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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 this paper, authors propose a novel fourteen-band hysteresis technique to control the fifteen level packed U cells (PUC) converter. This topology was first introduced. It combines advantages of the flying capacitor and the cascaded H-bridge topologies. The study of the novel converter allows the establishment of the switches gates signals equations. In case of rectifier operation, the proposed...
This paper deals with the analysis, modeling, and control of a doubly-fed induction generator (DFIG) driven by the wind turbine. A control technique is presented for extracting the maximum power from the wind turbine. The wind energy conversion system (WECS) is equipped with a DFIG and two back-to-back connected voltage source converters (VSCs) in the rotor circuit. The proposed control technique...
This paper presents a new method to improve the DC voltage response on the load change of a three-phase power converter space vector PWM with current regulator. The line current reference is generated from the load current referred to as control-side and the output of PI controller driven by DC voltage error. The load current estimation can be obtained by using the Luenberger observer. A simplified...
With introduction of recent standards on limiting harmonic pollution of electrical power distribution system, three-phase PWM converters are being considered as prime candidates for interfacing high-power electronic equipment to power supply lines. In these applications, converters can provide input currents without distortion and with unity power factor. In this paper, a unified discrete event model...
Abstract-Distributed generation (DG) can be used to generate a customer's entire electricity supply; for peak shaving; for standby or emergency generation; as a green power source; or for increased reliability. In this paper, analytical approaches for optimal placement of DG with unity power factor in power systems are presented. Placement of DG in a radial feeder is analyzed and the theoretical optimal...
This paper proposes a novel topology for Electrical Vehicles and Plug-in Hybrid Electrical Vehicles with controllable power factor with 3-phase input and unity power factor with single phase input. The proposed on-board topology provides bidirectional power flow to/from the grid, low weight, low volume, and isolation. A control scheme is devised and a complete simulation of power control is performed...
In this paper, authors propose a novel six-band hysteresis technique to control the seven level packed U cells (PUC) converter which was first introduced in. This converter combines advantages of the flying capacitor and the cascaded H-bridge topologies. The study of the novel converter allows the establishment of the switches gates signals equations. In case of rectifier operation, the proposed six-band...
The control of cascaded H-bridge boost rectifiers is a challenging task, due to the inherent coupling of the H-bridge modules. This property highlights the demand for a robust control technique, appropriate for this nonlinear and non-minimum phase system. This paper introduces an approach that combines a deeper understanding of the system's power flow with the well known robustness of the sliding...
In this paper, a novel control method for the three-leg based three-phase to two-phase matrix converter is proposed. The instantaneous two input line voltages are used to synthesize the desired output voltages, which can get sinusoidal input currents with unity power factor and two-phase sinusoidal output voltages with 90° angle shift. The biggest voltage transfer ratio can reach 0.866. A double-sided...
The three-phase three-level unity PF rectifier can improve the power factor of three-phase rectifier. However, both the power factor (PF) and total harmonic distortion (THD) are degraded in low-output power region, because its “critical input inductor” is calculated for the nominal load condition. A novel reference compensation current strategy for three-phase three-level unity PF rectifier considering...
This paper proposes a new half-bridge inverter based active power quality compensator (APQC) for electrified railways with a three-leg inverter. The first-leg is connected to α-phase, and the second-leg is connected to β-phase. The midpoint of two capacitors on the dc side is connected to the ground line. These two half-bridge inverters exchange the active power on the each feeder each other through...
The mathematical and simulation model of three-phase voltage source rectifier (VSR) used in aircraft is introduced in this paper. Based on the model, the principle of the seven-segment space vector pulse-with modulation (SVPWM) control strategy is presented. The double closed-loop control method is applied in the PWM rectifier. The rectifier can realize unity power factor by adopting the fixed switching...
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...
Inductive Power Transfer (IPT) is a technique for transferring power from one system to another with no physical contacts. Until now this technique has been widely used only for unidirectional power delivery in numerous applications over a wide power range. As bi-directional and contactless power transfer is advantageous for applications such electric vehicles and moving appliances, this paper presents...
A full bridge boost power converter is considered in order to convert 3-phase AC into DC voltage with power factor correction. Desired current trajectories are generated so that, if they are followed, the output voltage will have the desired value and the converter will have a unity power factor. Traditional as well as two types of second order (super-twisting sliding and prescribed convergence law...
The objective of this paper is to model and simulate a three-phase Voltage Source Pulse Width Modulation (PWM) Rectifier Based on Direct Current Control feeding an indirect vector controlled Induction Motor Drive (VCIM) and 3-Level SVM based PMSM Drive. Based on the mathematical model of PWM rectifier, the dual close loop engineering design with decoupled feed-forward control is applied in the three...
In order to get an optimum power factor in the load compensation under distorted supply voltages, a new control strategy is proposed in this paper. In this strategy, the conductance factors for the compensated load are evaluated for the specified source current total harmonic distortion (THD) limit. The performance of this method along with perfect harmonic cancellation (PHC) and unity power factor...
This paper proposes a constant DC voltage control based strategy for an active power quality compensator (APQC) used in electrified railways. The proposed strategy consists of only an I-PD based constant DC capacitor voltage control with an added moving average type low-pass filter (LPF). The added LPF improves the response time of the constant DC capacitor voltage control for the APQC. Thus we offer...
According to the control requirement and actual project condition of three-phase high power factor rectifier, for the sake of eliminating inconstant switching frequency in the converter that brought on rather serious power supply harmonic pollution and shock damage of power devices and reducing difficulty of filter circuit design, based on these problems the constant switching frequency control algorithm...
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