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The transition from centralized power grids to microgrids (MGs) has facilitated the increased integration of renewable energy sources (RES) to the power systems. However, the operational cost in MGs is highly dependent on planning decisions. Therefore, the optimal sizing and placement of RES will offer significant savings in operational costs and reduce power losses in the system. This study proposes a new technique for optimal sizing and placement of solar capacity in the electrical network to minimize the operational cost of conventional generators and real power losses. Due to the complexity and non-linearity associated with the problem, a new natural inspired optimization technique called lightning search algorithm (LSA) is developed to find the optimal solution. To assess LSA, differential evolution algorithm is also used to solve the same problem and a comparison is conducted to prove the superiority of LSA in reducing computation time. The optimization problem is applied to IEEE 14- and 30-bus systems with 24-hr load and solar profile. The obtained results verify the effectiveness of the proposed LSA approach to obtain the optimal sizing and placement of RES and reduce operational cost and power losses. [ABSTRACT FROM AUTHOR]

This article studies the use of robust UPFC-based stabilizers to damp low frequency oscillations. The potential of the UPFC-based stabilizers to enhance the dynamic stability is evaluated by singular value decomposition. Particle swarm optimization technique is used to optimize the parameters of each stabilizer, first individually, then concurrently. To ensure the robustness of the proposed stabilizers, the design process considers a wide range of operating conditions. The effectiveness of the proposed controllers is verified through several linear and nonlinear analysis techniques. These techniques prove that the coordinated design of UPFC-based stabilizers is superior over any of the individual designs. [ABSTRACT FROM AUTHOR]