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 Battery Storage Integration in Voltage Unbalance and Overvoltage Mitigation Control Strategies and Its Impact on the Power Quality

Energies ◽  
2019 ◽  
Vol 12 (8) ◽  
pp. 1501 ◽  
Author(s):  
Dimitar Bozalakov ◽  
Mohannad J. Mnati ◽  
Joannes Laveyne ◽  
Jan Desmet ◽  
Lieven Vandevelde
Keyword(s):  
Energy Storage ◽  
Power Quality ◽  
Control Strategy ◽  
Control Strategies ◽  
Storage System ◽  
Energy Storage System ◽  
Voltage Unbalance ◽  
Phase Damping ◽  
Damping Control ◽  
Three Phase

The increased utilisation of distributed renewable energy sources in low voltage grids leads to power quality problems such as overvoltages and voltage unbalance. This imposes challenges to the distribution system operators to maintain the power quality in their grids. To overcome these issues, energy storage systems could be integrated together with the distributed energy resources and the stored energy could be used when needed to better improve power quality and achieve better grid performance. However, integrating an energy storage system introduces additional cost, therefore, determining the right capacity is essential. In this article, an energy storage system is combined with the classical positive-sequence control strategy and the three-phase damping control strategy. The three-phase damping control strategy is able to mitigate the voltage unbalance by emulating a resistive behaviour towards the zero- and negative-sequence voltage components. This resistive behaviour can be set on different values such that the desired voltage unbalance mitigation is achieved. Hence, the three-phase damping control strategy, equipped with the energy storage system is investigated under different values of the resistive behaviour. Both control strategies are investigated under the same conditions and the impact of the different capacities of the energy storage systems is investigated.

Voltage dip mitigation capabilities of three-phase damping control strategy

2015 ◽  
Vol 121 ◽  
pp. 192-199 ◽  
Author(s):  
D. Bozalakov ◽  
T.L. Vandoorn ◽  
B. Meersman ◽  
C. Demoulias ◽  
L. Vandevelde
Keyword(s):  
Control Strategy ◽  
Phase Damping ◽  
Damping Control ◽  
Voltage Dip ◽  
Three Phase

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.

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>

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