1167 / 2019-07-15 22:54:07

Optimal Placement of STATCOMs in Multi-infeed Power Electronic Systems for Small Signal Stability

small signal stability, STATCOM, optimal placement, power electronic device (PED).

The power electronic devices (PEDs) have small signal stability issues in weak grids. As high-controllability devices, the STATCOMs can be a potential choice to enhance the small-signal stability. However, how the location of STATCOMs influences the stability of a multi-infeed power electronic system (MIPES) has not been investigated. To quantify the STATCOMs’ location on the small signal stability for a structure-preserving MIPES, an eigenvalue-sensitivity-based method is proposed in this paper. The theoretical analysis shows that for a homogeneous MIPES, the STATCOMs’ location on the stability mainly depends on the network structure, PEDs’ capacities and STATCOMs’ location. Based on this, a metric is proposed for the optimal placement of STATCOMs in a MIPES to enhance the small signal stability. Simulation results verify the validity of this metric.