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IEEE P1159.3
Recommended Practice
for a
Power Quality Data Interchange Format
An Extensible File Format for the Exchange
of
Power Quality
Measurement and Simulation Data
Sponsored by
Standards Coordinating Committee 22 (Power Quality)
Draft 1.5
January 1999
Copyright 1999 by the Institute of Electrical and Electronic Engineers, Inc.
345 East 47th Street
New York, NY 10017, USA
All rights reserved.
This is an unapproved draft of a proposed IEEE Standard, subject to change. Permission
is hereby granted for IEEE Standards Committee participants to reproduce this document
for purposes of IEEE standardization activities. Permission is also granted for member
bodies and technical committees of ISO and IEC to reproduce this document for purposes
of developing a national position. If this document is to be submitted to ISO or IEC,
notification shall be given to the IEEE Copyright Administrator. Other entities seeking
permission to reproduce this document for these or other uses, must contact the IEEE
Standards Department for the appropriate license. Use of information contained in this
unapproved draft is at your own risk.
IEEE Standards Department
Copyright and Permissions
445 Hoes Lane, P.O. Box 1331
Piscataway, NJ 08855-1331, USA
Page 2 IEEE P1159.3 - Draft 1.5 - January 1999
Copyright 1999 IEEE. All rights reserved.
This is an unapproved IEEE Standards Draft, subject to change.
Introduction
(This introduction is not part of IEEE P1159.3 - A Recommended Practice for a Power
Quality Data Interchange Format.)
The current version of this documentation and related information (header files, sample
code, etc.) can be found at URL:
http://grouper.ieee.org/groups/1159/3/docs.html
For additional support, questions, or suggestions, please send an e-mail to
pqdif@electrotek.com.
The Working Group on Developing a Power Quality Data Interchange Format, which
undertook the development of this recommended practice, had the following
membership:
Scott Peele, Chair
David Kreiss, Secretary
Erich W. Gunther, Technical Editor
Working Group Members
John Csomay
Randy Collins
Larry Conrad
Vladimir Basch
Roger Bergeron
Daniel Brooks
Arshad Mansoor
Ram Mukerji
Dan Nordel
Greg Olsen
Greg Rauch
Richard Bingham
Surya Santosa
Van Wagner
James Wikston
Charlie Williams
Cheri Warren
Rajaie Abu-Hashim
Mike Bridgewood
Richard Brown
James Crane
Fouad Dagher
Behnam Danai
Joe Enk
Stan Fabinwski
Gil Hensley
Mark Kempker
Ajay Koliwad
Jeff Lamoree
Larry Morgan
Allen Morinec
David Mueller
Tamara Ottersetter
Pragasen Pillay
Brian Prokuda
V. Rajagopalan
Larry Ray
Dan Sabin
Peter Shah
Linh Tu
David Vannoy
Marek Waclawiak
Steve Whisenant
Page 3 IEEE P1159.3 - Draft 1.5 - January 1999
Copyright 1999 IEEE. All rights reserved.
This is an unapproved IEEE Standards Draft, subject to change.
The following individuals provided substantial contributions to the development of this
recommended practice:
Core Documents
Erich W. Gunther
Robert F. Scott
Bill Dabbs
Independent Review
Dr. Baran
Daniel Brooks
Example Software
Robert F. Scott
Erich W. Gunther
Jack King
Page 4 IEEE P1159.3 - Draft 1.5 - January 1999
1. Introduction
1.1. Scope
Develop a recommended practice for a file format suitable for exchanging power quality related
measurement and simulation data in a vendor independent manner. Appropriate definitions and event
categories to be developed by other task forces under SC22 and The Working Group on Power Quality
Monitoring.
1.2. Purpose
A variety of simulation, measurement and analysis tools for power quality engineers are now available
from many vendors. Generally, the data created, measured, and analyzed by these tools are incompatible
between vendors. The proposed file format will provide a common ground that all vendors could export to,
import from to allow the end user maximum flexibility in choice of tool and vendor.
1.3. The PQDIF structure
There are two “layers” to the PQDIF format: The physical layer and the logical layer. The physical layer
describes the physical structure of the file without regard to what will actually be stored in it. It uses tags to
identify particular elements of the file. This is similar in concept to TIFF (Tagged Image File Format), used
for storing images.
The logical layer uses the structure defined by the physical layer; it specifies specific tags to use when
building up elements in the file.
The physical layer is based on:
• Specific “physical” data types (INT1, INT2, INT4, REAL4, REAL8, etc.) for portability; and
a specific list of IDs for physical representation (ID_SERIES_PHYS_TYPE_INTEGER1,
etc.)
• 4-byte alignment for efficient processing
• Tags—using GUIDs (Globally Unique Identifiers)—for unique identification of elements
(hereafter called “tags”)
The logical layer is based on:
• Specific lists of tags to identify elements of a file
• A hierarchy of tags and expected physical types
• Extensibility using user-defined tags for private data
• Extensibility of the standard format using tags defined in the future
To keep things simple, many elements in the logical layer are based on an explicit list of enumerated IDs,
such as:
• Vendor list (ID_VENDOR_BMI, ID_VENDOR_BPA, etc.)
• Equipment list (ID_EQUIP_BMI_7100, ID_EQUIP_BMI_8010, etc.)
• Phase (ID_PHASE_AN, ID_PHASE_BN, etc.)
• IEEE 1159 disturbance category (ID_1159_TRANSIENT, ID_1159_SHORTDUR, etc.)
• High-level quantity type (ID_QT_WAVEFORM, ID_QT_RMS, etc.)
• Series quantity units (ID_QU_TIMESTAMP, ID_QU_VOLTS, ID_QU_AMPS, etc.)
• Series value type (ID_SERIES_VALUE_TYPE_MIN, ID_SERIES_VALUE_TYPE_MAX,
etc.)
1.4. Other recommended reading
Once you understand the physical and logical formats of PQDIF, you will still need some guidelines on
how to use it to represent real-world data. Please refer to the annex: Implementing PQDIF and PQDIF
Modeling Guide for more the standard ways to represent various types of data.
物理层描述了文件的物理结构,不关心实际存储的东西。使用标签识别元素。
4字节对齐,提升处理效率
标签使用GUID标识元素
简单起见,逻辑层的许多元素基于枚举类型的ID
附录
Page 5 IEEE P1159.3 - Draft 1.5 - January 1999
2. Physical structure
2.1. Overall file structure
2.1.1. Standard PQDIF flat file
The file is made up of a series of records that are arranged in a linked list. These links are provided by an
absolute link (absolute file offset or position) in the header of the records. This allows new records to be
inserted, and old records to be deleted.
Record 1
Record 2
…
Record 3
Record n
Figure 1 -- Standard record linkages
For the records shown in Figure 1, the order of the records is Record 1, Record 2, Record 3 … Record n.
Record 1
Record 2
…
Record 3
Record n
Record 2B
Figure 2 -- Inserting a new record
After the operation in Figure 2, the order of the records is now Record 1, Record 2, Record 2B, Record 3 …
Record n.
记录组成一个链表。链接指针是绝对地址,保存在记录
的头部。这样可以方便插入和删除记录。
插入记录
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