Improved grid voltage sensorless control strategy for railway power conditioners. Issue 12 (1st December 2015)

• Record Type: Journal Article
• Authors: Bozorgi, Amir Masoud; Sanatkar Chayjani, Majid; Mohammad Nejad, Reza; Monfared, Mohammad
• Is Part Of: IET power electronics. Volume 8:Issue 12(2015)
• Page Start: 2454
• Page End: 2461
• Publication Date: 2015-12-01
• Subjects: railway electrification -- voltage control -- electric current control -- power grids -- power supply quality -- power filters -- low‐pass filters; improved grid voltage sensorless control strategy -- railway power conditioners -- high‐speed trains -- power grid -- power quality compensation -- moving average filter -- compensating current detection -- proportional‐resonant controller -- compensating current control -- sensorless virtual flux method -- second order low‐pass filters -- dynamic RPC characteristic -- steady‐state RPC characteristic; Power electronics -- Periodicals; 621.31705
• DOI: 10.1049/iet-pel.2014.0673
• Languages: English
• ISSNs: 1755-4535

Abstract

Abstract : Rapid development of high‐speed trains confronts the power grid with serious power quality problems. In this study, to compensate power quality, an improved grid voltage sensorless control method for the railway power conditioner (RPC) is proposed. The proposed control strategy utilises a moving average filter to better detect the compensating currents and a proportional‐resonant controller to control the compensating currents. Moreover, a sensorless virtual flux method based on second order low‐pass filters is presented to replace the AC voltage sensors. Using the proposed strategy, the dynamic and steady‐state characteristic of the RPC is significantly enhanced. Through simulation tests, the effectiveness of the proposed methods is confirmed.