Power conversion device, and waveform recording method and system for power conversion device

Abstract

Provided in the present application are a power conversion device, and a waveform recording method and system for a power conversion device. The method comprises: when a power conversion device is in a grid-connected stage, a communication unit of the power conversion device forwarding to a data processing unit a received data acquisition message sent by an external adjustment device; according to the data acquisition mode indicated by the data acquisition message, the data processing unit acquiring grid-connected operation data of a power conversion unit in the grid-connected stage; on the basis of the acquired grid-connected operation data, generating a feedback message, and sending the feedback message to the communication unit; and the communication unit sending the feedback message to the external adjustment device, such that the external adjustment device monitors the grid-connected state of the power conversion device on the basis of the feedback message. The method involves acquiring the grid-connected operation data of the power conversion unit in a grid-connected working state, thus related technicians can adjust the power conversion unit and analyze the operation conditions thereof on the basis of the data, thereby improving the development and adjustment efficiency of power conversion units.

Description

Power conversion device, recording method and system for power conversion device

[0001] This application claims priority to a domestic application filed with the Patent Office of China on September 15, 2023, with application number 202311196327.6 and invention name “Power conversion equipment, recording method and system for power conversion equipment”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of new energy power generation technology, and in particular to a power conversion device, a wave recording method and a system for the power conversion device. Background Art

[0003] In the related art, during the development and debugging of the inverter, the simulator is usually connected to the data processing unit provided in the inverter, so that the grid-connected operation data of the inverter, such as the current and voltage, collected by the data processing unit, can be viewed through the simulator. However, in the above method, the relevant technical personnel can only view the current numerical value of the grid-connected operation data, but cannot understand the changes in the grid-connected operation data, specifically, they cannot understand the data values ​​during the grid-connected operation and the changes in the corresponding data. In addition, when the inverter is grid-connected, since the current passing through the inverter is usually large, it is usually necessary to disconnect the simulator from the data processing unit for safety reasons. In this case, the relevant technical personnel cannot understand the operation of the inverter and it is difficult to debug the inverter.

[0004] Summary of the Invention

[0005] In view of this, the purpose of this application is to provide a power conversion device, a recording method and a system for a power conversion device, so as to obtain the grid-connected operation data of the power conversion unit in a grid-connected working state, such as a grid-connected debugging working state, during the development and debugging process of the power conversion unit, so that relevant technical personnel can further debug the power conversion unit based on the data and analyze the operating status, thereby improving the development and debugging efficiency of the power conversion unit.

[0006] In a first aspect, an embodiment of the present application provides a power conversion device, which includes a power conversion unit, a data processing unit and a communication unit; wherein: the communication unit is used to forward the data acquisition message to the data processing unit when the power conversion device is in a grid-connected stage, such as a grid-connected debugging stage, when a data acquisition message sent by an external debugging device is received; the data processing unit is used to obtain the grid-connected operation data of the power conversion unit in the grid-connected process, such as the grid-connected debugging stage, according to the data acquisition method indicated by the data acquisition message when receiving the data acquisition message forwarded by the communication unit; generate a feedback message based on the obtained grid-connected operation data, and send the feedback message to the communication unit; the communication unit is also used to send the feedback message to the external debugging device when receiving the feedback message sent by the data processing unit, so that the external debugging device monitors the grid-connected status of the power conversion device based on the feedback message.

[0007] Furthermore, the above-mentioned data processing unit is specifically used to parse the data acquisition message and determine the data acquisition parameters; the data acquisition parameters are used to indicate the data acquisition method; based on the data acquisition method indicated by the data acquisition parameters, the grid-connected operation data of the power conversion unit during the grid-connected process is obtained.

[0008] Furthermore, the above-mentioned data acquisition parameters include a recording variable address; the recording variable address indicates the storage address of the grid-connected operation parameter to be obtained; the data processing unit is specifically used to read a specified amount of grid-connected operation data from the storage address indicated by the recording variable address.

[0009] Furthermore, the above-mentioned data acquisition parameters include a trigger source address, a trigger value parameter and a recording variable address; the trigger source address indicates the storage address of the trigger parameter; the data processing unit is specifically used to read the trigger parameter from the storage address indicated by the trigger source address before executing the reading of a specified number of grid-connected operation data from the storage address indicated by the recording variable address; based on the trigger parameter and the trigger value parameter, determine whether the trigger condition is met; if so, execute the step of reading a specified number of grid-connected operation data from the storage address indicated by the recording variable address.

[0010] Furthermore, the trigger condition includes: a trigger parameter is greater than or equal to a trigger value parameter, or a trigger parameter is less than a trigger value parameter.

[0011] Furthermore, the above-mentioned trigger parameters include a first trigger parameter and a second trigger parameter; the trigger value parameters include a first trigger value parameter corresponding to the first trigger parameter, and a second trigger value parameter corresponding to the second trigger parameter; the data processing unit is specifically used to determine whether the numerical comparison relationship between the first trigger parameter and the first trigger value parameter meets the first trigger condition, and obtain a first judgment result; determine whether the numerical comparison relationship between the second trigger parameter and the second trigger value parameter meets the second trigger condition, and obtain a second judgment result; based on the first judgment result and the second judgment result, determine whether to execute the step of reading a specified amount of grid-connected operation data from the storage address indicated by the recording variable address.

[0012] Furthermore, the above-mentioned first trigger condition includes: the first trigger parameter is greater than or equal to the first trigger value parameter, or the first trigger parameter is less than the first trigger value parameter; the second trigger condition includes: the second trigger parameter is greater than or equal to the second trigger value parameter, or the second trigger parameter is less than the second trigger value parameter.

[0013] Furthermore, the above-mentioned data processing unit is specifically used to execute the step of reading a specified number of grid-connected operation data from the storage address indicated by the recording variable address if the first judgment result is that the first trigger condition is met and the second judgment result is that the second trigger condition is met; or if the first judgment result is that the first trigger condition is met, or the second judgment result is that the second trigger condition is met, execute the step of reading a specified number of grid-connected operation data from the storage address indicated by the recording variable address.

[0014] Furthermore, the above data acquisition parameters also include a trigger type parameter; the trigger type parameter is used to indicate the numerical change mode of the trigger parameter reaching the trigger value parameter; the data processing unit is specifically used to determine whether the trigger parameter reaches the trigger value parameter using the numerical change mode corresponding to the trigger type.

[0015] Furthermore, the above-mentioned numerical value change mode includes from small to large, or from large to small, or from small to large and from large to small; the trigger type parameter corresponding to the numerical value change mode from small to large is rising edge trigger; the trigger type parameter corresponding to the numerical value change mode from large to small is falling edge trigger; the trigger type parameter corresponding to the numerical value change mode from small to large and from large to small is rising edge trigger and falling edge trigger.

[0016] Furthermore, the above-mentioned data acquisition parameters include a data type of a recording variable; the data processing unit is specifically used to package the acquired grid-connected operation data according to a packaging method corresponding to the data type of the recording variable, and generate a feedback message.

[0017] In the second aspect, an embodiment of the present application provides a recording method for a power conversion device, which is applied to a data processing unit of the power conversion device; the power conversion device also includes a power conversion unit and a communication unit; the method includes: receiving a data acquisition message forwarded by the communication unit; the data acquisition message is sent to the communication unit by an external debugging device when the power conversion device is in the grid-connected stage; according to the data acquisition method indicated by the data acquisition message, the grid-connected operation data of the power conversion unit in the grid-connected process is obtained; based on the obtained grid-connected operation data, a feedback message is generated, and the feedback message is sent to the communication unit, so that the communication unit sends the feedback message to the external debugging device, and the external debugging device monitors the grid-connected status of the power conversion device based on the feedback message.

[0018] Furthermore, the above-mentioned step of obtaining the grid-connected operation data of the power conversion unit during the grid-connected process according to the data acquisition method indicated by the data acquisition message includes: parsing the first message to determine the data acquisition parameters; and obtaining the grid-connected operation data of the power conversion unit during the grid-connected process based on the data acquisition parameters.

[0019] Furthermore, the above-mentioned data acquisition parameters include a recording variable address; the recording variable address is used to store the grid-connected operation data collected by the data processing unit; the step of obtaining the grid-connected operation data of the power conversion unit during the grid-connected process based on the data acquisition parameters includes: obtaining a specified number of the grid-connected operation data from the recording variable address.

[0020] Furthermore, the above-mentioned data acquisition parameters include a trigger source address, a trigger value parameter and a recording variable address; the trigger source address is used to store the first operating parameter collected by the data processing unit; the recording variable address is used to store the grid-connected operation data collected by the data processing unit; the step of obtaining the grid-connected operation data of the power conversion unit in the grid-connected process based on the data acquisition parameters includes: obtaining the first operating parameter from the trigger source address; judging whether the first operating parameter is equal to the trigger value parameter; if equal, obtaining a specified number of the grid-connected operation data from the recording variable address.

[0021] Furthermore, the above-mentioned data acquisition parameters also include a trigger type parameter; the trigger type parameter is used to indicate the numerical change mode of the first operating parameter reaching the trigger value parameter; the step of judging whether the first operating parameter is equal to the trigger value parameter includes: judging whether the first operating parameter reaches the trigger value parameter using the numerical change mode corresponding to the trigger type.

[0022] Furthermore, the step of obtaining a specified number of the grid-connected operation data from the wave recording variable address includes: obtaining a specified number of the grid-connected operation data stored in the wave recording variable address starting from the current moment.

[0023] Furthermore, the above-mentioned step of obtaining a specified number of the grid-connected operation data from the recording variable address includes: obtaining 1 / 2 of the specified number of grid-connected operation data stored in the recording variable address before the current moment, and 1 / 2 of the specified number of grid-connected operation data stored in the recording variable address starting from the current moment.

[0024] Furthermore, the above-mentioned data acquisition parameters include a recording variable data type; the step of generating a feedback message based on the acquired grid-connected operation data includes: packaging the acquired grid-connected operation data according to the packaging method corresponding to the recording variable data type to generate a feedback message.

[0025] In a third aspect, an embodiment of the present application provides another recording method for a power conversion device, which is applied to a communication unit of the power conversion device; the power conversion device also includes a power conversion unit and a data processing unit; the method includes: when receiving a data acquisition message sent by an external debugging device when the power conversion device is in the grid-connected stage, forwarding the data acquisition message to the data processing unit, so that the data processing unit obtains the grid-connected operation data of the power conversion unit in the grid-connected process according to the data acquisition method indicated by the data acquisition message, generates a feedback message based on the obtained grid-connected operation data, and sends the feedback message to the communication unit; receives the feedback message sent by the data processing unit, and sends the feedback message to the external debugging device, so that the external debugging device monitors the grid-connected status of the power conversion device based on the feedback message.

[0026] In a fourth aspect, an embodiment of the present application provides a wave recording system for a power conversion device, the system comprising the power conversion device as described above and an external debugging device.

[0027] The above-mentioned power conversion device, recording method and system for power conversion device, when the power conversion device is in the grid-connected stage, the communication unit of the power conversion device forwards the data acquisition message to the data processing unit when receiving the data acquisition message sent by the external debugging device; when the data processing unit receives the data acquisition message forwarded by the communication unit, the data processing unit obtains the grid-connected operation data of the power conversion unit during the grid-connected process according to the data acquisition method indicated by the data acquisition message; based on the obtained grid-connected operation data, a feedback message is generated and sent to the communication unit; when the communication unit receives the feedback message sent by the data processing unit, the feedback message is sent to the external debugging device, so that the external debugging device monitors the grid-connected status of the power conversion device based on the feedback message.

[0028] In this approach, the external debugging device communicates with the data processing unit via message transmission via the communication unit, preventing high currents from the power conversion equipment from passing through the external debugging device and potentially causing safety incidents, thereby improving safety. The data processing unit can obtain the power conversion unit's grid-connected operating data based on data acquisition messages sent by the external debugging device when the power conversion unit is in the grid-connected phase, and generate feedback messages, which are then sent to the external debugging device. This allows the external debugging device to monitor the power conversion device's grid-connected status based on the feedback messages, enabling relevant technical personnel to further debug the power conversion device and analyze its operating status, thereby improving the efficiency of power conversion device development and debugging.

[0029] Other features and advantages of the present application will be described in the following description, and in part will become apparent from the description or be understood by practicing the present application. The objectives and other advantages of the present application are realized and obtained by the structures particularly pointed out in the description, claims and drawings.

[0030] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without any creative work.

[0032] FIG1 is a schematic diagram of a connection structure of an inverter and a simulator in the related art;

[0033] FIG2 is a schematic structural diagram of a single power conversion device provided in an embodiment of the present application;

[0034] FIG3 is a flow chart of a method for recording a wave of a power conversion unit provided in an embodiment of the present application;

[0035] FIG4 is a flow chart of another method for recording a wave of a power conversion unit provided in an embodiment of the present application;

[0036] FIG5 is a flowchart of a wave recording system for a power conversion unit provided in an embodiment of the present application;

[0037] FIG6 is a schematic structural diagram of a wave recording system of a power conversion unit provided in an embodiment of the present application. DETAILED DESCRIPTION

[0038] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0039] Power conversion units are high-voltage inverter components that use power electronics for rectification, filtering, and inversion. They are commonly found in power conversion devices such as transformers and inverters. Taking the inverter as an example, as a power conversion device in the field of power electronics, during development and debugging, a simulator is typically connected to the power unit through the inverter's data acquisition module, as shown in Figure 1. Inverters typically incorporate current sensors, voltage sensors, and other data acquisition modules. After collecting parameters such as the power unit's current, voltage, and grid frequency through the data acquisition module, the simulator can be used to view the current values ​​of these variables. In this case, technicians must manually record changes in variables such as voltage and current to analyze the inverter's operation, which is inefficient.

[0040] After the inverter is connected to the grid, connected devices such as simulators may need to be disconnected for safety reasons. In this situation, the current grid-connected operating data values ​​of the inverter's power units cannot be observed. This prevents technicians from understanding the inverter's operating status and makes it difficult to debug the inverter.

[0041] Based on the above problems, the embodiments of the present application provide a power conversion device, a recording method and a system for a power conversion device. This technology can be applied to a new energy power generation system having a power conversion device.

[0042] To facilitate understanding of this embodiment, a power conversion device disclosed in an embodiment of the present application is first described in detail. As shown in Figure 2, the device includes a power conversion unit 100, a data processing unit 110, and a communication unit 120, which are connected in sequence. The communication unit 120 is also connected to a preset external debugging device.

[0043] In order to monitor the grid-connected status of the power conversion device in the grid-connected stage, relevant staff can generate a data acquisition message through an external debugging device and send the message to the above-mentioned communication unit, so that the communication unit forwards the data acquisition message to the data processing unit.

[0044] The above-mentioned external debugging device refers to a computer that can directly issue control commands, which can usually be a personal computer, an industrial computer, etc. The external debugging device is used to determine the data acquisition parameters. The data acquisition parameters can be determined based on the relevant information input by the relevant technical personnel into the external debugging device through the human-computer interaction device. The preset data acquisition parameters can be set in the external debugging device, and the preset data acquisition parameters can be determined as the data acquisition parameters by triggering a certain control on the display interface of the external debugging device. The data acquisition parameters can indicate the grid-connected operation data that needs to be obtained from the power conversion unit, such as the identification parameters of the grid-connected operation data, and can also indicate the data collection trigger conditions, such as time parameters or the identification parameters of a certain grid-connected operation data and the threshold value that needs to be reached, etc., or can indicate both at the same time.

[0045] External debugging equipment typically generates a data acquisition message based on data acquisition parameters and then transmits it to the data processing unit via the communication unit. A specific transmission method can be transparent transmission. Transparent transmission means that the transmission network is solely responsible for delivering the required services to the destination node, ensuring transmission quality, regardless of the service being transmitted. It does not process the transmitted services.

[0046] When the power conversion device is in the grid-connected phase, the communication unit, upon receiving a data acquisition message from an external debugging device, forwards the data acquisition message to the data processing unit. The communication unit can be implemented using a single-chip microcomputer, an ARM development board, or other device, and the specific implementation is not limited here.

[0047] Because the data processing unit is directly connected to the power conversion unit, the current flowing through it is typically high. When external debugging equipment is directly connected to the data processing unit, a failure in the power supply circuit often damages the external debugging equipment. However, with the communication unit installed, the external debugging equipment is not directly connected to the data processing unit and communicates with the communication unit only via messages. This prevents damage to the external debugging equipment in the event of a power supply circuit failure.

[0048] During the operation of the device, the data processing unit needs to collect the grid-connected operation data of the power conversion unit. The grid-connected operation data may include one or more of the current parameters passing through the power conversion unit, the voltage parameters at both ends of the power conversion unit, the grid frequency used by the power supply, the active power generated by the power module, and the reactive power. The specific settings can be based on the needs and are not limited here. The above-mentioned data processing unit can collect the grid-connected operation data of the power conversion unit in real time when it is in the power-on state, or it can start collecting and saving the parameter values ​​of the corresponding grid-connected operation data after receiving the data acquisition parameters. The data processing unit usually includes a storage module, and the storage location of the collected grid-connected operation data in the storage module is usually pre-allocated.

[0049] The data processing unit can generally be implemented by using a digital signal processor (DSP), a field programmable gate array (FPGA), or a single-chip microcomputer, or a combination of multiple devices. The specific implementation method can be set based on the needs and is not limited here.

[0050] After the data processing unit receives the data acquisition message forwarded by the communication unit, it can generate a feedback message based on the data acquisition message and the collected grid-connected operation data. The data processing unit can obtain the grid-connected operation data of the power conversion unit during the grid-connected process according to the data acquisition method indicated by the data acquisition message, usually the grid-connected operation data within a specified time period or a specified number. When the data acquisition parameter also indicates a trigger condition, the data processing unit needs to determine whether the trigger condition is met and then start to obtain the grid-connected operation data of the power conversion unit during the grid-connected process. After obtaining the grid-connected operation data, the data processing unit needs to generate a feedback message based on the acquired grid-connected operation data and send the feedback message to the communication unit.

[0051] When the communication unit receives the feedback message sent by the data processing unit, it sends the feedback message to the external debugging device, so that the external debugging device monitors the grid-connected status of the power conversion device based on the feedback message. Specifically, the external debugging device can generate a corresponding waveform image based on the specified duration or specified amount of grid-connected operation data in the feedback message, or process the data based on a preset processing algorithm. Specifically, the above-mentioned external debugging device can parse the feedback message to obtain the grid-connected operation data acquired by the data processing unit; wherein the grid-connected operation data is the data collected by the data processing unit within a specified duration or a specified amount of data collected. Then, a corresponding waveform image is generated based on the grid-connected operation data, and the waveform image is displayed on a graphical user interface, so that relevant technical personnel can analyze the operating status of the power conversion unit.

[0052] In the above-mentioned power conversion device, when the power conversion device is in the grid-connected stage, its communication unit forwards the data acquisition message to the data processing unit when receiving the data acquisition message sent by the external debugging device; when the data processing unit receives the data acquisition message forwarded by the communication unit, it obtains the grid-connected operation data of the power conversion unit during the grid-connected process in accordance with the data acquisition method indicated by the data acquisition message; based on the obtained grid-connected operation data, a feedback message is generated and sent to the communication unit; when the communication unit receives the feedback message sent by the data processing unit, it sends the feedback message to the external debugging device, so that the external debugging device monitors the grid-connected status of the power conversion device based on the feedback message.

[0053] In this approach, the external debugging device communicates with the data processing unit via message transmission via the communication unit, preventing high currents from the power conversion equipment from passing through the external debugging device and potentially causing safety incidents, thereby improving safety. The data processing unit can obtain the power conversion unit's grid-connected operating data based on data acquisition messages sent by the external debugging device when the power conversion unit is in the grid-connected phase, and generate feedback messages, which are then sent to the external debugging device. This allows the external debugging device to monitor the power conversion device's grid-connected status based on the feedback messages, enabling relevant technical personnel to further debug the power conversion device and analyze its operating status, thereby improving the efficiency of power conversion device development and debugging.

[0054] In a specific implementation, the data acquisition parameters usually include a recording variable address. The recording variable address is usually a variable address in the data processing unit for storing grid-connected operation data. It can be allocated to the data processing unit by an external debugging device, or it can be pre-set by the data processing unit. When the grid-connected operation data collected by the data processing unit is one type, then the grid-connected operation data is the grid-connected operation data that needs to be collected. The external debugging device needs to obtain the variable address in the data processing unit for storing the collected grid-connected operation data, and determine the variable address for storing the collected grid-connected operation data as the recording variable address. The data acquisition message generated by the external debugging device stores the information of the recording variable address.

[0055] After receiving the data acquisition message, the data processing unit can parse the message to determine data acquisition parameters. Then, based on the data acquisition method indicated by the data acquisition parameters, it can acquire grid-connected operation data of the power conversion unit during the grid-connected process. Because the data acquisition parameters include a waveform recording variable address, the data processing unit can store the grid-connected operation data collected from the waveform recording variable address at the current moment. After a set time, or when the amount of collected grid-connected operation data reaches a specified amount, the data processing unit can cease storing the data and determine the stored plurality of grid-connected operation data as the data acquisition parameters.

[0056] When the data acquisition parameter needs to indicate grid-connected operation data and data acquisition trigger conditions, it can be divided into two parts: a trigger parameter and a second data acquisition parameter. The second data acquisition parameter is used to indicate the grid-connected operation data that needs to be collected for the power conversion unit, and the trigger parameter is used to indicate the data acquisition trigger conditions. Grid-connected operation data can generally include multiple parameters, such as the current parameters and voltage parameters mentioned above.

[0057] To illustrate the case where the data acquisition parameters need to indicate the grid-connected operation data and the data acquisition trigger conditions, it is assumed that the grid-connected operation data includes two different types of grid-connected operation data, one of which can be used as a trigger parameter and the other can be used as the grid-connected operation data to be acquired. When the data acquisition trigger condition includes a mode in which the trigger parameter satisfies the trigger condition, the external debugging device needs to determine the trigger parameter and then determine the second data acquisition parameter based on the second grid-connected operation data and the trigger condition. In a specific implementation, the above-mentioned trigger parameter can be one or more types, and the above-mentioned second grid-connected operation data can be one or more types. For example, the trigger parameters can be voltage parameters and current parameters, and the trigger conditions that need to be met can be that the voltage parameter is greater than 200V and the current parameter is greater than 500mA.

[0058] The above-mentioned second data acquisition parameter usually includes a recording variable address; the external debugging device needs to obtain the variable address used to store the collected second grid-connected operation data in the data processing unit, and determine the variable address storing the second grid-connected operation data as the recording variable address.

[0059] The trigger parameters mentioned above usually include a trigger source address; the external debugging device needs to obtain the variable address for storing the collected trigger parameters in the data processing unit, and determine the variable address storing the trigger parameters as the trigger source address.

[0060] The above-mentioned trigger conditions may include a trigger parameter reaching a preset trigger threshold, or a trigger parameter being greater than (or equal to) a trigger value parameter, or a trigger parameter being less than (or equal to) a trigger value parameter, etc., which can be set specifically according to needs and are not limited here. The trigger threshold that the trigger parameter needs to reach can be pre-stored in the data processing unit. For example, when the trigger parameter is a voltage parameter, the data processing unit can automatically determine that the trigger threshold is 200V. When it is necessary to set the trigger threshold through an external debugging device, the trigger parameter also includes a trigger value parameter; the external debugging device is specifically used to determine the trigger threshold input by the relevant personnel or the pre-set trigger threshold as the trigger value parameter.

[0061] When the data acquisition parameters include a trigger source address, a trigger value parameter and a recording variable address, the data processing unit needs to read the trigger parameters from the storage address indicated by the trigger source address before executing the process of reading a specified amount of grid-connected operation data from the storage address indicated by the recording variable address; based on the trigger parameters and the trigger value parameters, determine whether the trigger conditions are met; if so, execute the process of reading a specified amount of grid-connected operation data from the storage address indicated by the recording variable address.

[0062] In the specific implementation process, the trigger parameter can be one or more, and the trigger parameter includes a first trigger parameter and a second trigger parameter for illustration. Correspondingly, the trigger value parameter also includes a first trigger value parameter corresponding to the first trigger parameter, and a second trigger value parameter corresponding to the second trigger parameter. After reading the first trigger parameter, the data processing unit needs to determine whether the numerical comparison relationship between the first trigger parameter and the first trigger value parameter meets the first trigger condition, and obtain a first judgment result; the above-mentioned first trigger condition can be that the first trigger parameter is greater than or equal to the first trigger value parameter, or the first trigger parameter is less than the first trigger value parameter. After reading the second trigger parameter, the data processing unit needs to determine whether the numerical comparison relationship between the second trigger parameter and the second trigger value parameter meets the second trigger condition, and obtain a second judgment result; the second trigger condition can be that the second trigger parameter is greater than or equal to the second trigger value parameter, or the second trigger parameter is less than the second trigger value parameter. Then, based on the first judgment result and the second judgment result, it is determined whether to execute the step of reading a specified amount of grid-connected operation data from the storage address indicated by the recording variable address.

[0063] The order of determining the first judgment result and the second judgment result can be set based on demand, and the process of determining the first judgment result and the second judgment result is usually performed at a set frequency. After determining the first judgment result and the second judgment result, the data processing unit can also execute the process of reading a specified amount of grid-connected operation data from the storage address indicated by the recording variable address when the first judgment result satisfies the first trigger condition and the second judgment result satisfies the second trigger condition. In the above case, both the first trigger condition and the second trigger condition must be met to trigger the process of collecting the grid-connected operation data.

[0064] The data processing unit may also execute a process of reading a specified amount of grid-connected operation data from the storage address indicated by the recording variable address if the first judgment result satisfies a first trigger condition, or if the second judgment result satisfies a second trigger condition. In the above case, only one of the first trigger condition and the second trigger condition needs to be met to trigger the collection of the grid-connected operation data.

[0065] In specific implementation, the trigger condition can also be that the numerical relationship between the first trigger parameter and the second trigger parameter is a specified numerical relationship, for example, the first trigger parameter is twice the second trigger parameter. The specific setting can be based on demand and is not limited here.

[0066] When the trigger condition is that a trigger parameter reaches a trigger threshold, the trigger parameter can actually reach the trigger threshold in different ways, such as increasing from a small value to a large value, or decreasing from a large value to a small value. When the trigger condition restricts the trigger parameter to reaching the preset trigger threshold in a predetermined way, the trigger parameter also includes a trigger type parameter; the external debugging device is specifically configured to determine the trigger type parameter based on the way the value changes.

[0067] Specifically, the above-mentioned numerical value change mode includes from small to large, or from large to small, or from small to large and from large to small; in response to the numerical value change mode from small to large, the external debugging device can determine that the trigger type parameter is a rising edge trigger; in response to the numerical value change mode from large to small, the trigger type parameter can be determined to be a falling edge trigger; in response to the numerical value change mode from small to large and from large to small, the trigger type parameter can be determined to be a rising edge trigger and a falling edge trigger.

[0068] Correspondingly, the data processing unit needs to read the trigger parameters from the trigger source address and determine whether the trigger parameters reach the trigger value parameters using the numerical change method corresponding to the trigger type. Specifically, if the trigger type is a rising edge, the variable value corresponding to the trigger source address reaches the trigger value from small to large, which is a successful trigger; otherwise, the trigger is unsuccessful; if the trigger type is a falling edge, the variable value corresponding to the trigger source address reaches the trigger value from large to small, which is a successful trigger; otherwise, the trigger is unsuccessful; if the trigger type is a rising or falling edge, the variable value corresponding to the trigger source address reaches the trigger value from large to small or from small to large, which is a successful trigger; otherwise, the trigger is unsuccessful.

[0069] Because different types of data are typically processed differently during message transmission, the data acquisition parameters also need to include a waveform variable data type parameter. The external debugging device can determine the data type of the grid-connected operation data collected at the waveform variable address as the waveform variable data type parameter. Accordingly, the data processing unit needs to package the grid-connected operation data according to the packaging method corresponding to the waveform variable data type to generate a feedback message.

[0070] When the data acquisition trigger conditions can be determined from the data acquisition parameters, the following two methods can be used to store the grid-connected operation data in the data processing unit:

[0071] (1) The data processing unit acquires a specified amount of grid-connected operation data stored in the waveform variable address starting from the current moment. That is, when the data acquisition trigger condition (also known as the "latch data condition") is met, the array defined by the data processing unit begins latching the value of the grid-connected operation data (also known as the "wave recording variable").

[0072] (2) The data processing unit acquires half of the specified amount of grid-connected operation data stored in the address of the waveform variable before the current moment, and acquires half of the specified amount of grid-connected operation data stored in the address of the waveform variable starting from the current moment. That is, from the moment the data acquisition trigger condition is met, half of the data values ​​of the array defined in the data processing unit are stored again, and the real-time value of the waveform variable with a length of half the array length is stored, thus obtaining the data values ​​of the waveform variable before and after the trigger.

[0073] Corresponding to the above-mentioned power conversion equipment embodiment, the present application also provides a method for recording waveforms of a power conversion device. This method is applied to the data processing unit of the above-mentioned power conversion device. The power conversion device also includes a power conversion unit and a communication unit. As shown in Figure 3, this method includes the following steps:

[0074] Step S302 , receiving a data acquisition message forwarded by a communication unit; the data acquisition message is sent to the communication unit by an external debugging device when the power conversion device is in a grid-connected stage.

[0075] Step S304 : acquiring the grid-connected operation data of the power conversion unit during the grid-connected process according to the data acquisition method indicated by the data acquisition message.

[0076] The data processing unit usually needs to parse the data acquisition message to obtain data acquisition parameters, and further determine the data acquisition method based on the data acquisition parameters, such as which grid-connected operation data to obtain and under what conditions to obtain the data.

[0077] In a specific implementation, the data acquisition parameter typically includes a waveform recording variable address, which indicates the storage address of the grid-connected operation parameter to be acquired. The data processing unit can read a specified amount of grid-connected operation data from the storage address indicated by the waveform recording variable address.

[0078] The data acquisition parameters may also include a trigger source address, a trigger value parameter, and a waveform variable address. The trigger source address indicates the storage address of the trigger parameters. The data processing unit is required to read the trigger parameters from the storage address indicated by the trigger source address before reading a specified amount of grid-connected operation data from the storage address indicated by the waveform variable address. Based on the trigger parameters and the trigger value parameter, the data processing unit is required to determine whether the trigger condition is met. If so, the data processing unit is required to read the specified amount of grid-connected operation data from the storage address indicated by the waveform variable address.

[0079] When the data acquisition parameters also include a trigger type parameter, which is used to indicate the way in which the trigger parameter changes its value when it reaches the trigger value parameter, the data processing unit also needs to determine whether the trigger parameter reaches the trigger value parameter using the numerical change method corresponding to the trigger type, such as changing from large to small to reach the trigger value parameter.

[0080] There are two ways to read a specified amount of grid-connected operation data from the storage address indicated by the recording variable address:

[0081] (1) Directly obtain the specified amount of grid-connected operation data stored in the recording variable address starting from the current moment. This method is suitable for situations where only the grid-connected operation data after the current moment is concerned.

[0082] (2) Obtain 1 / 2 of the specified amount of grid-connected operation data stored in the recording variable address before the current moment, and 1 / 2 of the specified amount of grid-connected operation data stored in the recording variable address starting from the current moment. This method is suitable for the case where the grid-connected operation data before and after the current moment are of interest.

[0083] Step S306: Generate a feedback message based on the acquired grid-connected operation data, and send the feedback message to the communication unit, so that the communication unit sends the feedback message to the external debugging device, and the external debugging device monitors the grid-connected status of the power conversion device based on the feedback message.

[0084] Generating messages based on data of different data types typically requires different processing methods. Data acquisition parameters typically also include the data type of the waveform variable. The data processing unit must package the acquired grid-connected operation data according to the packaging method corresponding to the waveform variable data type to generate a feedback message.

[0085] In the above method, the data processing unit of the power conversion device receives the data acquisition message forwarded by the communication unit; the data acquisition message is sent to the communication unit by the external debugging device when the power conversion device is in the grid-connected stage; the grid-connected operation data of the power conversion unit in the grid-connected process is obtained according to the data acquisition method indicated by the data acquisition message; based on the obtained grid-connected operation data, a feedback message is generated, and the feedback message is sent to the communication unit, so that the communication unit sends the feedback message to the external debugging device, and the external debugging device monitors the grid-connected status of the power conversion device based on the feedback message.

[0086] In this manner, the data processing unit can obtain the grid-connected operation data of the power conversion unit based on the data acquisition message sent by the external debugging device when the power conversion unit is in the grid-connected stage, and generate a feedback message, and send it to the external debugging device, so that the external debugging device can monitor the grid-connected status of the power conversion device based on the feedback message, thereby enabling relevant technical personnel to further debug the power conversion device and analyze the operating conditions, thereby improving the development and debugging efficiency of the power conversion device.

[0087] The present application provides another method for recording waveforms of a power conversion device, which is applied to a communication unit of the power conversion device described above. The power conversion device further includes a power conversion unit and a data processing unit. As shown in FIG4 , the method includes the following steps:

[0088] Step S402: When receiving a data acquisition message sent by an external debugging device when the power conversion device is in the grid-connected stage, the data acquisition message is forwarded to the data processing unit, so that the data processing unit obtains the grid-connected operation data of the power conversion unit in the grid-connected process according to the data acquisition method indicated by the data acquisition message, generates a feedback message based on the obtained grid-connected operation data, and sends the feedback message to the communication unit.

[0089] Step S404: receiving a feedback message sent by the data processing unit, and sending the feedback message to an external debugging device, so that the external debugging device monitors the grid-connected state of the power conversion device based on the feedback message.

[0090] In the above process, the communication unit usually plays the role of message forwarding and does not perform other processing.

[0091] In the above method, when the power conversion device receives a data acquisition message sent by an external debugging device when the power conversion device is in the grid-connected stage, the data acquisition message is forwarded to the data processing unit, so that the data processing unit obtains the grid-connected operation data of the power conversion unit in the grid-connected process according to the data acquisition method indicated by the data acquisition message, generates a feedback message based on the obtained grid-connected operation data, and sends the feedback message to the communication unit; receives the feedback message sent by the data processing unit, and sends the feedback message to the external debugging device, so that the external debugging device monitors the grid-connected status of the power conversion device based on the feedback message.

[0092] In this approach, the external debugging device communicates with the data processing unit via message transmission via the communication unit. This prevents high currents from the power conversion equipment from passing through the external debugging device and potentially causing safety incidents, thereby improving safety. Furthermore, upon receiving the data acquisition message, the data processing unit can obtain the power conversion unit's grid-connected operating data and generate a feedback message, which it then sends to the external debugging device. This allows the external debugging device to monitor the power conversion unit's grid-connected status based on the feedback message, enabling relevant technical personnel to further debug the power conversion device and analyze its operating status, thereby improving the efficiency of power conversion device development and debugging.

[0093] An embodiment of the present application also provides another wave recording system for a power conversion unit, in which a DSP control module is used as a data processing unit and an ARM template (also called an "ARM development board") is used as a communication unit.

[0094] Among them, the external debugging device (also known as the "external debugging device module") is used to set and issue the trigger mode, mainly through the recording variable address, recording variable data type, trigger source address, trigger source data type, trigger value, trigger type and other parameters to achieve the setting of the trigger mode. At the same time, the external debugging device also receives and parses the grid-connected operation data from the DSP control board module (also known as "latch data"), and draws and displays the waveform of the recording variable according to the grid-connected operation data on the external debugging device interface. The ARM control board module is only used to transparently transmit the reciprocating messages between the external debugging device and the DSP control board module. The DSP control board module parses the external debugging device message, latches the data according to the trigger mode specified by the external debugging device, and packages the latched data into a message to reply to the external debugging device.

[0095] As shown in Figure 5, when debugging and recording the inverter in grid-connected operation is required, the following method can be implemented through the above system:

[0096] 1. Set the corresponding variables in the external debugging device based on the trigger mode. If the trigger mode is set to automatic, set the two data acquisition parameters in the external debugging device: the recording variable address and the recording variable data type. If the trigger mode is set to manual, multiple data acquisition parameters must be set, including the trigger source address, trigger source data type, trigger value, trigger type, recording variable address, and recording variable data type. Automatic triggering is considered to be triggered when the recording variable address and recording variable data type are issued. Manual triggering is triggered when the variable value corresponding to the trigger source address reaches the trigger value according to the trigger type.

[0097] In specific implementation, the above-mentioned recording variable address is the memory address of the grid-connected operation data (also called "variable") that needs to be recorded in the DSP program, in the form of 0x0008853. The above-mentioned recording variable data type is the data type of the variable that needs to be recorded in the DSP program, mainly including integer (int), short integer (short), long integer (long), single-precision floating point type (float) and double-precision floating point type (double). The above-mentioned trigger source address is the memory address of the variable used to judge the trigger condition in the DSP program, in the form of 0x0008851; the above-mentioned trigger source data type is the data type of the variable used for triggering in the DSP program, mainly including integer (int), short integer (short), long integer (long), single-precision floating point type (float) and double-precision floating point type (double). The above-mentioned trigger types mainly include rising edge triggering, falling edge triggering, rising or falling edge triggering.

[0098] 2. The external debugging device assembles and sends the message according to the result set in step 1 above. The message is transparently transmitted to the DSP control board module through the ARM control board module.

[0099] 3. The DSP control board module receives the message transmitted by the ARM control board and parses it. When the trigger mode is automatic, the DSP control board module directly starts latching the data, that is, saving the grid-connected operation data collected in the recording variable address. When the trigger mode is manual, it is necessary to determine whether the grid-connected operation data corresponding to the trigger source address has reached the trigger value according to the trigger type. If the trigger value is reached, the trigger is successful, and the DSP control board module starts latching the data. If the trigger value is not reached, it continues to wait.

[0100] When latching the grid-connected operation data, the following two methods can be used: one is that from the moment the latching data conditions are met, the array defined by the DSP control board module begins to re-store the real-time value of the recording variable, that is, the data value of the recording variable after the trigger is obtained; the second is that from the moment the latching data conditions are met, half of the data values ​​of the array defined in the DSP control board module are retained, and then the real-time value of the recording variable with a length of half the array length is re-stored, that is, the data values ​​of the recording variable before and after the trigger are obtained.

[0101] 4. The DSP control board module packages the latched data mentioned in 3 above and sends a message. The message still needs to be transparently transmitted to the external debugging device through the ARM control board. The external debugging device parses the message to obtain the latched data, and draws points and connects the latched data in the external debugging device interface to display the waveform of the recorded variable, completing the recording function.

[0102] This system solves the problem of being unable to view the waveforms of inverter program variables during development and debugging during grid-connected operation. It enables both manual and automatic waveform recording triggering modes. Automatic triggering allows for convenient and rapid observation of waveform recording variables, while manual triggering facilitates observation of the relationship between the recorded variables and the trigger source. Both waveform recording triggering modes effectively improve inverter development and debugging efficiency.

[0103] Corresponding to the embodiment of the recording system of the power conversion unit, this embodiment further provides a recording system of a power conversion device. As shown in FIG6 , the system includes the power conversion device 10 and an external debugging device 20 as described above.

[0104] The aforementioned power conversion unit recording system achieves the same technical benefits as the aforementioned power conversion equipment: the external debugging device communicates with the data processing unit via message transmission via the communication unit, preventing high currents from the power conversion equipment from passing through the external debugging device and causing safety accidents, thereby improving safety. The data processing unit can obtain the power conversion unit's grid-connected operating data based on data acquisition messages sent by the external debugging device when the power conversion unit is in the grid-connected phase, and generate feedback messages, which are sent to the external debugging device. This allows the external debugging device to monitor the power conversion device's grid-connected status based on the feedback messages, enabling relevant technical personnel to further debug the power conversion device and analyze its operating status, thereby improving the efficiency of power conversion device development and debugging.

[0105] The recording system of the power conversion unit provided in the embodiment of the present application has the same technical features as the power conversion device and recording method thereof provided in the above-mentioned embodiment, so it can also solve the same technical problems and achieve the same technical effects.

[0106] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working process of the recording system of the power conversion unit described above can refer to the corresponding process in the aforementioned method embodiment and will not be repeated here.

[0107] In addition, in the description of the embodiments of this application, unless otherwise specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0108] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a number of instructions for enabling 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 aforementioned storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0109] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this application and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0110] Finally, it should be noted that the above embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application, rather than to limit them. The scope of protection of the present application is not limited thereto. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that any person skilled in the art who is familiar with the technical field can still modify the technical solutions described in the above embodiments within the technical scope disclosed in the present application, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not deviate from the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A power conversion device, characterized in that: The power conversion device comprises a power conversion unit, a data processing unit and a communication unit; wherein: The communication unit is used for forwarding the data acquisition message to the data processing unit when receiving the data acquisition message sent by the external debugging device when the power conversion device is in the grid-connected stage; The data processing unit is configured to, upon receiving the data acquisition message forwarded by the communication unit, acquire the grid-connected operation data of the power conversion unit during the grid-connected process according to the data acquisition method indicated by the data acquisition message; generate a feedback message based on the acquired grid-connected operation data, and send the feedback message to the communication unit; The communication unit is further configured to send the feedback message to the external debugging device when receiving the feedback message sent by the data processing unit, so that the external debugging device monitors the grid-connected state of the power conversion device based on the feedback message.

2. The power conversion device according to claim 1, characterized in that: The data processing unit is specifically used to parse the data acquisition message and determine the data acquisition parameters; the data acquisition parameters are used to indicate the data acquisition method; based on the data acquisition method indicated by the data acquisition parameters, the grid-connected operation data of the power conversion unit during the grid-connected process is obtained.

3. The power conversion device according to claim 2, characterized in that: The data acquisition parameter includes a waveform recording variable address; the waveform recording variable address indicates the storage address of the grid-connected operation parameter to be acquired; The data processing unit is specifically used to read a specified amount of grid-connected operation data from the storage address indicated by the recording variable address.

4. The power conversion device according to claim 3, characterized in that: The data acquisition parameters also include: a trigger source address and a trigger value parameter; the trigger source address indicates a storage address of the trigger parameter; The data processing unit is specifically used to read the trigger parameter from the storage address indicated by the trigger source address before executing the reading of the specified amount of grid-connected operation data from the storage address indicated by the recording variable address; based on the trigger parameter and the trigger value parameter, Determine whether the trigger condition is met; if so, execute the step of reading a specified amount of grid-connected operation data from the storage address indicated by the recording variable address.

5. The power conversion device according to claim 4, characterized in that: The trigger condition includes: the trigger parameter is greater than or equal to the trigger value parameter, or the trigger parameter is less than the trigger value parameter.

6. The power conversion device according to claim 4, characterized in that: The trigger parameter includes a first trigger parameter and a second trigger parameter; the trigger value parameter includes a first trigger value parameter corresponding to the first trigger parameter, and a second trigger value parameter corresponding to the second trigger parameter; The data processing unit is specifically used to determine whether the numerical comparison relationship between the first trigger parameter and the first trigger value parameter meets the first trigger condition, and obtain a first judgment result; determine whether the numerical comparison relationship between the second trigger parameter and the second trigger value parameter meets the second trigger condition, and obtain a second judgment result; Based on the first judgment result and the second judgment result, it is determined whether to execute the step of reading a specified amount of grid-connected operation data from the storage address indicated by the recording variable address.

7. The power conversion device according to claim 6, characterized in that: The first trigger condition includes: the first trigger parameter is greater than or equal to the first trigger value parameter, or the first trigger parameter is less than the first trigger value parameter; The second trigger condition includes: the second trigger parameter is greater than or equal to the second trigger value parameter, or the second trigger parameter is less than the second trigger value parameter.

8. The power conversion device according to claim 6, characterized in that: The data processing unit is specifically used to execute the step of reading a specified number of grid-connected operation data from the storage address indicated by the recording variable address if the first judgment result is that the first trigger condition is satisfied, and the second judgment result is that the second trigger condition is satisfied; or if the first judgment result is that the first trigger condition is satisfied, or the second judgment result is that the second trigger condition is satisfied, execute the step of reading a specified number of grid-connected operation data from the storage address indicated by the recording variable address.

9. The power conversion device according to claim 4, characterized in that: The data acquisition parameter also includes a trigger type parameter; the trigger type parameter is used to indicate the value change mode of the trigger parameter reaching the trigger value parameter; The data processing unit is specifically configured to determine whether the trigger parameter reaches the trigger value parameter in a numerical value change manner corresponding to the trigger type.

10. The power conversion device according to claim 9, characterized in that The numerical value change mode includes from small to large, or from large to small, or from small to large or from large to small; The value change mode is from small to large and the corresponding trigger type parameter is rising edge trigger; The value change mode is from large to small and the corresponding trigger type parameter is falling edge trigger; The value change mode is from small to large or from large to small, and the corresponding trigger type parameters are rising edge trigger and falling edge trigger.

11. The power conversion device according to claim 2, characterized in that: The data acquisition parameters include the data type of the recorded variable; The data processing unit is specifically used to package the acquired grid-connected operation data according to the package packaging method corresponding to the data type of the recorded variable to generate a feedback message.

12. A method for recording a wave of a power conversion device, characterized in that: The method is applied to a data processing unit of a power conversion device; the power conversion device further comprises a power conversion unit and a communication unit; the method comprises: receiving a data acquisition message forwarded by the communication unit; the data acquisition message is sent to the communication unit by an external debugging device when the power conversion device is in a grid-connected stage; Acquire the grid-connected operation data of the power conversion unit during the grid-connected process according to the data acquisition method indicated by the data acquisition message; Based on the acquired grid-connected operation data, a feedback message is generated, and the feedback message is sent to the communication unit, so that the communication unit sends the feedback message to the external debugging device, and the external debugging device monitors the grid-connected status of the power conversion device based on the feedback message.

13. A method for recording a wave of a power conversion device, characterized in that: The method is applied to a communication unit of a power conversion device; the power conversion device further comprises a power conversion unit and a data processing unit; the method comprises: When receiving a data acquisition message sent by the external debugging device when the power conversion device is in the grid-connected stage, forwarding the data acquisition message to the data processing unit, so that the data processing unit obtains the grid-connected operation data of the power conversion unit in the grid-connected process according to the data acquisition method indicated by the data acquisition message, generates a feedback message based on the obtained grid-connected operation data, and sends the feedback message to the communication unit; A feedback message sent by the data processing unit is received, and the feedback message is sent to the external debugging device, so that the external debugging device monitors the grid-connected state of the power conversion device based on the feedback message.

14. A wave recording system for a power conversion device, characterized in that: The system comprises a power conversion device as described in any one of claims 1 to 11 and an external debugging device.

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