Energy storage converter and energy storage control system

Abstract

The utility model discloses an energy storage converter and an energy storage control system, and relates to the field of energy storage. In the scheme, all energy storage converters are connected together through a signal bus, and information interaction among the energy storage converters is carried out; the switch module selects to connect the communication end of the switch module with the input end or the output end of the switch module according to the mode of the energy storage converter so as to output or access a signal in a corresponding mode; that is, when the energy storage converter is the main energy storage converter, the controller sends signals to other slave energy storage converters through the switch module and the signal bus, otherwise, when the energy storage converter is the slave energy storage converter, the controller controls the converter circuit to carry out conversion according to the signals received by the switch module from the signal bus. According to the scheme, when the main energy storage converter breaks down, the wiring condition of the other energy storage converters does not need to be modified, and the field operation and maintenance difficulty is greatly reduced.

Description

Technical Field

[0001] This utility model relates to the field of energy storage, and in particular to an energy storage converter and an energy storage control system. Background Technology

[0002] With the development of the energy storage field, energy storage power station systems composed of multiple power conversion systems (PCS) are becoming increasingly important. To ensure the coordinated operation of all power conversion systems in an energy storage power station system, traditional solutions involve configuring multiple power conversion systems into a master-slave configuration. The master power conversion system's signal output is connected to the first slave power conversion system's signal input, and the first slave power conversion system's signal input is connected to the second slave power conversion system, and so on in series. The master power conversion system only outputs signals, while the slave power conversion systems only receive signals. Figure 1 As shown, when the main energy storage converter - energy storage converter 1 fails, one of the slave energy storage converters needs to be set as the main energy storage converter. This requires modifying the wiring of each energy storage converter, increasing the difficulty of on-site operation and maintenance. Utility Model Content

[0003] The purpose of this utility model is to provide an energy storage converter and an energy storage control system. In this solution, when the main energy storage converter fails, there is no need to modify the wiring of the other energy storage converters, which greatly reduces the difficulty of on-site operation and maintenance.

[0004] To solve the above-mentioned technical problems, this utility model provides an energy storage converter, comprising:

[0005] A converter circuit, wherein the control terminal of the converter circuit is connected to the first control output terminal of the controller to perform power conversion based on the control of the controller;

[0006] The controller has a signal receiving end that receives a mode signal, a communication output end that is connected to the input end of the switch module, a communication input end that is connected to the output end of the switch module, and a second control output end that is connected to the control end of the switch module.

[0007] The switching module has a communication terminal connected to a signal bus. The communication terminal is used to connect to the input terminal of the switching module when the energy storage converter is a master energy storage converter, and to connect to the output terminal of the switching module when the energy storage module is a slave energy storage converter.

[0008] The signal bus is also connected to the switching modules in other energy storage converters.

[0009] Optionally, the switching module is a single-pole double-throw (SPD) switch. The moving contact of the SPD switch is the communication terminal of the switching module, the first stationary contact of the SPD switch is the output terminal of the switching module, the second stationary contact of the SPD switch is the input terminal of the switching module, and the control terminal of the SPD switch is the control terminal of the switching module. Therefore, the moving contact is used to connect with the second stationary contact when the energy storage converter is the main energy storage converter, and to connect with the first stationary contact when the energy storage module is the slave energy storage converter.

[0010] Optional, also includes:

[0011] A dual-channel signal isolator, wherein the first input terminal of the dual-channel signal isolator is connected to the communication output terminal of the controller, the second input terminal is connected to the output terminal of the switch module, the first output terminal is connected to the communication input terminal of the controller, and the second output terminal is connected to the input terminal of the switch module.

[0012] Optionally, the dual-channel signal isolator is a digital isolator, wherein the INA pin of the digital isolator is connected to the communication output terminal of the controller, the OUTA pin is connected to the output terminal of the switch module, the OUTB pin is connected to the communication input terminal of the controller, and the INB pin is connected to the input terminal of the switch module.

[0013] Optional, also includes:

[0014] A single-channel signal isolator, wherein the input terminal of the single-channel signal isolator is connected to the second control output terminal of the controller, and the output terminal is connected to the control terminal of the switch module.

[0015] Optionally, the single-channel signal isolator includes: an optocoupler, a first resistor, a second resistor, a third resistor, and a fourth resistor;

[0016] The anode of the light-emitting diode of the optocoupler is connected to the first end of the first resistor, the cathode of the light-emitting diode is connected to the first end of the second resistor, the base of the transistor of the optocoupler is connected to the light-emitting diode, the collector of the transistor is connected to the first end of the third resistor, the first end of the fourth resistor, and the emitter of the transistor, and the emitter of the transistor is connected to ground.

[0017] The second end of the first resistor is connected to the first power supply;

[0018] The second end of the second resistor is connected to the second control output terminal of the controller;

[0019] The second terminal of the third resistor is connected to the second power supply;

[0020] The second end of the fourth resistor is connected to the control terminal of the switching module.

[0021] Optionally, the single-channel signal isolator further includes:

[0022] A filtering device, wherein the first end of the filtering device is connected to the first end of the third resistor, the first end of the fourth resistor and the collector of the transistor respectively, and the second end is connected to the emitter of the transistor and the ground wire respectively.

[0023] Optional, also includes:

[0024] The display touch device is connected to the signal receiving end of the controller and is used to transmit and display the mode signal to the controller based on the control.

[0025] Optionally, the display touch device is a touch screen, which is connected to the signal receiving end of the controller in the energy storage controller, and is used to transmit and display the mode signal to the controller based on control.

[0026] To solve the above-mentioned technical problems, this utility model also provides an energy storage control system, including: N energy storage converters as described above and a signal bus, wherein each energy storage converter is connected to the signal bus.

[0027] The purpose of this invention is to provide an energy storage converter and an energy storage control system. In this solution, all energy storage converters are connected together via a signal bus for mutual information exchange. The switching module connects its communication terminal to either its input or output terminal based on the mode of the energy storage converter, enabling signal output or input in the corresponding mode. Specifically, when the energy storage converter is the master converter, the controller sends signals to the other slave converters via the switching module and the signal bus. Conversely, when the energy storage converter is a slave converter, the controller controls the converter circuit to perform conversion based on the signals received from the signal bus by the switching module. In this solution, when the master energy storage converter fails, there is no need to modify the wiring of the other energy storage converters, significantly reducing the difficulty of on-site maintenance. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0029] Figure 1 A schematic diagram of the connection between energy storage converters in the prior art is provided for this utility model;

[0030] Figure 2 A schematic diagram of the structure of an energy storage converter provided by this utility model;

[0031] Figure 3 A new connection diagram between energy storage converters provided by this utility model;

[0032] Figure 4 A schematic diagram of the structure of an energy storage converter controller provided by this utility model;

[0033] Figure 5 A schematic diagram of another energy storage converter provided by this utility model. Detailed Implementation

[0034] The core of this utility model is to provide an energy storage converter and an energy storage control system. In this solution, when the main energy storage converter fails, there is no need to modify the wiring of the other energy storage converters, which greatly reduces the difficulty of on-site operation and maintenance.

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0036] Please refer to Figure 2 , Figure 2 A schematic diagram of an energy storage converter provided by this utility model. The energy storage converter includes:

[0037] Converter circuit 1, the control terminal of converter circuit 1 is connected to the first control output terminal of controller 2, so as to perform conversion based on the control of controller 2;

[0038] Controller 2 has a signal receiving end that receives a mode signal, a communication output end that is connected to the input end of switch module 3, a communication input end that is connected to the output end of switch module 3, and a second control output end that is connected to the control end of switch module 3.

[0039] Switching module 3 has a communication terminal connected to the signal bus. The communication terminal is used to connect to the input terminal of switching module 3 when the energy storage converter is the main energy storage converter, and to connect to the output terminal of switching module 3 when the energy storage module is the slave energy storage converter.

[0040] The signal bus is also connected to the switching module 3 in other energy storage converters.

[0041] In this invention, considering that in the existing technology, each energy storage converter is wired in a one-master-multiple-slave configuration, the wiring of the signal output and signal input terminals of the energy storage converter needs to be differentiated. When the master energy storage converter fails, it is necessary to select a master energy storage converter from the other slave energy storage converters and rewire it, greatly increasing the difficulty of on-site operation and maintenance. Therefore, this solution adjusts the structure of the energy storage converter to address the wiring problem in the existing technology by adding a switch module 3. When the energy storage converter is the master energy storage converter... When the communication terminal of switch module 3 is connected to the input terminal of switch module 3, controller 2 can transmit signals to the signal bus through switch module 3. Conversely, when the energy storage converter is a slave energy storage converter, the communication terminal of switch module 3 is connected to the output terminal of switch module 3, and the signal can be transmitted to controller 2 through the signal bus and switch module 3. Controller 2 will control the current conversion of converter circuit 1 according to the signal. Therefore, when the main energy storage converter fails, there is no need to modify the wiring of the other energy storage converters, which greatly reduces the difficulty of on-site operation and maintenance.

[0042] It should be noted that this solution solves the problem of synchronous signal connection for multiple PCS in parallel operation, enabling multiple PCS to be connected in parallel with a single line (single signal bus), such as... Figure 3 As shown, the simplified field wiring allows for easy restoration of operation when a PCS fails, without requiring wiring modifications. The master / slave mode can be reconfigured via software (e.g., reconfiguring master / slave mode on the screen), eliminating the need for rewiring (traditional solutions connect the master to the synchronous signal output and the slave to the master's synchronous input; without wiring modifications, the slave cannot be configured as a master, or there is repetitive wiring, increasing the difficulty of field maintenance). The single-bus design simplifies field wiring, enabling one master and multiple slaves through software settings, with arbitrary dynamic configuration and no wiring modifications required.

[0043] This embodiment provides an energy storage converter. In this scheme, all energy storage converters are connected together via a signal bus for mutual information exchange. The switching module 3 connects its communication terminal to its input or output terminal based on the mode of the energy storage converter, enabling signal output or input in the corresponding mode. Specifically, when the energy storage converter is the master converter, the controller 2 sends signals to the other slave converters via the switching module 3 and the signal bus. Conversely, when the energy storage converter is a slave converter, the controller 2 controls the converter circuit 1 to perform conversion based on the signals received from the signal bus by the switching module 3. In this scheme, when the master energy storage converter fails, there is no need to modify the wiring of the other energy storage converters, greatly reducing the difficulty of on-site maintenance.

[0044] Based on the above embodiments:

[0045] As an optional embodiment, the switch module 3 is a single-pole double-throw switch. The moving contact of the single-pole double-throw switch is the communication terminal of the switch module 3, the first stationary contact of the single-pole double-throw switch is the output terminal of the switch module 3, the second stationary contact of the single-pole double-throw switch is the input terminal of the switch module 3, and the control terminal of the single-pole double-throw switch is the control terminal of the switch module 3. Therefore, the moving contact is used to connect with the second stationary contact when the energy storage converter is the main energy storage converter; and to connect with the first stationary contact when the energy storage module is the slave energy storage converter.

[0046] In this invention, considering that the essential function of the switch module 3 is to switch the connection between its communication terminal and its input terminal or its output terminal, a single-pole double-throw (SPD) switch is used for the switch module 3. The moving contact of the SPD switch is the communication terminal of the switch module 3, the first stationary contact is the output terminal of the switch module 3, and the second stationary contact is the input terminal of the switch module 3. The SPD switch switches the stationary contact connected to the moving contact according to the mode of the energy storage converter, ensuring the integrity of the solution. Furthermore, the SPD switch also has advantages such as small size and low cost.

[0047] As an optional embodiment, it also includes:

[0048] A dual-channel signal isolator is provided. The first input terminal of the dual-channel signal isolator is connected to the communication output terminal of the controller 2, and the second input terminal is connected to the output terminal of the switch module 3. The first output terminal is connected to the communication input terminal of the controller 2, and the second output terminal is connected to the input terminal of the switch module 3.

[0049] In this invention, considering the different operating modes of the energy storage converter—that is, when the energy storage converter is the master energy storage converter or the slave energy storage converter—the energy storage converter needs to transmit or receive signals. Therefore, there are two signal transmission channels. One signal channel consists of the controller 2, the input terminal of the switch module 3, the communication terminal of the switch module 3, and the signal bus. The other signal channel consists of the signal bus, the communication terminal of the switch module 3, the output terminal of the switch module 3, and the controller 2. Considering that the two signals are transmitted through different channels, this solution sets up a dual-channel signal isolator to isolate the reception and transmission of the two signals, ensuring the stability and accuracy of signal transmission.

[0050] As an optional embodiment, the dual-channel signal isolator is a digital isolator. The INA pin of the digital isolator is connected to the communication output terminal of the controller 2, the OUTA pin is connected to the output terminal of the switch module 3, the OUTB pin is connected to the communication input terminal of the controller 2, and the INB pin is connected to the input terminal of the switch module 3.

[0051] In this invention, considering that digital isolators have a high common-mode transient immunity, can effectively suppress carrier signals, have high electromagnetic interference immunity, small size, fast transmission speed, low power consumption, high ease of use and reliability, high precision (typically 0.01%), fast response speed (typically at the microsecond level), and high stability, thus improving the stability and reliability of the output signal, this solution selects a digital isolator as the dual-channel signal isolator.

[0052] As an optional embodiment, it also includes:

[0053] A single-channel signal isolator is connected to the second control output of controller 2, and its output is connected to the control terminal of switch module 3.

[0054] In this invention, considering that the controller 2 needs to control the switching module 3 according to the mode of the energy storage converter (i.e., the controller 2 needs to control the switching module 3 as a main energy storage converter or a slave energy storage converter), the controller 2 needs to transmit control signals to the control terminal of the switching module 3. In order to ensure that the communication terminal of the switching module 3 is correctly connected to the input or output terminal, the accuracy of the control signal during transmission must be guaranteed. Therefore, this solution adds a single-channel signal isolator between the second control output terminal of the controller 2 and the control terminal of the switching module 3 to isolate the interference received by the control signal sent by the controller 2 to the switching module 3 during transmission, thereby improving the stability and accuracy of signal transmission and thus improving the accuracy of the solution.

[0055] As an optional embodiment, a single-channel signal isolator includes: an optocoupler, a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4;

[0056] The anode of the light-emitting diode of the optocoupler is connected to the first end of the first resistor R1, the cathode of the light-emitting diode is connected to the first end of the second resistor R2, the base of the transistor of the optocoupler is connected to the light-emitting diode, the collector of the transistor is connected to the first end of the third resistor R3, the first end of the fourth resistor R4, and the emitter of the transistor, and the emitter of the transistor is connected to ground.

[0057] The second terminal of the first resistor R1 is connected to the first power supply V1;

[0058] The second end of the second resistor R2 is connected to the second control output terminal of the controller 2;

[0059] The second terminal of the third resistor R3 is connected to the second power supply V2;

[0060] The second end of the fourth resistor R4 is connected to the control terminal of the switch module 3.

[0061] In this invention, considering that the optocoupler can ensure unidirectional signal transmission, the input and output ends are completely electrically isolated, the output signal has no effect on the input end, and the anti-interference capability is strong; in addition, the optocoupler has a strong common-mode rejection capability; furthermore, the optocoupler also has the advantages of stable operation, no contacts, long service life, and high transmission efficiency. Moreover, in order to avoid overcurrent in the circuit, this solution adds matching first resistor R1, second resistor R2, third resistor R3, and fourth resistor R4 on the basis of the optocoupler to play a current limiting role, ensuring the stability and accuracy of unidirectional transmission of control signals.

[0062] It should be noted that the energy storage converter includes a PCS controller (energy storage converter controller) and converter circuit 1. A schematic diagram showing multiple energy storage converter controllers connected in parallel on the signal bus is shown below. Figure 4 As shown, each PCS controller includes: controller 2 (controller 2 can be a CPU (Central Processing Unit) or other control device), digital isolator, optocoupler, and switch module 3. Controller 2, upon receiving a master mode command, enters master mode. In master mode, controller 2 sends a high-level CPU signal (control signal) to the corresponding switch module 3 via the optocoupler, causing the corresponding contact of switch module 3 to close. Controller 2 outputs a controller 2 signal, which is isolated by the digital isolator and then output to switch module 3, which in turn outputs to the signal bus. Controller 2, upon receiving a slave mode command, enters slave mode. In slave mode, controller 2 sends a low-level controller 2 control signal to the corresponding switch module 3 via the optocoupler, causing the corresponding contact of switch module 3 to close. It receives controller 2 signals on the signal bus and, after isolation by the digital isolator, inputs controller 2 signals to slave controller 2. This allows the energy storage converter to switch between master and slave modes without rewiring.

[0063] As an optional embodiment, the single-channel signal isolator further includes:

[0064] The filter device has its first end connected to the first end of the third resistor R3, the first end of the fourth resistor R4, and the collector of the transistor, respectively, and its second end connected to the emitter of the transistor and the ground wire, respectively.

[0065] In this utility model, such as Figure 5As shown, although a single-phase signal isolator can ensure unidirectional transmission of control signals and achieve complete electrical isolation between the input and output ends, thus improving the anti-interference capability during control signal transmission, the control signal is still easily affected by environmental factors and may fluctuate during transmission. Therefore, in order to filter out interference signals received during control signal transmission, this solution adds a filtering device to filter out interference signals as much as possible, so as to ensure the stability and accuracy of the control signal during transmission.

[0066] As an optional embodiment, it also includes:

[0067] The display touch device is connected to the signal receiving end of the controller 2 and is used to transmit and display mode signals to the controller 2 based on control.

[0068] In this invention, since the energy storage converter determines whether it is a master or slave energy storage converter based on the mode signal received by the controller 2, this solution takes into account the susceptibility of the energy storage converter to failure during use. Therefore, a display energy storage device is needed to control the transmission of the mode signal. This allows the user to change the mode of the energy storage converter according to their needs. For example, when a master energy storage converter fails, the user can promptly control another slave energy storage converter to become the master energy storage converter via the display touch device. This ensures the stability of the operation of the remaining slave energy storage converters and avoids safety failures caused by the inability to adjust the mode of the energy storage converter in a timely manner, thus improving the controllability and safety of the solution.

[0069] As an optional embodiment, the display touch device is a touch screen, which is connected to the signal receiving end of the controller 2 in the energy storage controller 2, and is used to transmit and display mode signals to the controller 2 based on control.

[0070] In this invention, considering that touch screens have advantages such as being robust and durable, small in size, highly portable, and displaying clear images, this solution selects a touch screen as the display and control device. This can reduce the size of the energy storage converter and allow for timely adjustment of the energy storage converter's mode, thereby improving the controllability and safety of the solution.

[0071] This utility model also provides an embodiment of an energy storage control system, including: N energy storage converters as described above and a signal bus, wherein each energy storage converter is connected to the signal bus.

[0072] The energy storage control system provided in this embodiment corresponds to the energy storage converter described above, and therefore has the same beneficial effects as the energy storage converter described above. Therefore, for the embodiment of the energy storage control system, please refer to the description of the embodiment of the energy storage converter, which will not be repeated here.

[0073] It should be noted that, in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0074] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An energy storage converter, characterized in that, include: A converter circuit, wherein the control terminal of the converter circuit is connected to the first control output terminal of the controller to perform power conversion based on the control of the controller; The controller has a signal receiving end that receives a mode signal, a communication output end that is connected to the input end of the switch module, a communication input end that is connected to the output end of the switch module, and a second control output end that is connected to the control end of the switch module. The switching module has a communication terminal connected to a signal bus. The communication terminal is used to connect to the input terminal of the switching module when the energy storage converter is a master energy storage converter, and to connect to the output terminal of the switching module when the energy storage converter is a slave energy storage converter. The signal bus is also connected to the switching modules in other energy storage converters.

2. The energy storage converter as described in claim 1, characterized in that, The switching module is a single-pole double-throw (SPD) switch. The moving contact of the SPD switch is the communication terminal of the switching module, the first stationary contact of the SPD switch is the output terminal of the switching module, the second stationary contact of the SPD switch is the input terminal of the switching module, and the control terminal of the SPD switch is the control terminal of the switching module. Therefore, the moving contact is used to connect with the second stationary contact when the energy storage converter is a master energy storage converter, and to connect with the first stationary contact when the energy storage converter is a slave energy storage converter.

3. The energy storage converter as described in claim 1, characterized in that, Also includes: A dual-channel signal isolator, wherein the first input terminal of the dual-channel signal isolator is connected to the communication output terminal of the controller, the second input terminal is connected to the output terminal of the switch module, the first output terminal is connected to the communication input terminal of the controller, and the second output terminal is connected to the input terminal of the switch module.

4. The energy storage converter as described in claim 3, characterized in that, The dual-channel signal isolator is a digital isolator. The INA pin of the digital isolator is connected to the communication output terminal of the controller, the OUTA pin is connected to the output terminal of the switch module, the OUTB pin is connected to the communication input terminal of the controller, and the INB pin is connected to the input terminal of the switch module.

5. The energy storage converter as described in claim 1, characterized in that, Also includes: A single-channel signal isolator, wherein the input terminal of the single-channel signal isolator is connected to the second control output terminal of the controller, and the output terminal is connected to the control terminal of the switch module.

6. The energy storage converter as described in claim 5, characterized in that, The single-channel signal isolator includes: an optocoupler, a first resistor, a second resistor, a third resistor, and a fourth resistor; The anode of the light-emitting diode of the optocoupler is connected to the first end of the first resistor, the cathode of the light-emitting diode is connected to the first end of the second resistor, the base of the transistor of the optocoupler is connected to the light-emitting diode, the collector of the transistor is connected to the first end of the third resistor, the first end of the fourth resistor, and the emitter of the transistor, and the emitter of the transistor is connected to ground. The second end of the first resistor is connected to the first power supply; The second end of the second resistor is connected to the second control output terminal of the controller; The second terminal of the third resistor is connected to the second power supply; The second end of the fourth resistor is connected to the control terminal of the switching module.

7. The energy storage converter as described in claim 6, characterized in that, The single-channel signal isolator also includes: A filtering device, wherein the first end of the filtering device is connected to the first end of the third resistor, the first end of the fourth resistor and the collector of the transistor respectively, and the second end is connected to the emitter of the transistor and the ground wire respectively.

8. The energy storage converter as described in any one of claims 1 to 7, characterized in that, Also includes: The display touch device is connected to the signal receiving end of the controller and is used to transmit and display the mode signal to the controller based on the control.

9. The energy storage converter as described in claim 8, characterized in that, The display touch device is a touch screen, which is connected to the signal receiving end of the controller and is used to transmit and display the mode signal to the controller based on the control.

10. An energy storage control system, characterized in that, include: N energy storage converters and signal buses as described in any one of claims 1 to 9, wherein each of the energy storage converters is connected to the signal bus.

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