IEC 61850 modeling of an AGC dispatching scheme for mitigation of short-term power flow variations

Abstract

High penetration of renewable energy-based generators increases variability in power systems. To prevent transmission lines from overloading due to such variations, advanced power flow management system should be developed. This paper proposes an Automatic Generation Control (AGC) design that mitigates power flow increase on heavy load lines. The developed method optimizes dispatching of control order from AGC so as not to increase power flow of these lines. This is achieved by considering how the output change of each control unit effects power flow in the system. The performance of the proposed method is examined by simulation study with 10-machine power system model. Furthermore, the communication infrastructure of the developed AGC system and its components are developed according to IEC 61850 communication standard. Operational instructions are mapped onto IEC 61850 messages. Simulations are performed with network emulators to validate the developed communication models and their operation. The benefit of the proposed communication system with IEC 61850 is achieving plug and play capability with universal models. The results of both simulations show that communication infrastructure is successfully developed and AGC prevents power flow increase in heavily loaded lines by making use of remained capacity of light loaded lines as proposed.

Keywords

• Power system communication
• Smart grid
• IEC 61850
• MMS message
• IEC 62351-4
• Automatic Generation Control (AGC)