CN220210263U - Single-tide power electronic transformer capable of carrying out no-load voltage stabilization test - Google Patents
Single-tide power electronic transformer capable of carrying out no-load voltage stabilization test Download PDFInfo
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Abstract
The utility model belongs to a power electronic transformer, and provides a single-tide power electronic transformer capable of carrying out no-load voltage stabilization test, which comprises a resistor R, a direct-current contactor KM, a switch cabinet, an alternating-current starting cabinet, three power cabinets and two direct-current interface cabinets, wherein the switch cabinet, the alternating-current starting cabinet, the three power cabinets and the two direct-current interface cabinets are sequentially connected. The output of cubical switchboard links to each other with the input of exchanging the start-up cabinet, and the input of three power cabinet is connected respectively to the output of exchanging the start-up cabinet, every direct current interface cabinet sets up two direct current interfaces, and the busbar of two direct current interface cabinets is connected to the output of three power cabinet, and four direct current interfaces of direct current interface cabinet link to each other with the busbar, and resistance R and direct current contactor KM establish ties mutually, form steady voltage branch road, and steady voltage branch road is parallelly connected between the busbar.
Description
Technical Field
The utility model belongs to a power electronic transformer, and relates to a single-tide power electronic transformer capable of carrying out no-load voltage stabilization test.
Background
With the continued development of internet data centers (Internet Data Center, IDC), IDC power supply systems are also rising. IDC power supply systems that have undergone three technological updates are becoming more sophisticated. At present, the latest topology is a modularized isolation type input-series-output parallel (Input Series Output Parallel, ISOP) topology, and becomes the latest power electronic transformer topology.
The power electronic transformer not only can carry out power transmission and voltage class conversion, but also can provide a direct current power supply for a direct current load. Compared with the traditional transformer, the power electronic transformer solves many problems faced by the power system, such as the problems of electric energy quality, electromagnetic looped network and the like. Power electronic transformer modules typically include an H-bridge and unidirectional isolated resonant (SRC) topology, i.e., a high frequency isolation module. In order to reduce the influence of the withstand voltage of the semiconductor device on the power electronic transformer, the power electronic transformer module selects a serial-in and parallel-out structure. The power electronic transformer is subjected to no-load test before formal operation, and parameters such as no-load loss, no-load current and no-load voltage of the transformer are tested to evaluate the performance and quality of the transformer.
In the case of no-load tests, problems of overvoltage on the direct current side often occur. As shown in fig. 1, the chinese patent application with application publication number CN112816819a discloses a testing method of a power electronic transformer, which adopts a dc power electronic transformer testing system designed by the applicant to perform testing, wherein the testing contents include an effective rate test, a ripple test, a power step response test, a low-voltage fault ride-through test and a high-voltage fault ride-through test, and the testing system can step to test the electrical performance of the dc power electronic transformer and can also test and evaluate the protection function of the dc power electronic transformer, so as to determine the quality performance of the dc power electronic transformer. However, the testing method is based on a power electronic transformer testing system built by the applicant, and the testing project does not comprise no-load testing, so that the condition and the performance quality of the power electronic transformer in the no-load operation can not be known. As shown in fig. 2, the chinese patent application publication No. CN113219375a discloses a method and a system for testing the operational reliability of a power electronic transformer, specifically, the method includes selecting at least one of a high-voltage ac port 101, a high-voltage dc port 102, a low-voltage dc port 103 and a low-voltage ac port 104 as a power source side, then switching in the power source, switching in a load sequentially at the low-voltage dc port 103 and the low-voltage ac port 104, after a set time for full-load operation, sequentially measuring the state parameters of the power electronic transformer, and finally switching in the load at the low-voltage ac port 104 and the low-voltage dc port 103, after a set time for load operation is added, measuring the state parameters of the power electronic transformer, thereby realizing the detection of the reliability of the power electronic transformer, but the scheme is not applicable to the situation of overvoltage at the dc side. The two schemes can only test partial functions of the power electronic transformer, and still can not solve the problem of overvoltage of the direct current port during no-load operation.
Disclosure of Invention
The utility model provides a single-tide power electronic transformer capable of carrying out no-load voltage stabilization test, which aims to solve the technical problems that the existing power electronic transformer test method only can test partial functions of the power electronic transformer and the direct current port is over-voltage during no-load operation.
In order to achieve the above purpose, the utility model is realized by adopting the following technical scheme:
a single-tide power electronic transformer capable of carrying out no-load voltage stabilization test comprises a resistor R, a direct current contactor KM, a switch cabinet, an alternating current starting cabinet, three power cabinets and two direct current interface cabinets, wherein the switch cabinet, the alternating current starting cabinet, the three power cabinets and the two direct current interface cabinets are sequentially connected;
the input end of the switch cabinet is connected with an alternating voltage source, and the output end of the switch cabinet is connected with the input end of the alternating current starting cabinet;
the output ends of the alternating current starting cabinets are respectively connected with the input ends of the three power cabinets;
each direct current interface cabinet is provided with two direct current interfaces;
the output ends of the three power cabinets are connected with the bus bars of the two direct current interface cabinets, the four direct current interfaces of the direct current interface cabinets are connected with the bus bars, and the direct current interfaces are connected with external loads;
the resistor R and the direct current contactor KM are connected in series to form a voltage stabilizing branch, and the voltage stabilizing branch is connected in parallel between the buses.
Further, the alternating current starting cabinet comprises three alternating current starting branches which are respectively connected with the three phases of the output end of the switch cabinet;
the alternating current starting branch circuit comprises a voltage and current detection module, a circuit breaker, a starting loop, a reactor and a first current transformer which are connected in sequence;
the voltage and current detection module is connected with the output end of the switch cabinet;
the first current transformer is connected with the input end of a power cabinet.
Further, the voltage and current detection module comprises a voltage transformer and a second current transformer which are connected;
the voltage transformer is connected with the output end of the switch cabinet;
the second current transformer is connected with the circuit breaker.
Further, each power cabinet comprises ten power modules, and ten power modules comprise a redundant power module.
Further, each power module adopts a cascade H bridge plus SRC structure; and the ten power modules in each power cabinet adopt an ISOP modularized isolation structure.
Further, the power module comprises a transformer TR, and a high-voltage side module and a low-voltage side module connected to a primary side and a secondary side of the transformer TR;
in each power cabinet, the high-voltage side module closest to the alternating current starting cabinet is connected with a first current transformer, the adjacent high-voltage side modules are connected in series, and the high-voltage side module closest to the direct current interface cabinet is connected with a busbar of the direct current interface cabinet;
in each power cabinet, adjacent low-voltage side modules are connected in parallel, and the low-voltage side module closest to the direct-current interface cabinet is connected with a busbar of the direct-current interface cabinet.
Further, the resistance value of the resistor R is 33.3Ω.
Further, the alternating voltage source is 10kv alternating current.
Further, the output voltage of the bus bar is 275v.
Compared with the prior art, the utility model has the following beneficial effects:
1. the utility model provides a single-tide power electronic transformer capable of carrying out no-load voltage stabilization test, which is characterized in that input voltage is measured and filtered by an alternating current starting cabinet and then is converted into direct current voltage by a power cabinet, and finally the direct current voltage is output by a bus of a direct current interface cabinet, so that the voltage is changed from high-voltage alternating current to low-voltage direct current, a storage battery is charged or a load such as a column head cabinet is provided with a direct current power supply, a large resistor and a direct current contactor are connected in parallel with the bus of the direct current interface cabinet, a loop is provided for the power electronic transformer, redundant energy can be consumed, the direct current side voltage is stabilized at about 275v, the difficulty of a control algorithm for stabilizing the direct current side voltage is reduced, and the cost of devices is reduced. Meanwhile, the utility model has low realization cost and high reliability, and has universality for no-load voltage stabilization test of the single-tide power electronic transformer.
2. The reliability of the power electronic transformer is greatly dependent on the stability of the output voltage of the direct-current interface cabinet, when no-load test is actually carried out, the output voltage of the direct-current interface cabinet can surge to 400v, the power electronic transformer is damaged to a certain extent, the direct-current side voltage can be effectively stabilized through the connection of a large resistor and a direct-current contactor, and a safe charging environment is provided for loads such as a storage battery, a train head cabinet and the like.
3. The alternating current starting cabinet and the power cabinet have simple structures, and can realize the function of current and voltage real-time monitoring, thereby further reducing the cost and the realization difficulty of the power electronic transformer.
Drawings
For a clearer description of the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a diagram of a prior art DC power electronic transformer test system;
fig. 2 is a schematic diagram of a connection relationship of a conventional power electronic transformer in the background art.
Wherein: 101-high voltage ac port, 102-high voltage dc port, 103-low voltage dc port, 104-low voltage ac port.
Fig. 3 is a schematic diagram illustrating connection between the resistor R and the dc contactor KM according to the first embodiment of the present utility model;
FIG. 4 is a schematic diagram of a switchgear and an AC starting cabinet in a third embodiment of the utility model;
fig. 5 is a schematic diagram of a power cabinet in a third embodiment of the utility model.
The system comprises a 1-switch cabinet, a 2-alternating current starting cabinet, a 3-power cabinet, a 4-direct current interface cabinet, a 5-power module, a 6-high-voltage side module and a 7-low-voltage side module.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. The components of the embodiments of the present utility model 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 utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the embodiments of the present utility model, it should be noted that, if the terms "upper," "lower," "horizontal," "inner," and the like indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, or the azimuth or the positional relationship in which the inventive product is conventionally put in use, it is merely for convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the apparatus or element to be referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
Furthermore, the term "horizontal" if present does not mean that the component is required to be absolutely horizontal, but may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the embodiments of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" should be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
The utility model is described in further detail below with reference to the attached drawing figures:
the utility model provides a single-tide power electronic transformer capable of carrying out no-load voltage stabilization test, which can be used for carrying out no-load test of the power electronic transformer to achieve the voltage stabilization effect.
Example 1
A single-tide power electronic transformer capable of carrying out no-load voltage stabilization test comprises a resistor R, a direct-current contactor KM, a switch cabinet 1, an alternating-current starting cabinet 2, three power cabinets 3 and two direct-current interface cabinets 4.
The input end of the switch cabinet 1 is connected with an alternating current voltage source, 10kv alternating current voltage is connected through the alternating current voltage source during no-load test, the output end of the switch cabinet 1 is connected with the input end of the alternating current starting cabinet 2, 10kv alternating current voltage is connected with the alternating current starting cabinet 2, the output ends of the alternating current starting cabinet 2 are respectively connected with the input ends of three power cabinets 3, and the alternating current starting cabinet is converted into direct current voltage through the power cabinets 3. The output end of the three power cabinets 3 is connected with the bus bars of the two direct current interface cabinets 4, the four direct current interfaces of the direct current interface cabinets 4 are connected with the bus bars, and the direct current interfaces are connected with external loads such as a column head cabinet, a battery and the like to output voltage to the external loads. For example, as shown in fig. 3, in practical application, the dc interface is connected with a current sensor, a voltage sensor, a vacuum sensor, a voltage sensor and an insulation detector, and then divided into twelve paths, six paths are respectively connected with a fuse in series and then with a battery, and the other six paths are respectively connected with a dc breaker in series and then with a first cabinet, and the first cabinet is a server. According to theoretical calculation, the output end of the direct current interface cabinet 4 should output 275v voltage, however, in practice, the input voltage of the direct current interface cabinet can reach 400v, and the direct current power supply of 275v cannot be charged for the storage battery or provided for the column head cabinet. As shown in fig. 3, the resistor R and the dc contactor KM are connected in series to form a voltage stabilizing branch, the voltage stabilizing branch is connected in parallel between the bus bars, the resistance value of the resistor R is set to 33.3 Ω, the resistor R and the dc contactor KM serving as the voltage stabilizing branch are connected between the bus bars of the dc interface cabinet 4, and the energy charged in the front stage can be released on the resistor R in the closed loop, so that the output voltage is stabilized at about 275v.
In production practice, the technical scheme of the first embodiment is adopted for practical verification, so that the stability of no-load test of the power electronic transformer can be effectively controlled, meanwhile, the reliability of no-load test results can be ensured, and the test scheme of the first embodiment is proved to be excellent in practicality.
Example two
The difference between the second embodiment and the first embodiment is that, according to the difference of the structures of the ac starting cabinet 2, the power cabinet 3 and the dc interface cabinet 4, the power electronic transformer can output different voltages from the first embodiment, so as to meet the voltage requirements of different external loads, and the existing power simulation software is adopted to redetermine the resistance value of the resistor R, so that different voltage stabilizing requirements can be met.
In different embodiments of the present utility model, the resistance value of the resistor R may be adjusted according to the voltage stabilizing requirement, and the specific structures of the ac starting cabinet 2, the power cabinet 3 and the dc interface cabinet 4.
Example III
As shown in fig. 4, the ac starting cabinet 2 includes three ac starting branches respectively connected with three phases of the output end of the switch cabinet 1, the ac starting branches include a voltage transformer, a second current transformer, a circuit breaker, a starting circuit, a reactor and a first current transformer which are sequentially connected, the voltage transformers in the three ac starting branches are respectively a voltage transformer PT1, a voltage transformer PT2 and a voltage transformer PT3, the second current transformers are respectively a current transformer CT1, a current transformer CT2 and a current transformer CT3, the circuit breaker is specifically three circuit breakers QS1, the starting circuit includes a dc contactor KM1 and a resistor R1, the reactor is respectively a reactor L1, a reactor L2 and a reactor L3, the first current transformer is respectively a current transformer CT4, a current transformer CT5 and a current transformer CT6, the voltage transformers are respectively connected with the output end of the switch cabinet 1, and the first current transformer is connected with the input end of one power cabinet. The main functions of the alternating current starting cabinet 2 are a starting circuit, voltage and current measurement and filtering, wherein a voltage transformer and a second current transformer form a voltage and current detection module together, and the voltage and current flowing through the voltage and current detection module are measured.
As shown in fig. 5, three power cabinets 3 respectively correspond to three phases, each power cabinet 3 includes ten power modules 5, each power module 5 includes a redundant power module, each power module 5 adopts a cascaded H-bridge plus SRC structure, and ten power modules 3 in each power cabinet 3 adopt an ISOP modularized isolation structure. Specifically, the power module 5 includes a transformer TR, and a high-voltage side module 6 and a low-voltage side module 7 connected to a primary side and a secondary side of the transformer TR. In each power cabinet 3, the high-voltage side module 6 closest to the ac starting cabinet 2 is connected to the first current transformer, the adjacent high-voltage side modules 6 are connected in series with each other, and the high-voltage side module 6 closest to the dc interface cabinet 4 is connected to the busbar of the dc interface cabinet 4. In each power cabinet 3, adjacent low-voltage side modules 7 are connected in parallel with each other, and the low-voltage side module 7 closest to the dc interface cabinet 4 is connected to the busbar of the dc interface cabinet 4. In the three power cabinets 3, 30 power modules 5 are provided in total, and the power transmission can be performed by converting an ac voltage of 10kv into a dc voltage of 275v.
When the direct current interface cabinet 4 runs in a belt mode, the current output by the power cabinet 3 is transmitted to the direct current interface cabinet 4, and then the current is output by the direct current interface cabinet 4 for load use. The specific structure of the dc interface cabinet 4 may be an existing structure, and will not be described here. The resistor R and the direct current contactor KM are connected in parallel between the buses.
The third embodiment is based on the principle that 10kv ac sequentially enters the switch cabinet 1 and the ac starting cabinet 2, the voltage transformer and the second current transformer in the ac starting cabinet 2 are used for measuring the flowing voltage and current in real time, whether the value of the voltage and the current meet the requirement can be observed at any time, the electric energy is transmitted to the power cabinet 3 through the filtering of the reactor, the ac voltage is converted into the dc voltage in the power cabinet 3, the energy is transmitted, and finally the energy is input into the bus and is output to the dc interface through the bus. A resistor R and a direct current contactor KM are connected to a busbar of the direct current interface cabinet 4, so that energy charged by a front stage can be released, and the voltage of the direct current interface cabinet is stabilized at 275v.
Example IV
The fourth embodiment differs from the third embodiment in that the number of power modules 5, the number of redundant power modules, the structure of the power modules, and the connection manner of the power modules in the power cabinet 3 are all different, and can be adjusted according to the specific type of the power electronic transformer, so as to adapt to different use requirements, for example, different required voltages of the load. However, the required voltage of the load is different, and only one of the reasons why the power cabinet 3 may be adjusted is that in other embodiments of the present utility model, the power cabinet 3 may be adjusted due to the different requirements.
The principle of the utility model is as follows: in the embodiment of the utility model, the input voltage is 10kv, and the required output voltage is 275v. The 10kv voltage sequentially passes through the switch cabinet 1, the alternating current starting cabinet 2 and the power cabinet 3, and finally outputs power at the direct current interface cabinet 4, however, experiments show that the output voltage of the direct current side of the unidirectional power electronic transformer is unstable and rises to 400v when the unidirectional power electronic transformer runs in no-load. Aiming at the condition of no-load operation, the utility model can solve the problem of unstable voltage by connecting a resistor R with a resistance value of 33.3 omega and a direct current contactor KM in parallel between the buses of the direct current interface cabinet 4, and after the switch cabinet 1 is connected with 10kv voltage, the direct current contactor KM is switched on to form a closed loop, energy is released after being charged from the switch cabinet 1 through resistor consumption, and the output voltage at the direct current side is stabilized to about 275v. If the equipment is in a belt running mode, the equipment can be in a belt running mode after the switching-on voltage of the direct current contactor KM is stabilized at 275v, after the current of the busbar appears, the resistor is cut off by the direct current contactor KM, the voltage of a direct current output port is 275v, and the power electronic transformer can be in the belt running mode through tests.
As a supplementary explanation of the utility model:
a power electronic transformer: the EPT is a transformer based on a semiconductor device, can convert alternating current input voltage into direct current output voltage, and can realize the functions of power regulation, electric energy conversion and the like. The power electronic transformer is widely applied to the fields of power systems, industrial automation, transportation, new energy and the like.
The above is only a preferred embodiment of the present utility model, and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.
Claims (9)
1. The utility model provides a single trend power electronic transformer that can carry out no-load steady voltage test which characterized in that: the high-voltage power supply comprises a resistor R, a direct-current contactor KM, a switch cabinet (1), an alternating-current starting cabinet (2), three power cabinets (3) and two direct-current interface cabinets (4) which are connected in sequence;
the input end of the switch cabinet (1) is connected with an alternating-current voltage source, and the output end of the switch cabinet is connected with the input end of the alternating-current starting cabinet (2);
the output ends of the alternating current starting cabinets (2) are respectively connected with the input ends of the three power cabinets (3);
each direct current interface cabinet (4) is provided with two direct current interfaces;
the output ends of the three power cabinets (3) are connected with the buses of the two direct current interface cabinets (4), the four direct current interfaces of the direct current interface cabinets (4) are connected with the buses, and the direct current interfaces are connected with external loads;
the resistor R and the direct current contactor KM are connected in series to form a voltage stabilizing branch, and the voltage stabilizing branch is connected in parallel between the buses.
2. A single-load power electronic transformer capable of no-load voltage regulation testing according to claim 1, characterized in that: the alternating current starting cabinet (2) comprises three alternating current starting branches which are respectively connected with the three phases of the output end of the switch cabinet (1);
the alternating current starting branch circuit comprises a voltage and current detection module, a circuit breaker, a starting loop, a reactor and a first current transformer which are connected in sequence;
the voltage and current detection module is connected with the output end of the switch cabinet;
the first current transformer is connected with the input end of a power cabinet.
3. A single-load power electronic transformer capable of no-load voltage regulation testing according to claim 2, characterized in that: the voltage and current detection module comprises a voltage transformer and a second current transformer which are connected;
the voltage transformer is connected with the output end of the switch cabinet (1);
the second current transformer is connected with the circuit breaker.
4. A single-load power electronic transformer capable of no-load voltage regulation testing according to claim 3, characterized in that: each power cabinet (3) comprises ten power modules (5), and ten power modules (5) comprise a redundant power module.
5. A single-load power electronic transformer capable of no-load voltage regulation testing as recited in claim 4, wherein: each power module (5) adopts a cascade H bridge and SRC structure; and modular isolation structures of ISOP are adopted among ten power modules (5) in each power cabinet (3).
6. A single-load power electronic transformer capable of no-load voltage regulation testing as recited in claim 4, wherein: the power module (5) comprises a transformer TR, and a high-voltage side module (6) and a low-voltage side module (7) which are connected to the primary side and the secondary side of the transformer TR;
in each power cabinet (3), the high-voltage side module (6) closest to the alternating current starting cabinet (2) is connected with a first current transformer, the adjacent high-voltage side modules (6) are connected in series, and the high-voltage side module (6) closest to the direct current interface cabinet (4) is connected with a busbar of the direct current interface cabinet (4);
in each power cabinet (3), adjacent low-voltage side modules (7) are connected in parallel, and the low-voltage side module (7) closest to the direct-current interface cabinet (4) is connected with a busbar of the direct-current interface cabinet (4).
7. A single-load power electronic transformer capable of performing no-load voltage regulation testing according to any one of claims 1 to 6, characterized in that: the resistance value of the resistor R is 33.3 omega.
8. A single-load power electronic transformer capable of no-load voltage regulation testing as recited in claim 7, wherein: the alternating voltage source is 10kv alternating current.
9. A single-load power electronic transformer capable of no-load voltage regulation testing according to claim 8, wherein: the output voltage of the bus is 275v.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321492238.1U CN220210263U (en) | 2023-06-12 | 2023-06-12 | Single-tide power electronic transformer capable of carrying out no-load voltage stabilization test |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321492238.1U CN220210263U (en) | 2023-06-12 | 2023-06-12 | Single-tide power electronic transformer capable of carrying out no-load voltage stabilization test |
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| CN220210263U true CN220210263U (en) | 2023-12-19 |
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| CN202321492238.1U Active CN220210263U (en) | 2023-06-12 | 2023-06-12 | Single-tide power electronic transformer capable of carrying out no-load voltage stabilization test |
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| CN (1) | CN220210263U (en) |
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