Efficiency and optimality in constrained variance control
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The constrained-variance control problem in which there are constraints on the magnitudes of each of the state variances is considered. This is a special case of a generalized constrained-cost problem. Assuming that a solution exists to the constrained-cost problem, multiobjective optimization theory is used to develop sufficient conditions for this problem to have an efficient (nondominated, Pareto-optimal) solution and for any efficient solution to solve an associated scalar optimization problem. It is then proved that these sufficient conditions are satisfied for the constrained-variance problem. Therefore, if a solution exists to the constrained-variance problem, then there exists a solution which also solves an optimal linear quadratic problem which weights only the state variances.