Working mode one: peak shaving
During the peak output period of the photovoltaic power plant, the
application goal is to control the charging of the battery energy storage system
with peak shaving. After the peak output period of the photovoltaic power plant
and during the daytime output period of the photovoltaic power plant, the power
of the battery energy storage system is controlled to amplify and discharge to
the lower limit of the SOE working range of the battery energy storage system.
Then, the energy storage system stops working to ensure that the working time of
the energy storage system is within the power generation time of the
photovoltaic power plant, without increasing the working time of the
photovoltaic power plant, reducing the impact of configuring the energy storage
system on the work arrangement of the photovoltaic power plant.
Working mode 2: Peak shaving+smoothing
During the peak output period of photovoltaic power stations, the
application goal is to control the charging of battery energy storage systems
with peak shaving. The output fluctuations of large-scale photovoltaic power
plants can be divided into two types. One type is the slow change in output of
photovoltaic power plants, such as the periodic change in output caused by day
and night alternation; Another type is the sudden change in output of
photovoltaic power plants, such as a sudden decrease in output caused by
floating clouds. The first round of change has a large amplitude, but the change
is slow; The second type of change has unpredictability and suddenness, and in
severe cases, the output decreases from full power to below 30% of the rated
value within 1-2 seconds. After the peak period of photovoltaic power output,
the goal is to control the discharge of the energy storage system by controlling
the fluctuation of the output of the photovoltaic power station during the
smooth day night alternation process. The discharge reaches the lower limit of
the operating range of the battery energy storage system SOE. If it has entered
nighttime and the output of the photovoltaic power station drops to 0, the SOE
of the energy storage system is still greater than 0.2. Control the energy
storage system to discharge at the rated power constant power until the SOE
reaches 0.2, and then control the energy storage system to stop working.
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