Method for optimizing capacity of energy storage system in case of fluctuation of smooth and renewable energy sources electricity generation output

A technology for renewable energy and energy storage systems, applied in electrical energy storage systems, energy reserves, electrical components, etc., to solve problems such as fluctuations, incomplete factors, and failure to achieve practicality.

Active Publication Date: 2012-03-14
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +2
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  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to address the shortcomings of the current energy storage system capacity optimization method under the scenario of smoothing renewable energy output fluctuations that the factors considered are not comprehensi

Method used

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  • Method for optimizing capacity of energy storage system in case of fluctuation of smooth and renewable energy sources electricity generation output
  • Method for optimizing capacity of energy storage system in case of fluctuation of smooth and renewable energy sources electricity generation output
  • Method for optimizing capacity of energy storage system in case of fluctuation of smooth and renewable energy sources electricity generation output

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Embodiment

[0083] The energy storage system capacity optimization method proposed by the present invention is based on the output power spectrum analysis results of renewable energy sources, and can effectively provide the minimum capacity scheme of the energy storage system under the constraint of the target power output fluctuation rate after the energy storage system is compensated.

[0084] Before determining the capacity of the energy storage system, it is first necessary to select reasonable sample data of renewable energy output power according to its application scenario (long-term or short-term fluctuation smoothing). Parameters such as the sampling period of the sample data and the length of the data segment are directly related to the specific problems to be studied. When the energy storage system is used to smooth short-term power fluctuations of renewable energy, the smoothing time scale is generally on the order of seconds to tens of minutes. For example, it is most typical...

Embodiment approach

[0151] The best implementation mode of the present invention is as follows:

[0152] The present invention uses a test calculation example of smoothing the power output of a renewable energy generation system represented by wind power generation to verify the method for determining the capacity of the energy storage system. The wind speed data is the whole day data on July 14, 2010 in Washington State, USA, the sampling period is 1 minute, and the rated power of the wind turbine is 65kW. Use HOMER software to simulate fan output power, as attached figure 1 shown. The maximum output power of the fan is 65.097kW, the minimum power is 0, and the average output power is 24.869kW; the 20-minute fluctuation rate FR 20 The maximum value is 61.7%. Comprehensive charge and discharge efficiency of energy storage system η ES is 88%, the charging and discharging efficiencies are equal, both are 93.81%; the upper limit of SOC is 1, and the lower limit is 0.3. Referring to the 20-minut...

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Abstract

The invention provides a method for optimizing the capacity of an energy storage system in case of the fluctuation of smooth and renewable energy sources electricity generation output, which comprises the steps of: selecting reasonable renewable energy output power sample data before ensuring the capacity of the energy storage system, and sequentially ensuring the power, the capacity and the initial stress optical coefficient (SOC) status of the energy storage system after ensuring the reasonable renewable energy output power sample data. Aiming at overcoming the defect that the existing method for optimizing the capacity of the energy storage system in case of the fluctuation of the smooth and renewable energy sources output can not comprehensively consider all factors and can not reach the practical applicability, the invention provides the method for optimizing the capacity of the energy storage system in case of the fluctuation of the smooth and renewable energy sources electricity generation output based on a frequency spectrum analysis result of renewable energy sources output power. The method can provide the capacity scheme of the energy storage system limited by energy storage system-compensated target power output fluctuation ratio, and the method is practical, simple, quick and easy to realize.

Description

technical field [0001] The invention relates to a method for optimizing the capacity of an energy storage system for smoothing output fluctuations of renewable energy generation, and belongs to the transformation technology of the method for optimizing the capacity of an energy storage system for smoothing output fluctuations for renewable energy generation. Background technique [0002] The existing renewable energy represented by wind power and photovoltaic power generation has the characteristics of intermittency, randomness and uncertainty. As the penetration of renewable energy sources continues to increase, they pose increasing challenges to the safe and reliable operation of the grid. Energy storage systems can be effectively used to overcome the volatility of renewable energy generation systems by virtue of their rechargeable and rechargeable operating characteristics. [0003] The cooperation mode of energy storage system and renewable energy generation system can ...

Claims

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Application Information

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IPC IPC(8): H02J15/00
CPCY02E70/30
Inventor 饶宏董旭柱陆志刚刘怡陈波陈满李勇琦申刚刘中胜郭力
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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