ZIP coefficients load model
The ZIP coefficient load model, also known as the polynomial model,
represents the variation with voltage of a load composed of a
constant impedance part Z, a constant current part I and a constant
power part P.
The coefficients Zp, Ip and Pp are the ZIP coefficients for
active power and the coefficients Zq, Iq and Pq the ZIP
coefficients for reactive power.
By taking Zp = Ip = Zq = Iq = 0 and Pp = Pq = 1, one will have
a constant PQ load: P = PRefPu and Q = QRefPu.
By taking Zp = Pp = Zq = Pq = 0 and Ip = Iq = 1, one will get
a constant current load: P = PRefPu * (U/U0) and Q = QRefPu *
(U/U0).
By taking Ip = Pp = Iq = Pq = 0 and Zp = Zq = 1, one will end
up with a constant impedance load: P = PRefPu * (U/U0)² and Q =
QRefPu * (U/U0)²
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