Battery SOC not dropping

Question

Sharul Baggio 2024-6-26

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https://ww2.mathworks.cn/matlabcentral/answers/2132041-battery-soc-not-dropping

回答： Umar 2024-6-26

redo_propeller.slx

Hello!

I am currently trying to run a system where a propeller requires a load provided by a motor and powered by a battery.

However, my battery SOC is not decreasing as how I imagine it to be. As shown in figure below:

I have attached my simulink file, and if anyone has any input do tell me how I could go about to fix this.

Note that, the parameter for the motor is "roughly" similar to my case.

And the parameter for the battery and 2-level converter are default values.

Thank you in advance :)!

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Answer 1

Umar 2024-6-26

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Hi Sharul,

To troubleshoot the Battery SOC decrease issue, you can start by checking the following:

Battery Model: Ensure that the battery model in your Simulink file accurately represents the behavior of your real battery. Check parameters like capacity, internal resistance, and efficiency. Motor Load: Verify that the motor load is correctly configured to draw power from the battery. Check the power consumption and efficiency of the motor. Simulation Time: Confirm that the simulation time is sufficient to observe a noticeable decrease in SOC. Adjust the simulation duration if needed. Connections: Double-check all connections between components to ensure the flow of power from the battery to the motor is correctly established.

Let me know if this helps resolve your problem.

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Sharul Baggio 2024-6-26

Hi @Umar, if it wont trouble you. I have problems check if the connection between the battery and motor is correct. Based on this screenshot. What do you think?

I have been playing around with the input. However, 1 way to see the SOC reduce is by increasing the input to Pm of motor to e+03 and above. Which is way too extreme.

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Answer 2

Umar 2024-6-26

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Hi Sharul,

Typically, in an electric vehicle system, the battery should be connected to a controller or power electronics unit that regulates the power flow to the motor. The SOC% block usually represents the state of charge of the battery, while the SOC vs Motor load block might be used to monitor how the motor load affects battery state of charge. If increasing the input to the motor (Pm) causes a drastic reduction in SOC, it could indicate an inefficiency in power management or a fault in the system configuration. It's essential to ensure that the power flow from the battery to the motor is optimized for efficiency and performance without causing undue strain on either component.