CN110868065A - Direct current transformer - Google Patents
Direct current transformer Download PDFInfo
- Publication number
- CN110868065A CN110868065A CN201911158636.8A CN201911158636A CN110868065A CN 110868065 A CN110868065 A CN 110868065A CN 201911158636 A CN201911158636 A CN 201911158636A CN 110868065 A CN110868065 A CN 110868065A
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- Prior art keywords
- inductor
- direct current
- capacitor
- module
- current transformer
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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
-
- 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
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
Abstract
The invention relates to a direct current transformer, and belongs to the technical field of direct current distribution networks. The direct-current transformer comprises at least two DC/DC modules, the output end of each DC/DC module is connected with a distributed inductance circuit, and the distributed inductance circuit comprises a positive pole inductance with an iron core and is used for connecting the positive pole of an output end line of the DC/DC module; the negative pole inductor with the iron core is used for connecting the negative pole of the output end circuit of the DC/DC module; a capacitor module is arranged between the positive inductor and the negative inductor of the belt iron core in series; and the capacitor modules of the distributed inductance circuits of the DC/DC modules are connected in series to form the output end of the direct current transformer. The positive inductor, the negative inductor and the capacitor module in the direct current transformer are all small in size, namely the size and the capacity of the inductor and the capacitor are correspondingly reduced, the integration degree is high, the size of the direct current transformer is correspondingly reduced, and meanwhile, the production cost of the direct current transformer can be reduced because the requirements on the production process of the inductor and the capacitor with small size are not high.
Description
Technical Field
The invention relates to a direct current transformer, and belongs to the technical field of direct current distribution networks.
Background
With the increase of direct current distribution network engineering and the rapid development of the technical field of direct current distribution networks, direct current equipment (such as a direct current transformer) is more widely applied to actual direct current transmission engineering, the application has the characteristics of high voltage, large current and large capacity, the number of modules of the required direct current distribution equipment is increased, the size of the equipment is increased, and how to better access a distributed power supply and a direct current load becomes a more severe problem, so that direct current equipment with smaller size and higher integration level is urgently needed to improve the safety and the operating efficiency of a system.
In the prior art, a DC transformer is connected with inductors L1 and L2 with iron cores in a unified manner after series connection of DC/DC modules, and outputs the inductors to a capacitor C. As shown in fig. 1, after the bus is connected in series through modules 1 to n (i.e., DC/DC modules), the positive and negative poles are output to the capacitor C through the large inductors L1 and L2 with iron cores. The adoption of the circuit mode requires that the inductors L1 and L2 have larger volumes, the requirements on insulation and grounding levels are higher, and the capacitor C has larger capacity and volume, so that the requirements on the production process of the inductors and the capacitors are higher, thereby leading to the large volume and higher cost of the direct current transformer.
Disclosure of Invention
The invention aims to provide a direct current transformer which is used for solving the problems of large size and high cost of the direct current transformer in the prior art.
The direct current transformer adopts the following technical scheme:
including at least two DC/DC modules, the output of every DC/DC module all is connected with distributed inductance circuit, and distributed inductance circuit includes:
the positive inductor with the iron core is used for connecting the positive pole of the output end circuit of the DC/DC module; the negative pole inductor with the iron core is used for connecting the negative pole of the output end circuit of the DC/DC module; a capacitor module is arranged between the positive inductor and the negative inductor of the belt iron core in series;
and the capacitor modules of the distributed inductance circuits of the DC/DC modules are connected in series to form the output end of the direct current transformer.
The beneficial effects of the above technical scheme are:
the direct current transformer is characterized in that the output end of each DC/DC module is provided with a distributed inductance circuit, each distributed inductance circuit comprises a positive inductance with an iron core, a negative inductance and a capacitance module connected in series between the positive inductance and the negative inductance, and the capacitance modules are connected in series to serve as the output end of the direct current transformer. Compared with the inductor and the capacitor with large volumes in the existing direct current transformer, the positive inductor, the negative inductor and the capacitor module in the direct current transformer are all small in volume, namely the size and the capacity of the inductor and the capacitor are correspondingly reduced, the integration degree is higher, the volume of the direct current transformer is correspondingly reduced, and meanwhile, the production process requirements of the inductor and the capacitor with small volumes are not high, so that the production cost is low, and the production cost of the direct current transformer can be reduced.
In order to eliminate the floating potential, one implementation scheme is as follows: the iron core of the negative inductor is grounded, and the iron core of the positive inductor is grounded.
In order to eliminate the floating potential, another implementation scheme is as follows: the capacitor module comprises an anode capacitor and a cathode capacitor, the anode capacitor and the cathode capacitor are connected in series, the series point of the anode capacitor and the cathode capacitor is connected with the iron core of the anode inductor through a first resistor, and the series point of the anode capacitor and the cathode capacitor is connected with the iron core of the cathode inductor through a second resistor.
The first resistor and the second resistor are led out from the iron core of the positive electrode inductor and the iron core of the negative electrode inductor and are connected with a capacitor neutral point (namely a series point of the positive electrode capacitor and the negative electrode capacitor), so that the iron core of the inductor is electrically connected with the output side, the suspension potential of the inductor iron core of the direct current transformer is effectively reduced, the partial discharge phenomenon of the direct current transformer is avoided, and the safety and the reliability of the direct current transformer are improved. And the first resistor and the second resistor are high-value resistors, high-frequency circulation generated between the DC/DC module and the inductor is avoided by the high-value resistors, and meanwhile, the insulation voltage-resistant grade between the inductor winding and the iron core is increased, and the phenomenon of breakdown of the inductor is avoided.
Further, the resistance values of the first resistor and the second resistor are the same; the capacitance values of the anode capacitor and the cathode capacitor are the same, so that the effect of eliminating the suspension potential is ensured.
In order to increase the integration of the dc transformer, further, the first resistor is integrated inside the iron core of the positive inductor, and the second resistor is integrated inside the iron core of the negative inductor.
Drawings
FIG. 1 is a schematic diagram of a prior art DC transformer;
fig. 2 is a schematic diagram of a dc transformer in embodiment 1 of the present invention;
FIG. 3 is a schematic diagram of a DC transformer in embodiment 2 of the present invention;
fig. 4 is a schematic diagram of a dc transformer in embodiment 3 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 detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The features and properties of the present invention are described in further detail below with reference to examples.
Example 1:
as shown in fig. 2, the DC transformer includes at least n DC/DC modules, which are respectively module 1, …, module k, …, and module n, where an output end of each DC/DC module is connected to a distributed inductor circuit with the same structure, and taking the distributed inductor circuit of module 1 as an example, the distributed inductor circuit includes: a positive inductance with iron core L1, a negative inductance with iron core L2, and a capacitor module (i.e., capacitor C1).
The positive pole inductor L1 with the iron core is used for connecting the positive pole of the output end circuit of the module 1, and the negative pole inductor L2 with the iron core is used for connecting the negative pole of the output end circuit of the module 1; a capacitor module (capacitor C1) is provided in series between the positive electrode inductor L1 and the negative electrode inductor L2.
The distributed inductance circuits of the other DC/DC modules are similar to the distributed inductance circuit described above, and the capacitance modules of the distributed inductance circuits of each DC/DC module are connected in series, i.e., C1, …, Ck, …, Cn, to form the output of the DC transformer.
In the direct current transformer of the embodiment, the distributed inductance circuit is arranged at the output end of each DC/DC module, each distributed inductance circuit comprises the positive inductance and the negative inductance of the iron core, and the capacitance modules connected in series between the positive inductance and the negative inductance, and the capacitance modules are connected in series to serve as the output end of the direct current transformer.
Compared with the inductor and the capacitor with large volumes in the existing direct current transformer, the positive inductor, the negative inductor and the capacitor module in the direct current transformer are all small in volume, namely the size and the capacity of the inductor and the capacitor are correspondingly reduced, the integration degree is higher, the volume of the direct current transformer is correspondingly reduced, and meanwhile, the production process requirements of the inductor and the capacitor with small volumes are not high, so that the production cost is low, and the production cost of the direct current transformer can be reduced.
In this embodiment, the positive/negative inductance of the strip core means that the positive/negative inductance is used as a winding for winding on the corresponding core.
Example 2:
when the medium-voltage and high-voltage direct-current distribution network and the direct-current transformer in the embodiment 1 adopt the topology of modular cascade, because the iron core in the direct-current transformer and the main circuit lack electrical connection, a suspension potential can be generated, when the electric field intensity is uneven, the suspension potential can generate a certain electric field, and then a discharge phenomenon can be generated, and an insulating layer can be burned out seriously to influence the stable operation of equipment. Therefore, based on the dc transformer in embodiment 1, this embodiment provides a dc transformer, as shown in fig. 3, in each distributed inductance circuit, the iron core of the negative inductor is grounded, and the iron core of the positive inductor is grounded, so as to effectively reduce the floating potential of the inductance iron core of the dc transformer, avoid the local discharge phenomenon of the dc transformer, and improve the safety and reliability of the dc transformer.
Example 3:
in order to solve the problems of large size, high cost, and generation of floating potential of the DC transformer, as shown in fig. 4, the present embodiment provides a DC transformer, which includes at least n DC/DC modules, which are respectively a module 1, …, a module k, …, and a module n, wherein an output end of each DC/DC module is connected to a distributed inductor circuit having the same structure, and taking the distributed inductor circuit of the module 1 as an example, the distributed inductor circuit includes:
the inductor comprises a positive electrode inductor L1 with an iron core, a negative electrode inductor L2 with an iron core, and a capacitor module, wherein the capacitor module comprises a positive electrode capacitor C1 and a negative electrode capacitor C2, the positive electrode capacitor C1 and the negative electrode capacitor C2 are connected in series, and the series point (namely a capacitor neutral point) of the positive electrode capacitor C1 and the negative electrode capacitor C2 is connected with the iron core of the positive electrode inductor L1 through a first resistor R1; meanwhile, the series point of the positive electrode capacitor C1 and the negative electrode capacitor C2 is connected with the iron core of the negative electrode inductor L2 through a second resistor R2, and the first resistor R1 and the second resistor R2 are both high-resistance resistors.
The positive pole inductor L1 with the iron core is used for connecting the positive pole of the output end circuit of the module 1, and the negative pole inductor L2 with the iron core is used for connecting the negative pole of the output end circuit of the module 1; a capacitor module is provided in series between the positive inductor L1 and the negative inductor L2 with iron cores.
The distributed inductance circuit of other DC/DC modules is similar to the distributed inductance circuit described above, for example, the distributed inductance circuit in module k includes a positive inductance Lk, a negative inductance Lk +1, a positive capacitance Ck and a negative capacitance Ck + 1; the distributed inductance circuit of the module n comprises a positive electrode inductance Ln, a negative electrode inductance Ln +1, a positive electrode capacitance Cn and a negative electrode capacitance Cn + 1. The capacitor modules of the distributed inductor circuits of the DC/DC modules are connected in series, i.e., C1, C2, …, Ck +1, …, Cn +1 are connected in series, to form the output terminal of the DC transformer.
In each distributed inductance circuit, the resistance values of the first resistor R1 and the second resistor R2 are the same (the series point of the first resistor and the second resistor forms a neutral point); the positive electrode capacitance and the negative electrode capacitance have the same capacitance values, for example, the capacitance values of C1 and C2 are the same, and the capacitance values of Ck and Ck +1 are the same. In another embodiment, the capacitance values of the positive electrode capacitance and the negative electrode capacitance may not be exactly the same, but the effect of eliminating the floating potential in this embodiment is not as good as that in the case where the capacitance values are the same. Similarly, the resistances of the first resistor and the second resistor may not be strictly the same, but the effect of eliminating the floating potential is better than that of eliminating the floating potential when the resistances are not the same.
In this embodiment, in order to further integrate the dc transformer, it is preferable that the first resistor R1 be integrated in the core of the positive inductor, and the second resistor R2 be integrated in the core of the negative inductor.
The direct current transformer of the invention has the advantages that the sizes and capacities of the inductor and the capacitor with the iron core are correspondingly reduced, the integration degree is higher, the volume of the direct current transformer is correspondingly reduced, and the problems of overlarge volume of the inductor and overhigh capacity and voltage of the capacitor connected with a DC/DC module of the traditional direct current transformer are solved. And the first/second resistor is led out from the iron core of the positive/negative electrode inductor and is connected with a capacitor neutral point (namely the series point of the positive electrode capacitor and the negative electrode capacitor), so that the iron core of the inductor is electrically connected with the output side, the suspension potential of the inductor iron core of the direct current transformer is effectively reduced, the partial discharge phenomenon of the direct current transformer is avoided, and the safety and the reliability of the direct current transformer are improved.
In addition, because the first resistor and the second resistor in the embodiment are both high-resistance resistors, high-frequency circulation generated between the DC/DC module and the inductor is avoided, and meanwhile, the insulation voltage-resistant grade between the inductor winding and the iron core is increased, and the phenomenon of breakdown of the inductor is avoided.
Claims (5)
1. A DC transformer comprising at least two DC/DC modules, wherein each DC/DC module has an output connected to a distributed inductive circuit, the distributed inductive circuit comprising:
the positive inductor with the iron core is used for connecting the positive pole of the output end circuit of the DC/DC module; the negative pole inductor with the iron core is used for connecting the negative pole of the output end circuit of the DC/DC module; a capacitor module is arranged between the positive inductor and the negative inductor of the belt iron core in series;
and the capacitor modules of the distributed inductance circuits of the DC/DC modules are connected in series to form the output end of the direct current transformer.
2. The direct-current transformer according to claim 1, wherein the capacitance module comprises a positive electrode capacitance and a negative electrode capacitance, the positive electrode capacitance and the negative electrode capacitance are connected in series, a series point of the positive electrode capacitance and the negative electrode capacitance is connected with the iron core of the positive electrode inductance through a first resistance, and a series point of the positive electrode capacitance and the negative electrode capacitance is connected with the iron core of the negative electrode inductance through a second resistance.
3. The direct current transformer according to claim 2, wherein the first resistor and the second resistor have the same resistance; the positive electrode capacitance and the negative electrode capacitance have the same capacitance value.
4. The dc transformer of claim 2, wherein the first resistor is integrated inside a core of a positive inductor and the second resistor is integrated inside a core of a negative inductor.
5. The dc transformer of claim 1, wherein the core of the negative inductor is grounded and the core of the positive inductor is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911158636.8A CN110868065A (en) | 2019-11-22 | 2019-11-22 | Direct current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911158636.8A CN110868065A (en) | 2019-11-22 | 2019-11-22 | Direct current transformer |
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| Publication Number | Publication Date |
|---|---|
| CN110868065A true CN110868065A (en) | 2020-03-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911158636.8A Pending CN110868065A (en) | 2019-11-22 | 2019-11-22 | Direct current transformer |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5929692A (en) * | 1997-07-11 | 1999-07-27 | Computer Products Inc. | Ripple cancellation circuit with fast load response for switch mode voltage regulators with synchronous rectification |
| CN102497127A (en) * | 2011-11-22 | 2012-06-13 | 广东工业大学 | Energy storage charging power supply device for connecting electric automobile with intelligent power grid |
| CN106100317A (en) * | 2016-06-30 | 2016-11-09 | 上海交通大学 | A kind of ISIPOSOP pattern massing DC DC changer and composing method thereof and output voltage control method |
-
2019
- 2019-11-22 CN CN201911158636.8A patent/CN110868065A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5929692A (en) * | 1997-07-11 | 1999-07-27 | Computer Products Inc. | Ripple cancellation circuit with fast load response for switch mode voltage regulators with synchronous rectification |
| CN102497127A (en) * | 2011-11-22 | 2012-06-13 | 广东工业大学 | Energy storage charging power supply device for connecting electric automobile with intelligent power grid |
| CN106100317A (en) * | 2016-06-30 | 2016-11-09 | 上海交通大学 | A kind of ISIPOSOP pattern massing DC DC changer and composing method thereof and output voltage control method |
Non-Patent Citations (1)
| Title |
|---|
| 陈化钢: "《电力设备事故处理手册（ 异常运行 故障诊断 事故处理）》", 30 April 2004 * |
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Application publication date: 20200306 |