For simulation purposes, loads are most often defined as the following types:
— Constant kVA load: such as running motors where a “constant kVA” characteristic means that the complex power S = P + jQ will be held constant.
— Constant impedance load: typically used for a motor which is starting, or for many static (non-motor) loads.
— Constant power and constant current loads: some load flow programs offer options for other forms of load modeling. For example, some kinds of static power conversion equipment might better be modeled as having constant real power and/or constant current characteristics.
— Generic load: used as general complex loads where the real and reactive powers (P and Q) are complex functions of terminal voltage and frequency.
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