A Novel Approach for Renewable Power Integration by Using Nine IGBTs based UPFC Topology and Control

The reduction of the fossil fuel resources, the increased power demand and the increase in the environmental pollution has brought the world in a position to think seriously of different alternative sources of energy. Hence the sustainable energy sources are rapidly becoming significant around the world. However, the potential of the renewable sources is very high, the power generated by these energy sources is very low, and hence to meet the increasing power demand the integration of these resources is necessary. In the conventional UPFC topology two converters are implemented for injecting and absorbing reactive power in which each converter has six switches. So, totally twelve switches are being used in this topology. This leads to increased number of switches which increases the cost, switching losses and conduction losses. Practically the twelve switch converter requires more number of protection circuits. Hence to overcome these problems an integrated unified power flow controller (UPFC) with only nine switches has been proposed. The proposed work deals with an integrated UPFC with only nine IGBTs to improve the grid compliance of renewable (solar and wind) power integration system. There are two AC outputs in the integrated UPFC which are served as an AC injected voltage source and an AC current source, respectively.