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The introduction of plug-in electric vehicles (PEVs) in the electrical system is bringing various challenges. One of the recent solutions to deploy the potentials of PEVs in the system is through PEV parking lots (PL). The PLs not only provide a place for the PEVs charging requirements, but also give the possibility of exploiting the vehicle-to-gird (V2G) potential of PEVs in a more efficient manner...
Power load models are significant for power system transient analysis and voltage stability. However, as the load behavior is time varying in nature, the model parameters are also time varying and online parameter estimation algorithms are thus required. In this work we cast static and dynamic load models in linear parametric form and use them as a baseline to develop online parameter identification...
Many graphical alternatives are useful to demonstrate critical characteristics of distribution systems such as voltage regulation or power flow. The visualization of electrical variables can also be an effective approach to analyze, compare and evaluate large-scale systems. However, visual analysis of large power distribution systems is increasing in complexity for operational and research purposes...
Undamped power and voltage swings of synchronous generators due to severe disturbances may make power systems unstable. To tackle this problem, this paper proposes a control scheme of active and reactive power outputs of a photovoltaic (PV) generator equipped with power oscillation dampers (PODs). The PODs with second-order lead/lag structure are installed in the active and reactive power control...
This research proposes technical and financial evaluation for investment of harmonic mitigation in power network. Main proposal of research is analysis of harmonic impact and harmonic solution by regarding to economic decency for investment. The parallel resonance is harmonic impact that will be mentioned in this research because it is a problem that is mostly emerged in industries that contain non-linear...
In this study, we analyzed the operational situation and cost for Tokyo Electric Power Company's service area by 2030, when a high penetration of variable renewable energy (VRE) sources will have been attained. Day-ahead unit commitment and real-time economic dispatch simulation were carried out by taking into account photovoltaic power yield forecasts and errors. The analysis allowed us to evaluate...
Integration of aggregated demand response into the wholesale electricity market is an emerging field of research. Contrary to conventional service providers, most of the demand side participants act voluntarily. However, due to wholesale market regulations, reliable and effective participation of huge numbers of customers is a vital task for aggregators. The existing retail programs aim to motivate...
When a hydro power producer wants to plan the production for the next day in an optimal way a precise and detailed model is needed. But when using this model to plan for a longer period of time the computational complexity increases. To overcome this problem there is a need to do a model reduction of the original system into a smaller equivalent system with almost the same properties. This paper compares...
Dynamic Inductive Charging appears to be an ideal solution towards increasing the limited travel range of Electric Vehicles (EVs). A thorough analysis is required on the development of a dynamic Inductive Power Transfer (IPT) system's control design, in order to ensure the operation at a maximum efficiency while transferring sufficient amounts of power. In this respect the bifurcation phenomenon shall...
This paper addresses the location of parking lots (PLs) to be used for plug-in electric vehicles (PEVs) by using a probabilistic traffic model and taking into account the PL participation in electricity markets. The PLs are used both for grid-to-vehicle and vehicle-to-grid. The system includes private or public charging stations only used for PEV charging. The traffic model considers the partitioning...
Analysis of load behavior in demand response (DR) schemes is important to evaluate the performance of participants. Very few real-world experiments have been carried out and quantification and characterization of the response is a difficult task. Nevertheless it will be a necessary tool for portfolio management of consumers in a DR framework. In this paper we develop methods to quantify and characterize...
This paper presents a deterministic unified unit commitment and economic dispatch model that integrates storage devices in the short-term power system scheduling under high renewable energy penetration. The presented model is a single multi-hour look-ahead real time tool that uses multiple time resolution to reduce its computational requirements. Operating on a rolling basis, the decisions of the...
Corrective control actions for Transient Stability Improvement (TSI) could offer a solution to possible problems arising in modern stressed power networks operating under higher level of uncertainty. A comparative analysis of the most widely used corrective TSI methods is presented in this paper. The impact of the different Corrective Measures (CMs) on transient stability is investigated for different...
A trade-off approach is suggested to calculate available transfer capability. An increase in the line load of one electric power system should not reduce benefit for another power system. Generation of a trade-off solution, i.e. a single procedure for line loading, is carried out using the modified state estimation and artificial neural networks.
For pumped storage hydropower plants with fixed-speed electrical machines, turbines typically operate between 70 and 100 percent of rated power whereas pumps usually run at constant load. If the fixed-speed machine is replaced with an adjustable-speed machine, the operating range of the pump increases, thereby increasing flexibility and enabling the provision of ancillary services in pump mode. This...
The Transmission System Operators (TSOs) in Europe are facing increasing challenges in both planning and operating their transmission systems. More integration of renewables increased the need for congestion management frequently. The highly variable energy output of renewables demands the expansion of existing network to accommodate them and managing power flows that are no longer centrally dispatchable...
Increasing distributed photovoltaic (PV) systems can lead to overloading of grid assets and voltage violations at grid nodes, especially in distribution systems. This raises the necessity to consider the future growth of installed PV capacity for the mid- and long-term planning process of distribution system operators (DSOs). Considering solar roof potential analysis derived from an airborne light...
Small-signal analysis is one of the most frequently used techniques to assess the operating conditions of power systems. Typically, this analysis is conducted by employing a phasor-based model of the power network derived under the assumption of balanced operating conditions. However, distribution networks and, amongst these, microgrids are often unbalanced. Hence, their analysis requires the development...
Travelling Wave Fault Locators (TWFL) allow a higher precision in most cases than typical impedance based fault location methods. One of the major problems with it, is the measurement of the arrival times of Travelling Waves (TWs). In this paper, a new method to compute the difference of arrival times of the first wavefront is presented. The method is based on the telegrapher's equations. The paper...
Loads have an important impact on the behavior of an islanded grid, yet they remain the main unknowns of the system. Electronic-based loads — like rectifiers in particular — are rarely studied in the context of unintentional islanding studies, in spite of the fact that the rate of electronic loads has strongly increased in the last decades. In this paper, the impact of electronic loads on islanding...
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