ENERGY

摘要

In the December 2019 issue of IEEE Spectrum magazine, Scott Hinson of Pecan Street, a research firm in Austin, wrote about campuses that install on-site Distributed Energy Resources (DERs), with microgrids that generate solar power during the day to transfer some upstream to the local grid to reduce energy cost, and to store battery power as a standby in the event of a grid outage. However, multiple factors impact the efficiency of the power transfer. To start, the utility grid transmits a regulated Alternating Current (AC) with a sinusoidal waveform of 60 cycles per second, while the solar power generated by the microgrid is Direct Current (DC), which must be inverted to 60-cycle AC, in phase with the grid voltage, to transmit solar power to the grid.