Load current balancing for 4-wire systems using harmonic treated TCR based SVCs

Abstract

<p>In this paper, a harmonic-treated thyristor-controlled reactor TCR is presented as a linearized harmonic-free compensating susceptance controllable in inductive and capacitive modes. The harmonic-treated TCR is a traditional TCR conditioned in such a manner that it can respond continuously and linearly to capacitive and inductive reactive current demands without noticeable harmonic association or active power contribution. The conditioned configuration is produced by equipping the TCR with self-harmonic suppressing and filtering circuitries, which guarantee harmonic cancellation with minimal no load operating losses. The harmonic treated TCR avoids the need to high power harmonic filters required to treat the harmonics of the traditional TCR. The devised susceptances are used to build a load current balancing system for grounded loads in a 380-V, 50Hz power distribution system. Both the compensating susceptances and the load current balancing system were designed and tested on PSpice. The simulation results have demonstrated the linearity, control continuity, and harmonic cancellation of the proposed harmonic-treated TCR as a fast response compensating susceptance reliable for load current balancing purposes. The proposed load current balancing system revealed superior treatment to various unbalance conditions, thus it is deservedly promoted to have the feasibility of supporting grids having fast varying loads.</p>

Balancing of four wire loads using linearized H-bridge static synchronous compensators

“…Two static compensators are required to accomplish current balancing of 4-wire loads [9], [15], [26]. The first compensator is built using three similar susceptances connected in delta-form, whereas the second one is built of three identical susceptances connected in star-form.…”

“…Static Var compensators (SVCs) and static synchronous compensators (STATCOMs) are usually exploited in the treatment of many issues concerning power quality like harmonic's association, voltage unbalance and unbalanced loads [1]- [26]. Unbalanced loads and poor power factor usually lead to significant losses in both generation station and transmission system.…”

“…Load balancing systems are usually built of compensating susceptances to accomplish two main functions, which are reactive current compensation and balancing of active currents [9], [15], [26]. The Int J Reconfigurable & Embedded Syst ISSN: 2089-4864  Balancing of four wire loads using linearized H-bridge static synchronous … (Abdulkareem Mokif Obais) 463 compensating susceptances are required to be linearly controlled in both capacitive and inductive modes in order to accomplish reliable load current compensation [6], [24].…”

Analysis of single-phase cascaded H-bridge multilevel inverters under variable power conditions

“…This article depicts high power voltage source inverters and very commonly used multistage inverter techniques, including neutral point inverters. This article proposes the working condition of each method and evaluates the most suitable modulation methods, mainly focusing on the modulation methods proposed in this field [9], [10]. The cascaded multistage inverter synthesizes the average voltage result based on the series association of the power cells using a very less voltage element configuration [11].…”

Intelligent Integrated Approach for Voltage Balancing Using Particle Swarm Optimization and Predictive Models

“…Diferent voltage balancing techniques have been proposed to ensure that the voltages in the three phases of the system are equal, leading to better performance, improved energy efciency, and reduced equipment damage [8]. Te use of compensators such as static synchronous compensators (STAT-COMs) has shown promising results in voltage balancing in three-phase power systems [9][10][11]. In the next section, an overview of recent developments and state-of-the-art techniques for voltage balancing in three-phase power systems will be presented.…”