Invention Grant
US08804381B2 Methods of balancing reactive power in multi-level motor drives with active front ends 有权
多级电机驱动与无功前端平衡无功功率的方法

Methods of balancing reactive power in multi-level motor drives with active front ends
Abstract:
A method of balancing reactive power at a power delivery system is disclosed. The method may include operating a power delivery system that may have a plurality of power cells that are electrically connected to a first transformer comprising one or more primary windings and a plurality of secondary windings such that each cell is electrically connected to one of the secondary windings and a plurality of the secondary windings are phase-shifted with respect to the primary windings. The method may further include controlling the reactive current flow at each power cell by calculating, at a first controller, a reactive current flow adjustment for at least one power cell so that reactive current flow is balanced among each of the plurality of power cells. Each cell may include a plurality of switching devices.
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