Abstract
As wind power generation undergoes rapid growth, lightning damages involving wind turbines have come to be regarded with more attention. Electric and magnetic fields generated by lightning represent a serious hazard to wind turbines. A new case study is presented with two interconnected wind turbines, considering that lightning strikes directly the blade of one wind turbine. Computer simulations obtained by using EMTP-RV are presented and conclusions are duly drawn.

Abstract
This paper focuses on the comprehensive modeling, simulation and experimental validation for a photovoltaic system formed by polycrystalline solar modules. The performance of the equivalent circuit model for a solar cell is validated by data measured parameters of photovoltaic modules. Also, this paper brings a novel iterative procedure to find the value of diode ideality factor, series and equivalent shunt resistances.

Abstract
This paper present a novel hybrid approach based on a combination of wavelet transform (WT), evolutionary particle swarm optimization (EPSO) and adaptive-network-based inference system (ANFIS), for short-term wind power forecasting in Portugal. The accuracy of the wind power forecasting attained with the proposed approach is evaluated, reporting its proficiency from a real-world case study in comparison with other methodologies. Conclusions are duly drawn.

Abstract
In this paper, a stochastic mixed-integer linear programming approach is proposed to find the optimal operations planning of a hydro producer acting as a risk-neutral price-maker trading in the day-ahead market based on a pool. The proposed approach optimizes a set of scenarios using as decision variables the amount of power supplied by each generation unit facing the 24-hours residual demand curves of each scenario. The supply competitive curves are built and the optimal bidding strategy is developed in the day-ahead market, in order to maximize the expected profit of the price-maker hydro producer. Results from a real-world case study are presented. Finally, conclusions are duly drawn.

Abstract
The current grid must be updated and controlled with automated systems that offer the intelligence of the smart grid. In this task the wireless networks for sensors and actuators are very important component of the future grid infrastructure, being the "nerve cells" of the entire system. The most important player in the smart grid is probably the consumer, that can use the electricity and at the same time can have its own generation to be feed into the grid. Hence, metering devices are essential components in the smart grid, monitoring the consumer's behavior and offering valuable information to the utilities and electric entities that will adapt the generation to match the consumption in a seamless way. The ZigBee standard is getting an increased adoption for the creation of cheap wireless networks that will connect the smart grid devices with each other. Still, there are little or no works that study the actual installation approaches, minimizing possible obstacles and decreasing costs. This paper present new field tests that study the integration and installation of ZigBee capable meters, offering at the same time several installation approaches.

Abstract
This paper is on offshore wind energy conversion systems with full-power converter and permanent magnet synchronous generator. The new drive train considered in this paper corresponds to a five-mass model and the resistant stiffness torque (structure and tower) in the deep water due to the moving surface elevation. Also, a multilevel converter and a fractional-order control strategy are considered. Simulation studies are carried out in order to adequately assess the harmonic content of the energy injected into the electric grid. Conclusions are duly drawn.