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A LC filter can be added to the input of the conventional buck converter to make the converter operate in discontinuous capacitor voltage mode. In this mode, the converter obtains the inherent power factor correction. Besides, both the input and output current will be continuous. This makes it possible for the converter operating at a high power level range. The input current will follow the input...
This paper presents a vector current controller scheme, which operates according to grid virtual flux orientation for the three phase, 3-wire pulse-width modulated voltage source converter (VSC). The usage of voltage sensors to determine the grid voltage angle for synchronization and the grid voltage magnitude for the controller operation are avoided by applying a virtual flux concept in the proposed...
This paper investigates a new approach to develop and implement a virtual flux oriented control (VFOC) for the front-end three phase bidirectional voltage source converter (VSC) by adapting the principle operations of voltage oriented control (VOC) and power estimation used in virtual flux direct power control (VFDPC). The proposed VFOC operates with minimal number of sensors by avoiding the used...
This paper is focused on the analysis and design of a switching control strategy to correct power factor, to regulate output voltage of a single-phase active three-level rectifier (SPATR) and to guarantee low harmonic distortion using a type of hysteresis current-mode control. The switching criterion is designed analyzing the stability of the switched linear system, to avoid information loss from...
A two-phase driving approach for light-emitting-diode (LED) applications is proposed in this paper. In the approach, two rectangular AC sources are employed so that the output current ripple can be significantly reduced. It leads to the elimination of electrolytic capacitor from the driver circuit. The approach is realised by a dual asymmetrical half-bridge converter with LEDs as the load. Considering...
Power-factor pre-regulators generally suffer from poor dynamic response due to the need to limit the propagation of output voltage ripple at double line frequency into the voltage control loop and to achieve a satisfactory power factor performance. Ripple cancellation methods have been proposed to eliminate the double-line-frequency signal from the sampled output voltage before it propagates into...
The authors have proposed a reactive power control method by use of boost critical conduction mode (CRM) power factor correction (PFC) converters to suppress voltage rise in distribution networks. Using this method, PFC converters can control not only inductive reactive power but also capacitive reactive power. Therefore, this method is useful to control voltage. In this paper, a PFC converter and...
A modular interleaving power cell system for input voltage range of 19–265 V DC or AC consists of 15 or 6 Watts cells, operates at fixed frequency. A boost stage providing PFC, and an isolating regenerative snubber fly-back stage delivering 30 V DC at the output is combined.
Due to the high energy consumption in data and telco centers, the use of 380V or 400V DC facility-level distribution has been proposed as an alternative to the conventional AC distribution for a more efficient power delivery structure. The DC voltage is powered from the three-phase mains by a PFC rectifier and in many cases a mains transformer is used to provide galvanic isolation. In order to achieve...
This paper proposes a buck type PFC which is based on a new bridgeless inverted buck-boost circuit. The circuit can achieve ZVS for the full range via triangular current mode (TCM) and unlike conventional buck PFC, the circuit can operate for the entire cycle. The bridgeless topology has fewer numbers of components in the conduction path than any other bridgeless boost PFC circuits. The ideal full...
Nowadays, low Power Factor (PF) is a serious problem that gained more importance in power electronics area. In this paper, single phase PFC using Buck-Boost circuit topology under linearization voltage control is realized. Here the nonlinear load considered is the diode bridge rectifier, and a Buck-Boost converter is connected to its back end for PFC. The switching of buck-boost converter is done...
The problem of controlling half bridge single phase unity power factor rectifier circuit is considered. The control objectives are to achieve i) output regulation and ii) near unity power factor in the presence of an uncertain load. The considered problem is dealt with using a double-loop controller developed on the basis of the system nonlinear model. The inner-loop is designed using Lyapunov technique...
This paper presents an AC-DC converter design for applications where mains frequency is widely varied and low input current harmonics and output voltage regulation are required, for example, in aircraft power systems. The proposed design employs a Single Ended Primary Inductance Converter (SEPIC) at the DC-end of a single-phase bridge diode rectifier. In discontinuous conduction mode (DCM), the SEPIC...
In this paper, a distributed control method for distribution system with integration of distributed generations is proposed based on multi-agent system technology. Considering the requirement of voltage control and power factor correction, the distribution system voltage/var control model is built under the multi-agent system framework. To realize distributed control, the voltage adjustment message...
This paper presents distribution static compensator (DSTATCOM) using a Takagi-Sugeno (TS) fuzzy logic controller (FLC) for harmonic elimination, power factor correction, load balancing and voltage regulation. The TS fuzzy logic controller is based on linguistic variables which eliminates the need of a mathematical model of the DSTATCOM. A three phase insulated gate bipolar transistors (IGBTs) based...
Different converters like AC-DC, DC-DC or DC-AC is an inevitable part of the modern electronic equipments. Among them the active three-phase converters give a steady DC output voltage and also makes the input current shape sinusoidal. It also improves the power factor by maintaining the input voltage and current in phase. The major concentration of the paper is to develop an interface technique between...
The control technique presented in this paper -Peak Current Mode Control is a simplified power factor correction (PFC) technique for single stage AC/DC converters, By using low cost standard PWM control IC's implementation becomes easy for this controller. In this paper Integrated buck-fly back converter (IBFC) is a single stage AC/DC converter, operating in discontinuous conduction mode (DCM) to...
The six-leg DSTATCOM is used for suppression of harmonics and regulation of terminal voltage. The proposed algorithm is based on IcosФ control algorithm for DSTATCOM which uses unit templates instead of phased locked loop (PLL) to generate cosθ and sinθ to reduce the execution time. The six-leg IGBT based VSC when compared with three-leg IGBT uses unipolar switching, which will double the PWM switching...
This paper provides power factor correction, harmonics elimination, load balancing and neutral current compensation of linear and non-linear, balanced and unbalanced loads using custom power device DSTATCOM for three-phase four-wire (3P4W) system. Perfect Harmonic cancellation (PHC) theory has been used for reference current generation. A three-leg voltage source converter topology with T-connected...
This paper presents a study and the design with the technical aspects of implementing electronic ballast used for lighting and keeping the power of a lamp while restricting and controlling the input current during its activity. The electronic ballast circuit proposed is based on two power converters, like a boost converter with power factor correction (PFC) and an a half bridge converter with resonant...
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