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In an effort to utilize the solar energy effectively through power electronics converters (conditioners), a great deal of research is being carried out to meet the increasing demand for load. This paper proposes an experimental photovoltaic (PV) power conditioning system with line connection. The conditioner consists of a flying capacitors multi-cell inverter fed by a dc-dc boost converter. The boost...
In consequence of the generic irregularity of wave energy, it is difficult to envisage the performance of a grid connected wave energy converter without simulations. This paper details a study on directly driven, linear, permanent magnet generator based, wave energy extraction scheme provided with grid-connected three phase neutral point-clamped three level inverter. The linear permanent magnet generator...
In this paper a direct predictive current control is proposed for a three-phase flying capacitor multilevel inverter. This control method has been applied to increase the bandwidth of the inverter, defined as the ratio between the switching frequency and the current injected frequency. The current control is applied without modulation, using pre-calculated sequence tables with pre-defined profiles...
Multilevel converters can reach medium-voltage operation, increasing the efficiency in high power applications. Among the existing multilevel converter topologies, modular multilevel converter provides the advantages of high modularity, availability and high power quality. Moreover, the main advantage compared to cascaded multilevel converters is the absence of input transformer; reducing the size,...
This paper investigates a predictive control strategy for a single-phase PFC rectifier exploiting the Sheppard-Taylor converter. By using this converter, the detuning problem occurring in conventional PFC rectifiers, especially at low input voltages, is avoided. This paper addresses a predictive method for designing the current controller of the Sheppard-Taylor PFC converter. The control law is derived...
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...
This paper proposes a nonlinear PID control strategy of three-phase voltage source pulse width modulation (PWM) rectifier based on predictive current control. The nonlinear controller is consisted of tracking differentiators (TD) and nonlinear combination of error. It improves DC voltage response velocity, restrains overshoot and enhances robustness against load change. In addition, the sinusoidal...
To draw a sinusoidal line current and to achieve high power factor and low voltage stress of power switches, Some single-phase three-level switching mode unidirectional rectifiers with power diodes have been presented. But there is an inherited disadvantage of imbalance of the DC-link voltage, which is difficult to be solved only by control method. A novel three-level rectifier with asymmetrical legs...
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