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A method and system for multi-energy storage microgrid grid-connected coordination control

A technology of coordinated control system and multiple energy storage, applied in wind power generation, collectors, electric vehicles, etc., can solve the problems of reduced service life, battery overcharge and overdischarge, etc.

Active Publication Date: 2021-07-02
NARI TECH CO LTD +4
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Problems solved by technology

The current micro-grid energy storage system mostly adopts the form of battery energy storage. Power changes, load fluctuations, micro-grid operating modes, and different working states of the energy storage system under different time scales can easily cause overcharging and over-discharging of the battery and decrease in service life. question

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  • A method and system for multi-energy storage microgrid grid-connected coordination control

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Embodiment Construction

[0055] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0056] In order to achieve the diversity of micro-grid operation requirements, and considering the advantages of high power density of supercapacitors and high energy density of lithium iron phosphate batteries, a multi-element energy storage system using supercapacitors + lithium iron phosphate batteries is proposed. High-frequency power fluctuations with small power amplitudes are compensated by power-type energy storage supercapacitors, while low-frequency power fluctuations with long-term scale and large power amplitudes are compensated by energy-type energy storage lithium iron phosphate batteries. Since the microgrid has various requirements for the working state of the energy storage system in the grid-connected mode, it is necessary to desi...

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Abstract

The invention discloses a multi-element energy storage micro-grid grid-connected coordination control method and system thereof. The method is as follows: the energy storage management station receives the control instructions of the micro-grid energy management system and the supercapacitor energy storage module and lithium iron phosphate battery energy storage The state feedback command of the module controls the first energy storage converter and the second energy storage converter, and controls the supercapacitor and lithium iron phosphate battery to work in any of the following working states: working state 1: the multi-element energy storage system adopts The working state of smoothing power fluctuations; working state 2: the multivariate energy storage system adopts the working state of tracking and dispatching output; working state 3: the multivariate energy storage system adopts the working state of peak shaving and valley filling. The invention improves the reliability of the operation of the micro-grid, and ensures the safety and stability of the wind power generation system and the photovoltaic power generation system connected to the large power grid system.

Description

technical field [0001] The invention relates to a multi-element energy storage micro-grid grid-connected coordination control method and a system thereof, belonging to the technical field of micro-grid grid-connected operation. Background technique [0002] The proposal of the microgrid provides a reasonable direction for solving large-scale new energy access to the grid. [0003] A typical microgrid is composed of distributed power generation units, energy storage systems and loads, and the microgrid energy management system controls the microgrid operation mode, and the energy storage management station controls the working state of the energy storage system. The current micro-grid energy storage system mostly adopts the form of battery energy storage. Power changes, load fluctuations, micro-grid operating modes, and different working states of the energy storage system under different time scales can easily cause overcharging and over-discharging of the battery, and decre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/28H02J3/32H02J3/24H02J3/38H02J7/34
CPCY02E10/56Y02E10/76Y02E70/30
Inventor 牟晓春赵雪储厚成程谦张青杰邹宁施胜丹田安民吴通华戴魏李新东
Owner NARI TECH CO LTD
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