Week 8 Challenge

Load the UC parameter file. Complete the Ultracapacitor model. Set simulation stop time to 598 sec.

The model output should give, current, SOC and Voltage as output

Aim:To model the energy storage device as ultracapacitor and analyse its operating characteristics according to the power demand by running the model for 598 sec.

A supercapacitor (SC), also called an ultracapacitor, is a high-capacity capacitor with a capacitance value much higher than other capacitors, but with lower voltage limits, that bridges the gap between electrolytic capacitors and rechargeable batteries. It typically stores 10 to 100 times more energy per unit volume or mass than electrolytic capacitors, can accept and deliver charge much faster than batteries, and tolerates many more charge and discharge cycles than rechargeable batteries.

Supercapacitors are used in applications requiring many rapid charge/discharge cycles, rather than long-term compact energy storage in automobiles, buses, trains, cranes and elevators, where they are used for regenerative braking, short-term energy storage, or burst-mode power delivery. Smaller units are used as power backup for static random-access memory (SRAM).

Unlike ordinary capacitors, supercapacitors do not use the conventional solid dielectric, but rather, they use electrostatic double-layer capacitance and electrochemical pseudocapacitance, both of which contribute to the total capacitance of the capacitor, with a few differences.

Simulink Model

Procedure:

Signal builder block is used as a power demand source.

In the Ultracapacitor subsystem ,current and voltage calculation subsystem and SOC calculation subsystem is

In the charge and voltage calculation subsystem ,the current ,voltage,open circuit voltage and charge calculation subsystem is formed.

Input to the current subsystem is power demand from the signal buider and feedback from the SOC.

Then the SOC calcualtion also done here by using the formula.

The input to OCV subsystem is current.The Open circuit voltage is calculated by using the formula.

The input to voltage subsystem is current and SOC.Voltage is calculated is using the formula,

Charge calculation

The charge can be calculated byusing the above formula

Voltage Calculation

SOC calculation

Here SOC is subtracted from the initial SOC to get the instantaneous SOC.

Parameters

Output results