GB/T 40596-2021Technical rules for automatic under-frequency load shedding in electric power systems (English PDF)
电力系统自动低频减负荷技术规定
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
October 11, 2021
Implementation date
May 1, 2022
Scope
GB/T 40596-2021 is the English-translated version of 电力系统自动低频减负荷技术规定.
GB/T 40596-2021 sets the technical rules for automatic under-frequency load shedding in electric power systems.
It gives the principles and requirements for configuring and setting the shedding devices and the assumptions and methods used to calculate the settings, so that when a sudden active power shortage makes the frequency fall, enough load is shed in a planned sequence to avoid prolonged large-scale blackouts and damage to important users.
Beyond the general and basic requirements it covers the setting calculation, the configuration and setting of automatic load shedding and the setting of under-frequency splitting devices, and its annexes describe the management process for the shedding plan and the calculation of frequency dynamics.
It applies to planning and design, operation, research and manufacturing. It was issued on 11 October 2021 and has applied since 1 May 2022.
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Document preview — GB/T 40596-2021
National Standard of the People's Republic of China
- ICS
- 29.020
- Classification
- F 21
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Foreword
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 General requirements
- 5 Basic requirements for automatic low frequency load shedding
- 6 Setting calculation of automatic low frequency load shedding
- 7 Configuration and setting of automatic low frequency load shedding
- 8 Setting of low-frequency splitting device
- Appendix A (informative) Low-frequency load reduction plan management process
- Appendix B (informative) Calculation of dynamic process of frequency change of constant output power generator with concentrated load
- Appendix C (Informative) Calculation of the dynamic process of system frequency changes after the rated value is exceeded
Foreword
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1: Structure and Drafting Rules of Standardization Documents" Drafting.
1 Scope
This document specifies the basic principles and requirements for the configuration and setting of automatic low-frequency load shedding devices for power systems (hereinafter referred to as "systems"). Basic assumptions and methods of automatic low-frequency load shedding calculation.
This document is applicable to the automatic low-frequency load reduction technical measures involved in system planning and design, production operation, and scientific research and manufacturing.
2 Normative references
The contents of the following documents constitute the indispensable clauses of this document through normative references in the text. Among them, dated quotations Only the version corresponding to that date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to this document.
GB/T 15945 Power quality power system frequency deviation
GB/T 31464 Grid Operation Guidelines
GB 38755 Safety and Stability Guidelines for Power Systems
3 Terms and definitions
The following terms and definitions defined in GB/T 15945, GB/T 31464 and GB 38755 apply to this document.
3.1 Load power
The size of the load when the system is running.
3.2 Remaining power generation
The total amount of generating power still running in the system after the occurrence of active power shortage.
3.3 Nominal frequency
The nominal frequency selected by the system design.
3.4 Frequency collapse
A serious system accident caused by a vicious drop in frequency.
4 General requirements
4.1 The system should reasonably arrange the sequence of automatic low-frequency load shedding and the amount of load shedding. When the whole system or the partial power shortage after splitting At the same time, a sufficient amount of load should be automatically subtracted according to the frequency drop in a planned way, so as to avoid long-term large-scale blackouts and damage to important users.
Catastrophic power outages (including plant power) minimize load loss as much as possible.
4.2 When the system's active power shortage suddenly occurs and the system frequency is severely reduced, the action of the automatic low-frequency load shedding device should be relied on to make The load capacity reserved for operation is compatible with the generating capacity in operation. In view of the combination of system generator sets (thermal power, hydropower, nuclear power, gas turbine […]
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Referenced standards
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Related Standards
GB 38755-2019 — Code on security and stability for power system
GB/T 15945-2008 — Power quality - Frequency deviation for power systems
GB/T 31464-2022 — The grid operation code
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GB/T 40596-2021
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