage perunit value is higher than high voltage threshold, according to power grid positive sequence voltage
Given reactive current value is calculated, maximum given watt current calculated value is calculated further according to given reactive current value；
It the given watt current value of more new record and is currently calculated when being less than high voltage threshold according to power grid positive sequence voltage
The given watt current calculated value arrived takes small conduct therein currently to give watt current given value；
Grid-connected three-phase current given value is calculated according to given watt current value and given reactive current value；
Hysteretic loop current control unit is according to grid-connected three-phase current given value, Hysteresis control bandwidth and the grid-connected three-phase electricity of detection
Stream calculation obtains the power switch control signal of control net side current transformer, and it is dynamic that corresponding power switch is controlled after drive amplification
Make；
Detection current transformer DC bus-bar voltage u in real timedc, as DC bus-bar voltage udcMore than the first mistake of DC bus-bar voltage
Press threshold value udc_T1When control DC bus chopper circuit power switch it is open-minded, DC bus-bar voltage is more than the first overvoltage threshold
udc_T1More, power switch conducting dutycycle D is bigger, and chopping switch conducting dutycycle is with DC bus-bar voltage with the first over-pressed threshold
Value difference value is linear, when DC bus-bar voltage meets or exceeds the second overvoltage threshold of DC bus-bar voltage udc_T2When, power
Switch is all open-minded；
After power switch is opened, DC bus will be released energy by letting out energy resistance.
Further, positive sequence voltage perunit value calculates as follows：
In formula, u* gIndicate power grid positive sequence voltage perunit value, ugPIndicate that isolated power grid positive sequence voltage has
Valid value, ugrIndicate specified network voltage value.ugrIt is system fixed value, ugPIt is calculated by carrying out positive-negative sequence separation to network voltage
It obtains.
Further, the calculation formula for giving reactive current value and maximum given watt current calculated value distinguishes following institute
Show：
i* Q=2IN(u* g-u* gT)
In formula, i* QIt indicates to give reactive current value, u* gIndicate power grid positive sequence voltage perunit value, u* gTIndicate electricity
The high voltage threshold of net voltage；u* gTIt is determined according to concerned countries standard and system design objective.
In formula, iPmaxIndicate maximum given watt current calculated value, INIndicate the grid-connected rated current of current transformer, i* QTable
Show given reactive current value, k1Indicate full power convertor overload capacity coefficient.INAnd k1It is determined according to current transformer design objective,
Usual k1>1.
Further, the calculation formula for giving watt current value is as follows：
i* P=min (i* P_ref,iPmax)
I in formula* PIt indicates to give watt current value, i* P_refMore new record when power grid positive sequence voltage is less than high voltage threshold
Given watt current value, iPmaxIndicate maximum given watt current calculated value.i* P_refIt is calculated by outer voltage；
Further, grid-connected three-phase current gives the following formula of value calculating method：
In above formula, ia_ref、ia_ref、ia_refRespectively grid-connected A, B, C phase current given value, i* PIt indicates to give watt current
Value, i* QIt indicates to give reactive current value, θ is the electric network voltage phase that network voltage phaselocked loop is calculated.θ is calculated by phaselocked loop
It obtains.
Further, duty ratio and the relationship of overvoltage threshold are expressed as：
K in formulacFor power switch Duty ratio control coefficient.：udcIt is the DC bus-bar voltage that sample detecting obtains, udc_T1And udc_T2According to power device pressure resistance and
Voltage margin determines.
A kind of wind electric converter high voltage crossing device based on hysteretic loop current control, it is characterised in that：Including：Signal is examined
Survey unit, system control unit, Hysteresis control unit and chop control unit, system control unit and chop control unit, letter
Number detection unit is connected with hysteretic loop current control unit by hardwire, for transmitting the control signal believed.Signal detection list
Member is connect with chop control unit, hysteretic loop current control unit, system control unit by hardwire, the signal for that will acquire
It is transferred to each control unit.Chop control unit is connect with DC bus chopper circuit by hardwire.
The detecting signal unit for detecting power grid three-phase voltage, grid-connected three-phase current and DC bus-bar voltage in real time.
The power grid three-phase voltage that system control unit is obtained according to detection, isolates positive sequence voltage, determines that positive sequence voltage is
It is no to be more than electrical network high voltage threshold value, and be responsible for calculating the grid-connected three-phase current given value of power grid.
Hysteresis control unit is according to the calculated grid-connected three-phase current given value of system control unit and detecting signal unit
The grid-connected three-phase current of detection generates the PWM control letters of net side current transformer power switch in conjunction with preset stagnant loop bandwidth
Number.
Chop control unit judges whether to need enabled direct current female according to the DC bus-bar voltage that detecting signal unit detects
Line chopper circuit, and be responsible for generating the control signal of control copped wave electric wave circuit power switch.
The present invention by monitoring network voltage and judging whether to be higher than electrical network high voltage threshold value in real time, when network voltage is higher than
It when electrical network high voltage threshold value, is calculated according to network voltage and gives reactive current given value, by absorbing a certain amount of nothing from power grid
Work(inhibits network voltage to rise, advantageous to realize that off-grid is not run full power convertor when network voltage increases, and successfully realizes high
Voltage failure passes through；
When network voltage is higher than electrical network high voltage threshold value, in the preferential premise for meeting and giving reactive current and giving output
Under, the overload capacity of current transformer is made full use of, the maximum that current transformer can export is calculated and gives watt current calculated value, work as electricity
The given watt current value of more new record is more than maximum given watt current calculated value when net positive sequence voltage is less than high voltage threshold
When, current transformer gives watt current and is given by the given watt current calculated value of maximum, is advantageously implemented in this way to power grid and is presented
Enter most active power, is conducive to inhibit DC bus-bar voltage overvoltage；
D-c bus voltage value is monitored in the present invention in real time, control is straight when DC bus-bar voltage is more than DC bus threshold value
The action of busbar chopper circuit is flowed, released energy current transformer off-grid fortune caused by DC bus-bar voltage can be inhibited to rise sharply by resistance
Row can further damage to avoid because of DC bus-bar voltage more than current transformer caused by operational envelope.
The present invention monitors power grid three-phase voltage and carries out positive-negative sequence separation to network voltage in real time, passes through positive sequence voltage component
To judge whether network voltage high voltage occurs, it is possible to authenticate height electricity of the network voltage symmetrically and under asymmetric two kinds of different situations
Failure is pressed, and then controls current transformer and passes through high voltage fail.
Generator-side converter wear of the present invention uses hysteretic loop current control, hysteretic loop current control unit grid-connected according to calculating when controlling
The hysteresis current bandwidth of three-phase current given value and setting directly generates net side by the three-phase grid electric current with sampling back
Other control parameters need not be arranged in current transformer power switch pwm signal, and control is simple, and dynamic response is fast.
A kind of high voltage crossing control method and device based on hysteretic loop current control are provided in the present embodiment.Such as Fig. 1
Shown is total power wind power generating set system control principle drawing.Wind turbine is by absorbing wind energy rotation forces wind turbine power generation
Generator is sent out the convert alternating current of voltage to frequency variation into DC voltage by operation, generator-side converter wear, and net side current transformer is responsible for
By DC power conversion at alternating current feed-in power grid.When overvoltage occurs for network voltage, corresponding control unit controls net side unsteady flow
Device and chopper circuit carry out high voltage crossing control to overvoltage failure.
Fig. 2 is the high voltage crossing control device composed structure schematic diagram of total power wind-force generating converter in embodiment,
Total power wind-force generating converter ontology is by generator-side converter wear, DC bus copped wave unit, DC bus and net side current transformer structure
At.Current transformer high voltage crossing control device includes detecting signal unit, system control unit, chop control unit and stagnant ring electricity
Flow control unit.Detecting signal unit detects network voltage, DC bus-bar voltage and net side current transformer grid-connected current, system control
Unit carries out positive-negative sequence separation according to the obtained network voltage of detection, calculate power grid positive sequence voltage perunit value and with the high electricity of power grid
Pressure threshold value is compared, and when power grid positive sequence voltage perunit value is higher than electrical network high voltage threshold value, on the one hand enables chop control list
Member, the DC bus-bar voltage driving DC bus chopper circuit action that copped wave unit is obtained further according to detection；On the other hand, system
Control unit is calculated that net side current transformer is active and reactive command according to power grid positive sequence voltage perunit value, and according to control unit
The grid phase that internal phaselocked loop is calculated calculates the current-order of net side hysteretic loop current control unit, hysteretic loop current control list
Member generates the pwm control signal of control net side current transformer according to the grid-connected current that current-order and detection obtain.
Be shown in Fig. 3 the embodiment of the present invention total power wind-force generating converter electrical network high voltage pass through control principle signal
Figure, when power grid positive sequence voltage perunit value is less than electrical network high voltage threshold value, height wears enabled switch and pushes position 1, and watt current is given
Definite value ip *It is calculated by DC bus-bar voltage outer shroud, i.e. iP *=iP_ref；Reactive current given value is given from master control, i.e. iq *
=iq_ref。
When power grid positive sequence voltage perunit value is higher than electrical network high voltage threshold value, height wears enabled switch and pushes position 2, according to electricity
Net positive sequence voltage perunit value ug *, electrical network high voltage threshold value ugT *With current transformer rated current INCalculate given reactive current value i* Q
=2IN(u* g-u* gT), further according to the overload capacity coefficient k of current transformer1, it is calculated maximum active to constant currentThe given watt current value of more new record when it and power grid positive sequence voltage are less than high voltage threshold
iP_refIt is compared, selects small as watt current given value, i.e. iP *=min (iP_ref,iPmax).Instruction current generates single
Member instructs i according to watt currentP *, referenced reactive current iQ *And the grid phase θ that phaselocked loop is calculated, it is calculated stagnant
Three-phase current needed for ring control instructs ia_ref、ib_refAnd ic_ref.Final Hysteresis control unit is instructed and is examined according to three-phase current
The grid-connected three-phase current surveyed obtains the power switch control signal of net side current transformer.
When power grid positive sequence voltage perunit value is higher than electrical network high voltage threshold value, DC bus-bar voltage may be because that power grid is excessively electric
Pressure and it is over-pressed, at this moment DC bus chop control unit is over-pressed according to the DC bus-bar voltage and DC bus-bar voltage that detect in real time
Threshold value controls chopper circuit power switch, and direct current is controlled when DC bus-bar voltage is more than the first overvoltage threshold of DC bus-bar voltage
Busbar chopper circuit power switch is open-minded, and DC bus-bar voltage is more than that the first overvoltage threshold is more, power switch conducting dutycycle
Bigger, chopping switch conducting dutycycle is linear with the first overvoltage threshold difference with DC bus-bar voltage, works as DC bus
When voltage meets or exceeds the second overvoltage threshold of DC bus-bar voltage, power switch is all open-minded.After power switch is opened, direct current
Busbar will be released energy by letting out energy resistance.
Fig. 4 is that the total power wind-force generating converter of the embodiment of the present invention passes through the state of operation in network voltage overvoltage
Scheme, corresponding waveform is followed successively by power grid A phase voltages (V), power grid A phase voltages perunit value (pu), DC bus from top to bottom in figure
Voltage (V), current transformer grid-connected current (A) and the capacitive reactive power (Var) for injecting power grid.As can be seen that working as power grid positive sequence voltage mark
When one value reaches 1.3pu, electrical network high voltage threshold value (being set as 1.1pu in embodiment) is reached, at this moment net side current transformer height is worn
Enabled switch pushes position 2, high voltage crossing control method of the invention effect, the capacitive that control current transformer is born to power grid injection
It is idle, while talkaround, current transformer DC bus-bar voltage are not less than 1300V, are limited in safe range current transformer.Power grid
After voltage restores normal, current transformer height wears enabled switch and pushes position 1 from newly, and logic when current transformer is by normal power grid is controlled
System.Unit overvoltage passes through operating status figure and illustrates the high voltage crossing controlling party proposed by the present invention based on hysteretic loop current control
Method can control total power wind-force generating converter and successfully pass through high voltage fail, ensure the safe and stable operation of current transformer.
Claims (8)
1. the wind electric converter high voltage crossing control method based on Hysteresis control, it is characterised in that：
It is as follows：
The three-phase voltage for measuring power grid in real time carries out positive-negative sequence separation to network voltage, calculates power grid positive sequence voltage perunit value；
Compare positive sequence voltage perunit value and electrical network high voltage threshold value, if being less than high voltage threshold, full power convertor is grid-connected idle
Power comes from unit main control unit, and more new record gives watt current value at this time；If positive sequence voltage perunit value is higher than high electricity
Threshold value is pressed, then calculates given reactive current value according to power grid positive sequence voltage, calculating maximum further according to given reactive current value gives
Determine watt current calculated value；
It the given watt current value of more new record and is currently calculated when being less than high voltage threshold according to power grid positive sequence voltage
Given watt current calculated value, takes small conduct therein currently to give watt current given value；
Grid-connected three-phase current given value is calculated according to given watt current value and given reactive current value；
Hysteretic loop current control unit is according to the grid-connected three-phase electricity flowmeter of grid-connected three-phase current given value, Hysteresis control bandwidth and detection
It calculates and obtains the power switch control signal of control net side current transformer, corresponding power switch action is controlled after drive amplification；
Detection current transformer DC bus-bar voltage u in real timedc, as DC bus-bar voltage udcMore than the first overvoltage threshold of DC bus-bar voltage
udc_T1When control DC bus chopper circuit power switch it is open-minded, DC bus-bar voltage is more than the first overvoltage threshold udc_T1It is more,
Power switch conducting dutycycle D is bigger, chopping switch conducting dutycycle and DC bus-bar voltage with the first overvoltage threshold difference at
Linear relationship, when DC bus-bar voltage meets or exceeds the second overvoltage threshold of DC bus-bar voltage udc_T2When, power switch is whole
It is open-minded；
After power switch is opened, DC bus will be released energy by letting out energy resistance.
2. the wind electric converter high voltage crossing control method according to claim 1 based on Hysteresis control, feature exist
In：Positive sequence voltage perunit value calculates as follows：
In formula, u* gIndicate power grid positive sequence voltage perunit value, ugPIndicate that isolated power grid positive sequence voltage is effective
Value, ugrIndicate specified network voltage value.
3. the wind electric converter high voltage crossing control method according to claim 1 based on Hysteresis control, feature exist
In：Given reactive current value and the calculation formula difference of maximum given watt current calculated value are as follows：
i* Q=2IN(u* g-u* gT)
In formula, i* QIt indicates to give reactive current value, u* gIndicate power grid positive sequence voltage perunit value, u* gTIndicate the height electricity of network voltage
Press threshold value；
In formula, iPmaxIndicate maximum given watt current calculated value, INIndicate the grid-connected rated current of current transformer, i* QIt is represented to
Determine reactive current value, k1Indicate full power convertor overload capacity coefficient.
4. the wind electric converter high voltage crossing control method according to claim 1 based on Hysteresis control, feature exist
In：The calculation formula of given watt current value is as follows：
i* P=min (i* P_ref,iPmax)
I in formula* PIt indicates to give watt current value, i* P_refMore new record is given when power grid positive sequence voltage is less than high voltage threshold
Watt current value, iPmaxIndicate maximum given watt current calculated value.
5. the wind electric converter high voltage crossing control method according to claim 1 based on Hysteresis control, feature exist
In：Grid-connected three-phase current gives the following formula of value calculating method：
In above formula, ia_ref、ia_ref、ia_refRespectively grid-connected A, B, C phase current given value, i* PIt indicates to give watt current value, i* Q
It indicates to give reactive current value, θ is the electric network voltage phase that network voltage phaselocked loop is calculated.
6. the wind electric converter high voltage crossing control method according to claim 1 based on Hysteresis control, feature exist
In：Duty ratio and the relationship of overvoltage threshold are expressed as：
K in formulacFor power switch Duty ratio control coefficient.：udcIt is the DC bus-bar voltage that sample detecting obtains, udc_T1And udc_T2According to power device pressure resistance and
Voltage margin determines.
7. a kind of wind electric converter high voltage crossing device based on hysteretic loop current control, it is characterised in that：Including：Signal detection
Unit, system control unit, Hysteresis control unit and chop control unit, system control unit and chop control unit, signal
Detection unit is connected with hysteretic loop current control unit by hardwire, detecting signal unit and chop control unit, hysteresis current
Control unit, system control unit are connected by hardwire, and chop control unit passes through hardwire with DC bus chopper circuit
Connection.
8. the wind electric converter high voltage crossing device according to claim 7 based on hysteretic loop current control, feature exist
In：The detecting signal unit for detecting power grid three-phase voltage, grid-connected three-phase current and DC bus-bar voltage in real time；
The power grid three-phase voltage that system control unit is obtained according to detection, isolates positive sequence voltage, determines whether positive sequence voltage is big
In electrical network high voltage threshold value, and it is responsible for calculating the grid-connected three-phase current given value of power grid；
Hysteresis control unit is detected according to the calculated grid-connected three-phase current given value of system control unit and detecting signal unit
Grid-connected three-phase current generate the pwm control signal of net side current transformer power switch in conjunction with preset stagnant loop bandwidth；
Chop control unit judges whether that enabled DC bus is needed to cut according to the DC bus-bar voltage that detecting signal unit detects
Wave circuit, and be responsible for generating the control signal of control copped wave electric wave circuit power switch.
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Application publication date: 20181016 |