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This paper presents an alternative One-cycle Control applied to a controlled rectifier so that Discontinuous PWM (DPWM) techniques are obtained, equivalent to those obtained with Carrier Modulation or Space Vector Modulation. With the help of the Hybrid PWM, the DPWM mathematical description is greatly simplified giving to that technique a graphical interpretation and a simple mathematical formulation...
An unity-factor AC/DC converter in single-phase has a double-frequency ripple component in the input power. Usually a large output capacitor is inserted to reduce the component. However it is not desirable for efficiency and aging. It is necessary to develop an alternative energy-storage circuit to absorb the ripple power. This paper proposes a control method of a ripple correction circuit which is...
Recent faster and more frequent train service at Tokaido Shinkansen makes it difficult to stabilize the feeding voltage only by compensating reactive power. Therefore, the active power compensation between two phases has been introduced for further stabilization of the voltage, and the converter control strategy called ??fixed power-factor method?? was applied in the commercial operation that started...
This paper proposes a predictive algorithm for AC-DC three phase converter with active power factor correction. The control proposed does not have current feedbacks and the input current levels are controlled by the DC voltage loop. The main idea of this algorithm is to take the three phases converter like a sequence of two converters working simultaneously and the equations modeled was approximated...
Passivity-based control (PBC) is based on a procedure including energy/power shaping and series/parallel damping injection to control several nonlinear systems such as power converters. In this paper, PBC is used to design a controller for three phase/level/switch PWM (Vienna I) rectifier. Passivity-based controller is supposed to regulate the output voltage and the input three phase sinusoidal currents...
In this paper is studied the single-phase two-cell multilevel cascade H-bridge power converter connected to the grid, acting as a synchronous rectifier. The power exchange process between the cells of the converter and the grid is analyzed. Based on this analysis and on the power converter model the stages of the controller design process are shown. A new controller for the cascade power converter...
This paper presents a wind electric conversion system composed of: permanent magnet synchronous generator, three-phase diode rectifier, DC/DC buck converter, PWM voltage inverter and transformer feeding a network. The PWM voltage inverter current controllers impose that the mains currents will have near sinusoidal waveforms with unity power factor, leading to a high quality power delivered to the...
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