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Large turbine generator units connected to series-compensated system may cause the sub-synchronous resonance (SSR) problem. It would result in the damages to the turbinegenerator shaft. To solve the problem, the controllable sub- and super-synchronous current is injected into generator stators. So the 10 kV, 10MVA cascade low-frequency high-power multilevel converter is designed to output the sub-...
The two-switch cascade converter is the most appropriate solution for efficient high-power applications among the existing converter topologies. However, the cascade structure and the nonlinear dc gain of boost circuit are more likely to cause severe oscillations if the criterion for the selection of the operation mode is chosen improperly during step-up/step-down transition. A novel high-power input-parallel...
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