Optimal generation rescheduling for meshed AC/HIS grids with multi-terminal voltage source converter high voltage direct current and battery energy storage system

Abstract

A network topology is required to solve the scheduling problems of power systems. These systems suffer from many problems such as limited generation resources, changing fuel prices, and inconsistent load demand. This paper proposes an optimal generation rescheduling method for a hybrid integrated system (HIS) that employ multi-terminal voltage source converter high voltage direct current (VSC-MTDC) systems and a battery energy storage system (BESS)-based voltage droop control with a power dead-band and voltage limits. The proposed process is based on the HIS station limits and charging/discharging cycles, and can be used to improve the HIS performance. An optimal power flow (OPF) problem is formulated by considering the grid code constraints within VSC-MTDC and BESS. Using Benders' decomposition, the proposed approach is formulated as a master problem and sub-problems, and is intended to enhance the overall operational efficiency by leveraging parallel processing. Moreover, the charging/discharging strategy employs an operational HIS algorithm over a 24 h demand profile. This strategy takes into account the actual demand conditions so that the optimal rescheduling algorithm can be implemented in a realistic manner. The results of simulations on a modified IEEE-39 bus system demonstrate and confirm the applicability, effectiveness, and suitability of the proposed approach. (C) 2016 Elsevier Ltd. All rights reserved.