Redispatch is the process used by grid operators to manage grid congestion. It involves an external command to adjust power output. For Redispatch 2.0, you need two distinct interfaces: one for live physical control (hardware) and one for data planning (software/platform).

1. The Physical Interface (Real-Time Control)

This is the "box" located at your facility. It translates the grid operator's signals into commands for your EZA controller (Power Generation Unit controller). While the hardware and configuration vary by grid operator, they almost universally utilize the same communication protocol (IEC 104).

• The Hardware:
  
  • Installations > 100 kW: You typically require a Telecontrol Unit (Fernwirkgerät). This is more advanced than the older ripple control receivers (Rundsteuerempfänger).
  • Future Standard: Increasingly, this is being handled by a Smart Meter Gateway (iMSys) paired with a control box (Steuerbox). However, for many commercial projects, the classic telecontrol unit remains the standard.
• The Protocol:
  
  • IEC 60870-5-104 (IEC 104): This is the standard language for communication over TCP/IP.
  • The Process: The grid operator sends a "Setpoint" (e.g., "reduce output to 60%") via this protocol. Your system must respond with "Real-time values" (e.g., "current output is 60 kW").
• The Connection:
  
  • This is usually established via a secure VPN connection or a dedicated mobile router (4G/LTE) using a SIM card, which is often provided or specified by the grid operator.