H - Electricity – 03 – K
Patent
H - Electricity
03
K
H03K 17/94 (2006.01) H02J 3/18 (2006.01)
Patent
CA 2242368
A switching control arrangement for a multilevel convertor minimises the harmonic content of the convertor 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 behaviour 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.
Areva T&d Uk Ltd.
Fetherstonhaugh & Co.
Gec Alsthom Limited
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