Robust nonlinear control for a power system with multiple machines connected to the common bus terminal

In a power system controller design, we generally use one machine model to represent a power station. However, in a real power station, a more typical situation is that several generators are connected to a common same bus terminal, as shown in Figure 1. When these generators are all of the same parameters and work at the same operating conditions, we can simply make them equalized to one machine sending out the total amount of power generation of all those generators combined. However, in the general case, not all the generators are necessarily the same. Sometimes even relatively large differences exist in the operating conditions and parameters of those generators. Consequently, some problems are inevitably caused when we equalize those machines into one machine by any kind approximate techniques.