TY - GEN
T1 - Research on identifiability of equivalent motor in composite load model
AU - Ma, Jin
AU - Han, Dong
AU - He, Renmu
AU - Dong, Zhaoyang
AU - Hill, David J.
PY - 2007
Y1 - 2007
N2 - Load modeling is very important for power system dynamic analysis and control. The composite load model widely applied recently in the power system operation centre consists of the static load and the equivalent motor. Current practices in measurement-based load modeling identify all the parameters in this composite load model. However, it is not clear whether all these parameters could be identified from the measurements. This paper investigates the identifiability of the equivalent motor parameters in the composite load model. Trajectory sensitivity approach is applied first to find the motor parameters that have great effects on the measured active as well as reactive load dynamics. The analysis results show that the motor outputs have various sensitivities with respect to the parameters. Since the voltage disturbance, the active load and the reactive load dynamics are applied to identify the motor parameters, those parameters affecting the measurements to a great extent are observable, thus identifiable from the measurements; while those that have little effects on the motor outputs are unobservable from the measurements and consequently unidentifiable. The case studies verify the identifiability of the motor parameters.
AB - Load modeling is very important for power system dynamic analysis and control. The composite load model widely applied recently in the power system operation centre consists of the static load and the equivalent motor. Current practices in measurement-based load modeling identify all the parameters in this composite load model. However, it is not clear whether all these parameters could be identified from the measurements. This paper investigates the identifiability of the equivalent motor parameters in the composite load model. Trajectory sensitivity approach is applied first to find the motor parameters that have great effects on the measured active as well as reactive load dynamics. The analysis results show that the motor outputs have various sensitivities with respect to the parameters. Since the voltage disturbance, the active load and the reactive load dynamics are applied to identify the motor parameters, those parameters affecting the measurements to a great extent are observable, thus identifiable from the measurements; while those that have little effects on the motor outputs are unobservable from the measurements and consequently unidentifiable. The case studies verify the identifiability of the motor parameters.
KW - Measurement-based load modeling
KW - Power system stability
KW - Trajectory sensitivities
UR - http://www.scopus.com/inward/record.url?scp=50849106362&partnerID=8YFLogxK
U2 - 10.1109/PCT.2007.4538454
DO - 10.1109/PCT.2007.4538454
M3 - Conference contribution
SN - 9781424421909
T3 - 2007 IEEE Lausanne POWERTECH, Proceedings
SP - 1015
EP - 1020
BT - 2007 IEEE Lausanne POWERTECH, Proceedings
T2 - 2007 IEEE Lausanne POWERTECH
Y2 - 1 July 2007 through 5 July 2007
ER -