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Open AccessArticle

Operation Optimization of Multi-District Integrated Energy System Considering Flexible Demand Response of Electric and Thermal Loads

1
School of Electrical Engineering, Southeast University, Nanjing 210096, Jiangsu, China
2
State Grid Jiangsu Electric Power Co., Ltd., Maintenance Branch Company, Nanjing 211102, Jiangsu, China
*
Author to whom correspondence should be addressed.
Energies 2019, 12(20), 3831; https://doi.org/10.3390/en12203831
Received: 13 September 2019 / Revised: 28 September 2019 / Accepted: 4 October 2019 / Published: 10 October 2019
(This article belongs to the Section Smart Grids and Microgrids)
Multi-district integrated energy system (IES) can make full use of the complementary characteristics of district power and thermal system, and loads in different districts. It can improve the flexibility and economy of system operation, which has a good development prospect. Firstly, based on the general energy transfer model of the district heating network (DHN), the DHN system is described by the basic equations of the heating network and nodes considering the characteristics of the transmission time delay and heat loss in pipelines. A coupling model of DHN and multi-district IES is established. Secondly, the flexible demand response (FDR) model of electric and thermal loads is established. The load characteristics of each district in IES are studied. A shiftable load model based on the electric quantity balance is constructed. Considering the flexibility of the heat demand, a thermal load adjustment model based on the comfort constraint is constructed to make the thermal load elastic and controllable in time and space. Finally, a mixed integer linear programming (MILP) model for operation optimization of multi-district IES with the DHN considering the FDR of electric and thermal loads is established based on the supply and demand sides. The result shows that the proposed model makes full use of the complementary characteristics of electric and thermal loads in different districts. It realizes the coordinated distribution of thermal energy among different districts and improves the efficiency of thermal energy utilization through the DHN. FDR effectively reduces the peak-valley difference of loads. It further reduces the total operating cost by the coordinated operation of the DHN and multi-district IES. View Full-Text
Keywords: multi-district integrated energy system; complementary characteristics; district heating network; flexible demand response; operation optimization; mixed integer linear programming multi-district integrated energy system; complementary characteristics; district heating network; flexible demand response; operation optimization; mixed integer linear programming
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Zhou, C.; Zheng, J.; Liu, S.; Liu, Y.; Mei, F.; Pan, Y.; Shi, T.; Wu, J. Operation Optimization of Multi-District Integrated Energy System Considering Flexible Demand Response of Electric and Thermal Loads. Energies 2019, 12, 3831.

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