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A new 3-phase current controlled PFC rectifier has been proposed in this paper. Phase difference in between input voltage and current is minimized using an a-periodic control signal generated using input current, phase angle of input voltage, and output voltage. A 1V (P-P) 5KHz triangular wave is used here to generate PWM signal. Simple PID controllers have been added with the controller of the rectifier...
This paper proposes a novel and simple harmonics compensation strategy that can control the fundamental reactive current in the previously proposed smart charger (SC) for electric vehicles (EVs) in single-phase three-wire distribution feeders (SPTWDFs). The proposed harmonics compensation strategy uses only constant dc-capacitor voltage control (CDCVC), which is typically used in grid-connected pulse-width...
This work presents the extended capabilities of a single-phase Pulse Width Modulation (PWM) rectifier to achieve a unity power factor (PF) in the Point of Common Coupling (PCC). It can act as a dynamic var compensator, fixed var compensator and Active Power Filter (APF). To accomplish such tasks a control scheme based in two cascaded loops is used. The outer loop regulates the dc bus voltage and provides...
This work proposes the modelling and simulation of a single-phase AC/DC half-bridge T-type converter by using a Sliding Mode Control algorithm, which is little sensitive to disturbances and displays fast dynamic behavior. The control ensures unity power factor, sinusoidal input currents, regulated DC output voltage, and a three level converter grid voltage. This paper also compares the proposed solution...
A new harmonics profile injection based active islanding detection technique is proposed for Photovoltaic (PV) based voltage source inverter (VSI) system. Positive sequence active (Ps) and reactive power (Qs) at PCC is obtaining the multivariable control structure dynamics of the VSI, where a local perturbation of % harmonic amplification factor (%HAF) is simultaneously implemented with proper threshold...
Recent development in the power electronic converters, especially those intended for the use in renewable energy applications, emphasize the importance of resolving power quality issues of the grid connected converters. With the increase in number, distributed energy resources will predominantly determine the harmonic content, as the most common power quality indicator, of the grid current and voltages...
This paper presents H-bridge converter which is bridgeless boost converter with sinusoidal pulse width modulation to improve the quality of utility mains ac supply. Due to nonlinear loads and common mode voltage harmonics are produced on the supply side which can be reduced using sinusoidal pulse width modulation technique for H-bridge converter. To reduce the common mode noise currents the grounds...
This paper presents a shunt active power filter (SAPF) topology, based on the concept of a transformer with open-end winding (OEW), for reactive power and harmonic compensations employed in three-phase four wire (3P4W) systems under balanced and unbalanced conditions. The proposed system uses two independent dc-links and two independent converters series connected through transformers. Complete system...
This paper presents two universal active power filter (UAPF) configurations for reactive power and harmonic compensation without series isolation transformer. The proposed systems combine both series and shunt compensation, by using converters with one (configuration I) or two (configuration II) dc-links. They are suitable for applications in which size, weight and cost associated with transformers...
This paper presents the principle and implementation of the wavelet PWM (WPWM) technique based on dyadic-type multi-resolution analyses (MRAs) for single-phase inverters, analyzes and gives the inverter's output features at different parameters based on WPWM technique, which is beneficial to choose suitable parameters. Finally, according to the harmonic eliminating principle, compares WPWM with SPWM...
Aiming at solving the problem of harmonic suppression and reactive power compensation, the traditional method is to use reactive power compensation and active power filter. This paper has promoted a new type of Pulse Width Modulation (PWM) rectifier that has the function of harmonic suppression and reactive power compensation which also describes the control method in detail. The paper attempts to...
a novel control strategy is proposed to suppress the 2nd voltage harmonic in the DC side of a PWM rectifier when the grid supply is unbalanced. The control strategy described in the paper solves the problem of low-order harmonics generated by a PWM rectifier. The control system is divided into two symmetrical double closed-loop systems to control positive and negative-sequence current respectively...
This paper attempts to design a fuzzy controller, with a view to enhance the overall power quality of an ac-ac converter and regulate the load voltage. Besides it envisages investigating the performance of three firing strategies for the power switches in an AC-AC Converter. The algorithm is articulated in order that the input current vector is allowed to closely follow the source voltage wave such...
Voltage source converter based DSTATCOM has been accepted as the most preferred solution for reactive power management in distribution power networks which plays a vital role in improving power quality, correcting power factor and maintaining constant distribution voltages. However, the quality of DSTATCOM output voltage and current itself, such as injected harmonics and Total Harmonic Distortion...
Different control strategies for shunt active power filter (APF) are reported in literature several of them have satisfactory response under normal operating conditions, but there is still some confusion regarding the preferable controller for the shunt APF under normal and fault conditions. This paper evaluates the performance of shunt active filter for two different control strategies namely Hysteresis...
This paper attempts to analyze the inherent harmonics present in Sine-PWM inverter output with battery as well as rectified AC as sources. A novel technique for reducing harmonics in PWM inverter output by modifying the reference waveform is proposed, which is validated by MATLAB simulations.
Traditional control method of PWM(Pulse Width Modulation) rectifier has good dynamic and steady-state performance, But when PWM Rectifier worked under unbalanced voltages, various harmony powers occurred. Quality of output voltage and input current had been affected. Analyze unbalanced voltage and current through the method of symmetrical component, and two vector-oriented control strategy based on...
The paper discusses the working principle and architecture of UPQC. It described two control schemes for UPQC, for enhancing power quality of sensitive non-linear loads. Based on the different characteristics of series part and shunt part, two control schemes have been designed. Extensive results of digital computer simulation studies are presented to validate the proposed control strategies. The...
This paper is dealing with single phase PWM rectifier parameter optimization. A control loop has been designed to attain a suitable output DC voltage with minimum ripple, input current with minimum harmonic and maximum input power factor. In this paper these parameters have been optimized by using Genetic algorithm. To verify the effectiveness of proposed optimization, different simulations have been...
Active Front End converters (AFE) connect a DC link to a grid, usually with three phases. They allow energy flow in both directions, reduce grid-current harmonics, needed short-circuit power and non-active power in comparison to diode or thyristor-based devices. One more advantage, with is in the center of this paper, is the dynamic reaction to load variations combined with the need for robust control...
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