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State of charge control method for energy storage battery

A technology of energy storage battery and control method, applied in the direction of AC network load balancing, etc., can solve problems such as affecting the effect of fluctuation and smoothing

Inactive Publication Date: 2016-10-26
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method can effectively realize the adjustment of SOC, but it will affect the effect of fluctuation stabilization

Method used

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  • State of charge control method for energy storage battery
  • State of charge control method for energy storage battery
  • State of charge control method for energy storage battery

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Experimental program
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Embodiment

[0036] figure 1 It is a schematic flow chart of the method for controlling the state of charge of the energy storage battery of the present invention. Such as figure 1 As shown, the method for controlling the state of charge of the energy storage battery of the present invention includes the following steps:

[0037] S1: Using a subtractor to set the SOC value of the energy storage battery to SOC ref and the current SOC state value SOC of the energy storage battery bat Make a difference to get ΔSOC=SOC ref -SOC bat , while the SOC bat Input the filter time constant control module to obtain the filter time constant τ.

[0038] The filter time constant control module is based on the current SOC state value SOC bat range, the filter time constant of the low-pass filter is calculated, and different ranges correspond to different battery states, and the calculation formula of the filter time constant is also different. Table 1 is the control law of the filter time constant ...

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Abstract

The invention discloses a method for controlling the state of charge of an energy storage battery. Firstly, the difference ΔSOC between the SOC setting value SOCref of the energy storage battery and the current SOC state value SOCbat of the energy storage battery is calculated, and at the same time, the SOCbat is input into the filter time constant control The module obtains the filtering time constant τ, passes ΔSOC through the dead zone control module and the PI controller to obtain the control quantity PSOC, passes the control quantity PSOC through a low-pass filter with a filtering time constant of τ, and obtains the power quantity Pbat controlled by the SOC, and converts the power quantity Pbat After being superimposed with the given power Pref of the energy storage battery, the limiter module is used to limit the amplitude to obtain the actual given power of the energy storage battery. The method of the invention effectively controls the state of charge of the energy storage battery, which can not only ensure the effect of fluctuation stabilization , and can improve the service life of the battery.

Description

technical field [0001] The invention belongs to the technical field of energy storage battery control, and more specifically relates to a method for controlling the state of charge of an energy storage battery. Background technique [0002] In the wind power generation / photovoltaic power generation system, due to the randomness and fluctuation of wind speed / irradiance, the output power also has the characteristics of randomness and fluctuation. Large-scale new energy grid-connected power generation will lead to changes in the frequency and voltage of the grid, thereby affecting the normal operation of the power system. It is an effective solution to configure energy storage batteries with a certain capacity at the outlet of wind farms or photovoltaic power stations, and use the fast charging and discharging characteristics of energy storage batteries to stabilize their output power fluctuations. [0003] The energy storage system needs to manage the state of charge (State o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/32
CPCH02J3/32
Inventor 李凯邹见效郑宏徐红兵杨慧雯
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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