The new "direct self-control" (DSC) is a simple method of signal processing which gives converter-fed three-phase machines an excellent dynamic performance. To control the torque of, e.g., an induction motor, it is sufficient to process the measured signals of the stator currents and the total flux linkages only. Optimal performance of drive systems is accomplsihed in steady state as well as under transient conditions by combination of several two-limits controls. The expenses are less than in the case of proposed predictive control systems or flux acceleration method (FAM), if the converter's switching frequency has to be kept minimal.

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A generally applicable method t o analyse the relations connecting currents, voltages. instantaneous-, active-, nonactiveand apparent power quantities is described. By introducing a special m-conductor equivalent scheme an unified treatment of nonsinusoidal, unbalanced polyphase systems is possible and a simple definition of unsymmetrical loads can be derived. I t is explained why i t is necessary t o distinguish between the . decomposition of quantities into components or into portions. The method includes other ones well known and approved in the past as more special cases.

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