Switching control arrangement

Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components

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363 40, 363 98, H02M 112

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active

06088245&

ABSTRACT:
A switching control arrangement for a multilevel convertor minimizes the harmonic content of the converter voltage or current by an open-loop and/or a closed-loop control of the timing of the switching of the GTOs associated with the energy-storage components (e.g. capacitors) in the convertor. In a first open-loop arrangement the convertor current is quantized over its working range and different threshold values are provided in dependence on the quantization values of the current. In a second open-loop arrangement a continuous, non-quantized control is provided based on at least a quadratic approximation to the desired current-dependent behavior of the GTO switching angles. In a third, closed-loop arrangement, different GTO-switching threshold levels are provided as controlled by a Fourier integration process involving the nulling of those harmonics desired to be nulled. The control arrangement is applicable to chain or stacked-capacitor multilevel convertors and can be employed in SVC applications or applications in which the convertor draws real power as well as reactive power.

REFERENCES:
patent: 4599685 (1986-07-01), Hombu et al.
patent: 4775924 (1988-10-01), Sweezy
patent: 4800478 (1989-01-01), Takahashi
patent: 5343139 (1994-08-01), Gyugyi et al.
patent: 5532575 (1996-07-01), Ainsworth et al.
patent: 5751138 (1998-05-01), Venkata et al.

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