Composite energy storage microgrid grid connection coordination control method and system

A coordinated control system and multi-element energy storage technology, applied in wind power generation, current collectors, photovoltaic power generation, etc., can solve the problems of battery overcharge and overdischarge, service life decline, etc.

Active Publication Date: 2019-06-18
NARI TECH CO LTD +4
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  • Application Information

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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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  • Composite energy storage microgrid grid connection coordination control method and system
  • Composite energy storage microgrid grid connection coordination control method and system
  • Composite energy storage microgrid grid connection coordination control method and system

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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 composite energy storage microgrid interconnection coordination control method and system. The method comprises the steps as follows: an energy storage management station receives a control command of a microgrid energy management system and state feedback commands of a super-capacitor energy storage module and a lithium iron phosphate battery energy storage module, controls a first energy storage converter and a second energy storage converter, and controls a super-capacitor and a lithium iron phosphate battery to work under any one of the following working conditions: the first working condition: a composite energy storage system adopts the working condition of smoothening power fluctuation; the second working condition: the composite energy storage system adopts the working condition of tracing and scheduling the output; and the third working condition: the composite energy storage system adopts the working condition of peak shaving and valley filling. According to the method and system provided by the invention, the running stability of the microgrid is improved, and the security and stability of the wind power generation system and the photovoltaic power generation system accessing the large power grid system are ensured.

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 consists 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 status 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 decrease...

Claims

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Application Information

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Patent Type & Authority Applications(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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