CN212677095U - Three-port bidirectional power converter - Google Patents
Three-port bidirectional power converter Download PDFInfo
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- CN212677095U CN212677095U CN202020989412.3U CN202020989412U CN212677095U CN 212677095 U CN212677095 U CN 212677095U CN 202020989412 U CN202020989412 U CN 202020989412U CN 212677095 U CN212677095 U CN 212677095U
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Abstract
The utility model discloses a two-way power converter of three-port can realize the two-way flow of energy in same return circuit, and this converter includes: the three-phase H-bridge circuit comprises a three-phase H-bridge circuit unit, a bus capacitor, a first full-bridge network, a resonance unit and a second full-bridge network; the three-phase H-bridge circuit comprises a first bridge arm, a second bridge arm and a third bridge arm which are connected in parallel and bridged at two ends of a bus capacitor, and a first inductor, a second inductor and a third inductor which are respectively connected with the middle points of the three bridge arms, wherein the first inductor and the second inductor are connected with a first alternating current port, the third inductor and the second inductor are connected with a second alternating current port, and a first full-bridge network comprises a fourth bridge arm and a fifth bridge arm which are connected in parallel and bridged at two ends of the bus capacitor; the second full-bridge network comprises a sixth bridge arm and a seventh bridge arm which are connected in parallel, and two ends of the sixth bridge arm and the seventh bridge arm which are connected in parallel are connected with a direct-current power port; two ends of the resonance unit are respectively connected with the middle points of the two bridge arms of the first full-bridge network and the middle points of the two bridge arms of the second full-bridge network.
Description
Technical Field
The utility model relates to a power electronic technology field, in particular to three-port bidirectional power converter.
Background
In a system with hybrid power supply of alternating current and direct current electric energy sources, the power electronic conversion device is expected to enable energy to flow in two directions at each energy source port like an energy pipeline, and an alternating current and direct current hybrid energy pipeline system is formed. As shown in fig. 1, the schematic diagram of a typical AC/DC hybrid energy pipe system is composed of two AC power ports and a DC power port, where the first AC power port, the second AC power port and the DC power port are respectively coupled to a common DC bus through a first bidirectional AC/DC converter 01, a second bidirectional AC/DC converter 02 and a bidirectional DC/DC converter 03, and the common DC bus plays a role in energy buffering. Alternating current energy can flow in two directions between the first alternating current power supply port and the second alternating current power supply port, and direct current energy and alternating current energy can also flow in two directions between the direct current power supply port and the first alternating current power supply port and between the direct current power supply port and the second alternating current power supply port. In the alternating current-direct current hybrid energy pipeline system, how to skillfully construct the bidirectional AC/DC converter and the bidirectional DC/DC converter is a direction worthy of research.
Taking the construction of a bidirectional DC/DC converter in an ac/DC hybrid energy pipeline system as an example, the following methods can be used:
first, as shown in fig. 2a, two independent DC/DC converters are used, and the two DC/DC converters operate independently to respectively realize conversion from a first DC port to a second DC port and conversion from the second DC port to the first DC port;
secondly, as shown in fig. 2b, two independent DC/DC converters are merged to realize sharing of a part of devices, and when energy is converted from the first DC port to the second DC port and from the second DC port to the first DC port, respectively, energy passes through a part of common units or devices, so that the cost of the bidirectional DC-DC converter can be reduced by locally sharing the units or devices. In which, in a very extreme case, only one DC/DC converter is used, and two selection units are used, as shown in fig. 2c, and local sharing is implemented by the selection units, thereby reducing the system cost.
The alternating current-direct current hybrid energy pipeline system applying the two bidirectional DC/DC converters cannot realize bidirectional flow of energy in the same loop in the true sense.
SUMMERY OF THE UTILITY MODEL
The utility model provides a two-way power converter of three-port, above-mentioned two-way power converter of three-port can realize the two-way flow of energy in the same return circuit in the real meaning, provides different energy pipelines for using this two-way power converter's of three-port alternating current-direct current hybrid system.
The utility model provides a two-way power converter of three-port, this two-way power converter of three-port includes: the three-phase H-bridge circuit unit, the bus capacitor, the first full-bridge network, the resonance unit and the second full-bridge network are sequentially connected;
the three-phase H-bridge circuit unit comprises a first bridge arm, a second bridge arm, a third bridge arm, a first inductor, a second inductor and a third inductor, the first bridge arm comprises a first switch and a second switch which are connected in series, the second bridge arm comprises a third switch and a fourth switch which are connected in series, the third bridge arm comprises a fifth switch and a sixth switch which are connected in series, the first bridge arm, the second bridge arm and the third bridge arm are connected in parallel and are respectively bridged at two ends of the bus capacitor, the first end of the first inductor is connected with the midpoint of the first bridge arm, the first end of the second inductor is connected with the midpoint of the second bridge arm, the first end of the third inductor is connected with the midpoint of the third bridge arm, the second end of the first inductor and the second end of the second inductor are connected with a first alternating current power supply port, the second end of the third inductor and the second end of the second inductor are connected with a second alternating current power supply port;
the first full-bridge network comprises a fourth bridge arm and a fifth bridge arm, and the fourth bridge arm and the fifth bridge arm are connected in parallel and are respectively bridged at two ends of the bus capacitor;
the second full-bridge network comprises a sixth bridge arm and a seventh bridge arm which are connected in parallel, and two ends of the sixth bridge arm and the seventh bridge arm of the second full-bridge network, which are connected in parallel, are connected with a direct current power port;
the first full-bridge network and the second full-bridge network are synchronously modulated;
the input end of the resonance unit is respectively connected with the midpoint of the fourth bridge arm and the midpoint of the fifth bridge arm, and the output end of the resonance unit is respectively connected with the midpoint of the sixth bridge arm and the midpoint of the seventh bridge arm.
In a possible embodiment, the fourth leg comprises a first and a second assembly connected in series, and the fifth leg comprises a third and a fourth assembly connected in series;
the first assembly, the second assembly, the third assembly and the fourth assembly are all fully-controlled switch assemblies; alternatively, the first and second electrodes may be,
the first assembly and the second assembly are full-control switch assemblies, and the third assembly and the fourth assembly are capacitance elements; alternatively, the first and second electrodes may be,
the first assembly and the second assembly are capacitance elements, and the third assembly and the fourth assembly are full-control switch assemblies; alternatively, the first and second electrodes may be,
the first component and the third component are full-control type switch components, and the second component and the fourth component are two primary windings of the same coupling transformer; alternatively, the first and second electrodes may be,
the first component and the third component are two primary windings of the same coupling transformer, and the second component and the fourth component are full-control switch components;
the full-control type switch assembly comprises a full-control type switch device or comprises the full-control type switch device and a capacitance element which are connected in parallel.
In a possible embodiment, the sixth leg comprises a fifth assembly and a sixth assembly connected in series, the seventh leg comprises a seventh assembly and an eighth assembly connected in series;
the fifth assembly, the sixth assembly, the seventh assembly and the eighth assembly are all fully-controlled switch assemblies; alternatively, the first and second electrodes may be,
the fifth assembly and the sixth assembly are full-control type switch assemblies, and the seventh assembly and the eighth assembly are capacitance elements; alternatively, the first and second electrodes may be,
the fifth assembly and the sixth assembly are capacitance elements, and the seventh assembly and the eighth assembly are full-control switch assemblies; alternatively, the first and second electrodes may be,
the fifth component and the seventh component are full-control switch components, and the sixth component and the eighth component are two secondary windings of the same coupling transformer; alternatively, the first and second electrodes may be,
the fifth component and the seventh component are two secondary windings of the same coupling transformer, and the sixth component and the eighth component are full-control switch components.
In a possible embodiment, the resonant unit comprises a first resonant circuit comprising a first resonant inductance when a capacitive element is comprised in the first full-bridge network and/or the second full-bridge network.
In a possible embodiment, the resonant unit comprises a first resonant circuit comprising a first resonant inductance and a first resonant capacitance connected in series.
In a possible embodiment, the resonant unit further comprises an excitation inductance connected across the two branches of the first resonant circuit.
In a possible embodiment, the resonant unit further comprises a transformer, and the first resonant circuit is connected in series to a primary winding of the transformer.
In a possible embodiment, when the first full-bridge network includes two primary windings of the same coupling transformer, the two primary windings of the same coupling transformer in the first full-bridge network are the primary windings of the transformer in the resonant unit;
when the second full-bridge network comprises two secondary windings of the same coupling transformer, the two secondary windings of the same coupling transformer in the second full-bridge network are the secondary windings of the transformer in the resonance unit.
In a possible embodiment, the resonant unit further comprises a second resonant circuit connected in series to the secondary winding of the transformer in the resonant unit;
the second resonant circuit comprises a second resonant capacitor and/or a second resonant inductor.
In a possible implementation, the current sampling device is further included, and the current sampling device is respectively connected in series with the first inductor, the second inductor and the third inductor.
The utility model has the advantages that: the embodiment of the utility model provides an among the two-way power converter of three-port, first inductance and second inductance coupling are to first alternating current power supply port, second inductance and third inductance coupling are to second alternating current power supply port, the second full-bridge network couples to the direct current power supply port, first bridge arm, first inductance L1, second bridge arm and second inductance L2 constitute first bidirectional AC/DC converter, the second bridge arm is public bridge arm, the second bridge arm, second inductance L2, third bridge arm and third inductance L3 constitute second bidirectional AC/DC converter again, first full-bridge network 200, resonance unit 300 and second full-bridge network 400 constitute bidirectional DC/DC converter, first bidirectional AC/DC converter, second bidirectional AC/DC converter and bidirectional DC/DC converter all cross over in the both ends of bus-bar electric capacity. The three-port bidirectional power converter forms a three-port alternating current-direct current hybrid energy pipeline system, wherein the first bidirectional AC/DC converter, the second bidirectional AC/DC converter and the bidirectional DC/DC converter can realize bidirectional flow of energy in the same loop, and different energy pipeline systems can be provided for an alternating current-direct current hybrid power supply system applying the three-port bidirectional power converter.
Drawings
FIG. 1 is a schematic structural diagram of a hybrid AC/DC energy piping system according to the prior art;
FIGS. 2a, 2b and 2c are schematic diagrams of the structure of a prior art bidirectional DC/DC converter;
fig. 3 is a schematic structural diagram of a three-port bidirectional power converter according to an embodiment of the present invention;
fig. 4a is a schematic structural diagram of a first full-bridge network according to an embodiment of the present invention;
fig. 4b is a schematic structural diagram of a second full-bridge network according to an embodiment of the present invention;
fig. 5a, fig. 5b, fig. 5c, fig. 5d, fig. 5e, fig. 5f, fig. 5g, fig. 5h, fig. 5i and fig. 5j are schematic structural diagrams of a first full-bridge network or a second full-bridge network according to an embodiment of the present invention;
fig. 6a and fig. 6b are schematic structural diagrams of a resonance unit according to an embodiment of the present invention;
fig. 7a and fig. 7b are schematic structural diagrams of a resonance unit according to an embodiment of the present invention;
fig. 8a, fig. 8b and fig. 8c are schematic structural diagrams of a resonance unit according to an embodiment of the present invention;
fig. 9a, 9b, 9c, 9d, 9c, 9e, 9f, 9g, and 9h are schematic structural diagrams of a resonance unit according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of a three-port bidirectional power converter according to an embodiment of the present invention;
fig. 11 is a schematic structural diagram of an ac-dc hybrid power supply system according to an embodiment of the present invention;
fig. 12 is a schematic structural diagram of another three-port bidirectional power converter according to an embodiment of the present invention;
fig. 13 is a schematic structural diagram of another three-port bidirectional power converter according to an embodiment of the present invention;
fig. 14 is a schematic structural diagram of another three-port bidirectional power converter according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In order to solve the problem in the prior art, the embodiment of the utility model provides a three-port bidirectional power converter can realize the two-way flow of energy in the same return circuit in the real meaning, provides different energy pipelines for using this three-port bidirectional power converter's alternating current and direct current hybrid power supply system.
The following describes a three-port bidirectional power converter according to an embodiment of the present invention in detail with reference to the accompanying drawings and specific embodiments.
An embodiment of the utility model provides a three-port bidirectional power converter, as shown in fig. 3, this three-port bidirectional power converter includes: the three-phase H-bridge circuit comprises a three-phase H-bridge circuit unit 100, a bus capacitor C, a first full-bridge network 200, a resonance unit 300 and a second full-bridge network 400 which are connected in sequence;
the three-phase H-bridge circuit unit 100 includes a first leg, a second leg, a third leg, a first inductance L1, a second inductor L2 and a third inductor L3, the first bridge arm comprises a first switch S1 and a second switch S2 which are connected in series, the second bridge arm comprises a third switch S3 and a fourth switch S4 which are connected in series, the third bridge arm comprises a fifth switch S5 and a sixth switch S6 which are connected in series, the first bridge arm, the second bridge arm and the third bridge arm are connected in parallel and respectively bridged at two ends of a bus capacitor C, a first end of the first inductor L1 is connected with a midpoint of the first bridge arm, a first end of the second inductor L2 is connected with a midpoint of the second bridge arm, a first end of the third inductor L3 is connected with a midpoint of the third bridge arm, a second end of the first inductor L1 and a second end of the second inductor L2 are connected with a first alternating current power supply port, and a second end of the third inductor L3 and a second end of the second inductor L2 are connected with a second alternating current power supply port; specifically, the midpoint of the first bridge arm is a series connection point of a first switch and a second switch, and the midpoint of the second bridge arm is a series connection point of a third switch and a fourth switch;
the first full-bridge network 200 includes a fourth bridge arm and a fifth bridge arm, which are connected in parallel and respectively bridged across two ends of the bus capacitor C;
the second full-bridge network 400 includes a sixth bridge arm and a seventh bridge arm connected in parallel, and both ends of the sixth bridge arm and the seventh bridge arm of the second full-bridge network 200 connected in parallel are connected to the dc power supply port;
the first full-bridge network and the second full-bridge network are synchronously modulated;
the input end of the resonance unit 300 is connected with the midpoint of the fourth bridge arm and the midpoint of the fifth bridge arm, respectively, and the output end of the resonance unit 300 is connected with the midpoint of the sixth bridge arm and the midpoint of the seventh bridge arm, respectively.
In a specific embodiment, the ac-dc hybrid power supply system employs the three-port bidirectional power converter, specifically, the three-port bidirectional power converter has a second terminal of the first inductor L1 and a second terminal of the second inductor L2 coupled to the first ac power port, a second terminal of the second inductor L2 and a second terminal of the third inductor L3 coupled to the second ac power port, and two parallel-connected terminals of the sixth leg and the seventh leg of the second full-bridge network 400 are coupled to the dc power port, and the three-port bidirectional power converter forms a three-port ac-dc hybrid energy pipe system.
In the three-port bidirectional power converter provided in the embodiment of the present invention, the three-phase H-bridge circuit unit 100 may form two bidirectional AC/DC converters, specifically, the first bridge arm, the first inductor L1, the second bridge arm, and the second inductor L2 form a first full-bridge rectifier/inverter, the second bridge arm is a common bridge arm, and the third bridge arm, the third inductor L3, the second bridge arm, and the second inductor L2 form a second full-bridge rectifier/inverter; when the three-port bidirectional power converter normally works, the first full-bridge rectifier/inverter and the second full-bridge rectifier/inverter can both adopt a unipolar modulation mode, and can both use the second bridge arm as a power frequency conduction bridge arm; the third switch S3 and the fourth switch S4 are in power frequency complementary conduction to clamp the first end voltage of the second inductor L2 to one end or the other end potential of the bus capacitor C, the first switch S1 and the second switch S2 are also in high-frequency complementary conduction after being modulated according to sine wave signals, and the first full-bridge rectifier/inverter forms a first bidirectional AC/DC converter; meanwhile, the third switch S3 and the fourth switch S4 are in power frequency complementary conduction, one end voltage of the second inductor L2 is clamped to one end or the other end potential of the bus capacitor C, the fifth switch S5 and the sixth switch S6 are modulated according to sine wave signals and then are in high frequency complementary conduction, and the second full-bridge rectifier/inverter forms the second bidirectional AC/DC converter.
In the three-port bidirectional power converter provided by the embodiment of the present invention, the first full-bridge network 200, the resonant unit 300, and the second full-bridge network 400 may form a bidirectional DC/DC converter, and specifically, when the first full-bridge network 200 and the second full-bridge network 400 are modulated in a synchronous modulation mode, the first full-bridge network 200 and the second full-bridge network 400 maintain a synchronous on-time in a high frequency switching period, during the on-time, the DC side voltage of the first full-bridge network 200 is coupled to the input terminal of the resonant unit 300 to form a voltage V1, the DC side voltage of the second full-bridge network 400 is coupled to the output terminal of the resonant unit 300 to form a voltage V2, the resonant unit 300 is an inductive element or a combination of an inductive element and a capacitive element, and its high frequency characteristic shows a certain impedance characteristic, and a certain voltage difference is formed between the two terminals of the resonant unit 300 by the voltage V1 and the voltage V2, the direction of the average current flowing through the resonance unit 300 is determined according to the positive and negative of the voltage difference, and the high-frequency impedance characteristic of the resonance unit 300 can limit the current to rapidly rise so as to avoid the current from being out of control. Therefore, the energy conversion direction of the bidirectional DC/DC converter formed by the first full-bridge network 200, the resonant unit 300 and the second full-bridge network 400 can be automatically adjusted according to the change of the external DC side voltage, so that energy can flow in the same loop in two directions in the true sense, as in an energy pipeline.
In a specific embodiment, the first full-bridge network 200, the resonant unit 300 and the second full-bridge network 400 form a bidirectional DC/DC converter, the first bidirectional AC/DC converter and/or the second bidirectional AC/DC converter is/are further superimposed with the bidirectional DC/DC converter, the finally formed functional unit is still the bidirectional AC/DC converter, and the purpose of isolation, voltage matching and the like can be realized by adding the bidirectional DC/DC converter.
In the three-port bidirectional power converter, a first inductor and a second inductor are coupled to a first alternating current power supply port, a second inductor and a third inductor are coupled to a second alternating current power supply port, a second full-bridge network is coupled to a direct current power supply port, the first bridge arm, the first inductor L1, the second bridge arm and the second inductor L2 form a first bidirectional AC/DC converter, the second bridge arm is a common bridge arm, the second inductor L2, the third bridge arm and the third inductor L3 form a second bidirectional AC/DC converter, the first full-bridge network 200, the resonance unit 300 and the second full-bridge network 400 form a bidirectional DC/DC converter, and the first bidirectional AC/DC converter, the second bidirectional AC/DC converter and the bidirectional DC/DC converter are connected across two ends of a bus capacitor. The three-port bidirectional power converter forms a three-port alternating current-direct current hybrid energy pipeline system, wherein the first bidirectional AC/DC converter, the second bidirectional AC/DC converter and the bidirectional DC/DC converter can realize bidirectional flow of energy in the same loop, and different energy pipeline systems can be provided for an alternating current-direct current hybrid power supply system applying the three-port bidirectional power converter.
In a specific embodiment, the first switch S1, the second switch S2, the third switch S3, the fourth switch S4, the fifth switch S5 and the sixth switch S6 are all fully-controlled switching devices. For example, a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) or an Insulated Gate Bipolar Transistor (IGBT) may be used.
In the above embodiment of the present invention, the first full-bridge network 200 is configured as shown in fig. 4a, the fourth bridge arm includes a first component ZJ1 and a second component ZJ2 connected in series, the fifth bridge arm includes a third component ZJ3 and a fourth component ZJ4 connected in series, the midpoint of the fourth bridge arm is the series point of the first component ZJ1 and the second component ZJ2, and the midpoint of the fifth bridge arm is the series point of the third component ZJ3 and the fourth component ZJ4, and the first full-bridge network 200 may have the following specific embodiments:
the first method is as follows: the first assembly ZJ1, the second assembly ZJ2, the third assembly ZJ3 and the fourth assembly ZJ4 are all fully-controlled switch assemblies, as shown in FIGS. 5a and 5 b.
In a specific implementation, the fully-controlled switching assembly includes a fully-controlled switching device, or includes a fully-controlled switching device and a capacitor element connected in parallel, as shown in fig. 5a and 5 b.
The second method comprises the following steps: the first assembly ZJ1 and the second assembly ZJ2 are fully-controlled switch assemblies, and the third assembly ZJ3 and the fourth assembly ZJ4 are capacitance elements, as shown in FIGS. 5c and 5 d; alternatively, the first and second assemblies ZJ1 and ZJ2 are capacitive elements and the third and fourth assemblies ZJ3 and ZJ4 are fully-controlled switch assemblies, as shown in fig. 5e and 5 f.
The third method comprises the following steps: the first component ZJ1 and the third component ZJ3 are fully-controlled switch components, and the second component ZJ2 and the fourth component ZJ4 are two primary windings of the same coupling transformer, as shown in fig. 5g and 5 h; alternatively, the first and third assemblies ZJ1 and ZJ3 are two primary windings of the same coupling transformer, and the second and fourth assemblies ZJ2 and ZJ4 are fully-controlled switching assemblies, as shown in fig. 5i and 5 j.
It should be noted that the relative positions of the first module ZJ1, the second module ZJ2, the third module ZJ3 and the fourth module ZJ4 are only for convenience of description of the technical solution, and the positions of the first module ZJ1, the second module ZJ2, the third module ZJ3 and the fourth module ZJ4 are interchanged, and the positions of the first module ZJ1, the second module ZJ2, the third module ZJ3 and the fourth module ZJ4 are interchanged as a whole, and do not affect the structure of the circuit, which falls within the protection scope of the present invention.
In practical applications, the first full-bridge network 200 may be configured according to one of the three embodiments, which is not limited herein.
In the above embodiment of the present invention, the second full-bridge network 400 is configured as shown in fig. 4b, the sixth bridge arm includes the fifth module ZJ5 and the sixth module ZJ6 connected in series, the seventh bridge arm includes the seventh module ZJ7 and the eighth module ZJ8 connected in series, the midpoint of the seventh bridge arm is the series point of the fifth module ZJ5 and the sixth module ZJ6, the eighth bridge arm is the series point of the seventh module ZJ7 and the eighth module ZJ8, and the second full-bridge network 400 can have the following specific implementation manners:
the first method is as follows: the fifth module ZJ5, the sixth module ZJ6, the seventh module ZJ7 and the eighth module ZJ8 are all fully-controlled switch modules, as shown in FIG. 5a and FIG. 5 b; in a specific embodiment, the fully-controlled switching assembly includes a fully-controlled switching device, or includes a fully-controlled switching device and a capacitor element connected in parallel, as shown in fig. 5a and 5 b.
The second method comprises the following steps: the fifth assembly ZJ5 and the sixth assembly ZJ6 are fully-controlled switch assemblies, the seventh assembly ZJ7 and the eighth assembly ZJ8 are capacitive elements, as shown in FIGS. 5c and 5 d; alternatively, the fifth assembly ZJ5 and the sixth assembly ZJ6 are capacitive elements and the seventh assembly ZJ7 and the eighth assembly ZJ8 are fully-controlled switching assemblies, as shown in fig. 5e and 5 f.
The third method comprises the following steps: the fifth assembly ZJ5 and the seventh assembly ZJ7 are full-control type switch assemblies, and the sixth assembly ZJ6 and the eighth assembly ZJ8 are two secondary windings of the same coupling transformer, as shown in FIGS. 5g and 5 h; alternatively, the fifth assembly ZJ5 and the seventh assembly ZJ7 are two secondary windings of the same coupling transformer, and the sixth assembly ZJ6 and the eighth assembly ZJ8 are fully-controlled switching assemblies, as shown in fig. 5i and 5 j.
It should be noted that the relative positions of the fifth module ZJ5, the sixth module ZJ6, the seventh module ZJ7 and the eighth module ZJ8 are only for convenience of description of the technical solution, the positions of the fifth module ZJ5, the sixth module ZJ6, the seventh module ZJ7 and the eighth module ZJ8 are interchanged, and the positions of the fifth module ZJ5, the sixth module ZJ6, the seventh module ZJ7 and the eighth module ZJ8 are interchanged as a whole, and do not affect the structure of the circuit, which falls within the protection scope of the present invention.
In practical applications, the second full-bridge network 400 can be configured according to one of the three embodiments, which is not limited herein.
In the three-port bidirectional power converter, the first full-bridge network 200 and the second full-bridge network 400 are controlled by adopting a synchronous modulation mode, in a specific embodiment, when the first module ZJ1 to the eighth module ZJ8 are all fully-controlled switch modules, the legs of the first full-bridge network 200 and the second full-bridge network 400 are controlled by using complementary driving signals, the first module ZJ1 of the first full-bridge network 200 is completely synchronous with at least the driving signals of the fifth module ZJ5 or the sixth module ZJ6 of the second full-bridge network 400, and the legs of the first full-bridge network 200 and the second full-bridge network 400 are respectively provided with dead time.
The three-port bidirectional power converter, specifically, the first full-bridge network 200 and the second full-bridge network 400 may simultaneously adopt a PFM mode with a fixed duty cycle and an adjustable frequency for synchronous modulation; or, the first full-bridge network 200 and the second full-bridge network 400 may also simultaneously perform synchronous modulation by using a PWM mode with fixed frequency and adjustable duty cycle;
in one possible embodiment, the first full-bridge network 200 and the second full-bridge network 400 are controlled by a set of driving signals with 50% complementary duty cycles, specifically, when the first module ZJ1 to the eighth module ZJ8 are all fully-controlled switch modules, the first module ZJ1, the fourth module ZJ4 of the first full-bridge network 200 and the fifth module ZJ5 and the eighth module ZJ8 of the second full-bridge network 400 are controlled by driving signals of the same source, and the second module ZJ2, the third module ZJ3 of the first full-bridge network 200 and the sixth module ZJ6 and the seventh module ZJ7 of the second full-bridge network 400 are controlled by signals complementary to the driving signals.
Above-mentioned in the embodiment of the utility model, specifically, resonant unit 300 can include first resonant circuit, first resonant circuit includes first resonance inductance Lr1 and first resonance electric capacity Cr1 of establishing ties, as shown in fig. 6a, first resonance electric capacity Cr1 and first resonance inductance Lr1 constitute resonant network, provide the condition that zero voltage opened or zero current was shut off for the full accuse type switching device in first full-bridge network 200 and the second full-bridge network 400, produce the soft switching effect, switching loss has been reduced, the conversion efficiency of two-way DC/DC converter has been improved.
In a specific implementation, when the first full-bridge network 200 and/or the second full-bridge network 400 include/includes capacitive elements, for example, the first module ZJ1 and the second module ZJ2 are fully-controlled switching components, and the third module ZJ3 and the fourth module ZJ4 are capacitive elements, or when the fully-controlled switching components include fully-controlled switching devices and capacitive elements connected in parallel, the first resonant circuit may only include the first resonant inductor Lr1, as shown in fig. 6b, the capacitive elements in the first full-bridge network 200 and/or the second full-bridge network 400 and the first resonant inductor Lr1 form a resonant network, and a zero-voltage turn-on condition is created during turn-on of the fully-controlled switching devices in the first full-bridge network 200 and the second full-bridge network 400, or a zero-current turn-off condition is created during turn-on of the fully-controlled switching devices in the first full-bridge network 200 and the second full-bridge network 400, so as to generate a soft switching effect, the switching loss is reduced, and the conversion efficiency of the bidirectional DC/DC converter is improved.
In a specific implementation, the resonant unit 300 further includes a magnetizing inductance Lm connected across two branches of the first resonant circuit, as shown in fig. 7a and 7b, and the impedance characteristic curve of the resonant cavity can be changed by increasing the magnetizing inductance Lm, so as to change the gain curve of the resonant unit 300.
In a possible embodiment, the resonant unit 300 further includes a transformer T, and the first resonant circuit is connected in series to the primary winding of the transformer T, as shown in fig. 8a and 8b, the resonant unit 300 can achieve high frequency isolation, and the energy of the resonant cavity is transferred through the transformer T, which can increase the voltage range of the dc port. Specifically, the transformer T is designed according to a preset turn ratio, and the voltage amplitudes at both ends of the transformer T can be matched. In a particular embodiment, the transformer T may be an isolation transformer.
In a specific implementation, when the first full-bridge network 200 includes two primary windings of the same coupling transformer, the two primary windings of the same coupling transformer in the first full-bridge network 200 are the primary windings of the transformer T in the resonance unit 300; when the second full-bridge network 400 includes two secondary windings of the same coupling transformer, the two secondary windings of the same coupling transformer T in the second full-bridge network 400 are the secondary windings of the transformer T in the resonant unit 300.
In a specific implementation, when the resonant unit 300 includes a transformer T, the first resonant circuit is connected in series to the primary winding of the transformer T, and the magnetizing inductance Lm is connected in parallel to two ends of the primary winding of the transformer T, as shown in fig. 8 c.
In a possible embodiment, when the resonant unit 300 comprises a transformer T, the resonant unit 300 further comprises a second resonant circuit, which is connected in series to the secondary winding of the transformer T; the second resonant circuit comprises a second resonant capacitor Cr2 and/or a second resonant inductor Lr2 as shown in fig. 9a, 9b and 9 c. In a specific embodiment, the resonance unit 300 may be composed of a first resonance circuit, an excitation inductance Lm, a transformer T, a second resonance circuit, as shown in fig. 9 d; alternatively, the resonance unit 300 may be composed of a first resonance circuit, a transformer T, and a second resonance circuit, as shown in fig. 9e, 9f, 9g, and 9 h.
The inductance element and the capacitance element on both sides of the transformer T may be always equivalent to one side of the transformer T, and the inductance element and the capacitance element on the opposite side of the transformer T may also be equivalent to both sides of the transformer T.
In a possible embodiment, the three-port bidirectional power converter further includes a current sampling device Sam, as shown in fig. 10, the current sampling device may be a hall current sampling device, a current transformer, or a shunt, and the current sampling device is respectively connected in series with the first inductor L1, the second inductor L2, and the third inductor L3, so as to collect, detect, and observe the current.
In practical applications, the energy pipeline system is widely applied, for example, the first ac power port is connected to the utility power, the second ac power port is connected to a load with an energy feedback system, such as a motor load, and the first dc port is connected to the dc energy storage device. In another application, the first alternating current power supply port is connected to the mains supply, the second alternating current power supply port is connected to another path of alternating current power supply (wind power generation, an oil engine and an uninterruptible power supply), and the first direct current power supply port is connected with the direct current energy storage device; when the second alternating current power supply port is connected to the wind power generation device, a micro-grid power generation system can be formed; when the second alternating current power supply port is connected to the oil engine device, a starting and generating device shared by alternating current and direct current can be formed; when the second alternating current power supply port is connected to the uninterruptible power supply device, a stable and reliable direct current power supply device can be formed at the first direct current power supply port. Therefore, the ac/dc hybrid bidirectional energy piping system has a wide range of applications depending on the devices to which each port is coupled.
The embodiment of the utility model provides an above-mentioned three-port bidirectional power converter, it is different according to the power type of second alternating current power supply port coupling, provide different energy pipe system.
In a possible embodiment, as shown in fig. 3, in the three-port bidirectional power converter, the first ac power port is coupled to the commercial power, the second ac power port is coupled to the second ac source, and the dc power port is coupled to the dc energy storage device, that is, the second end of the first inductor L1 is coupled to the first live line L of the commercial power, and the third inductor L3 is coupled to the second ac source, since the second bridge arm is a common bridge arm, the second end of the second inductor L2 is coupled to the commercial power and the null line N of the second ac source, and two parallel ends of the sixth bridge arm and the seventh bridge arm in the second full-bridge network 400 are coupled to the dc energy storage device, the commercial power and the second ac source can simultaneously provide energy for the dc energy storage device; under the condition of mains supply outage, the second alternating current source and the direct current energy storage device can jointly supply power to the load connected to the mains supply side according to the preset energy distribution proportion.
In another possible embodiment, as shown in fig. 11, in the three-port bidirectional power converter, the second ac power port may also be coupled to an energy feedback type load, that is, the second end of the first inductor L1 is coupled to the first live line L of the commercial power, the second end of the third inductor L3 is coupled to the energy feedback type load, the second end of the second inductor L2 is coupled to the commercial power and the zero line N of the second ac source, the commercial power and the dc energy storage device may be combined to provide energy for the energy feedback type load at the same time, and when the energy is fed back by the energy feedback type load, the energy may be fed back to the dc energy storage device or the commercial power according to a predetermined condition, or fed back to the commercial power and the dc energy storage device at the same time;
several embodiments of a three-port bidirectional power converter are described in detail below.
In one possible embodiment, as shown in fig. 12, in the three-port bidirectional power converter, the first component ZJ1, the second component ZJ2, the third component ZJ3, and the fourth component ZJ4 in the first full-bridge network 200 are respectively a seventh switch S7, an eighth switch S8, a ninth switch S9, and a tenth switch S10, the resonant unit 300 includes a first resonant inductor Lr1, a first resonant capacitor Cr1, an excitation inductor Lm, a transformer T, the fifth component ZJ5, the sixth component ZJ6, the seventh component ZJ7, and the eighth component ZJ8 in the second full-bridge network 400 are respectively an eleventh switch S11, a twelfth switch S12, a thirteenth switch S9, and a fourteenth switch S6862, a seventh switch S7, a tenth switch S10, an eleventh switch S11, and a fourteenth switch S14, and the eighth switch S14 is controlled synchronously with the seventh switch S8, the tenth switch S8658, the tenth switch S14 is controlled synchronously with the high frequency modulation time of the eighth switch S7, the switch S72, the switch is controlled synchronously with the high frequency modulation time of the high frequency modulation, The ninth switch S9 uses complementary driving signals and sets a dead time, and the eleventh switch S11, the fourteenth switch S14 and the twelfth switch S12, the thirteenth switch S13 use complementary driving signals and set a dead time. In this embodiment the first resonant inductor Lr1 and the first resonant capacitor Cr1 are not in adjacent series connection, but if the current flows completely through the series circuit the interchange of the device positions in the series circuit has no effect.
Wherein, the first full-bridge network 200 and the second full-bridge network 400 are controlled according to a synchronous modulation mode, and during a high-frequency synchronous on-time, the voltage on the dc side of the first full-bridge network 200 coupled to the resonant unit 300 is V1, and the voltage on the dc side of the second full-bridge network 400 coupled to the other side of the resonant unit 300 is V2, if the transformation ratio of the transformer TT is N: 1, when V1 is greater than nxv 2, the operating state of the first full-bridge network 200 is equivalent to a full-bridge chopping mode, the operating state of the second full-bridge network 400 is equivalent to a full-bridge rectification mode, and the flowing direction of active energy is from the first full-bridge network 200 to the second full-bridge network 400; when V1 is less than nxv 2; the first full-bridge network 200 is equivalent to a full-bridge rectification mode, the second full-bridge network 400 is equivalent to a full-bridge chopping mode, and the flowing direction of active energy is from the second full-bridge network 400 to the first full-bridge network 200; when V1 equals nxv 2; the average active energy between the first full-bridge network 200 and the second full-bridge network 400 is zero.
In one possible implementation, as shown in fig. 13, in the three-port bidirectional power converter, the first component ZJ1, the second component ZJ2, the third component ZJ3 and the fourth component ZJ4 in the first full-bridge network 200 are respectively a seventh switch S7, an eighth switch S8, a first capacitor C1 and a second capacitor C2, and the fifth component ZJ5, the sixth component ZJ6, the seventh component ZJ7 and the eighth component ZJ8 in the second full-bridge network 400 are respectively an eleventh switch S11, a twelfth switch S12, a thirteenth switch S13 and a fourteenth switch S14. The first resonant inductor Lr1, the first capacitor C1 of the first full-bridge network 200, and the second capacitor C2 form a series resonance. The first full-bridge network 200 and the second full-bridge network 400 are controlled according to a synchronous modulation mode, during a high-frequency synchronous on-time, the voltage on the dc side of the first full-bridge network 200 coupled to the resonant cell 300 is V1, the voltage on the dc side of the second full-bridge network 400 coupled to the other side of the resonant cell 300 is V2, and if the transformation ratio of the transformer TT is N: 1, when V1 is greater than nxv 2, the operation state of the first full-bridge network 200 is equivalent to a half-bridge chopping mode, the operation state of the second full-bridge network 400 is equivalent to a full-bridge rectification mode, and the flowing direction of active energy is from the first full-bridge network 200 to the second full-bridge network 400; when V1 is smaller than nxv 2, the operation state of the first full-bridge network 200 is equivalent to the voltage-doubling rectifying state, the operation state of the second full-bridge network 400 is equivalent to the full-bridge rectifying mode, and the flowing direction of the active energy is from the second full-bridge network 400 to the first full-bridge network 200.
In a possible embodiment, as shown in fig. 14, in the three-port bidirectional power converter, the first component ZJ1, the second component ZJ2, the third component ZJ3 and the fourth component ZJ4 in the first full-bridge network 200 are fully-controlled switch components respectively, the fully-controlled switch components include fully-controlled switch devices and capacitor elements connected in parallel, that is, the first full-bridge network 200 includes a seventh switch S7, an eighth switch S8, a ninth switch S9, a tenth switch S10, a first capacitor C1, a second capacitor C2, a third capacitor C3 and a fourth capacitor C4, the first capacitor C1, the second capacitor C2, the third capacitor C3, the fourth capacitor C4 in the first full-bridge component and the first resonant inductor l1 in the resonant unit 300 form a series resonant unit, the resonant unit 300 includes a three-winding transformer T, the first winding serves as a primary winding of the transformer T, the second winding of the third winding T and the secondary winding of the third winding of the resonant unit T, the second and third windings are in turn shared with the sixth and eighth modules ZJ6, ZJ8, respectively, of the second full-bridge network 400, and in particular the fifth, sixth, seventh and eighth modules ZJ5, ZJ6, ZJ7, ZJ8, respectively, of the second full-bridge network 400 are the eleventh switch S11, the second, twelfth and third windings of the transformer T. According to the above similar analysis method, the two operating states of the first full-bridge network 200 may be respectively equivalent to a full-bridge chopping mode and a double full-bridge rectification state, and the two operating states of the second full-bridge network 400 may be respectively equivalent to a push-pull chopping mode and a full-wave rectification mode.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.
Claims (16)
1. A three-port bidirectional power converter is characterized by comprising a three-phase H-bridge circuit unit, a bus capacitor, a first full-bridge network, a resonance unit and a second full-bridge network which are sequentially connected;
the three-phase H-bridge circuit unit comprises a first bridge arm, a second bridge arm, a third bridge arm, a first inductor, a second inductor and a third inductor, the first bridge arm comprises a first switch and a second switch which are connected in series, the second bridge arm comprises a third switch and a fourth switch which are connected in series, the third bridge arm comprises a fifth switch and a sixth switch which are connected in series, the first bridge arm, the second bridge arm and the third bridge arm are connected in parallel and are respectively bridged at two ends of the bus capacitor, the first end of the first inductor is connected with the midpoint of the first bridge arm, the first end of the second inductor is connected with the midpoint of the second bridge arm, the first end of the third inductor is connected with the midpoint of the third bridge arm, the second end of the first inductor and the second end of the second inductor are connected with a first alternating current power supply port, the second end of the third inductor and the second end of the second inductor are connected with a second alternating current power supply port;
the first full-bridge network comprises a fourth bridge arm and a fifth bridge arm, and the fourth bridge arm and the fifth bridge arm are connected in parallel and are respectively bridged at two ends of the bus capacitor;
the second full-bridge network comprises a sixth bridge arm and a seventh bridge arm which are connected in parallel, and two ends of the sixth bridge arm and the seventh bridge arm of the second full-bridge network, which are connected in parallel, are connected with a direct current power port;
the first full-bridge network and the second full-bridge network are synchronously modulated;
the input end of the resonance unit is respectively connected with the midpoint of the fourth bridge arm and the midpoint of the fifth bridge arm, and the output end of the resonance unit is respectively connected with the midpoint of the sixth bridge arm and the midpoint of the seventh bridge arm.
2. The three-port bidirectional power converter of claim 1, wherein said fourth leg comprises a first component and a second component connected in series, and said fifth leg comprises a third component and a fourth component connected in series;
the first assembly, the second assembly, the third assembly and the fourth assembly are all fully-controlled switch assemblies; alternatively, the first and second electrodes may be,
the first assembly and the second assembly are full-control switch assemblies, and the third assembly and the fourth assembly are capacitance elements; alternatively, the first and second electrodes may be,
the first assembly and the second assembly are capacitance elements, and the third assembly and the fourth assembly are full-control switch assemblies; alternatively, the first and second electrodes may be,
the first component and the third component are full-control type switch components, and the second component and the fourth component are two primary windings of the same coupling transformer; alternatively, the first and second electrodes may be,
the first component and the third component are two primary windings of the same coupling transformer, and the second component and the fourth component are full-control switch components;
the full-control type switch assembly comprises a full-control type switch device or comprises the full-control type switch device and a capacitance element which are connected in parallel.
3. The three-port bidirectional power converter of claim 2, wherein said sixth leg comprises a fifth component and a sixth component connected in series, and said seventh leg comprises a seventh component and an eighth component connected in series;
the fifth assembly, the sixth assembly, the seventh assembly and the eighth assembly are all fully-controlled switch assemblies; alternatively, the first and second electrodes may be,
the fifth assembly and the sixth assembly are full-control type switch assemblies, and the seventh assembly and the eighth assembly are capacitance elements; alternatively, the first and second electrodes may be,
the fifth assembly and the sixth assembly are capacitance elements, and the seventh assembly and the eighth assembly are full-control switch assemblies; alternatively, the first and second electrodes may be,
the fifth component and the seventh component are full-control switch components, and the sixth component and the eighth component are two secondary windings of the same coupling transformer; alternatively, the first and second electrodes may be,
the fifth component and the seventh component are two secondary windings of the same coupling transformer, and the sixth component and the eighth component are full-control switch components.
4. The three-port bidirectional power converter according to any of claims 1-3, wherein the resonant unit comprises a first resonant circuit comprising a first resonant inductance when a capacitive element is included in the first full-bridge network and/or the second full-bridge network.
5. The three-port bidirectional power converter of claim 4, wherein said resonant unit further comprises an excitation inductor connected across two legs of said first resonant circuit.
6. The three-port bidirectional power converter of claim 4, wherein said resonant cell further comprises a transformer, said first resonant circuit being connected in series on a primary winding of said transformer.
7. The three-port bidirectional power converter of claim 6, wherein said resonant cell further comprises a second resonant circuit connected in series with a secondary winding of a transformer in said resonant cell;
the second resonant circuit comprises a second resonant capacitor and/or a second resonant inductor.
8. The three-port bidirectional power converter of claim 6,
when the first full-bridge network comprises two primary windings of the same coupling transformer, the two primary windings of the same coupling transformer in the first full-bridge network are the primary windings of the transformer in the resonance unit;
when the second full-bridge network comprises two secondary windings of the same coupling transformer, the two secondary windings of the same coupling transformer in the second full-bridge network are the secondary windings of the transformer in the resonance unit.
9. The three-port bidirectional power converter of claim 8, wherein said resonant cell further comprises a second resonant circuit connected in series with a secondary winding of a transformer in said resonant cell;
the second resonant circuit comprises a second resonant capacitor and/or a second resonant inductor.
10. The three-port bidirectional power converter according to any of claims 1-3, wherein the resonant unit comprises a first resonant circuit comprising a first resonant inductor and a first resonant capacitor connected in series.
11. The three-port bidirectional power converter of claim 10, wherein said resonant unit further comprises an excitation inductor connected across two legs of said first resonant circuit.
12. The three-port bidirectional power converter of claim 10, wherein said resonant cell further comprises a transformer, said first resonant circuit being connected in series on a primary winding of said transformer.
13. The three-port bidirectional power converter of claim 12, wherein said resonant cell further comprises a second resonant circuit connected in series with a secondary winding of a transformer in said resonant cell;
the second resonant circuit comprises a second resonant capacitor and/or a second resonant inductor.
14. The three-port bidirectional power converter of claim 12,
when the first full-bridge network comprises two primary windings of the same coupling transformer, the two primary windings of the same coupling transformer in the first full-bridge network are the primary windings of the transformer in the resonance unit;
when the second full-bridge network comprises two secondary windings of the same coupling transformer, the two secondary windings of the same coupling transformer in the second full-bridge network are the secondary windings of the transformer in the resonance unit.
15. The three-port bidirectional power converter of claim 14, wherein said resonant cell further comprises a second resonant circuit connected in series with a secondary winding of a transformer in said resonant cell;
the second resonant circuit comprises a second resonant capacitor and/or a second resonant inductor.
16. The three-port bidirectional power converter of claim 1 further comprising current sampling devices respectively connected in series with said first, second and third inductors.
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| CN115664247A (en) * | 2022-11-04 | 2023-01-31 | 惠州市乐亿通科技有限公司 | Bidirectional split-phase three-bridge-arm inverter circuit and modulation method |
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| CN115664247A (en) * | 2022-11-04 | 2023-01-31 | 惠州市乐亿通科技有限公司 | Bidirectional split-phase three-bridge-arm inverter circuit and modulation method |
| CN115664247B (en) * | 2022-11-04 | 2023-08-18 | 惠州市乐亿通科技有限公司 | Bidirectional split-phase three-bridge arm inverter circuit and modulation method |
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