EAST极向场电源的数据存储及读取方法

王广红; 黄连生; 高格; 傅鹏; 何诗英; 王泽京

doi:10.11884/HPLPB201931.180360

EAST极向场电源的数据存储及读取方法

doi: 10.11884/HPLPB201931.180360

中国科学院等离子体物理研究所, 合肥 230031

详细信息

作者简介:
王广红(1982－), 女，硕士, 工程师，从事电源控制器研究; wgh@ipp.ac.cn

通讯作者:
黄连生(1983－), 男，博士，大功率电源控制、控制系统设计、算法研究、控制系统电磁兼容研究; huangls@ipp.ac.cn

中图分类号: TP273
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- 文章访问数: 998
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- 被引次数: 0
出版历程
- 收稿日期: 2018-12-03
- 修回日期: 2019-02-28
- 刊出日期: 2019-05-15

Research on data storage and reading method of EAST poloidal field power supply

Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China

摘要

摘要: EAST (Experimental Advanced Super-conducting Tokamak)装置的等离子体放电持续时间设计值为1000 s，目前放电长度已超过100 s。极向场电源(PF)是EAST的核心系统，有接近200路信号需要进行数据存储，每一次放电的数据量非常大，普通的数据库不能够满足长脉冲数据存储的要求。本文使用HDF5(Hierarchical Data Format)存储长脉冲数据，HDF5是可以存储不同类型的图像和数码数据的文件格式。本文采用HDF5的C接口，设计复合数据类型的数据集，为了实现实时存储与实时读取，将一次放电时间进行分割，并对数据进行分块存储和读取。通过可视化工具Hdfview查看数据集，以及Qt读取HDF5文件并进行波形显示，证明复合数据类型和分块数据集的正确性，以及分块写入与分块读取的可行性，同时对读写时间进行简单的测试，证明分块写入与分块读取方式具有高效性。
- EAST极向场电源 /
- 长脉冲 /
- HDF5 /
- 复合数据类型 /
- 分块存储与分块读取
Abstract: The plasma discharge duration of EAST (Experimental Advanced Super-conducting Tokamak) is designed to be 1000 s, the time has exceeded 100 s at present. As the core subsystem, poloidal field power supply(PF) has nearly 200 signals to be stored. For every discharge, the amount of data is very large, ordinary database can't meet the requirement of long pulse data storage. This paper uses HDF5 (Hierarchical Data Format) to store the long pulse data. HDF5 is a file format that can store different types of images and data. Using C interface of HDF5 to design a dataset with compound datatype, to realize real-time writing and reading, the primary discharge time is segmented and the data is written and read as chunks. Visualization tool Hdfview is used to view the dataset, and Qt is used to read HDF5 file and display waveform. It proves the correctness of compound datatype and chunk dataset, and the feasibility of writing and reading as chunks. Simple time test proves that writing and reading as chunks are efficient.
- EAST poloidal field power supply /
- long pulse /
- HDF5 /
- compound datatype /
- write and read as chunks

HTML全文

图 1 EAST极向场电源硬件与信号简图

Figure 1. Hardware and signal diagram of EAST poloidal field

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图 2 程序总体框架

Figure 2. Program diagram

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图 3 数据集设计简图

Figure 3. Dataset design diagram

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图 4 复合数据类型创建过程

Figure 4. Creation progress of compound datatype

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图 5 实时数据分块写入

Figure 5. Write the real-time data as chunks

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图 6 分块读取数据

Figure 6. Read the data as chunks

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图 7 分块写数据与分块读取数据占用时间测试

Figure 7. Spent time for writing and reading data as chunks

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图 8 Hdfview工具查看数据集

Figure 8. Check the dataset through Hdfview

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表 1 HDF5部分接口统计

Table 1. Part of HDF5 interfaces

interface	description	functions used in this paper
H5D	datasets interface, create and manipulate dataset objects, and set and retrieve their constant or persistent properties.	H5Dcreate2, H5Dread, H5Dwrite, H5Dopen2, H5Dget_space, H5Dset_extent, H5Dclose, H5Dget_type, H5Dget_create_plist.
H5A	attribute interface, create and manipulate attributes and information about attributes.	H5Acreate2, H5Aopen, H5Aget_space, H5Aread, H5Awrite, H5Aclose.
H5S	dataspace interface, create and manipulate the dataspace in which to store the elements of a dataset.	H5Screate_simple, H5Screate, H5Sget_simple_extent_dims, H5Sget_simple_extent_ndims, H5Sselect_hyperslab, H5Sclose.
H5F	file interface, designed to provide file-level access to HDF5 files.	H5Fcreate, H5Fopen, H5Fclose.
H5T	datatype interface, create and manipulate the datatype which describes elements of a dataset.	H5Tarray_create1, H5Tcreate, H5Tinsert, H5Tget_class, H5Tclose.
H5P	property list interface, manipulate property list objects in various ways, including reset property values.	H5Pcreate, H5Pset_chunk, H5Pset_fill_value, H5Pget_chunk.

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表 2 HDF5本机数据类型和对应C类型

Table 2. HDF5 native type and corresponding C type

HDF5 native type	C type	HDF5 native type	C type	HDF5 native type	C type
H5T_NATIVE_CHAR	char	H5T_NATIVE_ULLONG	unsigned long	H5T_NATIVE_LONG	long
H5T_NATIVE_UCHAR	unsigned char	H5T_NATIVE_DOUBLE	double	H5T_NATIVE_LLONG	long long
H5T_NATIVE_USHORT	unsigned short	H5T_NATIVE_SCHAR	signed char	H5T_NATIVE_FLOAT	float
H5T_NATIVE_UINT	unsigned	H5T_NATIVE_SHORT	short	H5T_NATIVE_LDOUBLE	long double
H5T_NATIVE_ULONG	unsigned long	H5T_NATIVE_INT	int

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