GENTEST ALD – ACTIVE DISSIPATIVE LOAD BANKS (NON-REGENERATIVE)

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Intesys Active Dissipative (non-regenerative) Load Banks are based on a PWM converter and a resistor. Load regulation is done by a PWM converter and the power dissipation is done by a power resistor. The ALD is continuously variable in the power with 1% resolution, in cos-phi (0 inductive to 1, 0 capacitive to 1), in frequency (40 to 400 Hz) and in voltage (0 up to 690 V), max 3% distortion (directives IEEE 519).

The resistor load comes instead of the AFE regenerative module.

 

The load regulation is performed by a properly filtered PWM converter in order to obtain a level of distortion better than the public network, plus a ventilated DC resistive load with a lower power (80%) than the generator under test and and a system of DC-Bus early-stage pre-charge of the DC bus

 

The advantage over a passive load:

 

–     smaller dimensions (there is only a one-step, DC resistive element with ventilation)

 

–      power factor adjustable by the user from 0 to 1 inductive and from 0 capacitive to 1

 

–      variable voltage from 0 to 690 V, variable power from 0 to Pmax (1% accuracy), variable frequency from 40 to

        400 Hz (higher frequencies possible for special applications)

 

–      waveform distortion better than public network (THD <3%)

 

–      absence of reactive passive elements (inductors and capacitors)

 

–      less complex design (no contactors for load steps needed)