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Estimation of parameter errors from measurement residuals in state estimation [power systems]

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3 Author(s)
Liu, W.-H.E. ; Energy Manage. Syst. Div., Control Data Corp., Plymouth, MN, USA ; Wu, F.F. ; Shau-Ming Lun

Any error of network parameters affects the value of the measurement residuals calculated in state estimation. Explicit mathematical expressions relating the residuals to the parameter errors are derived. A two-step approach is proposed for parameter error estimation. The first step is to estimate a bias vector which combines the effects of parameter errors and the state of the system. A least-square approach using the measurement residuals calculated in each state estimation run is proposed for the first step. After several state estimation runs, a sequence of such bias vectors is obtained. The second step is to estimate the parameter errors from the sequence of bias vectors. A recursive least-square estimation method is proposed for this step. Theoretical and computational issues of the proposed method are addressed. Test results are presented

Published in:

Power Systems, IEEE Transactions on  (Volume:7 ,  Issue: 1 )