Energy storage system is a key component of SmartGrid. SmartGrid – is the future of united electric energy system. It is based on production control and electricity supply network complex development, as well as the possibility of storing the energy by optimizing electric network operation.
Energy storage system creates energy stock during incomplete energy system load with its subsequent emission into the system within the moments of peak consumption. ESS also reduces the dependence of generating capacities from consumption inequality and improves the quality of produced energy for the final customer.
Energy storage system’s structure component is ESS – storage system based on lithium-ion batteries with integrated power part – DC/AC transformers, automatic equipment and relay protection elements.
The advantages of energy storage systems:
The enlargement of network discharge capacity;
The increase of energy system’s reliability;
Possibility of frequency regulation and electric energy quality improvement;
The expansion of available capacity at load decrease on electricity supply network equipment and infrastructure modernization expenditures;
Generating equipment capacity unleash in the regions with energy deficit;
Decrease of operative and running expenditures of generating and network equipment;
The possibility of work at two-part tariff: energy accumulation during its low cost period, and its distribution during its high cost period;
Electric energy reservation for exceptionally important consumers and their support during power supply failures;
Integration with RESOP generating equipment ( substitution of fuel component of DPP).
Basic working modes of ESS:
Energy accumulation mode
ESS produces LIA charge from energy source, in this case consumable capacity is limited by set value.
Energy distribution mode
ESS distributes the accumulated energy into the network/to consumer. In this case ESS voltage by frequency, phase and instant value synchronizes with network voltage, while ESS output current is limited within its technical characteristics bounds.
ESS does not consume or distribute electric energy into the network (expect energy consumption for auxiliaries).
ESS swtiches to consumer power mode without energy distribution into the network.