Improving operational flexibility of combined heat and power system through numerous thermal controllable residents aggregation. (September 2021)

• Record Type: Journal Article
• Authors: Yi, Zhongkai; Xu, Yinliang; Wu, Chenyu
• Is Part Of: International journal of electrical power & energy systems. Volume 130(2021)
• Publication Date: 2021-09
• Subjects: Combined heat and power -- Wind power -- Thermal controllable residents -- Economic dispatch -- Aggregation and disaggregation; Electrical engineering -- Periodicals; Electric power systems -- Periodicals; Électrotechnique -- Périodiques; Réseaux électriques (Énergie) -- Périodiques; Electric power systems; Electrical engineering; Periodicals; 621.3
• DOI: 10.1016/j.ijepes.2021.106841
• Languages: English
• ISSNs: 0142-0615

Abstract

Highlights: An economic dispatch framework for combined heat and power systems is proposed. A polytope-based aggregation and disaggregation method is developed. The aggregation model includes feasible region and equivalent cost parameters. The proposed approach can manage numerous thermal controllable residents. Uncertainty is modeled by the distributionally robust chance-constrained program. Abstract: Thermal controllable residents possess great potential of thermal inertia to improve the system renewable generation accommodation capability. Nevertheless, a high-dimensional optimization problem with huge computational burden emerges if a large number of small thermal controllable residents are modeled individually. In light of this, a polytope-based inner approximate aggregation approach for thermal controllable residents with heterogeneous parameters is proposed, which can unlock the potential operational flexibility offered by numerous small thermal controllable residents and satisfy their various operational constraints. Moreover, a day-ahead economic dispatch framework for combined heat and power systems coordinating with thermal controllable residents' aggregation and disaggregation processes is proposed to further utilize the thermal controllable residents' flexibility and promote the wind energy accommodation. The object is to reduce the overall operation cost while ensuring users' comfort and diversified system operational constraints. Simulation analyses are conducted on the 14-bus electric system and 7-node district heating system, which substantiate that the proposed approach can efficiently improve the system economy and relieve the wind power curtailment through aggregate management of numerous thermal controllable residents.