Islet microgrid unified SoC balancing control method

A technology of balance control and micro-grid, which is applied in the field of micro-grid and electric energy storage system, and can solve problems such as unstable SOC balance control and complex control strategies

Active Publication Date: 2017-06-13
CENT SOUTH UNIV
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Problems solved by technology

[0008] The present invention provides a unified SoC balance control method for island micro-grids based on low-bandwidth distributed communication to solve the technical problems of unstable SOC balance control and complex control strategies of distributed energy storage systems in existing island micro-grids

Method used

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  • Islet microgrid unified SoC balancing control method
  • Islet microgrid unified SoC balancing control method
  • Islet microgrid unified SoC balancing control method

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Embodiment Construction

[0054] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0055] The present invention provides an island micro-grid unified SOC balance control method based on low-bandwidth distributed communication. The structure of the microgrid is introduced.

[0056] see figure 1 shown, combined with figure 2 As shown, the island microgrid based on low-bandwidth distributed communication in the present invention includes several distributed micro-sources, several distributed distributed energy storage units, busbars and public loads connected to the busbars, and several distributed The micro-sources are connected in parallel with each other, and several parallel-connected micro-sources are connected to the busbar through transmission li...

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Abstract

The invention discloses an islet microgrid unified SoC balancing control method. The method comprises the steps of obtaining state of charge (SOC) rectifying information of each distributed energy storage unit, using the state of charge (SOC) rectifying information based on the condition of low bandwidth distributed communication to adjust a drooping coefficient of each distributed energy storage unit, adjusting an angular frequency reference value of each distributed energy storage unit by adjusting the drooping coefficient of each distributed energy storage unit so that charge-discharge power of each distributed energy storage unit can be in an optimal state, and equipartition of load power and the balance of the state of charge (SOC) of each distributed energy storage unit can be finally achieved. In this way, the purpose is achieved that one control strategy is applicable to SOC balance control in the charging state and SOC balance control in the discharging state simultaneously, thus the control strategy of the charging and discharging mode is unified, and the shortcoming that the system is unstable caused by conversion of control strategies in the charging and discharging process is overcome.

Description

technical field [0001] The present invention relates to the technical field of micro-grids and electric energy storage systems, and more specifically, to a unified SoC balance control method based on low-bandwidth distributed communication island micro-grids. Background technique [0002] Microgrid includes various forms of distributed power sources, energy storage devices, loads, energy conversion devices, monitoring and protection devices. It is an autonomous system capable of self-control, protection and management. It has two operating modes: island and grid-connected. On the one hand, the microgrid can be regarded as a small power system. Because it has a good energy management function, it can effectively maintain the optimal distribution and balance of energy in the microgrid and ensure the economical operation of the microgrid. On the one hand, the microgrid can be regarded as a "virtual" power source or load in the power distribution system, which can coordinate and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/28
CPCH02J3/28H02J3/38H02J3/388
Inventor 粟梅罗超施光泽韩华孙尧罗朝旭柳张杰
Owner CENT SOUTH UNIV
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