An Improved Voltage Sag Monitor Placement Method by Using Simple Probability Reach Area Matrix

A novel optimization model is introduced in this paper to achieve monitor placements of voltage sag. Considering the uncertainty of system parameters, calculation errors and measurement errors, the method of MRA is not suitable. The contradiction between the number of monitors and observation areas can be coordinated to achieve voltage sag observation with fewer monitor quantities. A new generalized approach defined as a simple probability reach area matrix (SPMRA) is proposed. SPMRA method is simulated by the IEEE-39 bus system, which reveals that monitor placement quantities can be reduced effectively under probabilistic observability. SPMRA method is a general method for monitor placements of voltage sag. This method not only performs the functions of conventional MRA methods, but also addresses the challenges of errors and conflicts between observation requirements and installation costs.