Mitigating Oscillations in the Victorian Transmission Network: A Structured Remediation Approach

The effective management and mitigation of power system oscillations is essential for maintaining power system security. However, Inverter Based Resource (IBR) controllers, particularly in weak/radially connected parts of the network (with low system strength), can become unstable resulting in voltage oscillations known as ‘sub-synchronous controller interactions’ (SSCI) that are typically between 5-25 Hz. In the last several years, it has been observed that the increasing penetration of IBR generation and displacement of synchronous generators in the Australian National Electricity Market (NEM) system has resulted in a wider range of/more frequent poorly damped sub-synchronous oscillations at higher sub-synchronous frequencies. In particular, oscillations in the Victoria (VIC) network…