Cross-System Fault Propagation Mechanism in Heat-Electrical Integrated Energy Systems: Insights From Pipe Leakage
Aobo Guan, Suyang Zhou, Wei Gu, Shuai Lu, Suhan Zhang, Dongming Gu
Abstract
Heat-electrical integrated energy systems (HE-IES) are gaining popularity due to their high energy efficiency. However, the stronger couplings between sub-energy system increase the risk of cascading faults, limiting the wider application of HE-IES. To address this issue, this paper investigates the fault propagation mechanism between the heating system and power system using a simulation-based method, specifically focusing on pipe leakage as an example, and provides insights for enhancing the resilience of HE-IES. Firstly, we introduce a detailed pipe leakage model that incorporates its influence on the hydraulic and thermal operating conditions. Then, we propose a fault-state HE-IES simulation framework, which adaptively adjusts the simulation strategy based on fault scenarios and is applicable to most common faults in HE-IES. Finally, we compare the influence of pipe leakage on strongly-coupled IES (SC-IES) and weakly-coupled IES (WC-IES) using a 22-node HE-IES testbed. Our simulation results reveal that, in SC-IES, the influence of pipe leakage can propagate in bi-directions among heating system and power system through combined heat and power (CHP) units. More detailed results emphasize that the operating condition of CHP is important in improving system fault tolerance.