Abstract
Phase controlled resistor banks are common for temperature controlled heating systems. However, the high THD of current deters their widespread use. This paper presents a 3-phase 3-wire SCR phase controlled resistive heating system, using two banks of resistors, with same firing angle control of each bank with maximum power dissipation in the ratio of 3:2. One resistance bank is `Delta' connected with phase switching while the other resistance bank is `Y' connected with line switching. This arrangement prevents the triplen harmonics from entering into the supply system and eliminates some major characteristic harmonics from the line current. Thus, without using any additional filters, this arrangement permits power control of the resistance banks with a low current THD over a reasonable range of control. Simplicity in construction and operational requirements of the proposed topology makes it a viable and cost effective solution. Its modeling, analysis and performance assessment are presented along with support from simulation and experimental results.
Published Version
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