Controller Design of UPQC for Enhancing Power Quality in Distribution System

<span>The world community relied heavily on fossils energies but just after the big oil crisis the use of renewable energy has greatly increased and has become the main interest of many countries for its many advantages such as: minimal impact on the environment, renewable generators requiring less maintenance than traditional ones and it has also a great impact on economy. It is easy to get charmed by the advantages of using the renewable resources but we must also be aware of their disadvantages. One of the major disadvantages is that the renewable energy resources are intermittent and thus they have led scientists to develop new semiconductor power converters among which are the multilevel inverter. In this paper a new smart multi-level inverter is proposed so as to increase its levels according to the user’s needs and also to avoid the impact of shades and the intermittence on photovoltaic panels. We also propose a modification on the multicarrier aiming to reduce the harmonics. This modification introduces a sinusoidal wave compared with trapezoidal multi-carrier to generate the pulses. In order to obtain the line voltages and the total harmonic distortions (THD) MATLAB/SIMULINK is used.</span>

Section: Smart Multi-level Inverter 41 Shadesmentioning

confidence: 99%

A smart cascaded H-bridge multilevel inverter with an optimized modulation techniques increasing the quality and reducing harmonics

Babkrani¹,

Naddami²,

Hilal³

2019

“…Many solutions have been considered and proposed, many of which involve modifications to the traditional topology of multi-motor systems and/or incur significant costs. Mechanical or electrical auxiliary energy storage units [6], [7], unified power quality controller (UPQC) [8], [9], the application of converters with inductive elements, such as autotransformers, static power compensators (STATCOM) [10], static voltage regulator (SVR), dynamic voltage restorer (DVR) [11], [12] and energy storage devices including superconducting magnetic energy storage (SMES) [13]. These solutions, however, are still general in nature and have not been applied in multi-motor configurations.…”

Section: Introductionmentioning

confidence: 99%

Attenuation of voltage sags effects and dynamic performance improvement of a multi-motor system

Bensaid

Ba-Razzouk

Elharoussi

et al. 2022

In many continuous manufacturing processes such as paper, textile, winding and plastic extrusion, electric drives are frequently required to work in synchronization, often with high tolerances to ensure uniform product quality and avoid failure of the product. In a multi-motor system (MMS), voltage dips are the most common cause of the motor stoppage, and the transient loss of synchronism between motors can result in a complete system shutdown. This paper proposes a multi-motor system controlled by a Backstepping strategy to ensure servo-control and synchronization of induction motors. This technique includes indirect rotor field-oriented control (IRFOC), linear speed control, and mechanical tension control, of induction motors. Investigations of symmetrical voltage sag effects on speed, torque, and mechanical tension are also carried out. Simulation results obtained using Matlab®/SimulinkTM/SimPowerSystems® are presented to demonstrate the efficiency of the proposed control strategy.

“…According to the IEEE 519 [12] standard, several custom power devices are introduced [13][14][15][16][17]. These devices are designed to be installed in the consumer side to surpass the power quality problems.…”

Section: Introductionmentioning

confidence: 99%

Significant implication of unified power quality conditioner in power quality problems mitigation

Hasan

Othman

Rahman

et al. 2019

<p>This paper presents an analysis of a three-phase unified power quality conditioner (UPQC) in terms of design and performance. A back to back connection of a series compensator and a shunt compensator with a common DC-bus is utilized to build the UPQC model. The series compensator compensates the power quality problems such as grid voltage sags/swells for the grid side. During sag and swell condition, the compensated voltage is injected by the series compensator in phase with the point of common coupling (PCC) or out of phase with PCC. The load current harmonics is compensated by using the shunt compensator. The dynamic performance and the steady state of the designed model are analyzed by using MATLAB-Simulink under several disturbances such as PCC voltage harmonics, voltage sags/swells and load unbalancing using a nonlinear load. </p>