Combined heat and power (CHP) units exhibit inherent advantages in renewable energy integration. Under high renewable power variability, coupling electric–thermal conversion with CHP units enhances renewable energy accommodation. This study establishes a plant-level integrated energy system to achieve coordinated control under multi-scale renewable power disturbances. The proposed system integrates renewable energy generation via thermoelectric conversion devices, coupling deaerator feedwater and district heating networks. During positive renewable power fluctuations, surplus electricity is converted into thermal energy stored in feedwater and heating systems; during negative fluctuations, stored heat is released through condensate throttling and heating steam extraction throttling. Key innovations include first, enhanced dynamic modeling by quantifying superheated steam energy storage, upgrading turbine regulation parameters from static to dynamic to improve self-regulating capabilities; based on this, a novel robust adaptive control method integrating steam throttling and renewable-driven electrothermal conversion, ensuring stable electric/thermal outputs under multi-scale disturbances. Finally, experimental data from condensate throttling tests are utilized to calibrate dynamic parameters of superheated steam energy storage. Case studies demonstrate the system's regulation effectiveness across varying disturbance scales.
Shi et al. (Thu,) studied this question.