EMO-L Software Modules

EMO Topology Engine

Topology engine module is a dedicated internal component that dynamically analyzes electrical and power balance information in real time and publishes the results on the network using IEC 61850 and/or Modbus protocol.

Electrical network topological changes occur frequently in Microgrids structures, mainly due to the transition to islanded mode of operation and due to the intermittency of the power supply from the renewable energy sources. EMO-L Microgrid controller uses real-time information from the topological engine to determine and perform required control actions when pre-defined configured situations or parameters are met.

The following parameters are monitored by the EMO Topology Engine:

• Topology of Microgrid electrical network: Topological engine constantly computes the electrical network topology and islanding parameters, retrieves, and reports the state of the electrical network and its components (circuits breakers, busbars, and so on) in real time.

• Power production per island: Computes the energy production per island, the power delivered, rated nominal power and power capacity, voltage, and frequency in real time. The computation is performed for each group of available DER types.

EMO Automation

EMO Automation is the main component of EMO-L. It controls and manages the different islands of the installation, the DER operation and maintains network stability considering external criteria such as operator constraints.

EMO Automation module is based on ISaGRAF IEC 61131 and it allows adaptation of the algorithms as per requirements within its programming capabilities.

Messaging Protocol

EMO-L messaging protocol module is a bidirectional messaging interface (kernel) in charge of the acquisition and transmission of messages or data using various protocols.

The following communication protocols are supported by EMO-L messaging protocol module:

Lower layer interfaces

• MODBUS TCP: EMO-L messaging protocol module communicates in MODBUS TCP with DER and loads in the scope of Linux EcoStruxure Power Operation System (EPAS) gateway.

  It receives and publishes status data, measurements, setpoint values and control commands. It sends MODBUS TCP communication status on MODBUS network.

• IEC 61850:

  EMO-L messaging protocol module communicates in IEC 61850 in the scope of Linux EPAS. It receives and publishes status data, measurements, setpoint values and control commands.

  It sends IEC 61850 communication status on IEC 61850 network.

• DER interfaces

  EMO-L interacts with a set of different field equipment to perform control and management functions. Field equipment are from different suppliers.

  The following table summarizes expected DER interfaces and communication protocols:

  Interface	Modbus	IEC 61850
  Diesel generator controller	✔	✔
  PV system	✔	✔
  BESS	✔	✔
  IED	✔	✔

  NOTE: The feasibility of protocol implementation will be evaluated based on project needs and constraints, however this list is provided as a general overview.

Upper layer interfaces

EMO-L can communicate with an upper layer management system using multiple interfaces in parallel with bidirectional communication.

EMO-L messaging protocol module interfaces and communicates with EMA using MODBUS TCP. It receives and publishes status data, measurements, setpoint values and control commands.

The following table summarizes the connections and protocols managed with upper layer management elements:

Distributed Network Protocol (DNP3): DNP3 is a set of communication protocols used between components in process automation systems. Its main use is in utilities such as electric and water companies.

EMO Static Data - Settings Engine

EMO-L settings engine provides real time dynamic access for PMS algorithms settings and allows the Microgrid operator or commissioning engineer via local HMI to modify Microgrid controller settings to fine-tune system configuration to suit the size and other current needs of the project.