Physical simulation study of dynamic voltage instability [in power systems]

This paper presents a physical simulation of the dynamic behaviour of voltage instability in an interconnected multimachine power system environment. The dynamic evolving process leading to eventual voltage collapse, the scenario of the progressive reactive support reduction resulting from the MXL protection relays, the OLTC operation, and the effect of switched-in capacitor banks are examined using physical facilities in the laboratory. The physical simulation results are also compared with digital simulation results. This physical investigation provides a reliable foundation for the effective development of assessment approaches and countermeasures.