Multilevel Inverters (MLIs) are becoming more and more popular in medium and high power applications. This is due to several inherent advantages of MLI over two-level inverters such as high-quality output, lower device ratings, and several others. While the classical topologies are still having applications in most of the key areas, there is a growing interest in newer multilevel topologies with an objective of reducing power semiconductor device count, gate drivers and/or isolated DC sources. In this paper, a comprehensive review of some of the recently proposed newer multilevel inverter topologies with the abovementioned objectives is presented. In this article, a detailed investigation in terms of total power semiconductor switch count, number of DC sources, passive component requirement, highest switch voltage rating, total standing voltage etc. has been presented.

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Wind energy conversion systems are the quickest developing renewable source of electrical energy having tremendous environmental and social advantages. In this paper proposed an optimal reactive power dispatch (ORPD) technique of wind power plants in grid connected power system. The ORPD issue is a vital issue in the operation of power frameworks. It is a nonlinear and mixed integer programming issue, which decides ideal qualities for control parameters of reactive power makers to upgrade particular target capacities while fulfilling a few specialized requirements. The ORPD technique consists of ACO and ANFIS controller for improving the performance of multiple wind turbines and the steady state stability of the power system in terms of active and reactive power flow of a transmission line. The ACO algorithm is used to extract the maximum power from WECS. The generated maximum power is transmitted through the UPFC connected HVDC link. The performance of the UPFC is improved with the ANFIS controller based on the actual and the reference power parameters of the grid connected power system. Furthermore, UPFC is utilized to control active and reactive flow of power in a transmission line. The proposed method is implemented in MATLAB/Simulink platform and tested with the different wind speed condition. To verify the effectiveness of the proposed model, the obtained results in the deterministic case is compared with the existing methods like GA and PSO.

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