GB/T 34120-2017 (GB/T 34120-2023 Newer Version) PDF English
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Technical requirements for power conversion system of electrochemical energy storage system
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GB/T 34120-2017: PDF in English (GBT 34120-2017) GB/T 34120-2017
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 27.180
F 19
Technical specification for power conversion system
of electrochemical energy storage system
ISSUED ON: JULY 31, 2017
IMPLEMENTED ON: FEBRUARY 01, 2018
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine;
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 ... 5
4 Product classifications ... 7
5 Technical requirements ... 8
6 Inspection ... 18
7 Marks, packaging, transport, storage ... 19
Annex A (informative) Technical parameters of power conversion system ... 22
Annex B (informative) Selection of anti-island protection plan ... 24
Technical specification for power conversion system
of electrochemical energy storage system
1 Scope
This Standard specifies relevant terms and definitions, product classification,
technical requirements, inspection rules, marks, packaging, transport, storage
for AC-DC-converting-type three-phase power conversion system of
electrochemical energy storage system.
This Standard is applicable to low-voltage three-phase power conversion
system that uses electrochemical cell as energy storage carrier. The maximum
value of the DC-side voltage does not exceed 1000 V.
NOTE: The power conversion system used by other type energy storage system such as
super capacitor may refer to this Standard.
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 191, Packaging and storage marks
GB/T 2423.3, Basic environmental testing procedures for electric and
electronic products - Test Cab: Damp heat, steady state
GB/T 2423.4, Environmental testing for electric and electronic products - Part
2: Test method - Test Db: Damp heat, cyclic ( 12h+12h cycle)
GB/T 3859.2, Semiconductor converters - General requirements and line
commutated converters - Part 1-2: Application guide
GB/T 4208, Degrees of protection provided by enclosure (IP code)
GB/T 7251.1, Low-voltage switchgear and control gear assemblies - Part 5:
Particular requirements for assemblies for power distribution in public
networks
GB/T 12326, Power quality - Voltage fluctuation and flicker
3.3 power conversion system; PCS
a converter that, in electrochemical energy storage system, is connected
between battery system and grid (and/or load) to realize bidirectional
conversion of power
3.4 converter efficiency
the ratio of output active power to input active power of power conversion
system, represented in a percentage; where, when grid stores power to battery
module, the ratio of DC-side output active power to AC-side input active power
is efficiency of rectification; when battery module releases power to grid, the
ratio of AC-side output active power to DC-side input active power is inverter
efficiency
3.5 grid mode
an operation mode that power conversion system is simultaneously integrated
into AC grid, operating in current source characteristics, storing grid power into
battery module or feedbacking battery module energy to grid
3.6 islanded mode
an operation mode that power conversion system operates in current source
characteristics so as to provide power supply to grid that is connected to AC-
side of energy storage system
3.7 transfer time between charge and discharge
the time required by energy storage system to switch between charging state
and discharging state; it usually refers to the average value when it switches
from 90% rated power charging state to 90% rated power discharging state
AND from 90% rated power discharging state to 90% rated power charging
state
3.8 stabilized current precision
the stability of DC-side output current of power conversion system when
electrochemical energy storage system is under constant current working state,
when DC-side output current of power conversion system remains stable at any
value within its rated range
3.9 stabilized voltage precision
the stability of DC-side output voltage of power conversion system when
electrochemical energy storage system is under constant voltage working state,
when DC-side output current of power conversion system varies within its rated
value, when output voltage remains stable at any value within adjustable range
Rated power level of power conversion system (kW) prefers the following series:
30, 50, 100, 200, 250, 500, 630, 750, 1000, 1500, 2000.
5 Technical requirements
5.1 Conditions of use
5.1.1 Environmental conditions for normal use
Power conversion system shall work under the following environmental
conditions:
a) working environment temperature: -20°C ~ +45°C;
When environment temperature exceeds the maximum value specified by
environmental conditions for normal use (but not more than 15°C at the
most), in order to make power conversion system operate safely, use
according to the provisions of GB/T 3859.2;
b) relative humidity of air ≤95%;
c) altitude is ≤1000 m; when altitude is >1000 m, use according to the de-
rate specified in GB/T 3859.2;
d) air shall not contain excessive dust, acid, alkali, corrosive and explosive
particles and gases;
e) no severe vibration shock, vertical inclination is ≤5°.
5.1.2 Electrical conditions for normal use
If there are no other regulations, the power conversion system that complies
with this document, under the following grid conditions, shall be able to operate
in the normal way:
a) the harmonic voltage shall not exceed the limit specified in GB/T 14549;
b) the three-phase voltage imbalance shall not exceed the limit specified in
GB/T 15543;
c) the frequency deviation shall not exceed the limit specified in GB/T 15945;
d) the voltage deviation shall be in the range of -10% ~ +15%.
NOTE: When the voltage change within a short time exceeds the specified value, it might
cause work interruption or trip. If continuous work is required, user and manufacturer shall
negotiate.
system, under 120% rated current, shall continuously run not less than 1 min.
5.4.4 Total harmonic distortion rate of current
When power conversion system is under rated grid operation conditions, total
harmonic distortion rate of AC-side current shall comply with the provisions of
GB/T 14549.
5.4.5 DC component
When power conversion system is running at rated power, DC component in
AC-side current of power conversion system shall not exceed 0.5% of rated
value of its output current.
5.4.6 Voltage fluctuation and flicker
The voltage fluctuation and flicker that are produced when power conversion
system is accessed to grid shall comply with the provisions of GB/T 12326.
5.4.7 Power control precision
When power conversion system output is greater than 20% of its rated power,
the power control precision shall not exceed 5%.
5.4.8 Power factor
Under grid mode, when not involving in system’s reactive power adjustment,
when power conversion system output is greater than 50% of its rated output,
average power factor shall not be less than 0.98 (leading or lagging).
5.4.9 Stabilized current precision and current ripple
When power conversion system is under constant current working state,
stabilized current precision of output current shall not exceed ±5%; current
ripple shall not exceed 5%.
5.4.10 Stabilized voltage precision and voltage ripple
When power conversion system is under constant voltage working state,
stabilized voltage precision of output voltage shall not exceed ±2%; voltage
ripple shall not exceed 2%.
5.4.11 Grid adaptability
5.4.11.1 Frequency response
Frequency response shall meet the following requirements:
a) power conversion system that is integrated into 380V distribution network,
5.4.12.2 Dynamic reactive supporting ability
When voltage falls due to short-circuit failure of power system, dynamic reactive
current of power conversion system of electrochemical energy storage system
that is injected into grid shall meet the following requirements:
a) since the moment when voltage of grid point falls, the response time of
dynamic reactive current shall not be greater than 30 ms;
b) during the time from dynamic reactive current responses till voltage
recovers to 0.85 (p.u.), dynamic reactive current of power conversion
system that is injected into power system shall track voltage changes of
grid point in real time, and shall satisfy:
Where,
UT - per unit value of grid point voltage of power conversion system;
IN - rated current of power conversion system.
5.4.13 Transfer time between charge and discharge
Transfer time between charge and discharge of power conversion system shall
not be greater than 100 ms.
5.4.14 Voltage deviation
Under conditions of no-load and rated resistive load (balanced load), amplitude
deviation of AC-side output voltage of power conversion system shall not
exceed ±5% of rated voltage, and phase deviation shall be less than 3°.
5.4.15 Total harmonic distortion rate of voltage
Under conditions of no-load and rated resistive load (balanced load), total
harmonic distortion rate of AC-side output voltage of power conversion system
shall not exceed 3%.
5.4.16 Voltage imbalance
Output voltage imbalance of power conversion system shall be less than 2%,
not exceeding 4% in short time.
5.4.17 Dynamic voltage transient range
a) Alternating moist-heat
After testing according to GB/T 2423.4, measure its insulation resistance
which shall not be less than 0.5 MΩ. Medium strength shall not be less
than 75% of voltage value of medium strength test specified in GB/T
2423.4.
b) Constant moist-heat
After testing according to GB/T 2423.3, measure its insulation resistance
which shall not be less than 0.5 MΩ. Medium strength shall not be less
than 75% of voltage value of medium strength test specified in GB/T
2423.3.
5.5 Protection function
5.5.1 Short-circuit protection
Power conversion system shall set short-circuit protection function.
5.5.2 Reverse polarity protection
Power conversion system shall set reverse polarity protection function.
5.5.3 DC over-voltage / under-voltage protection
Power conversion system shall set DC over-voltage / under-voltage protection
function.
5.5.4 Islanded over-current protection
Power conversion system shall set islanded over-current protection function.
5.5.5 Over-temperature protection
Power conversion system shall set over-temperature protection function.
5.5.6 AC incoming phase sequence error protection
Power conversion system shall set AC incoming phase sequence error
protection function.
5.5.7 Communication failure protection
Power conversion system shall set communication failure protection for
monitoring system, battery management system.
5.5.8 Cooling system failure protection
Radiation immunity of radio frequency electromagnetic field shall meet
requirements for test level 3 of GB/T 17626.3-2006: test field strength is 10 V/m.
Test results shall meet requirements for category a in GB/T 17626.3-2006.
5.8.4 Surge (impact) immunity
Apply 1.2/50 μs surge signal to power port. Test level is line-to-line ±1 kV, line-
to-ground ±2 kV. Test results shall meet requirements for category b in Clause
9 of GB/T 17626.5-2008.
5.8.5 Conducted disturbance immunity of RF field induction
Conducted disturbance immunity shall meet requirements for test level 3 in
GB/T 17626.6-2008. Test results shall meet requirements for category a in GB/T
17626.6-2008.
5.8.6 Requirements for emission
Electromagnetic emission of a normal-working power conversion system shall
not exceed emission limit specified in GB 17799.4.
5.9 Enclosure protective level
In accordance with GB/T 4208. Protective level shall not be lower than IP20.
6 Inspection
6.1 Type test
Type test shall be conducted in one of the following cases:
a) test stereotypes identification of new product or old product conversion
production;
b) great changes in design, technique or material used may affect product
performances;
c) when production is resumed after the production has been discontinued
for a long time;
d) when the results of the exit-factory test and the previous type test are quite
different;
e) when user has special requirements and it is agreed by manufacturer.
When testing, if each product has one rejected item, it is allowed to rework and
retest. If retest still fails, this batch of products shall be determined as rejected.
7.1.1 Product marks
Power conversion system shall have obvious marks. It shall ensure nameplate
writing is not easy to wear out throughout the period of use. Nameplate shall be
placed in a prominent position. It shall contain the following information:
a) product name, model, trademark or product code;
b) main technical parameters of product:
1) rated power (kW);
2) working range of DC-side voltage (V);
3) AC-side rated voltage (V);
4) overload capability;
5) protective level;
6) manufacturing basis (standard number).
c) exit-factory number;
d) date of manufacture (batch number);
e) manufacturer name, factory address;
f) years of use.
7.1.2 Packaging marks
On outer packaging of power conversion system, there shall be receiving-
delivery marks, packaging-storage marks and warning marks, in accordance
with relevant provisions of GB/T 191.
7.2 Packaging
7.2.1 Technical documents supplied with product
The supplied technical documents include:
a) packing list;
b) product use and maintenance instructions;
c) installation manual;
d) product quality certificate;
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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