Harmonics supprenssion PWM converter | Energy saving | TOSHIBA INVERTER


	Harmonics supprenssion and power factor/comprehensive efficiency improving
	Energy saving by SC7 SC7 series is harmonics suppression converter to conect inverter drive equipment. SC7 control input voltage and input current to same phase (power factor=1) for harmonics suppression. Therefore, to use this SC7 will be energy saving by harmonics suppression and power factor/comprehensive efficiency.

Outline of comprehensive efficiency improving

Power supply equipment efficiency	Improving by power factor=1 control.
Capacity of breaker Cable size	Reducing capacity of wiring apparatus by decreasing motor current and input current.
Inverter efficiency	Improving by inverter's inside loss; Rectifier loss is nothing.
Motor driving voltage	Keep the motor driving voltage to high level without voltgae drop as rector.
Motor efficiency	Improving by decreasing motor current for high motor driving voltage.

- Comparison of needed input capacity:
Inverter only:
  Input Capacity = (1.732*Vout*Iout)/(eff1 * cosX)
Connected SC7:
  Input Capacity = (1.732*Vout*Iout)/eff2

Vout: Inverter's output voltage
Iout: Inverter's output current
eff1: Inverter's efficiency
eff2: Inverter and SC7 efficiency
cosX: Inverter's input power factor

Inverter's input power factor:
  Reactor installing: about 0.8
  nothing: 0.4~0.6

Note:
Interter's input power factor depends on capacity of power supply and impedance of wiring.

- In case of driving 160kW motor (440V-250A)

Condition	Inverter/Converter efficiency	Total power factor	Necessary input Capacity
Inverter with DC choke	0.96	0.8	248.1 kVA
Inverter with SC7	0.98 x 0.98 = 0.96	1	198.5 kVA

Condition	Input current	Cable size	MCCB flame	Selected transformer capacity
Inverter with DC choke	253 A	100 mm²	400 AF	300 kVA
Inverter with SC7	194 A	60 mm²	300 AF	200 kVA