Technically, the Loop’s construction began in 1978. But it wasn’t called the Loop then. If you’re unfamiliar, the Loop is a 131-mile trail that spans Tucson, South Tucson, Oro Valley and Marana.

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Virtual synchronous generator (VSG) technology is able to provide inertial support to the grid, but at the same time becomes the emerging source of harmonic currents. To address this problem, this ...