In addition to Remote Terminal Units (RTUs), Real-Time Automation Controllers (RTACs) play a crucial role in modern SCADA systems, especially within power distribution and substation environments. RTACs are part of the control and monitoring equipment in substations. Let’s explore RTACs and their significance:
What Are RTACs?
- RTACs are industrially hardened devices designed for utility and industrial applications. They provide precise, deterministic processing, integrated cybersecurity features, and rugged hardware to ensure reliable performance even in harsh operating conditions1.
- These controllers serve as a bridge between various components within a power grid, enabling seamless communication, data processing, and control.
Key Features of RTACs:
- Protocol Conversion and SCADA Communications:
- RTACs act as data concentrators and protocol converters. They communicate with electrical metering and protection devices, ensuring interoperability across different protocols (such as DNP3, Modbus, IEC 60870-5-101/104, and more).
- By converting data between protocols, RTACs facilitate efficient communication between substations and the central SCADA system.
- Custom Logic and Real-Time Control:
- RTACs execute custom logic for various applications. They can send commands to control devices within the power plant, regulate output, and respond to events.
- Whether it’s load shedding, voltage regulation, or fault detection, RTACs provide real-time control capabilities.
- Event Reporting and Data Management:
- RTACs automatically collect event data from connected devices. Alarms, Sequence of Events (SOE) logs, and email notifications keep operators informed of any issues.
- The Data Management and Automation (DMA) suite ensures efficient event archiving and analysis.
- Human-Machine Interface (HMI):
- RTACs offer an optional web-based HMI for local and remote monitoring. Operators can visualize and control substation processes effectively using this interface2.
Applications of RTACs:
- Substation Automation:
- RTACs serve as substation gateways, handling protocol conversion, synchrophasors, time synchronization, and custom logic.
- They enhance communication between RTUs, protection relays, and SCADA systems.
- Power Plant Control (PPC):
- While RTACs have limitations as PPCs, they can still execute logic for power plant applications.
- From load management to optimizing power flow, RTACs contribute to efficient power generation.
- DER Integration and Grid Optimization:
- RTACs can control distributed energy resources (DERs) and optimize power flow at the point of common coupling.
- They play a role in maintaining grid stability and ensuring an uninterrupted power supply.
Conclusion
Real-Time Automation Controllers (RTACs) are the backbone of intelligent power systems. Their versatility, reliability, and ability to bridge communication gaps make them indispensable for SCADA applications in substations and beyond. As a technician, understanding RTACs empowers you to navigate the complex world of power distribution with confidence.