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Fig. 6. Line Flow Sensitivity Factor for 33-bus Indian network
After placing TCSC in line-2, it has been found from optimization algorithm that for optimal setting of TCSC control parameter at 0.00419 pu, the congestion from the system is managed effectively. For this setting of TCSC, the power flow results are shown in Table 5 which illustrates that the power flow in line-18, which was earlier congested, is within its limit. The performance of the proposed algorithm is also analyzed by placing TCSC to other potential locations i.e. line-3 and line-6. It has been found that for control parameter setting of TCSC at 0.00250 pu and 0.00347 pu respectively for these two locations of TCSC placement, the congestion is effectively alleviated from the system which can also be observed from power flow results shown in Table 5. The percentage line loading for the considered potential locations of TCSC is illustrated in Fig. 7 which shows that placement of TCSC at these locations alleviates the system congestion.
The cost-benefit analysis for these potential locations of TCSC placement has been performed and the results are given in Table 6 from which it can be observed that placement of TCSC in line-2 gives its minimum installation cost as well as minimum generation cost of the system.
Table 5 Power flow in congested line of 33-bus Indian network for different locations of TCSC