CN109449996A - High voltage ride through control method and device of converter and storage medium - Google Patents
High voltage ride through control method and device of converter and storage medium Download PDFInfo
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- CN109449996A CN109449996A CN201811645383.2A CN201811645383A CN109449996A CN 109449996 A CN109449996 A CN 109449996A CN 201811645383 A CN201811645383 A CN 201811645383A CN 109449996 A CN109449996 A CN 109449996A
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- H02J3/386—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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Abstract
The invention discloses a high voltage ride through control method and device of a converter and a storage medium. The high voltage ride through control method comprises the following steps: determining the current working state of the converter; if the current working state of the converter meets a preset high voltage ride through condition, calculating a power grid reference voltage according to the current power grid voltage; calculating a reactive current given reference value according to the reference voltage of the power grid, and providing inductive reactive current for the converter based on the reactive current given reference value; and calculating a given reference value of the direct-current bus voltage according to the given reactive current value, the active current of the converter and the power grid reference voltage, and regulating and controlling the direct-current bus voltage based on the given reference value of the direct-current bus voltage so that the port voltage of the converter meets the high-voltage ride-through requirement. By adopting the technical scheme in the embodiment of the invention, the on-load test requirement of high voltage ride through can be met, and the on-load voltage of the wind generating set is ensured to be not lower than the preset per unit value of the high voltage ride through.
Description
Technical field
The present invention relates to technical field of wind power generation more particularly to the high voltage crossing control methods and dress of a kind of current transformer
It sets, storage medium.
Background technique
Wind electric converter is the grid-connected core component of wind power generating set electric energy, and DC conversion is by the net side of current transformer
The alternating current feed-in power grid of fixed frequency.When high voltage occurs in power grid, current transformer net side output power is suppressed, bus electricity
Pressure lifting, trigger protection be easy to cause unit batch to shut down, are formed and impacted to power grid.As big wind power base passes through direct current spy
High pressure sends the investment of mode outside, and the frequency that high voltage operating condition occurs in power grid increases, it is desirable that unit must have high voltage crossing function
Energy.
Currently, current transformer can export inductive reactive power electric current when network voltage increases, hindered using inductive reactive power electric current in power grid
Pressure drop is formed on anti-, to reduce the demand to DC bus-bar voltage amplitude is promoted.
But the inventors of the present application found that the newest testing standard of high voltage crossing requires band to carry test, i.e. wind-force is sent out
The band load voltage of motor group is not lower than preset height and wears voltage per unit value, such as 1.3pu, that is to say, that current transformer output sense
Property it is idle after, pressure drop can be formed on electric network impedance, floating voltage is needed to be superimposed the pressure drop on the basis of 1.3pu, guarantee test
Point voltage is not less than 1.3pu.The active response of new standard requires tightened up, it is desirable that transient process is no more than 40ms, and transient state amplitude is not
50% beyond rated power, small-power section cannot have negative value, 5% of steady-state deviation no more than rated power.Using existing
It is impossible to meet the bands of high voltage crossing to carry test request for high voltage crossing control method in technology.
Summary of the invention
The embodiment of the invention provides the high voltage crossing control methods and device of a kind of current transformer, storage medium, can
The band for meeting high voltage crossing carries test request, guarantees that the band of wind power generating set carries voltage and wears voltage mark not less than preset height
Value.
In a first aspect, the embodiment of the present invention provides a kind of high voltage crossing control method of current transformer, comprising:
Determine the current working status of current transformer；
If it is determined that the current working status of current transformer is then to be calculated into high voltage crossing mode according to current electric grid voltage
Power grid reference voltage；
Reactive current is calculated according to power grid reference voltage and gives reference value, and reference value is given to unsteady flow based on reactive current
Device provides inductive reactive power electric current；
It is given that DC bus-bar voltage is calculated according to reactive current given value, the watt current of current transformer and power grid reference voltage
Reference value, and reference value is given based on the DC bus-bar voltage and regulates and controls DC bus-bar voltage, so that the port of the current transformer
Voltage meets preset high voltage crossing demand.
In a kind of possible embodiment of first aspect, the current working status of current transformer is determined, comprising: calculate electricity
The positive-sequence component of net voltage and negative sequence component and value；If being greater than first voltage threshold value with value and reaching for the first specified time,
Determine that current transformer enters high voltage crossing mode；And if in second voltage threshold value and reaching for the second specified time under value, it is determined that
Current transformer exits high voltage crossing mode；First voltage threshold value is greater than second voltage threshold value.
In a kind of possible embodiment of first aspect, power grid reference voltage is calculated according to network voltage, comprising: right
The negative sequence component of network voltage is weighted processing, obtains negative phase-sequence reference component；The positive-sequence component of network voltage and negative phase-sequence are joined
The sum of examination mark amount, as power grid reference voltage.
In a kind of possible embodiment of first aspect, the given reference of reactive current is calculated according to power grid reference voltage
Value, comprising: calculate power grid reference voltage and preset height wears the difference of voltage per unit value；By difference, the power network fluctuation factor and change
The product for flowing the rated current of device, gives reference value as reactive current.
In a kind of possible embodiment of first aspect, reference value is given based on reactive current and provides sense to current transformer
Property reactive current, comprising: giving reference value to reactive current is filtered, and it is given to reference reactive current to obtain first
Value；Amplitude limiting processing is carried out to reference reactive current given value to first, obtains second to reference reactive current given value；According to
Two provide inductive reactive power electric current to reference reactive current given value, to current transformer.
In a kind of possible embodiment of first aspect, according to the watt current of reactive current given value, current transformer
DC bus-bar voltage is calculated with power grid reference voltage and gives reference value, comprising: according to the watt current in current transformer, calculates unsteady flow
The active potential of device output；Reference value is given according to reactive current, calculates the idle potential of current transformer output；According to active electricity
Gesture, idle potential and power grid reference voltage are calculated DC bus-bar voltage and give reference value.
In a kind of possible embodiment of first aspect, reference value is given based on DC bus-bar voltage, regulates and controls direct current
Busbar voltage, comprising: control DC bus-bar voltage given value is incremented by, Zhi Daoda in the first predetermined period since current value
Reference value is given to DC bus-bar voltage.
In a kind of possible embodiment of first aspect, the given ginseng of reactive current is being calculated according to power grid reference voltage
After the step of examining value, this method further include: reference value is given according to the reactive current and calculates watt current amplitude limit value, and base
Amplitude limiting processing is carried out to the watt current that the current transformer exports in the watt current amplitude limit value；
It is given that DC bus-bar voltage is calculated according to reactive current given value, the watt current of current transformer and power grid reference voltage
The step of reference value includes:
The watt current and power grid reference voltage of current transformer after giving reference value, amplitude limiting processing according to reactive current calculate
DC bus-bar voltage gives reference value.
In a kind of possible embodiment of first aspect, after determining the current working status step of current transformer,
This method further include: if current transformer exits high voltage crossing mode, control DC bus-bar voltage given value in the second predetermined week
In phase, successively decrease since current value, until being restored to initial value；/ also, if current transformer exits high voltage crossing mode,
The reactive power for then controlling current transformer is restored to initial value, from constant power factor is based on, makes reactive power since initial value
It is incremented by, until the reactive power of current transformer reaches reactive power requirements；/ also, if current transformer exits high voltage crossing
Mode, then the watt current amplitude limit value for controlling current transformer are incremented by since current value, the maximum functional electricity until reaching current transformer
Stream；
Second aspect, the embodiment of the present invention provide a kind of high voltage crossing control device of current transformer, comprising:
State determining module, for determining the current working status of current transformer according to current electric grid voltage；
Network voltage computing module, if the current working status for current transformer is into high voltage crossing mode, root
Power grid reference voltage is calculated according to current electric grid voltage；
Reactive current calculates and operation control module, for calculating the given reference of reactive current according to power grid reference voltage
Value, and reference value is given based on reactive current and provides inductive reactive power electric current to current transformer；
Busbar voltage calculates and operation control module, for according to the watt current of reactive current given value, current transformer and
Power grid reference voltage calculates DC bus-bar voltage and gives reference value, and female based on the given reference value regulation direct current of DC bus-bar voltage
Line voltage, so that the port voltage of current transformer meets default high voltage crossing demand.
In a kind of possible embodiment of second aspect, which is arranged in inverter controller.
The third aspect, the embodiment of the present invention provide a kind of computer readable storage medium, are stored thereon with program, program quilt
Processor realizes the high voltage crossing control method of current transformer as described above when executing.
In embodiments of the present invention, determine that the current working status of the current transformer meets preset high voltage crossing condition
Afterwards, power grid reference voltage first can be calculated according to current electric grid voltage；Then, it is on the one hand calculated according to power grid reference voltage idle
Given value of current reference value, and reference value is given based on reactive current and provides inductive reactive power electric current to current transformer, to utilize idle electricity
Stream forms pressure drop on electric network impedance；On the other hand, DC bus-bar voltage is calculated according to reactive current given value and gives reference value,
And reference value is given based on DC bus-bar voltage and regulates and controls DC bus-bar voltage, the lifting of DC bus-bar voltage can be reduced to impedance
The demand of pressure drop, so that the port voltage (i.e. the grid-connected place's voltage of power grid) of current transformer be made to wear voltage mark not less than preset height
Value.
With it is in the prior art only can satisfy high voltage crossing when no load test requirement compared with, in the embodiment of the present invention
High voltage crossing control method can using reactive current on electric network impedance formed pressure drop while, guarantee wind-power electricity generation
The band of unit carries voltage and wears voltage per unit value not less than preset height, so that band when meeting high voltage crossing carries test request.
Detailed description of the invention
The present invention may be better understood from the description with reference to the accompanying drawing to a specific embodiment of the invention wherein,
The same or similar appended drawing reference indicates the same or similar feature.
Fig. 1 is the flow diagram of the high voltage crossing control method for the current transformer that one embodiment of the invention provides；
Fig. 2 is the computing block diagram of network voltage provided in an embodiment of the present invention；
Fig. 3 is the stagnant ring block diagram provided in an embodiment of the present invention determined for high voltage crossing state；
Fig. 4 is the selection schematic illustration of the weight coefficient Kn of network voltage negative sequence component provided in an embodiment of the present invention；
Fig. 5 is the selection schematic illustration of power network fluctuation factor K provided in an embodiment of the present invention；
Fig. 6 be another embodiment of the present invention provides current transformer high voltage crossing control method flow diagram；
Fig. 7 is the structural schematic diagram of the high voltage crossing control device of current transformer provided in an embodiment of the present invention.
Specific embodiment
The feature and exemplary embodiment of various aspects of the invention is described more fully below.In following detailed description
In, many details are proposed, in order to provide complete understanding of the present invention.
The embodiment of the present invention provides the high voltage crossing control method and device, storage medium of a kind of current transformer.Using this
Technical solution in inventive embodiments, band when can satisfy high voltage crossing carry test request, guarantee wind power generating set
Band, which carries voltage, to wear voltage per unit value not less than preset height.
Fig. 1 is the flow diagram of the high voltage crossing control method for the current transformer that one embodiment of the invention provides.Such as Fig. 1
Shown, which includes step 101 to step 104.
In a step 101, the current working status of the current transformer is determined.
Firstly, calculate network voltage positive-sequence component and negative sequence component and value.
Referring to fig. 2, the positive-sequence component of network voltageWherein, Ed+And Eq+Respectively power grid electricity
The d axis positive-sequence component and q axis positive-sequence component of pressure；The negative sequence component of network voltage Wherein, Ed-And Eq-
Respectively the d axis negative sequence component of network voltage and q axis negative sequence component；Eg_fFor EPAnd ENThe sum of component after low-pass filtered.
Then, stagnant ring matching is carried out to this and value, determination obtains the current working status of current transformer.
Refering to Fig. 3, if Eg_fGreater than first voltage threshold value (such as 1.1pu+0.015pu) and reached for the first specified time
(such as 2ms), it is determined that current transformer enters high voltage crossing mode.
If Eg_fUnder in second voltage threshold value (such as 1.1pu-0.043pu) and reach the second specified time (such as
2ms), it is determined that current transformer exits high voltage crossing mode.
When being increased due to network voltage asymmetry, positive sequence voltage amplitude is used in the presence of the operating condition that cannot reach judgment threshold
The mode of positive-sequence component and the sum of negative sequence component, it is ensured that current transformer is worn also responsive to height when asymmetry increases, to adapt to more
Multi-state.
In a step 102, if the current working status of current transformer is into high voltage crossing mode, according to network voltage
Calculate power grid reference voltage.
In one example, processing can be weighted to the negative sequence component of network voltage, obtains negative phase-sequence reference component, it will be electric
The positive-sequence component of net voltage and the sum of negative phase-sequence reference component are as power grid reference voltage.
Specifically, the calculation formula of power grid reference voltage Eg can indicate are as follows:
Eg=Ep+Kn × En (1)
Wherein, Ep is the positive-sequence component of network voltage, and En is the negative sequence component of network voltage, and Kn is the weight coefficient of En,
Kn obtains engineering value by emulating.
Below with reference to Fig. 4, the selection process and its meaning of Kn are illustrated.Wherein, circle 401 indicates power grid three-phase voltage pair
Power grid reference voltage vector when title, vector radius are Ep, and ellipse 402 indicates power grid reference when power grid three-phase voltage asymmetry
Voltage vector is an ellipse, and the long axis of ellipse 402 is the positive-sequence component of network voltage and the adduction Ep+En of negative sequence component, short
Axis is the positive-sequence component of network voltage and the poor Ep-En of negative sequence component.
Since the part beyond Ep+En will appear ovennodulation, busbar voltage fluctuation, such as according to oval 402 long axis values, nothing
Function current reference value is excessive, on test curve exist height wear during it is active exceed 5% risk, be unsatisfactory for standard, therefore, electricity
The reasonable value range of net reference voltage vector is between EP and EP+En.
Compared with the positive-sequence component Ep in the prior art for being based only upon network voltage formulates the given strategy of reactive current, this
Inventive embodiments are included in the negative sequence component En of network voltage, and increase a weighting coefficient Kn to weaken the weight of En, in bus
Voltage fluctuation and active calculated value find balance between increasing, while avoiding the occurrence of busbar voltage fluctuation problem and active calculated value
Beyond 5% specified active problem, more multi-state is enabled adaptation to.
In step 103, reactive current is calculated according to power grid reference voltage and gives reference value, and is given based on reactive current
Reference value provides inductive reactive power electric current to the current transformer.
In one example, it can first calculate power grid reference voltage and preset height wears the difference of voltage per unit value (such as 1.1)
Value, by the product of the rated current of the difference, the power network fluctuation factor and current transformer, gives reference value as reactive current.
Specifically, reactive current Iq* can be expressed as during high voltage crossing:
Iq*=-K × (Eg-1.1) × In (2)
Wherein, Eg is power grid reference voltage, and In is the rated current of current transformer, and K is the power network fluctuation factor, and "-" indicates electricity
Flow direction.In practice, reactive current of the K under multiple values can be obtained and give reference value Iq* and grid voltage reference valueThen compare Hardware Manual, by assess hardware receiving can, find the region that can be worked.
Below with reference to Fig. 5, the selection process and its constraint condition of K are illustrated.
Wherein, the idle axis of abscissa, ordinate indicate active axis, and 90 degree of phase angles are differed between idle axis and active axis.
During high voltage crossing, working region is constrained by network voltage, busbar voltage, current capacity three,
Curve AC indicates the limitation of maximum space vector, i.e. busbar voltage limits, and sector OAC is with maximum space vector voltage
For radius, OA and OC are the section that boundary line surrounds；
Curve BA indicates that maximum current capacity limit, sector DBA are using D as origin, and maximum apparent current is radius, idle
Axis and DA are the section that boundary line surrounds.
B point place has current capacity to be all used to send out idle, and therefore, curve AC, curve BC and idle axis envelope go out high electricity
Stability region ABC when current transformer net side can be run when pressure, that is to say, that the value of K needs and stability region ABC phase
Match.
In another example, reference value Iq* first can be given to reactive current and be filtered and (for example be 5.5Hz's
Low-pass filtering), first is obtained to reference reactive current given value Iq*_Ref1；Be then based on default clipping section, to first to
Amplitude limiting processing is carried out with reference to reactive current given value Iq*_Ref1, obtains second to reference reactive current given value Iq*_Ref2；
Inductive reactive power electric current is provided to current transformer to reference reactive current given value Iq*_Ref2 according to second.Wherein, described pre- to limit
Width section is (Iq*, 0), and Iq* is calculated by formula (2).
At step 104, direct current is calculated according to reactive current given value, the watt current of current transformer and power grid reference voltage
Busbar voltage gives reference value, and gives reference value based on DC bus-bar voltage and regulate and control DC bus-bar voltage, so that current transformer
Port voltage meets preset high voltage requirements.
In one example, it can detecte the watt current Ip in current transformer, the active electricity of current transformer output calculated according to Ip
Gesture ω LId；Then reference value Iq* is given according to reactive current, calculates the idle potential of current transformer outputLast basis has
Function potential ω LId, idle potentialWith power grid reference voltage Eg, DC bus-bar voltage is calculated and gives reference value
Specifically, DC bus-bar voltage during high voltage crossingIt can be expressed as:
Wherein, Id is watt current, and Iq* is reactive current, and L is filter inductance value, and ω is power frequency angular frequency, and Kr is mother
Line voltage usage factor.
In another example, mode can be lifted using RAMP by distribution bus-bar voltage reference valueIt distributes to current transformer,
That is, control DC bus-bar voltage given value in the first predetermined period (such as 10ms), is incremented by, directly since current value
It reaches DC bus-bar voltage and gives reference valueIt can be avoided capacitor charging under small-power using RAMP lifting mode to cause
Bear function problem.
In embodiments of the present invention, after determining that the current working status of current transformer meets preset high voltage crossing condition,
Power grid reference voltage first can be calculated according to current electric grid voltage；Then, idle electricity is on the one hand calculated according to power grid reference voltage
Given reference value is flowed, and reference value is given based on reactive current and provides inductive reactive power electric current to current transformer, to utilize reactive current
Pressure drop is formed on electric network impedance；On the other hand, DC bus-bar voltage is calculated according to reactive current given value and gives reference value, and
Reference value regulation DC bus-bar voltage is given based on DC bus-bar voltage, the lifting of DC bus-bar voltage can be reduced to impedance pressure
The demand of drop, so that the port voltage (i.e. the grid-connected place's voltage of power grid) of current transformer be made to wear voltage per unit value not less than preset height.
With it is in the prior art only can satisfy high voltage crossing when no load test requirement compared with, in the embodiment of the present invention
High voltage crossing control method can using reactive current on electric network impedance formed pressure drop while, guarantee wind-power electricity generation
The band of unit carries voltage and wears voltage per unit value not less than preset height, so that band when meeting high voltage crossing carries test request.
It further, can also be according to the given reference of reactive current to avoid active power during high voltage crossing excessively high
Value calculates watt current amplitude limit value, i.e., how active maximum allowable hair is so, and is exported based on watt current amplitude limit value to current transformer
Watt current carry out amplitude limiting processing, then refering to formula (3), after giving reference value Iq*, amplitude limiting processing according to reactive current
The watt current and power grid reference voltage E of current transformergIt calculates DC bus-bar voltage and gives reference value
Specifically, active power amplitude limit value is during high voltage crossingWherein, Is is the high voltage crossing phase
Between current transformer maximum apparent current, Iq* be high voltage crossing during current transformer reactive requirement value (i.e. nothing during high voltage crossing
Function given value of current reference value).
In addition, the embodiment of the present invention gives the Parameter reconstruction method after high voltage crossing mode exits.
In one example, if current transformer exits high voltage crossing mode, it can control the use of DC bus-bar voltage given value
RAMP mode is restored, and specifically, can successively decrease since current value, in the second predetermined period (such as 3s) until being restored to
Initial value so that current transformer completes transition from high voltage crossing state to normal operating conditions, avoid voltage transient restore and
Active fluctuation caused by capacitor discharges.
In another example, if current transformer exits high voltage crossing mode, the reactive power that can control current transformer is restored
To initial value, it is based on constant power factor, is incremented by reactive power since initial value, until the reactive power of current transformer reaches
Reactive power requirements, so that current transformer completes the transition from high voltage crossing state to normal operating conditions, wherein fixed function
The value of rate factor is the power factor before electric network fault occurs.In embodiments of the present invention, it is exited using constant power factor
Mode can enhance weak grid adaptability.
In another example, if current transformer exits high voltage crossing mode, the watt current amplitude limit value of current transformer is controlled
It is incremented by since current value, the maximum operating currenbt until reaching current transformer, so that current transformer is completed from high voltage crossing state
To the transition of normal operating conditions.
In practice, it encounters after low voltage crossing occurs, the operating condition of high voltage crossing immediately occurs, should make an immediate response high voltage
Demand is passed through, transient high voltage caused by avoiding the problem that because of low voltage crossing leads to unit batch off line.
Fig. 6 be another embodiment of the present invention provides current transformer high voltage crossing control method flow diagram, such as
Shown in Fig. 6, which includes step 601 to step 610, for the high voltage in the embodiment of the present invention
Traversing control method is illustrated.
In step 601, three-phase power grid voltage is acquired.
In step 602, network voltage positive-sequence component, negative sequence component are extracted and carries out low-pass filtering.
In step 603, calculate network voltage positive-sequence component and negative sequence component and Eg_f.
In step 604, judge Eg_f > 1.1pu+0.015pu and timing is greater than 2ms, if it sets up, if so, then hold
Row step 605, otherwise, return step 601.
In step 605, into high voltage crossing state.
In step 606, given reactive current, watt current limitation and busbar voltage reference value are calculated.
In step 607, inductive reactive power electric current, RAMP lifting bus voltage to bus electricity are provided according to reactive current is given
Press reference value.
It is synchronous to execute step 608 when executing step 604.
In step 608, judge Eg_f > 1.1pu-0.043pu and timing is greater than 5ms, if it sets up, if so, then hold
Row step 609, otherwise, return step 601.
In step 609, high voltage crossing state is exited.
In step 610, RAMP restores reactive current, RAMP restores watt current and RAMP restores DC bus-bar voltage.
Fig. 7 is the structural schematic diagram of the high voltage crossing control device of current transformer provided in an embodiment of the present invention, such as Fig. 7 institute
Show, the high voltage crossing control device include state determining module 701, network voltage computing module 702, reactive current calculate and
Operation control module 703 and busbar voltage calculating and operation control module 704.
Wherein, state determining module 701 is used to determine according to current electric grid voltage the current working status of current transformer；
If network voltage computing module 702 for the current working status of current transformer be into high voltage crossing mode,
Power grid reference voltage is calculated according to current electric grid voltage；
Reactive current calculates and operation control module 703 is used to calculate the given reference of reactive current according to power grid reference voltage
Value, and reference value is given based on reactive current and provides inductive reactive power electric current to current transformer；
Busbar voltage calculates and operation control module 704 is used for the watt current according to reactive current given value, current transformer
DC bus-bar voltage is calculated with power grid reference voltage and gives reference value, and reference value is given based on DC bus-bar voltage and regulates and controls direct current
Busbar voltage, so that the port voltage of current transformer meets preset high voltage crossing demand.
It should be noted that the high voltage crossing control device in the embodiment of the present invention can be with independent control device
Form is set in current transformer, and the function of the high voltage crossing control device can also be executed by the controller in current transformer
Can, it is not limited herein.
In addition, the embodiment of the present invention also provides a kind of computer readable storage medium, it is stored thereon with program, program is located
Reason device realizes the high voltage crossing control method of current transformer as described above when executing.
It should be clear that all the embodiments in this specification are described in a progressive manner, each embodiment it
Between the same or similar part may refer to each other, the highlights of each of the examples are it is different from other embodiments it
Place.For device embodiment, related place may refer to the declaratives of embodiment of the method.Not office of the embodiment of the present invention
It is limited to particular step and structure described above and shown in figure.Those skilled in the art can understand the present invention in fact
It after the spirit for applying example, is variously modified, modification and addition, or the sequence between changing the step.Also, it is risen in order to concise
See, omits the detailed description to known method technology here.
Functional block shown in structures described above block diagram can be implemented as hardware, software, firmware or their group
It closes.When realizing in hardware, it may, for example, be electronic circuit, specific integrated circuit (ASIC), firmware appropriate, insert
Part, function card etc..When being realized with software mode, the element of the embodiment of the present invention is used to execute the program of required task
Or code segment.Perhaps code segment can store in machine readable media program or the data by carrying in carrier wave are believed
It number is sent in transmission medium or communication links." machine readable media " may include be capable of storage or transmission information any
Medium.The example of machine readable media includes electronic circuit, semiconductor memory devices, ROM, flash memory, erasable ROM
(EROM), floppy disk, CD-ROM, CD, hard disk, fiber medium, radio frequency (RF) link, etc..Code segment can via such as because
The computer network of special net, Intranet etc. is downloaded.
The embodiment of the present invention can be realized in other specific forms, without departing from its spirit and essential characteristics.For example, special
Determining algorithm described in embodiment can be modified, and system architecture is without departing from the substantially smart of the embodiment of the present invention
Mind.Therefore, current embodiment is all counted as being exemplary rather than limited, the model of the embodiment of the present invention in all respects
It encloses by appended claims rather than foregoing description defines, also, falls into the meaning of claim and complete in the range of equivalent
Portion changes all to be included among the range of the embodiment of the present invention.
Claims (12)
1. a kind of high voltage crossing control method of current transformer characterized by comprising
Determine the current working status of the current transformer；
If the current working status of the current transformer is to calculate power grid reference according to network voltage into high voltage crossing mode
Voltage；
According to the power grid reference voltage calculate reactive current give reference value, and based on the reactive current give reference value to
The current transformer provides inductive reactive power electric current；
DC bus is calculated according to the reactive current given value, the watt current of the current transformer and the power grid reference voltage
Voltage gives reference value, and gives reference value based on the DC bus-bar voltage and regulate and control DC bus-bar voltage, so that the unsteady flow
The port voltage of device meets preset high voltage crossing demand.
2. the method according to claim 1, wherein the current working status of the determination current transformer, packet
It includes:
Calculate the network voltage positive-sequence component and negative sequence component and value；
If described and value is greater than first voltage threshold value and reached for the first specified time, it is determined that the current transformer enters the high electricity
Press to wear more mode；
If in second voltage threshold value and reaching for the second specified time under described and value, it is determined that the current transformer exits the high electricity
Press to wear more mode；
The first voltage threshold value is greater than the second voltage threshold value.
3. the method according to claim 1, wherein described calculate power grid reference voltage, packet according to network voltage
It includes:
Processing is weighted to the negative sequence component of the network voltage, obtains negative phase-sequence reference component；
By the sum of the positive-sequence component of the network voltage and the negative phase-sequence reference component, as the power grid reference voltage.
4. the method according to claim 1, wherein described calculate reactive current according to the power grid reference voltage
Given reference value, comprising:
It calculates the power grid reference voltage and preset height wears the difference of voltage per unit value；
It is given as the reactive current by the product of the rated current of the difference, the power network fluctuation factor and the current transformer
Reference value.
5. the method according to claim 1, wherein described give reference value to described based on the reactive current
Current transformer provides inductive reactive power electric current, comprising:
Reference value is given to the reactive current to be filtered, and obtains first to reference reactive current given value；
Amplitude limiting processing is carried out to reference reactive current given value to described first, obtains second to reference reactive current given value；
According to described second to reference reactive current given value, Xiang Suoshu current transformer provides inductive reactive power electric current.
6. the method according to claim 1, wherein described according to the reactive current given value, the unsteady flow
The watt current of device and the power grid reference voltage calculate DC bus-bar voltage and give reference value, comprising:
According to the watt current in the current transformer, the active potential of the current transformer output is calculated；
Reference value is given according to the reactive current, calculates the idle potential of the current transformer output；
According to the active potential, the idle potential and the power grid reference voltage, the DC bus-bar voltage is calculated
Given reference value.
7. the method according to claim 1, wherein it is described based on the DC bus-bar voltage give reference value,
Regulate and control DC bus-bar voltage, comprising:
The DC bus-bar voltage given value is controlled in the first predetermined period, is incremented by since current value, it is described until reaching
DC bus-bar voltage gives reference value.
8. the method according to claim 1, wherein calculating idle electricity according to the power grid reference voltage described
After the step of flowing given reference value further include:
Reference value is given according to the reactive current and calculates watt current amplitude limit value, and based on the watt current amplitude limit value to institute
The watt current for stating current transformer output carries out amplitude limiting processing；
It is described that direct current is calculated according to the reactive current given value, the watt current of the current transformer and the power grid reference voltage
Busbar voltage give reference value the step of include:
The watt current and power grid reference of the current transformer after giving reference value, amplitude limiting processing according to the reactive current
Voltage calculates DC bus-bar voltage and gives reference value.
9. method according to claim 1-8, which is characterized in that in the current work of the determination current transformer
After making state step further include:
If the current transformer exits the high voltage crossing mode, it is predetermined second to control the DC bus-bar voltage given value
In period, successively decrease since current value, until being restored to initial value；
If/also, the current transformer exits the high voltage crossing mode, the reactive power for controlling the current transformer is extensive
Initial value is arrived again, and is based on constant power factor, is incremented by the reactive power since the initial value, until the unsteady flow
The reactive power of device reaches reactive power requirements；
If/also, the current transformer exits the high voltage crossing mode, control the current transformer watt current limit
Amplitude is incremented by since current value, the maximum operating currenbt until reaching the current transformer.
10. a kind of high voltage crossing control device of current transformer characterized by comprising
State determining module, for determining the current working status of the current transformer；
Network voltage computing module, if the current working status for the current transformer is into high voltage crossing mode, root
Power grid reference voltage is calculated according to the current electric grid voltage；
Reactive current calculates and operation control module, for calculating the given reference of reactive current according to the power grid reference voltage
Value, and reference value is given based on the reactive current and provides inductive reactive power electric current to the current transformer；
Busbar voltage calculates and operation control module, for the active electricity according to the reactive current given value, the current transformer
Stream and the power grid reference voltage calculate DC bus-bar voltage and give reference value, and based on the given reference of the DC bus-bar voltage
Value regulation DC bus-bar voltage, so that the port voltage of the current transformer.
11. device according to claim 10, which is characterized in that described device is arranged in inverter controller.
12. a kind of computer readable storage medium, is stored thereon with program, which is characterized in that real when program is executed by processor
Now such as the high voltage crossing control method of the described in any item current transformers of claim 1-9.
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