Cogeneration unit primary frequency modulation method based on heat supply network heat storage

Abstract

The invention discloses a cogeneration unit primary frequency modulation method based on heat supply network heat storage, and the method comprises the steps: S1, employing a machine learning method to mine the corresponding relation between the opening degree of a steam extraction valve of the combined heat and power generation unit and the unit electric power from the historical operation data of the heat supply pipe network and the combined heat and power generation unit under the conditions of different total steam flows; S2, performing online real-time prediction and situation evaluation on the total heat load of the heat supply pipe network by using a machine learning method; and S3, evaluating and calculating the heat storage capacity constraint in the heat supply pipe network on line in real time by adopting a method of combining a mechanism model and a data model, ensuring the constraint of the steam supply parameter quality of an end user, and analyzing the capacity margin of heat storage and heat release of the heat supply pipe network at the same time. According to the method for assisting the cogeneration unit in primary frequency modulation based on heat storage of the heat supply network, the primary frequency modulation capacity is evaluated online at any time, and the heat storage capacity of the heat supply network is used for assisting in frequency modulation according to needs.

Description

technical field [0001] The invention relates to a method for primary frequency regulation of a combined heat and power unit based on heat storage in a heat network, and belongs to the technical field of intelligent operation of the combined heat and power unit. Background technique [0002] At present, primary frequency regulation means that when each unit is connected to the grid, the frequency of the power grid will change slightly due to the influence of external load disturbance changes. The load is balanced to maintain the normal operating frequency of the power grid. The existing primary frequency regulation technology often adopts the method of forcibly adjusting the main steam regulating valve of the steam turbine, so that the electrical load can be changed rapidly in a short period of time. [0003] However, the current primary frequency modulation technology has many disadvantages, mainly including long response time and slow changes in electric loads. Even in the...

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Problems solved by technology

[0003] However, the current primary frequency modulation technology has many disadvantages, mainly including long response time and slow changes in electric loads. Even in the case of rapid load fluctuations, too slow primary frequency modulation technology will cause the problem of reverse frequency modulation. Combined heat and power Since the unit has systems with strong heat storage capacity such as heaters, heating network pipes, heat exchangers and heaters, the frequency regulation potential is huge

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