CN108649601A - Wind electric converter low voltage traversing control method based on Hysteresis control and device - Google Patents
Wind electric converter low voltage traversing control method based on Hysteresis control and device Download PDFInfo
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- CN108649601A CN108649601A CN201810357563.4A CN201810357563A CN108649601A CN 108649601 A CN108649601 A CN 108649601A CN 201810357563 A CN201810357563 A CN 201810357563A CN 108649601 A CN108649601 A CN 108649601A
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- H02J3/386—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M5/4585—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only having a rectifier with controlled elements
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- 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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Abstract
The present invention relates to wind power generation current-transformation control technology fields, and particularly a kind of the low voltage traversing 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, respectively obtains the positive-sequence component and negative sequence component of network voltage；After obtaining network voltage positive-sequence component, the phase angle of network voltage is calculated by voltage phaselocked loopAnd frequency；Unbalanced source voltage degree and power grid positive sequence voltage perunit value is calculated；The present invention by monitoring network voltage and judging whether network voltage is less than electrical network low voltage threshold value in real time, when network voltage is less than electrical network low voltage threshold value, it is calculated according to network voltage and gives reactive current given value, by being provided a supporting role to power grid injecting reactive current to power grid, help power system restoration, it is advantageous to realize that off-grid is not run full power convertor when network voltage increases, successfully realize that low voltage failure passes 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 low voltage traversing 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 the low voltage ride-through capability of Wind turbines can avoid that low-voltage in short-term occurs in power grid
Large-scale wind power unit off-grid when failure, to reduce impact of the large-scale wind power unit to power grid.At present it is international and domestic
Relevant criterion is put into effect to clearly require the low voltage ride-through capability of Wind turbines.
Grid collapses often cause Wind turbines grid entry point Voltage Drop occur, when the grid-connected power of current transformer is smaller
Or grid voltage sags it is not serious when, current transformer generally can by itself adjust directly pass through low voltage failure.But work as
Power grid falls seriously, and the grid-connected power of current transformer is larger or even close to full load, and Wind turbines pass through net side current transformer feed-in
The active power of power grid will be reduced, and since wind-driven generator inertia is larger, pass through the pusher side unsteady flow in wind power unit converter
Device injection DC bus active power is constant, and unit is very likely because of current transformer DC bus-bar voltage overvoltage or grid-connected current overcurrent
And off-grid.In extreme circumstances, full power convertor is also possible that damage.Therefore full power convertor needs low for power grid
Voltage failure designs special control method and device, promotes the low voltage failure ride-through capability of Wind turbines.
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 low voltage failure, the present invention proposes a kind of based on stagnant ring
The low voltage traversing 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 low voltage traversing 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, is respectively obtaining network voltage just
Order components and negative sequence component；
After obtaining network voltage positive-sequence component, the phase angle θ and frequency of network voltage are calculated by voltage phaselocked loop
ω；
Unbalanced source voltage degree and power grid positive sequence voltage perunit value is calculated；
Compare positive sequence voltage perunit value and electrical network low voltage threshold value, electrical network low voltage threshold value is according to concerned countries standard and is
Design objective of uniting determines, if being higher than low 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 less than low 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 higher than low 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, it may be calculated as out unbalanced source voltage degree：
ε indicates unbalanced source voltage degree, u in formulagNIndicate negative sequence voltage virtual value, ugPIndicate positive sequence voltage
Virtual value.Wherein ugNAnd ugPIt is calculated by carrying out positive-negative sequence separation to network voltage.
Further, power grid positive sequence voltage perunit value is calculated 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.ugrFor 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=1.5kQ·IN(0.9-u* g)
In formula, i* QIt indicates to give reactive current value, u* gIndicate power grid positive sequence voltage perunit value, u* gTIndicate network voltage
Low voltage threshold.u* gTIt is obtained according to concerned countries standard and system design objective, kQIndicate reactive balance penalty coefficient, kQBy electricity
Net voltage unbalance factor ε is determined, as ε ＜ 5%, kQ=1；When ε is more than 5%, kQIt can be instructed and be determined according to master control, it can also
Take 0.
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, 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 low voltage threshold
Given watt current value, iPmaxIndicate maximum given watt current calculated value.i* P_refIt is calculated by outer voltage；
Further, the computational methods such as following formula of grid-connected three-phase current given value：
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.
Further, duty ratio and the relationship of overvoltage threshold are expressed as：
K in formulacFor power switch Duty ratio control coefficient,
WhereinudcIt is the DC bus-bar voltage that sample detecting obtains, udc_T1And udc_T2According to the resistance to of power device
Pressure and voltage margin determine.
A kind of wind electric converter low voltage ride through device based on hysteretic loop current control, it is characterised in that：Including：Direct current is female
Line chopper circuit, detecting signal unit, system control unit, Hysteresis control unit and chop control unit, system control unit
It is connect by hardwire with chop control unit, detecting signal unit and hysteretic loop current control unit, for transmitting the control believed
Signal processed；Detecting signal unit is connected with chop control unit, hysteretic loop current control unit, system control unit by hardwire
It connects, the signal transmission for that will acquire gives each control unit；Chop control unit is with DC bus chopper circuit by connecing firmly
Line connects, and chop control unit provides driving protection signal to DC bus chopper circuit.
The DC bus chopper circuit includes power semiconductor switch and bleeder resistance, by chopper circuit control unit control
System, releases energy for DC bus-bar voltage.
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 system control unit completes the overall control of entire current transformer, according to the obtained power grid three-phase voltage of detection,
Positive sequence voltage is isolated, judges whether that low voltage failure of electric network occurs, and be responsible for calculating the grid-connected three-phase current given value of power grid；
The Hysteresis control unit is according to the calculated grid-connected three-phase current given value of system control unit and signal detection
The grid-connected three-phase current of unit detection generates the PWM control letters of net side current transformer power switch in conjunction with the stagnant loop bandwidth of setting
Number；
The chop control unit judges whether to need enabled straight according to the DC bus-bar voltage that detecting signal unit detects
Busbar chopper circuit is flowed, and is responsible for generating the control signal of control copped wave electric wave circuit power switch.
Advantages of the present invention is：
The present invention works as power grid by monitoring network voltage in real time and judging whether network voltage is less than electrical network low voltage threshold value
It when voltage is less than electrical network low voltage threshold value, is calculated according to network voltage and gives reactive current given value, by injecting nothing to power grid
Work(Current on Grid provides a supporting role, and helps power system restoration, advantageous to realize full power convertor when network voltage increases not
Off-grid is run, and successfully realizes that low voltage failure passes through；
When network voltage is less than electrical network low 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 low 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, when DC bus-bar voltage is more than DC bus first threshold time control
DC bus chopper circuit processed starts to act, and when DC bus-bar voltage is more than DC bus second threshold, chopping switch is opened completely
Logical, released energy current transformer off-grid operation caused by DC bus-bar voltage can be inhibited to rise sharply by resistance, further can be with
The current transformer caused by DC bus-bar voltage is more than operational envelope is avoided to damage.
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 low-voltage occurs, it is possible to authenticate the low electricity under the symmetrical and asymmetric two kinds of different situations of network voltage
Press failure, so control current transformer to it is grid-connected it is idle accordingly adjusted, and pass through low voltage failure.
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 low voltage of the embodiment of the present invention passes through control principle schematic diagram.
When Fig. 4-7 correspondence power grid three-phase voltage balances are fallen, power grid three-phase voltage (V), grid-connected three-phase current (A), direct current
The state diagram of the capacitive reactive power (kvar) of busbar voltage (V) and injection power grid.
When Fig. 8-11 correspondence unbalanced source voltages fall, power grid three-phase voltage (V), grid-connected three-phase current (A), direct current are female
The state diagram of the capacitive reactive power (kvar) of line voltage (V) and injection power grid.
Specific implementation mode
Embodiment 1
Wind electric converter low voltage traversing 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, is respectively obtaining network voltage just
Order components and negative sequence component；
After obtaining network voltage positive-sequence component, the phase angle θ and frequency of network voltage are calculated by voltage phaselocked loop
ω；
Unbalanced source voltage degree and power grid positive sequence voltage perunit value is calculated；
Compare positive sequence voltage perunit value and electrical network low voltage threshold value, electrical network low voltage threshold value is according to concerned countries standard and is
Design objective of uniting determines, if being higher than low 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 less than low 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 higher than low 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 low voltage traversing 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, is respectively obtaining network voltage just
Order components and negative sequence component；
After obtaining network voltage positive-sequence component, the phase angle θ and frequency of network voltage are calculated by voltage phaselocked loop
ω；
Unbalanced source voltage degree and power grid positive sequence voltage perunit value is calculated；
Compare positive sequence voltage perunit value and electrical network low voltage threshold value, electrical network low voltage threshold value is according to concerned countries standard and is
Design objective of uniting determines, if being higher than low 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 less than low 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 higher than low 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, it may be calculated as out unbalanced source voltage degree：
ε indicates unbalanced source voltage degree, u in formulagNIndicate negative sequence voltage virtual value, ugPIndicate positive sequence voltage
Virtual value.Wherein ugNAnd ugPIt is calculated by carrying out positive-negative sequence separation to network voltage.
Further, power grid positive sequence voltage perunit value is calculated 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.ugrFor 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=1.5kQ·IN(0.9-u* g)
In formula, i* QIt indicates to give reactive current value, u* gIndicate power grid positive sequence voltage perunit value, u* gTIndicate network voltage
Low voltage threshold.u* gTIt is obtained according to concerned countries standard and system design objective, kQIndicate reactive balance penalty coefficient, kQBy electricity
Net voltage unbalance factor ε is determined, as ε ＜ 5%, kQ=1；When ε is more than 5%, kQIt can be instructed and be determined according to master control, it can also
Take 0.
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, 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 low voltage threshold
Given watt current value, iPmaxIndicate maximum given watt current calculated value.i* P_refIt is calculated by outer voltage；
Further, the computational methods such as following formula of grid-connected three-phase current given value：
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.
Further, duty ratio and the relationship of overvoltage threshold are expressed as：
K in formulacFor power switch Duty ratio control coefficient,
WhereinudcIt is the DC bus-bar voltage that sample detecting obtains, udc_T1And udc_T2According to the resistance to of power device
Pressure and voltage margin determine.
Embodiment 3
A kind of wind electric converter low voltage ride through device based on hysteretic loop current control includes：DC bus chopper circuit,
Detecting signal unit, system control unit, Hysteresis control unit and chop control unit, system control unit and chop control list
Member, detecting signal unit are connected with hysteretic loop current control unit by hardwire, for transmitting the control signal believed；Signal is examined
It surveys unit to connect by hardwire with chop control unit, hysteretic loop current control unit, system control unit, for what will be acquired
Signal transmission gives each control unit；Chop control unit is connect with DC bus chopper circuit by hardwire, chop control
Unit provides driving protection signal to DC bus chopper circuit.
The DC bus chopper circuit includes power semiconductor switch and bleeder resistance, by chopper circuit control unit control
System, releases energy for DC bus-bar voltage.
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 system control unit completes the overall control of entire current transformer, according to the obtained power grid three-phase voltage of detection,
Positive sequence voltage is isolated, judges whether that low voltage failure of electric network occurs, and be responsible for calculating the grid-connected three-phase current given value of power grid；
The Hysteresis control unit is according to the calculated grid-connected three-phase current given value of system control unit and signal detection
The grid-connected three-phase current of unit detection generates the PWM control letters of net side current transformer power switch in conjunction with the stagnant loop bandwidth of setting
Number；
The chop control unit judges whether to need enabled straight according to the DC bus-bar voltage that detecting signal unit detects
Busbar chopper circuit is flowed, and is responsible for generating the control signal of control copped wave electric wave circuit power switch.
Embodiment 4
Wind electric converter low voltage traversing 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, is respectively obtaining network voltage just
Order components and negative sequence component；
After obtaining network voltage positive-sequence component, the phase angle θ and frequency of network voltage are calculated by voltage phaselocked loop
ω；
Unbalanced source voltage degree and power grid positive sequence voltage perunit value is calculated；
Compare positive sequence voltage perunit value and electrical network low voltage threshold value, electrical network low voltage threshold value is according to concerned countries standard and is
Design objective of uniting determines, if being higher than low 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 less than low 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 higher than low 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, it may be calculated as out unbalanced source voltage degree：
ε indicates unbalanced source voltage degree, u in formulagNIndicate negative sequence voltage virtual value, ugPIndicate positive sequence voltage
Virtual value.Wherein ugNAnd ugPIt is calculated by carrying out positive-negative sequence separation to network voltage.
Further, power grid positive sequence voltage perunit value is calculated 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.ugrFor 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=1.5kQ·IN(0.9-u* g)
In formula, i* QIt indicates to give reactive current value, u* gIndicate power grid positive sequence voltage perunit value, u* gTIndicate network voltage
Low voltage threshold.u*gTIt is obtained according to concerned countries standard and system design objective, kQIndicate reactive balance penalty coefficient, kQBy electricity
Net voltage unbalance factor ε is determined, as ε ＜ 5%, kQ=1；When ε is more than 5%, kQIt can be instructed and be determined according to master control, it can also
Take 0.
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, 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 low voltage threshold
Given watt current value, iPmaxIndicate maximum given watt current calculated value.i* P_refIt is calculated by outer voltage；
Further, the computational methods such as following formula of grid-connected three-phase current given value：
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.
Further, duty ratio and the relationship of overvoltage threshold are expressed as：
K in formulacFor power switch Duty ratio control coefficient,
WhereinudcIt is the DC bus-bar voltage that sample detecting obtains, udc_T1And udc_T2According to the resistance to of power device
Pressure and voltage margin determine.
A kind of wind electric converter low voltage ride through device based on hysteretic loop current control includes：DC bus chopper circuit,
Detecting signal unit, system control unit, Hysteresis control unit and chop control unit, system control unit and chop control list
Member, detecting signal unit are connected with hysteretic loop current control unit by hardwire, for transmitting the control signal believed；Signal is examined
It surveys unit to connect by hardwire with chop control unit, hysteretic loop current control unit, system control unit, for what will be acquired
Signal transmission gives each control unit；Chop control unit is connect with DC bus chopper circuit by hardwire, chop control
Unit provides driving protection signal to DC bus chopper circuit.
The DC bus chopper circuit includes power semiconductor switch and bleeder resistance, by chopper circuit control unit control
System, releases energy for DC bus-bar voltage.
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 system control unit completes the overall control of entire current transformer, according to the obtained power grid three-phase voltage of detection,
Positive sequence voltage is isolated, judges whether that low voltage failure of electric network occurs, and be responsible for calculating the grid-connected three-phase current given value of power grid；
The Hysteresis control unit is according to the calculated grid-connected three-phase current given value of system control unit and signal detection
The grid-connected three-phase current of unit detection generates the PWM control letters of net side current transformer power switch in conjunction with the stagnant loop bandwidth of setting
Number；
The chop control unit judges whether to need enabled straight according to the DC bus-bar voltage that detecting signal unit detects
Busbar chopper circuit is flowed, and is responsible for generating the control signal of control copped wave electric wave circuit power switch.
The present invention works as power grid by monitoring network voltage in real time and judging whether network voltage is less than electrical network low voltage threshold value
It when voltage is less than electrical network low voltage threshold value, is calculated according to network voltage and gives reactive current given value, by injecting nothing to power grid
Work(Current on Grid provides a supporting role, and helps power system restoration, advantageous to realize full power convertor when network voltage increases not
Off-grid is run, and successfully realizes that low voltage failure passes through；
When network voltage is less than electrical network low 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 low 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, when DC bus-bar voltage is more than DC bus first threshold time control
DC bus chopper circuit processed starts to act, and when DC bus-bar voltage is more than DC bus second threshold, chopping switch is opened completely
Logical, released energy current transformer off-grid operation caused by DC bus-bar voltage can be inhibited to rise sharply by resistance, further can be with
The current transformer caused by DC bus-bar voltage is more than operational envelope is avoided to damage.
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 low-voltage occurs, it is possible to authenticate the low electricity under the symmetrical and asymmetric two kinds of different situations of network voltage
Press failure, so control current transformer to it is grid-connected it is idle accordingly adjusted, and pass through low voltage failure.
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 low voltage traversing 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 low voltage failure occurs for network voltage, corresponding control unit controls net
Side current transformer and chopper circuit carry out low voltage crossing control to low voltage failure.
Fig. 2 is the low-voltage crossing controller composed structure schematic diagram of total power wind-force generating converter in embodiment,
Total power wind-force generating converter ontology is made of generator-side converter wear, DC bus and net side current transformer.Current transformer low-voltage is worn
More control device includes DC bus copped wave unit, 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 network voltage that detection obtains, and respectively obtains the positive and negative order components virtual value of network voltage, locks
Phase angle and the frequency of power grid are calculated according to power grid positive sequence voltage for phase ring.According to calculating power grid positive sequence voltage perunit value simultaneously
It is compared with electrical network low voltage threshold value, it is on the one hand enabled when power grid positive sequence voltage perunit value is higher than electrical network low voltage threshold value
Chop control unit, the first, second threshold of DC bus for the DC bus-bar voltage and setting that copped wave unit is obtained further according to detection
Value judges whether to drive the action of DC bus chopper circuit；On the other hand, system control unit is according to power grid positive sequence voltage perunit
Value is calculated that net side current transformer is active and reactive command, and the grid phase being calculated according to phaselocked loop inside control unit
Calculate net side hysteretic loop current control unit current-order, hysteretic loop current control unit according to current-order and detection obtain and
Net electric current generates the pwm control signal of control net side current transformer.
Be shown in Fig. 3 the embodiment of the present invention total power wind-force generating converter electrical network low voltage pass through control principle signal
Figure, when power grid positive sequence voltage perunit value is higher than electrical network low voltage threshold value, low to wear enabled switch and push position 1, 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。
It is low to wear enabled switch and push position 2 when power grid positive sequence voltage perunit value is less than electrical network low voltage threshold value, according to electricity
Net positive sequence voltage perunit value ug *, electrical network low 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 low 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 less than electrical network low voltage threshold value, DC bus-bar voltage may be because the low electricity of power grid
Press failure and it is over-pressed, at this moment DC bus chop control unit is according to the DC bus-bar voltage and DC bus-bar voltage detected in real time
Overvoltage threshold controls chopper circuit power switch, is controlled when DC bus-bar voltage is more than the first overvoltage threshold of DC bus-bar voltage
DC bus chopper circuit power switch is open-minded, and DC bus-bar voltage is more than that the first overvoltage threshold is more, and power switch conducting accounts for
Empty ratio is bigger, and chopping switch conducting dutycycle is linear with the first overvoltage threshold difference with DC bus-bar voltage, works as direct current
When busbar voltage meets or exceeds the second overvoltage threshold of DC bus-bar voltage, power switch is all open-minded.After power switch is opened,
DC bus will be released energy by letting out energy resistance.
Fig. 4-11 is that the total power wind-force generating converter of the embodiment of the present invention passes through operation in grid voltage sags
State diagram, the corresponding waveform of four test waveforms is followed successively by power grid three-phase voltage (V), grid-connected three-phase electricity from top to bottom in Fig. 4,5
Flow (A), DC bus-bar voltage (V) and the capacitive reactive power (kvar) for injecting power grid.
Fig. 4-7 corresponds to power grid three-phase voltage balance and falls, and Fig. 8-11 corresponds to unbalanced source voltage and falls.As can be seen that
In the case where grid balance and imbalance fall, current transformer can successfully pass through low voltage failure, and current transformer DC bus-bar voltage is less than
1300V, in safe range.Working together current transformer can be idle to power grid injection according to grid voltage sags situation, helps power grid extensive
It is multiple.After network voltage recovery, current transformer can restore nominal situation work, reduce idle injection, and colleague restores active output.Two
Unit low voltage crossing operating status figure illustrates the low voltage crossing proposed by the present invention based on hysteretic loop current control under kind operating mode
Control method can control total power wind-force generating converter and successfully pass through low voltage failure, ensure the safety and stability fortune of current transformer
Row.
Claims (9)
1. the wind electric converter low voltage traversing 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, respectively obtains the positive sequence point of network voltage
Amount and negative sequence component；
After obtaining network voltage positive-sequence component, the phase angle θ and frequencies omega of network voltage are calculated by voltage phaselocked loop；
Unbalanced source voltage degree and power grid positive sequence voltage perunit value is calculated；
Compare positive sequence voltage perunit value and electrical network low voltage threshold value, if being higher than low 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 less than low 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 higher than low 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 low voltage traversing control method according to claim 1 based on Hysteresis control, feature exist
In：It may be calculated as out unbalanced source voltage degree：
ε indicates unbalanced source voltage degree, u in formulagNIndicate negative sequence voltage virtual value, ugPIndicate that positive sequence voltage is effective
Value.
3. the wind electric converter low voltage traversing control method according to claim 1 based on Hysteresis control, feature exist
In：Power grid positive sequence voltage perunit value is calculated 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.
4. the wind electric converter low voltage traversing 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=1.5kQ·IN(0.9-u* g)
In formula, i* QIt indicates to give reactive current value, u* gIndicate power grid positive sequence voltage perunit value, u* gTIndicate the low electricity of network voltage
Press threshold value.u* gTIt is obtained according to concerned countries standard and system design objective, kQIndicate reactive balance penalty coefficient, kQBy power grid electricity
Degree of unbalancedness ε is pressed to determine, as ε ＜ 5%, kQ=1.
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.
5. the wind electric converter low voltage traversing control method according to claim 1 based on Hysteresis control, feature exist
In：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 low voltage threshold
Watt current value, iPmaxIndicate maximum given watt current calculated value.
6. the wind electric converter low voltage traversing control method according to claim 1 based on Hysteresis control, feature exist
In：The computational methods such as following formula of grid-connected three-phase current given value：
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.
7. the wind electric converter low voltage traversing 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, whereinudcIt is the DC bus-bar voltage that sample detecting obtains, udc_T1And udc_T2According to power device pressure resistance and
Voltage margin determines.
8. a kind of wind electric converter low voltage ride through device based on hysteretic loop current control, it is characterised in that：Including：DC bus
Chopper circuit, detecting signal unit, system control unit, Hysteresis control unit and chop control unit, system control unit with
Chop control unit, detecting signal unit and hysteretic loop current control unit are connected by hardwire；Detecting signal unit and copped wave
Control unit, hysteretic loop current control unit, system control unit are connected by hardwire；Chop control unit is cut with DC bus
Wave circuit is connected by hardwire.
9. the wind electric converter low voltage ride through device according to claim 8 based on hysteretic loop current control, feature exist
In：The DC bus chopper circuit includes power semiconductor switch and bleeder resistance, is controlled by chopper circuit control unit, is used
It releases energy in DC bus-bar voltage；
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 system control unit completes the overall control of entire current transformer, according to the power grid three-phase voltage that detection obtains, separation
Go out positive sequence voltage, judges whether that low voltage failure of electric network occurs, and be responsible for calculating the grid-connected three-phase current given value of power grid；
The 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 signal of net side current transformer power switch in conjunction with the stagnant loop bandwidth of setting；
The 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.
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