Comparative Analysis of Systems Thyristor Voltage Converter — Asynchronous Motor With Serial and Parallel Adjustment

A comparative analysis of the influence of coordinate and parametric perturbations on the dynamic characteristics of the systems of subordinate (sequential adjustment) and modal (parallel adjustment) control in relation to the electric drive thyristor voltage converter — induction motor. For this purpose the uniform conditions of their functioning are provided. First of all, it is the synthesis of both systems according to the same standard (binomial) forms, as well as the effect of the same parametric and coordinate perturbations on the systems.

Synthesized two-circuit system of subordinate and modal control for electric drive thyristor voltage converter — asynchronous motor, based on the binomial standard form of root distribution of a characteristic polynomial. To implement the standard binomial form in the system of subordinate regulation, the method of the generalized characteristic polynomial of synthesis of the corresponding regulators is used. Simulation studies were performed under the influence of control effects and the presence of coordinate and parametric perturbations in both systems. In the role of coordinate perturbations the action of the moment of static loading is considered, and in the role of parametric perturbations — deviation of parameters of regulators and the moment of inertia from calculated values within ± 20 %.

Electromechanical systems using asynchronous motors have a feature that the motor torque during start-up cannot exceed the critical torque. Due to the fact that the synthesis of systems is carried out for a linearized model, where there is no torque limitation, the verification of dynamic processes in a real system with torque limitation under the condition of using synthesized regulators. It is established that for engine speed the standard binomial form is saved for settings for different speed. According to the results of simulation studies of the synthesized systems, it is established that the system of modal control has an advantage over the system of subordinate control with respect to the magnitude of static error under the action of parametric perturbations of regulators. For all other dynamic indicators, these two systems are the same.