Supply-demand Schedule/Operation and Frequency Analysis using Generators and Battery Energy Storage System
In bulk power systems with large
photovoltaic (PV) power generation, the PV power output might be frequently
curtailed maintain the supply-demand balance. It can be reduced by employing energy
storage devices such as battery energy storage systems (BESSs) as well as
thermal generators.
It takes so long time to startup or shutdown large thermal generators. In
addition, BESSs may not be able to freely charge or discharge owing to the state
of charges (SoCs). Therefore, the generator unit commitment (UC) schedules and
BESS charging/discharging schedule must be determined in advance of
supply-demand operation. The scheduling problem is very complicated due to large
number of combinations of the generator activation as well as the BESS
charge/discharge.
We have developed scheduling and operation methods
through numerical simulations using high-speed computers (PCs). Furthermore, we
have designed a frequency analysis model considering economic load dispatching control
(EDC) as well as load frequency control (LFC) based on the supply-demand
schedules of generators and BESSs.
