Optimized Dispatching Method for Flexibility Improvement of AC-MTDC Distribution Systems Considering Aggregated Electric Vehicles

Abstract

With the increasing use of renewable resources and electric vehicles (EVs), the variability and uncertainty in their nature put forward a high requirement for flexibility in AC distribution system incorporating voltage source converter (VSC) based multi-terminal direct current (MTDC) grids. In order to improve the capability of distribution systems to cope with uncertainty, the flexibility enhancement of AC-MTDC distribution systems considering aggregated EVs is studied. Firstly, the charging and discharging model of one EV is proposed considering the users' demand difference and traveling needs. Based on this, a vehicle-to-grid (V2G) control strategy for aggregated EVs to participate in the flexibility promotion of distribution systems is provided. After that, an optimal flexible dispatching method is proposed to improve the flexibility of power systems through cooperation of VSCs, controllable distributed generations (CDGs), aggregated EVs, and energy storage systems (ES-Ss). Finally, a case study of an AC-MTDC distribution system is carried out. Simulation results show that the proposed dispatching method is capable of effectively enhancing the system flexibility, reducing renewable power curtailment, decreasing load abandonment, and cutting down system cost.

Stackelberg Game-based Coordinative Dispatch of EV Charging Stations and Urban Distribution Systems Considering Temporal-spatial Dynamic Traffic Flow

“…In [2], a scheme to optimize the integration of the EVCS with the radial distribution system (RDS) through the utilization of static reactive power compensator (STATCOM) and distributed generation (DG) is explored. [3] proposes a V2G (Vehicle to grid) control strategy oriented towards the flexibility enhancement of aggregated EVs participating in the distribution system. In response to this, an optimal flexible dispatch method is introduced to enhance the power system's adaptability via the collaborative integration of adjustable voltage regulators, manageable distributed generation, collective electric vehicles, and energy storage systems.…”

Flexibility evaluation of a new distribution system based on cooperative game-Gaussian cloud model

“…The current research on power system flexibility evaluation mainly focuses on the construction of flexibility evaluation indexes and proposes different flexibility evaluation indexes based on different perspectives [9][10]. Literature [11] proposed technical uncertainty flexibility index and techno-economic uncertainty flexibility index based on the consideration of technical and economic factors.…”