WO2023108339A1

WO2023108339A1 - Solid-state transformer, power supply equipment, and data center

Info

Publication number: WO2023108339A1
Application number: PCT/CN2021/137448
Authority: WO
Inventors: 石磊; 水伟; 舒州; 姚文海
Original assignee: 华为数字能源技术有限公司
Priority date: 2021-12-13
Filing date: 2021-12-13
Publication date: 2023-06-22
Also published as: CN117561671A

Abstract

A solid-state transformer, power supply equipment, and a data center. The space of the solid-state transformer can be saved, and communication costs can be reduced. The solid-state transformer comprises a medium-voltage conversion circuit, a high-frequency transformer, and a low-voltage conversion circuit which are connected in sequence; the medium-voltage conversion circuit comprises M voltage modules connected in series; the solid-state transformer further comprises a first control circuit connected to the medium-voltage conversion circuit and a second control circuit connected to the low-voltage conversion circuit; the first control circuit comprises M voltage control modules and a voltage converter assembly; the voltage converter assembly makes every two adjacent voltage control modules in signal connection, so as to transmit signals of the rest voltage control modules to a target voltage control module; the second control circuit is coupled with the target voltage control module; the second control circuit obtains the signal of each voltage control module by means of the target voltage control module, and outputs a first signal to each voltage control module by means of the voltage converter assembly.

Description

A solid state transformer, power supply and data center

technical field

The present application relates to the field of power electronics, in particular to a solid-state transformer, power supply equipment and a data center.

Background technique

Solid-state transformers are also called power electronic transformers. In solid-state transformers, power electronic conversion technology and high-frequency power conversion technology based on the principle of electromagnetic induction are combined to transform the power of one power characteristic into another power characteristic. electrical energy. A solid-state transformer usually includes a medium-voltage conversion circuit, a high-frequency transformer, and a low-voltage conversion circuit. The controller of the medium-voltage conversion circuit communicates with the controller of the low-voltage conversion circuit to control the working state of the solid-state converter. Among them, the medium-voltage conversion circuit includes a plurality of voltage modules for voltage conversion, so the controller of the medium-voltage conversion circuit includes a voltage control module for each voltage module, and each voltage control module is connected with the controller of the low-voltage conversion circuit. When communicating, each voltage control module is usually equipped with an optical module and an optical fiber channel connected to the optical module for communication, but this communication method cannot directly communicate between two voltage control modules, and each voltage control module is also Communication devices and channel paths need to be configured, resulting in wasted space and material for solid-state transformers.

Contents of the invention

The present application provides a solid-state transformer, a power supply device and a data center, which can save the space of the solid-state transformer and reduce communication costs.

In a first aspect, the present application provides a solid-state transformer, which includes a medium-voltage conversion circuit and a low-voltage conversion circuit connected in phase, and the medium-voltage conversion circuit includes M voltage modules connected in series. Specifically, the solid-state transformer further includes a first control circuit connected to the medium-voltage conversion circuit and a second control circuit connected to the low-voltage conversion circuit.

Wherein, the first control circuit includes M voltage control modules and voltage converter components, one of the M voltage control modules is a target voltage control module, and the remaining voltage control modules are M voltage control modules except the target voltage control module The voltage control module, the voltage converter component is used to connect signals between every two adjacent voltage control modules, so as to transmit the signals of the remaining voltage control modules to the target voltage module. Wherein, M is an integer greater than 1.

The second control circuit is coupled with the target voltage control module, and the second control circuit is used to obtain the signal of each voltage control module through the target voltage control module, and output the first signal containing the operation information of the low-voltage conversion circuit to the Each voltage control module.

By adopting the above-mentioned solid-state transformer, the voltage converter component can connect the signals between every two adjacent voltage control modules, so as to realize the communication between the M voltage control modules. In addition, since the voltage control modules can communicate through the voltage converter component, when the first control circuit communicates with the second control circuit, the voltage converter component can be used to converge the signals of the M voltage control modules to the target The voltage control module is used for signal transmission through the signal transmission channel between the target voltage control module and the second control circuit, so that there is no need to configure communication devices for the residual voltage control module, which reduces the communication cost of the solid-state transformer and reduces the cost of the solid-state transformer. volume.

In a possible implementation manner, a main transmission channel is connected between the target voltage control module and the second control circuit.

Wherein, the main transmission channel includes: a first optical fiber transmission line and a second optical fiber transmission line. The first optical fiber transmission line is used to transmit the signals of the M voltage control modules to the second control circuit. The second optical fiber transmission line is used to transmit the first signal to the target voltage control module.

By adopting the above-mentioned solid-state transformer, the signal transmission between the first control circuit and the second control circuit can be carried out through optical fiber transmission.

In a possible implementation manner, an auxiliary transmission channel is further connected between the target voltage control module and the second control circuit.

Wherein, the auxiliary transmission channel includes: a third optical fiber transmission line and a fourth optical fiber transmission line. The third optical fiber transmission line is used to transmit the signals of the M voltage control modules to the second control circuit when the main transmission channel fails. The fourth optical fiber transmission line is used to transmit the first signal to the target voltage control module when the main transmission channel fails.

By adopting the above-mentioned solid-state transformer, the auxiliary transmission channel can be used for transmission channel backup, so as to ensure normal communication between the first control circuit and the second control signal.

In a possible implementation manner, the target voltage control module includes: a controller and an optical module.

Wherein, the optical module is connected with the optical fiber transmission line. The controller is respectively connected with the optical module and the voltage converter assembly.

Using the above-mentioned solid-state transformer, the controller can control the voltage converter of the voltage module, and the optical module can convert the information to be sent by the controller into an optical signal, and transmit it to the second control module through the connected optical fiber transmission line to realize the first control communication between the circuit and the second control circuit.

In a possible implementation manner, the voltage converter component forms a first signal transmission channel. The first signal transmission channel is used to transmit the signal of the residual voltage control module to the target voltage control module, and transmit the first signal to the residual voltage control module.

Using the above solid-state transformer, the first signal transmission channel can be used to gather the information to be sent from the remaining voltage control module to the target voltage control module, and use the optical fiber transmission line connected to the target voltage control module to transmit the information of all voltage control board modules to the second The second control circuit, so that all the voltage control modules can communicate with the second control circuit.

In a possible implementation manner, two adjacent voltage control modules are connected through a first voltage converter, and a plurality of first voltage converters form a first signal transmission channel.

Using the above-mentioned solid-state transformer, the first voltage converter is used to realize the signal transmission between the two voltage control modules, that is, the first voltage converter realizes the transmission of bidirectional signals, and the first converter is multiplexed to reduce the communication of the solid-state transformer component count, reducing the cost of solid-state transformers.

In a possible implementation manner, two adjacent voltage control modules are connected through the second voltage converter and the third voltage converter. The plurality of second voltage converters are used to transmit signals from the remaining voltage control module to the target voltage control module. A plurality of third voltage converters are used to transmit the first signal to the residual voltage control module.

Using the above-mentioned solid-state transformer, two adjacent voltage control modules are respectively connected for signal through a second voltage converter and a third voltage converter. The second voltage converter and the third voltage converter perform transmission in one direction respectively, which speeds up the signal transmission rate of two adjacent voltage control modules.

In a possible implementation manner, the voltage converter component forms a plurality of second signal transmission channels.

Wherein, each second signal transmission channel corresponds to each voltage control module in the residual voltage control module, and each voltage control module in the residual voltage control module transmits the signal to the target voltage control module through the corresponding second signal transmission channel module, and receive the first signal through the corresponding second signal transmission channel.

Using the above-mentioned solid-state transformer, a second signal transmission channel to the target voltage control module can be configured for each voltage control module among the remaining voltage modules, and each voltage control module can communicate with the target voltage through the corresponding second signal transmission channel The control module performs signal transmission, and the transmission of each second signal transmission channel does not affect each other, avoiding the risk that multiple voltage control modules cannot perform signal transmission due to a failure of a single voltage converter.

In a possible implementation, two adjacent voltage control modules between the first set voltage control module and the target voltage control module are connected through a fourth voltage converter; multiple fourth voltage converters form the first Set the second signal transmission channel corresponding to the voltage control module. Wherein, the first set voltage control module is one of the remaining voltage control modules.

Using the above-mentioned solid-state transformer, a plurality of fourth voltage converters connected between the first set voltage control module and the target voltage control module can constitute the second signal transmission channel corresponding to the first set voltage control module, and the fourth voltage conversion The device realizes bidirectional signal transmission between two adjacent voltage control modules.

In a possible implementation manner, two adjacent voltage control modules between the second set voltage control module and the target voltage control module are connected through a fifth voltage converter and a sixth voltage converter; The five voltage converters are used to transmit the signal of the second set voltage control module to the target voltage control module; the plurality of sixth voltage converters are used to transmit the first signal to the second set voltage control module. Wherein, the second set voltage control module is one of the remaining voltage control modules;

Using the above-mentioned solid-state transformer, a plurality of fifth voltage converters and sixth voltage converters connected between the second set voltage control module and the target voltage control module can constitute the second signal transmission corresponding to the second set voltage control module The channel, the fifth voltage converter and the fifth voltage converter respectively perform signal transmission in one direction.

In a second aspect, the present application provides a power supply device, which includes a cabinet and the solid-state transformer provided in the first aspect of the present application and any possible design thereof. Wherein, the solid-state transformer is arranged in the cabinet.

In a third aspect, the present application provides a data center, the data center includes a load device, and also includes the power supply device provided in the second aspect of the present application and any possible design thereof.

Among them, the medium-voltage conversion circuit is used to connect with the power grid, and the low-voltage conversion circuit is connected to the load equipment.

Description of drawings

FIG. 1 is a schematic diagram of an application scenario of a solid-state transformer provided in an embodiment of the present application;

FIG. 2 is a schematic structural diagram of a solid-state transformer provided in an embodiment of the present application;

FIG. 3 is a schematic structural diagram of a medium voltage conversion circuit provided in an embodiment of the present application;

Fig. 4 is a structural schematic diagram II of a solid-state transformer provided in the embodiment of the present application;

FIG. 5 is a first structural schematic diagram of a voltage converter assembly provided by an embodiment of the present application;

FIG. 6 is a first schematic diagram of signal transmission of a voltage converter component provided by an embodiment of the present application;

FIG. 7 is a second structural schematic diagram of a voltage converter assembly provided by an embodiment of the present application;

FIG. 8 is a second schematic diagram of signal transmission of a voltage converter component provided by an embodiment of the present application;

FIG. 9 is a schematic structural diagram III of a voltage converter assembly provided by an embodiment of the present application;

FIG. 10 is a third schematic diagram of signal transmission of a voltage converter component provided in an embodiment of the present application.

Detailed ways

Embodiments of the present application will be described in detail below in conjunction with the accompanying drawings.

In order to clearly understand the solid-state transformer provided by the present application, the following will describe in detail with reference to the drawings and specific embodiments.

The specific operation methods in the method embodiments can also be applied to the device embodiments or system embodiments. It should be noted that, in the description of this application, "plurality" only means "two or more". "And/or" describes the association relationship of associated objects, indicating that there may be three types of relationships, for example, A and/or B, may indicate: A exists alone, A and B exist simultaneously, and B exists independently. In addition, the character "/", unless otherwise specified, generally indicates that the associated objects before and after are in an "or" relationship. In addition, it should be understood that in the description of this application, words such as "first" and "second" are only used for the purpose of distinguishing descriptions, and cannot be understood as indicating or implying relative importance, nor can they be understood as indicating or imply order.

It should be noted that the "connection" in this embodiment of the present application may be an electrical connection or a communication connection. The electrical connection of two electrical components may be a direct or indirect connection between the two electrical components. For example, the connection between A and B can be either direct connection between A and B, or indirect connection between A and B through one or more other electrical components, such as A and B connection, or A and C direct connection, C and B are directly connected, and A and B are connected through C.

Reference to "one embodiment" or "some embodiments" or the like in this specification means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the present application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in other embodiments," etc. in various places in this specification are not necessarily All refer to the same embodiment, but mean "one or more but not all embodiments" unless specifically stated otherwise. The terms "including", "comprising", "having" and variations thereof mean "including but not limited to", unless specifically stated otherwise.

It should be pointed out that the switching tube in the embodiment of the present application can be a relay, a metal oxide semiconductor field effect transistor (MOSFET), a bipolar junction transistor (BJT), an insulated gate One or more of various types of switching devices such as bipolar transistor (insulated gate bipolar transistor, IGBT), gallium nitride field effect transistor (GaN), silicon carbide (SiC) power tube, etc., the embodiment of the present application This will not list them one by one. Each switch device may include a first electrode, a second electrode and a control electrode, wherein the control electrode is used to control the switch device to be turned on or off. When the switch device is turned on, current can be transmitted between the first electrode and the second electrode of the switch device, and when the switch device is turned off, no current can be transmitted between the first electrode and the second electrode of the switch device. Taking MOSFET as an example, the control electrode of the switching device is the gate, the first electrode of the switching device may be the source of the switching device, the second electrode may be the drain of the switching device, or the first electrode may be the drain of the switching device pole, and the second electrode may be the source of the switching device.

It should be pointed out that the "voltage conversion ratio" of the device in the embodiment of the present application refers to the ratio between the input voltage and the output voltage of the device. If the device implements step-down conversion, the output voltage of the device is lower than the input voltage of the device, then The voltage conversion ratio of the device is greater than 1. If the device implements boost conversion, the output voltage of the device is greater than the input voltage of the device, and the voltage conversion ratio of the device is less than 1.

The solid-state transformer can be used as an intermediate device between the grid and the load equipment to convert the voltage transmitted in the grid for use by the load equipment. Typically, solid-state transformers connect the medium-voltage grid and the low-voltage load separately. For example, in a data center, multiple load devices (such as servers) are usually included. The medium-voltage power grid enters the computer room for power supply, and its power supply voltage is usually medium-voltage (such as 10kV) AC, while the load equipment in the data center usually requires low-voltage (such as 220V or 400V) DC or AC as the working voltage. Therefore, the output voltage of the medium-voltage grid is usually processed by a solid-state transformer to convert the output voltage of the medium-voltage grid into the voltage size and type required by the load equipment. Or, in some other application scenarios, solid-state transformers can also convert the electrical energy generated on the low-voltage side and transmit it to the medium-voltage grid. For example, solid-state transformers can be connected to medium-voltage grids and photovoltaic power stations. The solid-state transformer can boost the electric energy generated by the photovoltaic power station, and then transmit the converted electric energy to the medium-voltage grid.

In actual use, the electric energy transmitted in the medium-voltage power grid may be single-phase alternating current, and the electric energy transmitted in the medium-voltage power grid may also be three-phase alternating current. The three-phase alternating current can be composed of three single-phase alternating currents with a phase difference of 120 degrees, and the three single-phase alternating currents can be A-phase alternating current, B-phase alternating current and C-phase alternating current. Referring to Fig. 1, the transmission line used to transmit single-phase alternating current in the medium-voltage grid 01 can be connected to a solid-state transformer 10, and the solid-state transformer 10 can convert the single-phase alternating current transmitted on the connected transmission line, and convert the converted The electric energy output to bus 02. Wherein, the bus 02 may be an AC bus or a DC bus. The bus bar 02 is connected to at least one load device and supplies power to the connected load device.

In an example, a transmission line for transmitting single-phase alternating current in the medium voltage grid 01 may be connected with two solid-state transformers. Under normal circumstances, the first solid-state transformer works, and the second solid-state transformer does not work. The first solid-state transformer converts the single-phase AC power transmitted on the connected transmission line, and outputs the converted electric energy to the bus 02 . When the first solid-state transformer fails, the second solid-state transformer starts to work, and the second solid-state transformer converts the single-phase alternating current transmitted on the connected transmission line, so as to ensure the power supply stability of the medium voltage grid 01 .

As shown in FIG. 2 , the solid-state transformer 10 may include a medium voltage conversion circuit 101 (medium voltage side power conversion circuit), a high frequency transformer 102 and a low voltage conversion circuit 103 (low voltage side power conversion circuit). The medium-voltage conversion circuit 101 and the low-voltage conversion circuit 103 may be coupled through a high-frequency transformer 102 . Among them, the medium-voltage conversion circuit 101 is used for connecting with the transmission line for transmitting single-phase AC power in the medium-voltage grid 01 , and the low-voltage conversion circuit 103 is used for connecting with at least one load device 03 through the bus 02 .

It should be noted that medium voltage and low voltage only represent two relative concepts, rather than limiting the voltage. That is, the voltage of the medium voltage conversion circuit 101 is greater than the voltage of the low voltage conversion circuit 103 .

In actual use, the medium-voltage conversion circuit 101 can convert the single-phase AC power transmitted on the connection transmission line, and output the converted electric energy to the low-voltage conversion circuit 103 through the high-frequency transformer 102 . The low-voltage conversion circuit 103 receives the electric energy output by the high-frequency transformer 102 , performs step-down processing on the received electric energy, and converts the received electric energy into AC or DC according to the power supply requirements of the load device 03 . It should be noted that since the transformer has the function of electrical isolation, when the medium-voltage grid 01 supplies power to the load equipment 03 through the solid-state transformer 10, the high-frequency transformer 102 can realize the electrical connection between the medium-voltage grid 01 and the load equipment 03. isolation to ensure power supply security.

The solid state transformer 10 also includes a medium voltage controller 104 connected to the medium voltage conversion circuit 101 , and a low voltage controller 105 connected to the low voltage conversion circuit 103 . The medium voltage controller 104 is communicatively connected to the low voltage controller 105 . Wherein, the medium voltage controller 104 can control the working state of the medium voltage conversion circuit 101 to adjust the voltage conversion ratio of the medium voltage conversion circuit 101 . The low-voltage controller 105 can control the working state of the low-voltage conversion circuit 103 and adjust the voltage conversion ratio of the low-voltage conversion circuit 103 .

Specifically, the medium voltage controller 104 can output the operation information of the connected medium voltage conversion circuit 101 to the low voltage controller 105, and the low voltage controller 105 can also output the operation information of the connected low voltage conversion circuit 103 to the medium voltage controller 104 . The medium-voltage controller 104 and the low-voltage controller 105 can adjust the state of the connected conversion circuit according to the received operation information, so that the electric energy output by the solid-state transformer 10 can meet the demand for electric energy of the load device 03, and ensure the power of the solid-state transformer 10. Safe to run.

In actual use, the voltage amplitude of the single-phase alternating current received by the medium-voltage conversion circuit 101 is relatively high, and the voltage conversion capability of a single voltage conversion device is limited. Therefore, in order to meet the voltage conversion requirements of the solid-state converter 10, see FIG. 3 , the medium voltage conversion circuit 101 may include multiple voltage modules for voltage conversion, and the multiple voltage modules are connected in series.

It should be understood that since the input sides of multiple voltage modules are connected in series, after the medium voltage conversion circuit 101 receives the single-phase AC power transmitted by the transmission line, multiple voltage modules connected in series can divide the single-phase AC power received by the solid-state transformer 10 pressure treatment. Each voltage module receives a part of single-phase AC power and converts a part of the received single-phase AC power. It should be understood that the number of voltage modules connected in series may be set according to the voltage conversion capability of a single voltage module and the voltage amplitude of the single-phase alternating current, which is not limited in this application.

In an example, the primary side of the high frequency transformer 102 has a plurality of first windings. Each first winding corresponds to each voltage module one by one, and each first winding is connected to an output terminal of the corresponding voltage module. The secondary side of the high frequency transformer 102 has a second winding. The second winding is connected to the low-voltage conversion circuit 103 , so as to transmit the electric energy output by the multiple voltage modules to the low-voltage conversion circuit 103 .

In another example, the high frequency transformer 102 includes a first transformer and a plurality of second transformers. Each second transformer corresponds to each voltage module one by one, the primary winding of each second transformer is connected to the output end of the corresponding voltage module, and the secondary winding of each second transformer is connected to the primary winding of the first transformer. winding connection. The secondary winding of the second transformer is connected to the low-voltage conversion circuit 103 , so as to transmit the electric energy output by the medium-voltage conversion circuit 101 to the low-voltage conversion circuit 103 .

In actual use, in order to implement voltage conversion control for multiple voltage modules, the medium voltage controller 104 may include a voltage control module connected to each voltage module in a one-to-one correspondence. Each voltage control module is used for switching control of the connected voltage modules.

With the above-mentioned solid-state transformer structure, if communication between the medium-voltage controller 104 and the low-voltage controller 105 is to be realized, each voltage control module needs to be connected to the low-voltage controller 105 for signals. Therefore, each voltage control module needs to be equipped with a signal transmission channel and a data conversion module corresponding to the signal transmission channel, and the corresponding low-voltage controller also needs to be equipped with the same number of data conversion modules as the voltage control module. The voltage control module can convert the signal to be sent into data that can be directly transmitted by the signal transmission channel through the data conversion module, and transmit the data to the low-voltage controller through the connected signal transmission channel. That is, a signal transmission path needs to be configured between each voltage module and the low-voltage controller 105 . However, setting such a communication structure will significantly increase the number of communication devices of the solid-state transformer, thereby increasing the manufacturing cost of the solid-state transformer. In addition, because the various voltage control modules cannot directly communicate with each other, when a certain voltage control module or a voltage module connected to the voltage control module fails, other voltage control modules that have not failed need to be transmitted through the low-voltage controller 105. The fault information of the voltage module or voltage control module can be obtained. During this period, other voltage modules connected to the fault voltage module or the voltage module connected to the fault voltage control module may have been damaged due to overvoltage or overcurrent, affecting Operational safety of solid-state transformers.

In order to solve the above problems, the embodiments of the present application provide a solid-state transformer, a power supply device, and a data center that can effectively reduce communication costs and help improve safety.

As shown in FIG. 4 , it is a solid-state transformer provided in the embodiment of the present application. 4, the solid-state transformer 40 includes a medium-voltage conversion circuit 401 and a low-voltage conversion circuit 402 connected to each other. The solid-state transformer 40 also includes a first control circuit 404 connected to the medium-voltage conversion circuit 401 and a low-voltage conversion circuit 403. The second control circuit 405. M is an integer greater than 1.

In the embodiment of the present application, a high-frequency transformer 403 may also be connected between the medium-voltage conversion circuit 401 and the low-voltage conversion circuit 402 , and the high-frequency transformer 403 may realize electrical isolation between the medium-voltage conversion circuit 401 and the low-voltage conversion circuit 402 .

Specifically, the first control circuit 404 includes M voltage control modules 4041 and voltage converter components 4042, one of the M voltage control modules 4041 is a target voltage control module, and the remaining voltage control module 4041 is one of the M voltage control modules 4041 A voltage control module 4041 other than the target voltage control module 4041 . The voltage converter component 4042 is used to connect signals between every two adjacent voltage control modules 4041, so as to transmit the signal of the remaining voltage control module 4041 to the target voltage control module 4041, wherein each voltage control module 4041 is connected to each The voltage modules are connected in one-to-one correspondence, and each voltage control module can control the voltage conversion ratio of the connected voltage modules. The signal of each voltage control module 4041 may be the operation information of the voltage modules connected to the voltage control module 4041 .

Wherein, the second control circuit 405 is coupled with the target voltage control module 4041, and the second control circuit 405 is used to obtain the signal of each voltage control module 4041 through the target voltage control module 4041, and the first signal containing the operation information of the low-voltage conversion circuit Output to each voltage control module 4041 through the voltage converter component 4042.

In practical applications, the solid-state transformer 40 is provided with a fixed interface to realize the connection between the medium-voltage power grid and the solid-state transformer 40 , and to realize the connection between the load equipment and the solid-state transformer 40 . In this case, the solid state transformer 40 can be regarded as a device independent of the medium voltage grid and load equipment.

In actual implementation, the voltage module can be composed of switches, diodes, inductors, capacitors and other devices. The voltage conversion ratio of the voltage module can be realized by adjusting the working state of these devices (such as switches).

In the present application, the adjustment of the above working state can be realized through the voltage control module. That is, the voltage control module includes a controller, which can be used to control the voltage module to perform voltage conversion on a part of the received AC power.

In actual implementation, the controller can be connected to the control electrode of the switch in the connected voltage module, and control the working state of the control switch by outputting a corresponding amplitude driving signal for the control electrode of the switch, so as to adjust the voltage of the voltage module conversion ratio.

Specifically, if the switch in the voltage module is a MOS, the controller can be connected to the gate of the MOS transistor, so that the voltage module can convert the received AC power by controlling the on-off of the MOS transistor; if the switch in the voltage module is a BJT , the controller can be connected to the base of the BJT, and the voltage module can perform voltage conversion on a part of the received alternating current by controlling the on-off of the BJT.

During specific implementation, the controller can be a micro control unit (micro controller unit, MCU), a central processing unit (central processing unit, CPU), a field programmable gate array (field programmable gate array, FPGA), a digital signal processor ( Any one of digital signal processor, DSP). Of course, the specific form of the controller is not limited to the above examples.

It should be understood that the medium-voltage conversion circuit 401 , high-frequency transformer 403 and low-voltage conversion circuit 402 provided in the embodiment of the present application have the same structure and function as those of the existing solid-state transformer, and the present application will not repeat them here.

As shown in FIG. 4 , each voltage control module 4041 receives the power supply voltage from the connected voltage module, and controls the working state of the connected voltage module. Since multiple voltage modules are connected in series, there is a potential difference between two adjacent voltage modules connected in series, so there is also a certain potential difference between the adjacent voltage control modules 4041 connected to these two voltage modules . The voltage converter component 4042 has a voltage conversion function, which can eliminate the potential difference between two adjacent voltage control modules 4041 to realize the signal connection between two adjacent voltage control modules 4041 . That is, the voltage converter component 4042 can realize the communication requirements among the M voltage control modules 4041 through the signal connection between every two adjacent voltage control modules 4041 .

In addition, because the voltage converter component 4042 can realize the communication between M voltage control modules 4041, therefore, the signals to be sent by the remaining voltage control modules 4041 can be converged to the target voltage control module through the voltage converter component 4042, and transmitted through the target The voltage control module 4041 sends the signal to the second control circuit 405, and transmits the first signal sent by the second control circuit 405 to all the voltage control modules 4041 through the voltage converter component 4042, so as to realize the connection between each voltage control module 4041 and the first signal. Communication between the two control circuits 405 . In summary, in the solid-state transformer 40 provided by the embodiment of the present application, a communication path is configured between the target voltage control module in the first control circuit 404 and the second control circuit 405, so that all voltage control modules 4041 and The communication of the second control circuit 405 is conducive to reducing the number of communication devices between the first control circuit 404 and the second control circuit 405, reducing the communication cost of the solid-state transformer 40, and because the voltage control module can be realized through the voltage converter component 4042 The direct communication between 4041 does not need to be forwarded by the second control circuit 405. Therefore, when a certain voltage module and/or voltage control module 4041 fails, the fault information can be directly sent to other unconnected through the voltage converter component 4042. The faulty voltage control module 4041 is used to switch the connection between the non-faulty voltage module and the faulty voltage module, so as to realize fault source isolation and ensure the safety of the solid-state transformer 40 .

In a specific application, the residual voltage control module 4041 in the first control circuit 404 converges the signal to the target voltage control module 4041 through the voltage converter component 4042, and the target voltage control module 4041 sends the received information and the signal to be sent by itself For the second control circuit 405 , there is a communication connection requirement between the target voltage control module 4041 and the second control circuit 405 . Therefore, the connection between the target voltage control module 4041 and the second control circuit 405 can be realized through an additional cable. In the solid-state transformer 40 provided in the embodiment of the present application, a main transmission channel may be connected between the target voltage control module 4041 and the second control circuit 405 .

In actual use, the main transmission channel includes a first optical fiber transmission line and a second optical fiber transmission line. The first optical fiber transmission line is used to transmit the signals of the M voltage control modules 4041 to the second control circuit 405 . The second optical fiber transmission line is used to transmit the first signal to the target voltage control module 4041 .

In a possible implementation manner, in order to ensure normal communication between the first control circuit 404 and the second control circuit 405 , an auxiliary transmission channel may also be connected between the target voltage control module 4041 and the second control circuit 405 . When the main transmission channel is normal, the auxiliary transmission channel does not work, and the signal transmission between the first control circuit 404 and the second control circuit 405 is performed by the main transmission channel. When the main transmission channel fails, the auxiliary transmission channel performs signal transmission between the first control circuit 404 and the second control circuit 405 .

Wherein, the auxiliary transmission channel includes a third optical fiber transmission line and a fourth optical fiber transmission line. The third optical fiber transmission line is used to transmit the signals of the M voltage control modules 4041 to the second control circuit 405 when the main transmission channel fails. The fourth optical fiber transmission line is used to transmit the first signal to the target voltage control module 4041 when the main transmission channel fails.

It should be understood that since the optical fiber transmission line transmits optical signals, the target voltage control module 4041 not only includes a controller for controlling the state of the connected voltage module, but also includes a controller for converting the signal to be sent into an optical signal. optical module. Among them, the optical module can be composed of optoelectronic devices, functional circuits and optical interfaces.

Specifically, the optical modules are respectively connected to the controller and the optical fiber transmission line, and the optical modules can convert the signals sent by the voltage converter component 4042 received by the controller through the voltage converter assembly 4042 and their own signals to be sent into optical signals, and transmit the signals through the connection The optical fiber transmission line is transmitted to the second control circuit 405; and the optical signal sent by the second control circuit 405 is received from the optical fiber transmission line, and the received optical signal is converted, and the converted signal is sent to the controller. In order to transmit signals to the first control circuit 404 through the optical fiber transmission line, the corresponding second control circuit 405 also includes an optical module connected to the optical fiber transmission line, and the optical module can receive the target voltage control module 4041 through the optical fiber transmission line. The transmitted optical signal is converted, and the converted signal is output to the controller in the second control circuit 405, and the first signal sent by the controller is converted into an optical signal, and transmitted to the target voltage control module through the connected optical fiber channel 4041.

In actual use, the structure of the voltage converter assembly 4042 for realizing signal connection between every two adjacent voltage control modules 4041 may be various.

In order to facilitate the understanding of the voltage converter assembly 4042 provided in the implementation of the present application, various structures of the voltage converter assembly 4042 will be specifically described below in conjunction with embodiments.

Referring to FIG. 5 , in an embodiment provided by the present application, the voltage converter component 4042 includes a plurality of first voltage converters, and the plurality of first voltage converters form a first signal transmission channel. The first signal transmission channel is used to transmit the signal of the residual voltage control module 4041 to the target voltage control module 4041 and transmit the first signal to the residual voltage control module 4041 .

In specific use, two adjacent voltage control modules 4041 are connected through a first voltage converter, and the first voltage converter can eliminate the potential difference between two adjacent voltage control modules 4041 .

It can be understood that, since a first voltage converter is arranged in two adjacent voltage control modules 4041 , the first voltage converter can eliminate the potential difference between two adjacent voltage control modules 4041 . When two adjacent voltage control modules 4041 are in the same phase, the two voltage control modules 4041 can directly communicate with each other, so as to realize the signal connection between the two adjacent voltage control modules 4041 . The two adjacent voltage control modules 4041 are connected to the two adjacent voltage modules connected in series. Since the potential difference between the two adjacent voltage modules connected in series is the lowest, a voltage converter with a transparent voltage conversion ratio can be selected as the first voltage converter. For the voltage converter, when the voltage conversion ratio of the first voltage converter is lower, the cost and volume of the first voltage converter are smaller, which can help reduce the cost and volume of the voltage converter component 4042 .

In a specific implementation, the voltage converter used to eliminate the potential difference between two adjacent voltage control modules 4041 may be an isolated voltage conversion device. For example, an isolation transformer with a fixed ratio between the number of turns of the primary winding and the number of turns of the secondary winding can be used as a voltage converter, and while eliminating the potential difference between two adjacent voltage control modules 4041, it can also The electrical isolation between two adjacent voltage control modules 4041 is realized to ensure the safe operation of the two voltage control modules 4041 . Or the voltage converter adopts a non-isolated voltage conversion device. For example, an existing H-bridge rectifier circuit is used as a voltage converter to eliminate the potential difference between two adjacent voltage control modules 4041 . During specific implementation, the structure of the voltage converter is not limited in this application.

In a specific application, since two adjacent voltage control modules 4041 perform signal transmission through a first voltage converter, the first voltage converter realizes bidirectional signal transmission. The signal transmission direction on the voltage converter component 4042 can be referred to as shown in FIG. 6 .

For example, when the first voltage control module 4041 and the second voltage control module 4041 are connected through a first voltage converter, the first voltage converter not only needs to send the signal of the first voltage control module 4041 to the second voltage control module The module 4041 also needs to send the signal of the second voltage control module 4041 to the first voltage control module 4041 . When both the first voltage control module 4041 and the second voltage control module 4041 have signals that need to be transmitted through the first voltage converter, the first voltage converter needs to transmit one signal before transmitting another signal to affect the voltage control module communication rate between them.

In order to speed up the transmission rate between two adjacent voltage control modules 4041 , two voltage converters may be used for signal transmission between two adjacent voltage control modules 4041 .

For example, as shown in FIG. 7 , in another embodiment provided by the present application, the voltage converter component 4042 includes multiple second voltage converters and multiple third voltage converters. A first signal transmission channel is formed by a plurality of second voltage converters and a plurality of third voltage converters.

In specific use, two adjacent voltage control modules are connected through a second voltage converter and a third voltage converter. Both the second voltage converter and the third voltage converter can eliminate the potential difference between two adjacent voltage control modules 4041 .

Specifically, the multiple second voltage converters are used to transmit the signal of the residual voltage control module 4041 to the target voltage control module 4041; the multiple third voltage converters are used to transmit the first signal to the residual voltage control module 4041.

It can be understood that, due to a second voltage converter and a third voltage converter connected between two adjacent voltage control modules 4041, the second voltage converter and the third voltage converter can eliminate two adjacent voltage control modules 4041 Potential difference between modules 4041. When two adjacent voltage control modules are in the same phase, the two voltage control modules 4041 can communicate directly, so as to realize the signal connection between the two adjacent voltage control modules 4041 . The two adjacent voltage control modules 4041 are connected to the two adjacent voltage modules connected in series. Since the potential difference between the two adjacent voltage modules connected in series is the lowest, a voltage converter with a transparent voltage conversion ratio can be selected as the second voltage converter. A voltage converter, when the voltage conversion ratio of the first voltage converter is lower, the cost and volume of the first voltage converter are smaller, which is beneficial to reduce the cost and volume of the voltage converter component 4042 .

In a specific application, two adjacent voltage control modules 4041 transmit signals through a second voltage converter and a third voltage converter, and the second voltage converter and the third voltage converter can respectively perform signal transmission in one direction. transmission. The signal transmission direction on the voltage converter component 4042 can be referred to as shown in FIG. 8 .

For example, when the first voltage control module 4041 and the second voltage control module 4041 are connected through a second voltage converter and a third voltage converter, the second voltage converter can convert the signal of the first voltage control module 4041 to After transmitting to the second voltage control module 4041 , the third voltage converter can transmit the signal of the second voltage control module 4041 to the first voltage control module 4041 . Therefore, when both the first voltage control module 4041 and the second voltage control module 4041 have signals that need to be transmitted through voltage converters, they can be transmitted through a voltage converter respectively without waiting, which speeds up the processing of two adjacent voltage control modules. The signaling rate between 4041.

In specific applications, multiple voltage control modules 4041 can transmit signals to the target voltage control module 4041 through connected voltage converters. On the voltage converter located between the set voltage control module 4041 and the target voltage control module 4041, it is not necessary to transmit the signal of the set voltage control module, but also need to send the signal between the set voltage control module 4041 and the target voltage control module 4041 Signals of other voltage control modules 4041. When the voltage converter fails, multiple voltage control modules 4041 may fail to communicate. In order to ensure safe communication between the voltage control modules 4041, each voltage control module 4041 can be configured with a signal transmission channel to the target voltage control module, and multiple signal transmission channels work independently without affecting each other.

For example, in another embodiment provided by the present application, the voltage converter component 4042 may be composed of multiple voltage converters, and the multiple voltage converters form multiple second signal transmission channels.

Wherein, each second signal transmission channel among the multiple second signal transmission channels corresponds to each voltage control module 4041 in the remaining voltage control module 4041 one by one, and each voltage control module 4041 in the remaining voltage control module 4041 passes The corresponding second signal transmission channel sends the signal to the target voltage control module 4041 , and receives the first signal through the corresponding second signal transmission channel 4041 .

In actual use, each second signal transmission channel is composed of at least one voltage converter, and the voltage converter is connected between every two adjacent voltage control modules between the set voltage control module and the target voltage control module , realizing the signal connection between every two adjacent voltage control modules.

In an example, two adjacent voltage control modules between the first set voltage control module and the target voltage control module are signal-connected through a voltage converter. Wherein, the first set voltage control module is one of the remaining voltage control modules.

In specific use, two adjacent voltage control modules between the first set voltage control module and the target voltage control module are connected through a fourth voltage converter. For example, as shown in FIG. 9, the first set voltage control module is the first voltage control module or the Mth voltage control module, and two adjacent voltages between the first set voltage control module and the target voltage control module are connected. The control module is signal-connected to a plurality of fourth voltage converters to form a second signal transmission channel corresponding to the first set voltage control module.

It should be understood that, as shown in FIG. 10, the fourth voltage converter connected to adjacent voltage control modules can realize two-wire signal transmission between two adjacent voltage control modules, which can save the number of communication devices between the voltage conversion modules. .

In another example, in order to increase the transmission rate of the voltage control module, two adjacent voltage control modules between the second set voltage control module and the target voltage control module are connected to each other through two voltage converters. Wherein, the second set voltage control module is one of the remaining voltage control modules.

In specific use, two adjacent voltage control modules between the second set voltage control module and the target voltage control module are connected to a fifth voltage converter and a sixth voltage converter; multiple fifth voltage converters are used for The signal of the second set voltage control module is transmitted to the target voltage control module; the plurality of sixth voltage converters are used to transmit the first signal to the second set voltage control module.

It should be understood that since each voltage control module performs signal transmission through its corresponding signal transmission channel, the signal transmission channel only transmits the large sending signal of the corresponding voltage control module. Therefore, when multiple voltage control modules simultaneously send signals to When the target voltage is used to control the module, parallel transmission can be realized, which speeds up the transmission rate. In addition, because each voltage control module transmits signals through corresponding signal transmission channels, and the voltage device conversion devices included in each signal transmission channel are different, therefore, it is possible to realize that the signal transmission of the voltage control modules does not affect each other. When a single voltage converter fails, it will only affect the transmission of the voltage control module corresponding to the signal transmission channel where the voltage converter is located, and other voltage control modules can work normally.

Optionally, the voltage control module corresponding to the signal transmission channel where the faulty voltage converter is located can perform signal transmission through the signal transmission channels corresponding to other voltage control modules.

It can be understood that the solid-state transformer 40 can be applied not only to a three-phase AC grid, but also to a single-phase, multi-phase grid or load. Wherein, the application scenario of the solid-state transformer 10 is not limited in this application.

Based on the same inventive concept, an embodiment of the present application also provides a power supply system, which may include a cabinet and the aforementioned solid-state transformer 400, and the solid-state transformer 400 is arranged in the cabinet.

In an example, the facility includes a first cabinet, a second cabinet, and a third cabinet. Wherein, the first cabinet is used for placing the medium-voltage conversion circuit of the solid-state transformer and for connecting with the medium-voltage power grid. The second cabinet is used to place the high-frequency transformer, and the third cabinet is used to place the low-voltage conversion circuit of the solid-state transformer and connect it to the load equipment. Among them, the medium-voltage power grid can be a charging pile or a medium-voltage power grid.

Wherein, the solid-state transformer 10 also includes a conductive shell, which can be connected to the cabinet, or the conductive shell can also be directly grounded to meet the safety requirements of the solid-state transformer 10 .

Based on the same inventive concept, the embodiment of the present application also provides a data center, including a plurality of load devices and a solid-state transformer 10 . The load equipment can be connected to the grid through the solid state transformer 10 so as to receive the electric energy transmitted on the medium voltage grid 01 .

Wherein, multiple voltage modules of the solid-state transformer 10 are connected to the medium-voltage grid 01 in series. On the load side, multiple load devices are connected in parallel with the low-voltage conversion circuit in the solid-state transformer, that is, the solid-state transformer 11 is connected in series on the input side and in parallel on the output side.

It can be understood that the medium-voltage grid can transmit three-phase alternating current, and can also transmit single-phase or multi-phase alternating current.

The above is only the specific implementation of the application, but the scope of protection of the application is not limited thereto. Anyone familiar with the technical field can easily think of changes or replacements within the technical scope disclosed in the application, and should cover Within the protection scope of this application.

Claims

A solid-state transformer, characterized in that the solid-state transformer includes a medium-voltage conversion circuit and a low-voltage conversion circuit connected to each other, the medium-voltage conversion circuit includes M voltage modules connected in series, and the solid-state transformer also includes: a first control circuit connected to the medium voltage conversion circuit and a second control circuit connected to the low voltage conversion circuit;

The first control circuit includes M voltage control modules and voltage converter components, one of the M voltage control modules is a target voltage control module, and the remaining voltage control modules are the M voltage control modules except the A voltage control module outside the target voltage control module, the voltage converter assembly is used to connect signals between every two adjacent voltage control modules, so as to transmit the signals of the remaining voltage control modules to the target voltage control module, wherein , M is an integer greater than 1;

The second control circuit is coupled to the target voltage control module, and the second control circuit is used to obtain the signal of each of the voltage control modules through the target voltage control module, and to operate the low-voltage conversion circuit including the A first signal of information is output to each of said voltage control modules via said voltage converter assembly.
The solid-state transformer according to claim 1, wherein a main transmission channel is connected between the target voltage control module and the second control circuit;

The main transmission channel includes: a first optical fiber transmission line and a second optical fiber transmission line;

The first optical fiber transmission line is used to transmit the signals of the M voltage control modules to the second control circuit;

The second optical fiber transmission line is used to transmit the first signal to the target voltage control module.
The solid-state transformer according to claim 1, wherein an auxiliary transmission channel is connected between the target voltage control module and the second control circuit;

The auxiliary transmission channel includes: a third optical fiber transmission line and a fourth optical fiber transmission line;

The third optical fiber transmission line is used to transmit the signals of the M voltage control modules to the second control circuit when the main transmission channel fails;

The fourth optical fiber transmission line is used to transmit the first signal to the target voltage control module when the main transmission channel fails.
The solid-state transformer according to claim 2 or 3, wherein the target voltage control module comprises: a controller and an optical module:

The optical module is connected to the optical fiber transmission line;

The controller is respectively connected with the optical module and the voltage converter assembly.
The solid-state transformer according to claim 1, wherein the voltage converter assembly forms a first signal transmission channel;

The first signal transmission channel is used to transmit the signal of the residual voltage control module to the target voltage control module, and transmit the first signal to the residual voltage control module.
The solid-state transformer according to claim 5, wherein two adjacent voltage control modules are connected through a first voltage converter, and a plurality of first voltage converters constitute the first signal transmission channel.
The solid-state transformer according to claim 5, wherein two adjacent voltage control modules are connected through a second voltage converter and a third voltage converter;

A plurality of second voltage converters are used to transmit signals from the remaining voltage control module to the target voltage control module;

A plurality of third voltage converters are used to transmit the first signal to the residual voltage control module.
The solid-state transformer according to claim 1, wherein the voltage converter assembly forms a plurality of second signal transmission channels;

Each second signal transmission channel corresponds to each voltage control module in the residual voltage control module, and each voltage control module in the residual voltage control module transmits a signal to the corresponding second signal transmission channel. The target voltage control module, and receive the first signal through the corresponding second signal transmission channel.
The solid-state transformer according to claim 8, wherein two adjacent voltage control modules between the first set voltage control module and the target voltage control module are connected through a fourth voltage converter; the first setting The constant voltage control module is one of the residual voltage control modules;

A plurality of fourth voltage converters constitute a second signal transmission channel corresponding to the first set voltage control module.
The solid-state transformer according to claim 8, wherein two adjacent voltage control modules between the second set voltage control module and the target voltage control module pass through a fifth voltage converter and a sixth voltage converter connected; the second set voltage control module is one of the remaining voltage control modules;

A plurality of fifth voltage converters are used to transmit the signal of the second set voltage control module to the target voltage control module;

A plurality of sixth voltage converters are used to transmit the first signal to the second set voltage control module.
A power supply device, characterized by comprising a cabinet and the solid-state transformer according to any one of claims 1 to 10, the solid-state transformer being arranged in the cabinet.
A data center, characterized in that it includes load equipment, and also includes the power supply equipment according to claim 11;

Wherein, the medium-voltage conversion circuit is used to connect to the power grid, and the low-voltage conversion circuit is connected to the load device.