After an Idaho teacher refused to take down a motivational poster, the state banned some signs from being displayed in public ...

Vintage political art posters show how protesters have long used July 4th to demand civil rights, social change and economic ...

The negative- and zero-sequence currents of a modular multilevel converter (MMC) under imbalanced ac-grid conditions increase the maximum voltage of the submodule (SM) capacitors, which should be kept ...

Cascaded H-bridge converters based islanded microgrids are applied to integrate the distributed generators (DGs). The accurate load sharing is an important task for the research of microgrids. Due to ...