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This paper provides a circuit approach to the phenomenon of voltage unbalance emission due to line asymmetries in three-phase power systems. Indeed, it is well known that under the assumption of symmetrical phases, power systems are effectively analyzed through the symmetrical component transformation leading to uncoupled sequence circuits. In practical power systems, however, the assumption of symmetrical...
The connection of renewable energy sources to the grid, in a way that characterizes distributed generation, enables the optimization of local available natural resources. These sources should be managed in order to produce a distortion-free AC terminal voltage, and to inject in the grid the power that is not consumed by the local load. In the system here analyzed for connection of renewable energy...
This paper presents the use of a computational system, MATLAB/Simulink SimPowerSystem, as a tool for analysis of power quality (PQ) including distributed generation (DG) connected to smart girds. An electrical circuit model for DG, recloser, photovoltaic system-PV and loads located downstream and upstream from recloser is proposed in this study. The paper shows that this system allows to understand...
Data centers have grown to become big energy cconsumers. At this scale of power consumption, data centers play cconsiderable role in electric networks operation. However, being ca relatively new industrial scale consumer, data center requires cmore careful consideration and research to uncover its specifics cand better understand its requirements; and investigate data ccenter's impact on regional...
Power quality is one of the most significant current discussions in electric energy distribution systems. The issue of harmonics has been a controversial and much disputed subject within the field of power quality. Harmonic current originates from all types of nonlinear loads. This paper attempts to show the impacts of rapidly increasing share of nonlinear loads on harmonic distortion of urban distribution...
This paper presents a new moveable power quality (PQ) conditioner named convertible active power filter (CAPF) which aims to compensate for current quality (CQ) problems in the industrial, commercial or residential areas. The proposed CAPF has the capability and flexibility to change its compensation mode from load-to-load based on the variations of the load characteristics. This is absolutely necessary...
This paper proposes a novel custom power device based on distribution static compensator (DSTATCOM) with PID controller driven by the unified error signal (UES) from a multi loop dynamic error controller scheme. Both DSTATCOM and UES are modified to meet the requirements for voltage stabilization, voltage waveform disturbance compensation and power factor improvement. A complete simulation model of...
Distributed Generation (DG) has received increasing attention during the last decade. Advantage and constraints of DG application are well known to both DG owner and electric utility. Various technologies are available for DG units among them gas GenSet is, in particular, more attractive to the investors as the technology provides the control on DG generation. However, there are various financial...
this paper is devoted to validate a novel D-FACTS connected based on modified distribution static compensator (DSTATCOM) in an interconnected wind-grid system. The modified DSTATCOM is controlled by PID controller driven by a multi loop dynamic error controller scheme. A complete simulation model of the proposed system is developed in Matlab/Simulink Environment. The results show that the modified...
Low Voltage DC (LVDC) distribution systems have the potential to be considered as an efficient platform for facilitating the connection of more distributed energy resources. The applications of LVDC are still at an early stage due to the lack of mature experience and standards. Over and above, the protection challenges that are presented by integrating DC installations in existing AC systems are one...
This paper presents an overview of the minimal complexity level requirement for modeling generic grid-interactive inverter to conduct power flow, protection, stability and power quality studies. For each functional, control or protection block of the inverter system, it describes the appropriate level of complexity needed to perform each of the power system studies. This work serves as a foundation...
Assessing the impact on power quality due to electric vehicle charging implies to make of it a reliable process, including in the process the modeling of some basic elements involved in the process, such as the power grid, the charger and the battery. Each developed model must approach as close as possible to reality, including characteristic dynamics of those models. As such, this paper proposes...
The operational voltage of the hybrid power filter (HPF) is much lower than an active power filter (APF) when reactive power of inductive loads is compensated. The active power transfer capability of the HPF is utilized to achieve PV generator integration in this paper. The proposed system is a low cost solution for power quality conditioning and PV integration in modern buildings. The low dc voltage...
Power Quality is one of the critical issues when operating contemporary distribution networks. The increased interest in PQ is due to the increased employment of sensitive equipment loads and renewable generation technologies. Currently, the evaluation of PQ network performance is based on evaluating different phenomena separately, and a standardised way to evaluate the PQ as a whole for a bus or...
This paper proposes an analytical fault-tolerant method for cascaded H-bridge converters. In this case, this method has been implemented for a cascaded H-bridge converter with six cells per phase that is used in a medium voltage drive. The proposed method has been tested in a Simulink model of the thirteen-level cascaded H-bridge converter.
The article presents the results of the simulation research on the performance of Parallel Active Power Filters in the supply systems with various impedance and different topologies. What has been compared is a typical, the most commonly used Parallel Active Power Filter devices working on the basis of load current distortion and the device working on the basis of identification of network's voltage...
This paper proposes a framework for analyzing and improving the resilience of grid-edge power systems, by coordinating the use of local resources (generation, storage and flexible loads), as well as temporarily forming clusters of microgrids or cooperatives of smart homes. A methodology is proposed for improving grid-edge resilience in islanded conditions, which may occur when a fault or significant...
The family of extended power quality factors exsamenes in this paper. These are integral and differential coefficients of harmonics of current and voltage. On the example of simulation of different types of loading for nonsinusoidal sources are considered a quality of consumable current without the calculation of current.
The number of (hybrid) electric vehicles is growing, leading to a higher demand for electricity in distribution grids. To investigate the effects of the expected peak demand on distribution grids, a stress test with 15 electric vehicles in a single street is conducted and described in this paper. The test is conducted in a neighbourhood where both transformers and households are equipped with measurement...
This paper proposes a new topology for a three-phase AC/AC converter without DC. The presented topology is based on an direct AC/AC ĆukB2 bipolar matrix-reactance chopper. The considered solution is intended to control power flow and compensate voltage perturbations in the modern AC power grid with active loads (two-source system). The main difference in the proposed solution in comparison to a conventional...
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