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Hybrid energy storage photovoltaic power fluctuation stabilizing method

A power fluctuation, hybrid energy storage system technology, applied in photovoltaic power generation, reducing/preventing power oscillation, energy storage, etc., can solve the problems of not considering battery life loss, not fully considering the difference in dynamic characteristics of batteries and supercapacitors, etc.

Inactive Publication Date: 2016-01-06
STATE GRID CORP OF CHINA +3
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Although a lot of research has been done by relevant personnel, the existing methods for stabilizing photovoltaic power fluctuations in energy storage systems are still immature. Considering the life loss of the battery due to overcharging and overdischarging, it is urgent to improve

Method used

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  • Hybrid energy storage photovoltaic power fluctuation stabilizing method
  • Hybrid energy storage photovoltaic power fluctuation stabilizing method
  • Hybrid energy storage photovoltaic power fluctuation stabilizing method

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Embodiment 1

[0037] Such as figure 1 As shown, the hybrid energy storage system includes a storage battery and a supercapacitor, and the storage battery and the supercapacitor are respectively connected to a DC bus through first to second bidirectional DC / DC converters.

[0038] Such as figure 2 As shown, a method for stabilizing photovoltaic power fluctuations in a hybrid energy storage system, the hybrid energy storage system including a storage battery and a super capacitor, is characterized in that it includes the following steps:

[0039] Step 1: iteratively calculate the charging and discharging reference power P of the storage battery B_ref (k+1):

[0040] P B _ r e f ( k + 1 ) = τ B τ B ...

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Abstract

A method for stabilizing photovoltaic power fluctuation in a hybrid energy storage system includes the steps of: calculating a low-pass filtering constant, and performing low-pass filtering on photovoltaic power; calculating charging and discharging reference power of a storage battery; calculating charging and discharging reference power of a supercapacitor; and performing hybrid energy storage and charging and discharging at the same time, thereby achieving the purpose of stabilizing photovoltaic power fluctuation. The method provided by the invention can determine charging and discharging schemes of different time scales according to difference of storage battery and supercapacitor hybrid energy storage dynamic response characteristics, thereby achieving the purpose of stabilizing photovoltaic power; and residual energy of the storage battery is considered, the filtering coefficient is adjusted, and deep charging and discharging of the storage battery are prevented, thereby achieving the purposes of prolonging the service life of the storage battery and improving system economical efficiency.

Description

technical field [0001] The invention relates to a method for stabilizing photovoltaic power fluctuations, in particular to a hybrid energy storage method for stabilizing photovoltaic power fluctuations, belonging to the technical field of renewable energy power generation. Background technique [0002] With the increasing consumption of traditional energy, resource shortage and environmental pollution have become the focus of the world. Renewable energy power generation provides an effective way to solve resource and environmental problems. [0003] Taking photovoltaic power generation as an example, photovoltaic power generation has strong intermittency and uncertainty, and it is of great significance to configure energy storage devices for stabilizing photovoltaic power output. Among the existing energy storage devices, batteries have the characteristics of large capacity, high energy density, and low cost, but they cannot provide high power instantly; on the contrary, su...

Claims

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Application Information

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IPC IPC(8): H02J3/24H02J3/32
CPCY02E10/56Y02E70/30
Inventor 王东方张海宁李春来杨立滨贾昆张节潭杨军李正曦樊世通
Owner STATE GRID CORP OF CHINA
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