Multi-Time-Scale Rolling Optimal Dispatch for Grid-Connected AC/DC Hybrid Microgrids

Abstract

In order to reduce the impact of the randomness and volatility of renewable energy on the economic operation of AC/DC hybrid microgrids, a multi-time-scale rolling optimization strategy is proposed for the grid-connected AC/DC hybrid microgrids. It considers the source-load uncertainty declined with time scale reduction, and the scheduling cooperation problem of different units on different time scales. In this paper, we propose a three-time-scale optimal strategy of the day-ahead, intraday and real-time dispatching stage and a two-level rolling optimal strategy of the intraday and real-time stage, aiming at minimizing the operating cost. We added the power penalty cost in the rolling optimization model to limit the energy state of the energy storage system in the constraint, and improve the power correction and tracking effect of the rolling optimization. A typical-structure AC/DC hybrid microgrid is analyzed in this paper and the simulation results are shown to demonstrate the feasibility and effectiveness of the proposed multi-time-scale rolling optimal dispatch.

Blockchain-Based Decentralized Power Dispatching Model for Power Grids Integrated with Renewable Energy and Flexible Load

“…At the same time, the demand for power trading and consumption by each electric power company is increasingly prominent. The selection of suitable power trading methods to meet the requirements of economic efficiency targets under current technical conditions has become a topic of discussion among scholars [10][11][12][13][14]. A novel approach to discovering an optimal multi-area dynamic economic dispatch solution integrated with wind power and pumped hydroelectric storage was proposed in [10].…”

Modeling, Control, and Optimization of Multi-Generation and Hybrid Energy Systems

“…Luo et al developed a multi-timescale rolling optimal dispatch methodology, which they applied to grid-connected AC/DC hybrid microgrids. In their paper, they propose a threetimescale system that helps to coordinate grid operations with day-ahead, intraday, and real-time dispatching stages [18]. While hybrid power generation systems are connected electrically at the grid level, the grid interfaces with end uses of energy.…”

Robust Cascade MRAC for a Hybrid Grid-Connected Renewable Energy System

“…The use of hybrid grid-connected renewable energy systems has risen over the last years to respond to an increasing electrical energy demand more sustainably. It injects electrical power generated by renewable energy sources and could avoid the expense of electric batteries as storage devices [1,2].…”

“…Several technical aspects improved this technology advancement, such as power electronics [3,4], economic issues [5,6], dispatching management [2,7], and control strategies [1,8]. This paper focuses on improving the control strategy for a class of power system.…”