CN103199729B - A kind of modular multi-level converter submodule grouping Staircase wave method - Google Patents

A kind of modular multi-level converter submodule grouping Staircase wave method Download PDF

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Publication number
CN103199729B
CN103199729B CN201310122375.0A CN201310122375A CN103199729B CN 103199729 B CN103199729 B CN 103199729B CN 201310122375 A CN201310122375 A CN 201310122375A CN 103199729 B CN103199729 B CN 103199729B
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submodule
voltage
group
dropped
submodule group
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CN103199729A (en
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郭高朋
温家良
杨杰
药韬
尤夏
吴婧
王宇
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State Grid Corp of China SGCC
Smart Grid Research Institute of SGCC
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State Grid Corp of China SGCC
Smart Grid Research Institute of SGCC
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Priority to PCT/CN2013/087801 priority patent/WO2014166261A1/en
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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
    • 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)
  • Inverter Devices (AREA)

Abstract

The invention provides a kind of modular multi-level converter submodule grouping Staircase wave method, comprise the following steps: the submodule in change of current chain is divided into N number of submodule group; The reference voltage of submodule group is rounded, obtains the reference staircase voltage V after rounding stair_wave; Distribute trigger impulse to the submodule of submodule group inside; All press between submodule group.In the present invention, submodule is divided into N number of submodule group, each submodule group is considered as a controllable voltage source, Staircase wave is adopted in submodule group, N number of submodule group adopts and rounds correction, can reach the object being similar to phase-shifting carrier wave, adopt appropriate Pressure and Control mode to carry out voltage stabilizing control between submodule group, simplify the complexity of Staircase wave, greatly reduce modulation algorithm and Pressure and Control algorithm to the requirement of software and hardware.

Description

A kind of modular multi-level converter submodule grouping Staircase wave method
Technical field
The invention belongs to electric and electronic technical field, be specifically related to a kind of modular multi-level converter submodule grouping Staircase wave method.
Background technology
Traditional DC transmission system based on thyristor adopts the mode of phase control rectifier, three-phase alternating current is become the direct current of six pulsation or 12 pulsation, but this DC transmission system needs to absorb a large amount of reactive powers, especially under AC failure condition.DC transmission system (VSC-HVDC) based on voltage source converter is equivalent to a controllable voltage source, can four quadrant running, realizes the independent regulation of AC active reactive, and this is significant to formation direct current network.Because modular multi-level converter adopts modularized design, comprise a bulky capacitor in each submodule and clamper is carried out to voltage, its electric pressure and capacity can be expanded by the series connection of submodule, and therefore this current transformer is a kind of rising current transformer.But when this current transformer is applied to the occasion of high-voltage large-capacity, need the submodule number of series connection very many, this makes the distribution of trigger impulse become difficulty, the realization of electrical secondary system also becomes difficulty, or even infeasible, therefore, when modular multi-level converter is applied to the occasion of high-voltage large-capacity, be necessary to rethink that carrying out grouping to numerous submodules controls, to reduce the difficulty that trigger impulse distributes, also make electrical secondary system be more prone to realize.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the invention provides a kind of modular multi-level converter submodule grouping Staircase wave method, submodule is divided into N number of submodule group, each submodule group is considered as a controllable voltage source, Staircase wave is adopted in submodule group, N number of submodule group adopts and rounds correction, the object being similar to phase-shifting carrier wave can be reached, appropriate Pressure and Control mode is adopted to carry out voltage stabilizing control between submodule group, simplify the complexity of Staircase wave, greatly reduce modulation algorithm and Pressure and Control algorithm to the requirement of software and hardware.
In order to realize foregoing invention object, the present invention takes following technical scheme:
A kind of modular multi-level converter submodule grouping Staircase wave method is provided, said method comprising the steps of:
Step 1: the submodule in change of current chain is divided into N number of submodule group;
Step 2: rounded by the reference voltage of submodule group, obtains the reference staircase voltage V after rounding stair_wave;
Step 3: distribute trigger impulse to the submodule of submodule group inside;
Step 4: all press between submodule group.
In described step 1, submodule group is controllable voltage source, and the control signal of controllable voltage source is the reference voltage V of submodule group ref.
In described step 2, the reference staircase voltage V after rounding stair_wavebe expressed as
V stair _ wave = floor ( V ref V sm + δ k ) - - - ( 1 )
Wherein, V refthe reference voltage of submodule group, V smbe the average voltage of submodule group, floor function is the bracket function of negative infinity, δ kbe submodule group round correction, δ k=(2k-1)/2N+m k, wherein k=1,2 ... N; m kfor integer, and submodule group round correction δ kmean value be 0.5, that is:
Described step 3 comprises the following steps:
Step 3-1: judge that the direction of bridge arm current is positive direction or negative direction;
Step 3-2: the direction according to bridge arm current is dropped into or excision submodule F.F. row.
Step 3-3: judge that whether the submodule number dropped into is consistent with the submodule number needing to drop into, if inconsistent, then the submodule of the submodule difference number that the submodule needing excision or input to drop into and needs drop into, makes the two again consistent.
In described step 3-2, if the direction of bridge arm current is positive direction, then the electric capacity of bridge arm current to the submodule dropped into charges, and drops into or excision process is to submodule:
A) if need submodule be dropped into, then find out and do not drop into the lower submodule of voltage in submodule, dropped into;
B) if need submodule be excised, then find out and do not drop into the higher submodule of voltage in submodule, excised.
In the process that the electric capacity of bridge arm current to the submodule dropped into charges, if the submodule that in the submodule dropped into, capacitance voltage is higher is than the voltage height u not dropping into the lower submodule of capacitance voltage in submodule, then submodule higher for capacitance voltage in the submodule dropped into is excised, the lower submodule of capacitance voltage in submodule will do not dropped into simultaneously and drop into.
In described step 3-2, if the direction of bridge arm current is negative direction, then the electric capacity of bridge arm current to the submodule dropped into discharges, and drops into or excision process is to submodule:
A) if need submodule be dropped into, then find out and do not drop into the higher submodule of voltage in submodule, dropped into;
B) if need submodule be excised, then find out and do not drop into the lower submodule of voltage in submodule, excised.
In the process that the electric capacity of bridge arm current to the submodule dropped into discharges, if the submodule that in the submodule dropped into, voltage is lower u lower than the capacitance voltage not dropping into the higher submodule of voltage in submodule, then submodule lower for capacitance voltage in the submodule dropped into is excised, the higher submodule of capacitance voltage in submodule will do not dropped into simultaneously and drop into.
In described step 4, all press according to following Pressure and Control mode between submodule group:
Mode 1:N submodule group round correction δ krecycle between N number of submodule group, the voltage of the submodule group caused with the difference eliminated owing to rounding correction is unbalanced;
Mode 2: to the average voltage V of submodule group smsort, when modular multi-level converter is operated in inverter mode, submodule group rounded correction δ kbe assigned to voltage submodule group from small to large from big to small successively, the submodule group making capacitor averaging voltage low charging is more; When modular multi-level converter is operated in rectification state, submodule group rounded correction δ kbe assigned to voltage submodule group from big to small from big to small successively, the submodule group electric discharge that capacitor averaging voltage is high is more;
Mode 3: according to the average voltage V of submodule group smwith the difference of change of current chain average voltage, DC component or alternating current component is superposed in the voltage modulated ripple of submodule group, the submodule group higher to average voltage is discharged, and the submodule group lower to average voltage is charged, to make submodule group electric voltage equalization.
Compared with prior art, beneficial effect of the present invention is:
1, submodule group is considered as independently controllable voltage source, submodule group inside adopts Staircase wave, and the coupling between submodule group reduces greatly, therefore greatly reduces modulation algorithm and control algolithm to the requirement of software and hardware;
2, adopt between submodule group and different round correction, the object being similar to phase-shifting carrier wave can be reached, the harmonic wave of submodule group is cancelled out each other, thus make voltage waveform that change of current chain exports closer to sine wave;
3, adopt appropriate Pressure and Control mode between submodule, the voltage between submodule group can be made to keep in balance, thus can ensure that current transformer can normally run.
Accompanying drawing explanation
Fig. 1 is modular multi-level converter submodule grouping Staircase wave Method And Principle figure;
Fig. 2 is modular multilevel converter structure figure in modular multi-level converter submodule grouping Staircase wave method.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
A kind of modular multi-level converter submodule grouping Staircase wave method is provided, said method comprising the steps of:
Step 1: the submodule in change of current chain is divided into N number of submodule group;
Step 2: rounded by the reference voltage of submodule group, obtains the reference staircase voltage V after rounding stair_wave;
Step 3: distribute trigger impulse to the submodule of submodule group inside;
Step 4: all press between submodule group.
In described step 1, submodule group is controllable voltage source, and the control signal of controllable voltage source is the reference voltage V of submodule group ref.
In described step 2, the reference staircase voltage after rounding vstair_wavebe expressed as
V stair _ wave = floor ( V ref V sm + δ k ) - - - ( 1 )
Wherein, V refthe reference voltage of submodule group, V smbe the average voltage of submodule group, floor function is the bracket function of negative infinity, δ kbe submodule group round correction, δ k=(2k-1)/2N+m k, wherein k=1,2 ... N; m kfor integer, and submodule group round correction δ kmean value be 0.5, that is:
Described step 3 comprises the following steps:
Step 3-1: judge that the direction of bridge arm current is positive direction or negative direction;
Step 3-2: the direction according to bridge arm current is dropped into or excision submodule F.F. row.
Step 3-3: judge that whether the submodule number dropped into is consistent with the submodule number needing to drop into, if inconsistent, then the submodule of the submodule difference number that the submodule needing excision or input to drop into and needs drop into, makes the two again consistent.
In described step 3-2, if the direction of bridge arm current is positive direction, then the electric capacity of bridge arm current to the submodule dropped into charges, and drops into or excision process is to submodule:
A) if need submodule be dropped into, then find out and do not drop into the lower submodule of voltage in submodule, dropped into;
B) if need submodule be excised, then find out and do not drop into the higher submodule of voltage in submodule, excised.
In the process that the electric capacity of bridge arm current to the submodule dropped into charges, if the submodule that in the submodule dropped into, capacitance voltage is higher is than the voltage height u not dropping into the lower submodule of capacitance voltage in submodule, then submodule higher for capacitance voltage in the submodule dropped into is excised, the low submodule of capacitance voltage in submodule will do not dropped into simultaneously and drop into.
In described step 3-2, if the direction of bridge arm current is negative direction, then the electric capacity of bridge arm current to the submodule dropped into discharges, and drops into or excision process is to submodule:
A) if need submodule be dropped into, then find out and do not drop into the higher submodule of voltage in submodule, dropped into;
B) if need submodule be excised, then find out and do not drop into the lower submodule of voltage in submodule, excised.
In the process that the electric capacity of bridge arm current to the submodule dropped into discharges, if the submodule that in the submodule dropped into, voltage is lower u lower than the capacitance voltage not dropping into the higher submodule of voltage in submodule, then submodule lower for capacitance voltage in the submodule dropped into is excised, the higher submodule of capacitance voltage in submodule will do not dropped into simultaneously and drop into.
In described step 4, all press according to following Pressure and Control mode between submodule group:
Mode 1:N submodule group round correction δ krecycle between N number of submodule group, the voltage of the submodule group caused with the difference eliminated owing to rounding correction is unbalanced;
Mode 2: to the average voltage V of submodule group smsort, when modular multi-level converter is operated in inverter mode, submodule group rounded correction δ kbe assigned to voltage submodule group from small to large from big to small successively, the submodule group making capacitor averaging voltage low charging is more; When modular multi-level converter is operated in rectification state, submodule group rounded correction δ kbe assigned to voltage submodule group from big to small from big to small successively, the submodule group electric discharge that capacitor averaging voltage is high is more;
Mode 3: according to the average voltage V of submodule group smwith the difference of change of current chain average voltage, DC component or alternating current component is superposed in the voltage modulated ripple of submodule group, the submodule group higher to average voltage is discharged, and the submodule group lower to average voltage is charged, to make submodule group electric voltage equalization.
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, although with reference to above-described embodiment to invention has been detailed description, those of ordinary skill in the field are to be understood that: still can modify to the specific embodiment of the present invention or equivalent replacement, and not departing from any amendment of spirit and scope of the invention or equivalent replacement, it all should be encompassed in the middle of right of the present invention.

Claims (8)

1. a modular multi-level converter submodule grouping Staircase wave method, is characterized in that: said method comprising the steps of:
Step 1: the submodule in change of current chain is divided into N number of submodule group;
Step 2: rounded by the reference voltage of submodule group, obtains the reference staircase voltage V after rounding stair_wave;
Step 3: distribute trigger impulse to the submodule of submodule group inside;
Step 4: all press between submodule group;
In described step 2, the reference staircase voltage V after rounding stair_wavebe expressed as
V stair _ wave = floor ( V ref V sm + δ k ) - - - ( 1 )
Wherein, V refthe reference voltage of submodule group, V smbe the average voltage of submodule group, floor function is the bracket function of negative infinity, δ kbe submodule group round correction, δ k=(2k-1)/2N+m k, wherein k=1,2 ... N; m kfor integer, and submodule group round correction δ kmean value be 0.5, that is:
2. modular multi-level converter submodule grouping Staircase wave method according to claim 1, it is characterized in that: in described step 1, submodule group is controllable voltage source, and the control signal of controllable voltage source is the reference voltage V of submodule group ref.
3. modular multi-level converter submodule grouping Staircase wave method according to claim 1, is characterized in that: described step 3 comprises the following steps:
Step 3-1: judge that the direction of bridge arm current is positive direction or negative direction;
Step 3-2: the direction according to bridge arm current is dropped into or excision submodule F.F. row;
Step 3-3: judge that whether the submodule number dropped into is consistent with the submodule number needing to drop into, if inconsistent, then the submodule of the submodule difference number that the submodule needing excision or input to drop into and needs drop into, makes the two again consistent.
4. modular multi-level converter submodule grouping Staircase wave method according to claim 3, it is characterized in that: in described step 3-2, if the direction of bridge arm current is positive direction, then the electric capacity of bridge arm current to the submodule dropped into charges, and drops into or excision process is to submodule:
A) if need submodule be dropped into, then find out and do not drop into the lower submodule of voltage in submodule, dropped into;
B) if need submodule be excised, then find out and do not drop into the higher submodule of voltage in submodule, excised.
5. modular multi-level converter submodule grouping Staircase wave method according to claim 4, it is characterized in that: in the process that the electric capacity of bridge arm current to the submodule dropped into charges, if the submodule that in the submodule dropped into, capacitance voltage is higher is than the voltage height Δ u not dropping into the lower submodule of capacitance voltage in submodule, then submodule higher for capacitance voltage in the submodule dropped into is excised, the lower submodule of capacitance voltage in submodule will do not dropped into simultaneously and drop into.
6. modular multi-level converter submodule grouping Staircase wave method according to claim 3, it is characterized in that: in described step 3-2, if the direction of bridge arm current is negative direction, then the electric capacity of bridge arm current to the submodule dropped into discharges, and drops into or excision process is to submodule:
A) if need submodule be dropped into, then find out and do not drop into the higher submodule of voltage in submodule, dropped into;
B) if need submodule be excised, then find out and do not drop into the lower submodule of voltage in submodule, excised.
7. modular multi-level converter submodule grouping Staircase wave method according to claim 6, it is characterized in that: in the process that the electric capacity of bridge arm current to the submodule dropped into discharges, if the submodule that in the submodule dropped into, voltage is lower Δ u lower than the capacitance voltage not dropping into the higher submodule of voltage in submodule, then submodule lower for capacitance voltage in the submodule dropped into is excised, the higher submodule of capacitance voltage in submodule will do not dropped into simultaneously and drop into.
8. modular multi-level converter submodule grouping Staircase wave method according to claim 1, is characterized in that: in described step 4, all presses between submodule group according to following Pressure and Control mode:
Mode 1:N submodule group round correction δ krecycle between N number of submodule group, the voltage of the submodule group caused with the difference eliminated owing to rounding correction is unbalanced;
Mode 2: to the average voltage V of submodule group smsort, when modular multi-level converter is operated in inverter mode, submodule group rounded correction δ kbe assigned to voltage submodule group from small to large from big to small successively, the submodule group making capacitor averaging voltage low charging is more; When modular multi-level converter is operated in rectification state, submodule group rounded correction δ kbe assigned to voltage submodule group from big to small from big to small successively, the submodule group electric discharge that capacitor averaging voltage is high is more;
Mode 3: according to the average voltage V of submodule group smwith the difference of change of current chain average voltage, DC component or alternating current component is superposed in the voltage modulated ripple of submodule group, the submodule group higher to average voltage is discharged, and the submodule group lower to average voltage is charged, to make submodule group electric voltage equalization.
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PCT/CN2013/087801 WO2014166261A1 (en) 2013-04-10 2013-11-26 Modulation method for grouping stair waves of modularization multilevel converter submodules

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