Serwis Infona wykorzystuje pliki cookies (ciasteczka). Są to wartości tekstowe, zapamiętywane przez przeglądarkę na urządzeniu użytkownika. Nasz serwis ma dostęp do tych wartości oraz wykorzystuje je do zapamiętania danych dotyczących użytkownika, takich jak np. ustawienia (typu widok ekranu, wybór języka interfejsu), zapamiętanie zalogowania. Korzystanie z serwisu Infona oznacza zgodę na zapis informacji i ich wykorzystanie dla celów korzytania z serwisu. Więcej informacji można znaleźć w Polityce prywatności oraz Regulaminie serwisu. Zamknięcie tego okienka potwierdza zapoznanie się z informacją o plikach cookies, akceptację polityki prywatności i regulaminu oraz sposobu wykorzystywania plików cookies w serwisie. Możesz zmienić ustawienia obsługi cookies w swojej przeglądarce.
To insure reliability in electrical networks, loads are supplied by more than one source. In this paper a transfer scheme using two Static Transfer Switches (STS) located remotely is presented for transferring the feeder load to an alternate source that is out of phase from the primary (preferred source). The objective is to have a minimum disruption to the feeder voltage in terms of the dead time...
Virtual synchronous generator (VSG) control strategy has received wide attention since it was proposed. In this article, the basis implementation of VSG, namely active and reactive power decoupling control, is discussed. Through analyzing the traditional power decoupling mechanism and its restriction in the medium and low voltage micro-grid, a new power decoupling scheme is proposed which combines...
In this paper a real-time short-circuit calculation method for large-scale distribution systems with a high penetration of distributed generators is proposed. Recent years have witnessed increasing penetration of distributed generators. Thus, distribution systems have become active, where the fault current flow is no more straightforward. Additionally, modern distributed generator's models differ...
Due to rapid growth of power demand and economical and environmental restrictions for transmission and generation expansion, future power systems will be operating close to their stability limits. Critical modes of the system that are near stability limits can be influenced by unpredictable contingencies and even lead to cascading failures and blackouts. Therefore, maintaining sufficient security...
This work focuses on the analysis of the transient voltage stability at the point of interconnection (POI) of offshore wind farms following faults on the collector system. In particular, this study studies offshore wind farms that use an AC export system to transfer generated power onshore and investigates transient voltage stability under the influence of operating reactive power support equipment...
This paper analyzes two different transportation electrification charging schemes, i.e., an embedded wireless power transfer system and an overhead catenary wire system, for use in range extension of electric vehicles on rural highways. The efficiency, feasibility, and benefits of the two schemes are examined. Electric vehicles currently lack widespread popularity mainly due to battery limitations,...
The power electronic grid interface of converter-based energy systems such as wind turbine-generators (WTGs) is modifying the dynamics governing power systems. For a fundamental understanding of the impact of power electronic interface on the electromechanical modes, that is, the synchronizing and damping torque on synchronous machines, this paper provides a small-signal analysis about the impact...
Ever increasing nonlinear loads and supplies are changing dynamics of the electrical network. The levels of harmonics are on the rise and polluting more and more of the electrical network, posing new challenges before the designers and operators. To maintain the present power quality levels and to improve the performance of the electrical network, many control schemes and devices like Active Power...
To address the environmental concerns throughout the world, many new power sources, such as renewable energy, are being introduced. In order to maintain the reliability and stability of the system while integrating these inputs, many systems have started integrating battery energy storage systems. However, the introduction of such system has been very slow due to its high capital costs. Therefore,...
In this paper, a novel application of Artificial Neural Networks (ANN) is deployed to prevent blackout in a microgrid after N-1-1 contingency condition. In fact, microgrids are vulnerable to disturbances and abnormal conditions due to their inherent small inertia. Therefore, stability of microgrids after a disturbance turns into a challenge in power systems. The key contribution of this paper is to...
This paper proposes a new Z-source inverter architecture that does not require filtering at the output side to generate smooth ac voltages. Also, it provides a control strategy based on the concept of Model Predictive Control (MPC) for the proposed inverter. Since each switch of the proposed inverter makes a specific impact on the output of the inverter, MPC is a proper method to control the proposed...
Bidirectional and wireless power delivery to electric vehicles (EVs) or vehicle-to-grid (V2G) applications can be realized through bidirectional inductive power transfer (BD-IPT) technology but typically requires a three-stage power conversion process. This paper proposes a novel single-phase AC-AC BD-IPT system that requires only a two-stage power conversion process to facilitate wireless power transfer...
This paper presents a new approach for the optimization of photovoltaic-wind hybrid systems with battery storage to meet the load requirements. In this study, a 24-hour ahead energy management for a microgrid is utilized. The objectives aim at raising efficiency of energy utilization, minimizing operational cost and reducing environmental effects of energy usage. Also a demand response (DR) program...
Diverse grid structures in HVDC systems are generally possible. Though HVDC fault detection methods from overcurrent to derivative detection have recently been proposed, a broad discussion about reasonable fault localization is mostly absent. A MATLAB Simulink model with four different transmission line scenarios was developed for application-oriented considerations of short circuit fault detection...
In this paper, Compressed Air Energy Storage (CAES) as a popular technology for wind energy storage, is mathematically integrated with a hydraulic wind power system. Hydraulic machinery as prime-movers is utilized to gain the benefit of eliminating costly and heavy gearboxes. The goal of this work is to improve the power delivery performance while maintaining a stable frequency generation in a 600kW...
Controllable ac sources, sometimes referred to as grid simulators, are becoming more common for grid integration testing of inverters as new grid interactive inverter functions develop. Due to the relatively niche application, high power grid simulators are often made by repurposing commercial drives with additional systems integration by the manufacturer or end user including filters, transformers,...
This paper presents a load sharing method applied in a distributed micro grid system. The goal of this method is to balance the state-of-charge (SoC) of each parallel connected battery and make it possible to detect the average SoC of the system by measuring bus voltage for all connected modules. In this method the reference voltage for each battery converter is adjusted by adding a proportional SoC...
Due to large-scale renewable energy installation, frequency regulation is becoming more important and more difficult in power system. Battery energy storage system (BESS) is the one solution to this problem. It is assumed that effectiveness of installing BESS into power systems depends on its generation mix and control systems of frequency regulation. However, the optimal size of BESS has been discussed...
Surface-mounted permanent magnet (SMPM) ma chines have been proposed in which multiple magnet grades are used to shape the airgap flux density distribution to reduce torque ripple and vibration. A simple application of this concept is to mix permanent magnets of different grade but equal depth in a modular permanent-magnet pole arrangement (MPMP). In this work, the idea of combining multiple magnet...
Podaj zakres dat dla filtrowania wyświetlonych wyników. Możesz podać datę początkową, końcową lub obie daty. Daty możesz wpisać ręcznie lub wybrać za pomocą kalendarza.