GSR018/GC0077: Sub-synchronous oscillations
Decision
Publication date
GSR018 and GC0077 seek to modify the NETS SQSS and the Grid Code to include sub-synchronous oscillations (SSO) related provisions and clarify the associated accountabilities.
This includes the SSO modes that need to be considered, the definitions of acceptable and unacceptable SSO conditions and the operating conditions and secured events for which acceptable and unacceptable SSO conditions should be assessed.