CN109560707B - Modular three-port direct current converter - Google Patents
Modular three-port direct current converter Download PDFInfo
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- CN109560707B CN109560707B CN201811148028.4A CN201811148028A CN109560707B CN 109560707 B CN109560707 B CN 109560707B CN 201811148028 A CN201811148028 A CN 201811148028A CN 109560707 B CN109560707 B CN 109560707B
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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
- H02M3/3353—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 at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter
Abstract
The invention aims to overcome the defects of the prior art and provides a modular three-port direct current converter, wherein a topological structure can be connected with a medium-voltage direct current bus, a low-voltage direct current bus and an energy storage element. The invention provides a modular three-port direct current converter which is characterized by comprising a modular multilevel converter, a double-active-bridge converting circuit and a multiple bridge chopper circuit; the input end of the modular multilevel converter is electrically connected with the medium-voltage direct-current bus; the output end of the modular multilevel converter is respectively and electrically connected with the input ends of the double-active-bridge converting circuit and the multiple bridge type chopper circuit; the output end of the double-active-bridge conversion circuit is electrically connected with the input end of the low-voltage direct-current bus; the output end of the multiple bridge type chopper circuit is electrically connected with the input end of the energy storage element; the output end of the energy storage element is electrically connected with the input end of the low-voltage direct-current bus.
Description
Technical Field
The invention relates to the technical field of power electronic electric energy conversion, in particular to a modular three-port direct current converter.
Background
Integrated Power Systems (IPS) are the hallmark of all-electric ships. The power and electric power system which are mutually independent in the traditional ship are combined into one in the form of electric energy, comprehensive utilization of the whole ship energy is realized, the development trend of the ship power is realized, and the power is known as the third revolution of the ship power from manpower, wind power to steam power and from the steam power to nuclear power. The integrated power system is a revolutionary technology for exerting the power of ships. The mechanical propulsion system of a traditional ship consists of a heat engine and other mechanical equipment, and an electric power system is used as an independent auxiliary power system, and the heat engine and the auxiliary power system are not directly related. The comprehensive power system integrates power generation and supply, daily power consumption, propulsion power consumption, high-energy weapon power consumption and power supply of other equipment into a unified power system, and has the advantages of lower operation noise, stronger survivability, fewer prime movers, lower oil consumption and more convenient equipment self-assembly.
The integrated power system can be divided into two types of medium-voltage alternating current and medium-voltage direct current according to the difference of the power transmission network power system. At present, a medium-voltage alternating-current integrated power system is generally applied to ships at home and abroad. Compared with a medium-voltage alternating-current integrated power system, the medium-voltage direct-current integrated power system has the advantages of high power density, good adaptability, no limitation of the system frequency on the rotation speed of a prime mover, good power grid reconstruction capability, high efficiency and the like. Therefore, the medium-voltage dc integrated power system has been determined as a development direction of the future marine integrated power system.
The ship comprehensive power system comprises a power generation module, a power transmission and distribution module, a power conversion module, an electric propulsion module, an energy storage module and the like. The power conversion module consists of a converter and related equipment, and is used for converting electric energy of a power distribution network into a form which can be utilized by a load, and the power conversion module plays a role of an energy router in the whole system. With the increase of high-efficiency electromagnetic weapons and the expansion of the capacity of the ship comprehensive power system, the voltage level of the ship comprehensive power system is gradually improved, and the highest voltage level of the medium-voltage side of the second-generation comprehensive power system in the current demonstration reaches 10 kV. With the increase of the medium-voltage side voltage class, higher requirements are put on the direct-current converter for connecting the medium-voltage direct-current bus and the low-voltage direct-current bus. The conventional direct current converter topological structure is difficult to meet the requirement of a 10kV medium-voltage bus due to the limitation of the voltage stress of the existing switching tube.
With the application of various high-efficiency electromagnetic weapons on the ship, the current integrated power system is difficult to meet the energy requirement of the electromagnetic weapons in a short time. Electromagnetic emission weapons have short operating times, high power requirements, and impact the stability of medium voltage direct current networks. And the high-capacity energy storage link can effectively link the influence of electromagnetic weapon emission on the power grid system. Therefore, an energy storage link is arranged in a future ship integrated power system, the stability of the power system is improved, and the medium-voltage direct-current conversion device of the direct-current regional power transformation and distribution system is required to have the bidirectional electric energy conversion capability and can be flexibly matched with the energy storage link configured by the system besides the power transformation function.
In conclusion, a medium-voltage direct-current integrated power system is the development direction of future ship power; the high-capacity energy storage link is the necessary requirement for high-efficiency electromagnetic weapons to get on the ship; the three-port direct-current converter is core equipment for connecting a medium-voltage side, a low-voltage load side and an energy storage link in a medium-voltage direct-current integrated power system, but the three-port direct-current converter which meets the requirements in the prior art does not exist.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a modular three-port direct current converter, wherein a topological structure can be connected with a medium-voltage direct current bus, a low-voltage direct current bus and an energy storage element.
The invention provides a modular three-port direct current converter which is characterized by comprising a modular multilevel converter, a double-active-bridge converting circuit and a multiple bridge chopper circuit; the input end of the modular multilevel converter is electrically connected with the medium-voltage direct-current bus; the output end of the modular multilevel converter is respectively and electrically connected with the input ends of the double-active-bridge converting circuit and the multiple bridge type chopper circuit; the output end of the double-active-bridge conversion circuit is electrically connected with the input end of the low-voltage direct-current bus; the output end of the multiple bridge type chopper circuit is electrically connected with the input end of the energy storage element; the output end of the energy storage element is electrically connected with the input end of the low-voltage direct-current bus.
In the technical scheme, when the power of the medium-voltage direct-current bus is sufficient and the energy storage element does not need to be charged, the medium-voltage direct-current bus supplies power to the low-voltage direct-current bus, and the energy storage element is cut off; the output voltage of the modular multilevel converter is controlled to be constant, and the output voltage of the dual-active-bridge conversion circuit is controlled to be constant.
In the technical scheme, when the power of the medium-voltage direct-current bus is sufficient and the energy storage element needs to be charged, the medium-voltage direct-current bus supplies power to the energy storage element and the low-voltage direct-current bus simultaneously, and the multi-level converter controls the output voltage of the multi-level converter; the double-active-bridge conversion circuit controls the output voltage thereof; the multiple bridge chopper circuit controls the output current.
In the technical scheme, when the power of the medium-voltage direct-current bus is insufficient and the medium-voltage direct-current bus does not need to absorb the power, the energy storage element supplies power to the low-voltage direct-current bus, and the medium-voltage direct-current bus is cut off; the multiple bridge type chopper circuit controls the voltage of the output end of the modular multilevel converter; the double-active-bridge conversion circuit controls the output voltage.
In the technical scheme, when the power of the medium-voltage direct-current bus is insufficient and the medium-voltage direct-current bus needs to absorb power, the energy storage element supplies power to the medium-voltage direct-current bus and the low-voltage direct-current bus, and the voltage of the output end of the modular multilevel converter is controlled by the multiple bridge chopper circuit; the modular multilevel converter controls the input current of the input end thereof; the double-active-bridge conversion circuit controls the output voltage.
In the technical scheme, when the power of the medium-voltage direct-current bus is insufficient and the medium-voltage direct-current bus does not need to absorb the power, the medium-voltage direct-current bus is reserved, the medium-voltage direct-current bus and the energy storage element simultaneously supply power to the low-voltage direct-current bus, and the multi-level converter controls the output voltage of the multi-level converter; the double-active-bridge conversion circuit controls the output voltage thereof; multiple bridge type chopper circuit for controlling output current thereof
In the technical scheme, a branch circuit is formed by a modular multilevel converter, a double-active-bridge conversion circuit and a multiple bridge chopper circuit; a plurality of branches are connected in parallel; the input end of the modular multilevel converter of each branch circuit is electrically connected in parallel with the medium-voltage direct-current bus; the output end of the double-active-bridge conversion circuit of each branch circuit is connected in parallel with the low-voltage direct-current bus; and the output end of the multiple bridge type chopper circuit of each branch is independently provided with an energy storage element.
In the technical scheme, the modular multilevel converter, the double-active-bridge conversion circuit and the multiple-bridge chopper circuit have energy bidirectional conversion capability.
In the above technical solution, the modular multilevel converter adopts a half-bridge type, a full-bridge type, a diode clamped type, a hybrid bridge type or a double half-bridge clamped type.
In the above technical solution, the dual active bridge converter circuit includes a high frequency isolation transformer.
By adopting the technical scheme, the invention has the following beneficial effects:
(1) the modular multilevel topological structure is adopted to match the medium-voltage direct-current bus, and the voltage grade of the medium-voltage direct-current bus can be adapted by adjusting the number of the sub-modules. The voltage of the medium-voltage direct-current bus is shared by the sub-modules, and the post-stage converter is cascaded at the post stage of the sub-modules of the modular multilevel circuit, so that the problem of great difference between the voltages of the medium-voltage direct-current bus and the low-voltage direct-current bus at the daily load side is well solved, and the use of a high-transformation-ratio isolation transformer in the converter is avoided.
(2) The high-frequency isolation frequency converter is arranged in the double-active-bridge converter, so that the daily load low-voltage direct-current bus can be electrically isolated from the medium-voltage direct-current bus, and the electricity safety of the low-voltage side is improved. The ports of the double-active-bridge circuits are connected in parallel at the daily load side, so that the characteristics of low voltage and large current of the daily load low-voltage direct-current bus are well adapted, the current of the low-voltage direct-current bus is uniformly distributed on the output port of each double-active-bridge circuit, and the current stress of the switch tube is reduced.
(3) One end of the multiple bridge type chopper circuit is cascaded on the sub-modules of the modular multilevel circuit, the other end of the multiple bridge type chopper circuit is connected with the energy storage element, and the charging and discharging of the medium-voltage direct-current bus to the energy storage element are converted into the charging and discharging of each sub-module to the energy storage element. The energy storage elements are respectively and independently arranged, so that distributed energy storage is realized, the total capacity of the energy storage elements is ensured, and the modularization degree of the energy storage elements is also ensured.
(4) A highly integrated three-port direct current converter is connected with a medium-voltage direct current bus, a low-voltage direct current bus and an energy storage element, the task which can be completed by two or three converters originally is completed, and the integration level of the system is greatly improved. The modularity of the converter is very high and each branch can be operated independently. If partial branch circuit has faults, the system still has the operation capability, and the reliability and the power supply continuity of the system are guaranteed. Meanwhile, the highly modularized design mode greatly shortens the design period, reduces the design cost and shows stronger flexibility.
(5) The four working modes of the modularized three-port direct-current converter cover all the operating conditions of the medium-voltage direct-current power distribution system. The working mode of the modular three-port direct current converter can be automatically switched according to the energy flow requirement of the system, and the modular three-port direct current converter has strong self-adaptive control capability. Although the converter is internally provided with a plurality of branches and submodules, the whole converter adopts an integrated control structure, coordination and coordination among all ports and flexible energy scheduling can be realized, and the stability of a medium-voltage direct-current power distribution system is integrally improved.
Drawings
FIG. 1 is a block diagram of a modular three-port DC converter topology
FIG. 2 decision diagram for converter operating mode selection
FIG. 3 is a modular multilevel topology for matching medium voltage DC buses
FIG. 4 is a dual active bridge topology structure for matching low voltage DC bus
Fig. 5 matches a dual bridge chopping topology of the energy storage element.
Detailed Description
The invention will be further described in detail with reference to the following drawings and specific examples, which are not intended to limit the invention, but are for clear understanding.
As shown in fig. 1, the present invention provides a modular three-port dc converter, which is characterized in that the converter comprises a modular multilevel converter, a dual-active bridge converting circuit and a multiple bridge chopper circuit; the input end of the modular multilevel converter is electrically connected with the medium-voltage direct-current bus; the output end of the modular multilevel converter is respectively and electrically connected with the input ends of the double-active-bridge converting circuit and the multiple bridge type chopper circuit; the output end of the double-active-bridge conversion circuit is electrically connected with the input end of the low-voltage direct-current bus; the output end of the multiple bridge type chopper circuit is electrically connected with the input end of the energy storage element; the output end of the energy storage element is electrically connected with the input end of the low-voltage direct-current bus. The modular multilevel converter, the double-active-bridge converting circuit and the multiple bridge type chopper circuit have energy bidirectional conversion capability.
In the technical scheme, a branch circuit is formed by a modular multilevel converter, a double-active-bridge conversion circuit and a multiple bridge chopper circuit; a plurality of branches are connected in parallel; the input end of the modular multilevel converter of each branch circuit is electrically connected in parallel with the medium-voltage direct-current bus; the output end of the double-active-bridge conversion circuit of each branch circuit is connected in parallel with the low-voltage direct-current bus; and the output end of the multiple bridge type chopper circuit of each branch is independently provided with an energy storage element. The double-active-bridge topological structure is used for matching a low-voltage direct-current power grid, and a plurality of groups of double-active-bridge topological structures are connected in parallel at the side of the low-voltage direct-current power grid; the multiple bridge type chopping topological structure is used for being matched with the energy storage units, and the energy storage units of each branch circuit are independently arranged, so that distributed energy storage is realized.
The invention adopts a modular multilevel topological structure to match with a medium-voltage direct-current bus in a ship comprehensive power system. The submodules in the modular multilevel topology structure can be of a half-bridge type, a full-bridge type, a diode clamping type, a hybrid bridge type, a double half-bridge clamping type and the like. And other isolated or non-isolated direct current converters are cascaded to the energy storage capacitor port of each sub-module. In this embodiment, the voltage of the medium-voltage side dc bus of the modular three-port dc converter is 10kV, the modular multilevel dc converter matched with the medium-voltage side dc bus includes N half-bridge submodules, and the capacitor voltage of each submodule in the operation process is (20/N) kV. Aiming at the modular multilevel DC converter, a phase-shifting modulation mode is adopted, wherein the phase-shifting modulation means that each half-bridge submodule gives the same duty ratio, but the switching signal of each half-bridge submodule is sequentially phase-shifted by 2 pi/N (rad), wherein N is the branch number of an MTDC system. When phase shift modulation is used, the ripple frequency of the output voltage signal is a multiple of the frequency of the switching signal. If phase shift modulation is adopted, the switching frequency can be equivalently improved, so that current and voltage ripples are reduced. A modular multilevel topology matching the medium voltage dc bus is shown in fig. 3.
A double-active-bridge topological structure is adopted to match with a low-voltage direct-current bus, the double-active-bridge topological structure is connected to the energy storage capacitor ports of the sub-modules of the modular multilevel topological structure, and each sub-module is connected with one double-active-bridge topological structure at the upper stage. And the other port of the double-active-bridge topology unit is connected with a low-voltage direct-current bus, the double-active-bridge topology unit is provided with a high-frequency isolation transformer, and the double-active-bridge topology units are directly connected in parallel at the side of the low-voltage direct-current bus. In the embodiment, the topology structure of the double active bridges is as shown in fig. 4, an upper switch and a lower switch in the same H-bridge are complementarily turned on, and the duty ratio of each H-bridge switch is fixed to 0.5. The output voltage waveform of the primary H bridge of the transformer is consistent with the output voltage waveform of the secondary H bridge of the transformer, and the control of the transmission power and the direction of the converter is realized by controlling the phase shift angle of the output voltage waveforms of the two H bridges. The double-active-bridge converter absorbs energy from the half-bridge sub-module at the upper stage and transmits the energy to the low-voltage side direct-current bus for daily load.
The multiple bridge type chopper circuit is connected to the port of the energy storage capacitor of the submodule of the modular multilevel topological structure, and each submodule is connected with one multiple bridge type chopper circuit structure at an upper level. And the other port of the multiple bridge type chopping topological unit is respectively connected with a group of energy storage units, such as a storage battery, a super capacitor and the like. The multiple bridge type chopping topology unit is a non-isolated topology, has energy bidirectional flowing capability and capability of charging or discharging the energy storage unit, and the topological structure of the multiple bridge type chopping topology unit is shown in fig. 5. The multiplexing circuit adopts a phase-shift modulation mode, so that output currents of all bridge arms can be superposed to obtain smaller current ripples. When the energy storage element needs to be charged, the dual-bridge chopper circuit absorbs energy from the half-bridge sub-module at the upper stage and stores the energy into the energy storage element. When the energy storage element needs to be discharged, the dual bridge type chopper circuit absorbs energy from the energy storage element and stores the energy into the energy storage capacitor of the half-bridge sub-module.
In a normal working mode, the medium-voltage side direct-current bus supplies power to a daily load through the modular multilevel direct-current converter and the double-active-bridge converter. When the energy transferred to the daily charge of the modular multilevel converter is small, the multiple bridge type chopper circuit is started to charge the energy storage element. When the medium-voltage bus fails, the medium-voltage side is cut off, the voltage of each half-bridge submodule is controlled by a bridge type chopper circuit, and energy is provided for the double-active-bridge converter.
As shown in fig. 2, the present invention includes 4 modes of operation: firstly, supplying power to a daily load (namely a low-voltage direct-current bus) by a medium-voltage direct-current bus, and cutting off an energy storage element; a medium-voltage direct-current bus supplies power to the energy storage element and the daily load at the same time; or the medium-voltage direct-current bus and the energy storage element simultaneously supply power to the daily load; thirdly, the energy storage element supplies power to the daily load and cuts off the medium-voltage side; and fourthly, the energy storage element supplies power to the medium-voltage side and the daily load, and the medium-voltage side is considered to be an active load at the moment.
The following explains the corresponding working modes adopted in different working conditions one by one:
working mode 1: when the power of the medium-voltage direct-current bus is sufficient and the energy storage element does not need to be charged, the medium-voltage direct-current bus supplies power to the low-voltage direct-current bus, and the energy storage element is cut off; the output voltage of the modular multilevel converter is controlled to be constant, and the output voltage of the dual-active-bridge conversion circuit is controlled to be constant. The half-bridge submodule (or other type of submodule) now controls the voltage u of the capacitor C00Constant double active bridge circuit controlled daily load voltage udConstant
The working mode 2 is as follows: when the power of the medium-voltage direct-current bus is sufficient and the energy storage element needs to be charged, the medium-voltage direct-current bus supplies power to the energy storage element and the low-voltage direct-current bus at the same time, and the multi-level converter controls the output voltage of the multi-level converter; the double-active-bridge conversion circuit controls the output voltage thereof; the multiple bridge chopper circuit controls the output current. When the power of the medium-voltage direct-current bus is insufficient and the medium-voltage direct-current bus does not need to absorb the power, the medium-voltage direct-current bus is reserved, the medium-voltage direct-current bus and the energy storage element simultaneously supply power to the low-voltage direct-current bus, and the multi-level converter controls the output voltage of the multi-level converter; the double-active-bridge conversion circuit controls the output voltage thereof; the multiple bridge chopper circuit controls the output current. At this time, the half-bridge submodule controls the capacitor C0Voltage u0The double active bridge circuit controls the voltage of the daily load, and the multiple bridge chopper circuit controls the current i of the energy storage elementb
Working mode 3: when the power of the medium-voltage direct-current bus is insufficient and the medium-voltage direct-current bus does not need to absorb the power, the energy storage element supplies power to the low-voltage direct-current bus, and the medium-voltage direct-current bus is cut off; control modularization of multiple bridge type chopper circuitVoltage at the output of the multilevel converter; the double-active-bridge conversion circuit controls the output voltage. Multiple bridge type chopper circuit control capacitor C at the moment0Voltage u0The double-active-bridge circuit controls the daily load voltage.
The working mode 4 is as follows: when the power of the medium-voltage direct-current bus is insufficient and the medium-voltage direct-current bus needs to absorb power, the energy storage element supplies power to the medium-voltage direct-current bus and the low-voltage direct-current bus, and the voltage of the output end of the modular multilevel converter is controlled by the multiple bridge type chopper circuit; the modular multilevel converter controls the input current of the input end thereof; the double-active-bridge conversion circuit controls the output voltage. At this time, the voltage u of the capacitor C0 is controlled by the multiple bridge chopper circuit0Half-bridge submodule controlling medium-voltage side current iMVDCThe double-active-bridge circuit controls the daily load voltage.
Details not described in this specification are within the skill of the art that are well known to those skilled in the art.
Claims (4)
1. A modularized three-port direct current converter is characterized by comprising a modularized multi-level converter, a double-active-bridge conversion circuit and a multiple bridge chopper circuit; the input end of the modular multilevel converter is electrically connected with the medium-voltage direct-current bus; the output end of the modular multilevel converter is respectively and electrically connected with the input ends of the double-active-bridge converting circuit and the multiple bridge type chopper circuit; the output end of the double-active-bridge conversion circuit is electrically connected with the input end of the low-voltage direct-current bus; the output end of the multiple bridge type chopper circuit is electrically connected with the input end of the energy storage element; the output end of the energy storage element is electrically connected with the input end of the low-voltage direct current bus;
when the power of the medium-voltage direct-current bus is sufficient and the energy storage element does not need to be charged, the medium-voltage direct-current bus supplies power to the low-voltage direct-current bus, and the energy storage element is cut off; the output voltage of the modular multilevel converter is controlled to be constant, and the output voltage of the dual-active-bridge conversion circuit is controlled to be constant;
when the power of the medium-voltage direct-current bus is sufficient and the energy storage element needs to be charged, the medium-voltage direct-current bus supplies power to the energy storage element and the low-voltage direct-current bus at the same time, and the multi-level converter controls the output voltage of the multi-level converter; the double-active-bridge conversion circuit controls the output voltage thereof; the multiple bridge type chopper circuit controls the output current;
when the power of the medium-voltage direct-current bus is insufficient and the medium-voltage direct-current bus does not need to absorb the power, the energy storage element supplies power to the low-voltage direct-current bus, and the medium-voltage direct-current bus is cut off; the multiple bridge type chopper circuit controls the voltage of the output end of the modular multilevel converter; the double-active-bridge conversion circuit controls the output voltage thereof;
when the power of the medium-voltage direct-current bus is insufficient and the medium-voltage direct-current bus needs to absorb power, the energy storage element supplies power to the medium-voltage direct-current bus and the low-voltage direct-current bus, and the voltage of the output end of the modular multilevel converter is controlled by the multiple bridge type chopper circuit; the modular multilevel converter controls the input current of the input end thereof; the double-active-bridge conversion circuit controls the output voltage thereof;
when the power of the medium-voltage direct-current bus is insufficient and the medium-voltage direct-current bus does not need to absorb the power, the medium-voltage direct-current bus is reserved, the medium-voltage direct-current bus and the energy storage element simultaneously supply power to the low-voltage direct-current bus, and the multi-level converter controls the output voltage of the multi-level converter; the double-active-bridge conversion circuit controls the output voltage thereof; the multiple bridge type chopper circuit controls the output current;
a modular multilevel converter, a double-active-bridge conversion circuit and a multiple-bridge chopper circuit form a branch circuit; a plurality of branches are connected in parallel; the input end of the multilevel converter is electrically connected in parallel with the medium-voltage direct-current bus and matched with the medium-voltage direct-current bus in the ship comprehensive power system; the output end of the double-active-bridge conversion circuit of each branch circuit is connected in parallel with the low-voltage direct-current bus; the output end of the multiple bridge type chopper circuit of each branch circuit is independently provided with an energy storage element;
the double-active-bridge converting circuit is matched with a low-voltage direct-current bus, the double-active-bridge converting circuit is connected to a submodule energy storage capacitor port of the modular multilevel converter, and each submodule is connected with one double-active-bridge converting circuit at the upper stage; the other port of the double-active-bridge conversion circuit is connected with a low-voltage direct-current bus, the double-active-bridge conversion circuit is provided with a high-frequency isolation transformer, and a plurality of double-active-bridge topology conversion circuits are directly connected in parallel at the side of the low-voltage direct-current bus; the double-active-bridge converter absorbs energy from the upper-stage half-bridge sub-module and transmits the energy to the low-voltage side direct-current bus for daily load;
the multiple bridge type chopper circuit is connected to the energy storage capacitor port of the sub-modules of the modular multilevel converter, and each sub-module is connected with a multiple bridge type chopper circuit structure at the upper stage; the other port of the multiple bridge type chopper circuit is respectively connected with a group of energy storage units; the multiple bridge type chopper circuit is in a non-isolated topology, has energy bidirectional flowing capacity and has the capacity of charging or discharging the energy storage unit;
when the energy storage element needs to be charged, the multiple bridge type chopper circuit absorbs energy from the half-bridge sub-module at the upper stage and stores the energy into the energy storage element; when the energy storage element needs to be discharged, the multiple bridge type chopper circuit absorbs energy from the energy storage element and stores the energy into the energy storage capacitor of the half-bridge sub-module.
2. The modular three-port dc converter according to claim 1, wherein the modular multilevel converter, the dual active bridge converter circuit and the multiple bridge chopper circuit have bidirectional energy conversion capability.
3. The modular three-port dc converter according to claim 1, wherein the modular multilevel converter is a half-bridge, full-bridge, diode-clamped, hybrid bridge, or double half-bridge clamped converter.
4. The modular three-port dc converter according to claim 1, wherein the dual active bridge converter circuit comprises a high frequency isolation transformer.
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| CN104467017A (en) * | 2014-12-24 | 2015-03-25 | 国家电网公司 | Multiport photovoltaic energy storage hybrid power generation system based on high frequency magnetic coupling |
| CN105680488A (en) * | 2016-01-27 | 2016-06-15 | 东南大学 | MMC (modular multiple converter) type multi-port power electronic transformer applied to alternating current/direct current hybrid power distribution network |
| CN106208715A (en) * | 2016-08-05 | 2016-12-07 | 南京航空航天大学 | A kind of distributed power source HVDC access system and control method thereof |
| CN107968572A (en) * | 2017-12-06 | 2018-04-27 | 浙江大学 | A kind of DC solid transformer and its control method with fault ride-through capacity |
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