Enhancement of ATC of Transmission Line using Demand Response Programme for Congestion Management

The Demand Response Program(DRP) is considered as an effective congestion management method for improving the ATC value. This paper describes the impact of DRP on Available Transfer Capacity (ATC) of power system for congestion management. In the first stage, market is cleared based on generation cost minimization without considering network constraints and with these generation, congested lines are determined. In the second stage, the ATC value before and after implementation of DRP is determined using sensitivity based AC Power Transfer Distribution Factor(ACPTDF) approach. The critical lines are identified based on zero ATC value for different hours and it indicates that no power is transferred through these lines. The DRP shifts the non essential demand from peak hours to off-peak and valley periods and hence ATC value during peak period is increased. The simulation result demonstrates that the implementation of DRP enhance the ATC value of critical lines and also relieve the congestion. The proposed approach is analysed using AC Optimal Power Flow (ACOPF) on IEEE 39 bus system and is modeled in GAMS environment. In order to have practical situation, the variation in load for 24 hrs is considered.