EMO-L Load Management

The Load Management maintains the voltage and frequency reference source in its optimal operational power rate. EMO-L Load Management provides priority based load shedding and load restoration functions based on the criticality of loads. The priority of the loads is determined based on their type or importance and according to customer’s needs and can be modified by the Microgrid operator.

Load Management (coded) including the following main functions:

Load Shedding - Disconnection of loads.
- Visual notifications of circuit breakers (CB) opening commands.
Load Restoration - Reconnection of loads.
- Visual notifications of CB closing commands.

Load Shedding

During operations, electrical power system might encounter disturbances leading to an unbalanced situation in the network when the load demand becomes greater than the power generation. Under such circumstances, the available power supply may not be able to support the plant’s actual load, and remaining DERs might get overloaded or limited. Such situations initiate damages on the electrical assets and lead to a total collapse of the electrical system and thus a total disruption of the grid.

Load shedding of EMO-L is a real-time automation function which helps to shed non-critical loads when the electricity production or consumption becomes inadequate or out of balance with respect to one another. Production sources tripping, critical bus tripping and frequency drift are events which can initiate a load shedding situation.

Loads are shed according to their priority and is provided during system configuration and can be modified by the energy manager.

NOTE: Low priority loads are shed first.

The aim is to keep the continuity of service on critical loads to ensure DERs don’t get overloaded and to help prevent a complete system blackout.

When very fast time response of shedding action is required, EMO-L can be combined with iFLS, which is a complementary application running on a separate controller.

Load Restoration

The load restoration function reconnects load feeders after a load shedding scheme occurred, once shed condition has been cleared and required power has been restored. Loads are restored according to their priority, reversely to the priorities set for the load shedding function.

The load restoration function is performed manually by the operator from the local HMI or SCADA.

NOTE: Loads with higher priority are restored first.