Download presentation

Presentation is loading. Please wait.

Published byJarrod Wake Modified over 3 years ago

1
**EGR 272 – Complex Numbers and AC Circuits using MATLAB**

Complex Numbers in MATLAB We will begin this section by looking at several useful functions in MATLAB related to complex numbers. Useful functions in MATLAB related to complex numbers MATLAB function Description Example (MATLAB outputs in red) real(x) Real part of complex number A = 3 + 4i; X = real(A) X = 3 imag(x) Imaginary part of complex number X = imag(A) X = 4 abs(x) Magnitude of a complex number X = abs(3+4i) X = 5 angle(x) Angle of a complex number in radians Alpha = angle(3+4i)*180/pi alpha = conj(x) Complex conjugate of complex number A = 3+4i A = i X = conj(A) X = i

2
**EGR 272 – Complex Numbers and AC Circuits using MATLAB**

Useful functions in MATLAB related to complex numbers MATLAB function Description Example (MATLAB outputs in red) [theta, r] = cart2pol(x, y) Converts from rectangular to polar form where theta is in radians [Radians,Mag]=cart2pol(3,4) Radians = Mag = 5 Degrees=Radians*180/pi Degrees = Note: so 3 + 4i = 553.13 [x, y] = pol2cart(theta, r) Converts from polar to rectangular form where theta is in radians [a,b]=pol2cart(30*pi/180,10) a = b = Note: so 1030 = i complex(a,b) Form complex data from real and imaginary parts X = complex(3,4) X = i A = [3;-3;-3;3]; B = [4;4;-4;-4]; C = complex(A,B) C = i i i i

3
**EGR 272 – Complex Numbers and AC Circuits using MATLAB**

Useful operations in MATLAB related to complex numbers MATLAB operations Description Example (MATLAB outputs in red) Exponentiation(^) Raise a complex number to a power X = (1+2i)^2 X = i Arithmetic operations Addition (+) Subtraction (-) Multiplication (*) Division (/) Converts from polar to rectangular form where theta is in radians A=3+4i; B=2+6i; A+B ans = i A-B ans = i A*B ans = i A/B ans = i Exponential polar form X = 10*exp(30i*pi/180) X = i [Real,Imag]=pol2cart(30*pi/180,10) Real = Imag = Note: So 10ej30 = 1030

4
**EGR 272 – Complex Numbers and AC Circuits using MATLAB**

Printing Complex Numbers in MATLAB Some options for printing complex numbers in MATLAB include: Do not suppress printing and accept the default format (rectangular form): Display using fprintf (not perfect, but may be sufficient in some cases)

5
**EGR 272 – Complex Numbers and AC Circuits using MATLAB**

Printing Complex Numbers in MATLAB Some options for printing complex numbers in MATLAB include: Convert complex number to a string using num2str( ) and print using %s:

6
**EGR 272 – Complex Numbers and AC Circuits using MATLAB**

6 Application of Complex Numbers: AC Circuit Analysis (Phasor Analysis) AC Circuit Analysis Procedure: 1) Draw the phasor circuit (showing voltage and current sources as phasors and using complex impedances for the components). 2) Analyze the circuit in the same way that you might analyze a DC circuit. 3) Convert the final phasor result back to the time domain. Example: Use the total current using phasor analysis by hand. Solution: See next slide

7
**EGR 272 – Complex Numbers and AC Circuits using MATLAB**

Solution: phasor circuit: 500 V 10 30 -j25 -j50 j20 I

8
**EGR 272 – Complex Numbers and AC Circuits using MATLAB**

Example: Use MATLAB to solve for the total phasor current.

Similar presentations

OK

1 ELECTRICAL CIRCUIT ET 201 Define and explain phasors, time and phasor domain, phasor diagram. Analyze circuit by using phasors and complex numbers.

1 ELECTRICAL CIRCUIT ET 201 Define and explain phasors, time and phasor domain, phasor diagram. Analyze circuit by using phasors and complex numbers.

© 2018 SlidePlayer.com Inc.

All rights reserved.

Ads by Google

Ppt on renewable energy source biomass Ppt on transport management system Ppt on windows 8 operating system Ppt on index in oracle Ppt on design and analysis of algorithms Download ppt on layers of atmosphere Ppt on 2nd world war deaths Ppt on trans-siberian railway city Ppt on networking related topics in ict Ppt on 4 types of sentences