Closed-Loop Buck-Boost Converter Modeling & Simulation

Based on the previous submissions uploaded;
1) DC-DC Converters Using Mathematical Methods:
http://www.mathworks.com/matlabcentral/fileexchange/54362-dc-dc-converters-using-mathematical-methods
2) DC-DC Converters Using Circuitry Method:
http://www.mathworks.com/matlabcentral/fileexchange/54360-dc-dc-converters-using-circuitry-method
The submissions listed above are the modeling and simulation of the DC-DC converters in the open-loop scheme. This submission here, named Closed-Loop Buck-Boost Converter Models, outlines the modeling and simulation of buck-boost converter in the closed-loop scheme with the control of the PID Controller.