  The curtailment of renewable energy is more frequently observed as the
renewable penetration levels are rising rapidly in modern power systems. It is
a waste of free and green renewable energy and implies current power grids are
unable to accommodate more renewable sources. One major reason is that higher
power transmission capacity is required for higher renewable penetration level.
Another major reason is the volatility of the renewable generation. The
hydrogen mix or pure hydrogen pipeline can both transfer and store the energy
in the form of hydrogen. However, its potential of accelerating renewable
integration has not been investigated. In this paper, hydrogen pipeline
networks, combined with power-to-hydrogen (P2H) and hydrogen-to-power (H2P)
facilities, are organized to form a Hydrogen Energy Transmission and Conversion
System (HETCS). We investigate the operation of power systems coupled with
HETCS, and propose the day-ahead security-constrained unit commitment (SCUC)
with HETCS. The SCUC simulation is conducted on a modified IEEE 24-bus power
system with HETCS. Simulation results show HETCS can substantially reduce the
renewable curtailment, CO2 emission, load payment and total operational cost.
This study validates the HETCS can be a promising solution to achieve net-zero
renewable grids.
