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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.Dynawo.Electrical.Loads.LoadZIP