Principle: Local Control
Local control entails that the local controller can read the asset frequency and power meter locally.
Recommended set-up
Controller, metering, and energy asset all connect over Modbus TCP.
Components: Control and Measurement
| Amount | Requirement | Availability | Network |
Local controller | One controller per LAN that has one or more Energy Assets to be controlled | Fever Local controller | Ordered through Fever | Requires LAN/WAN |
Frequency meter | For services in front of meter, one frequency meter is required for each locally controlled system. Note: frequency meter can also function as power meter. | See list of supported meters | Ordered through retailer | Connect to same LAN as controller or via RS485 to controller |
Power meter (Energy Asset) | For services front of meter, one power meter is required for each energy asset. Meter should only measure the effect to/from the Energy Asset | Accuracy: 0.5% or better. | Ordered through retailer | Connect to same LAN as controller or via RS485 to controller |
Power meter (Site Metering) | For services behind the meter, one meter is required measuring site consumption/production | Accuracy: 1% or better. See list of supported meters | Ordered through retailer | Connect to same LAN as controller or via RS485 to controller |
Current and voltage transformers | One per phase the meter is measuring | Accuracy: 0.5s or better | Ordered through retailer | n/a |
Components: Physical Placement
All equipment should be in weather sealed environment with low condensation. See data sheets for more information.
There are no proximity requirements of controller or frequency/effect reader as long as they are connected to the same LAN for each controlled energy asset.
Metering of energy assets: place CTs to capture the isolated effect from each energy asset, i.e. measure only the effect controlled by the Fever EMS.
Meter of site consumption/production. Please CTs to capture total site behind a grid connection point.
Network
Local Network
Each controller needs access to LAN and WAN (egress).
Each controller needs to access the Energy Asset and Metering over the same LAN.
As long as the controller can access WAN it established a secure and encrypted path out to the Fever cloud.
Dynamic IP
All controllers connected to local network needs an IP assigned from DHCP with DNS.
Static IP
All meters connected to local network needs a local static IP assigned to them.
Latency
Low latency requirements for LAN and WAN.
Wired WAN connection is preferred. 4G/5G connectivity works if signal strength is high and SIM-card isn’t capped or rate-limited.
Energy Asset connectivity: TCP
If Energy Asset does not support communication over TCP, the Fever EMS controller needs to be connected to the energy asset over another method (e.g. RS485). In this case, installation of controller is recommended in close proximity (within 20m) to energy asset. Note: EMS controller shill requires LAN/WAN network connection.
Glossary
CT: Current Transformer (Strömtransformator)
Energy Asset: an energy asset should be controlled as part of the EMS, ex: battery system or PV
DHCP: Dynamic IP allocation
EMS: Energy Management System
Recommended process
Site design is presented to Fever for confirmation on equipment and network completeness. Potential changes to preferred set-up are discussed are agreed.
Site network topology is presented by site network owner. Potential changes to preferred set-up are discussed and agreed.
For smoother installation process it is recommended that static IPs are decided before purchasing and installing the meters. This way meters can be delivered from retailers pre-configured. However, this is not a hard requirement if not possible.
Installer purchases required components and network equipment.
Installer installs equipment. Sends list and photos of installed controllers, meters and CTs to Fever.
Installer gives Fever two weeks heads-up before testing of control and metering.
Fever performs site installation validation.
Installation good practices
Place physical label on each controller and meter to signify what energy asset it is controlling or measuring.
Take not of the serial number and/or MAC-address of the readers and controllers for easy debugging. Take clear photo’s and send to fever for future reference.
When purchasing meters ensure that metering current input is compatible with CT secondary.
Take not of CT dimensioning on the primary and secondary side and ensure it matches the site amperage and reader specifications.
Before installing meters ensure they are correctly configured to the required reading and accuracy rate, and that firmware is updated to the latest available version, especially important for Frequency Readers.
For remote sites, remote triggered cycling of controllers and meters are preferred.
Make sure CTs are installed in the correct direction so that consumption and production in each phase gets the right signage when metered.
Caveat
This document serves as a base for discussion and should NOT be used as a definite guide. Each site is unique and should be treated as such.
Depending on what markets the site will be qualified for, additional information may be requested from Fever. Ex. information about frequency protection relays, LSFM controls and RfG testing/compliance.
Example site: Local Network covering all nodes
When the same local network covers the energy assets (PV and BESS) and transformer station, all controllers and meters can be installed in the transformer station. In this case, controllers can also be installed in proximity to the energy assets and separate from the metering.
