This paper describes the theory and some practical results of a voltage and current line conditioner based on high frequency active IGBT filters. This conditioner has been developed for a power range of 50 kVA to 1000 kVA under a P.I.E. project led by the utility company IBERDROLA in colaboration with SAFT-NIFE Ibérica and ASINEL.
The power topology consists on a parallel current active filter aimed to cancel current harmonics and reactive current from non ideal loads which in time feeds a series voltage active filter which reduces the line voltage distortion, steps, flicker and slow voltage changes. In the case of a short interruption, the current filter will act as a voltage inverter, feeding a practical part of the load during 500 ms. The power circuit has also the possibility of working as a universal conditioner.
The control circuit is based on two independent DSP's. This fact allows the current filter to work as a separate equipment. A very great effort is being done on optimizing the control algorithms in order to reduce response time and the noise immunity. The converters control actuates on both the duty cycle and the polarity of the modulation. First practical results have been presented at PQA '94.
| Filename: | Unnamed file |
| Filesize: | 899.9 KB |
