Dynamic exponential recovery load according to Karlsson & Hill [1]. with external input of P0 and Q0. The load powers are given by: der(xp) = P0*(V^(as) - V^at) - xp/Tp; Pl = (xp/Tp + P0*V^at); der(xq) = Q0*(V^(bs) - V^bt) - xq/Tq; Ql = (xq/Tq + Q0*V^bt); where xp is a continuous dynamic state that can be interpreted as a measure of the energy deficit in the load and Ps(V) = P0*V^as is the steady-state and Pt(V)=P0*V^at the transient voltage dependency. Pl is the actual active load power and Tp is the active power recovery time constant. For the reactive load power, a similar model is used with corresponding characteristics x_q, Qs(V)=Q0 V^bs, Qt(V) = Q0 V^bt and time constant Tq. --- [1] D. Karlsson and D.J. Hill, "Modelling and identification of nonlinear dynamic loads in power systems", IEEE Transactions on Power Systems, vol. 9, no. 1, pp. 157-163, February 1994.

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