GB/T 36544-2018Proton exchange membrane fuel cell power supply systems for distribution substations (English PDF)

5.2 System technical requirements

5.2.1 General safety requirements The proton exchange membrane fuel cell power supply system (hereinafter referred to as "system") shall meet the requirements specified in GB/T 27748.1 and GB/T 27748.3.

5.2.2 Appearance and structure The appearance and structure of the system shall meet the following requirements:

--- The appearance of the system shall be clean, without mechanical damage, and the interface contacts shall not be rusted;

--- The surface of the system shall have product identification, and the identification shall be clear;

--- The communication interface, power supply interface, dry contact interface, hydrogen interface, etc. of the system shall be clearly marked.

5.2.3 DC power supply capability

5.2.3.1 DC bus output voltage The maximum variation range of the DC bus output voltage shall be 90% ~ 110% of the nominal voltage of the DC system.

5.2.3.2 Fault discharge capacity After the system completes the discharge for the specified time under the rated power, the switching-on impulse discharge test is carried out, and the impulse current is superimposed 8 times to simulate the fault current. During the three switching-on impulse discharge tests, the output voltage of the DC bus shall be no lower than 90% of DC nominal voltage.

5.2.4 Startup/shutdown mode The system shall have the following startup/shutdown mode:

--- Manual startup/shutdown;

--- Remote start/shutdown;

--- Auto start/shutdown.

5.2.5 System standby power consumption The standby power consumption of the system shall be no greater than 1% of the rated output power of the system. NOTE: The power consumption of the fuel cell electric heating part is excluded.

5.2.6 Overload capability When the output is 110% of the rated power, the system shall be able to run normally for 10min.

5.2.7 Initial power generation efficiency of the system When the system outputs the rated power, the initial power generation efficiency of the system shall be no less than 35%.

5.2.8 Continuous running time Under the rated power, the continuous operation time of the system shall be no less than 10h; and the instantaneous fluctuation of the output voltage of the DC bus shall be no lower than 87.5% of the nominal voltage of the index.

5.2.9 Protection and alarm function

5.2.9.1 Overload protection When the output exceeds the rated power, the system shall be able to issue an alarm signal. When the system is in:

--- the output is between 100% and 110% of the rated power, it lasts for 10min; or

--- the output exceeds 110% of the rated power, it lasts for 3s. The power conversion unit shall automatically enter the output current limiting protection state,

--- Telemetry: DC bus output voltage, fuel cell system output current, hydrogen supply pressure, fuel cell temperature, ambient temperature;

--- Remote signaling: fuel cell (cell stack/module output over/under voltage, over- temperature, output over-current), fuel cell operation with low/high hydrogen pressure, low/high ambient temperature, hydrogen leakage;

--- Remote control: system on/off.

5.2.11 System noise The noise during normal operation of the system shall be no greater than 65dB.

5.2.12 Insulation resistance The system insulation resistance shall meet the requirements of

5.3.2 in GB/T 19826-2014.

5.2.13 Dielectric strength The system medium strength shall meet the requirements of

5.3.3 in GB/T 19826-2014.

5.2.14 Damp and heat resistance The damp and heat resistance of the system shall meet the requirements of

5.3.6 in GB/T 19826- 2014.

5.2.15 Protection class The protection level of the system should be no lower than IP20.

5.2.17 Electromagnetic compatibility requirements

5.2.17.1 Immunity requirements The system immunity shall comply with the provisions of

5.4.1 in GB/T 19826-2014.

5.2.17.2 Electromagnetic emission limit requirements The electromagnetic emission limit requirements refer to radiated emission limit requirements. The radiation emission limit value of the system shall comply with the provisions of Table 12 in GB/T 19826-2014.

5.2.18 System life requirements After the system has been running for 1500 hours, it can start normally and output rated power. The output voltage of the DC bus shall meet the requirements of 5.2.3.1.

6.1 Preparation before the test

6.1.1 Test instruments, equipment and requirements See Appendix A for the test instruments and equipment. The accuracy requirements of the instruments and equipment are as follows:

--- The accuracy of the instrument for measuring voltage shall be no less than ±1% (F.S.);

--- The accuracy of the instrument for measuring current shall be no less than ±1% (F.S.);

--- The accuracy of the instrument for measuring time shall be no less than 1s/h;

--- The accuracy of the instrument for measuring temperature shall be no less than ±1°C;

--- The current of the constant current source is adjustable, and the relative change of its current shall be within the range of ±1% (F.S.) during the constant current charging or discharging process;

--- The voltage of the constant voltage source is adjustable, and the voltage change shall be within the range of ±1% (F.S.) during the constant voltage charging process.

6.1.2 Test environmental conditions Unless otherwise specified, the tests in this Standard shall be carried out under the following conditions:

a) Temperature: 25°C±5°C;

b) Relative humidity: no more than 75%;

c) Atmospheric pressure: 86kPa~106kPa.

6.1.3 Test circuit block diagram The test circuit block diagram is shown in Figure 2. current for a duration of 500ms. During this period, the voltage value of the DC (power) bus is measured (the test position is shown in Figure 2); and then resumes operation under the rated current condition;

c) Repeat Procedure

b) for 3 times with 2s interval each time.

6.10 Protection and alarm function test

6.10.1 Overload protection test Adjust the linear load so that the load power is between 100% and 110%. After running for 10 min, the output power of the system shall be reduced to the rated power, or the load power shall be greater than 110%. After 3s, the output power of the system shall be reduced to the rated power. The system shall have an alarm signal.

6.10.2 High-and-low hydrogen pressure protection test at the inlet of the cell stack When the hydrogen pressure at the inlet of the cell stack falls below the minimum pressure value specified by the manufacturer or rises above the maximum pressure value specified by the manufacturer, an alarm signal shall be issued and an automatic shutdown protection shall be realized.

6.10.3 Output over-and-under voltage protection test When adjusting the output voltage of system to exceed the output overvoltage protection setting value or be lower than the output undervoltage protection setting value, an alarm signal shall be issued.

6.10.4 Output short-circuit protection test In the normal operation state of the system, after the auxiliary energy storage module is removed, make the output of the power conversion unit short-circuited; and the short-circuit resistance shall be no greater than 80mOmega. The system shall be able to send an alarm signal and automatically enter the protection state. After the fault is eliminated and the auxiliary energy storage module is switched in, it shall be able to automatically resume work.

6.10.5 Over-temperature protection test When the temperature of the cell stack reaches the over-temperature protection setting value (provided by the cell stack manufacturer, generally between 50 °C and 100 °C), an alarm signal shall be issued and an automatic shutdown protection should be realized.

6.10.6 Hydrogen leak test Carry out the test according to the method specified in

5.2.1 of GB/T 31036-2014.

6.10.7 Alarm information Simulate system failure; check the alarm information of the system; and check whether the alarm signal is transmitted to the near-end and remote monitoring equipment through the communication interface or wireless network, short message, etc.

6.11 Monitoring function test The test shall be carried out according to the following procedures:

a) Check whether the system has standard communication interfaces such as RS232, RS485/RS422, TCP/IP and/or various alarm signal output terminals;

b) Check the content of system telemetry, remote signaling and remote control according to the provided communication protocol.

6.12 System noise test When the system is in normal working state, use a sound level meter to measure the system noise at 1m in the front and back, left and right, and 1/2 of the height of the equipment.

6.13 Insulation resistance Carry out the test according to the method specified in

5.3.2 of GB/T 19826-2014.

6.14 Dielectric strength Carry out the test according to the method specified in

5.3.3 of GB/T 19826-2014.

6.15 Damp and heat resistance Carry out the test according to the method specified in

5.3.6 of GB/T 19826-2014.

6.16 Degree of protection Carry out the test according to the method specified in GB/T 4208.

6.17 Measures to prevent electric shock Carry out the test according to the method specified in

5.12 of JB/T 5777.2-2002.

e) Exit-factory serial number;

f) Year and month of manufacture;

g) The name or marking of the manufacturing unit. Various switches, instruments, signal lights, light signs, power bus, control bus, intake (liquid) port, exhaust (liquid) port, communication interface, etc. of the product shall be marked with corresponding text symbols, which shall be consistent with that in the wiring diagram. The characters are required to be clear and legible; not fading, not falling off; and evenly arranged for easy observation.

7.1.2 Polarity marking If the electrical connector has a polarity, or there is a ground terminal and a ground connection wire, it shall be marked.

7.1.3 Warning signs Warning signs shall be used for hazardous areas, such as:

--- risk of electric shock;

---high temperature;

--- Flammable gases.

7.2 Packaging The system packaging shall be moisture-proof and vibration-proof. Documents accompanied the product shall include:

a) Product exit-factory certificate;