Z = CPF_TANGENT(V, LAM, YBUS, SBUSB, SBUST, PV, PQ, ...
ZPRV, VPRV, LAMPRV, PARAMETERIZATION, DIRECTION)
Computes a normalized tangent predictor for the continuation power flow.
Inputs:
V : complex bus voltage vector at current solution
LAM : scalar lambda value at current solution
YBUS : complex bus admittance matrix
SBUSB : handle of function returning nb x 1 vector of complex
base case injections in p.u. and derivatives w.r.t. |V|
SBUST : handle of function returning nb x 1 vector of complex
target case injections in p.u. and derivatives w.r.t. |V|
PV : vector of indices of PV buses
PQ : vector of indices of PQ buses
ZPRV : normalized tangent prediction vector from previous step
VPRV : complex bus voltage vector at previous solution
LAMPRV : scalar lambda value at previous solution
PARAMETERIZATION : value of cpf.parameterization option.
DIRECTION: continuation direction (+1 for postive lambda
increase, -1 otherwise)
Outputs:
Z : the normalized tangent prediction vector