CN110365046A - A kind of three-level inverter driving device - Google Patents
A kind of three-level inverter driving device Download PDFInfo
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- CN110365046A CN110365046A CN201910641109.6A CN201910641109A CN110365046A CN 110365046 A CN110365046 A CN 110365046A CN 201910641109 A CN201910641109 A CN 201910641109A CN 110365046 A CN110365046 A CN 110365046A
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- 230000007613 environmental effect Effects 0.000 claims description 15
- 238000001514 detection method Methods 0.000 claims description 7
- 230000005611 electricity Effects 0.000 claims description 2
- 230000002093 peripheral effect Effects 0.000 abstract description 14
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Classifications
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- H02J3/383—
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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
- H02M7/53—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
Abstract
This application discloses a kind of three-level inverter driving devices, it include: main control unit, for obtaining three-phase AC grid information, and according to three-phase AC grid information obtain respectively corresponding three control signal groups of three-phase, each control signal group includes first control signal and second control signal；Driving unit, for obtaining three control signal groups simultaneously, and corresponding three driving signal groups are generated according to three control signal groups, the first driving signal, the second driving signal, third driving signal and the fourth drive signal in each driving signal group are applied separately to simultaneously on four switching tubes in the topological structure of corresponding phase, so that the virtual condition of the topological structure is corresponding dbjective state.Main control unit only needs 6 PWM peripheral ports to connect with driving unit in the application, and it is more to solve the problems, such as that three-level inverter occupies main control chip PWM peripheral resources quantity, reduces the design difficulty and hardware cost of three-level inverter.
Description
Technical field
The present invention relates to power electronic equipment field, in particular to a kind of three-level inverter driving device.
Background technique
With the fast development of distributed photovoltaic power generation technology, photovoltaic DC-to-AC converter is from two Level Technologies to more level skills
Art direction is developed, wherein the inverter of three Level Technologies is widely applied.In the application of traditional two-level inverter, in order to
Complete the inversion function of three-phase inverter, it usually needs the drive of power device is realized using 6 PWM peripheral ports of control chip
It is dynamic, and 12 PWM peripheral ports of control chip then to be used to realize in three-level inverter, outside Project design is to PWM
If resource requirement is higher, design difficulty and cost of hardware design are higher.
Therefore, how to provide a kind of scheme of solution above-mentioned technical problem is that current those skilled in the art need to solve
Problem.
Summary of the invention
In view of this, that the purpose of the present invention is to provide a kind of peripheral port demands is less, lower three electricity of hardware cost
Flat inverter driving apparatus.Its concrete scheme is as follows:
A kind of three-level inverter driving device, comprising:
Main control unit is distinguished for obtaining three-phase AC grid information, and according to the three-phase AC grid information
Three control signal groups of corresponding three-phase, wherein each control signal group corresponds to the topological structure for corresponding to phase in inverter
A dbjective state, each control signal group includes first control signal and second control signal, the target-like
State specifically includes P-state, N-state and 0 state that can mutually convert with the P-state, the N-state；
Driving unit is used for while obtaining three control signal groups, and generated according to three control signal groups
Corresponding three driving signal groups, while by the first driving signal, the second driving signal, in each driving signal group
Three driving signals and fourth drive signal are applied separately to four switching tubes in the topological structure for corresponding to phase in the inverter
On, so that the virtual condition of the topological structure is the corresponding dbjective state.
Preferably, the three-level inverter driving device further include:
Fault detection unit for obtaining environmental information and/or electric information, and judges the environmental information and/or institute
State whether electric information exceeds corresponding preset range, if so, output fault pre-alarming；
Correspondingly, the driving unit is also used to the corresponding driving signal group zero setting according to the fault pre-alarming.
Preferably, the environmental information includes temperature information and/or humidity information；
The electric information includes the three-phase AC grid information and/or DC bus information；
The fault pre-alarming includes temperature pre-warning, humidity early warning, overcurrent early warning and/or overvoltage early warning.
Preferably, the fault detection unit is specifically used for: obtaining environmental information and/or electric information, and described in judgement
Whether environmental information and/or the electric information reach the fault coverage of a certain grade, if so, output fault level early warning；
Correspondingly, the driving unit is specifically used for according to the fault level early warning, by the corresponding driving signal
Group zero setting.
Preferably, the driving unit is also used to:
Any phase of the inverter the topological structure virtual condition the P-state and 0 state it
Between when converting, First Transition driving signal group is generated, so that the First Transition state of the corresponding First Transition driving signal group
Switch transition of the virtual condition between the P-state and 0 state as the topological structure；
Any phase of the inverter the topological structure virtual condition the N-state and 0 state it
Between when converting, the second transition driving signal group is generated, so that the second transition state of the corresponding second transition driving signal group
Switch transition of the virtual condition between the N-state and 0 state as the topological structure.
Preferably, the dbjective state further includes that can mutually convert with 0 state, can be exchanged into the First Transition shape
State, the R state that can be exchanged into second transition state.
Preferably, the first driving signal described in the corresponding driving signal group of the P-state, the second driving letter
Number, the third driving signal and the fourth drive signal be followed successively by 1100；
It is first driving signal described in the corresponding driving signal group of 0 state, second driving signal, described
Third driving signal and the fourth drive signal are followed successively by 0110；
It is first driving signal described in the corresponding driving signal group of the N-state, second driving signal, described
Third driving signal and the fourth drive signal are followed successively by 0011；
First driving signal, described described in the corresponding First Transition driving signal group of the First Transition state
Two driving signal, the third driving signal and the fourth drive signal are followed successively by 0100；
First driving signal, described described in the corresponding second transition driving signal group of second transition state
Two driving signal, the third driving signal and the fourth drive signal are followed successively by 0010；
It is first driving signal described in the corresponding driving signal group of the R state, second driving signal, described
Third driving signal and the fourth drive signal are followed successively by 0000.
Preferably, the first control signal in the control signal group of the corresponding P-state and second control
Signal processed is followed successively by 10；
The first control signal and the second control signal in the control signal group of the corresponding N-state according to
Secondary is 01；
The first control signal and the second control signal in the control signal group of corresponding 0 state according to
Secondary is 00；
The first control signal and the second control signal in the control signal group of the corresponding R state according to
Secondary is 11.
Preferably, the topological structure is specially I type three-level topology structure or T-type three-level topology structure.
This application discloses a kind of three-level inverter driving devices, comprising: main control unit, for obtaining three-phase alternating current
Net information, and according to the three-phase AC grid information obtain respectively corresponding three control signal groups of three-phase, wherein each institute
The dbjective state that control signal group corresponds to the topological structure that phase is corresponded in inverter is stated, each control signal group is equal
Including first control signal and second control signal, the dbjective state specifically include P-state, N-state and with the P shape
0 state that state, the N-state can be converted mutually；Driving unit is used for while obtaining three control signal groups, and root
Corresponding three driving signal groups are generated according to three control signal groups, while by first in each driving signal group
Driving signal, the second driving signal, third driving signal and fourth drive signal are applied separately to correspond to phase in the inverter
Topological structure in four switching tubes on so that the virtual condition of the topological structure be the corresponding dbjective state.This Shen
Please in two of signal group control signals of each control correspond to four driving signals of each driving signal group, main control unit only needs
It wants 6 PWM peripheral ports to connect with driving unit, solves three-level inverter and main control chip PWM peripheral resources quantity is accounted for
With more problem, the design difficulty and hardware cost of three-level inverter are reduced.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is a kind of structure distribution figure of three-level inverter driving device in the embodiment of the present invention；
Fig. 2 a is the structure distribution figure of I type three-level topology structure in the embodiment of the present invention；
Fig. 2 b is the structure distribution figure of T-type three-level topology structure in the embodiment of the present invention；
Fig. 3 is a kind of logical schematic of dbjective state conversion in the embodiment of the present invention；
Fig. 4 is the structure distribution figure of another three-level inverter driving device in the embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The driving of power device in three-level inverter, 12 PWM peripheral ports realization of usually used control chip, when
When Project design is more demanding to PWM peripheral resources, design difficulty and cost of hardware design are higher.And each control in the application
Two control signals of signal group correspond to four driving signals of each driving signal group, and main control unit only needs 6 PWM peripheral hardwares
Port is connect with driving unit, and it is more to solve the problems, such as that three-level inverter occupies main control chip PWM peripheral resources quantity,
Reduce the design difficulty and hardware cost of three-level inverter.
It is shown in Figure 1 the embodiment of the invention discloses a kind of three-level inverter driving device, comprising:
Main control unit 1 is distinguished for obtaining three-phase AC grid information, and according to the three-phase AC grid information
Three control signal groups of corresponding three-phase, wherein each control signal group corresponds to the topological structure for corresponding to phase in inverter
A dbjective state, each control signal group includes first control signal and second control signal, the target-like
State specifically includes P-state, N-state and 0 state that can mutually convert with the P-state, the N-state；
Driving unit 2 is used for while obtaining three control signal groups, and generated according to three control signal groups
Corresponding three driving signal groups, while by the first driving signal, the second driving signal, in each driving signal group
Three driving signals and fourth drive signal are applied separately to four switching tubes in the topological structure for corresponding to phase in the inverter
On, so that the virtual condition of the topological structure is the corresponding dbjective state.
Wherein, main control unit 1 is specifically chosen DSP (digital signal processing, digital signal processor) and makees
For Master control chip, CPLD then may be selected in driving unit 2, and (Complex Programmable Logic Device is responsible for compile
Journey logical device) or FPGA (Field Programmable Gate Array, field programmable gate array).
Specifically, main control unit 1 obtain three-phase AC grid information include three-phase power grid voltage VGridA, VGridB,
VGridC and three-phase grid electric current IGridA, IGridB, IGridC, are coordinately transformed three-phase AC grid information and are revolved
Turn the DC control component under coordinate system, then obtains the two control signals namely master control list of each phase by control algolithm
Member output three control signal groups in first control signals and second control signal include: SA1, SA2, SB1, SB2, SC1,
SC2, commonly using state during the work time due to each topological structure of inverter includes P-state, N-state and 0 state, by this
For three common states as dbjective state, these three states correspond to the switch state that four switching tubes determine on topological structure,
And the low and high levels combination of two control signals will mention in corresponding the present embodiment enough there are four types of situation in a control signal group
To all dbjective states, therefore first control signal and second control signal can show finally to apply to driving unit 2
To the dbjective state of topological structure, that is to say, that main control unit 1 needs 6 PWM peripheral ports to connect driving unit 2
Realize the present embodiment.
It is understood that driving unit 2 obtains three control signal groups simultaneously, and three driving signals are exported simultaneously
Group guarantees that the signal of three-phase synchronizes no time difference always；Distribution logic is driven in 2 storage inside of driving unit, wherein really
The corresponding relationship determined each dbjective state, controlled signal group signal numerical value, driving signal group signal numerical value, 2 energy of driving unit
Enough according to first control signal and second control signal in each control signal group, it is four corresponding to obtain corresponding dbjective state
Signal is controlled, then this four control signals are applied separately on the switching tube of corresponding phase topological structure, it is to be understood that
Driving unit 2 export driving signal totally ten two, corresponding A, B, C three-phase, be respectively as follows: S-TA1, S-TA2, S-TA3, S-TA4,
S-TB1、S-TB2、S-TB3、S-TB4、S-TC1、S-TC2、S-TC3、S-TC4。
Specifically, controlling the first control signal and second control signal, driving signal group of signal group in the present embodiment
First driving signal, the second driving signal, third driving signal and fourth drive signal are the form of pwm pulse signal.
In the present embodiment, the topological structure of three-level inverter be specially I type three-level topology structure shown in Fig. 2 a or
The topology of T-type three-level structure shown in Fig. 2 b.Using the midpoint of capacitor C1 and C2 as reference voltage, when switch transistor T 1 and T2 conducting
For P-state, inverter output voltage Vbus/2 is 0 state when switch transistor T 2 and T3 conducting, inverter output voltage 0,
It is N-state when switch transistor T 3 and T4 are connected, inverter output voltage is-Vbus/2, and specific switching tube state and inverter are defeated
Level relationship is as shown in table 1 out.
1 tri-level switch tubulose state of table and output level relationship
| Inverter output level | T1 | T2 | T3 | T4 |
| 1 level | 1 | 1 | 0 | 0 |
| 0 level | 0 | 1 | 1 | 0 |
| - 1 level | 0 | 0 | 1 | 1 |
This application discloses a kind of three-level inverter driving devices, comprising: main control unit, for obtaining three-phase alternating current
Net information, and according to the three-phase AC grid information obtain respectively corresponding three control signal groups of three-phase, wherein each institute
The dbjective state that control signal group corresponds to the topological structure that phase is corresponded in inverter is stated, each control signal group is equal
Including first control signal and second control signal, the dbjective state specifically include P-state, N-state and with the P shape
0 state that state, the N-state can be converted mutually；Driving unit is used for while obtaining three control signal groups, and root
Corresponding three driving signal groups are generated according to three control signal groups, while by first in each driving signal group
Driving signal, the second driving signal, third driving signal and fourth drive signal are applied separately to correspond to phase in the inverter
Topological structure in four switching tubes on so that the virtual condition of the topological structure be the corresponding dbjective state.This Shen
Please in two of signal group control signals of each control correspond to four driving signals of each driving signal group, main control unit only needs
It wants 6 PWM peripheral ports to connect with driving unit, solves three-level inverter and main control chip PWM peripheral resources quantity is accounted for
With more problem, the design difficulty and hardware cost of three-level inverter are reduced.
The embodiment of the invention discloses a kind of specific three-level inverter driving devices, relative to a upper embodiment, originally
Embodiment has made further instruction and optimization to technical solution.
Specific reference to shown in Fig. 3, the driving unit 2 is also used to:
Any phase of the inverter the topological structure virtual condition the P-state and 0 state it
Between when converting, First Transition driving signal group is generated, so that the First Transition state of the corresponding First Transition driving signal group
Switch transition of the virtual condition between the P-state and 0 state as the topological structure；
Any phase of the inverter the topological structure virtual condition the N-state and 0 state it
Between when converting, the second transition driving signal group is generated, so that the second transition state of the corresponding second transition driving signal group
Switch transition of the virtual condition between the N-state and 0 state as the topological structure.
Wherein, First Transition state (referred to as X state) and the second transition state (referred to as Y state) are also known as dead zone shape
State is when protecting more demanding, the output of main control unit 1 control signal to correspond to R state such as device in some special circumstances two
Driving unit 2 actively applies driving signal realization when needing to buffer transition between a virtual condition.
That is, the dbjective state further includes that can mutually convert with 0 state, can be exchanged into the First Transition
State, the R state that can be exchanged into second transition state.The judgement of this state is still completed by driving unit 2, and master control is worked as
Unit 1 exported to driving unit 2 control signal group in normal operating conditions P-state, N-state or 0 state it is not corresponding,
The control signal group that then main control unit 1 exports at this time is abnormal, and main control unit 1 is abnormal operating state.
Specifically, see below shown in table 2, to all dbjective states, control signal, driving signal numerical value determine into
Row illustrates, comprising:
It is first driving signal described in the corresponding driving signal group of the P-state, second driving signal, described
Third driving signal and the fourth drive signal are followed successively by 1100；
It is first driving signal described in the corresponding driving signal group of 0 state, second driving signal, described
Third driving signal and the fourth drive signal are followed successively by 0110；
It is first driving signal described in the corresponding driving signal group of the N-state, second driving signal, described
Third driving signal and the fourth drive signal are followed successively by 0011；
First driving signal, described described in the corresponding First Transition driving signal group of the First Transition state
Two driving signal, the third driving signal and the fourth drive signal are followed successively by 0100；
First driving signal, described described in the corresponding second transition driving signal group of second transition state
Two driving signal, the third driving signal and the fourth drive signal are followed successively by 0010；
It is first driving signal described in the corresponding driving signal group of the R state, second driving signal, described
Third driving signal and the fourth drive signal are followed successively by 0000.
Correspondingly, the first control signal and second control in the control signal group of the corresponding P-state
Signal processed is followed successively by 10；
The first control signal and the second control signal in the control signal group of the corresponding N-state according to
Secondary is 01；
The first control signal and the second control signal in the control signal group of corresponding 0 state according to
Secondary is 00；
The first control signal and the second control signal in the control signal group of the corresponding R state according to
Secondary is 11.
It is however noted that control signal and the corresponding relationship of dbjective state can also have other schemes, because this
In four kinds of dbjective states (P-state, N-state, 0 state, R state) and four kinds of control signals (00,01,10,11) not about
Beam limits, as long as corresponding, such as 0 state corresponds to three that 11, R state corresponding 00 is similarly applied in the present embodiment
It is one kind for example, and non-determined to the description of corresponding relationship in electrical level inverter driving device, the present embodiment and table 2
There is a kind of this scheme.
The driving distribution logic of table 2
| Dbjective state | Control signal | Driving signal |
| P-state | 10 | 1100 |
| N-state | 01 | 0011 |
| 0 state | 00 | 0110 |
| R state | 11 | 0000 |
By taking table 2 as an example, when a certain control signal group that driving unit 2 judges that main control unit 1 is sent corresponds to dbjective state
For R state, then each driving signal is followed successively by 0000 in output drive signal group, with protective switch device.With reference to Fig. 3, according to inverse
Become the operation characteristic of device, when invertor operation is in power grid positive half period, it is only P that main control unit 1, which exports corresponding dbjective state,
State and 0 state, driving unit 2 can be added First Transition state when P-state and 0 state are converted, distinguishingly, work as main control unit
When R state occurs in the corresponding dbjective state of 1 output, First Transition state can be added when converting to P-state in R state.Equally, when inverse
When change device operates in power grid negative half-cycle, the dbjective state of main control unit output is only N-state and 0 state, and driving unit 2 is in N
The second transition state can be added when converting in state and 0 state, distinguishingly, R occur when main control unit 1 exports corresponding dbjective state
When state, the second transition state can be added when converting to N-state in R state.
The embodiment of the invention discloses a kind of specific three-level inverter driving devices, relative to a upper embodiment, originally
Embodiment has made further instruction and optimization to technical solution.
Specifically, shown in Figure 4, the three-level inverter driving device further include:
Fault detection unit 3 for obtaining environmental information and/or electric information, and judges the environmental information and/or institute
State whether electric information exceeds corresponding preset range, if so, output fault pre-alarming；
Correspondingly, the driving unit 2 is also used to the corresponding driving signal group zero setting according to the fault pre-alarming.
Wherein, the environmental information includes temperature information and/or humidity information；
The electric information includes the three-phase AC grid information and/or DC bus information；
The fault pre-alarming includes temperature pre-warning, humidity early warning, overcurrent early warning and/or overvoltage early warning.
Specifically, temperature information Temperature and humidity information Humidity are mainly for inverter upper topology here
The environment temperature near each switching tube in structure, ambient humidity；Three-phase AC grid information needed for fault pre-alarming judgement
Generally current information IGridA, IGridB, IGridC, DC bus information are generally busbar voltage Vbus.
Further, the fault detection unit 3 is specifically used for: obtaining environmental information and/or electric information, and judges institute
It states environmental information and/or whether the electric information reaches the fault coverage of a certain grade, if so, output fault level is pre-
It is alert；
Correspondingly, the driving unit 2 is specifically used for according to the fault level early warning, by the corresponding driving signal
Group zero setting.
It is understood that the fault protection logic in the present embodiment can be single solution for diverse problems, to institute if breaking down
There is the envelope wave zero setting of driving signal group to protect inverter, can also be taken different degrees of according to different fault level early warning
Measure selects a part of driving signal group zero setting.
In the design of photovoltaic DC-to-AC converter, perfect defencive function plays a significant role the reliability service of system.Tradition
Inverter hardware protection circuit be usually designed by devices such as integrated circuit, comparator, resistance capacitances, realize defencive function
The number of elements used is more, and design is more complex, and it is big that PCB is laid out difficulty.And the present embodiment joined in driving device and pass through
The fail-safe design that driving unit 2 and fault detection unit 3 are realized, improves failure response speed, reduces equipment damage
Risk.
Finally, it is to be noted that, herein, relational terms such as first and second and the like be used merely to by
One entity or operation are distinguished with another entity or operation, without necessarily requiring or implying these entities or operation
Between there are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant meaning
Covering non-exclusive inclusion, so that the process, method, article or equipment for including a series of elements not only includes that
A little elements, but also including other elements that are not explicitly listed, or further include for this process, method, article or
The intrinsic element of equipment.In the absence of more restrictions, the element limited by sentence "including a ...", is not arranged
Except there is also other identical elements in the process, method, article or apparatus that includes the element.
A kind of three-level inverter driving device provided by the present invention is described in detail above, it is used herein
A specific example illustrates the principle and implementation of the invention, and the above embodiments are only used to help understand
Method and its core concept of the invention；At the same time, for those skilled in the art is having according to the thought of the present invention
There will be changes in body embodiment and application range, in conclusion the content of the present specification should not be construed as to the present invention
Limitation.
Claims (9)
1. a kind of three-level inverter driving device characterized by comprising
Main control unit is respectively corresponded for obtaining three-phase AC grid information, and according to the three-phase AC grid information
Three control signal groups of three-phase, wherein each control signal group corresponds to the one of the topological structure for corresponding to phase in inverter
A dbjective state, each control signal group include first control signal and second control signal, the dbjective state tool
Body includes P-state, N-state and 0 state that can mutually convert with the P-state, the N-state；
Driving unit is used for while obtaining three control signal groups, and generated accordingly according to three control signal groups
Three driving signal groups, while by each driving signal group the first driving signal, the second driving signal, third drive
Dynamic signal and fourth drive signal are applied separately on four switching tubes in the topological structure for corresponding to phase in the inverter, with
Make the corresponding dbjective state of the virtual condition of the topological structure.
2. three-level inverter driving device according to claim 1, which is characterized in that further include:
Fault detection unit for obtaining environmental information and/or electric information, and judges the environmental information and/or the electricity
Whether gas information exceeds corresponding preset range, if so, output fault pre-alarming；
Correspondingly, the driving unit is also used to the corresponding driving signal group zero setting according to the fault pre-alarming.
3. three-level inverter driving device according to claim 2, which is characterized in that
The environmental information includes temperature information and/or humidity information；
The electric information includes the three-phase AC grid information and/or DC bus information；
The fault pre-alarming includes temperature pre-warning, humidity early warning, overcurrent early warning and/or overvoltage early warning.
4. three-level inverter driving device according to claim 3, which is characterized in that the fault detection unit is specifically used
In: environmental information and/or electric information are obtained, and judges whether the environmental information and/or the electric information reach a certain
The fault coverage of grade, if so, output fault level early warning；
Correspondingly, the driving unit is specifically used for being set the corresponding driving signal group according to the fault level early warning
Zero.
5. according to claim 1 to any one of 4 three-level inverter driving devices, which is characterized in that the driving unit
It is also used to:
Turn between the P-state and 0 state in the virtual condition of the topological structure of any phase of the inverter
When changing, First Transition driving signal group is generated, so that the First Transition state conduct of the corresponding First Transition driving signal group
Switch transition of the virtual condition of the topological structure between the P-state and 0 state；
Turn between the N-state and 0 state in the virtual condition of the topological structure of any phase of the inverter
When changing, the second transition driving signal group is generated, so that the second transition state conduct of the corresponding second transition driving signal group
Switch transition of the virtual condition of the topological structure between the N-state and 0 state.
6. three-level inverter driving device according to claim 5, which is characterized in that the dbjective state further includes can be with
The R state that 0 state is mutually converted, can be exchanged into the First Transition state, can be exchanged into second transition state.
7. three-level inverter driving device according to claim 6, which is characterized in that
First driving signal, second driving signal, the third described in the corresponding driving signal group of the P-state
Driving signal and the fourth drive signal are followed successively by 1100；
First driving signal, second driving signal, the third described in the corresponding driving signal group of 0 state
Driving signal and the fourth drive signal are followed successively by 0110；
First driving signal, second driving signal, the third described in the corresponding driving signal group of the N-state
Driving signal and the fourth drive signal are followed successively by 0011；
First driving signal described in the corresponding First Transition driving signal group of the First Transition state, described second drive
Dynamic signal, the third driving signal and the fourth drive signal are followed successively by 0100；
First driving signal described in the corresponding second transition driving signal group of second transition state, described second drive
Dynamic signal, the third driving signal and the fourth drive signal are followed successively by 0010；
First driving signal, second driving signal, the third described in the corresponding driving signal group of the R state
Driving signal and the fourth drive signal are followed successively by 0000.
8. three-level inverter driving device according to claim 7, which is characterized in that
The first control signal and the second control signal in the control signal group of the corresponding P-state are followed successively by
10；
The first control signal and the second control signal in the control signal group of the corresponding N-state are followed successively by
01；
The first control signal and the second control signal in the control signal group of corresponding 0 state are followed successively by
00；
The first control signal and the second control signal in the control signal group of the corresponding R state are followed successively by
11。
9. three-level inverter driving device according to claim 8, which is characterized in that the topological structure is specially I type
Three-level topology structure or T-type three-level topology structure.
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