modelBaseUFLS
Base model for under-frequency load shedding relays
Parameters
| Type | Name | Default | Description |
|---|
| Integer | NbSteps | | Number of steps in the UFLS scheme |
| Types.Time | tFilter | 0.01 | Time constant of the load change filter in s |
| Types.Time | tLagAction | | Time-lag due to the actual tripping action in s |
| Types.AngularVelocityPu | omegaThresholdPu | | Frequency threshold of the UFLS scheme in pu (base omegaNom) (for each step of the UFLS scheme) |
| Real | UFLSStep | | Share of load disconnected by a step of UFLS (sum of all steps should be at most 1) (for each step of the UFLS scheme) |
Components
| Type | Name | Default | Description |
|---|
| Types.AngularVelocityPu | omegaMonitoredPu | | Monitored frequency in pu (base omegaNom) |
| Real | deltaPQ | | Delta to apply on PRef and QRef in % due to UFLS disconnections, to connect to the variables deltaP and deltaQ in the load model |
| Real | deltaPQfiltered | | Smoothed out version of deltaPQ for better numerical stability |
| Types.Time | tThresholdReached | | Time when reaches the ith UFLS threshold (for each step of the UFLS scheme) |
| Real | loadReduction | | Share of load disconnected by a step of UFLS (for each step of the UFLS scheme) |
| Boolean | stepActivated | | true if the ith step of UFLS has been activated (for each step of the UFLS scheme) |