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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 present three-phase four-wire active filter for power line conditioning (PLC) to improve power quality in the distribution network. The active power filter (APF) is implemented with PWM based current controlled voltage source inverter (VSI). This VSI switching signals are generated through proposed three-level hysteresis current controller (HCC) that achieves significant reduction in the...
Due to a large amount of non-linear power electronic equipments, impact and fluctuating loads (such as that of arc furnace, heavy merchant mill and electric locomotive, etc), problems of power quality have become more and more serious with each passing day, as a result Active power filter (APF) gains much more attention due to excellent harmonic compensation. But still the performance of the active...
This paper presents a novel synchronous reference frame (SRF) controlled five-level cascaded multilevel inverter based shunt active filter for power line conditioners (PLCs) to improve the power quality in the distribution system. The SRF based compensation is developed by sensing load currents only, which require for harmonics and reactive power compensation due to non-linear loads. The attempt is...
Improving performance, energy efficiency and reduced carbon emissions in industrial installations require the enhancement of power quality and reduced EMC/EMI emissions. In this frame, active power filters for improving power factor and harmonics mitigation are gaining interest as FACT devices for smart power networks. This work presents the simulation and analysis of a predictive control method applied...
Compared to traditional load current detection type Active Power Filter (APF), source current detection type APF belongs to closed-loop control in control theory, which can improve its filtering performance dramatically. At first, this paper introduces two conventional APF control schemes with source current detection-proportional control and non-harmonic detection control. By analyzing, we points...
This paper proposes the Unified Hybrid Power Quality Conditioner (UHPQC). The proposed topology manipulates, at the same time and in continuous way, the displacement power factor and also it mitigates the dominant harmonic component of the line current. The structure is composed by a small rating Active Power Filter (APF) in series with a single passive filter. The main objective of this topology...
In this paper optimal control strategies for active power filters working under non-sinusoidal voltage are approached using Pareto Optimal based multi-objective optimization. Where the voltages are distorted, there is some conflict between power factor improvement, current harmonics mitigation, and cost issues. The Strength Pareto multi objective optimization approach is used to simultaneously optimize...
In this paper, a neural network based reference current computation method for active power filter (APF) control under non-ideal mains voltage with different load condition is proposed. The neural network controller has been designed to extract fundamental frequency components from non-sinusoidal and unbalanced currents. These fundamental frequency components will be used as unit templates. The APF...
With development of modern industry, more and more non-linear loads are used in power system, resulting in increasingly severe harmonic pollution. Harmonic becomes main factors affecting power quality. Active power filter, as the most effective method to eliminate harmonic, has been paid more and more attention recently. The current compensation performance of active power filter depends on the controller...
The configuration and principle of shunt active power filter is introduced briefly in this paper. A digitally controlled shunt active power filter based on double DSP is designed for the three-phase four-wire system. The main circuit of the shunt active power filter selects a four-leg voltage-source inverter, and a dynamic hysteresis-band current control is used to track the current. A control strategy...
In this paper, a novel neural network based phase locked loop (PLL) less reference current computation method for active power filter (APF) control under non-ideal mains voltage conditions with different load condition is proposed. The neural network controller comprises two similar adaptive linear neurons (ADALINE), and it has been designed to extract fundamental frequency components from non-sinusoidal...
This paper presents a new method for harmonic and reactive power compensation with power factor improvement using an artificial neural network (ANN) and a new control algorithm for active power filter (APF) for power quality conditioning for variable load under non-ideal mains voltage conditions. The neural network controller comprises two similar adaptive linear neurons (ADALINE), and it has been...
The paper presents considerations how application of high power inverter-based power supply units affects supply conditions of industrial plants as well as how it influences power quality in MV power supply grids. Scope of the paper topics covers the effect of LC resonance that occurs between an output filter of the inverter, active compensating filters and inductances of the power supplying grid...
Unified power quality conditioner is a powerful tool to settle the power quality problems. In reason of power devices technology promotion and their cost reduction, it is predicable that UPQC will attain wide spread usage. Therefore its lifetime and efficiency would become important issues. In this paper a control system is developed that devolves compensation of short duration and shallow depth voltage...
This paper presents and compares the performance of two controllers namely Fuzzy Logic and Proportional Integral applied to a voltage source inverter/converter operating as an active power filter. The active power filter is operated to compensate harmonics and reactive power generated by the non-linear load and power factor correction simultaneously. This work is performed in order to make an accurate...
This paper deals with a novel configuration of single-phase hybrid active power filter. One of the advantages of the proposed hybrid filter is its adjustable capability to determine voltage rating and current rating of active power stage by selecting appropriate values for its passive filter parameters. Equivalent circuit of proposed hybrid filter has been presented and its filtering characteristic...
This paper focuses on the implementation of a three-phase four wire current-controlled voltage source inverter (CC-VSI) as both power quality improvement and PV energy extraction. For power quality improvement, the CC-VSI works as a grid current-controller shunt active power filter. Then, the PV array supported by the hill climbing type of a MPPT controller is coupled to the DC bus of the CC-VSI....
The share of distributed generation (DG) within the distribution network increases strongly. A lot of these DG units are driven by renewable energy sources (RES). Up to now, these units only inject active power depending from the availability of their primary source. In future on the one hand DG units have to contribute to grid stability, but on the other hand DG units can provide additional functionalities...
Model-based simulations by commercial simulation packages, such as EMTP/ATP, PSCAD/EMTDC and MATLAB/SIMULINK often provide convenience for testing and analyzing the power quality studies. Nowadays, the real-time simulation techniques are highly developed to enhance the capabilities of traditional off-line simulations. This paper presents the real-time simulation techniques for a shunt active passive...
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