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Innovative PID-GA MPPT Controller for Extraction of Maximum Power From Variable Wind Turbine DOI:10.15199/48.2019.08.26

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The growing demand of energy and the successive oil shocks since the 70s have demonstrated the economic and geopolitical risks of energy production based on the exploitation of fossil fuels, whose reserves are unevenly distributed and exhaustible. Renewable energy is the energy comes from natural resources such solar energy, wind, rain, tides, geothermal heat and various forms of biomass .These resources are renewable and can be naturally replenished continuously [1-3]. Therefore, development of new forms of energy sources must take a huge consideration as solution in order to cover the future demands and the huge disturbances. Wind energy source is regarded as one of the most important renewable energy source; it can be used today in many applications [4]. Due to previous, many countries have made great progress in wind power technology such as Denmark which produces 40% of its electricity from wind, and at least 83 other countries around the world are using wind power to supply their electricity grids. The global wind power capacity expanded 16% to 369,553 MW. As shown in fig.1.Although several advantages of wind turbine, its random nature of wind and nonlinear characteristic (Power-speed) are the main drawbacks. Therefore, the wind turbine system must be designed to operate at their maximum power for different conditions. So over the last few decades, considerable progress has been made in the MPPT techniques and consequently many Maximum Power Point Tracking (MPPT) methods have been developed [6-10 ]. Fig.1. Global wind power cumulative capacity [5] The doubly feed induction generator is widely used in variable speed wind turbine systems owing to their ability to maximize wind power extraction and to their capability to fulfill the basic technical requirements set by the system operators and contribute to power system security [11-12]. Usually, a DFIG wind turbine is shown in Figure 2. Fig.2. Wind Turbine System A lo[...]

Parallel Fuzzy Logic and PI Controller for Transient Stability and Voltage Regulation of Power System Including Wind Turbine DOI:10.15199/48.2019.09.10

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Today, power system instability problem is taking up an important role in the study of planning and control, because instability may produce adverse effects on the robust structure of system. In especial, power oscillations with frequency between 0.2 and 2.0 Hz, i.e., Local and inter-area oscillations may risk the operation and cause the system instability. As an ending, the wide area blackout may occur [1, 2]. To solve this issue, a suitable damping controller is needed in order to call down for overall system stability. Because, without proper without proper damping, the oscillations will not decay, lead into system instability. Power System Stabilizer (PSS) is employed to supply an auxiliary control signal to an excitation system on synchronous generators to enhance the stability by damping the oscillations and extending the limit of power transfer, thus maintaining reliable operation of the system. However, due to the nonlinearity of the power system configurations and frequent changes in the operating conditions, the performance of the PSS was highly affected [3, 4]. At present days, Conventional generating units combined several renewable generating units to respond to meet the need for electric power to the consumers. The synchronous generators which that experience these devices installed is out of service to allow the system to accommodate the new wind power generation, their damping contribution is obviously lost [5]. In the last few years there has been a growing interest in SVC PID controllers in order to have the great possible performance [6, 7]. However, the structure of the electric power system is large and the design is in a complex state, and it’s very difficult to find a linearized model of the system. In summary, it's laborious to apply an online controller because the electric power systems are time varying, so a fixed controller is more feasible and desirable. In the last few years, several Met[...]

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