EMH-053辅导、讲解Matlab、辅导Matlab语言程序、讲解ISIS留学生

日期：2018-12-06 09:41

PV Assignment – Overview

Submission due date: 13.12.2018 electronically on ISIS and as hard copy in EMH 225 9:45am, AFTER

the lecture. Other submissions are only allowed on Mondays in the consultation hour 4-5pm in

EMH-053.

The submission is performed on ISIS in groups of maximal two students. Two documents are handed

in, a zip file with MATLAB code (Code2018_lastname1_lastname2) and a report in pdf format

(RET2018_lastname1_lastname2). The report includes your names and matriculation number, a brief

description of all PV assignments, an explanation and interpretation of your results, plots, your code

and calculated results. Furthermore, the report needs to be printed in duplex and submitted as hard

copy. The execution of your MATLAB code is conducted in only one m.file called “ExeRet18.m”. All

assignment functions are called sequentially from the m.file “ExeRet18.m” by pressing F5 and

displayed in a convincing and clear way. Exercises that cannot be called from this file are graded with

zero points. Your programmed MATLAB functions are saved in one separate m.file for every single

function.

Assignments:

1. Exercise: Develop a MATLAB function to calculate the position of the sun and Air Mass factor

for Berlin for 4am to 9pm on the 20.12.2018. Plot the results then.

2. Exercise: Develop a MATLAB function that models the described PV module, and hence plot

the voltage-current and voltage-power characteristics of the module under standard test

conditions STC. Set: Rs= 0.002 ?, Rsh = 300 ? and γ = 1.6 (Diode Quality factor)

Shortly describe the impact of the three parameters (Rs, Rsh, γ) on the PV module

performance.

Discuss the effects of increasing and decreasing the temperature and irradiance. Set

S =0.8 kW/m2 and vary T = [0°,20°,35°], set T = 20° and vary S = [0.4, 0.9, 1.5] kw/m2. Plot the

results.

3. Exercise: Given that the module dimensions are 1593*790*50 mm. Calculate the fill factor

and the efficiency of that module under STC using MATLAB.

Write a MATLAB function that can find the possible values of the pure resistive load to be

interfaced to the module keeping it working at the maximum power point MPP for any given

irradiance and temperature conditions. Hence, fill in the following table.

4. Exercise: Develop a MATLAB function that can calculate the percentage power loss under STC

compared to the case of using ideal MPPT for any values of the resistive loads. Subsequently,

fill in the following table:

Load (?) 0 3 7 13 100

Power loss (%)

5. Exercise: Develop a MATLAB function that can perform maximum power point tracking MPPT

through pulse width modulation of a buck-boost converter based on the Hill Climbing

Algorithm assuming a fixed step for voltage change of 1 volt. Converter output voltage is kept

fixed at 30 V. Calculate the duty cycle for the buck-boost converter. Plot the duty cycle D and

Vnew. What should be the starting value for Vi?

6. Exercise: Compare the performance in exercise (5) with the case of a step of 0.2 voltage

change regarding the speed of convergence and accuracy of tracking. Support your

explanation with plots.

7. Exercise: Write a MATLAB function that can perform the Adaptive Hill Climbing Algorithm

and compare tracking speed and accuracy with the previous two exercises. Take as factor C=

[0.1, 0.5, 1]. What is the effect of C? Support your explanation with plots.