Integrated Underfrequency Load Shedding Strategy for Islanded Microgrids Integrating Multiclass Load-Related Factors

作者：Can Wang, Bentao Cheng, Xuhui He, Lei Xi, Nan Yang, Zhuoli Zhao, Chun Sing Lai, Loi Lei Lai · 发表于：IEEE Transactions on Smart Grid · 年份：2025 · DOI：10.1109/tsg.2025.3586757 · 被引用次数：14 · 研究领域：Microgrid Control and Optimization、Islanding Detection in Power Systems、Power Systems and Renewable Energy

Reducing the decision response time of load shedding while considering the comprehensive value of load shedding is one of the main challenges faced in emergency control of islanded microgrids. However, the existing underfrequency load shedding strategies do not fully consider the multiple factors associated with the load, and load assessment and load shedding decision-making are separated; this results in a long response time for underfrequency load shedding decisions for islanded microgrids. Therefore, in this paper, an integrated underfrequency load shedding strategy for islanded microgrids is proposed, which integrates multiclass load-related factors. This strategy first constructs an integrated underfrequency load shedding model for islanded microgrids on the basis of multiclass load-related factors such as the load frequency regulation effect, load shedding cost, and three-phase system power unbalance degree. Then, the load shedding model is described as a Markov decision process (MDP), and the environment, action space, and reward function are defined considering the load shedding objectives and constraints of islanded microgrids. Finally, a novel twin delay deep deterministic policy gradient method with softmax and dual buffer replay (DBR-SD3) is developed to determine the optimal integrated underfrequency load shedding strategy. This approach integrates softmax and the dual buffer replay mechanism into twin delay deep deterministic policy gradient (TD3), which greatly...