CN115528934A - Three-level alternating current-direct current universal converter topology and control method thereof - Google Patents
Three-level alternating current-direct current universal converter topology and control method thereof Download PDFInfo
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- CN115528934A CN115528934A CN202211392583.8A CN202211392583A CN115528934A CN 115528934 A CN115528934 A CN 115528934A CN 202211392583 A CN202211392583 A CN 202211392583A CN 115528934 A CN115528934 A CN 115528934A
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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
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac 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
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac 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
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
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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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Abstract
The application provides a three-level alternating current-direct current universal converter topology which comprises a direct current port group, a power module, a switch switching module and an output port group; the power module comprises a power switch device group and a corresponding anti-parallel diode, and the power module is connected to the direct current port group in a three-phase mode; the switch switching module comprises a mode switching switch group and an output port switching switch group, the mode switching switch group is used for switching the converter topology into an AC/DC conversion mode or a DC/DC conversion mode according to a preset mode switching strategy, and the output port switching switch group is used for switching the output mode of the output port group according to the conversion mode of the converter topology and the port requirement. Therefore, the three-level alternating current-direct current universal converter topology can realize the functions of AC/DC and DC/DC, and achieves the generalization and standardization of three-level AC/DC and DC/DC.
Description
Technical Field
The application relates to the technical field of electrical automation equipment, in particular to a three-level alternating current-direct current universal converter topology and a control method thereof.
Background
Under the energy demand and environmental protection pressures, especially the recently proposed war of "carbon neutralization, carbon peak-to-peak", the demand for new energy has grown exponentially. The converter can be divided into an AC/DC converter and a DC/DC converter according to functions, and can be divided into a two-level converter, a three-level converter and a multi-level converter according to the number of levels, wherein the common three-level AC/DC converter topology structure comprises a diode Neutral Point Clamped (NPC) topology and an Active Neutral Point Clamped (ANPC) topology, and the common DC/DC converter comprises a Buck conversion Buck circuit, a boost chopper boost circuit and the like.
In the prior art, for both AC/DC conversion scenarios and DC/DC conversion scenarios, corresponding converter topologies need to be used, for example: to implement AC/DC conversion, a specialized AC/DC converter topology needs to be used. Therefore, the existing converter has single topological function and poor use flexibility, and is difficult to realize the generalization and standardization of alternating current-direct current conversion. Therefore, a three-level AC/DC universal converter topology is needed, which allows a user to realize AC/DC and DC/DC functions with only one converter, thereby realizing generalization and standardization of three-level AC/DC and DC/DC.
Disclosure of Invention
In view of the above, the present application provides a three-level AC/DC universal converter topology and a control method thereof, so as to implement generalization and standardization of three-level AC/DC and DC/DC.
The technical scheme is as follows:
in a first aspect, an embodiment of the present application provides a three-level ac/dc universal converter topology, where the converter topology includes: the power module comprises a direct current port group, a power module, a switch switching module and an output port group; wherein the content of the first and second substances,
the power module comprises a power switch device group and a corresponding anti-parallel diode, and the power module is connected to the direct current port group in a three-phase mode;
the switch switching module comprises a mode switching switch group and an output port switching switch group, the mode switching switch group is used for switching the converter topology into an AC/DC conversion mode or a DC/DC conversion mode according to a preset mode switching strategy, and the output port switching switch group is used for switching the output mode of the output port group according to the conversion mode of the converter topology and the port requirement;
the output port group comprises a first output port group and a second output port group, the first output port group and the second output port group are respectively and symmetrically connected to the power module, and the first output port group and the second output port group respectively comprise three paths of output ports.
Optionally, the mode switch group includes a first mode switch group and a second mode switch group, and the output port switch group includes a first output port switch group and a second output port switch group; the first mode selector switch group is arranged in the power module, the second mode selector switch group is arranged in the output port group, the first output port selector switch group is connected with the first output port group, and the second output port selector switch group is connected with the second output port group.
Optionally, the topology further includes an LC filtering module; wherein the filtering module is disposed between the power module and the output port group.
Optionally, the dc port group includes a positive bus, a zero potential bus, and a negative bus;
the converter topology further comprises a first support capacitor and a second support capacitor; the positive electrode of the first supporting capacitor is connected with the positive bus, the negative electrode of the first supporting capacitor is connected with the positive electrode of the second supporting capacitor, the negative electrode of the second supporting capacitor is connected with the negative bus, a zero potential point is arranged between the first direct current capacitor and the second direct current capacitor, and the zero potential point is positioned on the zero potential bus.
Optionally, the mode switch group is configured to switch the converter topology to an AC/DC conversion mode or a DC/DC conversion mode according to a preset mode switching policy, and includes:
closing the first mode switch set and the second mode switch set to switch the converter topology to an AC/DC conversion mode;
and disconnecting the first mode switch group and the second mode switch group to switch the converter topology into a DC/DC conversion mode.
Optionally, the output port switch block is configured to switch an output mode of the output port block according to a conversion mode of the converter topology and a port requirement, and includes:
in response to the conversion mode of the converter topology being an AC/DC conversion mode, disconnecting the output port switch group and switching the output mode of the output port group to be three-phase alternating current output;
and responding to the conversion mode of the converter topology being a DC/DC conversion mode, switching on the output port change-over switch group according to the port requirement, and switching the output mode of the output port group to be one-way direct current output, or switching off the output port change-over switch group according to the port requirement, and switching the output mode of the output port group to be three-way bipolar direct current output or six-way direct current output.
Optionally, the power module is configured to:
in response to the conversion mode of the converter topology being an AC/DC conversion mode, controlling the power switch device group according to a preset first state switching strategy, so that the converter topology outputs preset state levels through an output port group, wherein the preset state levels comprise a positive level state, a zero level state and a negative level state;
responding to the conversion mode of the converter topology being a DC/DC conversion mode, controlling the power switch device group according to a preset second state switching strategy, and switching the working state of the converter topology, wherein the working state of the converter topology comprises: boost operating state and Buck operating state.
In a second aspect, an embodiment of the present application provides a control method for a three-level ac/dc universal converter topology, where the control method is applied to any one of the converter topologies, and the control method includes:
acquiring a conversion mode requirement of the converter topology;
when the conversion mode requirement is an AC/DC conversion mode requirement, controlling the first mode switch group and the second mode switch group to be closed;
and when the conversion mode requirement is a DC/DC conversion mode requirement, controlling the first mode switch group and the second mode switch group to be switched off.
Optionally, the control method further includes:
acquiring a conversion mode and a port requirement of the converter topology;
in response to the conversion mode of the converter topology being an AC/DC conversion mode, disconnecting the output port switch group and switching the output mode of the output port group to be three-phase alternating current output;
and responding to the conversion mode of the converter topology being a DC/DC conversion mode, switching on the output port change-over switch group according to the port requirement, and switching the output mode of the output port group to be one-way direct current output, or switching off the output port change-over switch group according to the port requirement, and switching the output mode of the output port group to be three-way bipolar direct current output or six-way direct current output.
Optionally, the control method further includes: responding to the fact that the conversion mode of the converter topology is an AC/DC conversion mode, acquiring output level requirements of the converter topology, and controlling the power switch device group according to a preset first state switching strategy, so that the converter topology outputs preset state levels corresponding to the output level requirements through an output port group, wherein the output level requirements comprise a positive level state requirement, a zero level state requirement and a negative level state;
responding to the fact that the conversion mode of the converter topology is a DC/DC conversion mode, obtaining the working state requirement of the converter topology, and controlling the power switch device group according to a preset second state switching strategy to enable the converter topology to be in a Boost working state or a Buck working state corresponding to the working state requirement.
The technical scheme has the following beneficial effects:
the embodiment of the application provides a three-level alternating current-direct current universal converter topology, converter topology includes: the power module comprises a direct current port group, a power module, a switch switching module and an output port group; the power module comprises a power switch device group and a corresponding anti-parallel diode, and the power module is connected to the direct current port group in a three-phase mode; the switch switching module comprises a mode switching switch group and an output port switching switch group, the mode switching switch group is used for switching the converter topology into an AC/DC conversion mode or a DC/DC conversion mode according to a preset mode switching strategy, and the output port switching switch group is used for switching the output mode of the output port group according to the conversion mode of the converter topology and the port requirement; the output port group comprises a first output port group and a second output port group, the first output port group and the second output port group are respectively and symmetrically connected to the power module, and the first output port group and the second output port group respectively comprise three paths of output ports. Therefore, the three-level alternating current-direct current universal converter topology can realize the functions of AC/DC and DC/DC, and achieves the generalization and standardization of three-level AC/DC and DC/DC.
The embodiment of the application also provides a control method corresponding to the converter topology, and the control method has the same beneficial effects as the converter topology.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present application, 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 conventional ANPC three-level circuit topology according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of a conventional DC/DC three-level circuit topology according to an embodiment of the present application;
fig. 3 is a schematic diagram of a three-level ac/dc universal converter topology according to an embodiment of the present disclosure;
fig. 4 is a schematic diagram of a working state of a topology of a three-level ac/dc universal converter in a Boost working state 1 according to an embodiment of the present disclosure;
fig. 5 is a schematic diagram of an operating state of a three-level ac/dc universal converter topology in a Boost operating state 2 according to an embodiment of the present application;
fig. 6 is a schematic diagram of an operating state of a three-level ac/dc universal converter topology in a Buck operating state 1 according to an embodiment of the present application;
fig. 7 is a schematic diagram of an operating state of a three-level ac/dc universal converter topology in a Buck operating state 2 according to an embodiment of the present application;
fig. 8 is a schematic flowchart of a control method for a three-level ac/dc universal converter topology according to 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.
Referring to fig. 1, a schematic diagram of a conventional active midpoint clamping three-level topology ANPC three-level circuit topology is shown, in which each phase (three phases in total, T) is A1 ～T A6 Is A phase, T B1 ～T B6 Is B phase, T C1 ～T C6 For C phase) comprises 6 power switches and corresponding anti-parallel diodes, and the circuit topology can output P, O, N three level states, namely corresponding
0、
Three levels.
Referring to fig. 2, a conventional DC/DC three-level circuit topology is shown, and the circuit topology includes 4 power switches, an anti-parallel diode, an inductor L, and a filter capacitor C 1 、C 2 、C 3 And (4) forming. According to the power transmission direction, the method can be divided into Buck and Boost modes. When the converter works in Boost mode, energy is supplied from the low-voltage side V l To the high-voltage side V h Power switching device T 2 、T 3 In a switch-controlled state, T 1 、T 4 The reverse parallel diode is in a free-wheeling state. When the converter operates in Buck mode, energy is transferred from the high-voltage side V h To the low-voltage side V l Power switching device T 1 、T 4 In a switch-controlled state, T 2 、T 3 The reverse parallel diode is in a free-wheeling state.
In the topology structure of the existing converter, both AC/DC and DC/DC converters need to be implemented by using a dedicated topology structure, which makes it difficult to implement AC/DC generalization and standardization, so that the existing converter topology has the disadvantages of single function and poor flexibility in use, and in order to implement three-level AC/DC and DC/DC generalization and standardization, in a first aspect, the embodiment of the present application provides a three-level AC/DC universal converter topology, please refer to fig. 3, where the converter topology includes: the power module comprises a direct current port group, a power module, a switch switching module and an output port group; wherein the content of the first and second substances,
the power module comprises a power switch device group and a corresponding anti-parallel diode, and the power module is connected to the direct current port group in a three-phase mode.
Specifically, the power module comprises 18 power switching devices and anti-parallel diodes corresponding to the power switching devices, wherein the 18 power switching devices form a phase according to 6 power switching devices, and T is A1 ～T A6 Is A phase, T B1 ～T B6 Is B phase, T C1 ～T C6 The DC port group is connected to the DC power supply side for the C phase, and it is understood that the DC port group is a port for DC power supply side connection, and may include a positive bus, a zero potential bus, and a negative bus.
The switch switching module comprises a mode switching switch group and an output port switching switch group, the mode switching switch group is used for switching the converter topology into an AC/DC conversion mode or a DC/DC conversion mode according to a preset mode switching strategy, and the output port switching switch group is used for switching the output mode of the output port group according to the conversion mode of the converter topology and port requirements.
The switch switching module may specifically include a mode switch group and an output port switch group, wherein the mode switch group includes a first mode switch group (K1-K3) and a second mode switch group (K7-K9), and the output port switch group includes a first output port switch group (K4-K6) and a second output port switch group (K10-K12); the first mode selector switch group is arranged in the power module, the second mode selector switch group is arranged in the output port group, the first output port selector switch group is connected with the first output port group, and the second output port selector switch group is connected with the second output port group.
The output port group comprises a first output port group and a second output port group, the first output port group and the second output port group are respectively and symmetrically connected to the power module, and the first output port group and the second output port group respectively comprise three paths of output ports.
Specifically, the first mode switch sets (K1 to K3) are respectively disposed in three phases of the power module, specifically between the upper bridge and the lower bridge of each phase, as shown in fig. 1The following steps: k1 is set at T A2 And T A3 K2 is set at T B2 And T B3 K3 is set at T C2 And T C3 In between.
The second mode switch groups (K7 to K9) are respectively disposed in the output port groups, specifically between the first output port group and the second output port group, as shown in fig. 1: k7 is set between C output in the first output port group and C output in the second output port group, K8 is set between B output in the first output port group and B output in the second output port group, and K9 is set between A output in the first output port group and A output in the second output port group.
The first output port switch group is connected to the first output port group, and the second output port switch group is connected to the second output port group, as shown in fig. 1: k4, K5 and K6 are respectively merged into the three-way output of the first output port group, and K10, K11 and K12 are respectively merged into the three-way output of the second output port group.
In the embodiment of the application, the mode switching switch group can control the conversion mode of the converter topology according to a preset mode switching strategy, and the conversion mode of the converter topology comprises an AC/DC conversion mode or a DC/DC conversion mode. The output port switch group can switch the output mode of the output port group according to the conversion mode of the converter topology and the port requirement. The power module can control the on and off of the power switch device group according to the conversion mode of the converter topology and a preset state switching strategy so as to control the output level state and the working state of the converter topology.
Specifically, when the first mode switch group and the second mode switch group are closed, the converter topology is switched to an AC/DC conversion mode, and when the converter topology is in the AC/DC conversion mode, the output port switch group is opened, the output mode of the output port group is set to a three-phase alternating current output mode, and the power switch device group may be controlled according to a preset first state switching strategy, so that the converter topology outputs a preset state level through the output port group, where the preset state level includes a positive level state, a zero level state, and a negative level state;
in the AC/DC conversion mode, the switching state and the output voltage can be referred to the following table, where x = A, B, C corresponds to an a-phase arm, a B-phase arm, and a C-phase arm.
Referring to the table above, the above switch states constitute a three-level midpoint active clamp (ANPC) topology, terminal P + 、P - Direct current, terminal P A1 、P B1 、P C1 (or P) A2 、P B2 、P C2 ) And connecting to exchange. By controlling the power switch state device (T) x1 To T x6 ) Realize the control of P, O, N in three states, namely corresponding
0、
Three levels. It should be noted that the 0 level output voltage corresponds to the switching states of four power switching state devices, and in actual operation, the switching control may be performed by considering the loss balance, so as to balance the loss of each power switching state device. The ANPC modulation algorithms are various, SPWM (sinusoidal pulse width modulation) and SVPWM (space vector modulation) are common, and the control commands of the power module are calculated through the modulation algorithms, so that the rectification and inversion functions can be realized through the control of the power switch state device.
Specifically, when the first mode switch group and the second mode switch group are switched off, the converter topology is switched to the DC/DC conversion mode, and when the converter topology is in the DC/DC conversion mode, the output port switch group is closed according to the port requirement, the output mode of the output port group is switched to one path of direct current output, or, the output port switch group is switched off according to the port requirement, the output mode of the output port group is switched to three paths of bipolar direct current output or six paths of direct current output, and the power switch device group can be controlled according to a preset second state switching strategy to switch the working state of the converter topology, where the working state of the converter topology includes: boost operating state and Buck operating state.
In particular, the terminals P +, P-are connected with high voltage direct current, and the terminal P A1 (or P) B1 、P C1 ) And P A2 (or P) B2 、P C2 ) Connected to low voltage DC, at low voltage side P x1 、P 0 、P x2 Between the terminals, there are three levels of + 0-C (where x = A, B, C), and on the high voltage side P + 、P 0 、P - The terminals form three levels of + 0 and-0, the three-level DC/DC topology can realize that the high-voltage side and the low-voltage side are bipolar structures, and energy bidirectional control can be realized due to the fact that a power device and an anti-parallel diode are used in the topology.
The DC/DC conversion mode will be described with reference to the switching states, output modes and operating states shown in the following table:
see table above, where x = A, B, C corresponds to the a-phase arm, the B-phase arm, and the C-phase arm.
In a Boost operating mode:
boost operating state 1, see fig. 4, power switch T x5 、T x6 In a conducting state, the upper half bridge energy V L1 Through T x5 And T x2 Is connected in parallel to the diode to the inductor L x1 Transferring; lower half-bridge energy V L2 Through T x6 And T x3 The anti-parallel diode of (1) to the inductor L x2 And transferring, wherein the inductor stores energy.
Boost operating state 2, which is shown in fig. 5, the power switching device T is switched off x5 、T x6 Upper half bridge V L1 And an inductance L x1 Energy of (2) through T x1 And T x2 Is connected in parallel to the diode direction V H1 Transferring; lower half-bridge V L2 And an inductance L x2 Energy ofPassing T x4 And T x3 To V of the anti-parallel diode H2 And (4) transferring, wherein the inductor releases energy and works in a freewheeling mode.
In the Buck mode of operation:
buck operating mode 1, see FIG. 6, power switch T x1 、T x2 、T x3 、T x4 In the on state, the upper half bridge energy V H1 Through T x1 And T x2 To the inductance L x1 And V L1 Transferring; lower half-bridge energy V H2 Through T x3 And T x4 To the inductance L x2 And V L2 And transferring, wherein the inductor stores energy.
Therefore, the conversion mode of the converter topology can be switched by controlling the mode switching switch group, the output mode of the converter topology can be switched by controlling the output port switching switch group, and the output state of the converter topology can be switched and controlled to output level by controlling the power switch device group.
In the DC/DC conversion mode, when K4 to K6 and K10 to K12 are off, the low-voltage ports may be combined into 6 independent DC ports, each P A1 -P 0 、P B1 -P 0 、P C1 -P 0 、P 0 -P A2 、P 0 -P B2 、P 0 -P C2 Or 3 independent bipolar DC ports can be synthesized, each P A1 -P 0 -P A2 、P B1 -P 0 -P B2 、P C1 -P 0 -P C2 E, K4 &When K6 and K10-K12 are in a closed state, the low-voltage side ports can be combined into a 1-path bipolar direct current port P x1 -P 0 -P x2 (wherein x = a, B, C), the number of dc ports can be redefined by controlling the states of the k 4-k 6, k 10-k 12 switches, greatly improving the flexibility of use. Because the circuit topology is a three-phase structure, the upper half bridge arm is subjected to sampling phase-shift PWM control, three-phase staggered 120-degree parallel connection can be realized, similarly, the lower half bridge can also realize three-phase staggered 120-degree parallel connection, the upper and lower bridge arms can also realize 180-degree staggered parallel connection, the equivalent switching frequency is 6 times of that of a single phase, the total voltage and current fluctuation is reduced, and the parallel connection structure has the advantages of high reliability, good redundancy characteristic and convenience in standardized module design.
In an optional implementation manner, the converter topology provided by the embodiment of the present application may further include an LC filtering module; wherein the filtering module is disposed between the power module and the output port set.
Specifically, the filtering module is disposed between the power module and the output port group, and is configured to suppress interference signals in the converter topology network and filter out ripples, so that the output meets the EMI requirement.
In an optional implementation manner, the converter topology provided by the embodiment of the present application may further include a first support capacitor and a second support capacitor; the positive electrode of the first supporting capacitor is connected with the positive bus, the negative electrode of the first supporting capacitor is connected with the positive electrode of the second supporting capacitor, the negative electrode of the second supporting capacitor is connected with the negative bus, a zero potential point is arranged between the first direct current capacitor and the second direct current capacitor, and the zero potential point is positioned on the zero potential bus.
Specifically, the first support capacitor and the second support capacitor are arranged at the position of the direct current port group, so that the intermediate direct current voltage can be stabilized, and the influence of voltage overshoot and instantaneous overvoltage input at the direct current side on a power switch device in the power module is avoided.
To sum up, the three-level ac/dc universal converter topology provided by the embodiment of the present application includes: the power module comprises a direct current port group, a power module, a switch switching module and an output port group; the power module comprises a power switch device group and a corresponding anti-parallel diode, and the power module is connected to the direct current port group in a three-phase mode; the switch switching module comprises a mode switching switch group and an output port switching switch group, the mode switching switch group is used for switching the converter topology into an AC/DC conversion mode or a DC/DC conversion mode according to a preset mode switching strategy, and the output port switching switch group is used for switching the output mode of the output port group according to the conversion mode of the converter topology and port requirements; the output port group comprises a first output port group and a second output port group, the first output port group and the second output port group are respectively and symmetrically connected to the power module, and the first output port group and the second output port group respectively comprise three paths of output ports. Therefore, the three-level alternating current-direct current universal converter topology can realize the functions of AC/DC and DC/DC, and achieves the generalization and standardization of three-level AC/DC and DC/DC.
A second aspect of the present application provides a method for controlling a three-level ac/dc universal converter topology, which is applied to any one of the three-level ac/dc universal converter topologies provided in the first aspect of the present application, where the method includes:
step S100: acquiring a conversion mode requirement of the converter topology;
step S200: when the conversion mode requirement is an AC/DC conversion mode requirement, controlling the first mode selector switch group and the second mode selector switch group to be closed;
step S300: when the conversion mode requirement is a DC/DC conversion mode requirement, the first mode switch group and the second mode switch group are controlled to be switched off.
In an optional embodiment, the control method further comprises:
step S400: acquiring a conversion mode and a port requirement of the converter topology;
step S500: in response to the conversion mode of the converter topology being an AC/DC conversion mode, disconnecting the output port switch group and switching the output mode of the output port group to be three-phase alternating current output;
step S600: and responding to the fact that the conversion mode of the converter topology is a DC/DC conversion mode, closing the output port switch group according to the port requirement, and switching the output mode of the output port group into one-path direct current output, or switching off the output port switch group according to the port requirement, and switching the output mode of the output port group into six-path direct current output.
In an optional implementation, the control method further includes:
step S700: responding to the fact that the conversion mode of the converter topology is an AC/DC conversion mode, acquiring output level requirements of the converter topology, and controlling the power switch device group according to a preset first state switching strategy, so that the converter topology outputs preset state levels corresponding to the output level requirements through an output port group, wherein the output level requirements comprise a positive level state requirement, a zero level state requirement and a negative level state;
step S800: and responding to the fact that the conversion mode of the converter topology is a DC/DC conversion mode, obtaining the working state requirement of the converter topology, and controlling the power switch device group according to a preset second state switching strategy to enable the converter topology to be in a Boost working state or a Buck working state corresponding to the working state requirement.
It should be noted that, steps executed by the control method for a three-level ac/dc universal converter topology provided in the embodiment of the present application and related technical features correspond to those of the converter topology provided in the embodiment of the present application, and for description of the method portion, reference may be made to the embodiment of the foregoing apparatus portion, which is not described herein again.
In summary, the embodiment of the present application provides a method for controlling a topology of a three-level ac/dc universal converter, where when the method is executed, a conversion mode requirement of the topology of the converter is obtained; when the conversion mode requirement is an AC/DC conversion mode requirement, controlling the first mode selector switch group and the second mode selector switch group to be closed; and when the conversion mode requirement is a DC/DC conversion mode requirement, controlling the first mode switch group and the second mode switch group to be switched off. Therefore, the control method of the three-level alternating current-direct current universal converter topology can realize the function switching of the converter topology AC/DC and DC/DC, and realize the generalization and standardization of the three-level AC/DC and DC/DC.
In the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
Those skilled in the art will appreciate that the flowchart shown in the figure is only one example in which the embodiments of the present application can be implemented, and the application scope of the embodiments of the present application is not limited in any way by the flowchart.
In the several embodiments provided in the present application, it should be understood that the disclosed method, apparatus, and device may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of devices or units through some communication interfaces, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment. In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk, and various media capable of storing program codes.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A three-level ac-dc universal converter topology, the converter topology comprising: the power module comprises a direct current port group, a power module, a switch switching module and an output port group; wherein the content of the first and second substances,
the power module comprises a power switch device group and a corresponding anti-parallel diode, and the power module is connected to the direct current port group in a three-phase mode;
the switch switching module comprises a mode switching switch group and an output port switching switch group, the mode switching switch group is used for switching the converter topology into an AC/DC conversion mode or a DC/DC conversion mode according to a preset mode switching strategy, and the output port switching switch group is used for switching the output mode of the output port group according to the conversion mode of the converter topology and the port requirement;
the output port group comprises a first output port group and a second output port group, the first output port group and the second output port group are respectively and symmetrically connected to the power module, and the first output port group and the second output port group respectively comprise three paths of output ports.
2. The converter topology of claim 1, wherein the set of mode switches comprises a first set of mode switches and a second set of mode switches, and the set of output port switches comprises a first set of output port switches and a second set of output port switches; the first mode selector switch group is arranged in the power module, the second mode selector switch group is arranged in the output port group, the first output port selector switch group is connected with the first output port group, and the second output port selector switch group is connected with the second output port group.
3. The converter topology of claim 1, further comprising an LC filter module; wherein the filtering module is disposed between the power module and the output port group.
4. The converter topology of claim 1, wherein the set of dc ports comprises a positive bus, a zero potential bus, and a negative bus;
the converter topology further comprises a first support capacitor and a second support capacitor; the positive electrode of the first supporting capacitor is connected with the positive bus, the negative electrode of the first supporting capacitor is connected with the positive electrode of the second supporting capacitor, the negative electrode of the second supporting capacitor is connected with the negative bus, a zero potential point is arranged between the first direct current capacitor and the second direct current capacitor, and the zero potential point is positioned on the zero potential bus.
5. The converter topology of claim 1, wherein the group of mode-switching switches is configured to switch the converter topology to an AC/DC conversion mode or a DC/DC conversion mode according to a preset mode-switching strategy, comprising:
closing the first mode switch set and the second mode switch set to switch the converter topology to an AC/DC conversion mode;
and disconnecting the first mode switch group and the second mode switch group to switch the converter topology into a DC/DC conversion mode.
6. The converter topology of claim 5, wherein the output port switch set is configured to switch an output mode of the output port set according to a conversion mode of the converter topology and a port requirement, and comprises:
in response to the conversion mode of the converter topology being an AC/DC conversion mode, disconnecting the output port switch group and switching the output mode of the output port group to be three-phase alternating current output;
and responding to the conversion mode of the converter topology being a DC/DC conversion mode, switching on the output port change-over switch group according to the port requirement, and switching the output mode of the output port group to be one-way direct current output, or switching off the output port change-over switch group according to the port requirement, and switching the output mode of the output port group to be three-way bipolar direct current output or six-way direct current output.
7. The converter topology of claim 6, wherein the power module is to:
in response to the conversion mode of the converter topology being an AC/DC conversion mode, controlling the power switch device group according to a preset first state switching strategy, so that the converter topology outputs preset state levels through an output port group, wherein the preset state levels comprise a positive level state, a zero level state and a negative level state;
responding to the conversion mode of the converter topology being a DC/DC conversion mode, controlling the power switch device group according to a preset second state switching strategy, and switching the working state of the converter topology, wherein the working state of the converter topology comprises: boost operating state and Buck operating state.
8. A control method for a three-level ac-dc universal converter topology, the control method being applied to the converter topology according to any one of claims 1 to 7, the control method comprising:
acquiring a conversion mode requirement of the converter topology;
when the conversion mode requirement is an AC/DC conversion mode requirement, controlling the first mode switch group and the second mode switch group to be closed;
and when the conversion mode requirement is a DC/DC conversion mode requirement, controlling the first mode switch group and the second mode switch group to be switched off.
9. The control method according to claim 8, characterized by further comprising:
acquiring a conversion mode and a port requirement of the converter topology;
in response to the conversion mode of the converter topology being an AC/DC conversion mode, disconnecting the output port switch group and switching the output mode of the output port group to be three-phase alternating current output;
and responding to the conversion mode of the converter topology being a DC/DC conversion mode, switching on the output port change-over switch group according to the port requirement, and switching the output mode of the output port group to be one-way direct current output, or switching off the output port change-over switch group according to the port requirement, and switching the output mode of the output port group to be three-way bipolar direct current output or six-way direct current output.
10. The control method according to claim 9, characterized by further comprising:
responding to the fact that the conversion mode of the converter topology is an AC/DC conversion mode, acquiring output level requirements of the converter topology, and controlling the power switch device group according to a preset first state switching strategy, so that the converter topology outputs preset state levels corresponding to the output level requirements through an output port group, wherein the output level requirements comprise a positive level state requirement, a zero level state requirement and a negative level state;
and responding to the fact that the conversion mode of the converter topology is a DC/DC conversion mode, obtaining the working state requirement of the converter topology, and controlling the power switch device group according to a preset second state switching strategy to enable the converter topology to be in a Boost working state or a Buck working state corresponding to the working state requirement.
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