Types of Load in Power system (ZIP)

This post describes the different load types and their relationship with voltage.

Types of load - ZIP

Power system loads are classified by one or a combination of the following types (To account for the voltage dependence).

Waveform of different types of ZIP load

General equation used in the ZIP load,

Where,
S-Power at voltage V, Si- Initial power at voltage Vi, when
k=0 (for constant power load; k=1(for constant current load); k=2(for constant
impedance load.
Expanding the above equation,

In the case of ZIP Load,

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