Combined heat and power dynamic economic dispatch considering field operational characteristics of natural gas combined cycle plants

Abstract

Combined heat and power dynamic economic dispatch (CHPDED) is one of the key technologies for the efficient operation of natural gas combined cycle (NGCC) plants in integrated energy systems. In this study, based on the actual operational characteristics of NGCC plants at combined heat and power mode, a plant advanced loads variation capacity model is developed. The advanced loads variation capacity models of NGCC plants are integrated into the CHPDED model to guarantee the feasibility of the dispatched demands. Moreover, a field operational data based simplification method for the advanced loads variation capacity model is proposed to alleviate the computational burden. The field operational data of an actual NGCC station is taken to perform case studies. The calculation cases show that all the dispatched demands calculated from the CHPDED model with advanced loads variation capacity models are feasible. Furthermore, the influence of the heat load variation process on the power load adjustment process is employed to achieve better dispatch results. Compared with CHPDED models in the existing research, the CHPDED model with advanced loads variation capacity models significantly improves the feasibility of the dispatched demands, thereby enhancing the real application value of CHPDED in the field operation of NGCC plants.