Active balancing control method for lithium battery packs based on model predictive control
A model predictive control, lithium battery pack technology, applied in charge equalization circuits, electric vehicles, battery circuit devices, etc., can solve problems such as the large amount of calculation of the brute force enumeration method, and achieve the effect of reducing the amount of calculation.
Active Publication Date: 2021-03-23
ZHEJIANG UNIV
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[0004] The present invention mainly provides a battery pack active equalization control method based on model predictive control, which proposes a model of an active equalizer and an optimized objective function for equalization, and converts the original problem into an integer programming problem of least squares Solving the optimal control sequence, this method solves the problem of large amount of calculation in the direct model predictive control using the violent enumeration method, which is of great significance to the active equalizer control strategy
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[0049] The present invention further explains the active equalization control strategy of the lithium battery pack based on the model predictive control in combination with a specific test verification process.
[0050] An active equalization control method for a lithium battery pack based on model predictive control, the lithium battery pack includes a plurality of single cells, and each single cell is connected in parallel with a DC / DC converter composed of a bidirectional counter-attack circuit, comprising the following steps :
[0051] Step 1: Establish the state-space model of the active equalizer:
[0052] The working diagram of the equalizer is as follows: figure 2 As shown, for a single battery cell i , i=1,2...S
[0053] ·When the cell i When discharging, the cell i Loss of charge (S-1)*I 0 , cell j≠i get charge I 0 ;
[0054] ·When the cell i When charging, cell i Get the charge (S-1)*I 0 , cell j≠i Lost charge I 0 ;
[0055] ·When cell i When not char...
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The invention discloses a model forecast control-based active equilibrium control method of a lithium battery pack. Each single battery is connected in parallel with an active equalizer, the active equalizer comprises a DC / DC converter, the DC / DC converter comprises a bidirectional counter circuit, the active equalizer is modeled, model forecast control is used by taking the model as a base, an optimal equalizer control sequence is obtained by integer planning and branch defining method, and all single batteries can charge or discharge at the same moment by the equalizer; since an equalizationcurrent is fixed, each equalizer is in one of a discharging state, a standing state or a charging state at each moment, the integer planning and the branch defining method are introduced into designof equalizer control, and the calculation quantity of searching the optimal control sequence of model forecast control is effectively reduced; and compared with a traditional active equilibrium design, the equalizer has the advantages of rapid equilibrium convergence speed, and the calculation quantity of searching the optimal control sequence during the equilibrium process is greatly reduced.
Description
technical field [0001] The invention relates to a control method for an active equalizer of a lithium battery pack, in particular to an active equalization control method for a lithium battery pack based on model predictive control. Background technique [0002] The balance of the battery pack is an effective technology to realize the effective use of battery power and ensure the safety of charging and discharging the battery pack. Due to the differences between individual batteries during production and the differences in working conditions during use, the capacity difference between individual batteries becomes larger and larger with time. When the battery is fully charged first, the entire battery pack needs to stop charging (otherwise the fully charged battery will explode due to overcharging), such as figure 1 As shown in (1); in the same way, the battery with the lowest capacity is the first to run out of charge during the discharge process, causing the entire battery...
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IPC IPC(8): H02J7/00
CPCH02J7/0016H02J7/0018
Inventor 黄炜刘之涛谢磊苏宏业
Owner ZHEJIANG UNIV