CN113285611B - Bidirectional multiport converter for multi-energy internet - Google Patents

Bidirectional multiport converter for multi-energy internet Download PDF

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Publication number
CN113285611B
CN113285611B CN202110736766.6A CN202110736766A CN113285611B CN 113285611 B CN113285611 B CN 113285611B CN 202110736766 A CN202110736766 A CN 202110736766A CN 113285611 B CN113285611 B CN 113285611B
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transformer
bridge circuit
circuit
full
bridge
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CN113285611A (en
Inventor
董梦雪
夏晨泰
蓝建宇
董宝磊
陈姝慧
朱子锐
谢伟
李阳
杨瑷玮
刘洋
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Shanghai Institute of Space Power Sources
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Shanghai Institute of Space Power Sources
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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
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33561—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having more than one ouput with independent control
    • 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
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
    • H02M3/33584—Bidirectional converters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention discloses a multiport converter for a multi-energy internet, which comprises: a multi-port full bridge circuit, a combined transformer and a resonant circuit; the multi-port full bridge circuit is connected with the combined transformer through the resonance circuit; the multi-port full-bridge circuit is used for converting the voltage between different ports in the multi-port full-bridge circuit, and the invention can intelligently interconnect the energy sources and the loads with different voltage grades in the multi-energy interconnection network system of the all-electric airplane.

Description

Bidirectional multiport converter for multi-energy internet
Technical Field
The invention relates to the technical field of power management of a full-electric airplane power supply system, in particular to a multi-port converter for a multi-energy interconnection network.
Background
The full-electric airplane power supply system is used as a core component of a full-electric airplane, and the full-electric airplane power supply system is mainly used for providing a high-quality and high-reliability continuous power supply for the airplane during the flight period and meeting the power requirement of a full-airplane power load.
The full-electric airplane power supply system generally comprises a main power supply, an auxiliary power supply, an emergency power supply and the like, and is mainly divided into an alternating current power supply system and a direct current power supply system, wherein the high-voltage direct current power supply system generally adopts 540V and 270V direct current buses, and the high-voltage direct current buses are converted into electric energy modes required by airborne equipment through secondary power supply conversion (DC/DC, DC/AC).
At present, a high-voltage direct-current power supply system of an airplane mainly adopts a distributed power supply system structure, namely, a direct-current bus is arranged in the system, secondary power supplies of different types are respectively connected with the direct-current bus to supply power for different loads, and energy transfer between the direct-current bus and the loads is realized by adopting a discrete converter.
Although each converter can be controlled independently using a separate converter, other problems arise: (1) The number of converters is large, the system structure is complex, and more space is occupied; (2) The cost of the system is increased by adding a converter and a control circuit thereof correspondingly for each source or load added in the system; (3) As the number of converters increases, the potential reliability concerns of the system also increase.
Disclosure of Invention
The invention aims to provide a multi-port converter for a multi-energy interconnection network, which is used for realizing the purpose of intelligent interconnection of energy sources and loads with different voltage levels in a multi-energy interconnection network system of an all-electric airplane.
In order to realize the purpose, the invention is realized by the following technical scheme:
a multi-port converter for a multi-energy interconnect network, comprising:
a multiport full bridge circuit, a combined transformer and a resonant circuit;
the multi-port full bridge circuit is connected with the combined transformer through the resonance circuit;
the multi-port full bridge circuit is used for converting voltages among different ports in the multi-port full bridge circuit so as to intelligently interconnect energy sources and loads with different voltage levels in a multi-energy interconnection network system of the all-electric aircraft.
Optionally, the multiport full-bridge circuit includes N single full-bridge circuits, where N > 3,N the single full-bridge circuits have the same structure, and each single full-bridge circuit includes: the four switching tubes are connected in series to form an advance bridge arm of the single full-bridge circuit, the other two switching tubes are connected in series to form a lag bridge arm of the single full-bridge circuit, and the advance bridge arm and the lag bridge arm are connected in parallel; four diodes are arranged on the upper surface of the substrate,
the diodes correspond to the switch tubes one by one, and each diode is connected in anti-parallel with two ends of the corresponding switch tube; and
four absorption capacitors;
the absorption capacitors correspond to the diodes one to one, and each absorption capacitor is connected to two ends of the corresponding diode in parallel.
Optionally, each of the diodes is a parasitic diode or an extra diode;
each absorption capacitor is a parasitic capacitor or an external capacitor.
Optionally, the resonant circuits include N groups, where N > 3, and each resonant circuit includes a resonant inductor and a blocking capacitor connected in series with each other.
Optionally, the combined transformer comprises N (N-1)/2,N > 3 low power class transformers;
wherein, the first transformer T 1 One end of the primary winding is connected with the leading bridge arm of the first single full bridge circuit 1 through a first resonance circuit, and the first transformer T 1 The other end of the primary winding is connected with a hysteresis bridge arm of the first single full-bridge circuit 1;
the first transformer T 1 One end of the secondary winding is connected with the leading bridge arm of the second single-full bridge circuit 2 through a second resonance circuit, and the transformer T 1 The other end of the secondary winding is connected with a hysteresis bridge arm of the second single full-bridge circuit 2;
a second transformer T 2 One end of the primary winding is connected with the leading bridge arm of the first single full bridge circuit 1 through a first resonance circuit, and the second transformer T 2 The other end of the primary winding is connected with a hysteresis bridge arm of the first single full-bridge circuit 1;
the second transformer T 2 One end of the secondary winding is connected with the leading bridge arm of a third single-full bridge circuit 3 through a third resonance circuit, and the second transformer T 2 The other end of the secondary winding and the hysteresis bridge arm of the third single-full-bridge circuit 3Connecting;
third transformer T 3 One end of the primary winding is connected with the leading bridge arm of the second single-full bridge circuit 2 through the second resonance circuit, and the third transformer T 3 The other end of the primary winding is connected with a hysteresis bridge arm of the second single full-bridge circuit 2;
the third transformer T 3 One end of the secondary winding is connected with the leading bridge arm of the third single-full bridge circuit 3 through the third resonance circuit, and the third transformer T 3 The other end of the secondary winding is connected with a hysteresis bridge arm of the third single full-bridge circuit 3;
and so on until the nth (n-1)/2 transformer T n(n-1)/2 One end of the primary winding is connected with a leading bridge arm of the n-1 th single full bridge circuit n-1 through the n-1 th resonant circuit, and the n (n-1)/2 th transformer T n(n-1)/2 The other end of the primary winding is connected with a hysteresis bridge arm of the (n-1) th single full-bridge circuit n-1; the n (n-1)/2 th transformer T n(n-1)/2 One end of the secondary winding is connected with a leading bridge arm of an nth single full-bridge circuit n through an nth resonance circuit, and the nth (n-1)/2 transformer T n(n-1)/2 The other end of the secondary winding is connected with a hysteresis bridge arm of the nth single full-bridge circuit n.
Optionally, one end of a filter inductor in each of the resonant circuits is connected to a corresponding transformer, the other end of the filter inductor is connected to one end of a blocking capacitor, and the other end of the blocking capacitor is connected to a leading bridge arm of a corresponding single-full bridge.
The invention has at least one of the following advantages:
the invention provides a bidirectional multiport converter for a multi-energy interconnection network, which is based on a bidirectional multiport full-bridge DC-DC converter and comprises a multiport full-bridge circuit, a combined transformer and a resonant circuit. The invention adopts a phase-shifting control mode, and can realize the forward and reverse flow of power flow by controlling the lead and lag of a phase-shifting angle; the voltage grade change between different ports can be realized by controlling the size of the phase shifting angle between the ports and the transformer transformation ratio. The modular design of the transformer is adopted, the single transformer is split into n transformer modules, and the transformer modules and the series inductor can be combined in series and parallel, so that the power processed by the single transformer module is reduced, and the design difficulty is reduced. The series-parallel connection of a plurality of transformers and inductors can improve the upper power grade limit of the whole system. The bidirectional multiport converter for the multi-energy internet has the characteristics of compact structure, small volume and mass, high-efficiency transmission and capability of realizing direct and rapid conversion of multiple electric systems, and meets the requirements of an energy system on miniaturization, high efficiency, convenience and practicability. The invention is suitable for the multi-energy interconnection network system of the full electric airplane. The multi-port converter with free energy flow is adopted in the system to realize intelligent interconnection of energy sources and loads with different voltage levels, and the number of converters in the system is reduced.
Drawings
Fig. 1 is a schematic circuit diagram of a multi-port converter for a multi-energy interconnect network according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a two-port converter for a multi-energy interconnect network according to an embodiment of the present invention;
fig. 3 is a waveform diagram illustrating the main operation of a two-port converter for a multi-energy interconnect network according to an embodiment of the present invention.
Detailed Description
The multi-port converter for a multi-energy interconnect network according to the present invention will be described in detail with reference to the accompanying drawings and embodiments. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the drawings are in a very simplified form and are all drawn to a non-precise scale for the purpose of convenience and clarity only to aid in the description of the embodiments of the invention. To make the objects, features and advantages of the present invention comprehensible, reference is made to the accompanying drawings. It should be understood that the structures, ratios, sizes, and the like shown in the drawings and described in the specification are only used for matching with the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the implementation conditions of the present invention, so that the present invention has no technical significance, and any structural modification, ratio relationship change or size adjustment should still fall within the scope of the present invention without affecting the efficacy and the achievable purpose of the present invention.
As shown in fig. 1, the present embodiment provides a multi-port converter for a multi-energy interconnect network, including:
a multi-port full bridge circuit, a combined transformer and a resonant circuit;
the multi-port full bridge circuit is connected with the combined transformer through the resonance circuit;
the combined transformer is used for connecting the resonant circuits of different single full-bridge circuits,
the resonance circuit is used for connecting the single full-bridge circuit with the corresponding transformer winding; the resonant circuit can be combined with the excitation inductance and the leakage inductance of the transformer in series-parallel connection, and soft switching of a part of full-bridge circuit is realized.
The multi-port full-bridge circuit is used for converting voltages among different ports in the multi-port full-bridge circuit so as to intelligently interconnect energy sources and loads with different voltage levels in a multi-energy-source interconnection network system of the all-electric aircraft.
Referring to fig. 1, specifically, the multi-port full-bridge circuit includes N single full-bridge circuits, where N > 3,N of the single full-bridge circuits have the same structure, and each single full-bridge circuit includes: the four switching tubes are connected in series to form an advance bridge arm of the single full-bridge circuit, the other two switching tubes are connected in series to form a lag bridge arm of the single full-bridge circuit, and the advance bridge arm and the lag bridge arm are connected in parallel; the diodes correspond to the switch tubes one by one, and each diode is connected to two ends of the corresponding switch tube in an anti-parallel mode; and four absorption capacitors; the absorption capacitors correspond to the diodes one to one, and each absorption capacitor is connected to two ends of the corresponding diode in parallel.
Each single full-bridge circuit is provided with identical power devices (the first single full-bridge circuit 1, the second single full-bridge circuit 2 and the third single full-bridge circuit 3, until the nth single full-bridge circuit n is identical, the corresponding device modelsThe parameters are identical). Wherein the nth single full bridge circuit n, n ≧ 1, includes 4 switching tubes Q n1 ～Q n4 And 4 anti-parallel diodes D of switch tubes n1 ～D n4 And 4 parallel absorption capacitors C of switch tubes n1 ～C n4 。
The leading bridge arm of the first single full-bridge circuit 1 is composed of a first switch tube Q 11 And a third switching tube Q 13 The lagging bridge arm is composed of a second switching tube Q 12 And a fourth switching tube Q 14 Are connected in series.
The leading bridge arm of the second single full-bridge circuit 2 is composed of a fifth switching tube Q 21 Seventh switch tube Q 23 The lagging bridge arm is composed of a sixth switching tube Q 22 The eighth switch tube Q 24 Are connected in series.
The leading bridge arm of the third single full-bridge circuit 3 is composed of a ninth switching tube Q 31 The eleventh switch tube Q 33 Are connected in series, and the lag bridge arm is composed of a tenth switching tube Q 32 And a twelfth switching tube Q 34 Are connected in series.
And the like until the leading bridge arm of the nth single full bridge n is switched by the 4n-3 switching tube Q n1 4n-1 switching tube Q n3 The lag bridge arm is composed of a 4n-2 switching tube Q n2 4n switching tube Q n4 Are connected in series; n is more than or equal to 1.
In the present embodiment, each of the diodes is a parasitic diode or an extra diode;
each absorption capacitor is a parasitic capacitor or an external capacitor.
Further, the resonant circuits comprise N groups, wherein N is greater than 3, and each resonant circuit comprises a resonant inductor and a blocking capacitor which are mutually connected in series.
Wherein the nth resonant circuit includes: an nth resonant inductor (filter inductor) Ln and an nth blocking capacitor C bn The n-th filter inductor L n And the (n-1) th transformer T (n-1) Is connected to one end of the secondary winding, the filter inductance L n The other end of (C) and a blocking capacitor (C) bn One end connected to the blocking capacitor C bn The other end is connected with the n Shan QuanThe leading bridge arm of the bridge circuit n is connected.
With continued reference to FIG. 1, the combination transformer T includes N (N-1)/2,N > 3 low power class transformers; wherein, the first transformer T 1 One end of the primary winding is connected with the leading bridge arm of the first single full bridge circuit 1 through a first resonance circuit, and the first transformer T 1 The other end of the primary winding is connected to the hysteresis leg of the first single full bridge circuit 1.
The first transformer T 1 One end of the secondary winding is connected with the leading bridge arm of the second single-full bridge circuit 2 through a second resonance circuit, and the transformer T 1 The other end of the secondary winding is connected to the lagging leg of the second single full bridge circuit 2.
Second transformer T 2 One end of the primary winding is connected with a leading bridge arm of the first single full-bridge circuit 1 through a first resonance circuit, and the second transformer T 2 The other end of the primary winding is connected to the hysteresis leg of the first single full-bridge circuit 1.
The second transformer T 2 One end of the secondary winding is connected with a leading bridge arm of a third single full-bridge circuit 3 through a third resonant circuit, and the second transformer T 2 The other end of the secondary winding is connected to the hysteresis leg of the third single full-bridge circuit 3.
Third transformer T 3 One end of the primary winding is connected with the leading bridge arm of the second single-full bridge circuit 2 through the second resonance circuit, and the third transformer T 3 The other end of the primary winding is connected to the hysteresis leg of the second single full bridge circuit 2.
The third transformer T 3 One end of the secondary winding is connected with the leading bridge arm of the third single-full bridge circuit 3 through the third resonance circuit, and the third transformer T 3 The other end of the secondary winding is connected to the hysteresis leg of the third single full-bridge circuit 3.
And so on until the nth (n-1)/2 transformer T n(n-1)/2 One end of the primary winding is connected with a leading bridge arm of the n-1 th single full bridge circuit n-1 through an n-1 th resonance circuit, and the n (n-1)/2 th transformer T n(n-1)/2 The other end of the primary winding is connected with a hysteresis bridge arm of the (n-1) th single full-bridge circuit n-1; the n (n-1)/2 th transformer T n(n-1)/2 One end of the secondary winding is connected with a leading bridge arm of an nth single full-bridge circuit n through an nth resonance circuit, and the nth (n-1)/2 transformer T n(n-1)/2 The other end of the secondary winding is connected with a hysteresis bridge arm of the nth single full-bridge circuit n.
That is, each single full bridge circuit is connected to (N-1) transformers. The first single full bridge circuit 1 and the first transformer T 1 To the n-1 th transformer T n-1 Are connected. The second single full bridge circuit 2 and the first transformer T 1 Is connected with the nth transformer T n To the 2N-3 th transformer T 2n-3 Are connected. The third single full bridge circuit 3 and the second transformer T 2 And an Nth transformer T n Is connected with the 2n-2 th transformer T 2n-2 Primary winding of to the 3n-6 th transformer T 3n-6 Are connected. And so on until the nth single full bridge circuit n and the nth-1 transformer T n-1 Secondary winding of (2 n-3) th transformer T 2n-3 Secondary winding of (3) th-6 th transformer T 3n-6 4n-10 th transformer T 4n-10 Up to the n (n-1)/2 th transformer T n(n-1)/2 Are connected.
One end of a filter inductor in each resonance circuit is connected with the corresponding transformer, the other end of the filter inductor is connected with one end of a blocking capacitor, and the other end of the blocking capacitor is connected with the corresponding leading bridge arm of the single-full bridge. Namely, the first resonant circuit of the first single-full-bridge circuit 1 is composed of a first resonant inductor L 1 And a first blocking capacitor C b1 The second resonance circuit of the second single-full bridge circuit 2 is composed of a second resonance inductor L 2 And a second blocking capacitor C b2 The third resonant circuit of the third single-full bridge circuit 3 is composed of a third resonant inductor L 3 And a third blocking capacitor C b3 The same holds true until the nth resonant circuit of the nth single full-bridge circuit n is formed by the nthn resonant inductor L n And an n-th blocking capacitor C bn And (4) forming.
The above-described embodiments solve the problem of interconnection between multiple energy sources of an all-electric aircraft.
Referring to fig. 2 and fig. 3, a topology of a two-port converter in a multi-port converter will be described by taking power transmission of a first port 1 and a second port 2 as an example.
FIG. 2 is a two-port converter topology structure diagram, which includes a first single full-bridge circuit 1, a second single full-bridge circuit 2, a first transformer T 1 And a first resonant circuit. The leading bridge arm of the first single full-bridge circuit 1 is composed of a first switch tube Q 11 And a third switching tube Q 13 The lagging bridge arm is composed of a second switching tube Q 12 And a fourth switching tube Q 14 Are connected in series. The leading bridge arm of the second single full-bridge circuit 2 is composed of a fifth switching tube Q 21 Seventh switch tube Q 23 The lagging bridge arm is composed of a sixth switching tube Q 22 The eighth switch tube Q 24 Are connected in series. The first resonant circuit is composed of a resonant inductor L 12 And a blocking capacitor C b12 Component, resonant inductor L 12 Is a primary side first resonant inductor L 1 And a secondary side second resonant inductor L 2 Converting the inductance to the primary side and connecting the inductance in series to obtain the inductance; blocking capacitor C b12 Is a primary side first blocking capacitor C b1 And a secondary side second blocking capacitor C b2 And the capacitors converted to the primary side are connected in series.
In some specific embodiments, the operation mode of the multi-port converter is analyzed by taking the power transmission of the first port 1 and the second port 2 in the two-port converter as an example. First switch tube Q of first single full bridge circuit 1 11 And a fourth switching tube Q 14 The driving signals are the same, and the second switch tube Q 12 And a third switching tube Q 13 The driving signals are the same, and the fifth switch tube Q of the second single-full-bridge circuit 2 21 The eighth switch tube Q 24 The sixth switching tube Q with the same driving signal 22 Seventh switch tube Q 23 The driving signals are the same, the driving signals of the switching tubes of the same bridge arm are complementary, the interval time is dead time, and the converterWhen the circuit works in the forward direction, the first switch tube Q of the first single full-bridge circuit 1 11 And a fourth switching tube Q 14 And a second switching tube Q 12 And a third switching tube Q 13 Respectively lead the fifth switch tube Q of the second single-full-bridge circuit 2 31 The eighth switch tube Q 34 And a sixth switching tube Q 32 Seventh switch tube Q 33 。
Referring to fig. 2, the power transmission of the first port 1 and the second port 2 is taken as an example to analyze the operating waveform of the two-port converter in the multi-port converter, wherein the resonant inductor L 12 Is the first resonant inductance L 1 And a second resonant inductor L 2 Equivalent to the inductance of the first port 1.
With continued reference to fig. 3, the operating mode 1: at t 0 Before the moment, the first switch tube Q of the first single full-bridge circuit 1 12 And a third switching tube Q 13 The sixth switch tube Q of the second single full bridge circuit 2 22 And a seventh switching tube Q 23 And conducting. Primary side current I L12 Is negative and flows through the first switch tube Q 12 And a third switching tube Q 13 . The secondary current flows through the sixth switching tube Q 22 And a seventh switching tube Q 23 And a diode. Power supply V 1 Output power, power supply V 2 Absorbing the power.
And (3) working mode 2: at t 0 First switch tube Q for turning off first single full bridge circuit 1 at any moment 12 And a third switching tube Q 13 At t 1 First switch tube Q of first single full bridge circuit 1 at any moment 11 And a fourth switching tube Q 14 Is a first diode D 11 And a fourth diode D 14 And naturally conducting.
Working mode 3: first switch tube Q of first single full bridge circuit 1 11 And a fourth switching tube Q 14 After conduction, I L12 From the first switching tube Q 11 And a fourth switching tube Q 14 Is a first diode D 11 And a fourth diode D 14 When the current flows through the first switch tube Q, the first switch tube Q can be switched on by zero current 11 And a fourth switching tube Q 14 . At this time, v ab ＝V 1 ，v cd ＝-V 2 And v is L ＝V 1 +KV 2 And is thus I L12 And (4) increasing linearly. To t 2 Time of day, I L12 Rising to 0. First diode D 11 And a fourth diode D 14 And naturally shutting down. In this state, the inductor releases energy to the power supply V 1 And energy source V 2 。
The working mode 4 is as follows: from t 2 Beginning of time, I L12 Is positive, from the first switch tube Q of the first single full-bridge circuit 1 11 And a fourth switching tube Q 14 Middle flow, v ab ＝V 1 . The secondary side current flows through the sixth switching tube Q 22 And a seventh switching tube Q 23 ，v cd ＝-V 2 . And v L ＝V 1 +KV 2 ,I L12 The linear rise continues. In this mode of operation 4, the power supply V 1 And a power supply V 2 And simultaneously, energy is stored in the inductor.
The working mode 5: at t 3 Turn off the sixth switching tube Q at any moment 22 And a seventh switching tube Q 23 . At t 4 Time of day, fifth diode D 21 And an eighth diode D 24 And naturally conducting.
The working mode 6 is as follows: fifth diode D 21 And an eighth diode D 24 After conduction, I L12 From the fifth diode D 21 And an eighth diode D 24 The fifth switch tube Q of the first single-full-bridge circuit 1 can be turned on at zero voltage by medium current 21 And an eighth switching tube Q 24 . At this time, v cd ＝V 2 And v is ab ＝V 1 Then v is L ＝V 1 -KV 2 ，I L12 The linear rise continues. In this mode of operation 6, the power supply V 1 Output power, power supply V 2 Absorbing the power.
t 5 After that moment the first converter starts the other half-cycle operation, which is similar to the half-cycle described above.
The bidirectional multiport converter for the multi-energy interconnection network is based on a bidirectional multiport full-bridge DC-DC converter and comprises a multiport full-bridge circuit, a combined transformer and a resonant circuit. The invention adopts a phase-shifting control mode, and can realize the forward and reverse flow of power flow by controlling the lead and lag of a phase-shifting angle; the voltage grade change between different ports can be realized by controlling the size of the phase shifting angle between the ports and the transformer transformation ratio. The modular design of the transformer is adopted, the single transformer is split into n transformer modules, and the transformer modules and the series inductor can be combined in series and parallel, so that the power processed by the single transformer module is reduced, and the design difficulty is reduced. The plurality of transformers are connected in series-parallel with the inductor, so that the upper limit of the power grade of the whole system can be improved. The bidirectional multiport converter for the multi-energy internet has the advantages of being compact in structure, small in size and quality, high in transmission efficiency, capable of achieving direct and rapid conversion of multiple electric systems, and capable of meeting requirements of an energy system on miniaturization, high efficiency, convenience and practicability.
The embodiment is suitable for the multi-energy-source internet system of the full-electric airplane. The multi-port converter with free energy flow is adopted in the system to realize intelligent interconnection of energy sources and loads with different voltage levels, and the number of the converters in the system is reduced.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element.
It should be noted that the apparatuses and methods disclosed in the embodiments herein can be implemented in other ways. The apparatus embodiments described above are merely illustrative, and for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments herein. In this regard, each block in the flowchart or block diagrams may represent a module, a program, or a portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems that perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, the functional modules in the embodiments herein may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.

Claims (1)

1. A multi-port converter for use in a multi-energy interconnect network, comprising:
a multi-port full bridge circuit, a combined transformer and a resonant circuit;
the multi-port full bridge circuit is connected with the combined transformer through the resonance circuit;
the multi-port full-bridge circuit is used for converting voltages among different ports in the multi-port full-bridge circuit so as to intelligently interconnect energy sources and loads with different voltage levels in a multi-energy interconnection network system of the all-electric airplane; the multiport full-bridge circuit includes N single full-bridge circuit, wherein N > 3,N the structure of single full-bridge circuit is the same, and each single full-bridge circuit includes: the four switching tubes are connected in series to form an advance bridge arm of the single full bridge circuit, the other two switching tubes are connected in series to form a lag bridge arm of the single full bridge circuit, and the advance bridge arm and the lag bridge arm are connected in parallel; four diodes are used as the light-emitting diodes,
the diodes correspond to the switch tubes one by one, and each diode is connected in anti-parallel with two ends of the corresponding switch tube; and
four absorption capacitors;
the absorption capacitors correspond to the diodes one to one, and each absorption capacitor is connected to two ends of the corresponding diode in parallel; each diode is a parasitic diode or an extra diode;
each absorption capacitor is a parasitic capacitor or an external capacitor; the resonant circuits comprise N groups, wherein N is more than 3, and each resonant circuit comprises a resonant inductor and a blocking capacitor which are mutually connected in series; the combined transformer comprises N (N-1)/2,N > 3 low power grade transformers;
wherein, the first transformer T 1 One end of the primary winding is connected with the leading bridge arm of the first single full bridge circuit 1 through a first resonance circuit, and the first transformer T 1 The other end of the primary winding is connected with a hysteresis bridge arm of the first single full-bridge circuit 1;
the first transformer T 1 One end of the secondary winding is connected with a leading bridge arm of a second single full bridge circuit 2 through a second resonance circuit, and the transformer T 1 The other end of the secondary winding is connected with a hysteresis bridge arm of the second single full-bridge circuit 2;
second oneTransformer T 2 One end of the primary winding is connected with a leading bridge arm of the first single full-bridge circuit 1 through a first resonance circuit, and the second transformer T 2 The other end of the primary winding is connected with a hysteresis bridge arm of the first single full-bridge circuit 1;
the second transformer T 2 One end of the secondary winding is connected with the leading bridge arm of a third single-full bridge circuit 3 through a third resonance circuit, and the second transformer T 2 The other end of the secondary winding is connected with a hysteresis bridge arm of the third single full-bridge circuit 3;
third transformer T 3 One end of the primary winding is connected with the leading bridge arm of the second single-full bridge circuit 2 through the second resonance circuit, and the third transformer T 3 The other end of the primary winding is connected with a hysteresis bridge arm of the second single full-bridge circuit 2;
the third transformer T 3 One end of the secondary winding is connected with the leading bridge arm of the third single-full bridge circuit 3 through the third resonance circuit, and the third transformer T 3 The other end of the secondary winding is connected with a hysteresis bridge arm of the third single full-bridge circuit 3;
and so on until the nth (n-1)/2 transformer T n(n-1)/2 One end of the primary winding is connected with a leading bridge arm of an n-1 th single full bridge circuit n-1 through an n-1 th resonance circuit, and the n (n-1)/2 th transformer T n(n-1)/2 The other end of the primary winding is connected with a hysteresis bridge arm of the (n-1) th single full bridge circuit n-1; the n (n-1)/2 th transformer T n(n-1)/2 One end of the secondary winding is connected with a leading bridge arm of an nth single full-bridge circuit n through an nth resonance circuit, and the nth (n-1)/2 transformer T n(n-1)/2 The other end of the secondary winding is connected with a hysteresis bridge arm of the nth single full-bridge circuit n; one end of a filter inductor in each resonance circuit is connected with the corresponding transformer, the other end of the filter inductor is connected with one end of a blocking capacitor, and the other end of the blocking capacitor is connected with the corresponding leading bridge arm of the single-full bridge.
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US9166489B2 (en) * 2009-02-27 2015-10-20 Delta Electronics (Shanghai) Co., Ltd. Layouts of multiple transformers and multiple rectifiers of interleaving converter
JP5897831B2 (en) * 2011-07-08 2016-03-30 Fdk株式会社 Series resonant converter and series resonant converter system
CN109428490B (en) * 2017-08-15 2020-10-16 台达电子企业管理（上海）有限公司 Multi-cell power conversion system
CN108306515A (en) * 2018-03-16 2018-07-20 清华大学 A kind of mixing multiport commutator transformer
WO2019199964A1 (en) * 2018-04-10 2019-10-17 University Of Maryland College Park Vehicle on-board charger for bi-directional charging of low/high voltage batteries
CN108667325A (en) * 2018-06-05 2018-10-16 浙江大学 A kind of high-gain isolated form three-level formula multiple-channel output DC-AC converters of no duty-cycle loss
WO2020096655A1 (en) * 2019-06-26 2020-05-14 Huawei Technologies Co., Ltd. Bidirectional multiple-port power conversion system and method
CN111355378A (en) * 2019-12-20 2020-06-30 深圳市高斯宝电气技术有限公司 LLC resonant DC/DC converter
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