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Transient Stability improvement using series reactors: A case study

A solution is presented that improves the transient stability of a remotely connected 5640 MVA power station that is to be built 10km from an existing 4428 MVA power station through the use of fixed mH size air-core reactors. The main component of the solution involves dividing each 6-pack power station into two 3-pack stations by the use of series busbar reactors and also linking the two neighbouring power stations through a series reactor. The paper explains the impact these reactors have on synchronizing power flows and shows that optimal values for these reactors exist that maximize transient stability. The complete Transient Stability Scheme (TSS) has little negative impact on transmission and generation plant and increases the Critical Clearing Time (CCT) from 43ms to 88ms.