The voltage stability of large scale renewable energy grid-connected system plays a major role in a power system environment. Nowadays, Integration of large scale wind power may have severe impacts on the power system operation. Stable, reliable and economic operation of the power system under the massive integration of wind power is a big challenge to power system operators. This paper seeks to study the voltage stability problems for the integration of wind power and Photovoltaic (PV) to the IEEE-14 bus network. Modern analytical tools are demonstrated to study voltage stability analysis by using PV analysis and dynamic analysis. Comparative study is developed to present the behavior of voltage stability of the system that employs PV and different types of wind farms. These analyses define the amount of reactive power required to enhance voltage stability. Simulation of 14-IEEE network with integrated renewable energy sources is developed using PSS/E.

Under Frequency Load Shedding, UFLS, is the last step and the most extreme in protecting electric power systems from black outs and severe damages. Adaptive UFLS methods using df/dt are unreliable. SCADA is too slow to achieve a proper protection of the power system under severe over load condition. This paper presents an adaptive under frequency load shedding using Phasor Measurement Unit ,PMU, AUFLS, method depends on power measurement using the advantage of high speed wide area protection system. The simulation results demonstrate a considerable advantage to improve power system stability.

Concentrated Photovoltaic modules (CPV) use optics, such as lenses to concentrate a large amount of sunlight onto a small area of solar photovoltaic materials to generate electricity. The solar irradiance level and landscape area are considered as main factors in CPV site on the network. These factors are not sufficient for improving the CPV performance and grid integration .The coupling point of CPV to the grid is an important role and affects the network stability. This paper focuses on the influence study of CPV location on voltage stability .PSS/E has been used as a tool for simulation and validation the integration of CPV to 14-IEEE network as benchmark test. Ac contingency analysis tool is used to study the voltage stability at different cases and locations of CPV. Results indicate that the distributed CPV improves the voltage stability of the network, rather than centralized CPV. Distributed CPV connects at different locations and near to the load. Therefore, the impact of distributed CPV is minimized with respect to voltage stability issue.

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