A microgrid operation optimization system and method based on combined electric and thermal dispatching

Abstract

The invention discloses a microgrid running optimization system and method based on power and heat combined dispatching. Running restrains such as the output force characteristic, start, stop and climbing of a distributed type generator set and the charge and discharge characteristics of power and heat energy storage are comprehensively considered, a microgrid power and heat combined dispatching model containing a fan, a photovoltaic cell, a combined heat and power generation system, an electric boiler, a fuel cell and an energy storage (electrical energy storage and heat energy storage) is built, the 0-1 mixed integer nonlinear programming method is adopted for solving the optimal output force and total running cost of all units in the network, and power and heat dispatching contrastive analysis is carried out on the system and a traditional separated generation and combined generation optimization model. In addition, the influences of the heat and power reliability difference on the running are analyzed and discussed, and therefore the heat and power dispatching module is more reasonable, comprehensive and universal.

Description

technical field [0001] The invention relates to a micro-grid operation optimization system and method based on combined electric-heat dispatching. Background technique [0002] With the adjustment of social energy structure, the development of power system and the maturity of energy storage technology, electric energy storage devices such as batteries and supercapacitors are widely used in power systems to improve the penetration rate of new energy and cooperate with other power sources in the network to realize electric energy. shaving peaks and filling valleys. In essence, the storage process of all energy (such as electrical energy, thermal energy and mechanical energy, etc.) can be called energy storage, but the current application of energy storage in power systems is actually limited to the storage of electrical energy, that is, the conversion of electrical energy into other forms of The energy is converted into electrical energy and fed back to the power system when ...

AI Technical Summary

Problems solved by technology

[0005] 1) The electricity and heat of the traditional electric heat distribution system are completely independent, which is not conducive to the unified coordination and dispatch of electric heat load;

[0006] 2) The operation mode of the combined heat and power system is relatively limited. The traditional combined heat and power generation works in the mode of "power determined by heat". which greatly limits its application

With the increasing electric heating peak-to-valley difference, this method can no longer meet the requirements of electric heating scheduling;

[0007] 3) The traditional electric heating scheduling model does not reflect the difference in electric heating reliability. In addition to the difference in electric heating transmission and storage, electric energy scheduling must always meet the balance of power supply and consumption. Due to the thermal inertia of related equipment, the thermal system can increase or decrease within a certain range heat load, so the reliability difference between the two needs to be discussed

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