Lithium power stations have advantages of flexible resource allocation, fast response, and independence from weather and geographical location. It has great potential in promoting the integration of renewable resources and improving the flexibility of ESS operation. For systems with a high penetration rate of non-dispatchable intermittent power generation resources, large-scale grid-side energy storage power stations can effectively suppress frequency fluctuations and voltage fluctuations. Container batteries have the function of shaving peaks and filling valleys, and have received great attention in many countries.
At present, the large-capacity lithium battery power station generally adopts the outdoor container-type battery compartment layout scheme. As an energy storage unit, the battery compartment consist of a lithium battery pack, energy storage converter PCS, converter transformer, BMS, etc. The lithium battery pack in the battery compartment is composed of a certain number of single lithium batteries connected in series and parallel according to the rated voltage and rated capacity of the battery pack, and then boosted to the specified voltage through a complete set of PCS and converter transformers.
The total capacity of the entire energy storage power station consists of multiple battery compartments in parallel. The operating status of each battery compartment is monitored by its internal BMS, and the relevant operating status data is uploaded to the data acquisition (SCADA) and energy management system (EMS) of the main station. The upper-level power grid dispatch center can communicate with the SCADA and EMS of the main station through real-time Ethernet and 100M Ethernet to monitor the overall operation status of the energy storage power station and control the PCS operation.
