This document defines the minimum communication and performance requirements for integrating a Battery Energy Storage System (BESS) into the EcoData Park Controller.
The purpose of this questionnaire is to determine whether the battery system can be controlled fast and accurately enough for active power management, reactive power control and grid support applications according to VDE-AR-N 4105 and VDE-AR-N 4110.
The following measured values and control values must be available via Modbus TCP, Modbus RTU or another documented communication interface.
The available charging and discharging power registers shall represent the actual currently available power.
These values must reflect limitations caused by:
Example: A 1 MW battery system may only be able to charge with 200 kW because the battery is almost full. In this case the available charging power register shall report 200 kW and not the nominal 1 MW.
The reactive power setpoint must support one of the following input formats:
% of nominal reactive power var kVar
Not acceptable:
Reactive power control via cos φ or power factor setpoint only is not sufficient and cannot be used for integration.
If the reactive power setpoint is specified as a percentage, an additional register providing the nominal reactive power is required.
The battery system shall follow externally provided active power and reactive power setpoints directly.
The battery inverter, PCS, EMS and BMS shall not apply additional ramp limits, smoothing functions, filtering functions, averaging functions or delayed execution mechanisms that modify the requested setpoint.
The EcoData Park Controller generates all required ramps and gradients. The battery system shall therefore execute the received setpoints as requested.
Does the system apply any internal ramp limitation, power smoothing, slew-rate limitation, filtering or averaging function to active or reactive power setpoints?
No Yes
The EcoData Park Controller typically updates setpoints every 500 ms.
The response time is defined as the time between receipt of a new active power setpoint and achievement of the requested active power level.
Maximum acceptable response time VDE4105: ≤ 500 ms
Maximum acceptable response time VDE4110: ≤ 200 ms
Manufacturer specified response time: ms
Integration can only be performed if a real test system is available.
A technical contact person from the battery system manufacturer must be available during the integration process and must be familiar with the communication interface, register map and controller configuration of the battery system.
The manufacturer is responsible for providing complete and correct documentation of all registers, scaling factors, units and communication parameters required for integration.
