CN113872460A - Switching modulation method for inverter and ANPC type three-level inverter circuit - Google Patents
Switching modulation method for inverter and ANPC type three-level inverter circuit Download PDFInfo
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- CN113872460A CN113872460A CN202111305902.2A CN202111305902A CN113872460A CN 113872460 A CN113872460 A CN 113872460A CN 202111305902 A CN202111305902 A CN 202111305902A CN 113872460 A CN113872460 A CN 113872460A
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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
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/38—Means for preventing simultaneous conduction of switches
Abstract
The application provides a switching modulation method of an inverter and an ANPC type three-level inverter circuit. In the switching modulation method of the inverter circuit, when the inverter circuit outputs a zero level, a path is not formed between the conducted outer tube and the current path in the inverter circuit, so that zero current turn-off of the outer tube can be realized; in addition, after a double follow current loop is constructed in the inverter circuit, the output level of the inverter circuit cannot be changed by turning off any clamping tube in the inverter circuit, so that zero voltage turn-off of the clamping tube can be realized; in summary, the switching modulation method of the inverter circuit reduces the stress borne by the outer tube and the clamp tube in the output state conversion process, so that the outer tube and the clamp tube can be prevented from generating overpressure in the output state conversion process, the outer tube and the clamp tube can select a switching tube with lower withstand voltage, and the cost of the ANPC type three-level inverter circuit can be reduced.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a switching modulation method of an inverter and an ANPC type three-level inverter circuit.
Background
The ANPC type three-level inverter circuit is shown in fig. 1, wherein the first switching tube T1 and the fourth switching tube T4 are outer tubes, the second switching tube T2 and the third switching tube T3 are inner tubes, and the fifth switching tube T5 and the sixth switching tube T6 are clamp tubes. At present, the modulation strategy of ANPC is more flexible, and the modulation strategy of inner tube high frequency and outer tube power frequency can be adopted.
Although the path of the commutation loop is lengthened, the loss can be reduced, and therefore the modulation strategy is suitable for occasions with low power. Under the normal condition, when the modulation strategy is adopted, the outer tube and the clamping tube are switched only at the zero-crossing point, and the output state of the ANPC type three-level inverter circuit is converted; during switching, the outer tube and the clamp tube may have an overvoltage, and in order to avoid the outer tube and the clamp tube from being damaged by the overvoltage during switching, the outer tube and the clamp tube with higher resistance are usually selected, so that the cost of the ANPC type three-level inverter circuit is increased.
Therefore, how to avoid an outer tube and a clamp tube in the ANPC type three-level inverter circuit, and an overvoltage occurs when the inverter circuit performs output state conversion is a technical problem to be solved urgently.
Disclosure of Invention
In view of this, the present invention provides a switching modulation method for an inverter and an ANPC type three-level inverter circuit, so as to avoid an overvoltage occurring when the output state of the inverter circuit is switched between an outer tube and a clamp tube in the ANPC type three-level inverter circuit.
In order to achieve the above purpose, the embodiments of the present invention provide the following technical solutions:
one aspect of the present application provides a switching modulation method for an ANPC type three-level inverter circuit, including:
when the ANPC type three-level inverter circuit has an output state conversion requirement, judging whether the inverter circuit outputs a zero level;
if the inverter circuit outputs zero level, controlling the corresponding outer tube in the inverter circuit to be switched off;
after a double follow current loop is constructed in the inverter circuit, the inverter circuit is controlled to be converted into a required output state, and a corresponding clamping tube in the inverter circuit is controlled to be turned off;
and controlling the on/off of the corresponding inner tube and the corresponding outer tube in the inverter circuit by taking the aim of controlling the inverter circuit to be converted into the required output state.
Optionally, the ANPC type three-level inverter circuit has an output state conversion requirement, including:
the inverter circuit switches the running half period of the inverter circuit, or the inverter circuit converts the output state of the inverter circuit into a shutdown state, or the inverter circuit converts the output state of the inverter circuit into a fault state; the fault state is the shutdown state or the outer tube shutdown state.
Optionally, when the inverter circuit switches its own operating half cycle, the required output state is an output state when the inverter circuit is in another operating half cycle except the current operating half cycle;
when the inverter circuit converts the output state of the inverter circuit into the shutdown state, the required output state is the shutdown state;
when the inverter circuit converts the output state of the inverter circuit into the outer tube turn-off state, the required output state is the outer tube turn-off state.
Optionally, the current operating half cycle includes: a positive half cycle or a negative half cycle.
Optionally, when the inverter circuit switches its own operating half cycle, the inverter circuit controls the turn-off or turn-on of the corresponding inner tube and the corresponding outer tube, including:
and simultaneously controlling the corresponding inner pipe to be switched off and the corresponding outer pipe to be switched on, or controlling the corresponding outer pipe to be switched on after controlling the corresponding inner pipe to be switched off.
Optionally, the step of controlling the corresponding inner tube to be turned off is advanced, and is executed simultaneously with the step of controlling the corresponding clamping tube to be turned off.
Optionally, after controlling the conduction of the corresponding outer tube, the method further includes:
and controlling all the inner pipes to be turned off.
Optionally, when the inverter circuit converts the output state of the inverter circuit into the shutdown state, the inverter circuit controls turn-off or turn-on of the corresponding inner tube and the corresponding outer tube, including:
and controlling all the inner pipes to be turned off.
Optionally, when the external tube is in the off state, compared with the original output state of the inverter circuit, only the external tube is off.
Optionally, when the inverter circuit converts the output state of the inverter circuit into the outer tube off state, after controlling the corresponding outer tube in the inverter circuit to be turned off, the method further includes:
judging whether the required output state is the off state of the outer tube;
if the demand output state is the off state of the outer tube, executing a step of controlling the on or off of the corresponding inner tube and the corresponding outer tube in the inverter circuit by taking the inverter circuit to be controlled to be converted into the demand output state as a target;
and if the required output state is not the outer tube turn-off state, executing a step of controlling the turn-off of a corresponding clamping tube in the inverter circuit by taking the aim of controlling the inverter circuit to be converted into the required output state after a double follow current loop is constructed in the inverter circuit.
Optionally, if the inverter circuit does not output a zero level, after controlling the inverter circuit to output the zero level in the current output state, the step of controlling the turn-off of the corresponding outer tube in the inverter circuit is returned to.
Optionally, controlling the inverter circuit to output a zero level in a current output state includes:
and after all the inner tubes are controlled to be switched off, constructing a follow current loop in the current output state in the inverter circuit.
Optionally, the execution time difference between two adjacent steps is the maximum of the following times:
dead time in a modulation strategy of the inverter circuit, conducting time of each switching tube in the inverter circuit and turn-off time of each switching tube.
Another aspect of the present application provides an inverter including: the controller, at least one driving unit and at least one ANPC type three-level inverter circuit; wherein:
the direct current side of each ANPC type three-level inverter circuit is connected with a direct current bus of the inverter;
each inverter circuit is controlled by the controller through the corresponding driving unit, and the controller is used for executing the switching modulation method of the ANPC type three-level inverter circuit according to any one of the above aspects of the present application.
Optionally, the ac output terminal of each inverter circuit is used as a phase output terminal of the inverter.
Optionally, the method further includes: at least one DC-DC conversion circuit; wherein:
one end of each direct current-direct current conversion circuit is connected with the direct current bus;
the other end of each direct current-direct current conversion circuit is respectively used as a corresponding port on the direct current side of the inverter;
each direct current-direct current conversion circuit is controlled by the controller through the corresponding driving unit.
Optionally, the controller is an independently arranged controller, or a system controller in a superior system.
According to the technical scheme, the invention provides a switching modulation method of the ANPC type three-level inverter circuit. In the switching modulation method of the ANPC type three-level inverter circuit, when the inverter circuit outputs a zero level, in the inverter circuit, one outer tube is turned on, the other outer tube is turned off, and no path is formed between the turned-on outer tube and the current path, that is: no current flows through the conducted outer tube, so when the inverter circuit has the output state conversion requirement, after the inverter circuit outputs zero level, the corresponding outer tube in the inverter circuit is controlled to be switched off, and the zero current switching off of the outer tube can be realized; in addition, after a double follow current loop is constructed in the inverter circuit, any clamping tube in the inverter circuit is turned off, and the output level of the inverter circuit cannot be changed, so that after the double follow current loop is constructed in the inverter circuit, the corresponding clamping tube is controlled to be turned off, and the zero-voltage turn-off of the clamping tube can be realized; in summary, the switching modulation method of the ANPC type three-level inverter circuit reduces the stress borne by the outer tube and the clamp tube of the inverter circuit in the output state conversion process, so that the outer tube and the clamp tube of the inverter circuit can be prevented from generating overpressure in the output state conversion process, the outer tube and the clamp tube in the inverter circuit can select a switching tube with lower withstand voltage, and the cost of the ANPC type three-level inverter circuit can be reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic diagram of a topology of an ANPC type three-level inverter circuit;
fig. 2 is a schematic flowchart of a switching modulation method of an ANPC type three-level inverter circuit according to an embodiment of the present disclosure;
fig. 3a to fig. 3d are schematic diagrams of current loops when the current output state of the ANPC type three-level inverter circuit is the first output state and current flows under four different conditions, respectively;
fig. 4a to 4d are schematic diagrams of current loops when current flows in four different situations when the current output state of the ANPC type three-level inverter circuit is the first output state;
fig. 5a to 5e are schematic diagrams of current loops when the current output state of the ANPC type three-level inverter circuit is the first output state and the ANPC type three-level inverter circuit switches its own operation half period, respectively, and current flows under five different conditions;
fig. 6a to 6e are schematic diagrams of current loops when current flows in five different situations when the current output state of the ANPC type three-level inverter circuit is the first output state and the ANPC type three-level inverter circuit switches its own operation half cycle;
fig. 7a and 7b are schematic diagrams of current loops when the current output state of the ANPC type three-level inverter circuit is the first output state and the ANPC type three-level inverter circuit converts the output state thereof to the power-off state, respectively, and currents flow out in two different situations;
fig. 8a and 8b are schematic diagrams of current loops when the current output state of the ANPC type three-level inverter circuit is the first output state and the ANPC type three-level inverter circuit converts the output state thereof to the shutdown state, respectively, and current flows in two different situations;
fig. 9a is a schematic diagram of control signals of the switching tubes when the current output state of the ANPC type three-level inverter circuit is the first output state and the ANPC type three-level inverter circuit switches its own operation half period;
fig. 9b is a schematic diagram of control signals of the switching tubes when the current output state of the ANPC type three-level inverter circuit is the first output state and the ANPC type three-level inverter circuit converts the output state thereof to the shutdown state;
fig. 10 is a schematic flowchart of another implementation of a switching modulation method of an ANPC type three-level inverter circuit according to an embodiment of the present disclosure;
fig. 11 is a schematic flowchart of another switching modulation method of an ANPC type three-level inverter circuit according to an embodiment of the present disclosure;
fig. 12 and fig. 13 are two schematic structural diagrams of an inverter provided in an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In this application, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
In order to avoid an external tube and a clamp tube in the ANPC type three-level inverter circuit from generating an overvoltage when the output state of the inverter circuit is converted, an embodiment of the present application provides a switching modulation method of the ANPC type three-level inverter circuit, a specific flow of which is shown in fig. 2, and the method specifically includes the following steps:
s110, when the ANPC type three-level inverter circuit has the output state conversion requirement, whether the ANPC type three-level inverter circuit outputs zero level is judged.
If the ANPC type three-level inverter circuit outputs a zero level, step S120 is performed.
Specifically, the output state of the ANPC type three-level inverter circuit includes: 1) a first output state that operates as an output state during the positive half cycle, namely: outputting high level and zero level alternately in corresponding proportion; 2) a second output state that operates in the output state during the negative half-cycle, namely: outputting low level and zero level alternately in corresponding proportion; 3) the third output state, also called shutdown state, is the output state when it is shutdown, that is: no more levels are output.
Wherein, the state transition requirements are output, namely: the output state of the ANPC type three-level inverter circuit is ready to be converted; in another embodiment of the present application, an implementation manner of the ANPC type three-level inverter circuit having an output state transition requirement may be: the ANPC type three-level inverter circuit switches the running half cycle of the ANPC type three-level inverter circuit, for example, the output state of the ANPC type three-level inverter circuit is ready to be converted from a first output state to a second output state; the following steps can be also included: the ANPC type three-level inverter circuit converts an output state thereof into a shutdown state, for example, the output state of the ANPC type three-level inverter circuit is ready to be converted from a first output state into the shutdown state; the method can also comprise the following steps: the ANPC type three-level inverter circuit converts the output state of the ANPC type three-level inverter circuit into a fault state.
Optionally, the fault state may be a shutdown state, or may also be an outer tube shutdown state, which is not specifically limited herein, and is within the protection scope of the present application according to specific situations. Compared with the original output state of the inverter circuit, the turn-off state of the outer tube is that only all the outer tubes are turned off.
In practical applications, including but not limited to the above embodiments, the two embodiments are not limited to the above embodiments, and may be within the scope of the present application as the case may be.
In another embodiment of the present application, as shown in fig. 9a or fig. 9b, when the received switching command K transitions to a high level, it means that the ANPC type three-level inverter circuit has an output state transition requirement, and the switching command K includes a required output state, which will be described below and will not be described herein again.
The above is only one embodiment, and in practical applications, including but not limited to the above embodiments, the embodiments are not specifically limited herein, and may be within the protection scope of the present application depending on the specific situation.
And S120, controlling the corresponding outer tube in the ANPC type three-level inverter circuit to be turned off.
The corresponding outer tube in the ANPC type three-level inverter circuit specifically refers to the outer tube which is conducted at the moment.
In practical application, when the ANPC type three-level inverter circuit outputs zero level, two current loops are provided inside the ANPC type three-level inverter circuit, which are respectively:
1) the ANPC type three-level inverter circuit outputs a current loop in the ANPC type three-level inverter circuit when the current loop is at a zero level in a first output state, at this time, the on-off state of each switching tube in the ANPC type three-level inverter circuit is as shown in fig. 3a or fig. 4a, and the first switching tube T1, the third switching tube T3 and the sixth switching tube T6 are turned on; when the current flows out, the current loop is as shown in fig. 3a, specifically: the middle point on the direct current side of the ANPC type three-level inverter circuit → the sixth switching tube T6 → the parasitic diode of the third switching tube T3 → the output end on the alternating current side of the ANPC type three-level inverter circuit; when the current flows in, the current loop is as shown in fig. 4a, specifically: the output end of the ANPC type three-level inverter circuit on the ac side → the third switching tube T3 → the parasitic diode of the sixth switching tube T6 → the midpoint of the ANPC type three-level inverter circuit on the dc side.
2) The ANPC type three-level inverter circuit outputs a current loop at the zero level in a second output state, and at the moment, the second switch tube T2, the fourth switch tube T4 and the fifth switch tube T5 are conducted; the current loop is symmetrical to the current loop and can be derived from the current loop, and details are not repeated here.
Therefore, when the ANPC type three-level inverter circuit outputs a zero level in the first output state, the corresponding outer tube is the first switch tube T1, and the control signal received by each switch tube is shown as the time T2 in fig. 9a or fig. 9 b; when the ANPC type three-level inverter circuit outputs a zero level in the second output state, the corresponding outer tube in step S120 is the fourth switching tube T4.
Taking fig. 3a or fig. 4a as an example, it can be seen that no path is formed between the first switch transistor T1 and the current path in the figure, that is: no current flows through the first switch tube T1, so that the first switch tube T1 can be turned off at zero current at this time, and after the first switch tube T1 is turned off, the on-off state of each switch tube in the ANPC type three-level inverter circuit is shown in fig. 3b or fig. 4 b; it is inferred that when the ANPC type three-level inverter circuit outputs a zero level in the first output state, no path is formed between the fourth switching tube T4 and the corresponding current path, that is: no current flows through the fourth switching transistor T4, so that the fourth switching transistor T4 may be turned off at this time with zero current.
Therefore, when the inverter circuit has the output state conversion requirement, after the inverter circuit outputs zero level, the corresponding outer tube in the inverter circuit is controlled to be turned off, and the zero current turning-off of the outer tube can be realized.
And S130, after a double follow current loop is constructed in the ANPC type three-level inverter circuit, controlling a corresponding clamping tube in the ANPC type three-level inverter circuit to be turned off by taking the aim of controlling the ANPC type three-level inverter circuit to be converted into a required output state.
Wherein, the freewheel circuit, namely: the current loop in the ANPC type three-level inverter circuit is used for outputting zero level; therefore, a dual-freewheeling circuit is constructed, i.e., the two current circuits are conducted simultaneously.
Taking fig. 3b or fig. 4b as an example, a dual-freewheel loop is constructed, that is: the second switch tube T2 and the fifth switch tube T5 are controlled to be turned on, and at this time, the control signals received by the switch tubes are as shown at the time T3 in fig. 9a or fig. 9 b; when current flows out, the current loop is shown in fig. 3c, and when current flows in, the current loop is shown in fig. 4 c.
It should be noted that, when the ANPC type three-level inverter circuit outputs the zero level in the second output state, the specific process of constructing the dual continuous flow loop can be deduced from the above description, and is not described herein again.
In addition, the demand output state, namely: and the ANPC type three-level inverter circuit carries out output state after output state conversion.
In another embodiment of the present application, when the ANPC type three-level inverter circuit switches its own operation half-cycle, the required output state of the ANPC type three-level inverter circuit is an output state when the ANPC type three-level inverter circuit is in another operation half-cycle except the current operation half-cycle; wherein, the current operation half cycle includes: a positive half cycle or a negative half cycle.
Taking fig. 3c or fig. 4c as an example, if the ANPC type three-level inverter circuit outputs a zero level in the first output state, the required output state is the second output state; therefore, the aim of controlling the ANPC type three-level inverter circuit to be converted into a required output state is fulfilled, and the corresponding clamp tube in the ANPC type three-level inverter circuit is controlled to be turned off, namely: the sixth switch tube T6 is controlled to be turned off, and the control signals received by the switch tubes are as shown at time T4 in fig. 9 a; after the completion, the on-off state of each switching tube in the ANPC type three-level inverter circuit is shown in fig. 5a or fig. 6 a.
It should be noted that, when the ANPC type three-level inverter circuit outputs the zero level in the second output state, the specific process of controlling the switching off of the corresponding clamp tube in the ANPC type three-level inverter circuit is deduced from the above description with the goal of controlling the ANPC type three-level inverter circuit to be converted into the required output state, and details thereof are not repeated herein.
In another embodiment of the present application, when the ANPC-type three-level inverter circuit converts its output state to the power-off state, the required output state of the ANPC-type three-level inverter circuit is the power-off state.
Taking fig. 3c or fig. 4c as an example, the ANPC three-level inverter circuit outputs a zero level in the first output state, and the required output state is an off state, so that the objective of controlling the ANPC three-level inverter circuit to switch to the required output state is to control the corresponding clamp in the ANPC three-level inverter circuit to be turned off, that is: the fifth switch tube T5 and the sixth switch tube T6 are both controlled to be turned off, and the control signals received by the switch tubes at this time are as shown at the time T4 in fig. 9 b; after the completion, the on-off state of each switching tube in the ANPC type three-level inverter circuit is shown in fig. 7a or fig. 8 a.
It should be noted that, when the ANPC-type three-level inverter circuit outputs the zero level in the second output state, the specific process of controlling the turn-off of the corresponding clamp tube in the ANPC-type three-level inverter circuit is the same as that described above with the goal of controlling the ANPC-type three-level inverter circuit to be converted into the required output state, and details are not repeated here.
As can be seen from the above, after the dual freewheeling circuit is constructed in the ANPC-type three-level inverter circuit, the sixth switching tube T6 is turned off, or the fifth switching tube T5 and the sixth switching tube T6 are turned off, the output level of the ANPC-type three-level inverter circuit is not changed, and is still at a zero level, that is: after a double follow current loop is constructed in the inverter circuit, any clamping tube in the inverter circuit is turned off, and the output level of the inverter circuit cannot be changed.
Therefore, after the double follow current loop is constructed in the inverter circuit, the corresponding clamping tube is controlled to be turned off, and the zero-voltage turn-off of the clamping tube can be realized.
And S140, controlling the switching-off or switching-on of the corresponding inner tube and the corresponding outer tube in the ANPC type three-level inverter circuit by taking the control of the ANPC type three-level inverter circuit to be converted into a required output state as a target.
In step S130, the on-off of the corresponding clamp tube in the ANPC type three-level inverter circuit has been adjusted to be the same as the on-off of the corresponding clamp tube in the demand output state, so in step S140, the on-off of the corresponding outer tube and the corresponding inner tube in the ANPC type three-level inverter circuit is adjusted to be the same as the demand output state, that is, the output state of the ANPC type three-level inverter circuit can be converted into the demand output state; the detailed process will be described in detail below, and will not be described herein.
To sum up, the switching modulation method of the ANPC type three-level inverter circuit respectively realizes zero current turn-off of the outer tube of the ANPC type three-level inverter circuit and zero voltage turn-off of the clamp tube of the ANPC type three-level inverter circuit, so that stress borne by the outer tube of the ANPC type three-level inverter circuit and the clamp tube of the ANPC type three-level inverter circuit in the output state conversion process can be reduced, overvoltage can be avoided in the output state conversion process of the outer tube of the ANPC type three-level inverter circuit and the clamp tube of the ANPC type three-level inverter circuit, the outer tube and the clamp tube of the ANPC type three-level inverter circuit can select a switching tube with lower withstand voltage, and the cost of the ANPC type three-level inverter circuit can be reduced.
In another embodiment of the present application, when the ANPC type three-level inverter circuit switches its own half-cycle, a specific implementation manner of step S140 is as follows: and simultaneously controlling the corresponding inner tube in the ANPC type three-level inverter circuit to be switched off and the corresponding outer tube to be switched on.
Taking fig. 5a and fig. 6a as an example, at this time, the required output state of the ANPC three-level inverter circuit is the second output state, and assuming that after the conversion, the ANPC three-level inverter circuit outputs the zero level in the second output state, the corresponding inner tube and the corresponding outer tube in the ANPC three-level inverter circuit are controlled to be conducted at the same time, that is: simultaneously, the third switch tube T3 is controlled to be turned off and the fourth switch tube T4 is controlled to be turned on, and at this time, the control signal received by each switch tube is as shown at the time T5 in fig. 9 a; after the completion, the on-off state of each switching tube in the ANPC type three-level inverter circuit is shown in fig. 5b or fig. 6 b.
Assuming that after the conversion, the ANPC type three-level inverter circuit outputs a low level in the second output state, and simultaneously controls the conduction of the corresponding inner tube and the corresponding outer tube in the ANPC type three-level inverter circuit, that is: simultaneously controlling the second switching tube T2 and the third switching tube T3 to be switched off and the fourth switching tube T4 to be switched on; after the completion, the on-off state of each switching tube in the ANPC type three-level inverter circuit is shown in fig. 5c or fig. 6 c.
It should be noted that, when the ANPC type three-level inverter circuit outputs the zero level in the second output state, the specific process of controlling the conduction of the corresponding inner tube and the corresponding outer tube in the ANPC type three-level inverter circuit may be deduced from the above description, and details thereof are not repeated herein.
In another embodiment of the present application, when the ANPC type three-level inverter circuit switches its own half-cycle, a specific implementation manner of step S140 is as follows: and after the corresponding inner tube in the ANPC type three-level inverter circuit is controlled to be switched off, the corresponding outer tube in the ANPC type three-level inverter circuit is controlled to be switched on.
Taking fig. 5a and fig. 6a as an example, at this time, the required output state of the ANPC three-level inverter circuit is the second output state, and assuming that after the conversion, the ANPC three-level inverter circuit outputs the zero level in the second output state, the corresponding inner tube in the ANPC three-level inverter circuit is controlled to be turned off, that is: controlling the third switching tube T3 to turn off, and after the switching is completed, turning on and off the switching tubes in the ANPC type three-level inverter circuit, as shown in fig. 5d or fig. 6 d; and then, controlling the conduction of a corresponding outer pipe in the ANPC type three-level inverter circuit, namely: controlling the fourth switching tube T4 to be conducted; after the completion, the on-off state of each switching tube in the ANPC type three-level inverter circuit is shown in fig. 5b or fig. 6 b.
Assuming that the ANPC type three-level inverter circuit outputs a low level in a second output state after conversion, controlling a corresponding inner tube in the ANPC type three-level inverter circuit to be turned off, namely: controlling the second switch tube T2 and the third switch tube T3 to be turned off, and after the switching is completed, turning on and off the switch tubes in the ANPC type three-level inverter circuit, as shown in fig. 5e or fig. 6 e; and then, controlling the conduction of a corresponding outer pipe in the ANPC type three-level inverter circuit, namely: and controlling the fourth switching tube T4 to be turned on, and after the switching is completed, turning on and off the switching tubes in the ANPC type three-level inverter circuit, as shown in fig. 5c or fig. 6 c.
It should be noted that, when the ANPC type three-level inverter circuit outputs the zero level in the second output state, the specific process of controlling the conduction of the corresponding outer tube in the ANPC type three-level inverter circuit after controlling the corresponding inner tube in the ANPC type three-level inverter circuit to be turned off may be inferred from the above description, and will not be described herein again.
In another embodiment of the present application, the step of controlling the turn-off of the corresponding inner tube in the ANPC type three-level inverter circuit in the first two embodiments is performed forward, and the step of controlling the turn-off of the corresponding clamp tube in the ANPC type three-level inverter circuit in step S130 is performed simultaneously; this embodiment may be specific, and is not limited specifically herein, and is within the scope of the present application.
In this embodiment, after the step of controlling the conduction of the corresponding outer tube in the ANPC type three-level inverter circuit in the first two embodiments, the method further includes: all inner tubes in the ANPC type three-level inverter circuit are controlled to be turned off; therefore, the short circuit of the direct current bus in the ANPC type three-level inverter circuit can be avoided when the modulation strategy controls the ANPC type three-level inverter circuit to output high level or low level after conversion.
Taking fig. 5b or fig. 6b as an example, all the inner tubes in the ANPC type three-level inverter circuit are controlled to be turned off, that is: the second switch tube T2 and the third switch tube T3 are both controlled to be turned off, and at this time, the control signals received by the switch tubes are as shown at the time T6 in fig. 9 a; after the completion, the on-off state of each switching tube in the ANPC type three-level inverter circuit is shown in fig. 5c or fig. 6 c.
It should be noted that, when the current output state of the ANPC type three-level inverter circuit is the second output state, the specific process of controlling all the inner tubes in the ANPC type three-level inverter circuit to be turned off is the same as described above, and details are not repeated here.
In another embodiment of the present application, when the ANPC type three-level inverter circuit converts its output state to the power-off state, a specific implementation manner of step S140 is as follows: and controlling all inner tubes in the ANPC type three-level inverter circuit to be switched off.
Taking fig. 7a and 8a as an example, the required output state of the ANPC three-level inverter circuit is a shutdown state, and therefore, all the internal tubes in the ANPC three-level inverter circuit are turned off, that is: the second switch tube T2 and the third switch tube T3 are both controlled to be turned off, and at this time, the control signals received by the switch tubes are as shown at the time T5 in fig. 9 b; after the completion, the on-off state of each switching tube in the ANPC type three-level inverter circuit is shown in fig. 7b or fig. 8 b.
It should be noted that when the ANPC type three-level inverter circuit outputs a zero level in the second output state, the specific process of controlling all the inner tubes in the ANPC type three-level inverter circuit to be turned off is the same as described above, and details thereof are not repeated herein.
In another embodiment of the present application, as shown in fig. 10, when the ANPC-type three-level inverter circuit converts its output state into the outer-pipe off state, the switching modulation method of the ANPC-type three-level inverter circuit further includes the following steps after step S120:
s210, judging whether the required output state is the outer tube shutoff state.
If the required output state is the outer tube off state, executing step S140; if the required output state is not the outer tube off state, step S130 is executed.
The above description is only another specific embodiment of the switching modulation method of the ANPC type three-level inverter circuit, and is not limited herein, which may be determined according to specific situations.
Another embodiment of the present application provides another implementation of the switching modulation method of the ANPC type three-level inverter circuit, and the specific flow thereof can refer to fig. 11 (shown only on the basis of fig. 2), and on the basis of any of the above embodiments, after step S110, the method further includes:
if the ANPC type three-level inverter circuit does not output the zero level, the process returns to the step S120 after the step S150 is performed.
And S150, controlling the ANPC type three-level inverter circuit to output a zero level in the current output state.
It should be noted that, after the step S150 is added, the ANPC type three-level inverter circuit may be forced to output a zero level, so that even if the ANPC type three-level inverter circuit does not output a zero level when the ANPC type three-level inverter circuit has an output state switching requirement, the output state may be switched, and therefore, the ANPC type three-level inverter circuit may be shut down and switched to the operation half cycle at any time.
In another embodiment of the present application, a specific implementation manner of step S150 is: and after all inner tubes in the ANPC type three-level inverter circuit are controlled to be switched off, a follow current loop in the current output state is established in the ANPC type three-level inverter circuit.
Taking the current output state of the ANPC type three-level inverter circuit as the first output state as an example, all inner tubes in the ANPC type three-level inverter circuit are controlled to be turned off, that is: controlling the second switch tube T2 and the third switch tube T3 to be turned off, wherein the control signal received by each switch tube is as shown at the time T0 in fig. 9a or fig. 9 b; after the completion, the on-off state of each switching tube of the ANPC type three-level inverter circuit is shown in fig. 3d or fig. 4 d; then, a follow current loop in the current output state is constructed in the ANPC type three-level inverter circuit, namely: controlling the third switch tube T3 to be turned on, wherein the control signal received by each switch tube is as shown at time T1 in fig. 9a or fig. 9 b; after the completion, the on-off state of each switching tube of the ANPC type three-level inverter circuit is shown in fig. 3a or fig. 4 a.
It should be noted that, when the current output state of the ANPC-type three-level inverter circuit is the second output state, after all inner tubes in the ANPC-type three-level inverter circuit are controlled to be turned off, the specific process of constructing the follow current loop in the current output state in the ANPC-type three-level inverter circuit is the same as that described above, and details are not described here.
In any of the above embodiments, there is an execution time difference between two adjacent steps, where the execution time difference takes the maximum value of the following times:
dead time in a modulation strategy of the ANPC type three-level inverter circuit, conducting time of each switching tube in the ANPC type three-level inverter circuit and turn-off time of each switching tube in the ANPC type three-level inverter circuit.
In practical applications, the execution time difference is usually designed as a dead time.
Another embodiment of the present application provides an inverter, a specific structure of which can be seen in fig. 12, and the inverter specifically includes: a controller 10, at least one driving unit 20 and at least one ANPC type three-level inverter circuit 30.
In the inverter, the direct current side of each ANPC type three-level inverter circuit 30 is connected to the direct current bus of the inverter; the ac output terminal of each ANPC type three-level inverter circuit 30 serves as a phase output terminal of the inverter; each ANPC type three-level inverter circuit 30 is controlled by the controller 10 through the corresponding driving unit 20, and the controller 10 is configured to execute the switching modulation method of the ANPC type three-level inverter circuit 30 provided in any of the above embodiments.
In another embodiment of the present application, referring to fig. 13, the inverter further includes: at least one dc-dc conversion circuit 50.
Wherein, one end of each dc-dc conversion circuit 50 is connected to a dc bus; the other end of each dc-dc conversion circuit 50 is respectively used as a corresponding port on the dc side of the inverter; each dc-dc converter circuit 50 is controlled by the controller 10 through a corresponding driving unit 20 (for simplicity, the driving circuit between the controller and the dc-dc converter circuit 50 is not shown).
In the above two embodiments, the controller 10 may be an independent controller, or may also be a system controller in a higher-level system, which is not specifically limited herein, and is within the scope of the present application as the case may be.
In the above description of the disclosed embodiments, features described in various embodiments in this specification can be substituted for or combined with each other to enable those skilled in the art to make or use the present application. The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner. Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make numerous possible variations and modifications to the present teachings, or modify equivalent embodiments to equivalent variations, without departing from the scope of the present teachings, using the methods and techniques disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the scope of the protection of the technical solution of the present invention, unless the contents of the technical solution of the present invention are departed.
Claims (17)
1. A switching modulation method of an ANPC type three-level inverter circuit is characterized by comprising the following steps:
when the ANPC type three-level inverter circuit has an output state conversion requirement, judging whether the inverter circuit outputs a zero level;
if the inverter circuit outputs zero level, controlling the corresponding outer tube in the inverter circuit to be switched off;
after a double follow current loop is constructed in the inverter circuit, the inverter circuit is controlled to be converted into a required output state, and a corresponding clamping tube in the inverter circuit is controlled to be turned off;
and controlling the on/off of the corresponding inner tube and the corresponding outer tube in the inverter circuit by taking the aim of controlling the inverter circuit to be converted into the required output state.
2. The method of claim 1 wherein said ANPC three-level inverter circuit has output state transition requirements, comprising:
the inverter circuit switches the running half period of the inverter circuit, or the inverter circuit converts the output state of the inverter circuit into a shutdown state, or the inverter circuit converts the output state of the inverter circuit into a fault state; the fault state is the shutdown state or the outer tube shutdown state.
3. The ANPC type three-level inverter circuit switching modulation method according to claim 2, wherein when the inverter circuit switches its own operating half cycle, the required output state is an output state when the inverter circuit is in another operating half cycle other than the current operating half cycle;
when the inverter circuit converts the output state of the inverter circuit into the shutdown state, the required output state is the shutdown state;
when the inverter circuit converts the output state of the inverter circuit into the outer tube turn-off state, the required output state is the outer tube turn-off state.
4. The method of modulating switching in an ANPC type three-level inverter circuit as claimed in claim 3, wherein said current half-cycle of operation comprises: a positive half cycle or a negative half cycle.
5. The ANPC type three-level inverter circuit switching modulation method according to claim 3, wherein controlling turning off or on of a corresponding inner tube and a corresponding outer tube in the inverter circuit when the inverter circuit switches its own half-cycle of operation comprises:
and simultaneously controlling the corresponding inner pipe to be switched off and the corresponding outer pipe to be switched on, or controlling the corresponding outer pipe to be switched on after controlling the corresponding inner pipe to be switched off.
6. The ANPC type three-level inverter circuit switching modulation method according to claim 5, wherein the step of controlling the respective inner tubes to be turned off is advanced while the step of controlling the respective clamp tubes to be turned off is performed.
7. The ANPC type three-level inverter circuit switching modulation method according to claim 5, further comprising, after controlling the conduction of the corresponding outer tube:
and controlling all the inner pipes to be turned off.
8. The ANPC type three-level inverter circuit switching modulation method according to claim 3, wherein when the inverter circuit converts its output state to the shutdown state, controlling turn-off or turn-on of a corresponding inner tube and a corresponding outer tube in the inverter circuit comprises:
and controlling all the inner pipes to be turned off.
9. The ANPC-type three-level inverter circuit switching modulation method according to claim 3, wherein the outer tube OFF state is compared with an original output state of the inverter circuit, and only all the outer tubes are OFF.
10. The method for modulating switching of the ANPC-type three-level inverter circuit according to claim 9, wherein when the inverter circuit converts its output state into the outer-tube off state, after controlling the respective outer tubes in the inverter circuit to turn off, the method further comprises:
judging whether the required output state is the off state of the outer tube;
if the demand output state is the off state of the outer tube, executing a step of controlling the on or off of the corresponding inner tube and the corresponding outer tube in the inverter circuit by taking the inverter circuit to be controlled to be converted into the demand output state as a target;
and if the required output state is not the outer tube turn-off state, executing a step of controlling the turn-off of a corresponding clamping tube in the inverter circuit by taking the aim of controlling the inverter circuit to be converted into the required output state after a double follow current loop is constructed in the inverter circuit.
11. The ANPC type three-level inverter circuit switching modulation method according to any one of claims 1 to 10, wherein if the inverter circuit does not output a zero level, after controlling the inverter circuit to output a zero level in a current output state, the method returns to the step of controlling the corresponding outer tube in the inverter circuit to be turned off.
12. The method of claim 11 wherein controlling the inverter circuit to output a zero level at a current output state comprises:
and after all the inner tubes are controlled to be switched off, constructing a follow current loop in the current output state in the inverter circuit.
13. The method for modulating switching of an ANPC-type three-level inverter circuit according to claim 11, wherein the difference in execution time between two adjacent steps takes the maximum value of:
dead time in a modulation strategy of the inverter circuit, conducting time of each switching tube in the inverter circuit and turn-off time of each switching tube.
14. An inverter, comprising: the controller, at least one driving unit and at least one ANPC type three-level inverter circuit; wherein:
the direct current side of each ANPC type three-level inverter circuit is connected with a direct current bus of the inverter;
each of the inverter circuits is controlled by the controller through the corresponding driving unit, respectively, and the controller is configured to perform the switching modulation method of the ANPC type three-level inverter circuit according to any one of claims 1 to 13.
15. The inverter of claim 14, wherein the ac output of each inverter circuit is a phase output of the inverter.
16. The inverter according to claim 14 or 15, further comprising: at least one DC-DC conversion circuit; wherein:
one end of each direct current-direct current conversion circuit is connected with the direct current bus;
the other end of each direct current-direct current conversion circuit is respectively used as a corresponding port on the direct current side of the inverter;
each direct current-direct current conversion circuit is controlled by the controller through the corresponding driving unit.
17. The inverter according to claim 14 or 15, wherein the controller is a controller provided independently or as a system controller in a superior system.
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| CN202111305902.2A CN113872460A (en) | 2021-11-05 | 2021-11-05 | Switching modulation method for inverter and ANPC type three-level inverter circuit |
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Cited By (1)
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