Frequency Nadir Constrained Unit Commitment for High Renewable Penetration Island Power Systems

IF 3.3 Q3 ENERGY & FUELS IEEE Open Access Journal of Power and Energy Pub Date : 2024-02-26 DOI:10.1109/OAJPE.2024.3370504
Xuebo Liu;Xin Fang;Ningchao Gao;Haoyu Yuan;Andy Hoke;Hongyu Wu;Jin Tan
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Abstract

The process of energy decarbonization in island power systems is accelerated due to the swift integration of inverter-based renewable energy resources (IBRs). The unique features of such systems, including rapid frequency changes resulting from potential generation outages or imbalances due to the unpredictability of renewable power, pose a significant challenge in maintaining the frequency nadir without external support. This paper presents a unit commitment (UC) model with data-driven frequency nadir constraints, including either frequency nadir or minimum inertia requirements, helping to limit frequency deviations after significant generator outages. The constraints are formulated using a linear regression model that takes advantage of real-world, year-long generation scheduling and dynamic simulation data. The efficacy of the proposed UC model is verified through a year-long simulation in an actual island power system using historical weather data. The alternative minimum inertia constraint, derived from actual system operation assumptions, is also evaluated. Findings demonstrate that the proposed frequency nadir constraint notably improves the system’s frequency nadir under high photovoltaic (PV) penetration levels, albeit with a slight increase in generation costs, when compared to the alternative minimum inertia constraint.
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高可再生渗透率岛屿电力系统的频率下限约束机组承诺
由于基于逆变器的可再生能源资源(IBRs)的迅速整合,岛屿电力系统的能源去碳化进程正在加速。此类系统的独特性,包括可再生能源电力的不可预测性导致的潜在发电中断或不平衡造成的频率快速变化,给在没有外部支持的情况下维持频率中点带来了巨大挑战。本文提出了一种机组承诺(UC)模型,该模型具有数据驱动的频率底限约束,包括频率底限或最小惯性要求,有助于限制重大发电机停机后的频率偏差。这些约束条件是通过线性回归模型制定的,该模型利用了真实世界的全年发电调度和动态模拟数据。利用历史天气数据在实际岛屿电力系统中进行了长达一年的模拟,验证了所提出的 UC 模型的有效性。此外,还对根据实际系统运行假设得出的替代性最小惯性约束进行了评估。研究结果表明,与替代的最小惯性约束相比,尽管发电成本略有增加,但在光伏发电(PV)渗透率较高的情况下,拟议的频率下限约束明显改善了系统的频率下限。
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CiteScore
7.80
自引率
5.30%
发文量
45
审稿时长
10 weeks
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