Power storage capacity allocation method in consideration of microgrid grid-connected and off-grid switching

A capacity configuration and power energy storage technology, applied in circuit devices, electrical components, AC network circuits, etc., can solve the problems of not considering the influence of discharge power, not giving economic analysis, ignoring on-grid switching, etc. The effect of reducing the energy storage capacity

Active Publication Date: 2018-10-02
DONGHUA UNIV
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Problems solved by technology

[0003] The current configuration of energy storage capacity generally ignores on-grid and off-grid switching, and only discusses it from a single state
Secondly, there is no economic analysis when high-rate batteries are used in frequency modulation
Finally, the economic modeling is not detailed enough, for example, it does not consider the impact of platform voltage drop on discharge power during high C discharge and accelerated conversion of battery life during group operation

Method used

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  • Power storage capacity allocation method in consideration of microgrid grid-connected and off-grid switching
  • Power storage capacity allocation method in consideration of microgrid grid-connected and off-grid switching
  • Power storage capacity allocation method in consideration of microgrid grid-connected and off-grid switching

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Embodiment Construction

[0023] Below in conjunction with specific embodiment, further illustrate the present invention. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the teachings of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

[0024] Embodiments of the present invention relate to a power storage capacity configuration method considering microgrid and off-grid switching, such as figure 1 As shown, the basic process is: change the energy storage, diesel engine, and maximum charge and discharge rate by a fixed step size to obtain the microgrid capacity configuration when the economy is optimal, and give the corresponding load shedding rate and load she...

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Abstract

The invention relates to a power storage capacity allocation method in consideration of microgrid grid-connected and off-grid switching. The method comprises the following steps: according to data fitting, the relationship between capacity and a discharge rate of a selected lithium battery, the relationship between output and the discharge rate and the relationship between a cycle life and the discharge rate are obtained; in the case of off grid, according to an operation strategy, the power of energy storage and a diesel generator under different operation conditions is solved; in the case ofgrid connection, according to an operation strategy, the power of energy storage and a tie line under different operation conditions is solved; and according to the power of the energy storage and the diesel generator and the power of the energy storage and the tie line, the energy storage power and the capacity are calculated; economic modeling in the case of off grid and grid connection is carried out; and with the economic optimum as a target and with a load shedding rate and load shedding expectation as indexes, the energy storage and the diesel generator capacity are changed at a fixed step size for optimization so as to obtain the optimal energy storage and the optimal diesel generator capacity. The power demands can be greatly reduced.

Description

technical field [0001] The invention relates to the technical field of micro-grid capacity configuration, in particular to a power storage capacity configuration method considering micro-grid and off-grid switching. Background technique [0002] Traditional thermal power generation is gradually decreasing in Europe and the United States, and globally, the rate of decline may reach its peak in 2026. my country plans to give 15% of the total energy consumption to non-fossil energy in 2020. Due to the intermittent nature of light and the high prices of photovoltaic panels and energy storage batteries, it is of great practical significance to configure solar storage with reliability and economy in mind. [0003] The current energy storage capacity configuration generally ignores on-off and off-grid switching, and only discusses it from a single state. Secondly, there is no economic analysis when high-rate batteries are used in frequency modulation. Finally, the economic model...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/32H02J3/46H02J3/00
CPCH02J3/008H02J3/32H02J3/46H02J2203/20
Inventor 李征田星星李利明
Owner DONGHUA UNIV
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