Abstract
The coordinated heat-electricity dispatch of the urban integrated energy system (UIES) helps to improve the system flexibility, thereby overcoming the adverse effects caused by the random fluctuations of renewable energy (RE) and promoting the penetration of RE. Among them, the dynamic characteristics of the urban heat network (UHN) are important features that need to be considered for the operating scheduling of the UIES. This paper aims to establish a flexibility scheduling model for UIES based on the dynamic characteristics of the UHN. First, the typical structure and key equipment model of the urban integrated heat and power system (UIHPS) with the dynamic characteristics of the UHN is proposed. Then, the definition and model of the UIHPS flexibility and the assessment index of the flexibility are developed. Moreover, a flexibility scheduling model for a UIHPS that considers the dynamic characteristics of a UHN is established. Finally, the validity of the proposed model is validated by case studies, and the applicability of flexibility scheduling and the effect of heat load (HL) are analyzed.
Highlights
With problems such as energy shortages and environmental protection becoming increasingly prominent during the development of society, it is an inevitable decision to greatly develop renewable energy (RE)
Aiming at a urban integrated heat and power system (UIHPS) with a high percentage of RE, this paper establishes a flexibility scheduling model for a UIHPS considering the dynamic characteristics of the urban heating network (UHN) by combining the coupling characteristics of multi-energy system with the dynamic characteristics of a UHN
In the urban integrated energy system (UIES), due to the obvious transmission delay of the UHN, it must be considered in the flexibility scheduling model, otherwise the operational safety of the system may be broken
Summary
With problems such as energy shortages and environmental protection becoming increasingly prominent during the development of society, it is an inevitable decision to greatly develop renewable energy (RE). Existing research has made some achievements in improving power system flexibility through the integrated operation of electricity and heat, little attention has been paid to the influence of the dynamic characteristics of heating networks, such as transmission delay and temperature dynamics. For urban integrated energy systems (UIESs), the utilization of the above dynamic characteristics of UHNs through coupling components (e.g., CHPs) can better cope with fluctuations of RE (e.g., wind power) and significantly improve the system flexibility. UIES is a typical application form of IES [4,5], which refers to the unified design and operation of different energy vectors (e.g., electricity, heat, gas and hydrogen) within an urban area to achieve a safe, efficient and green supply for various energy demands.
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