A Single-phase Delta-conversion UPS With Reduced Components
3rd Power Electronics and Drive Systems Technology Conf
A recently introduced reduced switch count converter family uses three switches in the legs of its single-phase,... more
A recently introduced reduced switch count converter family uses three switches in the legs of its single-phase, threephase and four-leg converters. So far, the benefits and drawbacks of such converters have been widely investigated in the literature in several applications. This paper studies and proposes the single-phase six-switch converter to be implemented in deltaconversion uninterruptible power supply system. In this
application the intrinsic limitations of the three-switch leg structure such as diminished dc bus voltage utilization is overcome and the attractive features of the conventional system are retained yet less number of power switches are employed. The proposed UPS enjoys integrated structure, effective performance and optimized utilization of device ratings at both series and parallel sides. The proposed configuration is presented and its control scheme and new hysteresis modulation are elaborated. The system operation is verified through simulation.
Cost-effective Solution for Microgrid Power Quality Assurance Using Dual-output Four-leg Converter
in 3rd Power Electronics and Drive Systems Technology Conf
In this paper, an optimum interface configuration is proposed which can be used for connecting a microsource to a weak... more In this paper, an optimum interface configuration is proposed which can be used for connecting a microsource to a weak utility. The proposed configuration simultaneously conditions the quality of the power delivered to the supplied loads in the microgrid. This system employs a recently introduced reduced switch count dual-output inverter in a mode of operation named Equal Frequency which offers the best operation features such as maximum dc bus voltage utilization and minimum device ratings. Compared to the counterpart system, the proposed configuration enjoys an integrated structure and less number of semiconductor switches while possessing the same principal characteristics such as ability to compensate unbalanced and distorted utility or the ability to supply three-phase unbalanced loads with balanced and ceaseless voltage. The proposed system is developed, its carrier based modulation scheme is elaborated and a simple control strategy is devised for it. The validity of operation of the proposed system is verified through simulation.
A Minimized Switch Count Single-phase AC/AC Converter with Active Front End
in 27th Annual IEEE Applied Power Electronics Conference and Exposition (APEC)
A three-switch single-phase converter is introduced in this paper which is a counterpart to back-to-back half-bridge... more A three-switch single-phase converter is introduced in this paper which is a counterpart to back-to-back half-bridge converters. Introducing the new converter and elaborating its modulation scheme, a single-phase ac/ac converter is proposed based on it. The proposed topology enjoys the benefits of an ideal single-phase ac/ac converter such as low THD input current, unity power factor, fast dynamic response and the ability to compensate input voltage sag/surge when supplying linear or nonlinear loads. The operation of the proposed system is validated through simulation.
Signal Processing Tools For Voltage Dip Analysis
Co-authored with Trevor Gaunt, Fred Nicolls
This paper investigates the characterization of voltage dips with aim of selecting suitable feature extraction tools... more This paper investigates the characterization of voltage dips with aim of selecting suitable feature extraction tools for the analysis of events. The symmetrical component method, ABC classification and the voltage dip segmentation method are discussed and a list of characteristics identified. Signal processing tools are reviewed and the Kalman filter and Ziarani algorithm selected as suitable feature extraction tools based on the analysis requirements of the dip segmentation method.
Download (.pdf) Application of Dual-output Four-leg Converter for Unified Power Quality Conditioner
19th Iranian Conference on Electrical Engineering, May 2011
This paper proposes a novel UPQC system based on dual-output four-leg converter. The proposed system completely... more This paper proposes a novel UPQC system based on dual-output four-leg converter. The proposed system completely fulfils the main functions of the conventional UPQC system. It is also capable of compensating any unbalance characteristics at load side (parallel side) or grid side (series side) such that the drawn currents from the grid and the voltage of the load are balanced and sinusoidal, regardless of the load or utility voltage characteristics. Another advantage of the proposed system is that despite the conventional type in which series convertor is underutilized due to its low modulation index, the proposed system is fully utilized at both series and parallel sides. Moreover, the number of semiconductor devices is reduced compared to counterpart topologies. The validity of operation of the proposed UPQC is verified via simulation.
Unscented Kalman Filter for Frequency and Amplitude Estimation
Happy Novanda, Pawel Regulski, Francisco M. González-Longatt, and Vladimir Terzija
This paper introduces a new digital signal processing algorithm for frequency and amplitude estimation based on... more This paper introduces a new digital signal processing algorithm for frequency and amplitude estimation based on Unscented Kalman Filter (UKF). The results of computer simulated and realistic synthetic data tests are presented. The initial parameters used during the tests were chosen carefully using an established parameter estimation method, the Self Tuning Least Square (STLS). It is concluded that the proposed algorithm is simple, efficient and has low computational demands compare to STLS which makes the UKF a very promising method in next generation of power quality monitoring devices.
