Download presentation

Presentation is loading. Please wait.

Published byMarcella Mixson Modified over 2 years ago

1
**Lecture 32 Review: AC power analysis Power factor correction**

Average power, complex power, power triangles RMS values Power factor Power factor correction Related educational modules: Section 2.9.1, 2.9.2

2
**AC power analysis Average power:**

Average power in terms of RMS (or effective) values: Complex power:

3
**Power triangles Complex power (rectangular form):**

Real (average) and reactive power: Presented graphically:

4
Power factor (pf) Power factor: Load impedance:

5
**Example 1 For the circuit below, determine:**

(a) the complex power delivered by the source (b) the average power delivered by the source

6
**Outline problem on previous slide:**

1. find equivalent impedance 2. find source current 3. complex power = VI*/2 4. Average power = (Vm*Im/2)*cos(thetav-thetai)

7
**(a) Determine the complex power delivered by the source**

8
**(b) Determine the average power delivered by the source**

9
**Effect of pf on power delivery**

If v - i 0, we have some reactive power that is not consumed by the load The current provided to the load is higher than necessary Results in additional power dissipated during delivery Power companies don’t like this!

10
**Power factor correction**

Power companies may require that users maintain a minimum power factor e.g. pf > 0.9 Most large loads are inductive in nature e.g. inductive motors Power factor correction may be necessary The approach must be inexpensive & simple to implement Adding a capacitor in parallel with the inductive load will increase the power factor

11
**Power factor correction – continued**

We have an inductive load with some power factor cos1: The power triangle is shown below:

12
**Power factor correction – continued again**

We can increase the power factor by adding a capacitor in parallel with the load: The power triangle then becomes:

13
**Example 2 – power factor correction**

For the circuit below if (a) Determine the power factor (b) Re-design the circuit so that pf = 1

14
Example 2 – Determine pf

15
**Example 2 – Re-design circuit so that pf = 1**

Similar presentations

OK

Complex power. It is a standard practice to represent S, P, and Q in the form of a triangle, known as the power triangle, shown in Fig. (a). This.

Complex power. It is a standard practice to represent S, P, and Q in the form of a triangle, known as the power triangle, shown in Fig. (a). This.

© 2017 SlidePlayer.com Inc.

All rights reserved.

Ads by Google

Download ppt on resources and development Raster scan and random scan display ppt on tv Ppt on fire extinguisher types colors Ppt on crop production and management Ppt on amplitude shift keying generator Micro display ppt on tv Ppt on effective business communication Ppt on limitation act alberta Ppt on world ozone day Ppt on review writing job