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Charge state control method of energy storage battery

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

Inactive Publication Date: 2015-03-11
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • 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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  • Charge state control method of energy storage battery
  • Charge state control method of energy storage battery
  • Charge state control method of energy storage battery

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Embodiment

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

[0037] S1: Use a subtractor to set the SOC value of the energy storage battery ref And the current SOC state value of the energy storage battery SOC bat Make difference to get ΔSOC=SOC ref -SOC bat , And 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 The filter time constant of the low-pass filter is calculated. 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 control module.

[0039] SOC bat Interval

Battery ...

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Abstract

The invention discloses a charge state control method of an energy storage battery. The charge state control method comprises the following steps: at first, calculating a difference value delta SOC between an SOC set value SOC ref of the energy storage battery and the current SOC state value SOC bat of the energy storage battery, simultaneously inputting the SOC bat into a filtering time constant control module to obtain a filtering time constant tao, obtaining a control quantity PSOC through a dead zone control module and a PI (Proportional Integral) controller according to the delta SOC, obtaining a power quantity Pbat controlled by SOC through a low pass filter with the filtering time constant tao according to the control quantity PSOC, carrying out amplitude limit by an amplitude limiting module after overlapping the power quantity Pbat with the given power Pref of the energy storage battery to obtain the actual given power of the energy storage battery. The method effectively controlling the charge state of the energy storage battery not only can ensure the fluctuation inhibiting effect, but also can prolong 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 state-of-charge control method of an energy storage battery. Background technique [0002] In wind power / photovoltaic power generation systems, due to the randomness and volatility of wind speed / light, the output power also has the characteristics of randomness and volatility. Large-scale grid-connected power generation of new energy will cause changes in the frequency and voltage of the grid, which will affect the normal operation of the power system. It is an effective solution to configure energy storage batteries with a certain capacity at the exit of wind farms or photovoltaic power stations, and use the fast charge and discharge characteristics of energy storage batteries to smooth out fluctuations in their output power. [0003] The energy storage system needs to manage the state of charge (SOC) of the energy storage battery while suppre...

Claims

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Application Information

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Patent Type & Authority Applications(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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