This component models the load characteristics as a function of voltage magnitude and frequency, where the load real and reactive power our considered separately using the well known expressions:
And,
Where,
|
Equivalent load real power |
|
Rated real power per phase |
|
Load voltage |
|
Rated load voltage (RMS, L-G) |
|
dP/dV Voltage index for real power |
|
dP/dF Frequency index for real power |
|
Equivalent load reactive power |
|
Rated reactive power (+inductive) per phase |
|
dQ/dV Voltage index for reactive power |
|
dQ/dF Frequency index for reactive power |
NOTE: dQ, dP, dV and dF are in all per-unit quantities
Every half cycle (at the appropriate voltage zero), the shunt resistor is updated to reflect the non-linear load effect as a function of RMS voltage and frequency. Similarly, the shunt inductor or capacitor, in parallel to the load resistor, is updated every half cycle (at its voltage zero) to reflect its non-linear characteristic.
IMPORTANT NOTE: The initial values of R, L and C are computed based on the rated conditions supplied by the user. These values are kept constant until 10 cycles of the fundamental frequency has passed.
More: |
Fixed Load (1 and 3-Phase, LG) See Reference [3] for more details on static load models and typical values for NP, NQ, KPF and KQF. |
