PLL function in WECC generic model
In WECC generic models, PLL transients are ignored. The PSSE model REGCA1 includes wind turbine generator aspects associated with handling of variations in voltage angle. In this model converter control functions are represented using simplified features for regulation of both real and reactive current. REGCA1 model receives real and reactive current commands from the electrical control model (REECA1). The internal voltage source is then referred back within the network solution, where the terminal voltage is referenced to the swing bus in the load flow. The phase locked loop (PLL) function is used to synchronize the phase angle of the generator with the terminal voltage phase angle. As Figure 8-1 indicates, WECC renewable energy generator/converter model does not have detailed control functionality related to PLL and model assumes perfect synchronization of the phase angle of the generator with the terminal voltage phase angle. Therefore, WECC generic model does not capture the actual WTG response to the voltage angle changes. Any inputs on this ?
