CN108832825B - High power density's multiport power electronic transformer topology - Google Patents
High power density's multiport power electronic transformer topology Download PDFInfo
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- CN108832825B CN108832825B CN201810736782.3A CN201810736782A CN108832825B CN 108832825 B CN108832825 B CN 108832825B CN 201810736782 A CN201810736782 A CN 201810736782A CN 108832825 B CN108832825 B CN 108832825B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/219—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J5/00—Circuit arrangements for transfer of electric power between ac networks and dc networks
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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
- H02M3/33569—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
Abstract
The invention discloses a high-power-density multi-port power electronic transformer topology, which comprises a modular multilevel converter at a high-voltage side, a resonant high-frequency converter at a middle side and a direct-current bus at a low-voltage side, wherein the modular multilevel converter is connected with a power supply; positive and negative direct current buses of the modular multilevel converter are respectively connected with two DC blocking resonant capacitors of the high-frequency converter, and an alternating current bus of the modular multilevel converter is connected with an alternating current resonant capacitor of the high-frequency converter, so that an upper resonant circuit and a lower resonant circuit are formed; the upper and lower bridge arms of the modular multilevel converter output reverse-phase high-frequency alternating current, and energy is transmitted to the low-voltage side through the resonant circuit in a high-frequency mode. Compared with the existing multi-port power electronic transformer with high-voltage alternating current, high-voltage direct current and low-voltage direct current buses, the high-frequency electronic transformer topology can greatly reduce the number of high-frequency transformers, sub-modules, capacitors and switching devices, and does not need a high-frequency wave trap of the direct current buses, so that the size and the cost of the device are greatly reduced, and the efficiency and the power density of the device are improved.
Description
Technical Field
The invention belongs to the technical field of power electronics, and particularly relates to a high-power-density multi-port power electronic transformer topology.
Background
The power electronic transformer is a power electronic device with the functions of voltage conversion, reactive compensation, unbalance control, power quality control and the like. The multi-port power electronic transformer with high-voltage alternating current, high-voltage direct current and low-voltage direct current is suitable for an alternating-current and direct-current hybrid power grid, facilitates access and consumption of renewable energy sources, and also contributes to improvement of the operating efficiency and reliability of the power grid. The multi-port power electronic transformer has the function of an electric energy router in an energy internet.
Power electronic transformers are of a wide variety of configurations, with AC/DC type configurations facilitating the formation of high voltage AC, high voltage DC and low voltage DC busses, and thus are commonly used in multiport power electronic transformers. In medium and high voltage occasions, due to the fact that the voltage resistance of a power switch device is insufficient, a power electronic transformer needs to adopt a modular structure, and on one hand, due to the fact that the number of conversion stages of an AC/DC/DC type power electronic transformer is large, a plurality of sub-modules are caused; on the other hand, in the DC/DC high frequency conversion isolation link of the existing AC/DC power electronic transformer, the high voltage side sub-module is connected to the high voltage DC bus, and needs to withstand a higher DC voltage, resulting in numerous sub-modules, or connected to the DC side of the AC/DC link sub-module, the two sub-modules correspond to each other one by one, and the number of sub-modules is also numerous. The number of the submodules is numerous, the size, the cost and the control complexity of the device are increased greatly, the efficiency and the power density of the device are reduced, and the popularization and the application of the power electronic transformer are not facilitated.
Therefore, the conversion stage number of the multi-port power electronic transformer is reduced, the withstand voltage of a high-frequency conversion isolation link is reduced, the number of sub-modules is reduced, the cost of the device is reduced, the efficiency and the power density of the device are improved, and the method has important significance for promoting the popularization and application of the multi-port power electronic transformer.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a high-power-density multi-port power electronic transformer topology, which reduces the conversion stage number of the multi-port power electronic transformer and the withstand voltage of a high-frequency conversion isolation link, thereby reducing the number of sub-modules, power switching devices and high-frequency transformers, reducing the device cost and improving the efficiency and the power density of the device.
The specific technical scheme of the invention is as follows:
a high-power-density multi-port power electronic transformer topology comprises a high-voltage side modular multilevel converter, a middle side high-frequency converter and a low-voltage direct-current bus, wherein the high-voltage side modular multilevel converter comprises a high-voltage alternating-current power supply, a filter inductor, upper and lower bridge arm inductors, upper and lower cascade submodules, the high-voltage alternating-current power supply is respectively connected with the upper and lower bridge arm inductors after passing through the filter inductor, the upper and lower bridge arm inductors are connected to the input ends of the upper and lower cascade submodules, and the output ends of the upper and lower cascade submodules are connected in parallel to form a high-voltage direct-current positive bus and; the method is characterized in that: the middle side high-frequency converter comprises two blocking resonance capacitors, an alternating current resonance capacitor, a neutral point resonance capacitor, two high-frequency transformers and two low-voltage full bridges, one ends of the two blocking resonance capacitors are respectively connected with a positive bus and a negative bus of a high-voltage direct current bus, the other ends of the two blocking resonance capacitors are respectively connected with one ends of primary windings of the high-frequency transformers on the upper side and the lower side, the other ends of the primary windings of the high-frequency transformers on the upper side and the lower side are connected with each other to form a middle point, one end of the alternating current resonance capacitor is connected with a filter inductor, the other end of the alternating current resonance capacitor is connected with the neutral point resonance capacitor, the other end of the neutral point resonance capacitor; the low-voltage direct-current bus is formed by the output end of a low-voltage full bridge, and a low-voltage direct-current filter capacitor is connected to the low-voltage direct-current bus in parallel.
Further, each bridge arm of the high-voltage side modular multilevel converter comprises Nh cascaded half-bridge submodules and Nf cascaded full-bridge submodules.
Further, the upper bridge arm and the lower bridge arm of the high-voltage side modular multilevel converter output high-frequency sinusoidal or square wave signals with opposite phases and the same amplitude.
Furthermore, a full-bridge submodule and a half-bridge submodule of the high-voltage side-modularized multi-level converter output a power-frequency sinusoidal signal and a high-frequency sinusoidal or square wave signal simultaneously or alternately, and in addition, the half-bridge submodule also outputs a direct current signal simultaneously.
Further, the high-frequency transformer is a double-winding transformer, and the leakage inductance part of the high-frequency transformer replaces the inductance required by high-frequency resonance.
Further, when the middle side high frequency converter adopts open loop control, a bridge arm inductor, a blocking resonant capacitor, a high frequency transformer leakage inductor, a neutral point resonant capacitor and an alternating current resonant capacitor form a series resonant circuit; when the middle-side high-frequency converter adopts closed-loop control, the bridge arm inductor, the blocking resonant capacitor, the neutral point resonant capacitor and the alternating-current resonant capacitor form a series resonant circuit.
Further, the low-voltage full bridge comprises four fully-controlled power switches or four uncontrollable power switches.
Further, the intermediate high frequency converter has a vertically symmetrical structure, and the upper side and the lower side each include one high frequency conversion unit or a plurality of high frequency conversion units connected in parallel.
Further, each of the high frequency conversion units is composed of a high frequency transformer or a plurality of high frequency transformers connected in parallel and a low voltage full bridge or a plurality of low voltage full bridges connected in parallel.
Furthermore, the output ends of the low-voltage full bridges are not connected with each other to form independent low-voltage direct-current buses, or the output ends of the low-voltage full bridges are connected with each other in parallel or in series to form one or more low-voltage direct-current buses.
Advantageous effects
The invention provides a high-power-density multi-port power electronic transformer topology, which is provided with a high-voltage alternating current bus, a high-voltage direct current bus and a low-voltage direct current bus, an inverter can be arranged on the low-voltage direct current bus to realize low-voltage alternating current output, direct current voltage of the high-voltage direct current bus can be separated from alternating current input voltage of a high-frequency converter through a blocking resonance capacitor, and a high-frequency conversion unit is prevented from bearing high direct current voltage, so that the withstand voltage requirement on the high-frequency converter is reduced, and the number of the high-frequency conversion units is reduced; if the number of the low-voltage direct current ports needs to be increased, the high-frequency conversion units can be connected in parallel without being connected in series, so that the voltage of a high-voltage direct current bus is not influenced, the problem of series voltage sharing does not exist, and the problem of circulation current does not exist among the high-frequency conversion units connected in parallel due to the fact that the low-voltage direct current ports are isolated from each other, so that the advantages are favorable for plug and play of renewable energy sources; the neutral point is formed by the AC resonance capacitor, the neutral point is connected with the neutral point resonance capacitor, the structure can prevent positive-sequence power frequency AC signals from flowing into a resonance loop, the capacitance value of the AC resonance capacitor can be configured to be large by the series-connected neutral point resonance capacitor, so that the influence of the difference of the capacitance values of the AC resonance capacitors on resonance frequency and harmonic waves brought by high-voltage side power frequency AC output are reduced, a middle point is led out by the neutral point resonance capacitor and is connected with the upper high-frequency converter and the lower high-frequency converter, an upper high-frequency resonance passage and a lower high-frequency resonance passage are formed, the two resonance passages can independently operate and are mutually thermally redundant, the reliability of the device is improved, meanwhile, the middle point can be directly grounded or grounded through a resistor and a reactor, the withstand voltage of the high-frequency transformer during steady-state operation can be reduced, and; the upper bridge arm and the lower bridge arm of the high-voltage side modular multilevel energy converter respectively output high-frequency alternating current signals with opposite phases and the same amplitude, the high-frequency alternating current signals are mutually offset on a high-voltage direct current bus, and a high-frequency wave trap is not required to be arranged on the high-voltage direct current bus; the topology has a direct current link, can realize the complete structure of active power and reactive power, and has a certain isolation effect on the quality problem of electric energy among all ports; the topology adopts semi-full mixing, the full-bridge module does not output direct current signals, so that the direct current voltage utilization rate is high, and the direct current bipolar short circuit fault can be blocked by adopting a semi-full mixing structure.
The main advantages of the invention are that the number of sub-modules, the number of power switches and the number of high-frequency transformers of the multi-port power electronic transformer can be effectively reduced, the cost of the multi-port power electronic transformer is reduced, and the efficiency and the power density of the multi-port power electronic transformer are improved.
Drawings
FIG. 1 is a high power density multi-port power electronic transformer topology of the present invention;
FIG. 2 is a block diagram of a full bridge submodule in a high power density multi-port power electronic transformer topology according to the present invention;
FIG. 3 is a diagram of half-bridge sub-modules in a high power density multi-port power electronic transformer topology according to the present invention;
fig. 4 is a topological diagram of a power electronic transformer based on a modular multilevel converter in the prior art.
Wherein: filter inductance LfBridge arm inductance Larm,Leakage inductance Ld1And Ld2DC blocking resonant capacitor CdcrAC resonant capacitorCacrNeutral point resonant capacitor CNrLow voltage DC filter capacitor CdcLHigh frequency transformer Tr1、Tr2Power switching device T1、T2、T3、T4Full bridge submodule FBSM, half bridge submodule HBSM, half bridge submodule DC capacitor ChbsmFull bridge submodule DC capacitor Cfbsm。
Detailed Description
The invention provides a high-power-density multi-port power electronic transformer topology. As shown in fig. 1, the high-voltage side modular multilevel converter comprises a high-voltage side modular multilevel converter, a middle side high-frequency converter and a low-voltage direct-current bus; the high-voltage side modular multilevel converter is used for converting power frequency alternating current electric energy into direct current electric energy and high-frequency alternating current electric energy; the middle side high-frequency converter is used for electrically isolating and converting high-frequency alternating current electric energy into direct current electric energy; the low-voltage direct-current bus is used for supplying power to a low-voltage direct-current load or arranging an inverter to supply power to a low-voltage alternating-current load; the high-voltage side modular multilevel converter comprises a high-voltage alternating-current power supply, a filter inductor, bridge arm inductors and a cascade submodule, wherein the high-voltage alternating-current power supply is respectively connected with the upper bridge arm inductor and the lower bridge arm inductor after passing through the filter inductor; the middle side high-frequency converter comprises blocking resonance capacitors, alternating current resonance capacitors, neutral point resonance capacitors, a high-frequency transformer and a low-voltage full bridge, one ends of the two blocking resonance capacitors are respectively connected with a positive bus and a negative bus of a high-voltage direct current bus, the other ends of the two blocking resonance capacitors are respectively connected with one ends of primary windings of the high-frequency transformer on the upper side and the lower side, the other ends of the primary windings of the high-frequency transformer on the upper side and the lower side are connected with each other to form a middle point, one end of each alternating current resonance capacitor is connected with a filter inductor, the other end of each alternating current resonance capacitor is connected with the corresponding neutral point resonance capacitor, the other end of each neutral point resonance capacitor is connected; the low-voltage direct current bus is formed by the output end of a low-voltage full bridge, and a low-voltage direct current filter capacitor is connected to the low-voltage direct current bus in parallel.
Each phase of an upper bridge arm and a lower bridge arm of the high-voltage side modular multilevel structure respectively comprises Nh cascaded half-bridge submodules and Nf cascaded full-bridge submodules, wherein the voltage Uhbsm of the half-bridge submodules multiplied by the number Nh of the half-bridge submodules is required to be more than or equal to the voltage of a high-voltage direct-current bus; the full-bridge sub-module voltage Ufbsm multiplied by the number Nh of the half-bridge sub-modules needs to be larger than or equal to a high-frequency alternating-current voltage peak value input into the high-frequency converter.
The high-frequency sine or high-frequency square wave signals of the upper bridge arm and the lower bridge arm of the high-voltage side modular multilevel converter are mutually offset on the high-voltage direct-current bus, and the high-frequency sine or high-frequency square wave signals do not contain on the direct-current bus.
The full-bridge submodule and the half-bridge submodule of the high-voltage side modular multilevel converter simultaneously or alternately output power frequency sinusoidal signals and high-frequency alternating-current signals, the power frequency alternating-current signals are directly converted into high-frequency alternating-current signals input by the middle side high-frequency converter, and conversion links are reduced; the half-bridge sub-modules also output direct current signals simultaneously.
The high-frequency transformer is a double-winding transformer, the leakage inductance part of the high-frequency transformer replaces inductance required by high-frequency resonance, and two ends of a primary winding of the high-frequency transformer can be connected with a bypass switch in parallel, so that direct-current magnetic bias of the high-frequency transformer caused by charging of a blocking resonance capacitor in the starting process is prevented.
When the high-frequency converter adopts open-loop control, a bridge arm inductor, a blocking resonant capacitor, a leakage inductor of the high-frequency transformer, a neutral point resonant capacitor and an alternating-current resonant capacitor form a series resonant circuit, and the primary and secondary voltages of the high-frequency transformer are distributed according to a transformation ratio; when the high-frequency converter adopts closed-loop control, the bridge arm inductor, the blocking resonant capacitor, the neutral point resonant capacitor and the alternating-current resonant capacitor form a series resonant circuit, and the leakage inductance of the high-frequency transformer can be utilized to control the transmission power of the high-frequency converter by adopting closed-loop phase-shifting control.
The full-bridge submodule comprises four full-control power switching devices and a direct-current capacitor, the half-bridge submodule comprises two full-control power switching devices and a direct-current capacitor, and the output ends of the half-bridge submodule and the full-bridge submodule can be connected with a bypass switch in parallel to cut off a fault submodule; the low-voltage full bridge can adopt four full-control power switching devices to realize bidirectional power flow, and can also adopt four uncontrollable power switching devices, and at the moment, the power can only flow from a high-voltage side to a low-voltage side.
The high-frequency converter is in an up-down symmetrical structure, the upper side and the lower side can respectively comprise a high-frequency conversion unit, and in a large-capacity occasion, the upper side and the lower side can adopt a plurality of high-frequency conversion units to be connected in parallel, so that the capacity of a single high-frequency conversion unit is reduced; a high-frequency conversion unit consists of one or more high-frequency transformers connected in parallel and one or more low-voltage full bridges.
If the output ends of the low-voltage full bridges are not connected with each other, an independent low-voltage direct-current bus can be formed; and if the output ends of the low-voltage full bridges are connected in parallel or in series, one or more low-voltage direct-current buses are formed.
The following description will be made with reference to an embodiment.
The embodiment analysis is carried out by taking three-phase high-voltage alternating current of 10kV/1MVA/50Hz, high-voltage direct current of 20kV/0.5MVA and low-voltage direct current of 750V/0.5MVA as examples.
The method has the advantages that the economy and the efficiency are integrated, the voltage of the high-voltage side modular multilevel converter submodule is 900V, so that the number Nh of the bridge arm half-bridge submodule is greater than or equal to (20000/900) and approximately equal to 22.2, and the number Nh is 23; in order to reduce the number of sub-modules as much as possible, setting Nf to be 1, wherein the peak value of alternating voltage input by the high-frequency converter is 900V, the waveform is designed to be square wave, and the frequency is designed to be 10 kHz; the primary voltage of the high-frequency transformer is 900V, the secondary voltage is 750V, and the transformation ratio is 1.2: 1.
According to the above-identified conditions, the effective value of the input current at the upper side or the lower side of the high-frequency transformer is about 278A, which is equal to the effective value of the primary current of the high-frequency transformer, and the peak value is about 393A, while the effective value of the secondary current of the high-frequency transformer is 278 × 1.2 which is 334A, which is 472A, and the low-voltage dc bus voltage is 750V. In summary, the low voltage full bridge can be formed by two 1200V/450A IGBT half bridge modules, such as British Flow 450R12ME4, with a total usage of 4.
According to the determined conditions, the peak value of the obtained high-voltage alternating current is about 82A, the current of the high-voltage direct current bus is about 25A, so that the effective value of the bridge arm current of the obtained modular multilevel converter is about 116A, the peak value is about 207A, the voltage of the submodule is 900V, and in sum, the half-bridge submodule or the full-bridge submodule power switching device can adopt 1700V/300A IGBT half-bridge modules, such as the english flying FF300R17ME4, and the total dosage is Nf × 2 × 6+ Nh × 6, which is 150.
In summary, the proposed topology requires 154 IGBT half-bridge modules, 2 high-frequency transformers, and 148 sub-modules (in one half-bridge or full-bridge). If a direct current bipolar fault blocking function is needed, the total voltage of the full-bridge sub-modules in the upper bridge arm and the lower bridge arm is more than or equal to twice of the voltage peak value of the high-voltage alternating current power line, at this time, the full-bridge sub-modules can be additionally arranged in the bridge arms, or part of the half-bridge sub-modules are changed into the full-bridge sub-modules, but the working mode of the half-bridge sub-modules is still the.
Topology comparison:
fig. 4 shows a prior art power electronic transformer topology based on a modular multilevel converter. In the above case, if the high-voltage side modular multilevel converter in the topology of fig. 4 also employs 900V submodules, 138 IGBT half-bridge modules are required for the high-voltage side modular multilevel converter in the topology of fig. 4, and if the isolation stage also employs 900V submodules, 92 IGBT half-bridge modules are required for the isolation stage in the topology of fig. 4, which, in total, requires 230 IGBT half-bridge modules, 23 high-frequency transformers, and 184 submodules (in terms of one half-bridge or full-bridge). Compared with the topology provided by the invention, the usage amount of the IGBT half-bridge module in the topology shown in FIG. 4 is increased by 49.3%, the usage amount of the high-frequency transformer is increased by 1050%, and the number of the sub-modules is increased by 24.3%.
In addition, if more low-voltage direct-current ports capable of working independently need to be added to the topology in fig. 4, an isolation stage needs to be added to the high-voltage direct-current bus, that is, each additional low-voltage direct-current port needs to be added with 23 high-frequency transformers and full-bridge modules on the primary side and the secondary side of the transformers, and the topology provided by the patent only needs to be connected with one high-frequency conversion unit in parallel on the upper side and the lower side of the high-frequency converter, so that better expandability is achieved.
In conclusion, the topology can effectively reduce the number of power switches, the number of high-frequency transformers and the number of submodules, reduce the cost of the power electronic transformer, improve the efficiency and the power density of the power electronic transformer, simultaneously has good expandability, is convenient to form a plurality of low-voltage direct-current ports which are isolated from each other, is beneficial to the plug and play of renewable energy sources, and has a direct-current link, can realize the complete decoupling of active power and reactive power and the isolation of the problem of the quality of electric energy, and has good controllability and output characteristics.
Claims (10)
1. A high-power-density multi-port power electronic transformer topology comprises a high-voltage side modular multilevel converter, a middle side high-frequency converter and a low-voltage direct-current bus, wherein the high-voltage side modular multilevel converter comprises a high-voltage alternating-current power supply, a filter inductor, upper and lower bridge arm inductors, upper and lower cascade submodules, the high-voltage alternating-current power supply is respectively connected with the upper and lower bridge arm inductors after passing through the filter inductor, the upper and lower bridge arm inductors are connected to the input ends of the upper and lower cascade submodules, and the output ends of the upper and lower cascade submodules are connected in parallel to form a high-voltage direct-current positive bus and; the method is characterized in that: the middle side high-frequency converter comprises two blocking resonance capacitors, an alternating current resonance capacitor, a neutral point resonance capacitor, two high-frequency transformers and two low-voltage full bridges, one ends of the two blocking resonance capacitors are respectively connected with a positive bus and a negative bus of a high-voltage direct current bus, the other ends of the two blocking resonance capacitors are respectively connected with one ends of primary windings of the high-frequency transformers on the upper side and the lower side, the other ends of the primary windings of the high-frequency transformers on the upper side and the lower side are connected with each other to form a middle point, one end of the alternating current resonance capacitor is connected with a filter inductor, the other end of the alternating current resonance capacitor is connected with the neutral point resonance capacitor, the other end of the neutral point resonance capacitor; the low-voltage direct-current bus is formed by the output end of a low-voltage full bridge, and a low-voltage direct-current filter capacitor is connected to the low-voltage direct-current bus in parallel.
2. A high power density, multiport power electronic transformer topology according to claim 1, characterized in that: each bridge arm of the high-voltage side-modularized multi-level converter comprises Nh half-bridge submodules and Nf full-bridge submodules which are cascaded.
3. A high power density, multiport power electronic transformer topology according to claim 1, characterized in that: the upper bridge arm and the lower bridge arm of the high-voltage side modular multilevel converter output high-frequency sinusoidal or square wave signals with opposite phases and the same amplitude.
4. A high power density, multiport power electronic transformer topology according to claim 2, characterized in that: the full-bridge submodule and the half-bridge submodule of the high-voltage side-modularized multi-level converter output a power-frequency sinusoidal signal and a high-frequency sinusoidal or square wave signal simultaneously or alternately, and in addition, the half-bridge submodule also outputs a direct current signal simultaneously.
5. A high power density, multiport power electronic transformer topology according to claim 1, characterized in that: the high-frequency transformer is a double-winding transformer, and the leakage inductance part of the high-frequency transformer replaces the inductance required by high-frequency resonance.
6. A high power density, multiport power electronic transformer topology according to claim 1, characterized in that: when the middle side high-frequency converter adopts open-loop control, a bridge arm inductor, a blocking resonant capacitor, a high-frequency transformer leakage inductor, a neutral point resonant capacitor and an alternating-current resonant capacitor form a series resonant circuit; when the middle-side high-frequency converter adopts closed-loop control, the bridge arm inductor, the blocking resonant capacitor, the neutral point resonant capacitor and the alternating-current resonant capacitor form a series resonant circuit.
7. A high power density, multiport power electronic transformer topology according to claim 1, characterized in that: the low-voltage full bridge comprises four fully-controlled power switching devices or four uncontrollable power switching devices.
8. The high power density, multiport power electronic transformer topology of claim 1, characterized in that: the middle high-frequency converter is in a vertically symmetrical structure, and the upper side and the lower side of the middle high-frequency converter respectively comprise one high-frequency conversion unit or a plurality of high-frequency conversion units connected in parallel.
9. The high power density, multiport power electronic transformer topology of claim 8, characterized in that: each high-frequency conversion unit consists of a high-frequency transformer or a plurality of high-frequency transformers connected in parallel and a low-voltage full bridge or a plurality of low-voltage full bridges connected in parallel.
10. A high power density, multiport power electronic transformer topology according to claim 1, characterized in that: the output ends of the low-voltage full bridges are not connected with each other to form independent low-voltage direct-current buses, or the output ends of the low-voltage full bridges are connected in parallel or in series to form one or more low-voltage direct-current buses.
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