1. Battery system
At present, energy storage methods are mainly divided into three
categories: physical energy storage (pumped storage, compressed air storage,
flywheel storage, etc.), chemical energy storage (lead-acid batteries, redox
flow batteries, sodium sulfur batteries, lithium-ion batteries), and
electromagnetic energy storage. Due to economic and application scenarios,
chemical energy storage is the most widely used in addition to pumped storage.
From the international and domestic markets, the application of lithium-ion in
chemical energy storage is more common.
2. PCS inverter system
The energy storage bidirectional converter, abbreviated as PCS, can achieve
AC/DC conversion between the battery and the power grid, complete bidirectional
energy flow between the two, and achieve charge and discharge management of the
battery system, grid load power tracking, battery energy storage system charge
and discharge power control, and control grid measurement voltage under normal
and islanded operation modes through control strategies; It has the
characteristics of high conversion efficiency, wide voltage input range, fast
and off grid switching, and convenient maintenance. At the same time, it has
complete protection functions, such as island protection, DC overvoltage
protection, and low voltage ride through (optional), to meet the requirements of
system integration and off grid.
3. Box transformer system (if any)
If a high-voltage (6kV, 10kV, 20kV, 35kV, etc.) grid connected system is
used, a box transformer must be used to complete the boosting task. To minimize
electromagnetic interference and circulating current effects between the two
branches, a double split transformer is used in the box transformer system, and
other parameters are not significantly different from those of wind power and
photovoltaic.
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