A parallel device, power converter, and parallel system
By using a parallel connection device and control board to connect multiple power converters in parallel and synchronize their parameters, the problem of low power output per unit is solved, achieving high power output and resource conservation.
Patent Information
- Application Number
- CN202410374364.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-29
- Publication Date
- 2026-01-02
- Estimated Expiration
- 2044-03-29
AI Technical Summary
Existing power converters have low power output when running in stand-alone mode, making them difficult to apply to high-power scenarios. Furthermore, their complex structure leads to excessive resource consumption for development and modification.
Multiple power converters are connected in parallel and their parameters are synchronized through a parallel device and control board. The parallel control board sends parameter synchronization setting frames to make the parameters of multiple converters consistent, thus forming a high-power output.
Without requiring any new development or modification to the converter, power capacity expansion was achieved, saving development resources. After parallel operation, the parameters are consistent and can quickly respond to customer needs.
Smart Images
Figure CN118353237B_ABST
Abstract
Description
TECHNICAL FIELD
[0001] Embodiments of the present application relate to the technical field of parallel system, and in particular to a parallel device, a power converter and a parallel system. BACKGROUND
[0002] A power converter is an electronic device that converts one type of current to another, including DC power conversion and AC power conversion, etc. The power converter can be an inverter, a rectifier, a charger, an uninterruptible power supply, etc.
[0003] For a power converter that can only operate in single mode, the power of the power converter in single mode is small, and the power converter is difficult to apply to a high-power working scenario. When a high-power working scenario is needed, the structure of the power converter needs to be developed and reformed to improve the single power of the power converter. However, the structure of the power converter is relatively complex, and in order to improve the single power of the power converter, too much development resources are consumed in the development and reform. SUMMARY
[0004] Embodiments of the present application provide a parallel device, a power converter and a parallel system, without the need for new development and reform of the power converter, effectively saving development resources.
[0005] Embodiments of the present application provide a parallel device,
[0006] The parallel device is provided with a parallel interface, and the parallel interface is used for parallel connection of multiple power converters through the parallel interface.
[0007] The parallel device includes a parallel control board, and the parallel control board is provided with a communication interface. The parallel control board and the multiple power converters are in parallel communication through the communication interface.
[0008] The parallel control board is configured to acquire power converter parameters to be synchronized, send a parameter synchronization setting frame to the multiple power converters based on parallel communication, and include the power converter parameters in the parameter synchronization setting frame, so that the multiple power converters synchronize the power converter parameters based on the parameter synchronization setting frame.
[0009] Further, the parallel device further includes a data collector configured to collect power converter parameters to be synchronized set by a client.
[0010] The acquisition of the power converter parameters to be synchronized includes:
[0011] The parallel control board receives the power converter parameters to be synchronized transmitted by the data collector.
[0012] Further, the sending of the parameter synchronization setting frame to the plurality of power converters based on the parallel communication comprises:
[0013] If the state machine of the parallel control panel is in the parameter synchronization state, and the parallel control panel successfully communicates with any of the plurality of power converters, the parallel control panel sends a parameter synchronization setting frame to the plurality of power converters based on a preset sending timing until a parameter synchronization completion flag sent by at least one of the plurality of power converters is received.
[0014] Further, the power converter parameter is a plurality of power converter parameters.
[0015] The sending of the parameter synchronization setting frame to the plurality of power converters based on the preset sending timing comprises:
[0016] The parallel control panel sends a frame of parameter synchronization setting frame to the plurality of power converters based on a preset interval duration until the plurality of power converter parameters are sent to the plurality of power converters; wherein a frame of parameter synchronization setting frame contains any of the plurality of power converter parameters.
[0017] Further, the sending of the parameter synchronization setting frame to the plurality of power converters based on the parallel communication comprises:
[0018] After the parallel control panel receives the parameter synchronization request sent by the power converter, the parallel control panel repeatedly sends a parameter synchronization setting frame to the plurality of power converters based on a preset sending timing, if the number of times of repeated sending of the parameter synchronization setting frame by the parallel control panel does not reach a preset number of times, and the parallel control panel receives a parameter synchronization request sent by another power converter, the number of times of repeated sending is cleared, and the parallel control panel repeatedly sends a parameter synchronization setting frame to the plurality of power converters based on a preset sending timing again.
[0019] If the number of times of repeated sending of the parameter synchronization setting frame by the parallel control panel reaches the preset number of times, the parallel control panel stops sending the parameter synchronization setting frame.
[0020] Further, the parallel control panel is further configured to, when the state machine of the parallel control panel is in the parameter synchronization state, start a parameter synchronization counter.
[0021] Based on the parameter synchronization counter, the parameter synchronization flag fed back by the power converter received within a preset time duration is used to determine whether the parallel device completes parameter synchronization.
[0022] Further, the determination of whether the parallel device completes parameter synchronization based on the parameter synchronization counter and the parameter synchronization flag fed back by the power converter received within a preset time duration comprises:
[0023] If the parameter synchronization flag fed back by at least one of the plurality of power converters is received within the pre-designed time duration, it is determined that the parallel operation device completes parameter synchronization.
[0024] If the parameter synchronization flag fed back by the power converter is not received within the pre-designed time duration, it is determined that the parallel operation device does not complete parameter synchronization, a parameter asynchronization fault is reported, and the state machine of the parallel operation control board is adjusted to a fault state.
[0025] Further, the parallel operation device further comprises a data collector configured to collect the parameter asynchronization fault reported by the power converter and the parallel operation control board, and transmit the collected fault information to a client.
[0026] The embodiment of the application further provides a power converter in parallel operation by using a parallel operation device, wherein the parallel operation device is the parallel operation device described above.
[0027] The power converter is configured to, when a parameter synchronization setting frame is received, update the parameters of the power converter itself based on the power converter parameters in the parameter synchronization setting frame.
[0028] If the parameters of the power converter itself are all updated, a parameter synchronization completion flag is fed back to the parallel operation control board of the parallel operation device.
[0029] If the parameters of the power converter itself are not updated after a pre-set time duration, a parameter asynchronization fault is reported, and the state machine of the power converter is adjusted to a fault state.
[0030] Further, the power converter is further configured to, when the state machine of the power converter is in a parameter synchronization state and the power converter successfully communicates with the parallel operation control board, send a parameter synchronization request to the parallel operation control board.
[0031] The embodiment of the application further provides a parallel operation system, comprising the parallel operation device and the plurality of power converters.
[0032] From the above technical solutions, it can be seen that the embodiment of the application has the following advantages:
[0033] In the embodiment of the present application, the parallel connection device is provided with a parallel connection interface, and the parallel connection interface is used for connecting multiple power converters in parallel through the parallel connection interface. The parallel connection device includes a parallel connection control board, and the parallel connection control board is provided with a communication interface. The parallel connection control board communicates with the multiple power converters through the communication interface. The parallel connection control board is used for obtaining power converter parameters to be synchronized, sending a parameter synchronization setting frame to the multiple power converters based on the parallel connection communication, and including the power converter parameters in the parameter synchronization setting frame, so that the multiple power converters synchronize the power converter parameters based on the parameter synchronization setting frame. The multiple power converters are connected in parallel through the parallel connection device, and the power converter parameters of the multiple power converters after parallel connection are synchronized. The multiple single-machine-mode power converters can be expanded in parallel to obtain larger output power, without the need for new development and modification of the power converters, thereby effectively saving development resources. BRIEF DESCRIPTION OF DRAWINGS
[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments described in the present application, and other drawings can also be obtained by those skilled in the art based on these drawings.
[0035] Figure 1 A schematic diagram of a parallel connection device disclosed in an embodiment of the present application;
[0036] Figure 2 A schematic diagram of a parallel connection system disclosed in an embodiment of the present application;
[0037] Figure 3 A sending timing diagram of a parameter synchronization setting frame disclosed in an embodiment of the present application;
[0038] Figure 4 A flowchart for judging parameter synchronization disclosed in an embodiment of the present application;
[0039] Figure 5 A parameter synchronization process diagram based on a parameter synchronization request disclosed in an embodiment of the present application. DETAILED DESCRIPTION
[0040] In order to make the personnel in the technical field better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely in the following with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.
[0041] In the description of the embodiments of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only intended to facilitate the description of the embodiments of the present application and simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.
[0042] In the description of the embodiments of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.
[0043] At present, for the power converter which can only run in single machine mode, the power of the single machine is small when the power converter runs in single machine mode, and the power converter is difficult to apply to a high-power working scene. When a high-power scene is needed, the structure of the power converter needs to be developed and modified to improve the single machine power of the power converter. However, the structure of the power converter is relatively complex, and in order to improve the single machine power of the power converter, excessive development resources need to be consumed in the development and modification. The embodiments of the present application provide a parallel machine device, which does not need to be newly developed and modified for the power converter, and only needs to be simply modified for the single machine mode power converter, so that multiple parallel machine expansions can be realized, and development resources can be effectively saved. The parallel machine device provided in the embodiments of the present application is as shown in FIG. 1, and the specific process is as follows: Figure 1
[0044] In the embodiments of the present application, the parallel machine device is provided with a parallel machine interface, and the parallel machine interface is used for multiple power converters 101 to be connected in parallel through the parallel machine interface, that is, the output ends of the multiple power converters can be physically connected through the parallel machine interface provided by the parallel machine device. The power converter can be an inverter, a rectifier, and a power adapter, and the specific implementation is not limited here. The parallel machine device includes a parallel machine control board 102, and the parallel machine control board is provided with a communication interface. The parallel machine control board and the multiple power converters are connected in parallel communication through the communication interface. The communication interface can be a CAN bus interface or a serial interface, and the specific implementation is not limited here. The parallel machine control board can be connected in parallel communication with the multiple power converters through the CAN bus, or connected in parallel communication through the serial communication (such as RS232), and the specific implementation is not limited here. It can be understood that the parallel machine device and the multiple power converters can form a parallel machine system.
[0045] The parallel operation control board is configured to obtain power converter parameters to be synchronized, which can be rated grid voltage, over-frequency protection value, over-frequency protection time, etc. The power converter parameters to be synchronized can be read from the pre-stored power converter parameters in the parallel operation control board or can be input by a user. The parallel operation control board controls multiple power converters through parallel operation communication. After obtaining the power converter parameters to be synchronized, the parallel operation control board sends a parameter synchronization setting frame to the multiple power converters based on the parallel operation communication. The parameter synchronization setting frame contains the power converter parameters, so that the multiple power converters synchronize the power converter parameters based on the parameter synchronization setting frame. It can be understood that when the power converter parameters to be synchronized are multiple parameters, multiple parameter synchronization setting frames can be sent to the multiple power converters. Each parameter synchronization setting frame contains one parameter, so that the multiple parameters are sent to the multiple power converters. It can be understood that the parallel operation control board can send the parameter synchronization setting frame to the multiple power converters based on the parallel operation communication during the startup or operation of the power converters. The multiple power converters can receive the same power converter parameters, so that the power converters of the multiple power converters are synchronized to the received power converter parameters, and the parameters of the multiple power converters are consistent. After the multiple power converters are connected in parallel and the parameters are consistent, the output power of the multiple power converters connected in parallel is the sum of the output powers of the multiple power converters. The output power of the power converters does not need to be developed and modified, and the output power can be increased.
[0046] In the embodiment, the parallel operation device is provided with a parallel operation interface, which is used for connecting multiple power converters in parallel. The parallel operation device includes a parallel operation control board, which is provided with a communication interface. The parallel operation control board communicates with the multiple power converters through the communication interface. The parallel operation control board is configured to obtain power converter parameters to be synchronized and send a parameter synchronization setting frame to the multiple power converters based on the parallel operation communication. The parameter synchronization setting frame contains the power converter parameters, so that the multiple power converters synchronize the power converter parameters based on the parameter synchronization setting frame. The multiple power converters are connected in parallel through the parallel operation device, and the power converter parameters of the multiple power converters connected in parallel are synchronized. The multiple power converters are connected in parallel to expand the capacity, and a larger output power is obtained. The output power of the power converters does not need to be developed and modified, and the development resources are effectively saved.
[0047] In an implementable mode, when multiple power converters are in parallel operation, the parameters of the multiple power converters need to be kept consistent; in the prior art, the parameters of each power converter are set one by one when the multiple power converters are started, and when the number of power converters is large, the parameters set when the multiple power converters are started may not be consistent; and when the power converters appear re-powering and other running phenomena in the running process of the multiple power converters, the parameters of the power converters may change, which easily leads to inconsistent parameters of the multiple power converters in the running process. In the embodiment of the present application, whether in parallel starting or in the running process of the multiple power converters, the parallel control board can send the power conversion parameters that need to be synchronized to the multiple power converters through the parameter synchronization setting frame, so that the parameters of the multiple power converters can be kept consistent in the parallel starting or running of the multiple power converters.
[0048] It can be understood that the parallel device needs to keep the parameters of the multiple power converters consistent, that is, the parameters of the multiple power converters are synchronized, and the parameter synchronization process of the parallel device will be described in detail below in combination with the parallel system of the parallel device. Figure 2
[0049] As shown in Figure 2 , the parallel device further comprises a data collector 103 (KC541), which can be a wired or wireless collector and is not limited here; the data collector 103 is used to collect the power converter parameters that need to be synchronized set by the client 104; wherein the data collector can be in communication connection with the client through a WIFI module or an RS485 module, and is not limited here; the client can be a cloud platform or an APP, and is not limited here; the parallel device can be a parallel box, and the parallel device can transmit the running information to the client through the data collector to realize man-machine interaction.
[0050] It can be understood that the power converter parameters in the parallel device can be displayed and set on the client, and the parameters set on the client, which involve the working mode, power control and system protection and other functions, need to be synchronized to the parallel control board and the power converter. The data collector can collect the power converter parameters that need to be synchronized set by the client, the data collector and the parallel control board are in communication connection with the client through a WIFI module or an RS485 module, and the data collector can send the collected power converter parameters that need to be synchronized to the parallel control board; the parallel control board receives the power converter parameters that need to be synchronized transmitted by the data collector, and sends the power converter parameters that need to be synchronized to the multiple power converters through parallel communication.
[0051] When the power converter is an inverter, the corresponding inverter parameters that need to be synchronized are shown in the following table:
[0052] Table 1: Summary of parameters that need to be synchronized
[0053]
[0054]
[0055]
[0056] A total of 63 inverter parameters to be synchronized, CID3 and CID4 represent the corresponding flag information of each inverter parameter in the parameter synchronization setting frame.
[0057] The application further provides a power converter running in parallel with the parallel device, and the parallel device is the parallel device described in the application; wherein, when the parameter synchronization setting frame is received, the power converter updates its own parameters based on the power converter parameters in the parameter synchronization setting frame; that is, after the power converter receives the parameter synchronization setting frame, it reads the power converter parameters in the parameter synchronization setting frame and compares them with the stored parameters corresponding to the power converter parameters in the power converter; if they are the same, no processing is performed; if they are not the same, the storage is triggered, and the power converter parameters in the parameter synchronization setting frame are updated to the stored parameters. In this embodiment, only the software control part of the existing power converter which can only run in single-machine mode needs to be simply modified to adapt to the parallel device to work in parallel mode, and the parallel connection of two or more power converters can be realized according to the needs, the power expansion is simple and flexible, and there is no need to redevelop high-power power converters, saving development resources and quickly responding to customer needs.
[0058] If the parameters of the power converter itself are all updated, that is, all the parameters to be synchronized are updated, the parameter synchronization completion flag is fed back to the parallel control board; wherein, the parameter synchronization completion flag in the running information frame can be set to 0xFF, and the running information frame is sent to the parallel control board. If the parameters of the power converter itself are not updated after a preset time, the parameter out-of-sync fault is reported, and the state machine of the power converter is adjusted to the fault state. That is, after the power converter is powered on, it will perform parameter synchronization detection, and when it is detected that the power converter parameters in the received parameter synchronization setting frame are inconsistent with the stored parameters, and the duration exceeds the preset time, the parameter out-of-sync fault is reported, and the state machine of the power converter is adjusted to the fault state; wherein, the preset time can be 5 seconds or 6 seconds, and the specific value is not limited here.
[0059] Further, the parallel control board of the parallel device can actively send parameter synchronization setting frames to the plurality of power converters. Specifically, if the state machine of the parallel control board is in the parameter synchronization state and the parallel control board successfully communicates with any power converter in the plurality of power converters (i.e., the communication is normal), the parallel control board sends parameter synchronization setting frames to the plurality of power converters based on a preset sending timing until a parameter synchronization completion flag sent by at least one power converter is received. It can be understood that before sending the parameter synchronization setting frame, the parallel control board can detect whether any power converter is in normal communication through the communication probe, and then send the parameter synchronization setting frame after determining that the communication is normal, so as to ensure that the power converter can receive the parameter synchronization setting frame. When the parameter synchronization completion flag of at least one power converter is received, it means that all power converters that need to be synchronized and successfully sent to the plurality of power converters, and the sending of the parameter synchronization setting frame is stopped. It can be understood that when the parallel control board sends the parameter synchronization setting frame, the parameter synchronization setting frame is broadcasted to the plurality of parallel power converters.
[0060] It can be understood that the power converter parameter is generally a plurality of power converter parameters, i.e., a plurality of parameters need to be synchronized. At this time, the parallel control board sends a frame of parameter synchronization setting frame to the plurality of power converters based on a preset interval time length until the plurality of power converter parameters are sent to the plurality of power converters; wherein a frame of parameter synchronization setting frame contains any power converter parameter in the plurality of power converter parameters. The preset interval time length is generally short, which can be 10 milliseconds or 15 milliseconds, and the specific value is not limited here. For example, Figure 3 As shown in FIG. 6, when the power converter parameters that need to be synchronized are 63 parameters, the parallel control board can send a frame of parameter synchronization setting frame every 10 milliseconds (ms), and 63 parameters are sequentially sent to complete a round.
[0061] It can be understood that when the state machine of the parallel control board is in the parameter synchronization state, the parallel control board can start a parameter synchronization counter to time, and when the timing reaches a preset timing length, the parallel control board can send a round of parameter synchronization setting frames to keep the plurality of power converters in parameter synchronization. The preset timing length can be 20 minutes or 30 minutes, and the specific value is not limited here.
[0062] Further, the parallel control board of the parallel device can also send a parameter synchronization setting frame to the power converter after receiving the parameter synchronization request sent by the power converter. Wherein, the power converter is further configured to send a parameter synchronization request to the parallel control board when the state machine of the power converter is in the parameter synchronization state and the power converter successfully communicates with the parallel control board; it can be understood that when the power converter needs to be powered on again due to external factors during normal operation of the parallel device, the parallel control board can send a parameter synchronization request for parameter synchronization. For example, Figure 5As shown, specifically, after the power converter (inverter) is powered on, the state machine of the power converter and the CAN communication (parallel communication) with the parallel control board can be detected. When the state machine of the power converter is in the parameter synchronization state and the CAN communication is normal, the module state bit of the running information frame can be set to the parameter synchronization state, and the running information frame (i.e. parameter synchronization request) is sent to the parallel control board through the parallel communication. After the parallel control board receives the parameter synchronization request, the parameter synchronization setting frame can be repeatedly sent to multiple power converters based on a preset sending timing, so that the power converter sending the parameter synchronization request receives the parameter synchronization setting frame to perform parameter synchronization, and whether there is a parameter out-of-sync fault is detected.
[0063] The process in which the parallel control board repeatedly sends the parameter synchronization setting frame to multiple power converters based on the preset sending timing is as described above, and will not be repeated here. The parameter synchronization setting frame repeatedly sent by the parallel control board after receiving the parameter synchronization request can be that, if the number of times of repeatedly sending the parameter synchronization setting frame by the parallel control board does not reach a preset number of times, and the parallel control board receives a parameter synchronization request sent by another power converter, the number of times of repetition is cleared, and the parameter synchronization setting frame is repeatedly sent to multiple power converters based on the preset sending timing. The preset number of times can be 3 or 4, and is not limited here. The other power converter is another power converter sending a parameter synchronization request. If the number of times of repeatedly sending the parameter synchronization setting frame reaches the preset number of times, the parallel control board stops sending the parameter synchronization setting frame. As shown in the figure, Figure 5 As shown, when the parallel control board is normally running, when receiving the parameter synchronization request of the inverter [i], it is determined that the state machine of the inverter [i] is in the parameter synchronization state, and the CAN communication between the inverter [i] and the parallel control board is normal. At this time, the parallel control board repeatedly sends the parameter synchronization setting frame. If the number of times of repeatedly sending the parameter synchronization setting frame (i.e. the number of rounds of sending timing) reaches 3, the sending of the parameter synchronization setting frame is stopped. If the number of times of repeatedly sending the parameter synchronization setting frame (i.e. the number of rounds of sending timing) does not reach 3, and another inverter (inverter [j]) sends a parameter synchronization request, the number of times of repetition (i.e. the number of rounds) is cleared, and the parameter synchronization setting frame is repeatedly sent.
[0064] Further, the parallel control board can also judge whether the parallel device completes parameter synchronization, that is, whether the parallel system composed of the parallel device and multiple power converters completes parameter synchronization. Specifically, the parallel control board is also used to start a parameter synchronization counter when the state machine of the parallel control board is in the parameter synchronization state. Within a preset time duration of the parameter synchronization counter, the parameter synchronization flag fed back by the power converter is received to determine whether the parallel device completes parameter synchronization. The preset time duration can be 10 seconds or 15 seconds, and is not limited here.
[0065] Specifically, if a parameter synchronization flag is received from at least one of the power converters within a preset timeout period, the parallel operation is considered to have completed parameter synchronization. If no parameter synchronization flag is received from a power converter within the preset timeout period, the parallel operation is considered to have failed to complete parameter synchronization, a parameter asynchrony fault is reported, and the state machine of the parallel operation control board is adjusted to a fault state. Figure 4 As shown, if the state machine of the parallel control board is in parameter synchronization state, the parameter synchronization counter is started; if it is not in parameter synchronization state, the parameter synchronization counter is reset to zero. If the parameters of all power converters (energy storage converters ESS) are synchronized, or if the parameter synchronization counter is within 10 seconds and the parameters of individual power converters are synchronized, then the parameter synchronization of the parallel device is determined to be complete. If the parameter synchronization counter is within 10 seconds and no individual power converters are synchronized, then the parameter synchronization of the parallel device is determined to be incomplete.
[0066] Furthermore, the data acquisition unit also connects to multiple power converters via connections such as RS485 communication. It is also used to collect parameter synchronization faults reported by the power converters and parallel control boards, and transmit the collected fault information to the client. When all power converters and parallel control boards in the parallel operation unit report parameter synchronization faults, the parallel operation unit cannot operate, requiring manual intervention. It is necessary to check whether there are faults in the parallel communication or in the power converters or parallel control boards.
[0067] This application also provides a parallel system, which includes the above-described parallel device and multiple power converters.
[0068] This application also provides a method for parallel operation of power converters, applied to a parallel operation device. The parallel operation device includes a parallel operation control board, which communicates with multiple power converters in parallel operation. The multiple power converters are connected in parallel through a parallel operation interface on the parallel operation device. The method includes:
[0069] The parallel control board is controlled to acquire the power converter parameters that need to be synchronized, and a parameter synchronization setting frame is sent to multiple power converters based on parallel communication. The parameter synchronization setting frame contains the power converter parameters, so that multiple power converters synchronize the power converter parameters based on the parameter synchronization setting frame.
[0070] This application also provides a computer-readable storage medium storing computer-executable instructions, characterized in that the computer-executable instructions are used to cause the computer to perform the method described above when run on a computer.
[0071] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the foregoing method embodiments, which will not be repeated here.
[0072] In several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of the units is only a logical function division, and actual implementation can have another division manner, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some interface, device or unit, and can be electrical, mechanical or other forms.
[0073] The units described as separate components can or can not be physically separated, and the components shown as units can or can not be physical units, that is, they can be located in one place, or can be distributed on a plurality of network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the embodiment scheme.
[0074] In addition, each functional unit in each embodiment of the present application can be integrated in one processing unit, or each unit can exist physically, or two or more units can be integrated in one unit. The integrated unit can be realized in the form of hardware or in the form of a software functional unit.
[0075] The integrated unit, if realized in the form of a software functional unit and sold or used as an independent product, can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the present application essentially or the part of the prior art that makes a contribution or the whole or part of the technical solutions can be embodied in the form of a software product, which is stored in a storage medium and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and various program code storage media.
Claims
1. A parallel device, characterized in that, a parallel interface is arranged on the parallel device, and the parallel interface is used for multiple power converters to be connected in parallel through the parallel interface; the parallel device comprises a parallel control board, and a communication interface is arranged on the parallel control board, and the parallel control board is connected in parallel with the multiple power converters through the communication interface; the parallel control board is configured to acquire power converter parameters to be synchronized, send a parameter synchronization setting frame to the multiple power converters based on parallel communication, the parameter synchronization setting frame containing the power converter parameters, so that the multiple power converters synchronize the power converter parameters based on the parameter synchronization setting frame; the sending of the parameter synchronization setting frame to the multiple power converters based on parallel communication comprises: if a state machine of the parallel control board is in a parameter synchronization state, and the parallel control board successfully communicates with any power converter of the multiple power converters, the parallel control board sends the parameter synchronization setting frame to the multiple power converters based on a preset sending timing, until a parameter synchronization completion flag sent by at least one power converter is received.
2. The apparatus of claim 1, wherein, the power converter parameters are multiple power converter parameters; the sending of the parameter synchronization setting frame to the multiple power converters based on the preset sending timing comprises: the parallel control board sends a frame of the parameter synchronization setting frame to the multiple power converters based on a preset interval time length, until the multiple power converter parameters are sent to the multiple power converters; wherein one frame of the parameter synchronization setting frame contains any power converter parameter of the multiple power converter parameters.
3. The apparatus of claim 1, wherein, the sending of the parameter synchronization setting frame to the multiple power converters based on parallel communication comprises: after the parallel control board receives a parameter synchronization request sent by the power converter, the parallel control board repeatedly sends the parameter synchronization setting frame to the multiple power converters based on the preset sending timing; if a repetition number of the repeatedly sending of the parameter synchronization setting frame by the parallel control board does not reach a preset number, and the parallel control board receives a parameter synchronization request sent by another power converter, the repetition number is cleared, and the repeatedly sending of the parameter synchronization setting frame to the multiple power converters based on the preset sending timing is restarted; if the repetition number of the repeatedly sending of the parameter synchronization setting frame by the parallel control board reaches the preset number, the parallel control board stops sending the parameter synchronization setting frame.
4. The parallel device according to claim 1, characterized in that, the parallel control board is further configured to start a parameter synchronization counter when a state machine of the parallel control board is in a parameter synchronization state; based on a parameter synchronization count within a preset time length, a parameter synchronization flag fed back by the power converter received is used to determine whether the parallel device completes parameter synchronization.
5. The apparatus of claim 4, wherein, the determination of whether the parallel device completes parameter synchronization based on the parameter synchronization count within the preset time length, the parameter synchronization flag fed back by the power converter received comprises: If the parameter synchronization flag fed back by at least one of the plurality of power converters is received within the pre-designed time duration, it is determined that the parallel operation device completes parameter synchronization. If the parameter synchronization flag fed back by the power converter is not received within the pre-designed time duration, it is determined that the parallel operation device does not complete parameter synchronization, a parameter asynchronization fault is reported, and the state machine of the parallel operation control board is adjusted to a fault state.
6. The apparatus of claim 1, wherein, The parallel operation device further comprises a data collector configured to collect the parameter asynchronization fault reported by the power converter and the parallel operation control board, and transmit the collected fault information to a client. 7.A power converter in parallel operation by using a parallel operation device, wherein the parallel operation device is the parallel operation device according to any one of claims 1 to 6, and wherein When the parameter synchronization setting frame is received, the power converter is configured to update the parameters of the power converter itself based on the power converter parameters in the parameter synchronization setting frame. If the parameters of the power converter itself are all updated, the power converter is configured to feed back a parameter synchronization completion flag to the parallel operation control board of the parallel operation device. If the parameters of the power converter itself are not updated after a pre-set time duration, the power converter is configured to report a parameter asynchronization fault, and adjust the state machine of the power converter to a fault state. 8.The power converter of claim 7, wherein When the state machine of the power converter is in a parameter synchronization state, and the power converter successfully communicates with the parallel operation control board, the power converter is configured to send a parameter synchronization request to the parallel operation control board.
9. A parallel system, characterized by The parallel operation device according to any one of claims 1 to 6 and the plurality of power converters according to any one of claims 7 to 8.
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