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 PDF

Info

Publication number
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
Authority
CN
China
Prior art keywords
main switch
state
switch
closure
main
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201710400923.XA
Other languages
Chinese (zh)
Other versions
CN107276442A (en
Inventor
李睿
杨佳涛
杨思嘉
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shanghai Jiaotong University
Original Assignee
Shanghai Jiaotong University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shanghai Jiaotong University filed Critical Shanghai Jiaotong University
Priority to CN201710400923.XA priority Critical patent/CN107276442B/en
Publication of CN107276442A publication Critical patent/CN107276442A/en
Application granted granted Critical
Publication of CN107276442B publication Critical patent/CN107276442B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M7/00Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48Conversion 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
    • H02M7/483Converters with outputs that each can have more than two voltages levels
    • H02M7/487Neutral point clamped inverters
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M7/00Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48Conversion 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
    • H02M7/53Conversion 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
    • H02M7/537Conversion 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
    • H02M7/539Conversion 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
    • H02M7/5395Conversion 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

Landscapes

  • Engineering & Computer Science (AREA)
  • 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

Modulator approach suitable for active neutral point clamp Five-level converter
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.
CN201710400923.XA 2017-05-31 2017-05-31 Modulator approach suitable for active neutral point clamp Five-level converter Active CN107276442B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201710400923.XA CN107276442B (en) 2017-05-31 2017-05-31 Modulator approach suitable for active neutral point clamp Five-level converter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201710400923.XA CN107276442B (en) 2017-05-31 2017-05-31 Modulator approach suitable for active neutral point clamp Five-level converter

Publications (2)

Publication Number Publication Date
CN107276442A CN107276442A (en) 2017-10-20
CN107276442B true CN107276442B (en) 2019-07-05

Family

ID=60064397

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201710400923.XA Active CN107276442B (en) 2017-05-31 2017-05-31 Modulator approach suitable for active neutral point clamp Five-level converter

Country Status (1)

Country Link
CN (1) CN107276442B (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
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
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
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

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016015848A (en) * 2014-07-03 2016-01-28 株式会社明電舎 Five level power conversion device
CN106100430A (en) * 2016-08-23 2016-11-09 合肥工业大学 The carrier wave implementation method of three-phase five-level inverter low common-mode voltage modulation

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016015848A (en) * 2014-07-03 2016-01-28 株式会社明電舎 Five level power conversion device
CN106100430A (en) * 2016-08-23 2016-11-09 合肥工业大学 The carrier wave implementation method of three-phase five-level inverter low common-mode voltage modulation

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
多电平有源中点箝位型变换器控制策略研究;司夏河;《中国优秀硕士学位论文全文数据库工程科技Ⅱ辑》;20160715(第7期);第21页第3.1节-第30页第3.2.1节、第45-46页第4.1.1节,附图3-1、3-3、3-4、4-1

Also Published As

Publication number Publication date
CN107276442A (en) 2017-10-20

Similar Documents

Publication Publication Date Title
CN107276442B (en) Modulator approach suitable for active neutral point clamp Five-level converter
EP3082212B1 (en) Tripolar flexible direct-current power transmission system and method
CN104702114B (en) High-frequency-chain bidirectional direct-current transformer with switched capacitor access and control method thereof
CN106253728B (en) Multi-port modular multi-level converter for Multi-end flexible direct current transmission application
CN102005954B (en) Single-phase non-isolated photovoltaic grid-connected inverter and control method
CN104410260A (en) Fault-tolerance-capability-equipped MMC sub-module structure capable of realizing DC fault self-protection, and MMC modulation method thereof
CN103236800A (en) Novel topological structure voltage source type inverter and adjusting method
CN108418455B (en) A kind of control method of multi-electrical level inverter, device and inverter
CN104079184A (en) Wind power converter based on bipolar direct-current structure
CN103997033A (en) High-voltage direct-current transmission system with direct-current fault ride-through capacity
CN105978376A (en) Grid-connected inverter circuit and control method thereof
CN107370392A (en) Towards the electric power electric transformer of mesohigh intelligent distribution network
CN107370391A (en) Bridge arm towards mesohigh intelligent distribution network is multiplexed electric power electric transformer
CN102545675B (en) Hybrid series H-bridge multi-level grid-connected inverter direct current bus voltage control method
CN105305843A (en) Three-phase series half H-bridge modular multilevel DC converter and control method thereof
CN107834602A (en) A kind of micro- source half-bridge current transformer tandem type micro-grid system
CN102608468A (en) Testing system for detecting characteristics of offshore wind power flexible direct current transmission converter
CN101895222B (en) Multi-carrier wave TPWM modulation method based on reverse-phase cross
CN107769598A (en) A kind of new Two-port netwerk half-bridge full-bridge mixing submodule MMC topologys
CN201726334U (en) Photovoltaic grid-connected inverter
CN105978375B (en) Chiasma type submodule and its MMC control methods suitable for the transmission of electricity of remote large capacity overhead line
CN107196547A (en) A kind of symmetrical complete period modulator approach of the double buck combining inverters of three-phase
CN103762881B (en) Single-phase three switches set MMC inverter and the control methods thereof of dual output
CN108173447B (en) Distribution network level high-frequency isolation type flexible direct current converter
CN207053406U (en) A kind of electric power electric transformer of tandem mesohigh power network

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant