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Operating Principle
PCS-9583 STATCOM system adopts voltage source converter and the most advanced reactive power compensation technology, not needing large-capacity capacitors and inductors. The H-bridge circuit is connected to the grid via connection transformer or reactor, by suitably adjusting the phase angle and amplitude of output voltage at AC side of the bridged circuit or directly controlling its AC current, this circuit can absorb or generate reactive current as required and realize dynamic adjustment of voltage or reactive power.
The cascading scheme of multi-level topology is used in the PCS- 9583 STATCOM system. This topology consists of several H-bridge power units with monopole multiplier modulation to achieve three-level output on the AC side. Each phase adopts the carrier phase modulation method to obtain better voltage output waveform with much more level numbers.The cascading scheme can output phase voltage with 2N +1 levels if each phase comprises N +1 links (i.e. the H-bridge power unit).
