Dual-Stage Optimization Scheduling Model for a Grid-Connected Renewable Energy System with Hybrid Energy Storage

Abstract

To operate the grid-connected renewable energy system economically, this study presents a dual-stage optimization scheduling model for grid-connected systems with hybrid energy storage, including day-ahead and intra-days stages. In the day-ahead stage, an economically optimal scheduling model is developed, considering the price peak-to-valley difference. This model aims to enhance the economic efficiency of the system by utilizing hybrid energy storage. In the intra-day stage, more accurate renewable energy forecasts with a shorter time scale are considered. The objectives are to minimize the curtailment rate of renewable energy and to track the day-ahead scheduling outcomes. The NSGA-II algorithm is employed for multi-objective optimization, achieving equilibrium solutions considering multiple optimization objectives. Compared to other published works, the proposed model achieves a balance between different optimization objectives, enabling the system to operate economically and stably. It provides a comprehensive approach to optimize the scheduling of grid-connected systems with hybrid energy storage by considering both economic and operational aspects. Overall, this proposed dual-stage optimization model presents a viable approach to improve economic efficiency and mitigate renewable energy curtailment in grid-connected systems. By effectively integrating renewable energy sources and optimizing their utilization, this model contributes to enhancing the sustainability and optimal operation of the power grid.

Thermodynamic Comparison of the Steam Ejectors Integrated at Different Locations in Cogeneration Systems

“…In this study, EBSILON professional (version 16.02, Iqony Solutions GmbH, Essen, Germany) is selected as the model platform, as it is widely used in energy system simulations and has been proven to be precise in many studies [35]. The following assumptions are adopted: (1) The operational mode of the boiler (steam generator) is a modified sliding pressure operation according to the design book. (2) The condenser pressure, temperature differences of RHs, pump efficiencies, and pressure loss ratios of the pipes remain unchanged in the off-design conditions.…”

“…Low-carbon energy systems are crucial for global energy transition to address the climate and energy crisis [1]. According to an International Energy Agency (IEA) report, coal remains the primary energy source for global energy systems [2,3].…”