Electricity-heat combined system considering heat exchange delay characteristic and scheduling method thereof

Abstract

The invention discloses an electricity-heat combined system considering heat exchange delay characteristics and a scheduling method thereof. The method comprises the steps of establishing a heat exchange delay model; according to the heat exchange delay model, establishing an electricity-heat combined system optimal scheduling model considering the heat exchange delay characteristic; fitting the optimal scheduling model of the electric-heat combined system, and reducing the nonlinear degree of heat transfer constraints in the scheduling model; and according to the fitted heat transfer constraints, solving the optimal scheduling model of the electricity-heat combined system and obtaining a scheduling result. An objective function in the scheduling model takes minimum system coal consumptionas an objective, and constraint conditions of the objective function comprise heat exchange process constraints and system operation constraints; the heat exchange process constraints comprise a heattransfer process constraint and a heat exchange delay constraint. According to the invention, the heat transfer process and heat exchange delay are considered, and the analysis of the heat storage, release and transfer processes is more accurate; sensitivity analysis is carried out on different factors influencing heat exchange delay; and a reference is provided for an operator to select proper parameters in scheduling.

Description

technical field [0001] The invention belongs to the field of optimal dispatching of a combined electric heating system, and more specifically relates to a combined electric heating system and a scheduling method thereof considering heat exchange delay characteristics. Background technique [0002] The integrated energy system is one of the most effective measures to enhance the flexibility of the power system. Combined heat and power units are the most common electrothermal coupling elements in integrated energy systems. However, the strong coupling relationship between its electrical output and thermal output results in a lack of operational flexibility. Therefore, improving the adjustment ability and flexibility of cogeneration units has become a current research hotspot. [0003] In order to reduce wind curtailment and promote wind power consumption, a lot of work has been done on improving the adjustment capability of cogeneration units. Decoupling the coupling constr...

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Problems solved by technology

[0007] Aiming at the defects of the prior art, the purpose of the present invention is to provide a dispatching method of the combined electric heating system considering the delay characteristics of heat transfer, aiming at solving the problem of not considering the characteristics of the components themselves, the delay characteristics of heat transfer and the insufficient dispatching model in the prior art The problem of precision leads to inaccurate calculation results and a large gap between them and the actual situation

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