Automatic load restoration in power system
Perumal, N1, Chan, Chee Ying2.
This paper describes an automatic load restoration method implemented following automatic load shedding. Load restoration is usually initiated manually at the discretion of the authorities. Load restoration after load shedding can only be executed after the system has recovered completely and its normal frequency is restored. Loads should be restored in small blocks sequenced by time delay between successive restorations to allow frequency stabilization. Simulations were performed using the ERACS Power System Software. Important design considerations for this scheme were the maximum anticipated overload, number of load shedding steps, size of load shed at each step and frequency relay settings. A case study was carried out at PETRONAS Penapisan Melaka, whereby a load shedding and load restoration scheme was designed for its upcoming cogeneration plant. Simulations performed indicated that the load shedding and load recovery design is feasible and able to halt frequency collapse due to generation loss, and enables loads to be restored automatically in stages after the system has recovered. The design strategy, calculations and justification are presented in this paper.
Affiliation:
- Universiti Teknologi PETRONAS, Malaysia
- Universiti Teknologi PETRONAS, Malaysia