CN109067222A - A kind of IGBT control method based on MMC-HVDC - Google Patents
A kind of IGBT control method based on MMC-HVDC Download PDFInfo
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- CN109067222A CN109067222A CN201810888606.1A CN201810888606A CN109067222A CN 109067222 A CN109067222 A CN 109067222A CN 201810888606 A CN201810888606 A CN 201810888606A CN 109067222 A CN109067222 A CN 109067222A
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
- H02M7/4835—Converters with outputs that each can have more than two voltages levels comprising two or more cells, each including a switchable capacitor, the capacitors having a nominal charge voltage which corresponds to a given fraction of the input voltage, and the capacitors being selectively connected in series to determine the instantaneous output voltage
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The IGBT control method based on MMC-HVDC that the present invention provides a kind of, comprising: according to the current working status of each submodule on the same bridge arm of acquisition, each submodule is divided into investment group and excision group；Each submodule for throwing enrolled each submodule and excision group is ranked up according to the size of submodule voltage respectively；The submodule number in expected investment submodule number and investment group that will acquire makes the difference generation investment submodule difference；According to the bridge arm current direction selection conditional relationship formula of bridge arm where each submodule；Optimal cross-over value is generated according to investment submodule difference and conditional relationship formula；The submodule bulk state of enrolled submodule bulk state and excision group is thrown according to the adjustment of optimal cross-over value.The application has the IGBT average frequency of switching for adjusting bridge arm submodule capacitor voltage fluctuation amplitude (i.e. equalizing effect), optimizing MMC valve group, the service life for improving IGBT, the loss for reducing MMC valve group and the beneficial effect for improving Engineering Reliability.
Description
Technical field
The present invention relates to technical field of electric power system control more particularly to a kind of IGBT controlling parties based on MMC-HVDC
Method.
Background technique
Modularization multi-level converter D.C. high voltage transmission (MMC-HVDC, modular multilevel converter
Based HVDC) from 2003 once propose just become high voltage direct current (HVDC) field of power transmission research hotspot.MMC has voltage
The good characteristic of source inverter, can be realized four quadrant running, can and reactive power active with independent control, may operate in nothing
Under the inverter mode of source.In addition, MMC uses modularized design and Redundant Control, it is not only convenient for dilatation and maintenance, and has output electricity
The advantages that voltage level number is more, and harmonic content is low, and switching loss is low, and fault ride-through capacity is strong, therefore MMC-HVDC becomes high straightening
The development trend for flowing (HVDC) field of power transmission is applied in terms of large-scale wind power integration, urban distribution network increase-volume, electric power
It has a extensive future.
Insulated gate bipolar transistor (IGBT) switching frequency of MMC Neutron module is the important ginseng of MMC design and operation
Number, the loss of system can be reduced by reducing switching frequency, increased capacitor service life and reduced system operation cost.This requires
Submodule capacitor voltage Balance route will not only consider submodule capacitor voltage fluctuation amplitude (equalizing effect), also take into account switch
Frequency.
The prior art one puts into voltage further according to bridge arm current direction selection using being directly ranked up to capacitance voltage
Highest or minimum several modules, balance global voltage, and this method is easy to accomplish, are widely adopted, referred to as conventional method,
Although submodule equalizing effect is fine, switching phenomenon is serious repeatedly for module, causes switching frequency very high.
The prior art two avoids the unnecessary switching phenomenon repeatedly of IGBT by introducing double holding factors.This method has
Effect reduces submodule switching frequency, but operand is larger, and it is more to occupy resource, and is unsuitable for FPGA realization.
Therefore how in submodule capacitor voltage Balance route, submodule switching frequency is effectively reduced and has pressure effect concurrently
Fruit is current technical problem urgently to be resolved.
Summary of the invention
In order to solve defect in the prior art, the IGBT control method based on MMC-HVDC that the present invention provides a kind of,
By the way that submodule sorts according to investment/excision status packet, it is then based on investment/submodule voltage difference of excision group, bridge arm
Current direction and equalizing effect generate the corresponding optimal cross-over value of investment/excision group, and the application has optimization MMC valve group
IGBT average frequency of switching, the service life for improving IGBT, the loss for reducing MMC valve group and the beneficial effect for improving Engineering Reliability
Fruit.
To achieve the goals above, the IGBT control method based on MMC-HVDC that the present invention provides a kind of, this includes:
According to the current working status of each submodule on the same bridge arm of acquisition, each submodule is divided into investment
Group and excision group；Each submodule for throwing enrolled each submodule and the excision group is respectively according to the size of submodule voltage
It is ranked up；
It is poor that expected investment submodule number and the submodule number in the investment group that will acquire make the difference generation investment submodule
Value；
According to the bridge arm current direction selection conditional relationship formula of bridge arm where each submodule；
Optimal cross-over value is generated according to the investment submodule difference and the conditional relationship formula；
The submodule bulk state of the enrolled submodule bulk state of the throwing and the excision group is adjusted according to the optimal cross-over value.
The present invention also provides a kind of computer equipment, including memory, processor and storage on a memory and can located
The computer program run on reason device, the processor perform the steps of when executing the computer program
According to the current working status of each submodule on the same bridge arm of acquisition, each submodule is divided into investment
Group and excision group；Each submodule for throwing enrolled each submodule and the excision group is respectively according to the size of submodule voltage
It is ranked up；
It is poor that expected investment submodule number and the submodule number in the investment group that will acquire make the difference generation investment submodule
Value；
According to the bridge arm current direction selection conditional relationship formula of bridge arm where each submodule；
Optimal cross-over value is generated according to the investment submodule difference and the conditional relationship formula；
The submodule bulk state of the enrolled submodule bulk state of the throwing and the excision group is adjusted according to the optimal cross-over value.
The present invention also provides a kind of computer readable storage mediums, are stored thereon with computer program, the computer journey
It is performed the steps of when sequence is executed by processor
According to the current working status of each submodule on the same bridge arm of acquisition, each submodule is divided into investment
Group and excision group；Each submodule for throwing enrolled each submodule and the excision group is respectively according to the size of submodule voltage
It is ranked up；
It is poor that expected investment submodule number and the submodule number in the investment group that will acquire make the difference generation investment submodule
Value；
According to the bridge arm current direction selection conditional relationship formula of bridge arm where each submodule；
Optimal cross-over value is generated according to the investment submodule difference and the conditional relationship formula；
The submodule bulk state of the enrolled submodule bulk state of the throwing and the excision group is adjusted according to the optimal cross-over value.
A kind of IGBT control method based on MMC-HVDC provided by the invention, comprising: according on the same bridge arm of acquisition
Each submodule current working status, each submodule is divided into investment group and excision group；It is described to throw enrolled each son
Each submodule of module and the excision group is ranked up according to the size of submodule voltage respectively；Expected investment that will acquire
Submodule number in number of modules and the investment group makes the difference generation investment submodule difference；According to bridge arm where each submodule
Bridge arm current direction selection conditional relationship formula；Optimal friendship is generated according to the investment submodule difference and the conditional relationship formula
Change value；The submodule bulk state of the enrolled submodule bulk state of the throwing and the excision group is adjusted according to the optimal cross-over value.This
Application by the way that submodule is sorted according to investment/excision status packet, be then based on investment/excision group submodule voltage difference,
Bridge arm current direction and equalizing effect generate the technical solution of the corresponding optimal cross-over value of investment/excision group, have optimization
The IGBT average frequency of switching of MMC valve group, the service life for improving IGBT, the loss for reducing MMC valve group and raising engineering are reliable
The beneficial effect of property.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is modularization multi-level converter topological diagram；
Fig. 2 is half-bridge sub-modular structure schematic diagram；
Fig. 3 is full-bridge sub-modular structure schematic diagram；
Fig. 4 is a kind of flow chart of IGBT control method based on MMC-HVDC of the application；
Fig. 5 is the flow chart of the IGBT control method based on MMC-HVDC in one embodiment of the application；
Fig. 6 is the flow chart of the IGBT control method based on MMC-HVDC in another embodiment of the application.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
About " first " used herein, " second " ... etc., not especially censure the meaning of order or cis-position,
Also non-to limit the present invention, only for distinguishing with the element of same technique term description or operation.
It is open term, i.e., about "comprising" used herein, " comprising ", " having ", " containing " etc.
Mean including but not limited to.
About it is used herein " and/or ", including any of the things or all combination.
Fig. 1 be modularization multi-level converter topological diagram, as shown in Figure 1, modularization multi-level converter have bridge arm AU,
Six bridge arm BU, bridge arm CU, bridge arm AD, bridge arm BD and bridge arm CD bridge arms, each bridge arm is by submodule SM1~SMnIt constitutes.?
Under normal release operating condition, the submodule SM of each bridge arm1~SMnThere are bypass, excision and investment three state.When submodule has event
When barrier occurs, valve control issues bypass instruction to submodule, and submodule by-pass switch K closure makes the submodule of failure be in bypass shape
The capacitance voltage of state, the submodule of failure is in self discharge state, and the submodule of the failure (is in side in this operation
The submodule of line state) not further into investment or excision state.Fig. 2 is half-bridge sub-modular structure schematic diagram, and Fig. 3 is full-bridge
Modular structure schematic diagram.When submodule is in excision state, as shown in Fig. 2, half-bridge submodule triggers T2, as shown in figure 3, entirely
When bridge submodule triggers T1 and T3 or T2 and T4, capacitance voltage only discharges to the discharge resistance in submodule；It is in submodule
When investment state, as shown in Fig. 2, half-bridge submodule trigger T1, as shown in figure 3, full-bridge submodule just put into triggering T1 and T4 or
When negative investment triggering T2 and T3, submodule includes being charged and discharged two states.By taking full-bridge submodule as an example, as shown in Figure 1, this
When the direction Iarm be positive.If submodule is positive investment at this time, though capacitance voltage discharges to the discharge resistance in module, bridge arm
Electric current charges to module；The investment if submodule is negative, submodule capacitor voltage are also wanted in addition to discharging the discharge resistance in module
Externally electric discharge.
In view of the deficiencies in the prior art, the IGBT control method based on MMC-HVDC that the present invention provides a kind of,
Its flow chart as shown in figure 4, this method comprises:
S101: according to the current working status of each submodule on the same bridge arm of acquisition, each submodule is divided into throwing
Enter group and excision group.Wherein, each submodule of enrolled each submodule and excision group is thrown respectively according to the size of submodule voltage
It is ranked up.
S102: it is poor that expected investment submodule number and the submodule number in investment group that will acquire make the difference generation investment submodule
Value.
S103: according to the bridge arm current direction selection conditional relationship formula of bridge arm where each submodule.
S104: optimal cross-over value is generated according to investment submodule difference and conditional relationship formula.
S105: the submodule bulk state of enrolled submodule bulk state and excision group is thrown according to the adjustment of optimal cross-over value.
Process as shown in Figure 4 it is found that the application first according to the current work of each submodule on the same bridge arm of acquisition
Make state, each submodule is divided into investment group and excision group, wherein throws each submodule of enrolled each submodule and excision group
It is ranked up respectively according to the size of submodule voltage；MMC-HVDC modulation technique is recycled to calculate expected investment of acquisition
The difference of submodule number thing in number of modules and investment group puts into submodule difference；Again by judging that the bridge arm of current bridge arm is electric
Stream direction determines the charge or discharge state of capacitor in current bridge arm, selects corresponding conditional relationship formula；According to investment submodule
Difference and the conditional relationship formula of selection generate optimal cross-over value, finally throw enrolled submodule number according to the adjustment of optimal cross-over value
And the submodule number of excision group, so that it is determined that the trigger pulse of each submodule.The application, which has, adjusts bridge arm submodule capacitor
Voltage fluctuation amplitude (i.e. equalizing effect), the IGBT average frequency of switching for optimizing MMC valve group, the service life for improving IGBT, drop
The loss of low MMC valve group and the beneficial effect for improving Engineering Reliability.
In order to make those skilled in the art be better understood by the present invention, a more detailed embodiment is set forth below,
As shown in figure 5, the embodiment of the present invention provides a kind of IGBT control method based on MMC-HVDC, method includes the following steps:
S201: according to the current working status of each submodule on the same bridge arm of acquisition, each submodule is divided into throwing
Enter group and excision group.Each submodule of enrolled each submodule and excision group will wherein be thrown respectively according to the size of submodule voltage
It is ranked up.
When it is implemented, the current working status of each submodule on same bridge arm obtained, and according to current work
Make state and each submodule on current bridge arm is divided into investment group and excision group.
Enrolled each submodule will be thrown to arrange according to the sequence of corresponding submodule voltage from big to small, while group will be cut off
Each submodule arranged according to corresponding submodule voltage is small to big sequence.Throw each son of enrolled each submodule and excision group
The size according to submodule voltage of module is ranked up and can be consistent, can also be inconsistent, and invention is not limited thereto.
S202: it is poor that expected investment submodule number and the submodule number in investment group that will acquire make the difference generation investment submodule
Value.
Wherein, the expected investment submodule number of acquisition and the difference of the submodule number in investment group are investment submodule difference DELTA
N。
When it is implemented, obtaining expected investment submodule number using MMC-HVDC modulation technique, invention is not limited thereto.
S203: according to the bridge arm current direction selection conditional relationship formula of bridge arm where each submodule.
Conditional relationship formula includes: first condition relational expression and second condition relational expression.
Wherein, first condition relationship are as follows: the submodule voltage of enrolled current sequence number and the corresponding sequence of excision group are thrown in judgement
Number the difference of submodule voltage whether be less than preset submodule voltage fluctuation threshold value.
Second condition relationship are as follows: judge the submodule voltage of the current sequence number of excision group with throw the son of enrolled corresponding serial number
Whether the difference of module voltage is less than preset submodule voltage fluctuation threshold value.
As shown in Fig. 2, step S203 is specifically executed includes:
S301: when the bridge arm current direction of bridge arm is charging current direction where each submodule, first condition is selected to close
It is formula.
When it is implemented, first condition relational expression is shown in formula (1):
TMAXk+1-QMINk+1< Δ U (1)
Wherein TMAXk+1For investment group Neutron module voltage sort from large to small in (k+1) a maximum submodule electricity
Pressure, QMINk+1For excision group Neutron module voltage sort from small to large in (k+1) a the smallest submodule voltage, Δ U is
Preset submodule voltage fluctuation threshold value, k are the i.e. optimal cross-over value of smallest positive integral for meeting formula (1), and the value of k is 0,1,
2 ... N, N are the integer more than or equal to 0.
S302: when the bridge arm current direction of bridge arm is discharge current direction where each submodule, second condition is selected to close
It is formula.
When it is implemented, shown in second condition relational expression such as formula (2):
QMAXk+1-TMINk+1< Δ U (2)
Wherein, QMAXk+1For excision group Neutron module voltage sort from small to large in (k+1) a maximum submodule
Voltage, TMINk+1For investment group Neutron module voltage sort from large to small in (k+1) a the smallest submodule voltage, Δ U
For preset submodule voltage fluctuation threshold value, k is the i.e. optimal cross-over value of smallest positive integral for meeting formula (2), and the value of k is 0,1,
2 ... N, N are the integer more than or equal to 0.
Above-mentioned first condition relational expression and second condition relational expression are by adjusting bridge arm submodule capacitor voltage in the application
Fluctuation threshold Δ U realizes technology of pressure equalization effect, while by determining that the optimal cross-over value k of the smallest integer optimizes MMC valve group
IGBT average frequency of switching, realizing reduces IGBT average frequency of switching, improves the service life of IGBT and reduces MMC valve group
The technical effect of loss.
S204: optimal cross-over value is generated according to investment submodule difference and conditional relationship formula.
The specific implementation procedure of step S204 includes:
(1) when the bridge arm current direction of bridge arm where each submodule is charging current direction, the implementation of step S204
Journey is as follows:
When putting into submodule difference equal to zero, the first optimal cross-over value is generated according to first condition relational expression.
When it is implemented, setting the first optimal cross-over value as k1, then by first condition as investment submodule difference DELTA N=0
Relational expression (1) is converted to formula (3), generates the first optimal cross-over value k1 according to formula (3).
TMAXk1+1-QMINk1+1< Δ U (3)
Wherein, TMAXk1+1For investment group Neutron module voltage sort from large to small in (k1+1) a maximum submodule
Block voltage, QMINk1+1For excision group Neutron module voltage sort from small to large in (k1+1) a the smallest submodule voltage,
Δ U is preset submodule voltage fluctuation threshold value, and k1 is the optimal cross-over value of smallest positive integral i.e. first for meeting formula (3), k1's
Value is 0,1,2 ..., and N, N are the integer more than or equal to zero.
It is raw according to first condition relational expression and the absolute value for putting into submodule difference when putting into submodule difference less than zero
At the second optimal cross-over value.
When it is implemented, setting the second optimal cross-over value when putting into submodule difference DELTA N < 0 as k2, submodule will be put into
Block absolute difference | Δ N | it is corresponding | Δ N | it is a throw the corresponding submodule of enrolled maximal submodule voltage and be preset as excision fill
First condition relational expression (1) is then converted to formula (4) by electricity condition, generates the second optimal cross-over value k2 according to formula (4).
TMAXk2+|ΔN|+1-QMINk2+1< Δ U (4)
Wherein TMAXk2+|ΔN|+1For investment group Neutron module voltage sort from large to small in (k2+ | Δ N |+1) it is a most
Big submodule voltage, QMINk2+1For excision group Neutron module voltage sort from small to large in (k2+1) a the smallest son
Module voltage, Δ U are preset submodule voltage fluctuation threshold value, and k2 is the optimal friendship of smallest positive integral i.e. second for meeting formula (4)
Value is changed, the value of k2 is 0,1,2 ..., and N, N are the integer integer more than or equal to 0, | Δ N | for the absolute of investment submodule difference
Value.
It is raw according to first condition relational expression and the absolute value for putting into submodule difference when putting into submodule difference greater than zero
At the optimal cross-over value of third.
When it is implemented, setting the optimal cross-over value of third when putting into submodule difference DELTA N >=0 as k3, submodule will be put into
The absolute value of block difference | Δ N | corresponding | Δ N | the corresponding submodule of minimum submodule voltage of a excision group is set as putting into
First condition relational expression (1) is then converted to formula (5) by charged state, generates the optimal cross-over value k3 of third according to formula (5).
TMAXk3+1-QMINk3+|ΔN|+1< Δ U (5)
Wherein TMAXk3+1For investment group Neutron module voltage sort from large to small in (k3+1) a maximum submodule
Voltage, QMINk3+|ΔN|+1For excision group Neutron module voltage sort from small to large in a the smallest submodule of (k3+ | Δ N |+1)
Block voltage, Δ U are preset submodule voltage fluctuation threshold value, and k3 is the optimal exchange of smallest positive integral i.e. third for meeting formula (5)
Value, the value of k3 is 0,1,2 ..., and N, N are the integer more than or equal to 0, | Δ N | for the absolute value of investment submodule difference.
(2) when the bridge arm current direction of bridge arm where each submodule is discharge current direction, the implementation of step S204
Journey is as follows:
When putting into submodule difference equal to zero, the 4th optimal cross-over value is generated according to second condition relational expression.
When it is implemented, setting the 4th optimal cross-over value as k4, by second condition when putting into submodule difference DELTA N=0
Relational expression (2) is converted to formula (6), generates the 4th optimal cross-over value k4 according to formula (6).
QMAXk4+1-TMINk4+1< Δ U (6)
Wherein, QMAXk1+1For excision group Neutron module voltage sort from small to large in (k4+1) a maximum submodule
Block voltage, TMINk1+1For investment group Neutron module voltage sort from large to small in (k4+1) a the smallest submodule voltage,
Δ U is preset submodule voltage fluctuation threshold value, and k4 is smallest positive integral i.e. the 4th optimal cross-over value for meeting formula (6), k4's
Value is 0,1,2 ..., and N, N are the integer more than or equal to 0.
It is raw according to second condition relational expression and the absolute value for putting into submodule difference when putting into submodule difference less than zero
At the 5th optimal cross-over value.
When it is implemented, setting the 5th optimal cross-over value when putting into submodule difference DELTA N < 0 as k5, submodule will be put into
The absolute value of block difference | Δ N | it is corresponding | Δ N | a corresponding submodule of enrolled minimum submodule voltage of throwing is preset as cutting off
Second condition relational expression (1) is then converted to formula (7) by discharge condition, generates the 5th optimal cross-over value k5 according to formula (7).
QMAXk5+1-TMINk5+|ΔN|+1< Δ U (7)
Wherein, QMAXk5+1For excision group Neutron module voltage sort from small to large in (k5+1) a maximum submodule
Block voltage, TMINk5+|ΔN|+1For investment group Neutron module voltage sort from large to small in a the smallest son of (k5+ | Δ N |+1)
Module voltage, Δ U are preset submodule voltage fluctuation threshold value, and k5 is smallest positive integral i.e. the 5th optimal friendship for meeting formula (7)
Value is changed, the value of k5 is 0,1,2 ..., and N, N are the integer more than or equal to 0, | Δ N | for the absolute value of investment submodule difference.
It is raw according to second condition relational expression and the absolute value for putting into submodule difference when putting into submodule difference greater than zero
At the 6th optimal cross-over value.
When it is implemented, setting the 6th optimal cross-over value when putting into submodule difference DELTA N >=0 as k6, submodule will be put into
The absolute value of block difference | Δ N | corresponding | Δ N | the corresponding submodule of maximal submodule voltage of a excision group is preset as putting into
Second condition relational expression (2) is then converted to formula (8) by discharge condition, generates the 6th optimal cross-over value k6 according to formula (8).
QMAXk6+|ΔN|+1-TMINk6+1< Δ U (8)
Wherein, QMAXk6+|ΔN|+1For excision group Neutron module voltage sort from small to large in (k6+ | Δ N |+1) it is a most
Big submodule voltage, TMINk6+1For investment group Neutron module voltage sort from large to small in (k6+1) a the smallest son
Module voltage, Δ U are preset submodule voltage fluctuation threshold value, and k6 is smallest positive integral i.e. the 6th optimal friendship for meeting formula (8)
Value is changed, the value of k6 is 0,1,2 ..., and N, N are the integer more than or equal to 0, | Δ N | for the absolute value of investment submodule difference.
S205: the submodule bulk state of enrolled submodule bulk state and excision group is thrown according to the adjustment of optimal cross-over value.
Step S205 is specially following either step:
(1) the corresponding submodule excision of the enrolled maximal submodule voltage of the throwing for the first optimal cross-over value being corresponded into number
Charged state, and the corresponding submodule investment of minimum submodule voltage that the first optimal cross-over value corresponds to the excision group of number is filled
Electricity condition.
It is when it is implemented, according to the first optimal cross-over value k1, the corresponding k1 throwing of the first optimal cross-over value k1 is enrolled
The corresponding submodule of maximal submodule voltage cuts off charged state, and by the corresponding k1 excision group of the first optimal cross-over value k1
The corresponding submodule of minimum submodule voltage puts into charged state.
(2) throwing that will put into the corresponding number of the sum of absolute value and the second optimal cross-over value of submodule difference is enrolled most
The corresponding submodule of big submodule voltage cuts off charged state, and the second optimal cross-over value is corresponded to the minimum of the excision group of number
The corresponding submodule of submodule voltage puts into charged state.
When it is implemented, the absolute value of submodule difference will be put into according to the second optimal cross-over value k2 | Δ N | most with second
The sum of excellent cross-over value k2 corresponding (k2+ | Δ N |) is a to throw the corresponding submodule excision charging shape of enrolled maximal submodule voltage
State, and by the corresponding submodule investment charging shape of the minimum submodule voltage of the corresponding k2 excision group of the second optimal cross-over value k2
State.
(3) the corresponding submodule excision of the enrolled maximal submodule voltage of the throwing for the optimal cross-over value of third being corresponded into number
Charged state, and the minimum of the excision group of the corresponding number of the sum of absolute value and optimal cross-over value of third that submodule difference will be put into
The corresponding submodule of submodule voltage puts into charged state.
When it is implemented, according to the optimal cross-over value k3 of third, the corresponding k3 throwing of the optimal cross-over value k3 of third is enrolled
The corresponding submodule of maximal submodule voltage cuts off charged state, and the absolute value that will put into submodule difference | Δ N | with third
The corresponding submodule investment charging of the minimum submodule voltage of the sum of optimal cross-over value k3 corresponding (k3+ | Δ N |) a excision group
State.
(4) the 4th optimal cross-over value is corresponded to the corresponding submodule investment of maximal submodule voltage of the excision group of number
Discharge condition, and the corresponding submodule excision of the enrolled minimum submodule voltage of throwing that the 4th optimal cross-over value corresponds to number is put
Electricity condition.
When it is implemented, according to the 4th optimal cross-over value k4, by the corresponding k4 excision group of the 4th optimal cross-over value k4
The corresponding submodule of maximal submodule voltage puts into discharge condition, and the corresponding k4 throwing of the 4th optimal cross-over value k4 is enrolled
The corresponding submodule of minimum submodule voltage cuts off discharge condition.
(5) the 5th optimal cross-over value is corresponded to the corresponding submodule investment of maximal submodule voltage of the excision group of number
Discharge condition, and the enrolled minimum of throwing of the corresponding number of the sum of absolute value and the 5th optimal cross-over value that submodule difference will be put into
The corresponding submodule of submodule voltage cuts off discharge condition.
When it is implemented, according to the 5th optimal cross-over value k5, by the corresponding k5 excision group of the 5th optimal cross-over value k5
The corresponding submodule of maximal submodule voltage puts into discharge condition, and will put into submodule absolute difference | Δ N | most with the 5th
The sum of excellent cross-over value k5 (k5+ | Δ N |) corresponding (k5+ | Δ N |) is a to throw the corresponding submodule of enrolled minimum submodule voltage
Cut off discharge condition.
(6) the excision group of the corresponding number of the sum of absolute value and the 6th optimal cross-over value of submodule difference will be put into most
The corresponding submodule of submodule voltage greatly puts into discharge condition, and the 6th optimal cross-over value is corresponded to the enrolled minimum of throwing of number
The corresponding submodule of submodule voltage cuts off discharge condition.
When it is implemented, the absolute value of submodule difference will be put into according to the 6th optimal cross-over value k6 | Δ N | most with the 6th
The corresponding submodule investment electric discharge shape of the maximal submodule voltage of the sum of excellent cross-over value k6 corresponding (k6+ | Δ N |) a excision group
State, and the 6th corresponding k6 of optimal cross-over value k6 is thrown into the corresponding submodule excision electric discharge shape of enrolled minimum submodule voltage
State.
Technical solution in the present embodiment has the IGBT average frequency of switching of optimization MMC valve group, reduces the loss of MMC valve group
And the beneficial effect suitable for practical engineering project.
In order to clearly illustrate above-described embodiment, above-described embodiment is illustrated below with reference to specific implementation process:
Fig. 6 is the flow chart of the IGBT control method based on MMC-HVDC in the present embodiment.
As shown in Figure 1, by taking bridge arm AP as an example, it is assumed that bridge arm AU shares 20 submodules i.e. n=20, bridge arm current Iarm。
Assuming that no module failure, that is to say, that in 20 modules, the working condition of 12 submodules is investment state, 8 submodules
Working condition be excision state.12 submodules of the state that puts into are arranged according to the sequence of submodule voltage from high to low
Column, and it is divided into investment group；By 8 submodules of the state that cuts off according to submodule voltage by being arranged as low as low sequence,
And it is divided into excision group.
Specific investment group T={ SM1, SM2, SM3, SM4, SM5, SM6, SM7, SM8, SM9, SM10, SM11, SM12, investment group
Submodule number be 12, set the corresponding submodule voltage of each submodule as VSM1=12V, VSM2=11V, VSM3=10V, VSM4
=9V, VSM5=8V, VSM6=7V, VSM7=6V, VSM8=5V, VSM9=4V, VSM10=3V, VSM11=2V, VSM12=1V, each submodule
The descending sequence of block voltage is as follows:
Excision group Q={ SM13, SM14, SM15, SM16, SM17, SM18, SM19, SM20, wherein it is corresponding to set each submodule
Submodule voltage is VSM13=1V, VSM14=, 3V, VSM15=5V, VSM16=7V, VSM17=9V, VSM18=11V, VSM19=13V,
VSM20=15V, the ascending sequence of each submodule voltage are as follows:
VSM13≤VSM14≤VSM15≤VSM16≤VSM17≤VSM18≤VSM19≤VSM20
Assuming that according to MMC-HVDC modulation technique calculate this operation in put into advance number of modules be 14, then put into submodule
Submodule number=14-12=2 in the expected investment submodule number-investment group of difference DELTA N=.
As shown in fig. 6, whether the bridge arm current direction for judging bridge arm AU is charging current direction, corresponding condition is selected to close
It is formula.According to Fig. 1 it is found that the bridge arm current direction I of bridge arm AUarmFor charging current direction, therefore first condition is selected to close
It is formula.
As shown in fig. 6, the absolute value of submodule difference will be put into due to putting into submodule difference DELTA N=2 > 0 | Δ N | it is right
The corresponding submodule of minimum submodule voltage for the 2 excision groups answered is preset as investment charged state, and is generated according to formula (5)
The optimal cross-over value k3 of third, wherein the ascending sequence of excision group Q submodule voltage is as follows:
VSM13≤VSM14≤VSM15≤VSM16≤VSM17≤VSM18≤VSM19≤VSM20, in the submodule voltage of excision group by
It is small sequentially to choose 2 minimum submodule voltage, that is, V to bigSM13And VSM14, it is contemplated that by VSM13Corresponding submodule SM13And VSM14It is right
The submodule SM answered14Charged state is put into, and the optimal cross-over value k3 of third is generated according to first condition relational expression.
In the present embodiment, preset submodule voltage fluctuation threshold value Δ U=3, formula (5) are converted to shown in formula (9):
Wherein TMAXk3+1For investment group Neutron module voltage sort from large to small in (k3+1) a maximum submodule
Voltage, QMINk3+2+1For excision group Neutron module voltage sort from small to large in (k3+2+1) a the smallest submodule electricity
Pressure, Δ U are preset submodule voltage fluctuation threshold value, and k3 is the optimal exchange of smallest positive integral i.e. third that minimum meets formula (9)
Value, the value of k3 are 0,1,2 ..., and N puts into the absolute value of submodule difference in the present embodiment | Δ N |=2.
The value of k3 is successively brought into formula (9) according to sequence from small to large, the smallest integer value of coincidence formula (9) is
For the optimal cross-over value k3 of third, specific calculating process is as follows:
As k3=0, each parameter is substituted into formula (9) and obtains following formula (10):
According to formula (10) TMAX1-QMIN2+1=7 >=3, it is unsatisfactory for the conditional relationship formula of formula (9).
As k3=1, each parameter is substituted into formula (9) and obtains following formula (11):
According to formula (11) TMAX2-QMIN2+2=4 >=3, it is unsatisfactory for the conditional relationship formula of formula (9).
As k3=2, each parameter is substituted into formula (9) and obtains following formula (12):
According to formula (12) TMAX3-QMIN5=1 < 3 meets the conditional relationship formula of formula (9), therefore third is optimal
Cross-over value k3=2.
As shown in fig. 6, according to the submodule number of the optimal cross-over value adjustment investment group T of third and the submodule of excision group Q
Number.
Specific adjustment process is as follows:
Maximal submodule voltage VSM1 and VSM2=in the corresponding 2 investment groups T of the optimal cross-over value k3 of third is corresponding
Submodule SM1 and SM2 cut off charged state.And the absolute value that submodule difference will be put into | Δ N | with the optimal cross-over value of third
Minimum submodule voltage VSM13, VSM14VSM15 and VSM16 of the corresponding 4 excision groups Q of the sum of k3 (i.e. 2+2=4) is corresponding
Submodule SM13, SM14, SM15 and SM16 put into charged state.
Submodule according to the investment of Modularized multi-level converter sub-module and excision state, is divided into throwing first by the application
Enter group and excision group and sorted respectively according to submodule voltage swing, then by the judgement to bridge arm current direction, determines electricity
The charge or discharge state of appearance selects corresponding conditional relationship formula, and MMC-HVDC modulation technique is recycled to calculate expected investment
Difference DELTA N between submodule number in number of modules and investment group, according to alternative condition relational expression and investment submodule number difference
Δ N calculates the optimal friendship for meeting the investment group and excision group of bridge arm Neutron module voltage fluctuation threshold value Δ U (i.e. equalizing effect)
Value is changed, the trigger pulse of each submodule of investment group and excision group is finally adjusted according to optimal cross-over value, is had and is pressed, optimizes
The IGBT average frequency of switching of MMC valve group, the service life for improving IGBT, the loss for reducing MMC valve group and raising engineering are reliable
The beneficial effect of property.
In order to clearly illustrate the embodiment of the present invention, it is illustrated below with reference to another specific embodiment.With a MMC system
For system, it is assumed that t1 moment bridge arm current direction is positive, that is, the submodule put into is in charged state, if putting into submodule number in advance
It needs to put into than currently and puts into a submodule more submodule number, then a submodule the smallest in excision group is put into advance and filled
Electricity makes its voltage rapid increase.The submodule voltage difference of investment group Yu excision group is judged at the same time, if throwing enrolled submodule
Ceiling voltage and the small submodule difference in voltage of excision group second are greater than Δ U, and the submodule electricity that investment group submodule second is high
Pressure is less than Δ U, as shown in formula (5), the then smallest positive integral of optimal cross-over value with the small submodule difference in voltage of excision group third
Value is 1, i.e., only the corresponding submodule excision of investment group highest submodule voltage need to be at self discharge state, voltage is slow
Slow decline, the small submodule voltage of excision group second (submodule one of investment charging in advance+according to optimal cross-over value need by
The investment charging of 1 submodule amounts to two minimum submodule voltages) corresponding submodule investment charging, voltage rapid increase,
And so on.Assuming that t2 moment bridge arm current direction is negative, that is, the submodule put into is in discharge condition, if putting into submodule in advance
Number needs than currently putting into that submodule number is few puts into a submodule, then considers first that investment group Neutron module voltage is the smallest by one
A submodule is cut off in advance, is at self discharge state, and voltage slowly declines.Judge that excision group and throwing are enrolled at the same time
Submodule voltage difference if the difference of the highest submodule voltage of excision group and investment group the second boy module voltage is greater than Δ U, and is cut
It is as shown in formula (8), then optimal except the difference of the second high submodule voltage of group and investment group third boy's module voltage is less than Δ U
The smallest positive integral value of cross-over value is 1, i.e., only need to be by the corresponding submodule investment of excision group highest submodule voltage to reach fast
Fast discharge condition, (submodule cuts off in advance+is needed according to optimal cross-over value by 1 the small submodule voltage of investment group second
The excision of a submodule amounts to two minimum submodule voltages) corresponding submodule excision enters slow discharge condition, with such
It pushes away.By above method, achievees the effect that follow modulating wave and press.
Conceived based on application identical with the above-mentioned IGBT control method based on MMC-HVDC, the application provides a kind of calculating
Machine equipment, as described in following example.Since the principle that the computer equipment solves the problems, such as is controlled with the IGBT based on MMC-HVDC
Method processed is similar, therefore the implementation of the computer equipment may refer to the implementation of the IGBT control method based on MMC-HVDC, weight
Multiple place repeats no more.
In one embodiment, computer equipment includes: memory, processor and storage on a memory and can handle
The computer program run on device, as shown in figure 4, the processor performs the steps of when executing the computer program
S101: according to the current working status of each submodule on the same bridge arm of acquisition, each submodule is divided into throwing
Enter group and excision group.Wherein, each submodule of enrolled each submodule and excision group is thrown respectively according to the size of submodule voltage
It is ranked up.
S102: it is poor that expected investment submodule number and the submodule number in investment group that will acquire make the difference generation investment submodule
Value.
S103: according to the bridge arm current direction selection conditional relationship formula of bridge arm where each submodule.
S104: optimal cross-over value is generated according to investment submodule difference and conditional relationship formula.
S105: the submodule bulk state of enrolled submodule bulk state and excision group is thrown according to the adjustment of optimal cross-over value.
Conceived based on application identical with the above-mentioned IGBT control method based on MMC-HVDC, the application provides a kind of calculating
Machine readable storage medium storing program for executing, as described in following example.The principle solved the problems, such as due to the computer readable storage medium be based on
The IGBT control method of MMC-HVDC is similar, therefore the implementation of the computer readable storage medium may refer to based on MMC-HVDC
IGBT control method implementation, overlaps will not be repeated.
In one embodiment, it is stored with computer program on computer readable storage medium, as shown in figure 4, the calculating
Machine program performs the steps of when being executed by processor
S101: according to the current working status of each submodule on the same bridge arm of acquisition, each submodule is divided into throwing
Enter group and excision group.Wherein, each submodule of enrolled each submodule and excision group is thrown respectively according to the size of submodule voltage
It is ranked up.
S102: it is poor that expected investment submodule number and the submodule number in investment group that will acquire make the difference generation investment submodule
Value.
S103: according to the bridge arm current direction selection conditional relationship formula of bridge arm where each submodule.
S104: optimal cross-over value is generated according to investment submodule difference and conditional relationship formula.
S105: the submodule bulk state of enrolled submodule bulk state and excision group is thrown according to the adjustment of optimal cross-over value.
A kind of IGBT control method based on MMC-HVDC provided by the invention, comprising: according on the same bridge arm of acquisition
Each submodule current working status, each submodule is divided into investment group and excision group；Wherein, enrolled each submodule is thrown
And each submodule of excision group is ranked up according to the size of submodule voltage respectively；The expected investment submodule number that will acquire with
Submodule number in investment group makes the difference generation investment submodule difference；According to the bridge arm current direction choosing of bridge arm where each submodule
Select conditional relationship formula；Optimal cross-over value is generated according to investment submodule difference and conditional relationship formula；It is adjusted according to optimal cross-over value
Throw the submodule bulk state of enrolled submodule bulk state and excision group.The application is by dividing submodule according to investment/excision state
Group sequence is then based on investment/submodule voltage difference, bridge arm current direction and the equalizing effect generation of excision group are put into/and cuts
Except the method for the corresponding optimal cross-over value of group, have adjust bridge arm submodule capacitor voltage fluctuation amplitude (i.e. equalizing effect),
The IGBT average frequency of switching for optimizing MMC valve group, the service life for improving IGBT, the loss for reducing MMC valve group and raising engineering
The beneficial effect of reliability.
It should be understood by those skilled in the art that, the embodiment of the present invention can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the present invention
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the present invention, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
Specific embodiment is applied in the present invention, and principle and implementation of the present invention are described, above embodiments
Explanation be merely used to help understand method and its core concept of the invention；At the same time, for those skilled in the art,
According to the thought of the present invention, there will be changes in the specific implementation manner and application range, in conclusion in this specification
Appearance should not be construed as limiting the invention.
Claims (9)
1. a kind of IGBT control method based on MMC-HVDC characterized by comprising
According to the current working status of each submodule on the same bridge arm of acquisition, by each submodule be divided into investment group and
Excision group；Each submodule for throwing enrolled each submodule and the excision group is respectively according to the size progress of submodule voltage
Sequence；
Submodule number in the expected investment submodule number that will acquire and the investment group makes the difference generation investment submodule difference；
According to the bridge arm current direction selection conditional relationship formula of bridge arm where each submodule；
Optimal cross-over value is generated according to the investment submodule difference and the conditional relationship formula；
The submodule bulk state of the enrolled submodule bulk state of the throwing and the excision group is adjusted according to the optimal cross-over value.
2. the IGBT control method according to claim 1 based on MMC-HVDC, which is characterized in that the conditional relationship formula
It include: first condition relational expression and second condition relational expression；Wherein,
The first condition relationship are as follows: judge that the submodule voltage for throwing enrolled current sequence number is corresponding with the excision group
Whether the difference of the submodule voltage of serial number is less than preset submodule voltage fluctuation threshold value；
The second condition relationship are as follows: judge that the submodule voltage of the current sequence number of the excision group and the throwing are enrolled corresponding
Whether the difference of the submodule voltage of serial number is less than preset submodule voltage fluctuation threshold value.
3. the IGBT control method according to claim 2 based on MMC-HVDC, which is characterized in that described according to each described
The bridge arm current direction selection conditional relationship formula of bridge arm where submodule, comprising:
When the bridge arm current direction of bridge arm is charging current direction where each submodule, the first condition relationship is selected
Formula；
When the bridge arm current direction of bridge arm is discharge current direction where each submodule, the second condition relationship is selected
Formula.
4. the IGBT control method according to claim 3 based on MMC-HVDC, which is characterized in that described according to the throwing
Enter submodule difference and the conditional relationship formula generate optimal cross-over value, comprising:
When the investment submodule difference is equal to zero, optimal cross-over value is generated according to the first condition relational expression；
When the investment submodule difference is not equal to zero, according to the first condition relational expression and the investment submodule difference
Generate optimal cross-over value.
5. the IGBT control method according to claim 1 or 4 based on MMC-HVDC, which is characterized in that described according to institute
State the submodule bulk state that optimal cross-over value adjusts the enrolled submodule bulk state of the throwing and the excision group, comprising:
The corresponding submodule excision charging of the enrolled maximal submodule voltage of the throwing that the optimal cross-over value is corresponded into number
State, and the corresponding submodule investment of minimum submodule voltage that the optimal cross-over value corresponds to the excision group of number is filled
Electricity condition；Or
The throwing of the corresponding number of the sum of absolute value and the optimal cross-over value by the investment submodule difference is enrolled most
The corresponding submodule of submodule voltage greatly cuts off charged state, and the optimal cross-over value is corresponded to the excision group of number
The corresponding submodule of minimum submodule voltage puts into charged state；Or
The corresponding submodule excision charging of the enrolled maximal submodule voltage of the throwing that the optimal cross-over value is corresponded into number
State, and by the excision group of the corresponding number of the sum of absolute value and the optimal cross-over value of the investment submodule difference
The corresponding submodule of minimum submodule voltage puts into charged state.
6. the IGBT control method according to claim 3 based on MMC-HVDC, which is characterized in that described according to the throwing
Enter submodule difference and the conditional relationship formula generate optimal cross-over value, comprising:
When the investment submodule difference is equal to zero, optimal cross-over value is generated according to the second condition relational expression；
When the investment submodule difference is not equal to zero, according to the second condition relational expression and the investment submodule difference
Generate optimal cross-over value.
7. the IGBT control method according to claim 1 or 6 based on MMC-HVDC, which is characterized in that described according to institute
State the submodule bulk state that optimal cross-over value adjusts the enrolled submodule bulk state of the throwing and the excision group, comprising:
The corresponding submodule investment electric discharge of the maximal submodule voltage that the optimal cross-over value is corresponded into the excision group of number
State, and the corresponding submodule excision of the enrolled minimum submodule voltage of the throwing that the optimal cross-over value corresponds to number is put
Electricity condition；Or
The corresponding submodule investment electric discharge of the maximal submodule voltage that the optimal cross-over value is corresponded into the excision group of number
State, and the throwing of the corresponding number of the sum of absolute value and the optimal cross-over value of the investment submodule difference is enrolled
The corresponding submodule of minimum submodule voltage cuts off discharge condition；Or
The excision group of the corresponding number of the sum of absolute value and the optimal cross-over value by the investment submodule difference is most
The corresponding submodule of submodule voltage greatly puts into discharge condition, and the throwing that the optimal cross-over value is corresponded to number is enrolled
The corresponding submodule of minimum submodule voltage cuts off discharge condition.
8. the IGBT control method according to claim 2 or 3 based on MMC-HVDC, which is characterized in that described first
Part relational expression specifically:
TMAXk+1-QMINk+1< Δ U,
Wherein, TMAXk+1(k+1) a maximum submodule voltage, QMIN in the investment groupk+1It is in the excision group
(k+1) a the smallest submodule voltage, Δ U are the preset submodule voltage fluctuation threshold value, and k is the optimal cross-over value, k
Value be 0,1,2 ... ..., N, N are integer more than or equal to 0.
9. the IGBT control method according to claim 2 or 3 based on MMC-HVDC, which is characterized in that the Article 2
Part relational expression specifically:
QMAXk+1-TMINk+1< Δ U,
Wherein, QMAXk+1(k+1) a maximum submodule voltage, TMIN in the excision groupk+1It is in the investment group
(k+1) a the smallest submodule voltage, Δ U are the preset submodule voltage fluctuation threshold value, and k is the optimal cross-over value, k
Value be 0,1,2 ... ..., N, N are integer more than or equal to 0.
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| CN110474551A (en) * | 2019-08-28 | 2019-11-19 | 南京南瑞继保电气有限公司 | Control method is moved back in a kind of submodule throwing of modularization multi-level converter |
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