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Simulation method of lead acid battery-based improved PNGV model

A lead-acid battery and simulation method technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problem of not considering the battery capacity temperature, the number of cycles and the depth of charge and discharge, the accuracy of the battery capacity is not high, and cannot be fully reflected Voltage transient change process and other issues

Active Publication Date: 2015-04-22
HUNAN UNIV +2
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Problems solved by technology

[0006] The present invention proposes a simulation method based on the improved PNGV model of lead-acid battery, and its purpose is to overcome the PNGV model of lead-acid battery in the prior art without considering that the battery capacity is affected by the charge and discharge current, temperature, cycle times and charge and discharge depth Influenced by other factors, the accuracy of the battery capacity measured by the model is not high, and it cannot fully reflect the transient change process of the voltage when the current changes instantaneously.

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  • Simulation method of lead acid battery-based improved PNGV model
  • Simulation method of lead acid battery-based improved PNGV model
  • Simulation method of lead acid battery-based improved PNGV model

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Embodiment Construction

[0036] The present invention will be further described below in conjunction with accompanying drawings and examples.

[0037] The invention proposes an improved PNGV model on the basis of the traditional PNGV model, so that it can better track the voltage transient change process of the battery during short-term charging and discharging under the condition of considering more external factors. The model is improved from two aspects of circuit structure and battery capacity.

[0038] 1. Correction of circuit structure

[0039] It can be seen from the constant current discharge voltage curve of the lead-acid battery that the voltage drops sharply at the moment the current is applied, which indicates that there is a certain internal resistance in the battery, which is represented by ohmic resistance in the model. The voltage then decays exponentially to a steady state, which can be represented by the voltage drop across the RC branch, and the voltage exponential decay time const...

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Abstract

The invention discloses a simulation method of a lead acid battery-based improved PNGV model. The operating characteristic of a lead acid battery serving as an energy storage component is described by an equivalent circuit; the equivalent circuit connects two RC parallel branches in series to replace a single RC parallel circuit in the traditional PNGV equivalent model circuit. The improved PNGV model adopting the two RC parallel branches can simulate the dynamic change process of each operating parameter during short-time charging / discharging of the battery well. Due to capacity modification, the model can simulate the change condition of the capacity of the battery under different working conditions, a researcher can find the battery with overlow capacity in time, and the cycle life of the battery can be predicted under different working conditions.

Description

technical field [0001] The invention relates to a simulation method based on an improved PNGV model of a lead-acid battery. Background technique [0002] With the increasing demand for energy, the development and utilization of clean and renewable new energy has become a major social issue related to human survival and development, including solar power, wind power, tidal power, biomass power, etc. Therefore, it has been highly valued and developed rapidly. However, the fatal weakness of new energy power generation is that its output power is fluctuating and intermittent, which will cause the frequency and voltage of the grid to deviate from the rated value, causing a series of adverse effects on the power quality of the grid, and bringing difficulties to power dispatching and power generation planning. In order to solve the above problems, large-scale energy storage technology is used to absorb power when the power grid is in surplus, and release power when the power grid ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/36
Inventor 李欣然黄际元曹一家贺惠民吴涛李善颖张娟马亚辉程兴婷周婷婷徐婷婷
Owner HUNAN UNIV
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