Abstract:
With the integration of renewable energy and various demand response strategies into the distribution network, the voltage security of the distribution network will face unprecedented challenges, resulting in the problems such as bi-directional power flow, voltage limit violations, etc. This paper explores the operating flexibility of distribution network and energy storage devices, and proposes a network reconfiguration method combing with energy storage management to limit the voltage volatility index (VVI). At the same time, to reduce the lifetime degradation caused by frequent charging and discharging, this paper defines the life level set of energy storage based on the hyperspace projection of lifetime surface to represent the health operating area (HOA). Then, this paper proposes the convex approximation for the defined life level set to replace the nonlinear energy storage lifetime constraint, which can solve the reconstruction problem efficiently. Finally, the IEEE-33 node system is selected as an example system to analyze and verify the effectiveness and practicability of the proposed method.