scholarly journals A Fuzzy adaptive hysteresis band controller for three phase four wire UPQC

2018 ◽  
Vol 7 (2.8) ◽  
pp. 652
Author(s):  
S Shamshul Haq ◽  
D Lenine ◽  
S V. N. L. Lalitha
Keyword(s):  
Power Quality ◽  
Distribution System ◽  
Pulse Width Modulation ◽  
Simulation Analysis ◽  
Control Strategies ◽  
Neutral Current ◽  
Transient Conditions ◽  
Three Phase ◽  
Hysteresis Controller ◽  
Fuzzy Adaptive

Unified Power Quality Compensator (UPQC) is used to protect the sensitive loads in the distribution system from voltage and current disturbances. The compensation capability of UPQC depends on the control strategies used for shunt and series converters. Conventional adaptive hysteresis controller pulse width modulation technique had failed to track exactly during transient conditions and disturbances at load and source side. In paper fuzzy adaptive hysteresis controller is proposed for three phase four wire UPQC for compensating voltage sag/swell, current harmonics, voltage harmonics and neutral current compensation. Fuzzy adaptive hysteresis controller can effectively compensate the power quality problems during the transient conditions. A comparative simulation analysis of proposed and conventional methods are presented   in this paper using MATLAB/SIMULINK tool.

scholarly journals Power Quality Improvement using UPQC with Single and Three-Phase Non-linear Loads in Countryside Areas

2019 ◽  
Vol 9 (4) ◽  
pp. 18-24
Author(s):  
Shuchi Vishnoi ◽  
Keyword(s):  
Power Quality ◽  
Distribution System ◽  
Single Phase ◽  
Phase Distribution ◽  
Control Strategies ◽  
Electrical Power ◽  
Synchronous Reference Frame ◽  
Three Phase ◽  
Non Linear ◽  
Distribution Grids

This paper is intended to simulate a power quality conditioning device, Unified Power Quality Conditioner (UPQC), in countryside areas for non-linear loading. From past decades there is much increase in the requirement of the good quality electrical power in single phase distribution grids established in these locations. Due to technical advancement, three-phase loads are practiced more than single phase loads so that the demand for three phase distribution grids is growing. But the installation process of three-phase grids, at countryside areas, is not an economic option and to get access to these systems is a very challenging task. So a neighbouring three-phase distribution system is required to be established at the location, where single-phase to three-phase UPQC with single wire earth return is appropriate for the end user due to economic considerations. A dual compensation strategy is implemented to obtain the reference quantities for controlling the converters. The proposed idea is accomplished to eliminate voltage harmonics and mitigate further instabilities and power quality problems. This system allows the balanced and regulated voltage with lower harmonic content. Synchronous Reference Frame (SRF) based controllers are considered to organize the input grid current and the load voltages of the UPQC. The present prototype under consideration analyses and validates the compensation and controlling techniques using PI controller. The control strategies are simulated using MATLAB/SIMULINK.

3P4SW and 3P9SW Based UPQC Topologies to improve the Power Quality in Medium Voltage Distribution System

2019 ◽  
Vol 13 ◽  
Author(s):  
Senthil Vadivu U ◽  
B. K. Keshavan
Keyword(s):  
Power Quality ◽  
Power Distribution ◽  
Distribution System ◽  
Simulation Analysis ◽  
Switching Loss ◽  
Power Distribution System ◽  
Medium Voltage ◽  
Three Phase ◽  
Quality Issues ◽  
Power Quality Conditioner

Background: The undesirable effect of power quality issues on distribution system due to power electronics based controllers; it is highly desired to design a novel power quality conditioner with a minimum number of switches. The proposed configuration reduces the switching loss and also effectively alleviates the power quality issues. This paper introduces the configuration of 3P4SW (Three Phase Four Switch) UPQC (Unified Power Quality Conditioner) for both shunt and series APF (Active Power Filter) as well as 3P9SW (Three Phase Nine Switch) UPQC topologies, which can be implemented in medium voltage power grid. The major challenge of phase balance with only four switches in UPQC is accomplished by adaptive Self-tuning PID using neuro-fuzzy logic control and adaptive reference current generation scheme. This controller improves sag and swells compensation with better angle control via shunt and series converter performance and passive components design. The efficacy of proposed topology is tested on MATLAB/Simulink software and results are compared with the existing three phase six switch configuration (3P6SW). Methods: The main objective of this work is to identify the most suitable configuration of UPQC to mitigate the power quality issues in power distribution system. to achieve this goal a Synchronous reference frame theory is used to generate the pulses in the back to back connected VSI in UPQC. Results: The suggested topologies should not compromise with the nominal functions of the controller; hence from the simulation analysis it clear that the 3P4SW UPQC, as well as 3P9SW UPQC topologies, will fulfill the given constraints and also it maintains the magnitude of the load voltage as per the standard values. Also, the THD percentage is maintained well within the IEEE standard. Thus the proposed topologies can be implemented for medium voltage distributed system with improved power quality.

scholarly journals Possible Power Quality Ancillary Services in Low-Voltage Grids Provided by the Three-Phase Damping Control Strategy

2020 ◽  
Vol 10 (21) ◽  
pp. 7876
Author(s):  
Dimitar V. Bozalakov ◽  
Joannes Laveyne ◽  
Mohannad J. Mnati ◽  
Jan Van de Vyver ◽  
Lieven Vandevelde
Keyword(s):  
Power Quality ◽  
Control Strategy ◽  
Distribution System ◽  
Low Voltage ◽  
Control Strategies ◽  
Ancillary Services ◽  
Phase Damping ◽  
Damping Control ◽  
Three Phase ◽  
System Operator

The share of renewable energy is increasing because of environmental concerns and favorable economic conditions. The majority of the distributed energy resources, connected to the low-voltage grid, are inverter-connected units. These inverters are controlled by using specially developed control strategies to determine the power injection between the primary source and the grid. In the past, the connection of distributed energy resources was based on the connect-and-forget principle, but this approach leads to severe power quality problems. Nowadays, more sophisticated control strategies need to be developed, so that ancillary services can be provided to the distribution system operator, which will allow further increase of renewable share in the distribution grids. This article examines the technical capabilities of the three-phase damping control strategy to provide ancillary services to the distribution system operator. Besides the three-phase damping control strategy, the article also compares the classical positive-sequence control strategy. Active power drooping and reactive power exchange are combined with these control strategies and the effect on the annual energy production, power quality, and grid performance is assessed. The simulations are conducted on a Matlab/OpenDSS platform in a time series simulations.

scholarly journals Power Quality Enhancement of Three Phase Four Wire UPQC in Distribution System using Neural Network

2019 ◽  
Vol 8 (2S8) ◽  
pp. 1124-1132
Keyword(s):  
Power Quality ◽  
Distribution System ◽  
Neural System ◽  
Control Line ◽  
Electrical Cable ◽  
Three Phase ◽  
Power Quality Conditioner ◽  
Ultimate Objective ◽  
System Controller ◽  
Scattering Systems

The essential focus of this endeavor is examination of three phase four wire UPQC available for use structures by neural framework. The bound together power-quality conditioner (UPQC) is used to calm the current and voltage-related power-quality (PQ) issues in the meantime in three-arrange four-wire course structures. Among most of the PQ issues, voltage hang is a significant issue in three-arrange four-wire scattering systems. In this paper, another procedure is proposed playing out the plan parallel electrical cable trim. As such, despite when only a three-organize three-wire control structure is available at a plant site, the UPQC can do control line pay for presented loads that require a fair-minded channel to work. Not exactly equivalent to the control philosophies used in most of UPQC applications in which the controlled sums are nonsinusoidal, this UPQC uses a twofold pay technique, with the ultimate objective that the controlled sums are continually sinusoidal. Neural System controller have been used to make the proposed methodology online for least real power implantation with UPQC by using the PSObased data for different voltage rundown conditions. In the proposed system PI controller substituted by NN controller for better precision.

scholarly journals Review of three-phase inverters control for unbalanced load compensation

2019 ◽  
Vol 10 (1) ◽  
pp. 242 ◽  
Author(s):  
Raef Aboelsaud ◽  
A. Ibrahim ◽  
Alexander G. Garganeev
Keyword(s):  
Power Quality ◽  
Control Strategies ◽  
Power Electronic ◽  
Distributed Energy ◽  
Nonlinear Loads ◽  
Load Compensation ◽  
Research Areas ◽  
Three Phase ◽  
Unbalanced Load ◽  
Three Phase Inverter

<span>In the microgrid systems, three-phase inverter becomes the main power electronic interface for renewable distributed energy resources (DERs), especially for the islanded microgrids in which the power quality is easily affected by unbalanced and nonlinear loads, this is due to the fact that the voltage and frequency of the microgrid are not supported by the main power grid but determined only by the inverters. Therefore, the compensation of the load unbalances and harmonics in autonomous microgrid inverters are getting more attention in power quality research areas. The main purpose of this paper is to represent an overview of the control strategies of various inverters for unbalanced load compensation</span>

scholarly journals Review on Power Quality Enhancement and its effects on Micro Grid

IJOSTHE ◽  
2020 ◽  
Vol 7 (1) ◽  
pp. 5
Author(s):  
Ankeeta . ◽  
Vasant Acharya
Keyword(s):  
Power Quality ◽  
Distribution System ◽  
Power Plants ◽  
Control Strategies ◽  
Renewable Energy Sources ◽  
Electrical Power ◽  
Small Scale ◽  
Quality Enhancement ◽  
Reliability Of Operation ◽  
Unbalanced Loads

Power generation through the renewable energy sources has become more viable and economical than the fossil fuel based power plants. By integrating small scale distributed energy resources, microgrids are being introduced as an alternative approach in generating electrical power at distribution voltage level. The power electronic interface provides the necessary flexibility, security and reliability of operation between micro-sources and the distribution system. The presence of non-linear and the unbalanced loads in the distribution system causes power quality issues in the Microgrid system. This paper explores and reviews different control strategies developed in the literature for the power quality enhancement in microgrids.

Realization of Fixed Switching Frequency Direct Power Control for Three-Phase AC/DC Converter

2013 ◽  
Vol 385-386 ◽  
pp. 1216-1219
Author(s):  
Yun Liang Wang ◽  
Yong Le Zhao
Keyword(s):  
Power Control ◽  
Pulse Width Modulation ◽  
Control Strategies ◽  
Modulation Method ◽  
Switching Frequency ◽  
Direct Power ◽  
Direct Power Control ◽  
Three Phase ◽  
Simulation Results ◽  
Virtual Flux

This paper presents fixed switching frequency direct power control (FSF-DPC) for three-phase AC/DC converter. Sensorless control strategies based on virtual-flux can optimize the performance of the system. In this paper, realization of pulse width modulation method for FSF-DPC is presented. The simulation results show that the system running performance is good.

Research and Application of SVC Technology in Grid

2014 ◽  
Vol 543-547 ◽  
pp. 878-883
Author(s):  
Jun Dong ◽  
Jian Guo Xu ◽  
Hao Zhang ◽  
Yu Jie Pei ◽  
Xian Feng Li
Keyword(s):  
Power Systems ◽  
Power Quality ◽  
Distribution System ◽  
Power Flow ◽  
Reactive Power ◽  
Control Strategies ◽  
Load Capacity ◽  
Flow Distribution ◽  
Nonlinear Load ◽  
The Impact

The cause serious deterioration in power quality problems for the growing impact and nonlinear load capacity, introduced SVC device in the role of modern power systems and applications. According to the lack of adequate regional dynamic reactive power regulation means to cause voltage fluctuations, harmonics exceeded the actual situation, through analysis and simulation of the existing 66kV grid power quality conditions, refers to the necessity of application of SVC, the compensation capacity for SVC, filter capacitor system parameters and control strategies were designed, the results show improved 220kV SVC reactive power flow distribution system, reducing the system once or twice a net loss, reducing the impact and harmonic interference voltage caused by nonlinear loads, system security, economic operation of great significance.

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