Congestion management in HOPS using advanced real time calculations

To smoothly integrate Renewable Energy Sources (RES) into the transmission power system, the Croatian Transmission System Operator (HOPS) must address potential congestions in the power system promptly, in the day ahead and intraday planning phase as well as in the real-time operation. Therefore, implementing a real-time congestion management system is essential to facilitate easier power system operation management for operators with target to keep the reliability of the power system high. This paper aims to provide a detailed description of the principles of operation and methods for using the redispatch security constrained dispatch function, which is part of the new SCADA/EMS system in the HOPS National Control Center which is used in both real-time and study time calculations. The operational principles and functionality of this redispatch function will be illustrated with concrete example of transmission line congestion in the Croatian transmission power system, highlighting real limitations in its application usage.