CN112951566B - High-frequency full-control switch turn-ratio-variable current-voltage self-control transformer - Google Patents
High-frequency full-control switch turn-ratio-variable current-voltage self-control transformer Download PDFInfo
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- CN112951566B CN112951566B CN202110150009.0A CN202110150009A CN112951566B CN 112951566 B CN112951566 B CN 112951566B CN 202110150009 A CN202110150009 A CN 202110150009A CN 112951566 B CN112951566 B CN 112951566B
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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
- H01F27/40—Structural association with built-in electric component, e.g. fuse
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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
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
- H01F27/38—Auxiliary core members; Auxiliary coils or windings
- H01F27/385—Auxiliary core members; Auxiliary coils or windings for reducing harmonics
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F29/00—Variable transformers or inductances not covered by group H01F21/00
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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
- Y02E40/30—Reactive power compensation
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Abstract
The invention discloses a high-frequency full-control switch turn ratio current-voltage self-control transformer, which comprises a three-phase transformer body, and an integrated full-control switch device and a converter. The three-phase transformer comprises a primary side primary winding, a secondary side series current transformer, a secondary winding and a secondary iron core. The three-phase transformer full-control switch can adjust the transformation ratio according to a control strategy, and the secondary side voltage is changed through magnetic field coupling so as to achieve the purpose of regulating and controlling the load voltage; the secondary side series converter is a current control converter, participates in current regulation of the load side, and can efficiently restrain harmonic current.
Description
[ technical field ] A method for producing a semiconductor device
The invention belongs to the technical field of transformers, and particularly relates to a high-frequency full-control switch turn ratio current-voltage self-control transformer.
[ background of the invention ]
In recent years, renewable energy is rapidly developed, and a new situation that various centralized energy sources and distributed energy sources coexist provides challenges for the field of traditional transformers. The distribution transformer not only needs to complete voltage grade conversion and power transfer, but also needs to have the capabilities of stably maintaining supply voltage, suppressing harmonic current, performing reactive compensation, optimizing transmission power control, coordinating distribution of multi-line electric energy and flowing in multiple directions. In the background of this research, the design of intelligent transformers is the focus of the current research. Power Electronic Transformers (PET) and Hybrid Distribution Transformers (HDT) have been proposed in succession, both of which have certain control, isolation, and power flow control capabilities, but are complex in structure and generally efficient.
[ summary of the invention ]
The invention aims to overcome the defects of the prior art and provides a high-frequency full-control switch turn-ratio current-voltage self-control transformer so as to solve the problems that the transformer in the prior art is too complex and is difficult to meet the requirements of dense load and large distributed capacity of the conventional power grid.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a high-frequency full-control switch turn-ratio current-voltage self-control transformer comprises a three-phase transformer body, wherein the three-phase transformer body comprises a primary side winding and a secondary side winding, and the primary side winding is connected with a primary side compensation winding in series;
the primary side winding of each phase is connected with a high-frequency full-control switch, and the other end of the high-frequency full-control switch is connected with the tail end of the compensation winding of the other phase; the secondary side winding is connected with the load, and the secondary side winding is connected with a secondary side winding high-frequency converter in parallel.
The invention further improves the following steps:
preferably, the high-frequency fully-controlled switch in each phase comprises two sub-switches, the head end of one sub-switch is connected to the head end of the primary side winding of the phase, and the head end of the other sub-switch is connected to the tail end of the primary side winding of the phase; the tail ends of the two switches are connected, and the tail ends of the two switches are connected to the tail end of the other phase compensation winding.
Preferably, each sub-switch comprises two IGBT power devices connected in series in an opposite direction.
Preferably, the two subswitches regulate the duty cycle by PWM regulation.
Preferably, the secondary side winding high-frequency converter comprises a series current transformer, a low-pass filter and a direct-current bus capacitor; one end of the low-pass filter is connected with the secondary side winding, the other end of the low-pass filter is connected with the series current transformer, and the series current transformer is connected with the direct-current bus capacitor in parallel.
Preferably, the low-pass filter comprises three filter inductors and three filter capacitors, each filter inductor is connected with one filter capacitor, the three filter capacitors are connected with a secondary side winding of the transformer in a star connection mode, and the tail ends of the three filter capacitors are connected to a neutral point of the series converter;
each filter capacitor is connected with a filter inductor in series, and the three filter inductors are connected to the series converter.
Preferably, the series converter comprises four parallel half-bridge structures, and each half-bridge structure comprises two IGBTs connected in series.
Preferably, the bridge arms of the three half-bridge structures are respectively connected with the three filter inductors, and the bridge arm of one half-bridge structure is a neutral point.
Compared with the prior art, the invention has the following beneficial effects:
the invention discloses a high-frequency full-control switch turn ratio current-voltage self-control transformer, which comprises a three-phase transformer body, and an integrated full-control switch device and a converter. The three-phase transformer comprises a primary side primary winding, a secondary side series current transformer, a secondary winding and a secondary iron core. The three-phase transformer full-control switch can adjust the transformation ratio according to a control strategy, and the secondary side voltage is changed through magnetic field coupling so as to achieve the purpose of regulating and controlling the load voltage; the secondary side series current transformer is a current control current transformer, participates in current regulation of the load side, and can efficiently restrain harmonic current. The high-frequency full-control switch variable turn ratio voltage and current self-control distribution transformer can realize accurate control of load side voltage and efficient suppression of harmonic current through the high-frequency switch and the load side series connection converter. A compensation winding is added at the primary side to assist in stabilizing the voltage of the power grid; a compensation winding link is added in each phase of primary side winding, the compensation winding is connected with a bidirectional high-frequency switch in parallel, and when the voltage on the side of a power grid fluctuates, the conduction time of the bidirectional switch can be controlled by a PWM signal to suppress harmonic waves. Compared with a hybrid transformer, the hybrid transformer has a voltage grade conversion function, can synchronously realize accurate regulation and control of voltage and current at the load side according to different control strategies, and improves the power quality and reliability of a power grid by using a smaller volume and a simpler structure. In order to match the conditions of dense power grid load and increased distributed capacity in the future, the transformer needs to be developed to the aspects of large-capacity bearing, integrated design, light volume, high efficiency and high reliability operation.
Furthermore, the invention adopts the transformer to integrate the high-frequency full-control two-way switch device, obviously improves the control capability of the transformer to the voltage by utilizing the high-frequency control technology, optimizes the control structure, reduces the volume of the device, and realizes higher utilization rate of the ferromagnetic material and the load voltage balance requirement by using a simple structure and a lighter volume. The transformer has an isolation function, the converter integrated to the low-voltage side has a harmonic suppression function, and the technical requirement of connection with a distributed power supply is met in a light-volume and efficient mode.
Furthermore, the secondary side winding is connected with a series converter consisting of power electronic devices in parallel, the converter is formed by connecting common IGBTs in series to form a rectifier bridge, and a filter inductor is led out from a terminal connection wire and connected in. The converter operates in a current source control mode, can effectively reduce higher harmonics, purifies the current on the network side, and improves the power quality on the network side while improving the control capability.
[ description of the drawings ]
Fig. 1 is a schematic diagram of a basic structure of a high-frequency fully-controlled switch turn-ratio voltage-current self-control distribution transformer.
Fig. 2 is a schematic diagram of a high-frequency fully-controlled switch module.
Fig. 3 is a schematic diagram of an integrated fully-controlled switch module of a three-phase transformer.
Fig. 4 is a schematic diagram of an integrated current transformer configuration.
Description of reference numerals:
1-a three-phase transformer body; 2-high frequency full control switch, 3-secondary side winding high frequency converter; 4-a low-pass filter; 5-series current transformer, 6-direct current bus capacitor.
[ detailed description ] embodiments
The invention is described in further detail below with reference to the accompanying drawings:
in the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly and encompass, for example, both fixed and removable connections; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.
Referring to fig. 1, the invention discloses a high-frequency full-control switch turn ratio current-voltage self-control transformer, which comprises a three-phase transformer body 1, a high-frequency full-control switch 2 and a high-frequency converter 3 integrated to a secondary side winding.
Referring to fig. 3, wherein the three-phase transformer body includes: A. b, C three-phase primary side winding, primary side compensation winding, secondary side winding and three-phase iron core. A. The number of windings in the three-phase phases B and C is equal, the structure is the same, each phase comprises a primary side winding, a primary side compensation winding and a secondary side winding, and the windings A, B and C in the primary side windings are connected with the high-voltage side, so that the primary side windings are high-voltage side windings and are supplied with high-voltage alternating current network signals; the secondary side windings a, b, c are located on the low voltage side, thus providing a path for the low voltage side windings. The head/tail end ports of the primary side winding are sequentially as follows: A/X, B/Y, C/Z; the head/tail end ports of the secondary winding are sequentially as follows: a/x, b/y, c/z; the primary side compensation windings are respectively connected with the primary side windings of the transformer in series. A secondary side winding high-frequency converter 3 integrated on the secondary side is connected with the secondary side winding; the high-frequency full-control switch 2 is a full-control double switch, one is connected between the primary side winding and the compensation winding, and the other is connected to the tail part of the primary side winding, and the duty ratio can be automatically changed according to the control requirement, so that the turn ratio is changed, and the load voltage is regulated and controlled. The primary side winding and the primary side compensation winding are connected by adopting a triangular method, and the three-phase iron core is respectively arranged beside each phase winding and corresponds to the a/x, b/y and c/z of the secondary side winding; the head end of the secondary side winding is connected with a low pass filter 4 and then connected with a series current converter 5, the tail end of the secondary side winding is connected with the ground, and the secondary side winding is led to a load through regulating and controlling the series current converter 3, so that power transmission and load voltage stable control are realized. And a secondary side winding of the transformer body 1 is connected with the series converter 5 in parallel, three-phase ports are connected in sequence according to a-u, b-v and c-w, and a midpoint lead of a fourth bridge arm is used as a neutral point of the converter and provides a zero-sequence voltage path.
Referring to fig. 2 and fig. 3, the two high-frequency fully-controlled switches 2 have the same structure, the two high-frequency fully-controlled switches 2 are respectively S1 and S2, each high-frequency fully-controlled switch 2 is formed by connecting two IGBT power devices in series in an opposite direction, one end of each of the S1 and the S2 is connected to the tail end of a primary winding of the other phase, the other end of each of the S1 is connected to a primary winding controlled by the corresponding high-frequency fully-controlled switch 2, the other end of each of the S2 is connected to a compensation winding controlled by the corresponding high-frequency fully-controlled switch 2 to form a fully-controlled switch, the S1 and the S2 can be automatically switched according to control strategy requirements, and when the S1 is switched, the transformer has a smaller turn ratio to balance sudden rise of secondary side load voltage; the transformer has a larger turn ratio when switching to S2, so as to balance the sudden drop of the secondary side load voltage. The two switches are used for adjusting and changing the duty ratio of the system through PWM to achieve the function of automatically switching the turn ratio of the transformer, the turn ratio of the transformer is adjusted and controlled by controlling the two switches to be conducted, and then the load voltage is stabilized through magnetic field coupling. According to the method, two bidirectional high-frequency switches are reversely connected in series to form a bypass, the two bypasses are respectively connected to two ends of a primary side compensation winding, the on-off of the bypasses are controlled by controlling the duty ratio of a conducting signal through PWM, when the voltage of a power grid is suddenly changed and unstably fluctuated, the stability of the primary side can be maintained, the stable and undistorted voltage on the load side is further ensured, and the harmonic wave treatment function is realized.
As shown in fig. 4, the secondary side winding high frequency converter 3 includes a series converter 5, a low pass filter 4, and a dc bus capacitor 6; the low-pass filter 4 comprises filter capacitors C1, C2 and C3 and filter inductors L1, L2 and L3, and the harmonic waves can be compensated by adding the filter inductors. The series converter 5 is composed of a plurality of IGBT power devices 7, the series converter 5 on the secondary side is a current control converter, the current control converter operates in a current source mode, and the IGBT power devices 7 in the half bridge are controlled to be switched on or switched off according to a magnetic potential balance principle so as to eliminate harmonic current and realize accurate current control. The low-pass filter 4 comprises filter inductors L1, L2 and L3 and filter capacitors C1, C2 and C3, and the three filter capacitors of the low-pass filter 4 are connected to a secondary side winding of the transformer in a star connection mode. The direct current bus capacitor 6 can control the voltage of the direct current bus and is used for realizing the charge and discharge balance of the direct current bus capacitor through the active power regulation of the series converter 7.
Specifically, the series converter 5 uses four half-bridge structures composed of IGBT power devices 7 to form a three-phase control loop and a neutral point, and is combined with a dc bus capacitor 6 and a low-pass filter 4 to complete the control of the harmonic current on the load side. The secondary side a, the secondary side b and the secondary side c are of the same three-phase winding structure, are connected to a filter capacitor and a filter inductor to form a low-pass filter 4, are connected in series to the middle point of a bridge arm of a series current transformer 5, and are connected in parallel to two ends of the series current transformer 5 through a direct current bus capacitor 6. The three-phase head ends of the series converter 5 are respectively: u, v and w, and the tail ends of the U, v and w are connected with a direct current bus capacitor 6 for balancing harmonic components of the power grid. One ends of the filter inductors L1, L2 and L3 are respectively connected with the filter capacitors C1, C2 and C3 in series, and the other ends are respectively connected to the middle points 8a,8b and 8c of the three bridge arms; the head ends of the three filter capacitors are u, v and w respectively, the tail end of the three filter capacitors is a neutral point n led out from the fourth bridge arm, and the direct current bus capacitor 6 is connected to the converter in parallel as a component for realizing energy balance.
In the invention, the primary side winding and the secondary side winding both adopt a layered structure and are wound on the iron core column from outside to inside. The filter inductors in each phase are reversely connected in series after being split into equal turns and are placed on the innermost winding, so that the approximate decoupling of the winding and the filter inductors can be realized, the power consumption of the converter is further reduced, the compensation capacity of the transformer is increased, and the harmonic current is efficiently inhibited.
The number of the primary side winding, the number of the secondary side winding, the number of the high-frequency full-control switch and the number of the current transformers are the same. The number of filter inductors and capacitors in the converter is equal, the converter is connected to secondary side winding balanced voltage by adopting a magnetic integration technology, harmonic suppression is completed in the converter, and stable control and electric energy management on load voltage are completed.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (2)
1. A high-frequency full-control switch turn-ratio-variable current-voltage self-control transformer is characterized by comprising a three-phase transformer body (1), wherein the three-phase transformer body (1) comprises a primary side winding and a secondary side winding, and the primary side winding is connected with a primary side compensation winding in series;
the primary side winding of each phase is connected with a high-frequency full-control switch (2), and the other end of the high-frequency full-control switch (2) is connected with the tail end of the compensation winding of the other phase; the secondary side winding is connected with a load, and the secondary side winding is connected with a secondary side winding high-frequency converter (3) in parallel;
the high-frequency full-control switch (2) in each phase comprises two sub-switches, the head end of one sub-switch is connected to the head end of the primary side winding of the phase, and the head end of the other sub-switch is connected to the tail end of the primary side winding of the phase; the tail ends of the two switches are connected, and the tail ends of the two switches are connected to the tail end of the other phase compensation winding;
each subswitch comprises two IGBT power devices which are connected in series in an opposite direction;
the secondary side winding high-frequency converter (3) comprises a series current transformer (5), a low-pass filter (4) and a direct-current bus capacitor (6); one end of the low-pass filter (4) is connected with the secondary side winding, the other end of the low-pass filter is connected with the series current transformer (5), and the series current transformer (5) is connected with the direct current bus capacitor (6) in parallel;
the low-pass filter (4) comprises three filter inductors and three filter capacitors, each filter inductor is connected with one filter capacitor, the three filter capacitors are connected with a secondary side winding of the transformer in a star connection mode, and the tail ends of the three filter capacitors are connected to a neutral point of the series current transformer (5);
each filter capacitor is connected with a filter inductor in series, and the three filter inductors are connected to a series converter (5);
the series converter (5) comprises four parallel half-bridge structures, and each half-bridge structure comprises two IGBTs connected in series;
the bridge arms of the three half-bridge structures are respectively connected with the three filter inductors, and the bridge arm of one half-bridge structure is a neutral point.
2. A high frequency full controlled switch turn ratio current voltage self controlled transformer as claimed in claim 1, characterized in that, the two sub-switches adjust the duty ratio by PWM.
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| CN202110150009.0A CN112951566B (en) | 2021-02-03 | 2021-02-03 | High-frequency full-control switch turn-ratio-variable current-voltage self-control transformer |
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| CN202110150009.0A CN112951566B (en) | 2021-02-03 | 2021-02-03 | High-frequency full-control switch turn-ratio-variable current-voltage self-control transformer |
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| CN203933483U (en) * | 2014-06-20 | 2014-11-05 | 沈阳工业大学 | Have the novel electric power transformer control system of D.C. magnetic biasing and no-power compensation function concurrently |
| CN110752678A (en) * | 2019-10-28 | 2020-02-04 | 哈尔滨工业大学 | Electric automobile wireless charging transmission system based on primary side auxiliary coil and secondary side resonance state estimation method |
| CN112072669A (en) * | 2020-09-11 | 2020-12-11 | 西安交通大学 | Variable ratio voltage regulation and current compensation autotransformer and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH0722055B2 (en) * | 1988-06-29 | 1995-03-08 | ニシム電子工業株式会社 | Ferro-resonant three-phase constant voltage transformer device |
| US9042129B2 (en) * | 2012-11-15 | 2015-05-26 | General Electric Company | System and method for controlling power in a distribution system |
| EP3179617B1 (en) * | 2015-12-09 | 2018-10-03 | Siemens Aktiengesellschaft | Circuit assembly for the compensation of a dc component in a transformer |
| US10425015B2 (en) * | 2016-05-04 | 2019-09-24 | Siemens Aktiengesellschaft | Converter arrangement having a star point reactor |
| CN207637603U (en) * | 2017-09-26 | 2018-07-20 | 清远电力规划设计院有限公司 | A kind of automatic capacity transfer type distribution transformer |
| DE102018208626A1 (en) * | 2018-05-30 | 2019-12-05 | Siemens Aktiengesellschaft | Magnetically adjustable reactor for reactive power compensation with capacitively connected auxiliary windings |
| CN112103953B (en) * | 2020-09-11 | 2022-04-22 | 西安交通大学 | Stepless voltage regulation distribution transformer based on bidirectional controllable switch and voltage regulation method |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203933483U (en) * | 2014-06-20 | 2014-11-05 | 沈阳工业大学 | Have the novel electric power transformer control system of D.C. magnetic biasing and no-power compensation function concurrently |
| CN110752678A (en) * | 2019-10-28 | 2020-02-04 | 哈尔滨工业大学 | Electric automobile wireless charging transmission system based on primary side auxiliary coil and secondary side resonance state estimation method |
| CN112072669A (en) * | 2020-09-11 | 2020-12-11 | 西安交通大学 | Variable ratio voltage regulation and current compensation autotransformer and method |
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