Efficient time domain power quality state estimation using the enhanced numerical differentiation Newton type method
An END-KF methodology is proposed for time domain power quality state estimation. Variant-invariant harmonics and transients are estimated with the END-KF method. State estimation completely determines the system state with partial measurements. END obtains the periodic steady state to be used as the initial condition for the KF. Power quality state estimation results are compared against the PSCAD/EMTDC response.
numerical differentiation transients harmonic analysis kalman filter limit cycle time-varying harmonics