6 Introduction
Manual Energy Storage Inverter ESI-S
ESS Main
controller
ESI
BMS
User system
(SCADA,…)
Battery
Figure 1- system overview
1.5 Definition of main functionalities related to energy storage
The use of these functionalities is described in
−
Islanding: the islanding mode is a network configuration where some loads and
generation devices are disconnected from the main grid and working
independently. In this configuration, the Energy Storage System (ESS) is acting
as the voltage reference for the complete island. In order to use this feature, a
UPS is required, information is given in
Chapter 6.
Loads:
- Three-phase
- Single-phase
Generation:
- Wind
turbines
- Solar panels
ESS
Supply
Island
Islanding
contactor
We distinguish two types of islanding:
•
Intentional: The BESS receives the order from the main controller/user to
disconnect itself (and the loads) from the grid. The system reconnects the
island to the grid when it receives the signal from the main controller.
•
Unintentional: the BESS detects that there is a voltage outage and stops.
−
Black-start (optional): this feature allows the ESS to start when the grid is not
present. In this case also an UPS is required.
−
Low Voltage Ride Through (LVRT):
It is required in case of LVRT to remain connected to the grid and to support if possible
the fault in order to clear it as fast as possible. In order to use this feature, a UPS is
