In a network open access environment, various electricity transactions with different contract paths will occur, and which tend to result in parallel flows. In order to reduce such kinds of power flows, series types of FACTS devices suchasTCSC can be used. On the other hand, since the FACTS devices are effective means for stability enhancement, those devices will be utilized for the both purposes of power flow control and stabilizing control in the network open access environment.
This paper proposes a new concept of Transaction Path Filter (TPF) which can screen and order the electricity transactions from the viewpoint of parallel flow reduction and stabilizing ability of TCSC. In the TPF, first, the amount of compensation of TCSC is computed which is necessary for completely reducing the parallel flow of each transaction. Next, by using sensitivity analysis of eigenvalue, the effect of the compensation on stabilizing ability of TCSC is evaluated as the change in the real parts of eigenvalues corresponding to the focused oscillatory modes. Each transaction is classified into four ranks based on the necessary amount of compensation and the stabilizing ability, and then it is determined whether the transaction is accepted or not by system operators.