Design of adaptive AC drive with adjustable dynamics
The problem of designing an adaptive speed-controlled AC electric drive with adjustable dynamics, built on the basis of a brushless motor with a thyristor converter, is posed and solved. At the same time, dynamics tuning is understood as the adjustment of the electric drive to the technical optimum with the desired transient response time. In practice, such adjustment is carried out using an adaptive controller with a reference model, the coefficients of which depend on only one parameter - the time of the transient response (setting time). The synthesis of the control law for such an adaptive controller was made as a result of setting and solving the problem of terminal adaptive control. By construction, the sought-for adaptive controller settings are the coefficients of the reference model and do not depend on the parameters of the synchronous machine on the basis of which the brushless motor is built. Synthesis and simulation procedures are implemented in the MATLAB & Simulink environment in the form of programs and S-models. The design results are presented in the form of graphs of transient characteristics of electric drives with traditional and adaptive control. It is shown that the AC adaptive electric drive has adjustable speed with constant overshoot, which corresponds to the technical optimum criterion. At the same time, there is practically no influence of cross magnetic fields of a synchronous machine on the dynamics of the electric drive.