Principle of Operation of Brushless AC Generator

Star connected 3-phase AC generator

UNIT 13 MODERN ELECTRICAL POWER

GENERATION TYPES

AIM OF THE UNIT:- to understand modern electrical power generation

types

TASKS

1 Do your best to answer the brainstorming question. 2 Read the text for general understanding.

3 Make up questions to the text. 4 Find the sentences with the new words in the text. Give the Kazakh or Russian

equivalents of the words.

5 Write sentences with the new vocabulary. 6 Make up exercises as in the UNIT 2 (Master`s degree students individual work withthe teacher) page 210 (exercises for better remembering the topic). 7 Speak on the topic. Given schemes will help you to remember and understand

the topic.

8 Find more information about the topic and make up a project work on the topic.

 

The DCsystem is limited by currents greater than 400 A and the constant frequency AC method using an Integrated Drive Generator (IDG) has been mentioned. In fact there are many more power generation types in use today. A number of recent papers have identified the issues and projected the growth in aircraft electric power requirements in a civil aircraft setting, even without the advent of more-electric systems. However not only are aircraft electrical system power levels increasing but the diversity of primary power generation types is increasing. The Constant Frequency (CF) 115 VAC, three-phase, 400 Hz options are typified by the Integrated Drive Generator (IDG), variable speed constant frequency (VSCF) cycloconverter and DC link options. Variable frequency (VF) 115 VAC, three phase power generation – sometimes termed ‘frequency-wild’ – is also a more recent contender, and although a relatively inexpensive form of power generation, it has the disadvantage that some motor loads may require motor controllers. Military aircraft in the US are inclining toward 270 VDC systems. Permanent Magnet Generators (PMGs) are used to generate 28 VDC emergency electrical power for high-integrity systems. Without being drawn into the partisan arguments regarding the pros and cons of the major types of power generation in use or being introduced today it is worth examining the main contenders:

Ø Constant frequency using an IDG

Ø Variable frequency

Ø Variable Speed Constant Frequency (VSCF) options

 

Electrical Power Generation Types