Power system state estimation with equality constraints

ABSTRACT In this paper, a new technique for constrained power system state estimation is presented. The new technique is based on a recently developed least absolute value (LAV) state estimation procedure. Unlike least squares state estimation, least absolute value state estimation is well suited to constrained estimation problems. Most power systems contain zero injection buses at which there is no load or generation. These buses impose constraints on a state estimator, since the real and reactive power injected at these buses is fixed at zero. The least absolute value state estimator, which is presented in this paper, will initially treat all constaints as measurements. This increases the redundancy ratio of the measurement set without adding any additional metering costs. After a preliminary (least squares) estimate is calculated, all of the constraints are placed in the interpolated measurement set. The interpolated measurement set is then completed with the addition of some of the actual measurements...