| Abstract |
One of the most important characteristics of a good state observer for any type of plant, must be to reflect the plant performance, both in the transient and in the steady-state response. First in this paper, we present the AC induction motor equivalent circuit, called TI, which one has the linear TORQUE-SPEED characteristics. Also we study the transient performance of the conventional state observers doing several simulations to show their very poor transient response. We develop a new rotating vectorial theory, to describe any type of transient or steady state conditions, which is applicable to any AC system with the field orientation theory. We present a new type of state observer (called Is-state observer) which describes very accurately the AC motor dynamics, comparing in several simulations its characteristics with the conventional ones. We present a full, control-Is state observer set, which gives a very accurate solution in steady-state as well as in transient conditions. Finally we present a complete simulation set to give a real feeling about the high quality of the new Is-state observer here proposed. |
