EP-4742487-A1 - POWER CONVERSION DEVICE, AND WAVEFORM RECORDING METHOD AND SYSTEM FOR POWER CONVERSION DEVICE

EP4742487A1EP 4742487 A1EP4742487 A1EP 4742487A1EP-4742487-A1

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.

Inventors

XI, Zhigui
LI, HAITAO
ZHANG, ZHONGYANG

Assignees

Sungrow Power Supply Co., Ltd.

Dates

Publication Date: 20260513
Application Date: 20240318

Claims (14)

A power conversion apparatus, characterized by comprising a power conversion unit, a data processing unit and a communication unit, wherein the communication unit is configured to forward, in response to receiving a data acquisition message sent from an external commissioning apparatus, the data acquisition message to the data processing unit when the power conversion apparatus is in a grid-connected stage; the data processing unit is configured to acquire, in response to receiving the data acquisition message forwarded from the communication unit, grid-connection operation data of the power conversion unit during a grid-connected process based on a data acquisition mode indicated by the data acquisition message, and the data processing unit is configured to generate a feedback message based on the acquired grid-connection operation data, and send the feedback message to the communication unit; and the communication unit is further configured to send, in response to receiving the feedback message sent from the data processing unit, the feedback message to the external commissioning apparatus, to enable the external commissioning apparatus to monitor a grid-connected state of the power conversion apparatus based on the feedback message.
The power conversion apparatus according to claim 1, wherein the data processing unit is further configured to parse the data acquisition message to determine a data acquisition parameter, wherein the data acquisition parameter is used to indicate the data acquisition mode, and the data processing unit is further configured to acquire the grid-connection operation data of the power conversion unit during the grid-connected process based on the data acquisition mode indicated by the data acquisition parameter.
The power conversion apparatus according to claim 2, wherein the data acquisition parameter comprises a waveform recording variable address, wherein the waveform recording variable address indicates a storage address of a grid-connected operation parameter to be acquired; and the data processing unit is further configured to read a specified number of grid-connection operation data from the storage address indicated by the waveform recording variable address.
The power conversion apparatus according to claim 3, wherein the data acquisition parameter further comprises: a trigger source address and a trigger value parameter, wherein the trigger source address indicates a storage address of a trigger parameter; and the data processing unit is further configured to read the trigger parameter from the storage address indicated by the trigger source address before performing the reading a specified number of grid-connection operation data from the storage address indicated by the waveform recording variable address, the data processing unit is further configured to determine whether a trigger condition is satisfied based on the trigger parameter and the trigger value parameter, and the data processing unit is further configured to perform, in response to the trigger condition being satisfied, the reading a specified number of grid-connection operation data from the storage address indicated by the waveform recording variable address.
The power conversion apparatus according to claim 4, wherein the trigger condition comprises: the trigger parameter being greater than or equal to the trigger value parameter, or the trigger parameter being less than the trigger value parameter.
The power conversion apparatus according to claim 4, wherein the trigger parameter comprises a first trigger parameter and a second trigger parameter, and the trigger value parameter comprises a first trigger value parameter corresponding to the first trigger parameter and a second trigger value parameter corresponding to the second trigger parameter; and the data processing unit is further configured to determine whether a numerical comparison relationship between the first trigger parameter and the first trigger value parameter satisfies a first trigger condition to obtain a first determination result, the data processing unit is further configured to determine whether a numerical comparison relationship between the second trigger parameter and the second trigger value parameter satisfies a second trigger condition to obtain a second determination result, and the data processing unit is further configured to determine, based on the first determination result and the second determination result, whether to perform the reading a specified number of grid-connection operation data from the storage address indicated by the waveform recording variable address.
The power conversion apparatus according to claim 6, wherein the first trigger condition comprises: the first trigger parameter being greater than or equal to the first trigger value parameter, or the first trigger parameter being less than the first trigger value parameter; and the second trigger condition comprises: the second trigger parameter being greater than or equal to the second trigger value parameter, or the second trigger parameter being less than the second trigger value parameter.
The power conversion apparatus according to claim 6, wherein the data processing unit is further configured to perform, in response to the first determination result of the first trigger condition being satisfied and the second determination result of the second trigger condition being satisfied, the reading a specified number of grid-connection operation data from the storage address indicated by the waveform recording variable address, or the data processing unit is further configured to perform, in response to the first determination result of the first trigger condition being satisfied or the second determination result of the second trigger condition being satisfied, the reading a specified number of grid-connection operation data from the storage address indicated by the waveform recording variable address.
The power conversion apparatus according to claim 4, wherein the data acquisition parameter further comprises a trigger type parameter, wherein the trigger type parameter is used to indicate a numerical change mode of the trigger parameter reaching the trigger value parameter; and the data processing unit is further configured to determine whether the trigger parameter reaches the trigger value parameter in a numerical change mode corresponding to the trigger type parameter.
The power conversion apparatus according to claim 9, wherein the numerical change mode comprises changing from small to large, or changing from large to small, or both changing from small to large and changing from large to small; the trigger type parameter corresponding to the numerical change mode of changing from small to large is rising edge triggering; the trigger type parameter corresponding to the numerical change mode of changing from large to small is falling edge triggering; and the trigger type parameter corresponding to the numerical change mode of changing from small to large and changing from large to small is rising edge triggering and falling edge triggering.
The power conversion apparatus according to claim 2, wherein the data acquisition parameter comprise a waveform recording variable data type; and the data processing unit is further configured to perform package on the acquired grid-connection operation data based on a package mode corresponding to the waveform recording variable data type to generate the feedback message.
A waveform recording method for a power conversion apparatus, characterized in that , the method is applied to a data processing unit of the power conversion apparatus, wherein the power conversion apparatus further comprises a power conversion unit and a communication unit, wherein the method comprises: receiving a data acquisition message forwarded from the communication unit, wherein the data acquisition message is sent to the communication unit by an external commissioning apparatus when the power conversion apparatus is in a grid-connected stage; acquiring grid-connection operation data of the power conversion unit during a grid-connected process based on a data acquisition mode indicated by the data acquisition message; and generating a feedback message based on the acquired grid-connection operation data, and sending the feedback message to the communication unit, to enable the communication unit to send the feedback message to the external commissioning apparatus, wherein a grid-connected state of the power conversion apparatus is monitored by the external commissioning apparatus based on the feedback message.
A waveform recording method for a power conversion apparatus, characterized in that , the method is applied to a communication unit of the power conversion apparatus, wherein the power conversion apparatus further comprises a power conversion unit and a data processing unit, wherein the method comprises: forwarding, in response to receiving a data acquisition message sent from an external commissioning apparatus when the power conversion apparatus is in a grid-connected stage, a data acquisition message to the data processing unit, to enable the data processing unit to acquire grid-connection operation data of the power conversion unit during a grid-connected process based on a data acquisition mode indicated by the data acquisition message, generating a feedback message based on the acquired grid-connection operation data, and sending the feedback message to the communication unit; and receiving the feedback message sent from the data processing unit, and sending the feedback message to the external commissioning apparatus, to enable the external commissioning apparatus to monitor a grid-connected state of the power conversion apparatus based on the feedback message.
A waveform recording system for a power conversion apparatus, characterized in that , the waveform recording system comprises the power conversion apparatus and the external commissioning apparatus according to any one of claims 1 to 11.

Description

The present disclosure claims the priority to Chinese Patent Application No. 202311196327.6, titled "POWER CONVERSION DEVICE, AND WAVEFORM RECORDING METHOD AND SYSTEM FOR POWER CONVERSION DEVICE", filed on September 15, 2023 with the China National Intellectual Property Administration, which is incorporated herein by reference in its entirety. FIELD The present disclosure relates to the technical field of renewable energy power generation, and in particular to a power conversion apparatus, and a waveform recording method and a waveform recording system for a power conversion apparatus. BACKGROUND In the related art, during a development and adjustment process of an inverter, a simulator is connected to a data processing unit provided in the inverter, to view grid-connection operation data such as a current and a voltage of the inverter collected by the data processing unit through the simulator. However, in the above-mentioned method, technical personnel can only view a value of current grid-connection operation data, but cannot know a change situation of the grid-connection operation data. Specifically, technical personnel cannot know a value and a corresponding change situation of the data during a grid-connected operation process. In addition, when the inverter operates in grid connection, since a current passing through the inverter is large, the simulator and the data processing unit need to be disconnected for safety reasons. In this case, technical personnel cannot know an operation condition of the inverter, making it difficult to adjust the inverter. SUMMARY In view of this, the purpose of the present disclosure is to provide a power conversion apparatus, and a waveform recording method and a waveform recording system for a power conversion apparatus, to acquire grid-connection operation data of a power conversion unit in a grid-connected working state, such as a grid-connected adjustment working state, during a development and adjustment process of the power conversion unit. Technical personnel may further adjust the power conversion unit and analyze an operation condition based on the data, and development and adjustment efficiency of the power conversion unit is improved. In a first aspect, a power conversion apparatus is provided according to an embodiment of the present disclosure. The power conversion apparatus includes a power conversion unit, a data processing unit and a communication unit. The communication unit is configured to forward, in response to receiving a data acquisition message sent from an external commissioning apparatus, the data acquisition message to the data processing unit when the power conversion apparatus is in a grid-connected stage, such as a grid-connected adjustment stage. The data processing unit is configured to acquire, in response to receiving the data acquisition message forwarded from the communication unit, grid-connection operation data of the power conversion unit during a grid-connected process, such as the grid-connected adjustment stage, based on a data acquisition mode indicated by the data acquisition message, and the data processing unit is configured to generate a feedback message based on the acquired grid-connection operation data, and send the feedback message to the communication unit. The communication unit is further configured to send, in response to receiving the feedback message sent from the data processing unit, the feedback message to the external commissioning apparatus, to enable the external commissioning apparatus to monitor a grid-connected state of the power conversion apparatus based on the feedback message. In an embodiment, the data processing unit is further configured to parse the data acquisition message to determine a data acquisition parameter, where the data acquisition parameter is used to indicate the data acquisition mode, and the data processing unit is further configured to acquire the grid-connection operation data of the power conversion unit during the grid-connected process based on the data acquisition mode indicated by the data acquisition parameter. In an embodiment, the data acquisition parameter includes a waveform recording variable address, where the waveform recording variable address indicates a storage address of a grid-connected operation parameter to be acquired. The data processing unit is further configured to read a specified number of grid-connection operation data from the storage address indicated by the waveform recording variable address. In an embodiment, the data acquisition parameter includes a trigger source address, a trigger value parameter and the waveform recording variable address, where the trigger source address indicates a storage address of a trigger parameter. The data processing unit is further configured to read the trigger parameter from the storage address indicated by the trigger source address before performing the reading a specified number of grid-connection operation data