CN107276442A - Suitable for the modulator approach of active neutral point clamp Five-level converter - Google Patents
Suitable for the modulator approach of active neutral point clamp Five-level converter Download PDFInfo
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- CN107276442A CN107276442A CN201710400923.XA CN201710400923A CN107276442A CN 107276442 A CN107276442 A CN 107276442A CN 201710400923 A CN201710400923 A CN 201710400923A CN 107276442 A CN107276442 A CN 107276442A
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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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a kind of modulator approach suitable for active neutral point clamp Five-level converter, comprise the following steps, it is each mutually it is independent carry out carrier wave ratio compared with, 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 drive signal of main switch are obtained.The invention make it that eight main switches close to dc bus are operated in power frequency, and carrier frequency is operated in close to four main switches of striding capacitance, reduces switching loss；The switch stress of the intermediateness undergone in commutation course ensures below a quarter of busbar voltage, reaches the purpose of protection main switch.Because the drive signal of each phase is independent control, therefore the present invention is applicable not only to single-phase ANPC circuits, and suitable for three-phase three-wire system, the ANPC inverter circuits of three-phase four-wire system.
Description
Technical field
The present invention relates to a kind of safe and reliable low-loss modulation strategy, in particular it relates to a kind of suitable for active
The modulator approach of point clamp five level (ANPC-5L) current transformer.
Background technology
The active level of neutral point clamp five (Active Neutral Point Clamped-Five Level) current transformer, its
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
Into.This single-phase Five-level converter can realize function of generating electricity by way of merging two or more grid systems, can also bringing onto load independent operating and motor, and
And the voltage stress of main switch is a quarter of busbar voltage in circuit.But, there is more switching tube in circuit
And electric capacity, i.e. circuit have more open position, and wherein most can cause capacitance short-circuit failure or main switch voltage
The problems such as increase of stress.How so that circuit is remained in commutation course under safe and reliable open position, it is
In ANPC circuit studies and practical application the problem of urgent need to resolve.
Through retrieval, Publication No. 104601026A Chinese patent application, the invention provides a kind of change of level of ANPC five
The flying capacitor voltage control method during SHEPWM modulation of device is flowed, according to the magnitude of voltage of flying capacitor voltage, with flying capacitor
The reference value of voltage is compared, and is determined that flying capacitor needs to charge or discharged, the positive and negative of load current is then detected, with true
Determine the Redundanter schalter state of ANPC converters.The invention solve the current transformer SHEPWM modulation in flying capacitor voltage pulsation compared with
Big the problem of.
Currently without the explanation or report for finding technology similar to the present invention, money similar both at home and abroad is also not yet collected into
Material.
The content of the invention
For drawbacks described above present in prior art, active neutral point clamp is applied to it is an object of the invention to provide one kind
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, comprises the following steps：
Step one：Each phase modulating wave independently carries out carrier wave ratio compared with determining 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 drive signal of main switch.
Preferably, the step one specifically includes following sub-step：
Step S1, each phase modulating wave is compared with four carrier waves respectively, generates 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；
Four logical relations are judged by step S2, if four be 1, export+2 level；If three is 1, another
For 0, then+1 level is exported；If both are 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 kept in, for being corresponded 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 one determines the circuit state of next needs；
Step s2, according to actual circuit output current and striding capacitance voltage condition, further determines that next circuit shape
State, if capacitance voltage is less than setting value (i.e. a quarter of busbar voltage), circuit state can use what electric capacity in table 1, table 2 charged
State；If capacitance voltage is higher than setting value (i.e. a quarter of busbar voltage), circuit state can use electric capacity in table 1, table 2 and discharge
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 implement successively；
Step s4, according to the relation listed by table 1, table 2 between circuit state and the drive signal of main switch, by each electricity
Line state is converted to the drive 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 on off states and 10 kinds of intermediatenesses；
Wherein：
16 kinds of on off states are respectively：
-V8：Switch S1, switch S3, switch S5, switch S7Closure, switchs S2, switch S4, switch S6, switch S8The shape of disconnection
State；
-V7-1：Switch S1, switch S4, switch S5, switch S7Closure, switchs S2, switch S3, switch S6, switch S8Disconnect
State；
-V7-2：Switch S1, switch S4, switch S7Closure, switchs S2, switch S3, switch S5, switch S6, switch S8Disconnect
State；
-V7-3：Switch S1, switch S3, switch S4, switch S7Closure, switchs S2, switch S5, switch S6, switch S8Disconnect
State；
-V6：Switch S2, switch S3, switch S5, switch S7Closure, switchs S1, switch S4, switch S6, switch S8The shape of disconnection
State；
-V5-1：Switch S2, switch S4, switch S5, switch S7Closure, switchs S1, switch S3, switch S6, switch S8Disconnect
State；
-V5-2：Switch S2, switch S4, switch S7Closure, switchs S1, switch S3, switch S5, switch S6, switch S8Disconnect
State；
-V5-3：Switch S2, switch S3, switch S4, switch S7Closure, switchs S1, switch S5, switch S6, switch S8Disconnect
State；
-V4-1：Switch S1, switch S3, switch S6, switch S8Closure, switchs S2, switch S4, switch S5, switch S7Disconnect
State；
-V4-2：Switch S1, switch S3, switch S6Closure, switchs S2, switch S4, switch S5, switch S7, switch S8Disconnect
State；
-V4-3：Switch S1, switch S3, switch S4, switch S6Closure, switchs S2, switch S5, switch S7, switch S8Disconnect
State；
-V3：Switch S1, switch S4, switch S6, switch S8Closure, switchs S2, switch S3, switch S5, switch S7The shape of disconnection
State；
-V2-1：Switch S2, switch S3, switch S6, switch S8Closure, switchs S1, switch S4, switch S5, switch S7Disconnect
State；
-V2-2：Switch S2, switch S3, switch S6Closure, switchs S1, switch S4, switch S5, switch S7, switch S8Disconnect
State；
-V2-3：Switch S2, switch S3, switch S4, switch S6Closure, switchs S1, switch S5, switch S7, switch S8Disconnect
State；
-V1：Switch S2, switch S4, switch S6, switch S8Closure, switchs S1, switch S3, switch S5, switch S7The shape of disconnection
State；
10 kinds of intermediatenesses are respectively：
-VM0：Switch S1, switch S3, switch S4Closure, switchs S2, switch S5, switch S7, switch S6, switch S8The shape of disconnection
State；
-VM1：Switch S3, switch S5, switch S7Closure, switchs S1, switch S2, switch S4, switch S6, switch S8The shape of disconnection
State；
-VM2：Switch S1, switch S5, switch S7Closure, switchs S2, switch S3, switch S4, switch S6, switch S8The shape of disconnection
State；
-VM3：Switch S2, switch S5, switch S7Closure, switchs S1, switch S3, switch S4, switch S6, switch S8The shape of disconnection
State；
-VM4：Switch S4, switch S5, switch S7Closure, switchs S1, switch S2, switch S3, switch S6, switch S8The shape of disconnection
State；
-VM5：Switch S2, switch S3, switch S4Closure, switchs S1, switch S5, switch S6, switch S7, switch S8The shape of disconnection
State；
-VM6：Switch S3, switch S6, switch S8Closure, switchs S1, switch S2, switch S4, switch S5, switch S7The shape of disconnection
State；
-VM7：Switch S2, switch S6, switch S8Closure, switchs S1, switch S3, switch S4, switch S5, switch S7The shape of disconnection
State；
-VM8：Switch S4, switch S6, switch S8Closure, switchs S1, switch S2, switch S3, switch S5, switch S7The shape of disconnection
State；
-VM9：Switch S1, switch S6, switch S8Closure, switchs 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
Individual 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 state of the electric capacity charging is more than for circuit output current
V2-1, V2-2, V2-3, V7-1, V7-2 or V7-3 state or circuit output current when zero are less than V3 or V6 states when zero；Institute
State electric capacity electric discharge the corresponding circuit state of state be：V3 or V6 states or circuit output electricity when circuit output current is more than zero
Stream is less than V2-1, V2-2, V2-3, V7-1, V7-2 or V7-3 state when zero.
Preferably, the state machine includes：The 16 kind on off states consistent with circuit state and 10 kinds of intermediatenesses；
Wherein：
The annexation of 16 kinds of on off states and 10 kinds of intermediatenesses is：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 changeable set
Put；VM6Between V2-1 and V4-1, and two-way changeable setting；VM4Between V5-1 and V7-1, and two-way changeable set
Put；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 respectively be located at V4-1 and V7-1 it
Between, and single-phase switching successively is set from V4-1 to V7-1；V5-2、V5-3、VM5, V2-3, V2-2 respectively be located at V5-1 and V2-1 it
Between, and single-phase switching successively is set from V5-1 to V2-1.
Preferably, the state machine also 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 a cycle, to balance the difference being lost between each main switch；
- state machine is controlled to the drive signal of main switch so that each circuit state undergone in commutation course
Under, the voltage stress of each main switch is below a quarter of busbar voltage.
Preferably, eight main switches close to dc bus are operated in power frequency, close to four main switches of striding capacitance
Pipe is operated in carrier frequency.
It is all in the modulator approach suitable for active neutral point clamp Five-level converter that the present invention is provided, its state machine
State makes converter circuit be operated in safe and efficient circuit mode, i.e., each state in state machine will not cause electric capacity short
The problems such as increase of road failure or main switch voltage stress, and state machine relatively put down voltage sine wave in a cycle
Equal distribution, to balance the difference being lost between each main switch；Pass through the control of the drive signal to main switch so that
Under each circuit state of commutation course experience, the voltage stress of each main switch busbar voltage a quarter with
Under.
Compared with Publication No. 104601026A Chinese patent application, first：Modulation strategy proposed by the present invention and its
State machine is controlled using unique state machine to circuit, 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 problem of flying capacitor voltage pulsation is larger in current transformer SHEPWM modulation, and the present invention is logical
Cross the control to the drive signal of main switch so that under each circuit state that commutation course undergoes, each main switch
Voltage stress below a quarter of busbar voltage, realize safe and reliable low-loss modulation and the change of current.Finally, due to
The drive signal of each phase is independent control, therefore the present invention is applicable not only to single-phase ANPC circuits, and suitable for three-phase three-wire system,
The ANPC inverter circuits of three-phase four-wire system.
Compared with prior art, the present invention has following beneficial effect：
The present invention is applied to the modulator approach of the active level of neutral point clamp five (ANPC-5L) current transformer so that close to direct current
Eight main switches of bus are operated in power frequency, and four main switches close to striding capacitance are operated in carrier frequency, reach and subtract
The purpose of Small Switch Losses；The switch stress of the intermediateness undergone in commutation course ensures a quarter in busbar voltage
Hereinafter, the purpose of protection main switch is reached, and realizes the safe and reliable efficient change of current.Because the drive signal of each phase is independent
Control, therefore the present invention is applicable not only to single-phase ANPC circuits, and suitable for three-phase three-wire system, the ANPC inversions of three-phase four-wire system
Device circuit.
Brief description of the drawings
By reading the detailed description made with reference to the following drawings to non-limiting example, further feature of the invention,
Objects and advantages will become more apparent upon：
Fig. 1 is existing single-phase ANPC inverter circuits structural representation；
Fig. 2 is the state machine diagram of the present invention；
Fig. 3 is that single-phase ANPC main circuits are split as positive electricity logical circulation road and negative electricity logical circulation road by the present invention in modulated process
Positive electricity logical circulation road equivalent circuit diagram；
Fig. 4 is that single-phase ANPC main circuits are split as positive electricity logical circulation road and negative electricity logical circulation road by the present invention in modulated process
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.
Embodiment
With reference to specific embodiment, the present invention is described in detail.Following examples will be helpful to the technology of this area
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that to the ordinary skill of this area
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 domain.
Embodiment
A kind of modulator approach for being applied to the active level of neutral point clamp five (ANPC-5L) current transformer is present embodiments provided,
As shown in Fig. 2~Figure 14, comprise the following steps：
Step one：Each mutually independent carrier wave ratio that carries out is compared with determining 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 drive signal of main switch.
Further, the step one specifically includes following sub-step：
Step S1, each phase modulating wave is compared with four carrier waves respectively, generates four logical relations (positive and negative), if adjusting
Wave height processed is in carrier wave, generation 1, if carrier wave is higher than modulating wave, generation 0；
Four logical relations are judged by step S2, if four be 1, export+2 level；If three is 1, another
For 0, then+1 level is exported；If both are 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 kept in, and is corresponded with the circuit output level of step 2；
Further, the step 2 specifically includes following sub-step：
Step s1, the output level generated according to step one, determines the circuit state of next needs, if the electricity of output+2
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 is 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, according to actual circuit output current and striding capacitance voltage condition, further determines that next circuit shape
State, if capacitance voltage is less than setting value (i.e. a quarter of busbar voltage), circuit state can use what electric capacity in table 1, table 2 charged
State；If capacitance voltage is higher than setting value (i.e. a quarter of busbar voltage), circuit state can use electric capacity in table 1, table 2 and discharge
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 implement successively；
Step s4, according to the relation listed by table 1, table 2 between circuit state and main switch signal, by each circuit state
The drive signal of corresponding main switch is converted to, the turn-on and turn-off of main switch are controlled.
Further, the state machine includes：16 kinds of on off 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 intermediateness (VM0、VM1、VM2、VM3、VM4、VM5、
VM6、VM7、VM8、VM9), its annexation is：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 to switch successively between V7-1；V5-2、V5-3、VM5, V2-3, V2-2 be located between V5-1 and V2-1, from
V5-1 to V2-1 is single-phase to be switched successively.
Table 1 is ANPC converter switches state tables；Table 2 is ANPC converter intermediateness tables.
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 converter circuit is operated in safe and efficient circuit mode, i.e., should
The problems such as state will not cause the 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 a cycle, to balance the difference being lost between each main switch.
The control that the present embodiment passes through the drive signal to main switch so that each circuit shape undergone in commutation course
Under state, the voltage stress of each main switch is below a quarter of busbar voltage.
The present embodiment make it that eight main switches close to dc bus are operated in power frequency, close to four masters of striding capacitance
Switching tube is operated in carrier frequency, reaches the purpose for reducing switching loss；The switch of the intermediateness undergone in commutation course should
Power ensures below a quarter of busbar voltage, reaches the purpose of protection main switch.Because the drive signal of each phase is
Individually control, therefore the present invention is applicable not only to single-phase ANPC circuits, and suitable for three-phase three-wire system, the ANPC of three-phase four-wire system
Inverter circuit.
The present embodiment is further illustrated below in conjunction with the accompanying drawings.
For the modulator approach suitable for the active level of neutral point clamp five (ANPC-5L) current transformer, the shape in modulated process
State switches as shown in Fig. 2 wherein：
As shown in figure 3, single-phase ANPC main circuits are split as into 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 states (S1、S3、S5、S7Closure, S2、S4、S6、S8Dead circuit state) change of current is to V6 shapes
State (S2、S3、S5、S7Closure, S1、S4、S6、S8Dead circuit state), first disconnect S1, it is closed again S2, when output current is more than zero
When, the change of current occurs disconnect S1When；When output current is 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 states (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, it is closed again S4, when output current is more than
When zero, the change of current occurs disconnect S3When；When output current is 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 states (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, it is closed again S4, when output current is more than
When zero, the change of current occurs disconnect S3When；When output current is 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 states (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, it is closed again S1, when output current is big
When zero, the change of current occurs in closure S1When；When output current is 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 states (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, close S3, then disconnect S7, close S6,
Then disconnect S4, close S8, when output current is more than zero, the change of current occurs disconnect S7When；When output current is less than zero, change
Stream occurs in closure S6When.
Based on above-described embodiment, the present invention is applied to the modulation plan of the active level of neutral point clamp five (ANPC-5L) current transformer
Omit and its state machine make it that eight main switches close to dc bus are operated in power frequency, close to four main switches of striding capacitance
Pipe is operated in carrier frequency, reaches the purpose for reducing switching loss；The switch stress of the intermediateness undergone in commutation course is equal
Ensure below a quarter of busbar voltage, reach the purpose of protection main switch, and realize the safe and reliable efficient change of current.
Because the drive signal of each phase is independent control, therefore the present invention is applicable not only to single-phase ANPC circuits, and suitable for three-phase three
The ANPC inverter circuits of line system, three-phase four-wire system.
The specific embodiment of the present invention is described above.It is to be appreciated that the invention is not limited in above-mentioned
Particular implementation, those skilled in the art can make various deformations or amendments within the scope of the claims, this not shadow
The substantive content of the present invention is rung, protection scope of the present invention is defined by the appended claims.
Claims (10)
1. a kind of modulator approach suitable for active neutral point clamp Five-level converter, it is characterised in that comprise the following steps：
Step one：Each phase modulating wave independently carries out carrier wave ratio compared with determining output level；
Step 2：According to different circuit states and according to the instruction of state machine, circuit state and the master of next needs are obtained
The drive signal of switching tube.
2. the modulator approach according to claim 1 suitable for active neutral point clamp Five-level converter, it is characterised in that
The step one specifically includes following sub-step：
Step S1, each phase modulating wave is compared with four carrier waves respectively, generates four logical relations, if modulating wave is higher than load
Ripple, then generate 1, if carrier wave is higher than modulating wave, generates 0；
Four logical relations are judged by step S2, if four be 1, export+2 level；If three is 1, another is 0,
Then export+1 level；If both are 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 kept in, for being corresponded with the circuit state of step 2.
3. the modulator approach according to claim 2 suitable for active neutral point clamp Five-level converter, it is characterised in that
The step 2 specifically includes following sub-step：
Step s1, the output level obtained according to step one determines the circuit state of next needs；
Step s2, according to actual circuit output current and striding capacitance voltage condition, further determines that next circuit state, if
Capacitance voltage is less than setting value, the state of circuit state power taking capacity charge；If capacitance voltage is higher than setting value, circuit state power taking
The state of discharge capacitor；
Step s3, according to the instruction of state machine, show that circuit reaches the nearest step of desirable circuit state from current circuit state,
And implement successively；
Step s4, according to the relation between the drive signal of circuit state and main switch, each circuit state is converted to pair
The drive signal for the main switch answered, controls the turn-on and turn-off of main switch.
4. the modulator approach suitable for active neutral point clamp Five-level converter according to claim 1 or 3, its feature exists
In the circuit state includes：16 kinds of on off states and 10 kinds of intermediatenesses；Wherein：
16 kinds of on off states are respectively：
-V8：Switch S1, switch S3, switch S5, switch S7Closure, switchs S2, switch S4, switch S6, switch S8The state of disconnection；
-V7-1：Switch S1, switch S4, switch S5, switch S7Closure, switchs S2, switch S3, switch S6, switch S8The state of disconnection；
-V7-2：Switch S1, switch S4, switch S7Closure, switchs S2, switch S3, switch S5, switch S6, switch S8The state of disconnection；
-V7-3：Switch S1, switch S3, switch S4, switch S7Closure, switchs S2, switch S5, switch S6, switch S8The state of disconnection；
-V6：Switch S2, switch S3, switch S5, switch S7Closure, switchs S1, switch S4, switch S6, switch S8The state of disconnection；
-V5-1：Switch S2, switch S4, switch S5, switch S7Closure, switchs S1, switch S3, switch S6, switch S8The state of disconnection；
-V5-2：Switch S2, switch S4, switch S7Closure, switchs S1, switch S3, switch S5, switch S6, switch S8The state of disconnection；
-V5-3：Switch S2, switch S3, switch S4, switch S7Closure, switchs S1, switch S5, switch S6, switch S8The state of disconnection；
-V4-1：Switch S1, switch S3, switch S6, switch S8Closure, switchs S2, switch S4, switch S5, switch S7The state of disconnection；
-V4-2：Switch S1, switch S3, switch S6Closure, switchs S2, switch S4, switch S5, switch S7, switch S8The state of disconnection；
-V4-3：Switch S1, switch S3, switch S4, switch S6Closure, switchs S2, switch S5, switch S7, switch S8The state of disconnection；
-V3：Switch S1, switch S4, switch S6, switch S8Closure, switchs S2, switch S3, switch S5, switch S7The state of disconnection；
-V2-1：Switch S2, switch S3, switch S6, switch S8Closure, switchs S1, switch S4, switch S5, switch S7The state of disconnection；
-V2-2：Switch S2, switch S3, switch S6Closure, switchs S1, switch S4, switch S5, switch S7, switch S8The state of disconnection；
-V2-3：Switch S2, switch S3, switch S4, switch S6Closure, switchs S1, switch S5, switch S7, switch S8The state of disconnection；
-V1：Switch S2, switch S4, switch S6, switch S8Closure, switchs S1, switch S3, switch S5, switch S7The state of disconnection；
10 kinds of intermediatenesses are respectively：
-VM0：Switch S1, switch S3, switch S4Closure, switchs S2, switch S5, switch S7, switch S6, switch S8The state of disconnection；
-VM1：Switch S3, switch S5, switch S7Closure, switchs S1, switch S2, switch S4, switch S6, switch S8The state of disconnection；
-VM2：Switch S1, switch S5, switch S7Closure, switchs S2, switch S3, switch S4, switch S6, switch S8The state of disconnection；
-VM3：Switch S2, switch S5, switch S7Closure, switchs S1, switch S3, switch S4, switch S6, switch S8The state of disconnection；
-VM4：Switch S4, switch S5, switch S7Closure, switchs S1, switch S2, switch S3, switch S6, switch S8The state of disconnection；
-VM5：Switch S2, switch S3, switch S4Closure, switchs S1, switch S5, switch S6, switch S7, switch S8The state of disconnection；
-VM6：Switch S3, switch S6, switch S8Closure, switchs S1, switch S2, switch S4, switch S5, switch S7The state of disconnection；
-VM7：Switch S2, switch S6, switch S8Closure, switchs S1, switch S3, switch S4, switch S5, switch S7The state of disconnection；
-VM8：Switch S4, switch S6, switch S8Closure, switchs S1, switch S2, switch S3, switch S5, switch S7The state of disconnection；
-VM9：Switch S1, switch S6, switch S8Closure, switchs S2, switch S3, switch S4, switch S5, switch S7The state of disconnection.
5. the modulator approach according to claim 4 suitable for active neutral point clamp Five-level converter, it is characterised 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。
6. the modulator approach according to claim 4 suitable for active neutral point clamp Five-level converter, it is characterised in that
In step s2, the setting value is a quarter of busbar voltage.
7. the modulator approach according to claim 4 suitable for active neutral point clamp Five-level converter, it is characterised in that
In step s2, the corresponding circuit state of state of the electric capacity charging is following any：
- circuit output current is more than V2-1, V2-2, V2-3, V7-1, V7-2 or V7-3 state when zero；
- circuit output current is less than V3 or V6 states when zero；
The corresponding circuit state of state of the electric capacity electric discharge is following any：
- circuit output current is more than V3 or V6 states when zero；
- circuit output current is less than V2-1, V2-2, V2-3, V7-1, V7-2 or V7-3 state when zero.
8. the modulator approach according to claim 4 suitable for active neutral point clamp Five-level converter, it is characterised in that
The state machine includes：The 16 kind on off states consistent with circuit state and 10 kinds of intermediatenesses；Wherein：
The annexation of 16 kinds of on off states and 10 kinds of intermediatenesses is：VM8Between V3 and V1, and two-way changeable set
Put；VM9Between V3 and V4-1, and two-way changeable setting；VM7Between V2-1 and V1, and two-way changeable setting；
VM6Between V2-1 and V4-1, and two-way changeable setting；VM4Between V5-1 and V7-1, and two-way changeable setting；
VM3Between V5-1 and V6, and two-way changeable setting；VM2Between V7-1 and V8, and two-way changeable setting；VM1Position
Between V6 and V8, and two-way changeable setting；V4-2、V4-3、VM0, V7-3, V7-2 respectively be located between V4-1 and V7-1, and
From V4-1 to V7-1, single-phase switching successively is set；V5-2、V5-3、VM5, V2-3, V2-2 respectively be located between V5-1 and V2-1, and
From V5-1 to V2-1, single-phase switching successively is set.
9. the modulator approach according to claim 8 suitable for active neutral point clamp Five-level converter, it is characterised in that
The state machine also 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 state
Voltage sine wave is distributed equally machine in a cycle, to balance the difference being lost between each main switch；
- state machine is controlled to the drive signal of main switch so that under each circuit state that commutation course undergoes, respectively
The voltage stress of individual main switch is below a quarter of busbar voltage.
10. the modulator approach according to claim 9 suitable for active neutral point clamp Five-level converter, its feature exists
In：Eight main switches close to dc bus are operated in power frequency, and four main switches close to striding capacitance are operated in carrier wave
Frequency.
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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 |
| CN111245271A (en) * | 2020-01-18 | 2020-06-05 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） | H-bridge five-level active neutral point clamped inverter and dead zone effect suppression method |
| CN112688583A (en) * | 2020-12-15 | 2021-04-20 | 西安奇点能源技术有限公司 | Three-level PWM signal implementation method |
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| CN109510493A (en) * | 2018-11-28 | 2019-03-22 | 上海交通大学 | A kind of modulator approach suitable for Five-level converter |
| CN109510493B (en) * | 2018-11-28 | 2020-01-07 | 上海交通大学 | Modulation method suitable for five-level converter |
| CN109462327A (en) * | 2018-12-10 | 2019-03-12 | 上海交通大学 | For Five-level converter exchange side charging soft starting circuit and method |
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| CN111245271B (en) * | 2020-01-18 | 2021-06-11 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） | H-bridge five-level active neutral point clamped inverter and dead zone effect suppression method |
| CN112688583A (en) * | 2020-12-15 | 2021-04-20 | 西安奇点能源技术有限公司 | Three-level PWM signal implementation method |
| 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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