CN111509983A - Isolated multi-port direct current transformer and control method thereof - Google Patents
Isolated multi-port direct current transformer and control method thereof Download PDFInfo
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- CN111509983A CN111509983A CN202010198137.8A CN202010198137A CN111509983A CN 111509983 A CN111509983 A CN 111509983A CN 202010198137 A CN202010198137 A CN 202010198137A CN 111509983 A CN111509983 A CN 111509983A
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- 238000000034 method Methods 0.000 title claims abstract description 9
- 238000004146 energy storage Methods 0.000 claims abstract description 31
- 238000006243 chemical reaction Methods 0.000 claims abstract description 23
- 238000004804 winding Methods 0.000 claims description 39
- 230000008878 coupling Effects 0.000 claims description 25
- 238000010168 coupling process Methods 0.000 claims description 25
- 238000005859 coupling reaction Methods 0.000 claims description 25
- 238000010248 power generation Methods 0.000 claims description 11
- 230000000087 stabilizing effect Effects 0.000 claims description 10
- 230000009466 transformation Effects 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims 1
- 230000005611 electricity Effects 0.000 abstract 1
- 239000003990 capacitor Substances 0.000 description 9
- 230000008859 change Effects 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 230000001131 transforming effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
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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
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
- H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
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- 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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Abstract
The invention discloses an isolated multiport direct current transformer and a control method thereof, wherein the isolated multiport direct current transformer comprises: at least one first converter, at least one second converter, at least one third converter; the first converter, the second converter and the third converter are coupled and connected; the first inverter is operable to provide electrical energy to the second inverter and the third inverter; the second converter can be used to supply electrical energy to the third converter. No matter the new energy is used for generating electricity, or the energy storage system is charged or discharged, the direct current load directly obtains electric energy from the new energy system, the energy storage system or the direct current micro-grid, and the electric energy is only subjected to primary conversion, so that the cost of the system is reduced, and the efficiency of the system is improved.
Description
Technical Field
The invention belongs to the technical field of direct current micro-grids, and particularly relates to an isolated multi-port direct current transformer and a control method thereof.
Background
With the development of new energy resources such as photovoltaic and wind power generation, a direct-current micro-grid becomes a hot point of research in recent years. However, solar energy and wind energy are greatly influenced by the environment, the output is unstable and discontinuous, and the volatility is high. In order to suppress the fluctuation of the new energy power generation system, a certain proportion of energy storage devices are generally configured in the direct current microgrid. In order to improve the safety of the direct-current micro-grid, new energy power generation systems such as photovoltaic power generation systems, wind power generation systems and the like and energy storage systems are connected to the direct-current micro-grid through an isolated dual-port DC-DC converter, and direct-current loads are also connected to the direct-current micro-grid through an isolated dual-port DC-DC converter. That is, the DC power is supplied to the DC load through the two-port DC-DC converter of the two-stage isolation type, which increases the cost of the system and reduces the energy conversion efficiency of the system.
Therefore, how to reduce the cost of the system and improve the energy conversion efficiency of the system is a problem to be solved urgently in the field.
Disclosure of Invention
In order to solve the problems, the invention provides an isolated multi-port direct current transformer and a control method thereof.
An isolated multi-port dc transformer, comprising:
at least one first converter, at least one second converter, at least one third converter;
the first converter, the second converter and the third converter are coupled and connected; the first inverter is operable to provide electrical energy to the second inverter and the third inverter; the second converter can be used to supply electrical energy to the third converter.
Preferably, the first converter is used for connecting an energy system; the second converter is used for connecting a power grid system; the third converter is used for connecting a load system.
Preferably, the energy system comprises a new energy power generation system and/or an energy storage system.
Preferably, when the new energy system is an energy storage system, the second converter is further configured to provide electric energy to the first converter.
Preferably, the isolated multi-port dc transformer further comprises a coupling unit,
and the coupling unit is used for coupling and connecting the first converter, the second converter and the third converter.
Preferably, the first converter includes:
a voltage adjusting unit for realizing voltage matching between the first converter and the second converter;
and the first conversion unit is used for realizing the interconversion of the direct current of the voltage regulation unit and the high-frequency alternating current of the first winding of the coupling unit.
Preferably, the voltage adjusting unit is a BUCK-BOOST converter;
and/or the first conversion unit is a full-bridge converter.
Preferably, the first converter further includes:
and one end of the soft switching unit is connected with one end of the first transformation unit, and the other end of the soft switching unit is connected with the first winding of the coupling unit.
Preferably, the second converter includes a second conversion unit,
the second conversion unit is used for converting direct current of a power grid system and high-frequency alternating current of a second winding of the coupling unit into each other,
the second end of the second transformation unit is connected with the second winding of the coupling unit.
Preferably, the second conversion unit is a full-bridge converter.
Preferably, the third converter includes:
one end of the rectifying unit is connected with the third winding of the coupling unit and is used for converting alternating current into direct current;
and the voltage stabilizing unit is connected with the other end of the rectifying unit and is used for stabilizing the voltage of the output end of the rectifying unit and supplying constant voltage power to the direct current load.
Preferably, the rectifying unit is a bridge rectifier circuit;
and/or the voltage stabilizing unit is a BUCK circuit.
A control method of an isolated multi-port direct current transformer comprises at least one first converter, at least one second converter and at least one third converter which are connected in a coupling mode;
the first converter is connected with an energy system; the second converter is connected with a power grid system; the third converter is connected with a load system;
supplying electrical energy to the second inverter and the third inverter through the first inverter; and/or providing electrical energy to the first converter and the third converter through the second converter.
The isolated multi-port direct current transformer provided by the invention has the advantages that no matter new energy is used for power generation, or an energy storage system is charged or discharged, a direct current load directly obtains electric energy from the new energy system, the energy storage system or a direct current micro-grid, the electric energy is only subjected to primary conversion, the cost of the system is reduced, and the efficiency of the system is improved.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Fig. 1 is a circuit diagram of an isolated multi-port dc transformer according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment discloses an isolated multi-port direct current transformer, which comprises:
at least one first converter, at least one second converter, at least one third converter;
the first converter, the second converter and the third converter are coupled and connected; the first inverter is operable to provide electrical energy to the second inverter and the third inverter; the second converter can be used to supply electrical energy to the third converter.
Wherein the first converter is used for connecting an energy system; the second converter is used for connecting a power grid system; the third converter is used for connecting a load system. The energy system comprises a new energy power generation system and/or an energy storage system.
It should be noted that, when the new energy system is an energy storage system, the second converter is further configured to provide electric energy to the first converter.
Specifically, the isolated multi-port direct current transformer further comprises a coupling unit,
and the coupling unit is used for coupling and connecting the first converter, the second converter and the third converter.
This embodiment describes an isolated multi-port dc transformer according to this embodiment by referring to fig. 1. Specifically, the isolated multi-port dc transformer of this embodiment is configured to have three ports, that is, the isolated multi-port dc transformer includes a first converter, a second converter and a third converter. The energy system is set as a new energy system or an energy storage system, the power grid system is set as a direct-current micro-power grid, and the load system is set as a direct-current load. It should be noted that, a plurality of third converters described in this embodiment may be provided according to the requirements of the load.
Specifically, the isolated multi-port dc transformer according to this embodiment includes:
the first converter is connected with the new energy system or the energy storage system and used for supplying power to a direct current load and/or a direct current microgrid;
the second converter is connected with the direct-current microgrid and used for supplying power to the energy storage system and/or the direct-current load;
the third converter is connected with the direct current load and used for supplying power to the direct current load at a constant voltage;
and the coupling unit is respectively connected with the first converter, the second converter and the third converter, and is used for coupling and connecting the first converter, the second converter and the third converter. Specifically, the coupling unit in the present embodiment adopts a three-winding high-frequency transformer, but is not limited to this expression.
It should be noted that, as shown in fig. 1, in this embodiment, the isolated multi-port dc transformer provides a port for accessing the energy system, i.e., port 1, through the first converter, the isolated multi-port dc transformer provides a port for accessing the power grid system, i.e., port 2, through the second converter, and the isolated multi-port dc transformer provides a port for accessing the power grid system, i.e., port 3, through the third converter. Specifically, the three-winding high-frequency transformer is composed of three windings, wherein a winding of the first converter is named as a first winding, a winding of the second converter is named as a second winding, and a winding of the third converter is named as a third winding.
In the isolated multi-port dc transformer of this embodiment, the first converter is connected to the new energy system or the energy storage system, the second converter is connected to the dc microgrid, and the third converter is connected to the dc load, so as to realize electrical isolation between the new energy system or the energy storage system, the dc microgrid, and the dc load, and also realize direct conversion of electric energy between three ports. Specifically, when the new energy system generates power or the energy storage system discharges, the first converter directly supplies power to a direct current load of the third converter, and meanwhile, the first converter also supplies power to a direct current microgrid of the second converter; when the energy storage system is charged, the direct current microgrid charges the energy storage system of the first converter through the second converter, and simultaneously supplies power to a direct current load of the third converter directly.
In the isolated multi-port direct current transformer, no matter new energy is used for power generation, or an energy storage system is charged or discharged, a direct current load directly obtains electric energy from the new energy system, the energy storage system or a direct current microgrid, namely, only through one-level change, the cost of the system is reduced, and the efficiency of the system is improved.
Wherein the first converter comprises:
the first end of the voltage adjusting unit is connected with the new energy system or the energy storage system and used for adjusting the voltage of the new energy system or the energy storage system to realize voltage matching between the new energy system or the energy storage system and the direct-current microgrid;
and the first end of the first conversion unit is connected with the second end of the voltage regulation unit, and the first conversion unit is used for converting the direct current of the voltage regulation unit and the high-frequency alternating current of the first winding of the three-winding high-frequency transformer into each other.
Specifically, the BUCK-BOOST converter is composed of a fifth switching device S5, a sixth switching device S6 and a first inductor L1, wherein an emitter of the fifth switching device S5 is connected to a collector of the sixth switching device S6, a second end of the first inductor L1 is connected to an emitter of the fifth switching device S5, and a first end of the first inductor L1 is used as an external circuit access port of the first converter.
The present embodiment also provides a circuit representation of the full-bridge inverter, and it should be noted that the structure of the full-bridge inverter is not limited to this circuit representation. Specifically, the first full-bridge inverter is composed of a first switching device S1, a second switching device S2, a third switching device S3, a fourth switching device S4 and a first capacitor C1. The switching device in this embodiment may be an IGBT, but is not limited to an IGBT. Wherein an emitter of the first switching device S1 is connected with a collector of a second switching device S2; a collector of the first switching device S1 is connected with a collector of the third switching device S3; an emitter of the third switching device S3 is connected to a collector of the fourth switching device S4; an emitter of the second switching device S2 is connected to an emitter of the fourth switching device S4, wherein two ends of the first capacitor C1 are connected to a collector of the first switching device S1 and an emitter of the second switching device S2, respectively.
In order to protect the switching devices, the first switching device S1, the second switching device S2, the third switching device S3, the fourth switching device S4, the fifth switching device S5 and the sixth switching device S6 are all connected in parallel with a diode in an inverse direction.
The first end of the BUCK-BOOST converter is connected to the new energy system or the energy storage system, that is, the first end of the first inductor L1 and the emitter of the sixth switching device S6 are connected to the new energy system or the energy storage system, respectively, the second end of the BUCK-BOOST converter is connected to the first end of the first full-bridge converter, that is, the collector of the fifth switching device S5 and the emitter of the sixth switching device S6 are connected to the collector of the first switching device S1 and the emitter of the second switching device S2, respectively.
It should be noted that, in the process of turning on and off the switch, the voltage and the current of the first converter are not 0, and overlap occurs, so that there is a serious switching loss, and the speed of voltage and current change is fast, and the waveform overshoots, thereby generating switching noise.
In order to avoid the above-mentioned serious switching loss and switching noise phenomenon, the isolated multi-port dc transformer according to this embodiment further includes:
a soft switching unit for reducing noise switching loss and switching noise,
and the first end of the soft switching unit is connected with the second end of the first conversion unit, and the second end of the soft switching unit is connected with the first winding of the three-winding high-frequency transformer.
Specifically, the soft switching unit in this embodiment adopts a resonant unit formed by a resonant capacitor unit CR and a resonant inductor unit L R, wherein a first end of the resonant capacitor unit CR is connected to the emitter of the first switching device S1, and a second end of the resonant capacitor unit CR is connected to the first end of the resonant inductor unit L R.
When a new energy source or an energy storage power source exchanges electric energy with the direct-current micro-grid, CR and L R form resonance to realize soft switching, and the BUCK-BOOST converter realizes voltage matching of the first converter and the second converter, so that circulating current is reduced.
In this embodiment, the second terminal of the resonant inductor unit L R and the emitter of the third switching device S3 together form the second terminal of the first dc-to-dc converter, that is, the second terminal of the resonant inductor unit L R and the emitter of the third switching device S3 are respectively connected to two terminals of the first winding of the three-winding high-frequency transformer.
Wherein the second converter includes a second conversion unit,
the first end of the second conversion unit is connected with the direct current microgrid and is used for converting direct current of the direct current microgrid and high-frequency alternating current of a second winding of the three-winding high-frequency transformer,
and the second end of the second conversion unit is connected with the second winding of the three-winding high-frequency transformer.
Specifically, the second conversion unit described in this embodiment is a full-bridge converter. For the sake of convenience of distinction, the full-bridge inverter of the second conversion unit is named as the second full-bridge inverter in this embodiment. The second full-bridge inverter is composed of a seventh switching device S7, an eighth switching device S8, a ninth switching device S9, a tenth switching device S10 and a second capacitor C2.
Wherein an emitter of the seventh switching device S7 is connected to a collector of the eighth switching device S8; a collector of the seventh switching device S7 is connected to a collector of the ninth switching device S9; an emitter of the ninth switching device S9 is connected to a collector of a tenth switching device S10; an emitter of the eighth switching device S8 is connected to an emitter of the tenth switching device S10, wherein two ends of the second capacitor C2 are connected to a collector of the first switching device S1 and an emitter of the eighth switching device S8, respectively.
Specifically, in this embodiment, the collector of the seventh switching device S7 and the emitter of the eighth switching device S8 form a first terminal of the second converting unit, and the emitter of the seventh switching device S7 and the emitter of the ninth switching device S9 form a second terminal of the second converting unit. A first end of the second conversion unit is connected to the dc microgrid, that is, a collector of the seventh switching device S7 and an emitter of the eighth switching device S8 are connected to the dc microgrid, respectively. The second end of the second transforming unit is connected with the second winding of the three-winding high-frequency transformer, that is, the emitter of the seven switching device S7 and the emitter of the ninth switching device S9 form the second end of the second transforming unit and are respectively connected with two ends of the second winding of the three-winding high-frequency transformer.
It should be noted that, in order to protect the switching devices, the seventh switching device S7, the eighth switching device S8, the ninth switching device S9 and the tenth switching device S10 are all connected in parallel with a diode in an inverse manner.
Wherein the third converter comprises:
the first end of the rectifying unit is connected with the third winding of the three-winding high-frequency transformer and used for converting alternating current into direct current;
and the voltage stabilizing unit is connected with the second end of the rectifying unit and used for stabilizing the voltage of the output end of the rectifying unit and supplying constant voltage power to the direct current load.
Specifically, the rectifying unit in this embodiment is a bridge rectifier circuit, and the voltage stabilizing unit is a BUCK circuit, that is, a BUCK chopper circuit. No matter the new energy power generation or the energy storage system discharges or the direct current microgrid supplies power, the third converter is stabilized by the BUCK circuit, and constant voltage power supply of the direct current load is achieved.
The bridge rectifier circuit is composed of a first diode D1, a second diode D2, a third diode D3, a fourth diode D4 and a third capacitor C3. The cathode of the first diode D1 is connected to the cathode of the third diode D3, the anode of the first diode D1 is connected to the cathode of the second diode D2, the anode of the third diode D3 is connected to the cathode of the fourth diode D4, the anode of the second diode D2 is connected to the anode of the fourth diode D4, and two ends of the third capacitor C3 are connected to the cathode of the third diode D3 and the anode of the fourth diode D4, respectively. Wherein an anode of the first diode D1 and an anode of the third diode D3 constitute a first terminal of the rectifying unit, and a cathode of the third diode D3 and an anode of the fourth diode D4 constitute a second terminal of the rectifying unit.
The first end of the rectifying unit is connected to the third winding of the three-winding high-frequency transformer, that is, the anode of the first diode D1 and the anode of the third diode D3 are respectively connected to two ends of the third winding of the three-winding high-frequency transformer.
Specifically, the BUCK circuit is composed of an eleventh switching device S11, a fifth diode D5 and a second inductor L2, wherein the eleventh switching device S11 is connected in reverse parallel with a diode, an emitter of the eleventh switching device S11 is connected to a cathode of the fifth diode D5, an emitter of the eleventh switching device S11 is further connected to a first end of the second inductor L2, a collector of the eleventh switching device S11 and an anode of the fifth diode D5 form the first end of the BUCK circuit, and a second end of the second inductor L2 and an anode of the fifth diode D35 5 form the second end of the BUCK circuit.
It should be noted that, the voltage stabilizing unit in this embodiment is connected to the second end of the rectifying unit, that is, the collector of the eleventh switching device S11 and the anode of the fifth diode D5 are respectively connected to the cathode of the third diode D3 and the anode of the fourth diode D4, and the second end of the second inductor L2 and the anode of the fifth diode D5 are respectively connected to a dc load.
The embodiment also provides a control method of the isolated multi-port direct current transformer,
the isolated multi-port direct current transformer comprises at least one first converter, at least one second converter and at least one third converter which are connected in a coupling mode;
the first converter is connected with an energy system; the second converter is connected with a power grid system; the third converter is connected with a load system;
supplying electrical energy to the second inverter and the third inverter through the first inverter; and/or to supply electrical energy to the third converter via the second converter.
The energy system is an energy storage system, and when the energy storage system is charged, the isolated multi-port direct current transformer further controls the second converter to provide electric energy for the third converter.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (13)
1. An isolated multi-port dc transformer, comprising:
at least one first converter, at least one second converter, at least one third converter;
the first converter, the second converter and the third converter are coupled and connected; the first inverter is operable to provide electrical energy to the second inverter and a third inverter; the second inverter is operable to provide electrical energy to the third inverter.
2. The isolated multiport direct current transformer according to claim 1, characterized in that the first converter is used for connecting an energy system; the second converter is used for connecting a power grid system; the third converter is used for connecting a load system.
3. The isolated multiport direct current transformer according to claim 2, characterized in that the energy system comprises a new energy power generation system and/or an energy storage system.
4. The isolated multiport direct current transformer according to claim 3, characterized in that when the new energy system is an energy storage system, the second converter is further used for providing electric energy to the first converter.
5. The isolated multiport DC transformer according to claim 1, further comprising a coupling unit,
and the coupling unit is used for coupling and connecting the first converter, the second converter and the third converter.
6. The isolated multiport DC transformer according to claim 5, characterized in that said first converter comprises:
a voltage adjusting unit for realizing voltage matching between the first converter and the second converter;
and the first conversion unit is used for realizing the interconversion of the direct current of the voltage adjusting unit and the high-frequency alternating current of the first winding of the coupling unit.
7. The isolated multiport direct current transformer according to claim 6, characterized in that the voltage regulating unit is a BUCK-BOOST converter;
and/or the first conversion unit is a full-bridge converter.
8. The isolated multiport DC transformer according to claim 6 or 7, characterized in that the first converter further comprises:
and one end of the soft switching unit is connected with one end of the first transformation unit, and the other end of the soft switching unit is connected with the first winding of the coupling unit.
9. The isolated multiport DC transformer according to claim 5, wherein said second converter comprises a second conversion unit,
the second conversion unit is used for realizing the interconversion between the direct current of the power grid system and the high-frequency alternating current of the second winding of the coupling unit,
the second end of the second transformation unit is connected with the second winding of the coupling unit.
10. The isolated multiport direct current transformer according to claim 9, characterized in that the second converter unit is a full-bridge converter.
11. The isolated multiport DC transformer according to claim 1, characterized in that said third converter comprises:
one end of the rectifying unit is connected with the third winding of the coupling unit and is used for converting alternating current into direct current;
and the voltage stabilizing unit is connected with the other end of the rectifying unit and is used for stabilizing the voltage of the output end of the rectifying unit and supplying constant voltage power to the direct current load.
12. The isolated multiport direct current transformer according to claim 11, wherein the rectifying unit is a bridge rectifying circuit;
and/or the voltage stabilizing unit is a BUCK circuit.
13. A control method of an isolated multi-port direct current transformer is characterized in that,
the isolated multi-port direct current transformer comprises at least one first converter, at least one second converter and at least one third converter which are connected in a coupling mode;
the first converter is connected with an energy system; the second converter is connected with a power grid system; the third converter is connected with a load system;
providing electrical energy to the second and third inverters through the first inverter; and/or providing electrical energy to the first and third inverters through the second inverter.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114285019A (en) * | 2021-12-20 | 2022-04-05 | 北京机电工程研究所 | Energy router and converter formed based on interconnection of isolated four-port converters |
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| CN211959068U (en) * | 2020-03-19 | 2020-11-17 | 深圳供电局有限公司 | Isolated multiport direct current transformer |
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| CN108418200A (en) * | 2018-03-14 | 2018-08-17 | 华北电力大学（保定） | A kind of voltage hierarchical coordinative control method suitable for direct-current grid |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114285019A (en) * | 2021-12-20 | 2022-04-05 | 北京机电工程研究所 | Energy router and converter formed based on interconnection of isolated four-port converters |
| CN114285019B (en) * | 2021-12-20 | 2023-11-03 | 北京机电工程研究所 | Energy router and converter based on interconnection of isolated four-port converters |
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