Three Phase Active Harmonic Rectifier (AHR) to Improve Utility Input Current THD in Telecommunication Power Distribution System Conference Paper uri icon

abstract

  • Modern telecommunication power supply systems have several parallel connected switch mode rectifiers to provide -48V DC. Typical switch mode rectifier configuration includes a three phase diode rectifier followed by a DC-DC converter. Such a system draws significant harmonic currents for the utility resulting in poor input power factor and high total harmonic distortion (THD). In this paper, a three phase active harmonic rectifier (AHR) scheme is proposed. In AHR scheme, a diode rectifier module is replaced by 6-IGBT PWM rectifier to supply load harmonics as well as its own active power. Each DC-DC converter module is connected to a shared 48V dc-link. The AHR module together with parallel connected switch mode rectifiers is controlled to achieve dean input power characteristics. The VA ratings of AHR scheme is compared with an active power filter (APF) approach. The control design is based on the synchronous reference frame approach. Analysis, simulation and experimental results show that AHR offers several advantages such as lower VA rating, better current control response, efficient use of AHR dc-link, small size, and stable de-link voltage control.

author list (cited authors)

  • Kim, S., Todorovic, M. H., & Enjeti, P. N.

citation count

  • 5

publication date

  • January 2003

publisher