Topic
Three-phase
About: Three-phase is a research topic. Over the lifetime, 16801 publications have been published within this topic receiving 159477 citations.
Papers published on a yearly basis
Papers
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03 Mar 1996
TL;DR: In this article, a novel PWM scheme was developed to reduce switch conduction loss, switching loss, and input current ripple, allowing accurate prediction of switch loss, EMI emissions, and inductor loss.
Abstract: Analysis and design of high switching frequency, high efficiency, three-phase boost rectifiers are presented. A novel PWM scheme is developed to reduce switch conduction loss, switching loss, and input current ripple. An average method is proposed to calculate switch currents and input current ripple, allowing accurate prediction of switch loss, EMI emissions, and inductor loss. Soft switching, control and system interaction issues are also discussed. A 9 kW, 50 kHz ZVT boost rectifier is designed with high efficiency and light weight.
46 citations
01 Oct 2007
TL;DR: In this article, a technique for zeroing the phase cluster average power under unbalanced line conditions when the control strategy is to rebalance unbalanced voltages was presented, where the average power into the individual phase legs of the converter, in general, is not zero, although the total three phase power is zero.
Abstract: This paper considers specific issues related to using the cascade (also known as the H-bridge) multilevel STATCOM with unbalanced voltages and currents at the STATCOM-AC line connection terminals. Under this condition the average power into the individual phase legs of the converter, in general, is not zero, although the total three phase power is zero. The resultant phase cluster power unbalance can result in increasing or decreasing capacitor voltages within a phase leg. This paper will present a technique for zeroing the phase cluster average power under unbalanced line conditions when the control strategy is to rebalance unbalanced voltages.
46 citations
TL;DR: In this paper, a pseudo-derivative feedback (PDF) controller is applied to the current control of three-phase grid-connected inverters with LCL filters, which significantly improves the transient response of the system to a step change in the reference input through the elimination of overshoot and oscillation.
Abstract: Pseudo-derivative-feedback (PDF) control is, for the first time, applied to the current control of three-phase grid-connected inverters with LCL filters, which significantly improves the transient response of the system to a step change in the reference input through the elimination of overshoot and oscillation. Two PDF controllers with different terms in the inner feedback path are developed for an inverter current feedback system and a grid current feedback system, respectively. For the inverter current feedback system, a simple PDF controller with a proportional term is used. The influence of the controller parameters on the transient performance is discussed in detail. Compared with a PI controller, the PDF controller is able to eliminate the transient overshoot and oscillation easily, while maintaining a fast response. For the gird current feedback system, a PDF controller with a proportional term and a second-order derivative is developed. The implementation and design of the PDF controller are presented. Active damping is achieved with only the feedback from the grid current, and at the same time, the system transient response is improved. Both theoretical analysis and experimental results verify the advantages of the PDF control over PI control methods.
46 citations
TL;DR: This research work attempts to withstand and secure the effect of voltage fluctuation of grid connected hybrid PV-wind power system using Power System Computer Aided Design or Electro Magnetic Transient Design and Control software.
Abstract: Renewable energy sources; which are abundant in nature and climate friendly are the only preferable choice of the world to provide green energy. The limitation of most renewable energy sources specifically wind and solar PV is its intermittent nature which are depend on wind speed and solar irradiance respectively and this leads to power fluctuations. To compensate and protect sensitive loads from being affected by the power distribution side fluctuations and faults, dynamic voltage restorer (DVR) is commonly used. This research work attempts to withstand and secure the effect of voltage fluctuation of grid connected hybrid PV-wind power system. To do so battery and super magnetic energy storage (SMES) based DVR is used as a compensating device in case of voltage sag condition. The compensation method used is a pre-sag compensation which locks the instantaneous real time three phase voltage magnitude and angle in normal condition at the point of common coupling (PCC) and stores independently so that during a disturbance it used for compensation. Symmetrical and asymmetrical voltage sags scenario are considered and compensation is carried out using Power System Computer Aided Design or Electro Magnetic Transient Design and Control (PSCAD/EMTDC) software.
46 citations