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According to WLSE method for state estimation on nonlinear power system equation , the estimation of βxβ at β0thβ iteration is
Is not possible to derive
βX(0)est=H0TWH0-1Z-hX0
βX(0)est=H0TWH0-1H0TZ-hX0
βX(0)est=H0TWH0-1H0TWZ-hX0