An Improved Multi-Timescale Coordinated Control Strategy for Stand-Alone Microgrid with Hybrid Energy Storage System

Abstract

Abstract:A scientific and effective coordinated control strategy is crucial to the safe and economic operation of a microgrid (MG). With the continuous improvement of the renewable energy source (RES) penetration rate in MG, the randomness and intermittency of its output lead to the increasing regulation pressure of the conventional controllable units, the increase of the operating risk of MG and the difficulty in improving the operational economy. To solve the mentioned problems and take advantage of hybrid energy storage system (HESS), this study proposes a multi-time scale coordinated control scheme of "day-ahead optimization (DAO) + intraday rolling (IDR) + quasi-real-time correction (QRTC) + real-time coordinated control (RTCC)." Considering the shortcomings of existing low prediction accuracy of distributed RES and loads, the soft constraints such as unit commitment scheduling errors and load switching scheduling errors are introduced in the intraday rolling model, allowing the correction of day-ahead unit commitment and load switching schedule. In the quasi-real-time coordinated control, an integrated criterion is introduced to decide the adjustment priority of the distributed generations. In the real-time coordinated control, the HESS adopts an improved first order low pass filtering algorithm to adaptively compensate the second-level unbalanced power. Compared with the traditional coordinated control strategy, the proposed improved model has the advantages of good robustness and fast solving speed and provides some guidance for the intelligent solution for stable and economic operation of stand-alone MG with HESS.

Stand-Alone Microgrid with 100% Renewable Energy: A Case Study with Hybrid Solar PV-Battery-Hydrogen

“…In recent years, many research studies on P2H2P systems have dealt with the energy management systems, controller functions, technical challenges of RESS components, and economic analysis. Studies such as Giorgio Caua et al 2014 [19], L. Valverde et al 2016 [20], Mauricio Higuita Cano 2017 [21] and Yanfeng Liu et al 2018 [11] examined the optimal scheduling of the RESS components to maximize the benefit of the RE and minimize the investment cost. These research studies have concluded that an energy management strategy is essential for the optimal utilisation of the P2H2P systems as well as the optimization of the RESS.…”

“…Renewable energy storage systems (RESS) play a crucial role in maximizing the RER contribution to the SAM energy balance. Such RESS solutions can be a hybrid combination of more than one technology working together in a synergistic way [7,21]. However, the classic trend is to use a conventional diesel generator (DG) as a backup or to meet the peak load in combination with RESS for the optimal energy system component sizing to minimize capital cost [16,17,[21][22][23][24].From the available researches, it is evident that SAM with a high percentage of RE penetration and hybrid RESS can be reliable, cost-effective and more sustainable compared to a 100% fossil-fuel-based SAM [25].…”

“…Such RESS solutions can be a hybrid combination of more than one technology working together in a synergistic way [7,21]. However, the classic trend is to use a conventional diesel generator (DG) as a backup or to meet the peak load in combination with RESS for the optimal energy system component sizing to minimize capital cost [16,17,[21][22][23][24].From the available researches, it is evident that SAM with a high percentage of RE penetration and hybrid RESS can be reliable, cost-effective and more sustainable compared to a 100% fossil-fuel-based SAM [25]. Many countries around the world such as Australia, Bangladesh, India and South Africa are currently doing in-depth research to deploy microgrid-based energy-efficient and reliable power systems for rural or island communities [26][27][28].…”

“…Such RESS solutions can be a hybrid combination of more than one technology working together in a synergistic way [7,21]. However, the classic trend is to use a conventional diesel generator (DG) as a backup or to meet the peak load in combination with RESS for the optimal energy system component sizing to minimize capital cost [16,17,[21][22][23][24].…”

Techno-Economic Analysis of the Hybrid Solar PV/H/Fuel Cell Based Supply Scheme for Green Mobile Communication

“…Significant work has been done on the power to hydrogen to the power system (P2H2P) by concentrating on the technical obstacles to pick adaptive energy storage systems such as charge/discharge time, size, cost, safety & management, and life cycle problems [17,31]. In order to optimize the RE's utility and to reduce investment costs, reference [32][33][34] evaluated the best schedule of RESS components. These investigations have revealed that an energy management strategy is important for the efficient use and optimization of P2H2P systems.…”