CN107276442B - Modulator approach suitable for active neutral point clamp Five-level converter - Google Patents
Modulator approach suitable for active neutral point clamp Five-level converter Download PDFInfo
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- CN107276442B CN107276442B CN201710400923.XA CN201710400923A CN107276442B CN 107276442 B CN107276442 B CN 107276442B CN 201710400923 A CN201710400923 A CN 201710400923A CN 107276442 B CN107276442 B CN 107276442B
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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
- H02M7/487—Neutral point clamped inverters
-
- 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
- H02M7/53—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 using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/539—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency
- H02M7/5395—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency by pulse-width modulation
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- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a kind of modulator approaches suitable for active neutral point clamp Five-level converter, include the following steps, each mutually independent progress carrier wave comparison, determine output level, then according to different circuit states and according to the instruction of state machine, the circuit state of next needs and the driving signal of main switch are obtained.So that eight main switches close to DC bus work in power frequency, four main switches work close to striding capacitance reduces switching loss in carrier frequency for the invention；The switch stress of the intermediate state undergone in commutation course guarantees a quarter in busbar voltage hereinafter, achieving the purpose that protect main switch.Since the driving signal of each phase is individually control, therefore the present invention is applicable not only to single-phase ANPC circuit, and is suitable for the ANPC inverter circuit of three-phase three-wire system, three-phase four-wire system.
Description
Technical field
The present invention relates to a kind of safe and reliable low-loss modulation strategies, and in particular, to a kind of suitable for active
The modulator approach of point clamp five level (ANPC-5L) current transformer.
Background technique
Active five level of neutral point clamp (Active Neutral Point Clamped-Five Level) current transformer,
Circuit is as shown in Figure 1, it has the full control main switch (S of anti-paralleled diode by 121~S8) and a striding capacitance (Cf) structure
At.This single-phase Five-level converter can be realized function of generating electricity by way of merging two or more grid systems, can also with bringing onto load independent operating and driving motor, and
And the voltage stress of main switch is a quarter of busbar voltage in circuit.But there are more switching tubes in circuit
And capacitor, i.e., there are more open positions for circuit, and wherein most can cause capacitance short-circuit failure or main switch voltage
The problems such as increase of stress.Remain at circuit in commutation course under safe and reliable open position, is
In ANPC circuit studies and practical application the problem of urgent need to resolve.
Through retrieving, the Chinese patent application of Publication No. 104601026A, the invention provides a kind of changes of five level of ANPC
The flying capacitor voltage control method when SHEPWM modulation of device is flowed, according to the voltage value of flying capacitor voltage, with flying capacitor
The reference value of voltage is compared, and is determined that flying capacitor needs are charged or discharged, is detected the positive and negative of load current, then with true
Determine the Redundanter schalter state of ANPC converter.The invention solve the current transformer SHEPWM modulation in flying capacitor voltage fluctuation compared with
Big problem.
Currently without the explanation or report for finding technology similar to the present invention, it is also not yet collected into money similar both at home and abroad
Material.
Summary of the invention
In view of the above defects of the prior art, the object of the present invention is to provide one kind to be suitable for active neutral point clamp
The modulator approach of five level (ANPC-5L) current transformer.
To achieve the above object, the present invention is achieved by the following technical solutions.
A kind of modulator approach suitable for active neutral point clamp Five-level converter, comprising the following steps:
Step 1: each phase modulating wave independently carries out carrier wave comparison, determines output level；
Step 2: according to different circuit states and according to the instruction of state machine, the circuit state of next needs is obtained
With the driving signal of main switch.
Preferably, the step 1 specifically includes following sub-step:
Step S1, each phase modulating wave are compared with four carrier waves respectively, generate four logical relations (positive and negative), if adjusting
Wave height processed then generates 1 in carrier wave, if carrier wave is higher than modulating wave, generates 0；
Step S2 judges four logical relations, if four be 1, exports+2 level；If three is 1, another
It is 0, then exports+1 level；If the two is 1, both another is 0, then exports 0 level；If three is 0, another is 1, then exports -1 electricity
It is flat；If four be 0, -2 level are exported；
Step S3, the output level that step S2 is obtained is temporary, for corresponding with the circuit state of step 2.
Preferably, the step 2 specifically includes following sub-step:
Step s1, the output level obtained according to step 1 determine the circuit state of next needs；
Step s2 exports electric current and striding capacitance voltage condition according to actual circuit, further determines that next circuit shape
State, if capacitance voltage is lower than setting value (i.e. a quarter of busbar voltage), circuit state can use table 1, capacitor charging in table 2
State；If capacitance voltage is higher than setting value (i.e. a quarter of busbar voltage), circuit state can use that table 1, capacitor discharges in table 2
State；
Step s3, according to the instruction of state machine, as shown in Fig. 2, showing that circuit can sense circuit from the arrival of current circuit state
The nearest step of state, and successively implement；
Step s4, according to the relationship listed by table 1, table 2 between circuit state and the driving signal of main switch, by each electricity
Line state is converted to the driving signal of corresponding main switch, controls the turn-on and turn-off of main switch.
Preferably, as shown in Table 1 and Table 2, the circuit state includes: 16 kinds of switch states and 10 kinds of intermediate state；
Wherein:
16 kinds of switch states are respectively as follows:
- V8: switch S1, switch S3, switch S5, switch S7Closure, switch S2, switch S4, switch S6, switch S8The shape of disconnection
State；
- V7-1: switch S1, switch S4, switch S5, switch S7Closure, switch S2, switch S3, switch S6, switch S8It disconnects
State；
- V7-2: switch S1, switch S4, switch S7Closure, switch S2, switch S3, switch S5, switch S6, switch S8It disconnects
State；
- V7-3: switch S1, switch S3, switch S4, switch S7Closure, switch S2, switch S5, switch S6, switch S8It disconnects
State；
- V6: switch S2, switch S3, switch S5, switch S7Closure, switch S1, switch S4, switch S6, switch S8The shape of disconnection
State；
- V5-1: switch S2, switch S4, switch S5, switch S7Closure, switch S1, switch S3, switch S6, switch S8It disconnects
State；
- V5-2: switch S2, switch S4, switch S7Closure, switch S1, switch S3, switch S5, switch S6, switch S8It disconnects
State；
- V5-3: switch S2, switch S3, switch S4, switch S7Closure, switch S1, switch S5, switch S6, switch S8It disconnects
State；
- V4-1: switch S1, switch S3, switch S6, switch S8Closure, switch S2, switch S4, switch S5, switch S7It disconnects
State；
- V4-2: switch S1, switch S3, switch S6Closure, switch S2, switch S4, switch S5, switch S7, switch S8It disconnects
State；
- V4-3: switch S1, switch S3, switch S4, switch S6Closure, switch S2, switch S5, switch S7, switch S8It disconnects
State；
- V3: switch S1, switch S4, switch S6, switch S8Closure, switch S2, switch S3, switch S5, switch S7The shape of disconnection
State；
- V2-1: switch S2, switch S3, switch S6, switch S8Closure, switch S1, switch S4, switch S5, switch S7It disconnects
State；
- V2-2: switch S2, switch S3, switch S6Closure, switch S1, switch S4, switch S5, switch S7, switch S8It disconnects
State；
- V2-3: switch S2, switch S3, switch S4, switch S6Closure, switch S1, switch S5, switch S7, switch S8It disconnects
State；
- V1: switch S2, switch S4, switch S6, switch S8Closure, switch S1, switch S3, switch S5, switch S7The shape of disconnection
State；
10 kinds of intermediate state are respectively as follows:
-VM0: switch S1, switch S3, switch S4Closure, switch S2, switch S5, switch S7, switch S6, switch S8The shape of disconnection
State；
-VM1: switch S3, switch S5, switch S7Closure, switch S1, switch S2, switch S4, switch S6, switch S8The shape of disconnection
State；
-VM2: switch S1, switch S5, switch S7Closure, switch S2, switch S3, switch S4, switch S6, switch S8The shape of disconnection
State；
-VM3: switch S2, switch S5, switch S7Closure, switch S1, switch S3, switch S4, switch S6, switch S8The shape of disconnection
State；
-VM4: switch S4, switch S5, switch S7Closure, switch S1, switch S2, switch S3, switch S6, switch S8The shape of disconnection
State；
-VM5: switch S2, switch S3, switch S4Closure, switch S1, switch S5, switch S6, switch S7, switch S8The shape of disconnection
State；
-VM6: switch S3, switch S6, switch S8Closure, switch S1, switch S2, switch S4, switch S5, switch S7The shape of disconnection
State；
-VM7: switch S2, switch S6, switch S8Closure, switch S1, switch S3, switch S4, switch S5, switch S7The shape of disconnection
State；
-VM8: switch S4, switch S6, switch S8Closure, switch S1, switch S2, switch S3, switch S5, switch S7The shape of disconnection
State；
-VM9: switch S1, switch S6, switch S8Closure, switch S2, switch S3, switch S4, switch S5, switch S7The shape of disconnection
State.
Preferably, in step s1, if+2 level of output, next circuit state is V8；It is next if exporting+1 level
Circuit state is V6, V7-1, V7-2 or V7-3；If output 0 level, next circuit state be V4-1, V4-2, V4-3, V5-1,
V5-2 or V5-3；If exporting -1 level, next circuit state is V3, V2-1, V2-2 or V2-3；It is next if exporting -2 level
A circuit state is V1.
Preferably, in step s2, the setting value is a quarter of busbar voltage.
Preferably, in step s2, the corresponding circuit state of the state of the capacitor charging is greater than for circuit output current
V3 or V6 state when V2-1, V2-2, V2-3, V7-1, V7-2 or V7-3 state or circuit output current when zero are less than zero；Institute
State the corresponding circuit state of state of capacitor electric discharge are as follows: V3 or V6 state or circuit output electricity when circuit output current is greater than zero
V2-1, V2-2, V2-3, V7-1, V7-2 or V7-3 state when flowing less than zero.
Preferably, the state machine includes: the 16 kind switch states and 10 kind intermediate state consistent with circuit state；
Wherein:
The connection relationship of 16 kinds of switch states and 10 kinds of intermediate state are as follows: VM8Between V3 and V1, and two-way cut
Change setting；VM9Between V3 and V4-1, and two-way changeable setting；VM7Between V2-1 and V1, and two-way can be switched sets
It sets；VM6Between V2-1 and V4-1, and two-way changeable setting；VM4Between V5-1 and V7-1, and two-way can be switched sets
It sets；VM3Between V5-1 and V6, and two-way changeable setting；VM2Between V7-1 and V8, and two-way changeable setting；
VM1Between V6 and V8, and two-way changeable setting；V4-2,V4-3,VM0, V7-3, V7-2 be located at V4-1 and V7-1 it
Between, and the single-phase successively switching setting from V4-1 to V7-1；V5-2,V5-3,VM5, V2-3, V2-2 be located at V5-1 and V2-1 it
Between, and the single-phase successively switching setting from V5-1 to V2-1.
Preferably, the state machine further include it is following any one or appoint multiple features:
Each state in state machine will not cause the increase of capacitance short-circuit failure or main switch voltage stress, and
Voltage sine wave is distributed equally state machine in one cycle, to balance the difference being lost between each main switch；
State machine controls the driving signal of main switch, so that in each circuit state of commutation course experience
Under, the voltage stress of each main switch is below a quarter of busbar voltage.
Preferably, close to eight main switches work of DC bus in power frequency, close to four main switches of striding capacitance
Pipe works in carrier frequency.
Modulator approach provided by the invention suitable for active neutral point clamp Five-level converter, it is all in state machine
State makes converter circuit work in safe and efficient circuit mode, i.e., each state in state machine will not cause capacitor short
The problems such as increase of road failure or main switch voltage stress, and state machine is relatively put down voltage sine wave in one cycle
Equal distribution, to balance the difference being lost between each main switch；By the control of the driving signal to main switch, so that
Commutation course experience each circuit state under, the voltage stress of each main switch a quarter of busbar voltage with
Under.
Compared with the Chinese patent application of Publication No. 104601026A, first: modulation strategy proposed by the present invention and its
State machine controls circuit using unique state machine, and the institute in state machine is stateful will not to cause capacitance short-circuit failure
Or main switch voltage stress increase the problems such as；Secondly, the flying capacitor voltage controlling party proposed in invention 104601026A
Method main purpose is to solve the problems, such as that flying capacitor voltage fluctuation is larger in current transformer SHEPWM modulation, and the present invention is logical
The control to the driving signal of main switch is crossed, so that under each circuit state of commutation course experience, each main switch
Voltage stress in a quarter of busbar voltage hereinafter, realizing safe and reliable low-loss modulation and the change of current.Finally, due to
The driving signal of each phase is individually control, therefore the present invention is applicable not only to single-phase ANPC circuit, and be suitable for three-phase three-wire system,
The ANPC inverter circuit of three-phase four-wire system.
Compared with prior art, the present invention have it is following the utility model has the advantages that
The present invention is suitable for the modulator approach of active five level of neutral point clamp (ANPC-5L) current transformer, so that close to direct current
Eight main switches work of bus works in carrier frequency in power frequency, four main switches close to striding capacitance, reaches and subtract
The purpose of Small Switch Losses；The switch stress of the intermediate state undergone in commutation course guarantees a quarter in busbar voltage
Hereinafter, achieving the purpose that protect main switch, and realize the safe and reliable efficient change of current.Since the driving signal of each phase is independent
Control, therefore the present invention is applicable not only to single-phase ANPC circuit, and is suitable for the ANPC inversion of three-phase three-wire system, three-phase four-wire system
Device circuit.
Detailed description of the invention
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, other feature of the invention,
Objects and advantages will become more apparent upon:
Fig. 1 is existing single-phase ANPC inverter circuit structural schematic diagram；
Fig. 2 is state machine diagram of the invention；
Fig. 3 is that single-phase ANPC main circuit is split as positive electricity logical circulation road and negative electricity logical circulation road in modulated process by the present invention
Positive electricity logical circulation road equivalent circuit diagram；
Fig. 4 is that single-phase ANPC main circuit is split as positive electricity logical circulation road and negative electricity logical circulation road in modulated process by the present invention
Negative electricity logical circulation road equivalent circuit diagram；
Fig. 5 is the positive current equivalent circuit diagram in the stage 1 (V8-V6) of the invention in modulated process；
Fig. 6 is the negative current equivalent circuit diagram in the stage 1 (V8-V6) of the invention in modulated process；
Fig. 7 is the positive current equivalent circuit diagram in the stage 2 (V8-V7-1) of the invention in modulated process；
Fig. 8 is the negative current equivalent circuit diagram in the stage 2 (V8-V7-1) of the invention in modulated process；
Fig. 9 is the positive current equivalent circuit diagram in the stage 3 (V6-V5-1) of the invention in modulated process；
Figure 10 is the negative current equivalent circuit diagram in the stage 3 (V6-V5-1) of the invention in modulated process；
Figure 11 is the positive current equivalent circuit diagram in the stage 4 (V5-1-V7-1) of the invention in modulated process；
Figure 12 is the negative current equivalent circuit diagram in the stage 4 (V5-1-V7-1) of the invention in modulated process；
Figure 13 is the positive current equivalent circuit diagram in the stage 5 (V5-1-V2-1) of the invention in modulated process.
Figure 14 is the negative current equivalent circuit diagram in the stage 5 (V5-1-V2-1) of the invention in modulated process.
Specific embodiment
The present invention is described in detail combined with specific embodiments below.Following embodiment will be helpful to the technology of this field
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill of this field
For personnel, without departing from the inventive concept of the premise, various modifications and improvements can be made.These belong to the present invention
Protection scope.
Embodiment
A kind of modulator approach for being suitable for active five level of neutral point clamp (ANPC-5L) current transformer is present embodiments provided,
As shown in Fig. 2~Figure 14, comprising the following steps:
Step 1: each mutually independent progress carrier wave comparison determines output level.
Step 2: according to different circuit states and according to the instruction of state machine, the circuit state of next needs is obtained
With the driving signal of main switch.
Further, the step 1 specifically includes following sub-step:
Step S1, each phase modulating wave are compared with four carrier waves respectively, generate four logical relations (positive and negative), if adjusting
Wave height processed generates 1 in carrier wave, if carrier wave is higher than modulating wave, generates 0；
Step S2 judges four logical relations, if four be 1, exports+2 level；If three is 1, another
It is 0, then exports+1 level；If the two is 1, both another is 0, then exports 0 level；If three is 0, another is 1, then exports -1 electricity
It is flat；If four be 0, -2 level are exported；
Step S3, the output level that step S2 is obtained is temporary, corresponds with the circuit output level of step 2；
Further, the step 2 specifically includes following sub-step:
Step s1 determines the circuit state of next needs according to the output level that step 1 generates, if+2 electricity of output
Flat, next circuit state is V8；If exporting+1 level, next circuit state is V6, V7-1, V7-2 or V7-3；If output 0
Level, next circuit state are V4-1, V4-2, V4-3, V5-1, V5-2 or V5-3；If exporting -1 level, next circuit shape
State is V3, V2-1, V2-2 or V2-3；If exporting -2 level, next circuit state is V1；
Step s2 exports electric current and striding capacitance voltage condition according to actual circuit, further determines that next circuit shape
State, if capacitance voltage is lower than setting value (i.e. a quarter of busbar voltage), circuit state can use table 1, capacitor charging in table 2
State；If capacitance voltage is higher than setting value (i.e. a quarter of busbar voltage), circuit state can use that table 1, capacitor discharges in table 2
State；
Step s3, according to the instruction of state machine, as shown in Fig. 2, showing that circuit reaches desirable circuit state from current state
Nearest step, and successively implement；
Step s4, according to the relationship listed by table 1, table 2 between circuit state and main switch signal, by each circuit state
The driving signal for being converted to corresponding main switch controls the turn-on and turn-off of main switch.
Further, the state machine include: 16 kinds of switch states (V8, V7-1, V7-2, V7-3, V6, V5-1, V5-2,
V5-3, V4-1, V4-2, V4-3, V3, V2-1, V2-2, V2-3, V1) and 10 kinds of intermediate state (VM0、VM1、VM2、VM3、VM4、VM5、
VM6、VM7、VM8、VM9), connection relationship are as follows: VM8It is two-way changeable between V3 and V1；VM9It is double between V3 and V4-1
To changeable；VM7It is two-way changeable between V2-1 and V1；VM6It is two-way changeable between V2-1 and V4-1；VM4Position
It is two-way changeable between V5-1 and V7-1；VM3It is two-way changeable between V5-1 and V6；VM2Positioned at V7-1 and V8 it
Between, it is two-way changeable；VM1It is two-way changeable between V6 and V8；V4-2,V4-3,VM0, V7-3, V7-2 be located at V4-1 and
It is single-phase from V4-1 to V7-1 successively to switch between V7-1；V5-2,V5-3,VM5, V2-3, V2-2 between V5-1 and V2-1, from
V5-1 to V2-1 is single-phase successively to be switched.
Table 1 is ANPC converter switches state table；Table 2 is ANPC converter intermediate state table.
Table 1
a.C: charging；D: electric discharge
Table 2
| State | S1 | S2 | S3 | S4 | S5 | S6 | S7 | S8 | State | S1 | S2 | S3 | S4 | S5 | S6 | S7 | S8 |
| VM0 | 1 | 0 | 1 | 1 | 0 | 0 | 0 | 0 | VM5 | 0 | 1 | 1 | 1 | 0 | 0 | 0 | 0 |
| VM1 | 0 | 0 | 1 | 0 | 1 | 0 | 1 | 0 | VM6 | 0 | 0 | 1 | 0 | 0 | 1 | 0 | 1 |
| VM2 | 1 | 0 | 0 | 0 | 1 | 0 | 1 | 0 | VM7 | 0 | 1 | 0 | 0 | 0 | 1 | 0 | 1 |
| VM3 | 0 | 1 | 0 | 0 | 1 | 0 | 1 | 0 | VM8 | 0 | 0 | 0 | 1 | 0 | 1 | 0 | 1 |
| VM4 | 0 | 0 | 0 | 1 | 1 | 0 | 1 | 0 | VM9 | 1 | 0 | 0 | 0 | 0 | 1 | 0 | 1 |
In the present embodiment state machine institute it is stateful make converter circuit work in safe and efficient circuit mode, i.e., should
State will not cause the problems such as increase of capacitance short-circuit failure or main switch voltage stress, and the state machine is by voltage sine wave
Average distribution is carried out, in one cycle to balance the difference being lost between each main switch.
The present embodiment is by the control of the driving signal to main switch, so that in each circuit shape of commutation course experience
Under state, the voltage stress of each main switch is below a quarter of busbar voltage.
The present embodiment makes eight main switches work close to DC bus in power frequency, close to four masters of striding capacitance
Switching tube work achievees the purpose that reduce switching loss in carrier frequency；The switch of the intermediate state undergone in commutation course is answered
Power guarantees a quarter in busbar voltage hereinafter, achieving the purpose that protect main switch.Since the driving signal of each phase is
Individually control, therefore the present invention is applicable not only to single-phase ANPC circuit, and is suitable for the ANPC of three-phase three-wire system, three-phase four-wire system
Inverter circuit.
The present embodiment is further illustrated with reference to the accompanying drawing.
Shape for being suitable for the modulator approach of active five level of neutral point clamp (ANPC-5L) current transformer, in modulated process
State switching is as shown in Figure 2, in which:
As shown in figure 3, single-phase ANPC main circuit is split as positive electricity logical circulation road and negative electricity logical circulation road, facilitate subsequent research
Explanation.
Stage 1 (V8-V6):
As shown in figure 4, from V8 state (S1、S3、S5、S7Closure, S2、S4、S6、S8Dead circuit state) change of current is to V6 shape
State (S2、S3、S5、S7Closure, S1、S4、S6、S8Dead circuit state), first disconnect S1, reclose S2, when output electric current is greater than zero
When, the change of current occurs disconnect S1When；When exporting electric current less than zero, the change of current occurs in closure S2When.Vice versa.
Stage 2 (V8-V7-1):
As shown in figure 5, from V8 state (S1、S3、S5、S7Closure, S2、S4、S6、S8Dead circuit state) change of current is to V7-1
State (S1、S4、S5、S7Closure, S2、S3、S6、S8Dead circuit state), first disconnect S3, reclose S4, when output electric current is greater than
When zero, the change of current occurs disconnect S3When；When exporting electric current less than zero, the change of current occurs in closure S4When.Vice versa.
Stage 3 (V6-V5-1):
As shown in fig. 6, from V6 state (S2、S3、S5、S7Closure, S1、S4、S6、S8Dead circuit state) change of current is to V5-1
State (S2、S4、S5、S7Closure, S1、S3、S6、S8Dead circuit state), first disconnect S3, reclose S4, when output electric current is greater than
When zero, the change of current occurs disconnect S3When；When exporting electric current less than zero, the change of current occurs in closure S4When.Vice versa.
Stage 4 (V5-1-V7-1):
As shown in fig. 7, from V5-1 state (S2、S4、S5、S7Closure, S1、S3、S6、S8Dead circuit state) change of current is to V7-
1 state (S1、S4、S5、S7Closure, S2、S3、S6、S8Dead circuit state), first disconnect S2, reclose S1, when output electric current is big
When zero, the change of current occurs in closure S1When；When exporting electric current less than zero, the change of current occurs disconnect S2When.Vice versa.
Stage 5 (V5-1-V2-1):
As shown in figure 8, from V5-1 state (S2、S4、S5、S7Closure, S1、S3、S6、S8Dead circuit state) change of current is to V2-
1 state (S2、S3、S6、S8Closure, S1、S4、S5、S7Dead circuit state), first disconnect S5, it is closed S3, then disconnect S7, it is closed S6,
Then disconnect S4, it is closed S8, when exporting electric current greater than zero, the change of current occurs disconnect S7When；When exporting electric current less than zero, change
Stream occurs in closure S6When.
Based on the above embodiment, the present invention is suitable for the modulation plan of active five level of neutral point clamp (ANPC-5L) current transformer
Slightly and its state machine makes eight main switches work close to DC bus in power frequency, close to four main switches of striding capacitance
Pipe work achievees the purpose that reduce switching loss in carrier frequency；The switch stress of the intermediate state undergone in commutation course is equal
Guarantee a quarter in busbar voltage hereinafter, achieving the purpose that protect main switch, and realizes the safe and reliable efficient change of current.
Since the driving signal of each phase is individually control, therefore the present invention is applicable not only to single-phase ANPC circuit, and is suitable for three-phase three
The ANPC inverter circuit of line system, three-phase four-wire system.
Specific embodiments of the present invention are described above.It is to be appreciated that the invention is not limited to above-mentioned
Particular implementation, those skilled in the art can make various deformations or amendments within the scope of the claims, this not shadow
Substantive content of the invention is rung, protection scope of the present invention is defined by the appended claims.
Claims (9)
1. a kind of modulator approach suitable for active neutral point clamp Five-level converter, which is characterized in that it is single-phase it is described it is active in
Point clamp Five-level converter has the full control main switch S of anti-paralleled diode by 121~S8With a striding capacitance CfStructure
At described 12 main switches with anti-paralleled diode are respectively as follows: a main switch S1, a main switch S2, one
A main switch S3, a main switch S4, two main switch S5, two main switch S6, two main switch S7, two masters
Switching tube S8, in which: two main switch S5, a main switch S3, a main switch S1, a main switch S2, one
Main switch S4, two main switch S8It is sequentially connected in series rear and Up Highway UHW capacitor CUP, Down Highway capacitor CDOWNParallel connection, in main switch
Pipe S1、S2Tie point draw exchange outlet, two main switch S6, two main switch S7It is sequentially connected in series rear and main switch
S3、S1、S2、S4The whole parallel connection being connected into, main switch S6、S7Tie point and Up Highway UHW capacitor CUP, Down Highway capacitor CDOWN
Tie point be connected, striding capacitance CfWith main switch S1、S2What is be connected into is whole in parallel；
The modulator approach the following steps are included:
Step 1: each phase modulating wave independently carries out carrier wave comparison, determines output level, one by one for the circuit state with step 2
It is corresponding；
Step 2: according to different circuit states and according to the instruction of state machine, next circuit state and main switch are obtained
S1-S8Driving signal；
The circuit state includes: 16 kinds of switch states and 10 kinds of intermediate state；Wherein:
16 kinds of switch states are respectively as follows:
- V8: main switch S1, main switch S3, two main switch S5, two main switch S7Closure, main switch S2, master open
Close pipe S4, two main switch S6, two main switch S8The state of disconnection；
- V7-1: main switch S1, main switch S4, two main switch S5, two main switch S7Closure, main switch S2, it is main
Switching tube S3, two main switch S6, two main switch S8The state of disconnection；
- V7-2: main switch S1, main switch S4, two main switch S7Closure, main switch S2, main switch S3, two masters
Switching tube S5, two main switch S6, two main switch S8The state of disconnection；
- V7-3: main switch S1, main switch S3, main switch S4, two main switch S7Closure, main switch S2, two masters
Switching tube S5, two main switch S6, two main switch S8The state of disconnection；
- V6: main switch S2, main switch S3, two main switch S5, two main switch S7Closure, main switch S1, master open
Close pipe S4, two main switch S6, two main switch S8The state of disconnection；
- V5-1: main switch S2, main switch S4, two main switch S5, two main switch S7Closure, main switch S1, it is main
Switching tube S3, two main switch S6, two main switch S8The state of disconnection；
- V5-2: main switch S2, main switch S4, two main switch S7Closure, main switch S1, main switch S3, two masters
Switching tube S5, two main switch S6, two main switch S8The state of disconnection；
- V5-3: main switch S2, main switch S3, main switch S4, two main switch S7Closure, main switch S1, two masters
Switching tube S5, two main switch S6, two main switch S8The state of disconnection；
- V4-1: main switch S1, main switch S3, two main switch S6, two main switch S8Closure, main switch S2, it is main
Switching tube S4, two main switch S5, two main switch S7The state of disconnection；
- V4-2: main switch S1, main switch S3, two main switch S6Closure, main switch S2, main switch S4, two masters
Switching tube S5, two main switch S7, two main switch S8The state of disconnection；
- V4-3: main switch S1, main switch S3, main switch S4, two main switch S6Closure, main switch S2, two masters
Switching tube S5, two main switch S7, two main switch S8The state of disconnection；
- V3: main switch S1, main switch S4, two main switch S6, two main switch S8Closure, main switch S2, master open
Close pipe S3, two main switch S5, two main switch S7The state of disconnection；
- V2-1: main switch S2, main switch S3, two main switch S6, two main switch S8Closure, main switch S1, it is main
Switching tube S4, two main switch S5, two main switch S7The state of disconnection；
- V2-2: main switch S2, main switch S3, two main switch S6Closure, main switch S1, main switch S4, main switch
Pipe S5, two main switch S7, two main switch S8The state of disconnection；
- V2-3: main switch S2, main switch S3, main switch S4, two main switch S6Closure, main switch S1, two masters
Switching tube S5, two main switch S7, two main switch S8The state of disconnection；
- V1: main switch S2, main switch S4, two main switch S6, two main switch S8Closure, main switch S1, master open
Close pipe S3, two main switch S5, two main switch S7The state of disconnection；
10 kinds of intermediate state are respectively as follows:
-VM0: main switch S1, main switch S3, main switch S4Closure, main switch S2, two main switch S5, two masters open
Close pipe S7, two main switch S6, two main switch S8The state of disconnection；
-VM1: main switch S3, two main switch S5, two main switch S7Closure, main switch S1, main switch S2, master open
Close pipe S4, two main switch S6, two main switch S8The state of disconnection；
-VM2: main switch S1, two main switch S5, two main switch S7Closure, main switch S2, main switch S3, master open
Close pipe S4, two main switch S6, two main switch S8The state of disconnection；
-VM3: main switch S2, two main switch S5, two main switch S7Closure, main switch S1, main switch S3, master open
Close pipe S4, two main switch S6, two main switch S8The state of disconnection；
-VM4: main switch S4, two main switch S5, two main switch S7Closure, main switch S1, main switch S2, master open
Close pipe S3, two main switch S6, two main switch S8The state of disconnection；
-VM5: main switch S2, main switch S3, main switch S4Closure, main switch S1, two main switch S5, two masters open
Close pipe S6, two main switch S7, two main switch S8The state of disconnection；
-VM6: main switch S3, two main switch S6, two main switch S8Closure, main switch S1, main switch S2, master open
Close pipe S4, two main switch S5, two main switch S7The state of disconnection；
-VM7: main switch S2, two main switch S6, two main switch S8Closure, main switch S1, main switch S3, master open
Close pipe S4, two main switch S5, two main switch S7The state of disconnection；
-VM8: main switch S4, two main switch S6, two main switch S8Closure, main switch S1, main switch S2, master open
Close pipe S3, two main switch S5, two main switch S7The state of disconnection；
-VM9: main switch S1, two main switch S6, two main switch S8Closure, main switch S2, main switch S3, master open
Close pipe S4, two main switch S5, two main switch S7The state of disconnection.
2. the modulator approach according to claim 1 suitable for active neutral point clamp Five-level converter, which is characterized in that
The step 1 specifically includes following sub-step:
Step S1, each phase modulating wave are compared with four carrier waves respectively, generate four logical relations, are carried if modulating wave is higher than
Wave then generates 1, if carrier wave is higher than modulating wave, generates 0；
Step S2 judges four logical relations, if four be 1, exports+2 level；If three is 1, another is 0,
Then export+1 level；If the two is 1, both another is 0, then exports 0 level；If three is 0, another is 1, then exports -1 level；
If four be 0, -2 level are exported；
Step S3, the output level that step S2 is obtained is temporary, for corresponding with the circuit state of step 2.
3. the modulator approach according to claim 2 suitable for active neutral point clamp Five-level converter, which is characterized in that
The step 2 specifically includes following sub-step:
Step s1, the output level obtained according to step 1 determine next circuit state；
Step s2 exports electric current and striding capacitance voltage condition according to actual circuit, further determines that next circuit state, if
Capacitance voltage is lower than setting value, and next circuit state takes the state of capacitor charging；If capacitance voltage is higher than setting value, next
The state that circuit state takes capacitor to discharge；
Step s3 show that circuit reaches the nearest step of next circuit state from current circuit state according to the instruction of state machine
Suddenly, and successively implement；
Step s4 is converted to each circuit state pair according to the relationship between circuit state and the driving signal of main switch
The driving signal for the main switch answered controls the turn-on and turn-off of main switch.
4. the modulator approach according to claim 3 suitable for active neutral point clamp Five-level converter, which is characterized in that
In step s1, if+2 level of output, next circuit state is V8；If output+1 level, next circuit state be V6,
V7-1, V7-2 or V7-3；If exporting 0 level, next circuit state is V4-1, V4-2, V4-3, V5-1, V5-2 or V5-3；If
- 1 level is exported, next circuit state is V3, V2-1, V2-2 or V2-3；If exporting -2 level, next circuit state is
V1。
5. the modulator approach according to claim 3 suitable for active neutral point clamp Five-level converter, which is characterized in that
In step s2, the setting value is a quarter of busbar voltage.
6. the modulator approach according to claim 3 suitable for active neutral point clamp Five-level converter, which is characterized in that
In step s2, the corresponding circuit state of the state of the capacitor charging is following any:
Circuit output current is greater than V2-1, V2-2, V2-3, V7-1, V7-2 or V7-3 state when zero；
V3 or V6 state when circuit output current is less than zero；
The corresponding circuit state of state of the capacitor electric discharge is following any:
Circuit output current is greater than V3 or V6 state when zero；
V2-1, V2-2, V2-3, V7-1, V7-2 or V7-3 state when circuit output current is less than zero.
7. the modulator approach according to claim 1 suitable for active neutral point clamp Five-level converter, which is characterized in that
The handoff relation of 16 kinds of switch states and 10 kinds of intermediate state are as follows: VM8Between V3 and V1, and two-way changeable setting；
VM9Between V3 and V4-1, and two-way changeable setting；VM7Between V2-1 and V1, and two-way changeable setting；VM6Position
Between V2-1 and V4-1, and two-way changeable setting；VM4Between V5-1 and V7-1, and two-way changeable setting；VM3Position
Between V5-1 and V6, and two-way changeable setting；VM2Between V7-1 and V8, and two-way changeable setting；VM1Positioned at V6
Between V8, and two-way changeable setting；V4-2,V4-3,VM0, V7-3, V7-2 be located between V4-1 and V7-1, and from
V4-1 to V7-1 unidirectionally successively switching setting；V5-2,V5-3,VM5, V2-3, V2-2 be located between V5-1 and V2-1, and from
V5-1 to V2-1 unidirectionally successively switching setting.
8. the modulator approach according to claim 7 suitable for active neutral point clamp Five-level converter, which is characterized in that
Each state in the state machine will not cause the increase of capacitance short-circuit failure or main switch voltage stress, and state machine
Voltage sine wave is distributed equally in one cycle, to balance the difference being lost between each main switch；And/or
The state machine controls the driving signal of main switch, so that under each circuit state of commutation course experience, respectively
The voltage stress of a main switch is below a quarter of busbar voltage.
9. the modulator approach according to claim 8 suitable for active neutral point clamp Five-level converter, it is characterised in that:
In power frequency, four main switches close to striding capacitance work in carrier frequency for eight main switches work close to DC bus
Rate.
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| CN109995255A (en) * | 2019-03-04 | 2019-07-09 | 易事特集团股份有限公司 | AC/DC convertor, five level topology units and its modulator approach |
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| CN112688583B (en) * | 2020-12-15 | 2021-11-30 | 西安奇点能源技术有限公司 | Three-level PWM signal implementation method |
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