Mobile QR Code QR CODE : The Korean Institute of Power Electronics
Title DC-Link Voltage Unbalance Compensation of Reactive Power Compensator using Multi-level Inverter
Authors Hyo-Jin Kim ; Seung-Ki Jung
DOI 10.6113/TKPE/2013.18.5.422
Page pp.422-428
ISSN 1229-2214
Keywords multi-level inverter; STATCOM; reactive power; dc-link voltage unbalance; phase shifted PWM
Abstract Recently, we use a static synchronous compensator(STATCOM) with cascaded H-bride topologies, because it is easy to increase capacity and to reduce total harmonic distortion(THD). When we use equipment for reactive power compensation, dc-link voltage unbalances occur from several reasons although loads are balanced. In the past, switching pattern change of single phase inverter and reference voltage magnitude change of inverter equipped with power sensor have been used for dc-link voltage balance. But previous methods are more complicated and expensive because of additional component costs. Therefore, this paper explains reasons of dc-link voltage unbalance and proposes solution. This solution is complex method that is composed of reference voltage magnitude change of inverter without additional hardware and shifted phase angle of inverter reference voltages change. It proves possibility through 1000[KVA] system simulation