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Beijing and Shanghai Chinese Translation Service in The field of Inverter


6.4.3. VVVV逆变器的基本要求  Basic requirements of VVVV inverter
6.4.3.1. VVVF逆变器的基本工况： Basic working conditions of VVVF inverter:
? 牵引工况  Traction working condition
? 再生制动工况  Conditions of regenerative brake
? 反相制动工况  Conditions of plug braking
6.4.3.2. VVVF逆变器控制方式：采用PWM控制。 Control mode of VVVF inverter: by PWM.
6.4.3.3. VVVF逆变器频率控制模式  Frequency control mode of VVVF inverter

华译网北京翻译公司翻译过大量有关逆变器的文件资料。
Beijing Mandarin Chinese Translation Service Company has translated many technical documents in the field of inverter.

6.4.3.3.1. 频率控制模式应保证在脉冲转换过程中，列车运行应平稳，不应有冲击和振动，特别是转为方波调制运行时。
The frequency control mode shall make sure the train is running stably and avoid impact or vibration during impulse conversion especially when running with square wave after conversion.
6.4.3.3.2. 卖方应提供逆变器的频率控制模式，即fc=F(f1)。
The seller shall provide frequency control mode of inverter, i.e. fc=F(f1).
其中fc为斩波脉冲频率，f1为输出主频率。
Here, fc is the pulse frequency of chopped wave and f1 is the output dominant frequency.
6.4.3.3.3. 卖方应提供起动牵引电机瞬间（V=0km/h）,逆变器输出主频率的最小值fmin。
The seller shall provide the minimum value of output dominant frequency fmin in moment of starting traction motor(V=0km/h).
6.4.4. VVVF逆变器的冷却系统  Cooling system of VVVF inverter
6.4.4.1. 冷却系统必须保证VVVF逆变器能稳定工作。
The cooling system shall make sure the stable working of VVVF inverter.
6.4.4.2. 冷却系统必须考虑VVVF逆变器易于维修和维护。
The cooling system shall be designed considering the maintenability of VVVF inverter.
6.4.4.3. 如冷却系统采用强迫风冷方式，则冷却风机使用380VAC三相交流风机。
If the cooling system takes the way of forced air cooling, the cooling fan shall be 380VAC and 3 phase.
6.4.4.4. 必须提供以下参数和说明：Following parameters and descriptions shall be provided:
IGBT元件温度定额、散热器热效率、风道设计、风速、IGBT逆变器仿真计算。
Rated temperature of IGBT element, thermal efficiency of radiator, duct design, air speed, emulate calculation of IGBT inverter.

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