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

Ultracapacitor:-

An Ultracapacitor also known as a supercapacitor or electrochemical capacitor is a device for storing electrical enegry which is growing radpidly in popularity The design and mechanism of operation is somewheer between and ordinary capacitor and a battery which open up some interesting and valuable applications

Like a battery a single ultrcapacitor cell consists of a positive and negative electrode seperated by an electrolyte However ultracapacitor store energy electrostatically like e regualr capacitor not chemically like a battery there is a dielectric seperator dividing the electrolyte also like a capacitor

Th small seperation between electrodes permitted by this structure lead to much higher energy density than a normal capacitor whilst a ultracapacitor stores less enegry than a eauivalenlty sized battery it can release it much quicker as the discharge is not depenedent on a chemical reaction taking place

Because no physical or chemical changes occur when charge is stored ultracapacitorn can also be used many times over without degradation

STEPS TO CONSTRCUT UC MODEL:-

There equation in UC model are defined first which gives us SOC Current and OCS

These are the 3 parameters which infulences UC

* OCV Defines the SOC of Ultracapacitor

* Max Voltage or voltage is directly proportional to the charge stored in the battery

* Amount if the charge is directly proportional to the current that can flow in the ckt.

where Q is electric quantity or charge on UC

I is current

Q depends on capacitance which is the charge storage capacity measured in Farads

The Ocv is a measure of the electric field between plates

OCV= integration (I/c)dt

* Capacitance and OCv gives Q

The integration if current over C gives OCV

In UC model calculation for current and SOC are done as said below

Firstly the current consumed is calculated which is fed into a SOC calculation block

* The soc is then calculated based on the amount of current drawn and pushed back into the UC

Hence formula for current is given as

Where

R is the lumped resistance

Vmax is the max voltage

eta is the efficiecncy during the charge discharge cycle

PUC is the power demand which is to supplied by UC and it is there first input in this model which basically comes from enegry management system