Micro-grid optimization scheduling method considering variable depreciation cost of lithium battery and practical charge and discharge strategy

A depreciation cost, lithium battery technology, applied in the direction of climate sustainability, sustainable manufacturing/processing, AC network load balancing, etc., can solve problems such as imperfect research on lithium battery operation management system

Active Publication Date: 2015-12-09
BEIJING BEIBIAN MICRO GRID TECH +1
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However, in contrast to this, the research on the operation and managem

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  • Micro-grid optimization scheduling method considering variable depreciation cost of lithium battery and practical charge and discharge strategy
  • Micro-grid optimization scheduling method considering variable depreciation cost of lithium battery and practical charge and discharge strategy
  • Micro-grid optimization scheduling method considering variable depreciation cost of lithium battery and practical charge and discharge strategy

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Embodiment Construction

[0076] The invention discloses a micro-grid scheduling method considering the variable depreciation cost of lithium batteries and charging and discharging strategies, which mainly embodies the innovations in the following aspects: (1) The depreciation cost composition of lithium batteries is analyzed, and the lithium battery related to the discharge depth is proposed. Battery life model, on this basis, a variable depreciation cost model of lithium batteries dependent on discharge depth is established, and used to strengthen the economic management of lithium batteries; (2) A charge-discharge strategy with variable upper limit constraints is proposed to improve lithium battery The operating conditions of the battery, the charging and discharging strategy can prevent excessive aging or depreciation of the lithium battery, and is beneficial to prolong its service life; (3) Establish a microgrid economy that considers the variable depreciation cost of the lithium battery and a pract...

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Abstract

The invention relates to a micro-grid scheduling method considering the variable depreciation cost of a lithium battery and a charge and discharge strategy. According to the relation between the cycling life and the discharge depth of the lithium battery, a variable depreciation cost model of the lithium battery depending on the discharge depth is built, the variable depreciation cost model is involved in a scheduling model target function enabling the operation cost of a micro-grid to be minimum so that economic management of the lithium battery is realized, the target function is shown in the description, wherein f refers to the operation cost of a micro-grid system, and deltaU<ST><k> refers to the variable depreciation cost of the lithium battery k in one-time charge and discharge cycling process. During solution, linearization equivalence of a charge and discharge power curve is performed in a typical charge and discharge strategy of the lithium battery, then the charge and discharge power curve is regarded as an allowed power limit value in an operation process of the lithium battery, and the typical charge and discharge strategy of the lithium battery comprises a two-segment charging process of constant current charging and constant voltage charging and a constant current discharge process. According to the method, excessive aging or depreciation of the lithium battery can be effectively prevented, the service lifetime of the lithium battery can be extended, and the overall operation cost of the micro-grid is reduced.

Description

technical field [0001] The invention relates to the field of operation management of energy storage in a power system, in particular to a practical charging and discharging strategy and an optimal scheduling method for a lithium battery in a microgrid. Background technique [0002] Under the background of the current energy crisis and environmental problems, the development of microgrid has a good prospect. It is an effective organizational form for fully utilizing distributed power generation such as wind power and photovoltaics. The intermittent and random nature of distributed power generation brings great challenges to the stable operation and power balance control of microgrid. Therefore, the microgrid generally needs to be equipped with an energy storage system to balance the instantaneous power fluctuation, maintain the stable operation of the microgrid, and play the role of peak shaving and valley filling. [0003] The energy management system is an important guara...

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Application Information

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IPC IPC(8): H02J3/28
CPCY02P80/14
Inventor 祝振鹏刘世民王秀丽刘春阳杨博张忠王建学
Owner BEIJING BEIBIAN MICRO GRID TECH
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