Asynchronous oscillation suppression method of separately controlled doubly fed electric machine and doubly fed electric machine system of asynchronous oscillation suppression method

Abstract

The embodiment of the invention discloses an asynchronous oscillation suppression method of an separately controlled doubly fed electric machine and a doubly fed electric machine system of the asynchronous oscillation suppression method. The method comprises the steps that active power of a rotor of the electric machine is calculated; an oscillating component of the active power is extracted from the active power; a slip frequency compensation quantity is calculated according to the oscillating component; slip frequency of the electric machine is compensated through the slip frequency compensation quantity. According to the asynchronous oscillation suppression method of the separately controlled doubly fed electric machine and the doubly fed electric machine system of the asynchronous oscillation suppression method, the slip frequency compensation quantity of the electric machine is calculated according to the oscillating component of the active power of the rotor and used for conducting compensation on the slip frequency, system damping is increased, stability of the system and rapidity of a response are improved, and the inherent unstable problems such as out-of-step which is prone to occurrence and overcurrent of a separately controlled doubly fed speed regulating system are solved.

Description

Technical field [0001] The invention relates to the technical field of motor control, in particular to a method for suppressing out-of-step oscillation of a separately controlled double-fed motor and its double-fed motor system. Background technique [0002] In the traditional speed control system of the wound rotor motor, most of the rotor series resistance speed control and the traditional cascade speed control system are adopted. The rotor string resistance speed control method is all wasted on the resistance due to the slip energy, and the system efficiency is low, and it has been gradually eliminated. This speed control method is almost no longer used in the new system, but it is still widely used. The old system of the speed regulation mode needs to be technically transformed and upgraded. The traditional wound rotor motor cascade speed regulation system realizes the subsynchronous speed regulation of the motor, but this system has the problem of inverter subversion, and t...

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Problems solved by technology

However, similar to the separately controlled control mode of permanent magnet synchronous motor without damping winding (starting winding), the separately controlled doubly-fed speed control system using voltage source inverter has inherent instability characteristics. , fast acceleration and deceleration, and other parameter mutations, it is a relatively complicated problem to maintain stability, prevent overcurrent and out-of-step oscillation, and the existence of this problem greatly limits the industrial application of this control system

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