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Surface discharge (SD), as one important partial discharge (PD) source, were measured in the test cell representing the surface discharge, with polycarbonate plate as the insulating material covered completely on the bottom ground electrode. This study compares PD patterns stimulated by sinusoidal voltage and by several forms of trapezoid-wave voltage, including the limiting cases of triangular and...
This paper presents a Quantum Particle Swarm Optimization (QPSO) applied to hour-ahead scheduling in Smart Grid (SG). The unforeseen events not considered in day-ahead scheduling, must be overcome when approaching intraday operation. This implies new constraints in hour-ahead formulation. The developed methodology aims to complement the day-ahead scheduling tools already available on the literature...
Combined cooling heat and power microgrid with renewable energy sources and plug-in electric vehicles (PEVs) offers an effective solution to energy-related problems, such as growing energy demand, increasing energy costs, environmental concerns and grid security. Taking the advantage of bidirectional power flow characteristic of PEVs and time-of-use pricing structure, this paper proposes an energy...
The overall efficiency of battery electrical storage systems (BESSs) strongly depends on auxiliary loads, usually disregarded in studies concerning BESS integration in power systems. In this paper, detailed electrical-thermal battery models have been developed and implemented in order to assess a realistic evaluation of the efficiency of NaS and Li-ion batteries. BESSs have been sized in order to...
Energy Storage Systems (ESS) are often proposed to mitigate the fluctuations of renewable power sources like wind turbines. In such a context, the main objective for the ESS control (its energy management) is to maximize the performance of the mitigation scheme.
Modeling of non-utility facility with generation and battery storage is presented. The operation strategy for non-utility facility is determined by solving a daily generation scheduling problem under a price-taking scheme. Numerical simulations are performed under various scenarios. It is shown that the optimal strategy is complex when either fuel supply is limited or electric utility allows buy-back...
The paper presents the DER aggregation solution that was deployed and tested in the frame of the Reflexe demonstrator project. This project brings together a consortium of industrial partners and research laboratories with the objective of examining all aspects of aggregating commercial and industrial flexibility in order to provide energy and ancillary services to the grid through the market. In...
The overall cable insulation condition can be monitored continuously by the implementation of an on-line partial discharge (PD-OL) monitoring system. It can both detect and locate the sources of PDs and also assess the insulation condition by using past data. The utilization of an accurate electromagnetic transient model is crucial for the accuracy of the system. Therefore, the well known Universal...
This paper addresses the problem of MicroGrid (MG) management including Electric Vehicles (EV) scheduling in a low voltage residential grid. The methodology uses a deterministic algorithm approach implemented in TOMLAB software. A realistic case study using a 25-bus MG with distributed generation, dispersed storage and EVs is provided to demonstrate the use of this application. The method runs in...
Considerable numbers of glass, ceramic and non-ceramic insulators strings are used on transmission and distribution overhead lines. Defects that commonly occur on this type of high voltage equipment are often associated with the presence of the corona discharges or gap discharges and therefore could be diagnosed using the electromagnetic signature of such phenomena. The paper investigates the correlation...
The objective of this study is to analyze the influence of electrochemical energy storage systems on low voltage grids with high penetration of renewables (RES), mostly photovoltaic power stations (PV). Furthermore, it compares the integration of energy storage systems (ESS) with other alternative solutions economically. It also presents the simulation results for a German power network in a suburban...
This paper aims to optimize the behavior of Plug-in Electric Vehicle (PEV) parking lots considering the interaction with renewable energy resources. In the proposed model, the PEV parking lot can participate in the day-ahead energy, spinning reserve and regulation markets. On this basis, behavior of the PEV parking lot in a distribution system is modeled consisting of wind and photovoltaic power producers...
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