Y-Δ Phase-Shifting Transformer with 14-Multiple-Winding Output and Power Supply and Distribution System

Abstract

Y-Δ phase-shifting transformer with 14-times multiple winding output and power supply and distribution system. The high-voltage side winding is connected in Y-shape, and the low-voltage side winding includes at least one sub-winding. Each sub-winding includes 14 three-phase low-voltage phase-shifting windings connected in extended Δ. Each phase coil of the low-voltage phase-shifting winding is composed of a basic coil D1 and an extended coil Y1. The basic coil D1 is used to construct the triangular side of the phase-shifting winding, and the extended coil Y1 is used to construct the triangular extended side of the phase-shifting winding. It is characterized in that the theoretical phase angle distribution of each low-voltage phase-shifting winding of each sub-winding and the turn combination configuration of the basic coil D1 and the extended coil Y1 in each phase coil of windings with different phases are arranged according to the optimized combination data, constructing a Y-Δ phase-shifting transformer with 14-times multiple winding output, which can obtain relatively optimized harmonic elimination effect and relatively balanced output waveform, achieving harmonic elimination quality and standards not only with relative advantages but also with predictability and stability.

Description

Technical Field

[0001] The present invention relates to a phase-shifting transformer and a power supply and distribution system, and particularly to a Y-Δ phase-shifting transformer with a 14-fold winding output containing an extended coil and a power supply and distribution system for a data center. Background Art

[0002] With the development of the communication industry and the cloud computing industry, the amount of data has been continuously rising. The construction of data centers has great potential, and higher requirements are placed on the product performance and economic cost of the transformers applied in data centers. The electrical load characteristics of the data center include a large number of DC electrical loads, such as server hosts containing UPS modules.

[0003] In the DC power distribution cabinet of the data center, a large number of IGBT rectifier modules are configured to rectify the alternating current input by the low-voltage phase-shifting winding of the transformer into direct current. The phase of the low-voltage phase-shifting winding is preferably adapted to the triggering phase of the IGBT rectifier circuit. The phase-shifted output of the multi-winding configuration can greatly eliminate harmonics (commonly known as harmonic elimination). For the above purpose, the patent application No. 201520526746.6, named "Oil-immersed 54-pulse frequency conversion transformer for high-power high-voltage frequency conversion device", discloses that its high voltage uses a three-phase primary winding with a Y connection, and the low voltage uses a multi-phase output winding with a wye-delta connection. It is characterized in that the low-voltage winding is divided into three large groups, and each large group includes 9 low-voltage phase-shifting windings, and their phase-shifting angles are +26.67°, +20°, +13.33°, +6.67°, 0°, -6.67°, -13.33°, -20°, -26.67° respectively, and the phase angle difference between each low-voltage phase-shifting winding is 6.67°; each phase is composed of several power units connected in series, and the adjacent three-phase low-voltage outputs are mutually differ by 6.67°. The 9 low-voltage phase-shifting windings are triggered by thyristor IGBTs controlled by three-phase different timing pulses to obtain 27 positive and negative pulses each; the high-voltage winding is also divided into three large groups, and both the high-voltage winding and the low-voltage winding adopt disk coil structures; each phase of the secondary side outputs 27 windings, and there are 81 windings in total for the three phases. The low-voltage bushings are led out from the side wall of the oil tank, with a total of 81 bushings. Technical solutions using a multi-winding extended coil Y1 for harmonic elimination, including the above-mentioned prior art, have the following problems in actual manufacturing:

[0004] 1. Since the voltage levels of the high-voltage power systems of each data center may be different, if the transformer is redesigned to adapt to such different input voltages, the workload will obviously increase greatly, the delivery period will be delayed, and the manufacturing cost will increase;

[0005] 2. Redesigning the transformer to adapt to different voltage levels and the specified requirements of users results in different phase-shifting angles of the secondary side, different filtering effects, and poor product consistency;

[0006] 3. To redesign the transformer to adapt to different voltage levels, the inconsistent number of turns results in a slow development cycle of the new product project, affecting the actual commissioning of the product. Summary of the Invention

[0007] For a low-voltage multi-winding phase-shifting transformer, it is not only to adapt to a large number of IGBT rectifier loads, but also to reduce the harmonic interference to the power system. However, how to design a Y-Δ phase-shifting transformer with a 14-multiple winding output to make it have universality in design and manufacturing, or to have relatively optimized harmonic elimination performance when adapting to high-voltage systems of various different voltage levels, is the problem that the present invention attempts to solve. Based on this, the present invention proposes a Y-Δ phase-shifting transformer with a 14-multiple winding output, the high-voltage end winding is connected in a Y shape, and the low-voltage end winding includes at least one group winding, and each of the group windings includes 14 three-phase low-voltage phase-shifting windings connected in an extended Δ connection; each phase coil of the low-voltage phase-shifting winding is composed of a basic coil D1 and an extended coil Y1, the basic coil D1 is used to construct the triangular side of the phase-shifting winding, and the extended coil Y1 is used to construct the triangular extended side of the phase-shifting winding; it is characterized in that the theoretical phase angle distribution of each low-voltage phase-shifting winding of each group winding, and the turn number combination configuration of the basic coil D1 and the extended coil Y1 in each phase coil of different phase windings are arranged according to the data listed in the following table;

[0008]

[0009] Among them, when the number of turns of the extended coil Y1 is zero, the low-voltage phase-shifting winding is entirely composed of the basic coil D1 to form a winding connected in a Δ connection, and when the number of turns of the basic coil D1 is zero, the low-voltage phase-shifting winding is entirely composed of the extended coil Y1 to form a winding connected in a Y connection; when the phase angle A1 is positive, it means that the low-voltage phase-shifting winding is arranged in a positive phase, and when the phase angle A1 is negative, it means that the low-voltage phase-shifting winding is arranged in an inverse phase.

[0010] Among them, after rectification, each coil outputs 2 high and low peak pulse outputs, and the output pulse number of the Y-Δ phase-shifting transformer with a 14-multiple winding output is 14×6×n (n = 1, 2, 3 or 4). That is to say, according to the structure of the present invention, n group windings can be designed. In theoretical design, n can continue to be enlarged, but in actual production, generally n is taken within 4, which is sufficient for the on-site use requirements.

[0011] Among them, the three coils of each low-voltage winding are connected in a extended side triangle. In theory, each winding or each coil contains a basic coil D1 and an extended coil Y1. The turn combinations of the basic coil D1 and the extended coil Y1 in each phase coil of the 14 low-voltage phase-shifting windings in different phase windings are configured according to the data in the above table. It should be noted that the basic coil D1 constitutes the basic triangular side of the extended side triangle, and the extended coil Y1 constitutes the extended side of the extended side triangle. When the number of turns of the basic coil D1 is zero, the three extended coils Y1 are connected in a Y shape in a special case. When the number of turns of the extended coil Y1 is zero, the three basic coils D1 are connected in a standard △ shape in a special case.

[0012] According to the above technical solution, its beneficial technical effect is that a Y-△ phase-shifting transformer with a 14-fold winding output is constructed based on the optimized data in the above table, and relatively optimized harmonic elimination effect and relatively balanced output waveform can be obtained. When there is a need for a Y-△ phase-shifting transformer with a 14-fold winding output, only the number of turns of the primary winding needs to be adaptively adjusted according to the different input voltage levels or output voltage levels, and then other indicators such as the wire diameter of the coil or the number of the small group windings are adjusted according to the different output powers, so as to achieve that the harmonic elimination quality and standard are not only relatively advantageous but also predictable and stable.

[0013] Secondly, the present invention also provides a power supply and distribution system applying the above Y-△ phase-shifting transformer with a 14-fold winding output, including the phase-shifting transformer, a high-voltage power distribution cabinet configured on the input side of the phase-shifting transformer, and a DC load power distribution cabinet configured on the output side of the phase-shifting transformer. The outgoing line end of the high-voltage power distribution cabinet is electrically connected to the three-phase high-voltage winding of the phase-shifting transformer, and the low-voltage phase-shifting winding of the phase-shifting transformer is electrically connected to the incoming line end of the DC load power distribution cabinet.

[0014] Due to the above advantages and characteristics of the present invention, it can be applied to the products and power supply and distribution systems of Y-△ phase-shifting transformers with a 14-fold winding output. Brief Description of the Drawings

[0015] Appendix Figure 1 is the wiring schematic diagram of the phase-shifting transformer 100 applying the present invention, Figure 1 in which the secondary low-voltage winding contains four types of extended side triangle windings of (a), (b), (c), and (d);

[0016] Appendix Figure 2 is the electrical structure schematic diagram of the power supply and distribution system;

[0017] Appendix Figure 3 is the layout structure schematic diagram of the power supply and distribution system. Detailed Embodiments

[0018] The following will describe the specific implementation structure of the Y-Δ phase-shifting transformer product 100 with a 14-multiple winding output and the power supply and distribution system in conjunction with the accompanying drawings. The Y-Δ phase-shifting transformer 100 with a 14-multiple winding output includes three iron core columns, on which three-phase high-voltage side windings and three-phase low-voltage side windings are arranged. The voltage level of the high-voltage side winding is 10 kV. Each phase coil of the high-voltage side winding is respectively installed on the three iron core columns. The high-voltage side winding is connected in a Y shape and connected to the 10 kV input system. The low-voltage side winding includes 28 low-voltage phase-shifting windings. Among them, every 14 low-voltage phase-shifting windings are bundled together as a group winding to form a winding unit, and 2 such group windings or winding units are arranged vertically on the iron core column. In order to measure the working temperatures in the high-voltage side winding and the low-voltage side winding, temperature probes are respectively arranged in them to detect and output the temperature signals of the coils to the central controller.

[0019] The 14 low-voltage phase-shifting windings of one group winding are constructed in a way of mixing the basic coil D1 and the extended coil Y1. The basic coil D1 is used to construct the triangular side of the phase-shifting winding, and the extended coil Y1 is used to construct the triangular extended side of the phase-shifting winding.

[0020] As Figure 1 shown, the three coils of each low-voltage phase-shifting winding are connected in a zigzag triangle. In theory, each low-voltage phase-shifting winding or each extended triangular coil contains the basic coil D1 and the extended coil Y1. The number of turns of the basic coil D1 and the number of turns of the extended coil Y1 included in the winding coils of different phases in the 14 low-voltage phase-shifting windings are specifically configured according to the data in the following table. It should be noted that the basic coil D1 forms the basic triangular side of the zigzag triangle, and the extended coil Y1 forms the extended side of the zigzag triangle. When the number of turns of the extended coil Y1 is zero, for example, the No. 1 coil at a phase angle of 30° listed in the table, the three basic coils D1 are connected in a Δ shape as shown in the example of Figure 1 Figure (a) therein. When the number of turns of the basic coil D1 is zero, for example, the No. 8 coil at a phase angle of 0° listed in the table, the three extended coils Y1 are connected in a Y shape as shown in the example of Figure 1 Figure (b) therein. And Figure 1 Figure (c) therein shows the layout structure schematic diagram when the low-voltage phase-shifting windings are arranged in a positive phase, and Figure 1 Figure (d) therein shows the layout structure schematic diagram when the low-voltage phase-shifting windings are arranged in a reverse phase.

[0021] This embodiment provides a phase distribution table for each of the 14 low-voltage phase-shifting windings, as well as a turn combination configuration table for the basic coil D1 and the extended coil Y1 in each phase coil corresponding to each phase angle. Based on the total number of turns of the basic coil D1 + the extended coil Y1 and the input-output voltage levels, data such as the number of turns of the input winding on the high-voltage side can be calculated according to common physical knowledge. Additionally, based on the magnitude of the output power, data such as the wire diameters of the input and output windings can be calculated.

[0022]

[0023]

[0024] Explanation example, for instance (1), the theoretical phase angle A1 of the low-voltage winding with serial number 1 is +30°, the number of turns of its basic coil D1 is 12 turns, and the number of turns of its extended coil Y1 is 0 turns, with a total of 12 turns. Thus, the low-voltage winding with serial number 1 is in a △ connection as shown in Figure (a) in Figure 1 (2), the theoretical phase angle A1 of the low-voltage winding with serial number 3 is +21.43°, the number of turns of its basic coil D1 is 9 turns, and the number of turns of its extended coil Y1 is 2 turns, with a total of 11 turns. Thus, the low-voltage winding with serial number 3 is in a positive-phase extended delta connection as shown in Figure (c) in Figure 1 (3), the theoretical phase angle A1 of the low-voltage winding with serial number 11 is -12.86°, the number of turns of its basic coil D1 is 5 turns, and the number of turns of its extended coil Y1 is 4 turns, with a total of 9 turns. Thus, the low-voltage winding with serial number 11 is in a negative-phase extended delta connection as shown in Figure (d) in Figure 1 .

[0025] As shown in Figure 2 , a power supply and distribution system includes a three-phase phase-shifting transformer 100, a high-voltage switchgear cabinet 101 configured on the input side of the phase-shifting transformer 100, and a DC load switchgear cabinet 102 configured on the output side of the phase-shifting transformer 100. The phase-shifting transformer 100 is also integrated in a separate switchgear cabinet. The high-voltage switchgear cabinet 101, the phase-shifting transformer 100, and the DC load switchgear cabinet 102 are arranged in sequence in a unit room. Among them, the voltage levels of the phase-shifting transformer 100 and the high-voltage switchgear cabinet 101 are 10KV. An outdoor 10KV three-phase high-voltage cable is connected to the input terminals of the high-voltage switchgear cabinet 101. The high-voltage switchgear cabinet 101 is at least equipped with a high-voltage disconnector and may even be installed with an overload protection switch. The output terminals of the high-voltage switchgear cabinet 101 are connected to the wiring terminals of the three-phase high-voltage end windings of the phase-shifting transformer 100 through high-voltage cables.

[0026] Among them, the low-voltage side winding itself outputs AC electric energy, but indirectly provides electric energy output for DC loads at the terminal, such as servers used in information centers, through rectifying devices (AC / DC) that convert AC to DC, such as rectifier module 4 and DC busbar 5. The output terminal of each low-voltage side winding is connected to at least one AC / DC rectifier module 4. The output voltage of the low-voltage side winding is adapted to the working voltage level of the rectifier module 4, and the output voltage of the rectifier module 4 is in turn adapted to the working voltage level of the DC busbar 5. In specific circuit arrangements, the output terminal of the low-voltage side winding is connected to the input terminal of the DC load power distribution cabinet 102 through a terminal block and electrical leads. The rectifier module 4 and the DC busbar 5 are arranged in the DC load power distribution cabinet 102. Isolating switches can be provided for connection between the DC busbars in different DC load power distribution cabinets 102. The input terminal of the rectifier module 4 can even be connected to the input terminal of the DC load power distribution cabinet 102 through a control switch and an overload protection switch. The output terminal of the rectifier module 4 is electrically connected to the DC busbar 5 through a control switch.

[0027] In the design of actual applications, for different output powers, adjustments can be made by changing the wire diameter of the coils on the high- and low-voltage sides, the number of sub-windings of the output winding on the low-voltage side, etc.; for different input voltage levels, by changing the number of turns of the input high-voltage side winding, different levels of low-voltage AC voltages can be output from the low-voltage side winding, so that the output voltage levels of the rectifier module 4 or the DC busbar 5 can be one of DC336V, 240V, 110V, 64V, 48V, or even 12V, for providing DC power to DC loads such as servers used in information centers. The output terminal of the DC busbar 5 can also be separately connected to different individual load devices, such as a server host, through a discrete switch.

[0028] Among them, the number of low-voltage side windings arranged on each iron core column can be designed and determined as 14×n (n = 1, 2, 3, or 4) according to factors such as the size of the load itself and the capacity of the rectifier module 4. Further, an energy storage device (not shown in the figure) is also arranged on the side of the DC load power distribution cabinet 102. The energy storage device is a battery pack, and the battery pack is connected to the DC busbar 5 through an energy storage controller. The energy storage controller is signal-connected to the central controller and is used for two-way operation, capable of both charging the battery pack and releasing electric energy to the DC busbar 5.

[0029] Further, PT100 temperature probes (not shown in the figure) of, for example, a certain model are respectively provided in the high-voltage side winding and the low-voltage side winding. A dedicated central control cabinet 103 is also provided on the side of the DC load power distribution cabinet 102. A central controller is provided in the central control cabinet 103, and the temperature probes are signal-connected to the central controller. Secondly, the control switches in the high-voltage power distribution cabinet 101 and the DC load power distribution cabinet 102 are also all signal-connected to the central controller. In this way, the central controller can not only control the control switches in the high-voltage power distribution cabinet 101 and the DC load power distribution cabinet 102 in an associated manner, but also respond to the transformer temperature signals provided by the temperature probes to implement alarm or control the high-voltage switch on the primary side or the low-voltage switch on the secondary side. Secondly, a remote communication unit can also be provided in the central control cabinet 103, and the central controller can interact various signals such as voltages, currents, power consumption, and temperatures with a remote control or monitoring center through the remote communication unit.

[0030] The transformer 100 and the applied power supply and distribution system according to the embodiments of the present disclosure can not only directly convert high voltage into low voltage, thereby simplifying the structure of the high-voltage power supply circuit, but also have a relatively good harmonic elimination effect due to the relatively optimized electrical structure of the low-voltage side winding.

Claims

1. A Y-Δ phase-shifting transformer with a 1.14-times multiple winding output, where the high-voltage side winding is connected in a Y configuration, and the low-voltage side winding includes at least one sub-winding. Each of the sub-windings includes 14 three-phase low-voltage phase-shifting windings connected in an extended Δ configuration. Each phase coil of the low-voltage phase-shifting winding is composed of a basic coil D1 and an extended coil Y1. The basic coil D1 is used to construct the triangular side of the phase-shifting winding, and the extended coil Y1 is used to construct the triangular extended side of the phase-shifting winding. It is characterized in that, The theoretical phase angle distribution of each low-voltage phase-shifting winding of each of the group windings, and the turn combination configuration of the basic coil D1 and the extended coil Y1 in each phase coil of different phase windings are arranged according to the data listed in the following table; Among them, when the number of turns of the extended coil Y1 is zero, the low-voltage phase-shifting winding is entirely composed of the basic coil D1 to form a △-connected winding. When the number of turns of the basic coil D1 is zero, the low-voltage phase-shifting winding is entirely composed of the extended coil Y1 to form a Y-connected winding; when the phase angle A1 is positive, it means that the low-voltage phase-shifting winding is arranged in a positive phase, and when the phase angle A1 is negative, it means that the low-voltage phase-shifting winding is arranged in an inverse phase.

2. The phase-shifting transformer according to claim 1, wherein The coils of each phase of one of the group windings are tightly bound together, and the coils of different group windings are arranged side by side vertically.

3. The phase-shifting transformer according to claim 1, wherein, Temperature probes are respectively arranged in the high-voltage terminal winding and the low-voltage terminal winding for detecting and outputting the temperature signal of the coil.

4. A power supply and distribution system, comprising the phase-shifting transformer according to claim 1, 2 or 3, a high-voltage power distribution cabinet arranged on the input side of the phase-shifting transformer, and a DC load power distribution cabinet arranged on the output side of the phase-shifting transformer. The outgoing line end of the high-voltage power distribution cabinet is electrically connected to the three-phase high-voltage winding of the phase-shifting transformer, and the low-voltage phase-shifting winding of the phase-shifting transformer is electrically connected to the incoming line end of the DC load power distribution cabinet.

5. The power supply and distribution system according to claim 4, characterized in that, An AC / DC rectification module and a DC busbar are arranged in the DC load power distribution cabinet. The rectification module is used to rectify the AC signal provided by the low-voltage phase-shifting winding into a DC signal and output it to the DC busbar, and the DC busbar is used to provide DC power to the DC load.

6. The power supply and distribution system according to claim 5, wherein Each output end of the low-voltage phase-shifting winding is connected to at least one AC / DC rectification module.

7. The power supply and distribution system according to claim 5, wherein It further includes an energy storage device, and the energy storage device is connected to the DC busbar through an energy storage controller.

8. The power supply and distribution system according to claim 4, characterized in that, It further includes a central control cabinet arranged on the side of the DC load power distribution cabinet. A central controller is arranged in the central control cabinet, and the central controller is signal-connected to the control switches arranged in the high-voltage power distribution cabinet and the DC load power distribution cabinet.

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