CN-122001381-A - Compression storage and restoration method and device for flexible direct current valve control data

Abstract

The invention relates to a compression storage and restoration method and device for flexible direct current valve control data, and belongs to the field of flexible direct current transmission of power systems. The method skips the intermediate text format, directly adopts the binary format to carry out real-time compression storage on the high-frequency recording data, and supports data reduction and visualization through ASCII codes. The invention can realize real-time lossless recording of data with the sampling rate up to 100kHz, remarkably reduces the occupied storage space and the data transfer time, and provides an efficient technical means for real-time state analysis and fault accurate positioning of a flexible direct valve control system.

Inventors

• CHEN YUE
• LIU JINGYI
• LI WENYA
• FAN HONGWEI
• ZHOU HUI
• ZHAO YANGYANG
• ZHANG ZHUANG
• ZHANG CHENGLONG
• LU XIANG
• JIAO SHI
• LU JING
• ZU LIFENG
• TENG LINYANG
• FENG MIN
• MA TAIHU
• MU XIAOLE

Assignees

• 中国南方电网有限责任公司超高压输电公司
• 许继电气股份有限公司

Dates

Publication Date

20260508

Application Date

20251230

Claims (10)

1. 1. The compression storage and restoration method of the flexible direct current valve control data is characterized by comprising the following steps of: The data compression and storage step is that high-speed recording data of the flexible direct current valve control system are collected in real time, and the high-speed recording data are converted into binary format and stored into data storage packets for storage; and a data reduction display step, namely reading the data storage package, and converting binary format data in the data storage package into an ASCII code format for analysis and visual display.
2. 2. The compression storage and restoration method for flexible direct current valve control data according to claim 1, wherein in the data compression storage step, after the data is converted into a binary format, the binary format data is further compressed in real time by a lossless compression algorithm and then stored into a data storage packet, and in the data restoration display step, after the data storage packet is read, the data is restored into complete binary format data by a decompression algorithm corresponding to the lossless compression algorithm.
3. 3. The method of claim 2, wherein the lossless compression algorithm comprises run-length encoding.
4. 4. A method for compressed storage and restoration of flexible dc valve-regulated data according to claim 1, 2 or 3, wherein in the data compression storage step, original data of high-speed recording data in hexadecimal format is converted and stored according to a protocol definition, and a sampling rate of the original data is not lower than 100kHz.
5. 5. The method of claim 4, wherein the specification is an ini profile defining a data type for each data channel, the data type including 8-bit, 16-bit, 32-bit, signed, unsigned, or floating point data, and the data transfer for each data channel is read according to the ini profile.
6. 6. The method for compressing, storing and restoring flexible direct current valve control data according to claim 4, wherein the data storage packet generated in the data compression storing step comprises a file header and a mapping area, the file header is used for storing meta information of data, the meta information comprises a sampling rate, the number of channels and a data start time, and the mapping area is used for storing compressed binary format data.
7. 7. The method for compressed storage and restoration of flexible direct current valve control data according to claim 6, wherein the mapping area stores specific data in units of logic blocks, each logic block comprises a fixed time length or a fixed number of sampling points, and the data in a specific time period can be conveniently and rapidly located and read later.
8. 8. The method for compressing, storing and restoring flexible direct current valve control data according to claim 4, wherein in the data restoring and displaying step, a user is supported to selectively define a data channel and a time range to be restored, and a file conforming to a COMTRADE standard format is generated.
9. 9. The method for compressing, storing and restoring flexible direct current valve control data according to claim 4, wherein in the data restoring and displaying step, after binary format data is converted into ASCII format, the data is visually displayed in the form of waveform diagram, data list and the like for operation and maintenance personnel to carry out deep analysis.
10. 10. The compression storage and restoration device for the flexible direct current valve control data comprises a memory, a processor and a computer program stored on the memory, and is characterized in that the processor executes the computer program to realize the steps of the compression storage and restoration method for the flexible direct current valve control data according to any one of claims 1-9.

Description

Compression storage and restoration method and device for flexible direct current valve control data Technical Field The invention relates to a compression storage and restoration method and device for flexible direct current valve control data, and belongs to the technical field of flexible direct current transmission of power systems. Background Reliable operation of a flexible dc power transmission system depends to a great extent on its "heart" -the normal operation of the converter valve. The converter valve consists of thousands of Insulated Gate Bipolar Transistors (IGBT), the switching frequency is high, and the electromagnetic transient process of the system is extremely fast (microsecond level). In order to realize accurate control, fault diagnosis and performance analysis of the valve control system, key parameters such as valve arm current, submodule capacitor voltage and the like need to be stored continuously at a sampling rate of up to 100K. When an anomaly or a protective trip occurs in the system, the prestored complete process data can become a core basis for problem analysis. Based on the reliably stored historical data, operation and maintenance personnel can accurately reconstruct the complete sequence of the occurrence of the event, accurately analyze the occurrence time point of the first abnormal signal, verify the execution condition of the control instruction and the correctness of the protection logic, thereby rapidly positioning the fault source and greatly compressing the recovery time of the system. Therefore, in a flexible direct current transmission system, a data transfer mechanism must meet extremely high real-time and reliability requirements. When redundancy switching or instantaneous abnormality occurs in the system, operation and maintenance personnel can immediately acquire and analyze the stored data to accurately judge the state of the system, and support is provided for restarting decision. If the integrity of the data storage or the reading efficiency is insufficient, the best decision timing is missed, which may lead to unnecessary downtime extension, resulting in significant economic loss. However, the amount of data generated at this sampling rate is extremely large, which can pose significant challenges to the capacity of the data storage system, the real-time writing speed, and the subsequent data transfer, reading, and analysis. In the prior art, original data are directly stored or a low-efficiency compression algorithm is adopted, so that the storage space is exhausted, data files are difficult to transmit, the analysis and display speed is slow, and real-time judgment of the system state and rapid diagnosis after faults by operation and maintenance personnel are seriously restricted. Therefore, a data processing method capable of achieving both high-speed real-time storage and fast analysis display is needed. Disclosure of Invention The invention aims to provide a compression storage and restoration method and device for flexible direct current valve control data, which are used for solving the problem of how to consider high-speed real-time storage and quick analysis display of a data transfer mechanism of flexible direct current transmission. In order to achieve the above object, the present invention provides a method comprising: the invention discloses a compression storage and restoration method of flexible direct current valve control data, which comprises the following steps: The data compression and storage step is that high-speed recording data of the flexible direct current valve control system are collected in real time, and the high-speed recording data are converted into binary format and stored into data storage packets for storage; and a data reduction display step, namely reading the data storage package, and converting binary format data in the data storage package into an ASCII code format for analysis and visual display. Further, in the data compression and storage step, after the data is converted into the binary format, the lossless compression algorithm is adopted to compress the binary format data in real time, and the binary format data is stored into a data storage packet; in the data restoration and display step, after the data storage packet is read, a decompression algorithm corresponding to the lossless compression algorithm is further adopted to restore the data into complete binary format data. Further, the lossless compression algorithm includes run-length encoding. Further, in the data compression storage step, original data of the hexadecimal format high-speed wave recording data is converted and stored according to the rule definition, and the sampling rate of the original data is not lower than 100kHz. Further, the protocol is an ini configuration file, the configuration file defines a data type of each data channel, the data type comprises 8-bit, 16-bit, 32-bit, signed, unsigned or floating point data, and the data of e