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LED with constant output current and power factor correction are presented in this paper, the non-isolated Buck converters are used for the LED drivers, according to different operating mode of inductor current, power factor correction is realized with both of Voltage Follower Control under DCM and Nonlinear Carrier Control under CCM. NLC needn't the multiplier which is used in traditional power factor...
In this paper, the modeling and control of a new three-level single-stage power-factor-corrected (PFC) ac/dc converter is presented. The converter integrates an AC/DC boost PFC converter and a three-level DC/DC converter. An averaged model of the new converter is derived in the paper and used to design a controller that regulates the output voltage in presence of the input voltage variation and load...
The principle of the dynamic voltage restorer (DVR) to the voltage sag problem with phase angle jump is analyzed in this paper. Based on the fundamental component of steady-state equivalent circuit, the phase diagram with voltage fluctuations and phase angle jump is shown. According to instantaneous reactive power theory and the low-pass filter theory, the initial phase of the source fundamental phase...
A bridgeless Power Factor Correction (PFC) circuit based on Cuk converter is proposed in this paper. The operation during each sub-interval modes of the converter operated in Discontinuous Conduction Mode (DCM) is discussed. The small-signal and large signal models are presented using Current Injected Equivalent Circuit Approach (CIECA). PLECS/Simulink is used to verify the capability of the proposed...
This paper introduces a new cost effective structure of a 4-switch single-phase to three-phase converter using a Quasi Z-source (QZs) network for induction motor drive applications. In comparison to the traditional 6-switch structure, the proposed circuit reduces the cost of the system, switching losses and the complexity of the control method as well as the interface circuits used to make the trigger...
In this paper a tracking problem for a single-phase PFC rectifier exploiting the Boost converter as nonlinear system using model predictive control (MPC) is discussed. After approximation of the tracking error in the receding horizon by its Taylor-series expansion to any specified order, an analytic solution to the MPC is developed and a closed-form nonlinear predictive controller is presented. The...
The fundamental theory and control methods of Active Power Factor Correction (short for APFC) are introduced in this paper. It analyzes and studies the APFC based on the three-phase rectifier. In addition, the simulation model is built on the MATLAB and the results are shown in this paper. The results show that the grids-side input current wave is changed with a sine wave, has the same phase with...
This paper proposes a new control strategy using less number of sensors for variable speed wind energy conversion system (WECS). Maximum Power Point Tracking (MPPT) algorithm, and near unity power factor correction control (UPF) are achieved at the generator side using direct driven Permanent Magnet Synchronous Generator (PMSG). The PMSG operates at variable wind speed connected to a full controlled...
As generally acknowledged, the main drawback of a fully-digitalized power-factor-correction (PFC) rectifier is that too many analog-to-digital converters (ADCs) are used, and hence the corresponding cost is high. Hence, in this paper, the information on the required signal is obtained via two paired sawtoothed waves compared with the sensed signal, without any ADC used. For the PFC rectifier operating...
The Improved Power Quality AC-DC Converters (IPQCs) provides enhanced power quality in terms of improved power factor and reduced Total Harmonic Distortion (THD) at the utility interface. This paper addresses comparison of power factor correction techniques for high frequency isolation based single phase Buck-Boost AC-DC Cuk Converter, which consists of only one switch resulting in reduced THD and...
In this paper, the problem of controlling AC/DC full bridge converter is considered. The control objectives are twofold: (i) guaranteeing a regulated voltage for the connected load, (ii) enforcing power factor correction (PFC) with input current sinusoidal. The considered problem is dealt with using a nonlinear controller that involves two loops in cascade. The inner loop is designed, using sliding...
This paper presents high performance control algorithms for a 100 kVA three-phase four-wire online voltage regulator. The 100 kVA voltage regulator is composed of a PWM rectifier, a center-tapped DC bus, and an inverter. The rectifier connects with the grid through an LCL filter, providing power factor correction and DC-link voltage regulation. The inverter output power is fed forward to the rectifier...
This paper proposes a digital average current mode control method in discontinuous conduction mode (DCM) power factor correction (PFC) rectifier. The proposed control technique can directly sense the average value of the inductor current in each switching cycle digitally by employing a conventional current sensing circuit. Thanks to the current control loop, high speed analog-to-digital converters...
Power Factor Correction (PFC) is used in power systems operating from single phase AC to correct for the non linearity of the rectifier. Use of PFC in motor drives is increasing because of increased regulation from the power utility side. However, integration of PFC and field oriented control of motor on a single controller remains challenging from a processor bandwidth point of view while keeping...
In this paper a three-level single-stage power-factor-corrected ac/dc converter is presented. The proposed circuit integrates the operation of the boost power factor correction and the three-level dc/dc converter, and mitigates the drawbacks found in previously proposed two-level single-stage voltage-fed converters. In the paper, the operation of the new converter is explained in detail, its steady-state...
The Improved Power Quality AC-DC Converters (IPQCs) provides enhanced power quality in terms of improved power factor and reduced Total Harmonic Distortion (THD) at the utility interface. This paper addresses the power factor correction techniques for high frequency isolation based single phase Buck-Boost AC-DC Cuk Converter, which consists of only one switch resulting in reduced THD and improved...
This paper presents the new control design or the unified power quality (PQ) conditioner (UPQC) for Power Quality improvement. The purpose of UPQC is to compensate for voltage sags/swells, load demand changes, power factor correction etc,. The control strategy employs a kalman filter to estimate the fundamental component as well as the harmonic components of the voltage and current. Simulation of...
The performance of the DSTATCOM depends on the control algorithm i.e. the extraction of the current components. So, for this, there are various control algorithms for the control of DSTATCOM block depending on various theories and strategies like phase shift control, instantaneous PQ theory, synchronous frame theory, Adaline based theory. Each of the algorithms specified have their own merits and...
PV solar farms produce power during the day and are completely idle in the nights. This paper presents a novel utilization of a PV solar plant as STATCOM in the night for load reactive power compensation and voltage control. This STATCOM functionality will also be available to a substantial degree during the daytime with the inverter capacity remaining after real power production. The local distribution...
This paper presents a novel topology of power electronic transformer. In the design process, the AC/DC, DC/AC, AC/AC converters and high frequency transformer have been used. One matrix converter operates as AC/AC converter in power electronic transformer. The proposed power electronic transformer performs typical functions and has advantages such as power factor correction, voltage sag and swell...
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