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This standard is developed in accordance with the rules given in GB/T 1.1-2009.
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This standard was proposed by the China Electricity Council (CEC).
This standard is under the jurisdiction of National Technical Committee 550 on Electric Energy Storage of Standardization Administration of China (SAC/TC 550).
Operation performance index and evaluation of electrochemical energy storage station
1 Scope
This standard specifies the contents and statistical methods of operation performance index of electrochemical energy storage station, as well as the principles and requirements of its operation effect evaluation.
This standard is applicable to electrochemical energy storage stations with rated power not less than 500 kW and rated energy not less than 500 kW·h. As for energy storage power stations of other scales, this standard may be used as a reference.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 36558 General technical requirements for electrochemical energy storage system in power system
DL/T 1815 Code for reliability evaluation of electrochemical energy storage station equipment
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
electrochemical energy storage station
station, with the electrochemical battery as an energy storage element, capable of power storage, conversion and discharge, which consists of several different or the same type of electrochemical energy storage systems
Note: Besides the energy storage system, it also includes facilities for grid connection, maintenance, overhaul, etc.
3.2
electrochemical energy storage system
station, with the electrochemical cell as a carrier for energy storage, capable of recyclable power storage and discharge via power converter
Note: It generally includes battery system, power conversion and related auxiliary facilities. For electrochemical energy storage systems connected to a grid with voltage class of 10(6) kV and above, they usually include pooling lines, step-up transformers, etc.
3.3
electrochemical energy storage unit
minimum energy storage system consisting of electrochemical batteries, connected power conversion system and a battery management system and capable of power storage and discharge independently
3.4
rated power of energy storage station
sum of rated powers of each energy storage unit in the station
3.5
rated energy of energy storage station
sum of rated energies of each energy storage unit in the station
3.6
on-grid energy
electric energy delivered to the grid by the electrochemical energy storage station
3.7
off-grid energy
electric energy received from the grid by an electrochemical energy storage station
3.8
rate of energy lose for energy storage system
during the operation of energy storage system, ratio of electric energy loss to the off-grid energy of the energy storage station, of which, the loss includes the electric energy loss during battery charging, energy storage and discharge, and that of power conversion system
3.9
rate of energy lose for power distribution and transmission
ratio of the electric energy loss to the off-grid energy of the energy storage station during the operation of the power transmission and transformation equipment supporting the energy storage system in the energy storage station
3.10
success rate of power grid dispatching response
ratio of the actual successful execution times of the power grid dispatching instructions by the energy storage station to the number of instructions issued in a certain period
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3.11
operation and maintenance cost
direct cost caused by manpower and material resources invested to the energy storage station to realize its safe and stable operation, normal power charging and discharging and energy storage functions, mainly including repair costs, material costs, electricity purchase costs and salaries paid to production management personnel
4 General
4.1 An electrochemical energy storage station (hereinafter referred to as “energy storage station”) shall be subjected to regular operation evaluation after it has passed the completion acceptance and been handed over formally for production and management and its production, operation and maintenance are normal.
4.2 The energy storage station should be evaluated annually.
4.3 During the operation evaluation, the energy storage station shall be evaluated on its operation status and effect based on its basic information and operation data collected comprehensively according to the statistical results of the main technical and economical indexes.
4.4 Data of the energy storage station such as basic information and operation data mainly include:
a) type of energy storage battery, rated power and energy of energy storage unit, system structure, etc.;
b) voltage grade, main electrical wiring, main equipment model and parameters, auxiliary power system, etc. of power transformation and distribution facilities;
c) structure and main monitoring items of the station monitoring system and battery management system;
d) operation data, such as power, voltage, current and energy, of the station and energy storage unit; power system dispatching records of the station;
e) operation failure and maintenance records of the station and its energy storage unit;
f) operation and maintenance cost.
4.5 The time period of operation data collected before the operation evaluation of the energy storage station shall be consistent with the evaluation period.
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4.6 Gauges and meters involved in the operation evaluation of the energy storage station shall have calibration qualified records.
4.7 Technical requirements for the equipment of the energy storage station shall comply with GB/T 36558.
5 Operation performance index of energy storage station
5.1 Energy indexes
5.1.1 General requirements
5.1.1.1 Energy indexes shall include on-grid energy, off-grid energy, auxiliary power consumption, utilization hours, equivalent utilization factor, and charging and discharging energy of energy storage units.
5.1.1.2 The off-grid energy of the energy storage station shall be equal to the sum of on-grid energy, auxiliary power consumption, and energy lose for both energy storage system and supporting power transmission and transformation facilities.
5.1.2 On-grid energy and off-grid energy of the station
5.1.2.1 The on-grid energy shall be the sum of the energy delivered by the energy storage station to the grid during the evaluation period; the off-grid energy shall be the sum of the energy received by the energy storage station from the grid during the evaluation period.
5.1.2.2 Both on-grid energy and off-grid energy shall be measured using the tariff gauge/meter between the energy storage station and the grid.
5.1.3 Auxiliary power consumption
The auxiliary power consumption shall be the total energy consumed by the monitoring system, lighting system, power system, HVAC, etc. to maintain the operation of the energy storage station during the evaluation period. It can be measured using the gauges and meters in the auxiliary power circuit through the monitoring system.
5.1.4 Utilization hours of the station
To obtain the operation hours of the energy storage station, the operation hours of each energy storage unit during the evaluation period shall be collected, weighted according to the rated power of each energy storage unit to get the mean and calculated using Formula (1):
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 General
5 Operation performance index of energy storage station
6 Operation evaluation of energy storage station
Annex A (Informative) Statistical report on operation performance index of an electrochemical energy storage station
