RLS and EKF algorithms based full-vanadium flow battery SOC estimation method

An all-vanadium redox flow battery and algorithm technology, which is applied in the direction of measuring electricity, measuring electrical variables, and measuring devices, can solve problems such as inaccurate SOC estimation, increased system configuration, and unconsidered parameters, so as to facilitate later maintenance and system configuration. Simple, Highly Accurate Effects

Active Publication Date: 2017-03-15
HEFEI UNIV OF TECH
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Problems solved by technology

Patent "On-line detection method of charge state of flow battery based on potential difference parameters" (patent number: 200910088258.0), the reference solution with known state of charge is combined with positive electrode and negative electrode electrolyte respectively to form a new battery, increasing The system configuration; literature (State of charge monitoring for vanadium redox flow batteries by the transmission spectrum ofV(IV)/V(V)electrolytes) and literature (Research on State of Charge Monitoring for Vanadium Redox Flow Batteries) by installing state monitoring batteries To measure the open circuit voltage of the all-vanadium redox flow battery, and then estimate the battery SOC according to the open circuit voltage, but this method needs to connect the state monitoring battery with the pipeline in the system, the installati

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  • RLS and EKF algorithms based full-vanadium flow battery SOC estimation method
  • RLS and EKF algorithms based full-vanadium flow battery SOC estimation method
  • RLS and EKF algorithms based full-vanadium flow battery SOC estimation method

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Embodiment Construction

[0035] In this embodiment, a method for estimating the SOC of an all-vanadium redox flow battery based on the RLS algorithm and the EKF algorithm includes establishing a mathematical model of the all-vanadium redox flow battery, using the RLS algorithm to perform parameter identification on the mathematical model of the all-vanadium redox flow battery, The EKF algorithm is used to estimate the SOC of the all-vanadium redox flow battery, and the RLS and EKF are combined to update the model parameters of the all-vanadium redox flow battery in real time, and then a new SOC estimation is performed according to the updated model parameters.

[0036] In the specific example, a 5kW / 30kWh all-vanadium redox flow battery is taken as an example for description, and the parameters of the all-vanadium redox flow battery are shown in Table 1.

[0037] Table 1 Parameters of all-vanadium redox flow battery

[0038] Parameter name / unit value Power / kW 5 Energy / kWh 30 ...

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Abstract

The invention discloses an RLS and EKF algorithms based full-vanadium flow battery SOC estimation method, comprising: 1) building a mathematical model for a full-vanadium flow battery; 2) using the RLS algorithm to identify parameters of the mathematical model for the full-vanadium flow battery; 3) using the EKF algorithm to estimate the SOC of the full-vanadium flow battery; and 4) combining the RLS algorithm and the EKF algorithm; updating in real time the model parameters for the full-vanadium flow battery; and according to the updated model parameters, conducting new SOC estimations. The method of the present invention achieves on-line updating of model parameters and accurate SOC estimation without additional system configuration.

Description

technical field [0001] The invention relates to the technical field of SOC detection of all-vanadium redox flow batteries, in particular to a method for estimating the SOC of all-vanadium redox flow batteries based on RLS and EKF algorithms. Background technique [0002] With the increasingly serious environmental pollution and energy crisis, it is imperative to develop renewable energy power generation systems. However, the inherent randomness and intermittent characteristics of renewable energy power generation have seriously affected the safety and economic operation of the power grid system; the problem of "abandoning light and wind" has seriously hindered the development of new energy and has become a major bottleneck that needs to be solved urgently question. [0003] As an effective way, energy storage turns intermittent, unstable, and uncontrollable renewable energy into stable, controllable, high-quality energy with high power quality, and at the same time provides...

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Application Information

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IPC IPC(8): G01R31/36
CPCG01R31/367
Inventor 邱亚李鑫倪宵余玲张微微
Owner HEFEI UNIV OF TECH
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