GB/T 40609-2021 English PDF (GBT40609-2021)

Delivery: 3 seconds. Download true-PDF + Invoice.
Get QUOTATION in 1-minute: Click GB/T 40609-2021
Historical versions: GB/T 40609-2021
Preview True-PDF (Reload/Scroll if blank)

GB/T 40609-2021: Technical specifications for operational security checking of power system
GB/T 40609-2021
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 29.020
CCS F 21
Technical specifications for operational security checking of
power system
ISSUED ON: OCTOBER 11, 2021
IMPLEMENTED ON: MAY 01, 2022
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Terms and definitions ... 4 
4 General requirements for operational security check for power system ... 5 
5 Power flow calculation of power grid operational mode ... 5 
6 Operational security check for power system ... 7 
7 Decision making for security check ... 11 
Technical specifications for operational security checking of
power system
1 Scope
This document specifies the data input and output, calculation content and calculation
requirements for operational security checking of power system.
This document applies to the day-ahead and intra-day operational security checking of
power system, and guides the design, research, development and acceptance of the
security check for power system at the provincial level and above. The power
generation, transmission and supply enterprises and users at all levels shall refer to it
for implementation.
2 Normative references
The following documents are normatively referenced in this document and are
indispensable for its application. For dated references, only the version corresponding
to that date is applicable to this document; for undated references, the latest version
(including all amendments) is applicable to this document.
GB 38755, Code on security and stability for power system
DL/T 961, Power grid dispatching glossary
3 Terms and definitions
Terms and definitions determined by DL/T 961 and the following are applicable to this
document.
3.1 Operational security check for power system
Security check carried out for the day-ahead and intra-day dispatching plans and
electricity market transactions during the generation and operation of power grid
dispatching.
Note: The check contents include base state power flow check, steady-state security
check, short-circuit current check, short-circuit ratio check and stability check.
3.2 Steady-state security check
According to the operational mode data for power system, apply the N-1 principle and
the specified fault set to disconnect the lines, transformers and other elements without
fault one by one, and check whether other elements have equipment overload and
voltage out-of-limit.
3.3 Stability check
Evaluate the ability of the power system to maintain stable operation after small
disturbances and large disturbances based on the operational mode data for power
system.
3.4 Decision making for security check
According to the calculation results of security check, for unsecure or unstable
operational mode data for power system, provide sensitivity analysis information and
adjustment suggestions for eliminating various security and stability problems.
4 General requirements for operational security check for
power system
In the power grid dispatching production and operation, the day-ahead and intra-day
dispatching plan and the electricity market translation results shall pass the security
check. For the situation where the security and stability requirements of the power
system are not satisfied, adjustment suggestions shall be given.
5 Power flow calculation of power grid operational mode
5.1 Basic data
5.1.1 Obtain maintenance plan, power generation plan, electricity market transaction,
equipment unplanned outage or abnormal outage information, and combine new energy
power generation forecast, system load forecast and bus load forecast to provide a
computational basis for subsequent calculations.
5.1.2 The basic calculation data for security check shall include:
a) forecast data, including bus load forecast, system load forecast, and new energy
power generation forecast;
b) dispatching plan data, including power generation plan, tie line plan, equipment
maintenance plan;
c) equipment unplanned outage or abnormal outage information;
d) electricity market transaction data.
5.4.3 The power flow calculation shall automatically adjust the reactive power
compensation according to the change of the active power, so as to ensure that the
voltage of each central point in the system meets the specified requirements:
a) The converter station filter shall be automatically switched on and off according
to the DC active power;
b) Active power and voltage amplitude given (PV) node voltage can be determined
according to historical operational data or manual experience;
c) The reactive power of active power and reactive power given (PQ) nodes shall be
set with reference to historical operational data;
d) The grid reactive power shall be adjusted with the load changes – based on the
principle of lay-dividing and zone-dividing and on-site balance – to avoid the
transmission of reactive power through long-distance lines or multi-stage
transformers.
5.5 Input and output
5.5.1 The input data of the power flow calculation of power grid operational mode shall
include:
a) load forecast and new energy power generation forecast data, dispatching plan
data, equipment unplanned outage or abnormal outage information and electricity
market transaction data;
b) grid model;
c) historical power grid operational data.
5.5.2 The results of the power flow calculation of power grid operational mode shall
include the power grid operational mode data converged by the power flow calculation.
6 Operational security check for power system
6.1 Base state power flow check
6.1.1 The base state power flow check shall perform statistical analysis on the
operational mode data for power system, to judge the overload and out-of-limit
conditions of equipment under the base state power flow.
6.1.2 The base state power flow check includes the following contents:
a) It shall compare the operational mode data for power system with the equipment
limit for out-of-limit check, including line current out-of-limit, transmission
section power flow out-of-limit, transformer power flow out-of-limit and bus
voltage out-of-limit;
b) It shall provide overload equipment and its overload degree, out-of-limit
equipment and its out-of-limit degree, and shall sort the equipment according to
the overload degree and out-of-limit degree.
6.1.3 The input data of the base state power flow check calculation shall include:
a) operational mode data for power system;
b) equipment limit, including line current limit, transmission section composition
and stability limit, transformer power flow limit and bus voltage limit.
6.1.4 The calculation results of base state power flow check shall include: overload and
out-of-limit equipment and overload and out-of-limit degree of operational mode data
for power system under base state power flow.
6.2 Steady-state security check
6.2.1 The steady-state security check shall perform steady-state security analysis and
calculation for the operational mode data of power system, and analyze the equipment
overload and out-of-limit conditions under the N-1 fault and the specified fault set.
6.2.2 The steady-state security check includes the following contents:
a) The calculation range of steady-state security check can be determined according
to equipment type, vol...