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When the load generated harmonic, unbalanced, and reactive power is beyond the limited capacity of a thyristor-controlled LC-coupling hybrid active power filter (TCLC-HAPF), the TCLC-HAPF with the conventional control methods cannot provide satisfactory compensation performance. In this paper, a selective compensation control method of harmonic distortion, unbalanced and reactive power of the TCLC-HAPF...
A novel and computationally efficient method for d-q control of solar photovoltaic (SPV) integrated UPQC (PV-UPQC) is presented in this paper. A digital filter is used to extract fundamental positive sequence (FPS) component of distorted grid voltage which is used to generate the sine and cosine values necessary in d-q based control. The shunt compensator of PV-UPQC compensates for the load side power...
This paper presents four single-phase universal active power filters (UAPF) topologies with 4, 5, 6 and 7 legs. The proposed systems are based on AC/AC converters with two transformers. They are suitable to improve the harmonic distortion in the grid currents and a voltage compensation. The filter uses a combination of two series filters and one shunt filter sharing a single DC-link. The proposed...
This paper presents a 3-phase unified power quality conditioner (UPQC) to compensate voltage fluctuation and current distortion in the power utility side. The UPQC compensates for any unbalanced or distorted three-phase supply voltages and load currents in a power distribution network. In this paper, UPQC and its control strategies are described. Hysteresis current controller is used for obtaining...
Power quality has become a crucial factor today due to wide application of power electronics based equipment. Conventional equipment for enhancement of power quality is becoming inadequate. Unified power quality conditioner (UPQC) is one modern device which deals with voltage and current imperfections simultaneously. In this paper, an attempt has been made to model the UPQC for voltage and current...
Voltage flicker, which is a repetitive voltage magnitude change of low frequency, is one of the power quality problems. The problem is aggravated with the use of non-linear load. The paper presents the use of a Unified Power Quality Conditioner (UPQC) as a solution to voltage flicker. A simple control technique is proposed to control UPQC. Simulation results show voltage fluctuations at the Point...
A novel scheme for obtaining the fundamental-frequency positive-sequence signals based on a combination of delayed signal cancellation (DSC) method and low-pass notch filter phased-lock loop (LPN-PLL) is proposed in this paper. DSC working in the stationary reference frame is used to obtain the fundamental-frequency positive-sequence voltage vector, while LPN-PLL is used to obtain pulsation and phase...
In this study a method is proposed in order to improve the voltage compensation performance of Dynamic Voltage Restorer by using Self Tuning Filter. The proposed control method gives an adequate voltage compensating even for 50% voltage sag and distorted voltage conditions. The proposed DVR control method is modelled using MATLAB/Simulink and tested both in off-line and real-time environment. Results...
Adaptive linear neuron (ADALINE) is a powerful estimation technique that has been used in power system applications, such as fault detection and classification, and shunt active power filter (APF). In this paper, an ADALINE based approach for control of three-phase three-wire unified power quality conditioner (UPQC) is presented. Two ADALINEs are used in the UPQC control strategy, one for load current...
This paper deals with Minimum VA rating handled by a Unified Power Quality Conditioner, which consists of Series and Shunt Active Power Filter. The Series Active Filter is Dynamic Voltage Restorer (DVR), which regulates the voltage at the point of common coupling with minimum VA loading. The Shunt Active Filter is Distribution Static Compensator (DSTATCOM) which compensates the reactive power and...
This paper presents the simulation of the unified power quality conditioner (UPQC) to mitigate voltage harmonics, voltage sag, voltage swell & current harmonics. The UPQC consists of series and shunt active power filter (APF), which are connected in cascade via a common dc-link capacitor. This paper presents the simulation is done for a three-phase UPQC working with unit vector template generation...
This paper describes a novel sliding mode method with the fuzzy controller approach in the development of unified power quality conditioner (UPQC) for reactive power, harmonics and both symmetric and asymmetric sag and swell compensation. The UPQC consists of both shunt and series converter having a common dc link. The shunt converter eliminates current harmonics generated from the nonlinear load...
The various power quality issues are of great concern now a days. The quality of power provided to the consumers can be improved by using custom power devices, (CPD). CPD uses power electronic controllers in distribution systems in order to provide reliable and good quality of power needed to power consumers. This paper gives that the use of Dynamic voltage restorer and hybrid active filters improves...
The use of the new unbalance definition introduced by some of the authors in a previous paper is considered for the compensation of Light Flicker in networks where there is the presence of large arc furnaces. Some recalls on compensation strategies for arc furnaces are firstly given. Then, the new unbalance definition is briefly recalled in its original formulation in frequency domain and extended...
Power quality problems have received increasing attentions in recent years due to proliferation of nonlinear and sensitive loads as well as unpredictable and unavoidable system faults. Power quality problems mainly include current and voltage harmonics, reactive power, supply unbalance, sag, swell etc. Series Hybrid Active Power Filters (SHAPF) have been the main topic of interest for researchers...
This paper presents a new control structure for the series active filters. In this controlling structure, resonant controllers are used in order to eliminate harmonics and voltage flicker. The presented control circuit has the property of selective harmonics elimination and voltage flicker. Via this feature it is possible to separate selected harmonics in the point of common coupling voltage and then...
This paper presents a three-phase cascaded H-Bridge MLI as Shunt Active Filter intended for installation on industrial and utility of power distribution system is widely accepted and implemented as a solution to the power quality problems in utility, industry and commercial applications. This paper proposes the design of a shunt active power filter under the condition of voltage sag, unbalanced loads...
The DC-bus voltage self-regulating of Hybrid Active Power Filter (HAPF) is not only critical to compensation performance, but also to the safe operation. Traditional controller, e.g. P or PI, has disadvantages for these applications. Regarding the popular shunt HAPF with passive and active filters in serial connected, this paper presents a novel controller for the DC-bus voltage self-maintaining....
This paper deals with the power flow analysis and control strategy research of unified power quality conditioner (UPQC). A UPQC is a combination of shunt and series active power filter (APF), sharing a common dc link. It can compensate almost all power quality problems such as voltage harmonics, voltage unbalance, voltage flickers, voltage sags, voltage swells, current harmonics, current unbalance,...
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...
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