METHOD OF ESTIMATING THE PARAMETERS AND STATE OF POWER SYSTEM OF ELECTRIC VEHICLE
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Nov 17, 2016
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May 26, 2014
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Abstract
A method for estimating parameters and the state of a power system of an electric vehicle is disclosed. A multi-time scale model of the power system is set up; a parameter observer AEKFθ based on a macroscopic time scale and a state observer AEKF, based on a microcosmic time scale in the power system of the electric vehicle are initialized; time update is performed on the parameter observer AEKFθ, the updating time span is one macroscopic time scale, and a priori estimation value {circumflex over (θ)}−l at the moment t1,0, of the parameter θ is obtained; time update and measurement update are performed on the state observer AEKFx and circulated for L times, so that the time of the state observer AEKFx is updated to the moment t0,1; and measurement update is performed on the parameter observer AEKFθ, and the operation is circulated until the estimation is finished. By means of the method, the parameters and the state of the power system of the electric vehicle are estimated, the precision is high, the calculation time is short, and calculation costs are reduced.
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