Picture of athlete cycling

Open Access research with a real impact on health...

The Strathprints institutional repository is a digital archive of University of Strathclyde's Open Access research outputs. Strathprints provides access to thousands of Open Access research papers by Strathclyde researchers, including by researchers from the Physical Activity for Health Group based within the School of Psychological Sciences & Health. Research here seeks to better understand how and why physical activity improves health, gain a better understanding of the amount, intensity, and type of physical activity needed for health benefits, and evaluate the effect of interventions to promote physical activity.

Explore open research content by Physical Activity for Health...

Three-phase AC-AC hexagonal chopper system with heterodyne modulation for power flow control enhancement

Li, Peng and Wang, Yachao and Adam, Grain Philip and Holliday, Derrick and Williams, Barry W. (2015) Three-phase AC-AC hexagonal chopper system with heterodyne modulation for power flow control enhancement. IEEE Transactions on Power Electronics, 30 (10). pp. 5508-5521. ISSN 0885-8993

[img]
Preview
Text (Li-etal-IEEE-TPE-2014-Three-phase-ac-ac-hexagonal-chopper-system)
Li_etal_IEEE_TPE_2014_Three_phase_ac_ac_hexagonal_chopper_system.pdf - Accepted Author Manuscript
License: Creative Commons Attribution-NonCommercial 4.0 logo

Download (2MB) | Preview

Abstract

This paper proposes a three-phase AC chopper system for the interconnection of various distributed generation (DG) farms or main utilities to enhance the active and reactive power flow control. The absence of large energy storage component in direct AC-AC converter makes the system footprint small and reliable. As the interface for different AC sources, the presented converter can be configured as star or delta. However, delta connection is preferred as it can trap the potential zero-sequence current and reduce the current rating of the switching devices. In this way, the proposed converter resembles the hexagonal chopper, and it offers an inherent degree of freedom for output voltage phase-shifting. Considering the scalability in high voltage applications, a new version of the hexagonal chopper with half-bridge cell modular multilevel structure is developed. The modular multilevel AC hexagonal chopper (M2AHC) is operated in quasi-2-level mode to suppress the electro-magnetic interference (EMI) caused by high voltage switching. Quasi-2-level operation divides the voltage level transition into multi-steps, diminishing the voltage rising and falling rates (dv/dt) in high voltage condition. Then, heterodyne modulation is adopted for the presented chopper system, supplying a new degree of freedom to decouple the phase and amplitude regulation. Based on this idea, system control strategy is developed in synchronous reference frame (SRF). Simulations and experimentations have confirmed the validity of the proposed approaches.