Dynamic load dispatch for power system robust security against uncertainties

Abstract

The rapid growth in the electricity demand and expansion of renewable energy (RE) generation are presenting serious challenges for the optimal network operation. The future perspective of the dramatic increase in renewable generation, such as wind and solar energy will lead to severe problems related to the load dispatch. Power system security is threatened due to increase in the uncertainties of RE outputs and the reduction of controllable resources. This paper investigates power system “robust security” in relation with the increase in the uncertainties and the decrease in system control ability. A new concept of robust security and its security regions is defined and then a new technique for real-time dynamic ELD is proposed. It is guaranteed secure operation in the security region and mitigating the irregularity associated with renewable power generation. Key issue is an effective treatment of uncertainties caused by RE forecast and an efficient solution for real-time management over the limited control resources of a power system. The flexible operational outcome of the proposed approach satisfies the economical requirements and reliability against uncertainties. The proposed method is also useful to investigate the limitation of RE under given ability of real-time generation control. Critical problems anticipated in the future are further investigated from the point of view of robust security concerned with the load dispatch. Robust security for West Japan system is also investigated from the present up to 2030 concerned with the transient stability.