The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
A model of power demand represents the foundation of any intelligent Energy Management System, and its accuracy is the key factor determining the performance of such system. In order to improve the accuracy of the modeling process, a multi-model approach based on a Hierarchical Clustering of similar load behaviors is presented. The clustering algorithm joins similar data subsets in groups that are...
Load identification is an important issue in power system representations to ensure that simulations will reproduce the dynamic response of a system during a disturbance. For a load model to be accurate, its parameter must be appropriately estimated by a parameter fitness algorithm. The success of the estimation depends mainly on the availability of a good initial parameter guess. If it is not available,...
In hybrid energy systems, batteries and supercapacitors are usually taken as storage mechanisms for smoothing output power, start-up transition, and various load conditions. As a result, developing hybrid power conversion systems has become an attractive research topic. In this study, a compact non-isolated bidirectional DC-DC converter is proposed to interface two DC power sources, which mainly benefit...
DC-DC converters lie at the heart of power electronic systems, finding usage in popular applications like Switched Mode Power Supplies (SMPS). Such demanding applications invariably require constant voltage irrespective of any changes on the load or input side. The un-modeled dynamics and external/internal disturbances make this objective even more challenging. This puts strict restrictions on the...
This paper deals with the development of a PSpice based evaluation platform for high power IGBT devices. The purpose of this platform is to provide useful information for the design and the assessment of converter cells for potential high power applications. An extended version of Hefner model is presented for high power, high voltage IGBTs taking into account temperature variation. A parametric analysis...
Boost converters are used for high voltage supplying, and they generally have to use large capacitors to suppress output voltage variations. However, this characteristic makes the converter system very large. In this paper, three load current feedforward control methods, which are considered an unstable zero, are proposed for the boost converter. The proposed methods suppress voltage variation compared...
The power losses of three-level neutral-point-clamped (NPC) converters and their AC-filters with iron and amorphous core inductors designed for a bipolar low voltage direct current (LVDC) distribution network are evaluated. The main objectives of the LVDC distribution network are improved energy efficiency, power quality and reliability and higher power transmission capacity and integration of ICT...
DC to AC conversion technology has succeeded in obtaining high power quality (voltages and currents) using multilevel inverters. These inverters can generate several levels of voltage that reduce the harmonic distortion of the generated sine waves in the AC side. However, the output voltages always are discrete, so a non-negligible harmonic distortion remains. This distortion can be reduced by increasing...
Rapidly increasing penetration of renewable energy sources into conventional power distribution systems has led to the rise in power electronic converter dominated power distribution systems. However, it has been a well established that the presence of tightly regulated point-of-load (POL) converters in the power distribution system, which act as Constant Power Loads (CPLs), cause serious stability...
This paper deals on control strategy and analyzing power flow between home integrated photovoltaic system (PVS), plug-in hybrid electric vehicle (PHEV) and distribution network The neutral point clamp (NPC) multilevel inverter is the main element that allows interfacing between the different energy sources and receptors. The combination of synchronous reference frames (SRF) and indirect control algorithms...
For high-precision control of a two-inertia system, information of both the drive side and the load side is usually required for obtaining high control bandwidth. In order to reduce the implementation cost and space, a novel control method, which employs the load side information only, is proposed using a high-resolution encoder which is today widely used in various fields. Simulation and experimental...
This paper provides a quantitative and comparative study on efficiencies of a battery semi-active hybrid energy storage system (HESS) and a battery-only system. The discussion is based on the equivalent series resistance (ESR) circuit models and a pulsed current load. It is theoretically proved that the efficiency difference between the two systems depends on the variance of the load current, the...
The state-of-the-art of induction heating technology requires more and more multivariable control systems able to provide a suitable response for a wide set of vessels to be heated. The goal of this paper is to propose a small signal model of a multivariable system, a dual half-bridge series resonant inverter sharing a common resonant capacitor. A Phase Shift Square Wave Modulation (PSSWM) is considered...
This paper presents an intelligent agency (set of agents) to harmonize the local demand and on-site energy resources. Demand Response is one such resource that has a significant potential in managing the distribution systems with large number of intermittent sources of energy. Demand response is a load management strategy to flatten the system load curve by motivating the customers to adjust their...
The use of real time digital simulation of large power systems is widely spreading due to its high precision result and increasing computing capability. However, in many cases, especially when large power system networks are to be modeled, the interconnection data and parameter data are available in flies which are used as input to simulation programs. Most transmission utilities use dynamic studies...
Power hardware in loop (PHIL) is a simulation technique which allows testing of a power hardware under test (HUT) under various operating conditions. Using PHIL simulations, the behavior of power HUT can be examined when it is integrated to the system without building the complete system. In this paper, various design aspects to construct a PHIL simulator are described. Details of necessary system...
This paper presents methods and results for experimental performance assessment using Real-Time Hardware-in-the-Loop (RT-HIL) simulation of an Excitation Control System (ECS) for both terminal voltage regulation and power oscillation damping. The ECS configured for this study is Unitrol 1020 from ABB and its performance is assessed for both Automatic Voltage Regulator (Auto) and Field Current Regulator(Manual)modes...
The detection of bearing damage using the stator current analysis is an important issue in condition monitoring. The modeling of a bearing damage can help to generate data for different loads and faults. These simulation data can be used to develop fault detection and classification algorithms. The aim of this work is to develop a model for the bearing damage effects, which enables the simulation...
This paper proposes a discrete-time sliding mode current observer (DSMCO) that relies only on the measure of the voltage between a distribution static compensator (DSTATCOM) and a self-excited induction generator (SEIG). Thus, the proposed observer reduces the overall cost of the voltage regulator system, however, the current sensor's cost is significant. The proposed algorithm is also adaptive, because...
This paper proposes a discrete-time super twisting sliding mode control (DSTSMC) based on state predictive observer for voltage regulation of a distribution static converter reactive (DSTATCOM) plan with na isolated self-excited induction generator (SEIG). The state predictive observer estimates the state variables of the system one step ahead, so that the discrete-time sliding mode controller generates...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.