关键词: 供热机组, 以热定电, 能量平衡, 杂散损耗

Abstract: The heating unit modeling using energy balance makes it possible to calculate real time maximum and minimum power outputs according to the information of residential and industrial heat supplies, which will provide valid information such as the power output range of cogeneration units for system dispatcher. However, the heat losses such as steam leakage of valves caused by steam turbine internal flow is not taken into account in the modeling with theoretical energy balance methodology, which incurs significant errors in practical operation of heating generators. Based on the facts that high correlation exists between the actual power curve and the theoretical curve under different heat supplies, the linear combinatory expressions identical to theoretical model structure is added to the rectified model. Meanwhile all parameters are re-identified by utilizing the least squares methodology. After correction, the heat losses are fully considered in the rectified energy balance model, which can reflect the relationship between power output and heat supply of heating units more precisely. The accuracy, reasonableness and feasibility of the rectified model are verified through field tests.

Key words: heating unit, power output set by heat, energy balance, generation loss