CN115762996A - Hybrid electric energy router based on three-dimensional core type multi-winding transformer - Google Patents
Hybrid electric energy router based on three-dimensional core type multi-winding transformer Download PDFInfo
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- CN115762996A CN115762996A CN202211288517.6A CN202211288517A CN115762996A CN 115762996 A CN115762996 A CN 115762996A CN 202211288517 A CN202211288517 A CN 202211288517A CN 115762996 A CN115762996 A CN 115762996A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/24—Magnetic cores
- H01F27/245—Magnetic cores made from sheets, e.g. grain-oriented
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
- H01F27/306—Fastening or mounting coils or windings on core, casing or other support
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/02—Circuit arrangements for ac mains or ac distribution networks using a single network for simultaneous distribution of power at different frequencies; using a single network for simultaneous distribution of ac power and of dc power
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The invention discloses a hybrid electric energy router based on a three-dimensional core type multi-winding transformer, which comprises 3 three-dimensional core type multi-winding transformers, a series converter, a parallel converter and a controller, wherein the three-dimensional core type multi-winding transformers are connected with the controller through the three-dimensional core type multi-winding transformer; the high-voltage winding of the 3 three-dimensional core type multi-winding transformers adopts a triangular connection or star connection mode to form a medium-high voltage alternating current port, the low-voltage winding adopts a star connection mode or star connection mode to form a low-voltage three-phase alternating current port, the series winding adopts a star connection mode to be connected with the alternating current side of the series current transformer, and the parallel winding adopts a star connection mode to be connected with the alternating current side of the parallel current transformer; the series converter is connected with the direct current side of the parallel converter to form a low-voltage direct current port; the controller controls and connects the series converter and the parallel converter. The three-core type multi-winding transformer has symmetrical magnetic circuits of three core columns, reduces the material use and the iron loss, realizes active regulation and control by matching with a small amount of converters, and has low topological structure and control complexity.
Description
Technical Field
The invention belongs to the technical field of flexible alternating current and direct current distribution, and particularly relates to a hybrid electric energy router based on a three-dimensional core type multi-winding transformer.
Background
With the development of power users to diversification, distributed/energy storage grid-connected operation and the continuous expansion of the scale of a power distribution network, the access pressure of the power distribution network is higher and higher, and the development of emerging technology frameworks such as a micro-grid, an active power distribution network, a smart grid and an autonomous power distribution network is rapid around how to improve the access level of a distributed power supply. With the development of modern power electronic technology and advanced control theory, large-capacity power electronic conversion equipment has the capacity of bidirectional energy flow, conversion, regulation and management. The electric energy router is used as a core interface, and networking in the form of a microgrid is one of feasible schemes, so that the electric energy router gradually draws attention of domestic and foreign scholars. The electric energy router has the outstanding characteristics that the solid-state module can control the voltage amplitude and the phase at the input and output sides in real time, can realize flexible regulation of voltage, current and power, and is an ideal interface device between a micro-grid and a power distribution network.
At present, the electric energy router mostly adopts two types of topological structure schemes based on full electric power electronic modules in a cascade H-bridge form and a modular multilevel form. However, there are still many challenges in replacing the traditional AC/AC power frequency transformer with an electric energy router based on full power electronic power module in the AC power distribution system, and the most prominent problems are the high cost and large loss of the electric energy router. For example, compared with the traditional industrial frequency transformer, the electric energy router of 1MVA 10kV/400V has the cost more than 5 times of the cost of the former and the loss more than 3 times of the latter. The poor technical economy makes the electric energy router based on the full-electric electronic power module difficult to popularize and apply in the power grid on a large scale at the present stage.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a three-column three-dimensional multi-winding transformer which comprises a three-column three-dimensional magnetic circuit structure and four windings; the three-column three-dimensional magnetic circuit structure comprises three iron core columns, an upper iron yoke and a lower iron yoke; the three core legs are spatially symmetrical; the upper iron yokes are connected and arranged at the upper ends of the two adjacent iron core columns, and the lower iron yokes are connected and arranged at the lower ends of the two adjacent iron core columns; the four windings are a high-voltage winding W1, a series winding W2, a low-voltage winding W3 and a parallel winding W4; the low-voltage winding W3 and the parallel winding W4 are wound on the same core limb, and the high-voltage winding W1 and the series winding W2 are respectively wound on the other two core limbs.
Based on the above, the core limb, the upper iron yoke and the lower iron yoke are all formed by stacking a plurality of silicon steel sheets or amorphous alloy material thin plates.
The invention provides a hybrid electric energy router based on a three-dimensional core type multi-winding transformer, which comprises 3 three-dimensional core type multi-winding transformers, a series converter, a parallel converter and a controller; the high-voltage winding of 3 stereoscopic core type multi-winding transformers adopts the triangular connection or star connection mode to form the medium-high voltage AC port, the low-voltage winding adopts the star connection or star connection mode to form the low-voltage three-phase AC port, the series winding adopts the star connection mode to link with AC side of the said series converter, the parallel winding adopts the star connection mode to link with AC side of the said parallel converter; the direct current sides of the series current transformer and the parallel current transformer are connected to form a low-voltage direct current port; the controller controls and connects the series converter and the parallel converter.
Based on the above, the series converter includes a DC/AC power conversion module and an LC filter, and an AC side of the DC/AC power conversion module is connected to an inductance end of the LC filter; and the capacitance end of the LC filter is connected with the series winding W2 of the star connection.
Based on the above, the DC/AC power conversion module adopts a three-phase two-level topology, a three-phase three-level topology, or a three-phase modular multi-level topology; the topological structure of the DC/AC power conversion module adopts a switching device which is a Si-IGBT, a Si-MOSFET or a SiC-MOSFET with a freewheeling diode.
Based on the above, the parallel converter comprises an AC/DC power conversion module and a filter, wherein the AC side of the AC/DC power conversion module is connected to one end of the inductor of the filter, and the other end of the inductor of the filter is connected to the star-coupled parallel winding W4; the filter of the parallel converter adopts an L-type, LC-type or LCL-type filter.
Based on the above, the AC/DC power conversion module adopts a three-phase two-level topology, a three-phase three-level topology, or a three-phase modular multi-level topology; the topological structure of the AC/DC power conversion module adopts a switching device which is a Si-IGBT, a Si-MOSFET or a SiC-MOSFET with a freewheeling diode.
The invention provides a power distribution system based on the hybrid electric energy router based on the three-dimensional core type multi-winding transformer, a medium-high voltage alternating current port of the hybrid electric energy router based on the three-dimensional core type multi-winding transformer is connected to a medium-high voltage power distribution network, a low-voltage alternating current port is connected with an alternating current load terminal, an alternating current type energy storage device and an alternating current type new energy power generation device through an alternating current bus, and a low-voltage direct current port is connected with a direct current load terminal, a direct current type energy storage device and a direct current type new energy power generation device through a direct current bus.
The invention provides a control method of a power distribution system based on the hybrid electric energy router, wherein the controller controls the series converter and the parallel converter in a direct control mode and an indirect control mode; the method for controlling the series converter and the parallel converter in a direct control mode comprises the following steps: controlling the series converter to be a sinusoidal current source by taking a current fundamental component of a 10kV alternating current power grid and a low-voltage direct current bus voltage as control variables; the voltage fundamental wave component of the low-voltage alternating-current power grid is used as a control variable, and the parallel converter is controlled to be a sinusoidal voltage source; the method for controlling the series converter and the parallel converter in an indirect control mode comprises the following steps: controlling the series converter as a non-sinusoidal voltage source by taking the voltage fluctuation amount and distortion amount of a 10kV alternating current power grid as control variables; and controlling the parallel converter to be a non-sinusoidal current source by taking the current reactive power of the low-voltage alternating current power grid, the distortion and the voltage of the low-voltage direct current bus as control variables.
Compared with the prior art, the invention has the following characteristics:
(1) Compared with a planar three-core-column transformer, the three-core-type multi-winding transformer has symmetrical three-core-column magnetic circuits, and is beneficial to reducing material use and iron loss;
(2) The low-voltage alternating-current voltage is regulated and controlled through the series winding of the three-dimensional core type multi-winding transformer and the series converter, and power electronic devices are partially adopted while the node electric energy is controlled, so that the economy is improved;
(3) Compared with an electric energy router based on a full power electronic power module, the three-dimensional core type multi-winding transformer is low in price and mature in technology, active regulation and control can be achieved only through a small number of power electronic converters, a multi-level multi-stage cascade structure is not needed generally, the topological structure and control complexity are low, and investment cost is greatly reduced.
Drawings
Fig. 1 is a schematic structural diagram of a solid core type multi-winding transformer provided in embodiment 1 of the present invention.
Fig. 2 is a schematic structural diagram of a hybrid electric energy router provided in embodiment 2 of the present invention.
Fig. 3 is a Dyn wiring schematic diagram of a solid core type multi-winding transformer in a hybrid electric energy router according to embodiment 2 of the present invention.
Fig. 4 is a first configuration diagram of the series converter and the parallel converter in embodiment 2 of the present invention.
Fig. 5 is a second configuration diagram of the series converter and the parallel converter in embodiment 2 of the present invention.
Fig. 6 is a third configuration diagram of the series converter and the parallel converter in embodiment 2 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
As shown in fig. 1, the present embodiment provides a three-dimensional core type multi-winding transformer, which includes a three-column three-dimensional magnetic circuit structure and four windings;
the three-column three-dimensional magnetic circuit structure comprises three iron core columns 1, an upper iron yoke 2 and a lower iron yoke 3; the three iron core columns 1 are symmetrical in space; the upper ends of two adjacent iron core columns 1 are connected with the upper iron yoke 2, and the lower ends of two adjacent iron core columns 1 are connected with the lower iron yoke 3; the four windings are a high-voltage winding W1, a series winding W2, a low-voltage winding W3 and a parallel winding W4; the low-voltage winding W3 and the parallel winding W4 are wound on the same core limb 1, and the high-voltage winding W1 and the series winding W2 are respectively wound on the other two core limbs 1.
Specifically, the core limb, the upper iron yoke and the lower iron yoke are formed by stacking a plurality of silicon steel sheets or amorphous alloy material sheets.
Example 2
As shown in fig. 2, the present embodiment provides a hybrid electric energy router based on a three-dimensional core type multi-winding transformer, which includes 3 three-dimensional core type multi-winding transformers, series converters, parallel converters and a controller described in embodiment 1;
the high-voltage winding of 3 stereoscopic core type multi-winding transformers adopts the mode of delta connection or star connection to form the middle and high voltage AC port used for connecting into 10kV AC power network, the low-voltage winding adopts the mode of star connection or star connection to form the 400V low-voltage three-phase AC port, the series winding adopts the mode of star connection to link with AC side of the said series converter, the parallel winding adopts the mode of star connection to link with AC side of the said parallel converter;
the series converter is connected with the direct current side of the parallel converter to form a low-voltage direct current port of +/-375V or +/-750V;
and the controller is used for controlling and connecting the series converter and the parallel converter.
FIG. 3 shows a Dyn wiring diagram of 3 three-dimensional core type multi-winding transformers, wherein high-voltage windings are connected in a triangular mode to form three-phase ports A, B and C; the low-voltage winding adopts a star connection mode to form a three-phase four-wire alternating current port a, b, c and n; the series winding adopts a star connection mode to form a U, V and W three-phase alternating current port; the parallel windings are connected in a star type mode to form an x, y and z three-phase alternating current port.
In particular, fig. 4-6 illustrate various configurations of series converters and parallel converters that may be used. The series converter comprises a DC/AC power conversion module and an LC filter, and the AC side of the DC/AC power conversion module is connected with the inductance end of the LC filter; and the capacitance end of the LC filter is connected with the series winding W2 of the star connection. The DC/AC power conversion module adopts a three-phase two-level topology, a three-phase three-level topology or a three-phase modular multi-level topology; the topological structure of the DC/AC power conversion module adopts a switching device which is a Si-IGBT, a Si-MOSFET or a SiC-MOSFET with a freewheeling diode.
The parallel converter comprises an AC/DC power conversion module and a filter, the alternating current side of the AC/DC power conversion module is connected with one end of an inductor of the filter, and the other end of the inductor of the filter is connected with a star-shaped parallel winding W4; the filter of the parallel converter adopts an L-type, LC-type or LCL-type filter. The AC/DC power conversion module adopts a three-phase two-level topology, a three-phase three-level topology or a three-phase modular multi-level topology; the topological structure of the AC/DC power conversion module adopts a switching device which is a Si-IGBT, a Si-MOSFET or a SiC-MOSFET with a freewheeling diode.
Example 3
This embodiment provides a power distribution system of a hybrid electric energy router based on a three-dimensional core type multi-winding transformer according to embodiment 2, as shown in fig. 2, a medium-high voltage ac port of the hybrid electric energy router based on the three-dimensional core type multi-winding transformer is connected to a medium-high voltage power distribution network, a low-voltage ac port is connected to an ac load terminal, an ac energy storage device and an ac new energy power generation device through an ac bus, and a low-voltage dc port is connected to a dc load terminal, a dc energy storage device and a dc new energy power generation device through a dc bus.
Example 4
The embodiment provides a control method of a power distribution system of a hybrid electric energy router, which is described in embodiment 3, wherein the controller controls the series converter and the parallel converter by adopting two modes, namely direct control and indirect control, based on the detected voltages and currents of a 10kV alternating current grid, a 400V low-voltage three-phase alternating current port and a low-voltage direct current port;
the method for controlling the series converter and the parallel converter in a direct control mode comprises the following steps:
controlling the series converter to be a sinusoidal current source by taking a current fundamental component of a 10kV alternating current power grid and the voltage of a low-voltage direct current bus as control variables; the current and the voltage of a 10kV alternating current power grid are in the same frequency and phase, unit power factor is realized, and the voltage of a direct current bus is stabilized;
the low-voltage AC power grid voltage fundamental wave component is used as a control variable, the parallel converter is controlled to be a sinusoidal voltage source, and the low-voltage AC power grid voltage is controlled to be stabilized at a given sinusoidal voltage and a given phase reference value;
the method for controlling the series converter and the parallel converter in an indirect control mode comprises the following steps:
controlling the series converter to be a non-sinusoidal voltage source by taking the voltage fluctuation amount and distortion amount of a 10kV alternating current power grid as control variables; compensating the fluctuation and distortion of the power grid voltage to ensure that the low-voltage alternating-current power grid voltage is stabilized at a given sinusoidal voltage and phase reference value;
the current reactive power, the distortion and the low-voltage direct-current bus voltage of a low-voltage alternating-current power grid are used as control variables, and the parallel converter is controlled to be a non-sinusoidal current source; the active power of the exchange of the low-voltage alternating current port and the low-voltage direct current port is controlled, the reactive power and harmonic current of a load are compensated, the current of a 10kV alternating current network is controlled to be a sine waveform of a unit power factor, and meanwhile, the direct current bus voltage is stabilized.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. The utility model provides a three-dimensional heart formula multi-winding transformer which characterized in that:
the three-column three-dimensional magnetic circuit structure comprises a three-column three-dimensional magnetic circuit structure and four windings;
the three-column three-dimensional magnetic circuit structure comprises three iron core columns, an upper iron yoke and a lower iron yoke;
the three core legs are spatially symmetrical;
the upper iron yoke is connected and arranged at the upper ends of two adjacent iron core columns, and the lower iron yoke is connected and arranged at the lower ends of two adjacent iron core columns;
the four windings are a high-voltage winding W1, a series winding W2, a low-voltage winding W3 and a parallel winding W4;
the low-voltage winding W3 and the parallel winding W4 are wound on the same core limb, and the high-voltage winding W1 and the series winding W2 are respectively wound on the other two core limbs.
2. The stereocentric multi-winding transformer according to claim 1, characterized in that: the iron core column, the upper iron yoke and the lower iron yoke are formed by stacking a plurality of silicon steel sheets or amorphous alloy material sheets.
3. The utility model provides a hybrid electric energy router based on three-dimensional heart formula multi-winding transformer which characterized in that: comprising 3 stereocore multi-winding transformers, series converters, parallel converters and controllers according to claim 1 or 2;
the high-voltage winding of 3 stereoscopic core type multi-winding transformers adopts the triangular connection or star connection mode to form the medium-high voltage AC port, the low-voltage winding adopts the star connection or star connection mode to form the low-voltage three-phase AC port, the series winding adopts the star connection mode to link with AC side of the said series converter, the parallel winding adopts the star connection mode to link with AC side of the said parallel converter;
the direct current sides of the series converter and the parallel converter are connected to form a low-voltage direct current port;
the controller controls and connects the series converter and the parallel converter.
4. The stereocore multi-winding transformer based hybrid electrical energy router of claim 3, wherein:
the series converter comprises a DC/AC power conversion module and an LC filter, wherein the AC side of the DC/AC power conversion module is connected with the inductance end of the LC filter; and the capacitance end of the LC filter is connected with the series winding W2 of the star connection.
5. The stereocentric multi-winding transformer-based hybrid electrical energy router of claim 4, wherein: the DC/AC power conversion module adopts a three-phase two-level topology, a three-phase three-level topology or a three-phase modular multi-level topology; the topological structure of the DC/AC power conversion module adopts a switching device which is a Si-IGBT, a Si-MOSFET or a SiC-MOSFET with a freewheeling diode.
6. The stereocore multi-winding transformer based hybrid electrical energy router of claim 3, wherein: the parallel converter comprises an AC/DC power conversion module and a filter, the alternating current side of the AC/DC power conversion module is connected with one end of an inductor of the filter, and the other end of the inductor of the filter is connected with a star-shaped parallel winding W4; the filter of the parallel current transformer adopts an L-type, LC-type or LCL-type filter.
7. The stereocore multi-winding transformer based hybrid electrical energy router of claim 6, wherein: the AC/DC power conversion module adopts a three-phase two-level topology, a three-phase three-level topology or a three-phase modular multi-level topology; the topological structure of the AC/DC power conversion module adopts a switching device which is a Si-IGBT, a Si-MOSFET or a SiC-MOSFET with a freewheeling diode.
8. A power distribution system based on a hybrid electric energy router based on a stereocentric multi-winding transformer as claimed in any one of claims 3-7, characterized in that:
the hybrid electric energy router based on the three-dimensional core type multi-winding transformer is characterized in that a middle-high voltage alternating current port of the hybrid electric energy router is connected to a middle-high voltage power distribution network, a low-voltage alternating current port is connected with an alternating current load terminal, an alternating current type energy storage device and an alternating current type new energy power generation device through an alternating current bus, and a low-voltage direct current port is connected with a direct current load terminal, a direct current type energy storage device and a direct current type new energy power generation device through a direct current bus.
9. A method for controlling a power distribution system of a hybrid electric energy router according to claim 8, wherein:
the controller controls the series converter and the parallel converter in a direct control mode and an indirect control mode;
the method for controlling the series converter and the parallel converter in a direct control mode comprises the following steps:
controlling the series converter to be a sinusoidal current source by taking a current fundamental component of a 10kV alternating current power grid and a low-voltage direct current bus voltage as control variables; controlling the parallel converter as a sinusoidal voltage source by taking a voltage fundamental component of a low-voltage alternating-current power grid as a control variable;
the method for controlling the series converter and the parallel converter in an indirect control mode comprises the following steps:
controlling the series converter as a non-sinusoidal voltage source by taking the voltage fluctuation amount and distortion amount of a 10kV alternating current power grid as control variables; and controlling the parallel converter as a non-sinusoidal current source by taking the current reactive power of the low-voltage alternating current power grid, the distortion and the voltage of the low-voltage direct current bus as control variables.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210682100.1A CN115064360A (en) | 2022-06-16 | 2022-06-16 | Hybrid electric energy router based on three-dimensional heart type multi-winding transformer |
| CN2022106821001 | 2022-06-16 |
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| CN115762996A true CN115762996A (en) | 2023-03-07 |
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| CN202210682100.1A Pending CN115064360A (en) | 2022-06-16 | 2022-06-16 | Hybrid electric energy router based on three-dimensional heart type multi-winding transformer |
| CN202211288517.6A Pending CN115762996A (en) | 2022-06-16 | 2022-10-20 | Hybrid electric energy router based on three-dimensional core type multi-winding transformer |
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| CN202210682100.1A Pending CN115064360A (en) | 2022-06-16 | 2022-06-16 | Hybrid electric energy router based on three-dimensional heart type multi-winding transformer |
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| CN116819201B (en) * | 2023-06-12 | 2024-03-26 | 国网湖北省电力有限公司电力科学研究院 | Device and method for testing composite function of energy storage converter in distributed new energy |
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