Economic dispatch and flexibility enhancement of multi-energy microgrid considering cross-seasonal heat balance of ground source heat pump

To meet the demand for energy diversity, the degree of coupling between cooling, heating, and electricity becomes more and more complex. The participation of multi-energy coupling components in economic dispatch, such as combined heat and power unit (CHP), thermal energy storage (TES), and ground source heat pump (GSHP), has become a research focus for scholars. It is worth noting that inappropriate control of GSHP can lead to an imbalance in soil heat, which in turn can change the soil temperature and affect the COP of the operation of GSHP in the coming year. However, the current research on GSHP is still limited to short-term dispatch, ignoring the influence of cross-seasonal heat balance on the coefficient of performance (COP) and lifespan of GSHP. Therefore, this paper first performs precise modeling for CHP and TES, in which we will introduce an operational region for CHP and analyze the heat loss of TES. Secondly, we analyze the working principle of the GSHP and illustrate the influence of cross-seasonal heat balance on the COP of GSHP and the necessity of its scheduling over a long period. Thirdly, we innovatively propose an economic dispatch model of a multi-energy microgrid considering cross-seasonal heat balance. Finally, numerical tests are given to verify the effectiveness of the proposed model. And the effect of TES and GSHP on the flexibility enhancement of CHP is discussed.