JB/T 14260-2022Technical Specification for Electrical Energy Router (English PDF)

3.1 Electrical Energy Router

Power electronic equipment integrated from multiple power modules, capable of extensive interconnection between high/low voltage and AC/DC systems, featuring electric energy management functions and enabling multi-directional power transmission.

3.2 Power Module

The power conversion unit - a component device - that implements the power conversion and protection functions of the electrical energy router.

3.3 Conversion Efficiency

The ratio of total output power to total input power under rated operating conditions, calculated according to Formula (1).

Where.

eta -- Conversion efficiency of the electrical energy router;

Pout -- Total output power of the electrical energy router under rated operating conditions;

Pin -- Total input power of the electrical energy router under rated operating conditions;

Pa -- Power of the electrical energy router’s auxiliary device.

4.1 Normal Operating Conditions

4.1.1 Ambient temperature

Ambient air temperature range for the electrical energy router. -5°C ~ 40°C.

4.1.2 Altitude

The installation site altitude shall not exceed 1 000 m. For altitudes above 1 000 m, derating shall be applied in accordance with GB/T 3859.2.

4.1.3 Humidity

Relative humidity range. 5% ~ 95%, non-condensing.

At a temperature of 40°C, the relative humidity of the air shall not exceed 50%. Higher relative humidity is permissible at lower temperatures; for example, it may reach 100% at 25°C. Special measures shall be taken to address condensation that may occasionally occur due to temperature fluctuations.

4.1.4 Electrical conditions

Unless otherwise specified, an electrical energy router complying with this document shall operate normally under the following power grid conditions.

a) Harmonic voltage of the AC grid shall not exceed the limits specified in GB/T 14549;

b) Three-phase voltage unbalance of the AC grid shall not exceed the limits specified in

GB/T 15543;

c) Frequency deviation of the AC grid shall not exceed the limits specified in GB/T

15945;

d) Voltage fluctuations and flicker of the AC grid shall comply with the provisions of

GB/T 12326;

e) Voltage deviation of the AC grid shall comply with the provisions of GB/T 12325;

f) Voltage deviation shall be within the range of ±10%.

4.2 Abnormal Operating Conditions

If the actual operating and usage conditions of the equipment differ from those specified in 4.1, the equipment will operate under abnormal operating conditions; the user shall identify the differences between the intended usage conditions and the standard conditions, and consult the manufacturer regarding the suitability of using the equipment under such conditions.

5.1 Safety Requirements

The safety requirements for the electrical energy router are as follows.

a) Requirements for protection against electric shock shall comply with the provisions of GB/T 5226.1.

b) Insulation levels for high-voltage AC/DC ports - lightning impulse withstand voltage shall comply with the provisions of GB/T 311.1; insulation levels for high-voltage

AC/DC ports - withstand voltage shall comply with the provisions of GB/T 311.1 and

GB/T 17467; withstand voltage to ground for low-voltage AC/DC ports shall comply with the provisions of NB/T 32004.

c) Protective earthing connections shall comply with the provisions of GB/T 5226.1.

d) Clearance and creepage distances shall comply with the provisions of DL/T 1216.

5.2 Performance Requirements

5.2.1 Conversion efficiency

The conversion efficiency of the electrical energy router under rated operating conditions shall be no less than 95%.

5.2.2 Cooling system

The electrical energy router may employ natural cooling, forced air cooling, or water cooling, and shall ensure long-term operation under specified operating conditions. The cooling system shall be equipped with fault protection functions.

5.2.3 Control functions

The electrical energy router shall possess the following control functions.

a) Power control function. Power control accuracy shall be within 3% of the target power;

b) Voltage control function. Voltage control accuracy shall be within 3% of the target voltage.

5.2.4 Lightning protection

The electrical energy router shall be equipped with lightning protection devices.

5.2.5 Fault ride-through

The ports of the electrical energy router should possess grid voltage fault ride-through capability.

5.2.6 Port overload operation capability

The electrical energy router shall be capable of long-term overload operation at 1.1 times the rated current and overload operation at 1.2 times the rated current for 10 s.

5.2.7 Power flow switching time

During operation, the electrical energy router shall be capable of performing power flow switching in response to commands from the upper-level control and dispatching device; the response time for the power flow switching commands shall not exceed 100 ms.

5.2.8 DC port performance

The DC port of the electrical energy router shall operate normally under the conditions specified in 4.1.4, with the following performance requirements.

a) The voltage control accuracy at the DC port of the electrical energy router shall be better than 3% of the nominal voltage;

b) The voltage ripple at the DC port of the electrical energy router shall not exceed 5% of the nominal voltage;

c) The current ripple at the DC port of the electrical energy router shall not exceed 5% of the nominal current.

5.2.9 AC port performance

The AC port of the electrical energy router shall operate normally under the conditions specified in 4.1.4, with the following performance requirements.

a) The voltage control accuracy at the AC port of the electrical energy router shall be better than 3% of the nominal voltage;

b) The allowable deviation of the output frequency at the AC port of the electrical energy router is 1% of the nominal frequency;

c) The output current harmonics at the AC port of the electrical energy router under rated operating conditions shall be less than 3%.

5.2.10 Dynamic performance requirements

The power step response time of the electrical energy router - whether between all ports or between any two specific ports - transitioning from no-load to full-load shall be less than 50 ms.

5.2.11 Other performance requirements

The electrical energy router shall meet the following additional performance requirements.

a) The noise level of the electrical energy router shall be less than 80 dB; for electrical energy routers with a sound pressure level exceeding 80 dB, a “Hearing Damage” warning label shall be affixed in a conspicuous location, and the instruction manual shall provide guidance on mitigating the risk of hearing damage;

b) The electrical energy router should support a multi-port parallel operation mode;

c) The electrical energy router should support clustered operation with multiple units;

d) The AC port should support reactive power compensation, and this function shall comply with the provisions of GB/T 19964.

5.3 Protection Function Requirements

The protection requirements for the electrical energy router are as follows.

a) The electrical energy router shall be equipped with port over-voltage/under-voltage protection;

b) The electrical energy router shall be equipped with short-circuit protection;

c) The electrical energy router shall be equipped with over-current protection;

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