MODAL REGULATORS OF A DIRECT CURRENT ELECTRIC DRIVE WITH A PULSE-WIDTH CONVERTER

Abstract

The technique of modal regulators synthesis of instantaneous coordinates values of direct current digital electric drives with a pulse-width converter by a state space method taking into account the influence of variable pure delay in the control channel is presented.

Full Text

The theory of digital repeated systems of the subordinated regulation of the electric drive [1–3] is developed well enough. Less attention has been paid to electric drive systems constructed on the basis of summation of feedbacks on a state vector that allows to expect the decrease of sensitivity to variations of control object parameters. In domestic literature such regulators are usually called modal because factors of a feedback vector directly influence eigenvalues (modes) of the closed system matrix. In the present paper the task of designing of such regulators is set. The task includes: – reception of discrete equations of a control object condition according to its differential equations; – definition of feedback factors by state variables according to the set spectrum of a matrix of the closed digital control system dynamics; – introducing the corrective amendments connected with some features of the real pulse-width converter (PWC). It is supposed that the influence of variable pure delay in the control channel of a double digital system which is rather typical for an electric drive system with microprocessor control is taken into account.