Title: TW 16
1TW 1617 Synchronous Machine
- Construction
- Principle
- Characteristics
- Selection criterias
- Equivalent circuit
- Calculation on the basis of equivalent circuit
2TW16.0-16.6 Components
3TW16.0-16.6 Components
4TW16.0-16.6 Components
5TW16.0-16.6 Components
6TW16.0-16.6 Components
7TW16.0-16.6 Components
8TW16.0-16.6 Components
9TW16.0-16.6 Components
10TW16.0-16.6 Components
11TW16.0-16.6 Components
12TW16.0-16.6 Components
13TW16.0-16.6 Components
14TW16.7 Size Factors
- Small machines lower efficiencies
- Big machines better efficiencies
- 1000MW generator almost 99!!!
- Think again of magnetics and scale rules
- Therefore rather one big machine than more
smaller machines - 1 efficiency thousands of per day in power
plant!!!
15TW16.89 Principle
- Synchronous machine is uncommutated dc machine
inside out - Stator is equal to asynchronous motor stator
- Rotating field is therefor the same
- No slip, but elastic, magnetic coupling between
rotor and revolving field
16TW16.89 Principle
17TW16.89 Principle
18TW16.89 Principle
19TW16.91011 Equivalent Circuit
20TW16.91011 Equivalent Circuit
21TW16.12-14 Machine under Load
22TW16.12-14 Machine under Load
23TW16.12-14 Machine under Load
24TW16.12-14 Machine under Load
25TW16.12-14 Machine under Load
26TW16.15 Synchronization
- 1) Generator frequency bus frequency
- 2) Generator voltage bus voltage
- 3) Phase generator phase bus
- 4) Phase sequence generator phase
- sequence bus
27TW16.15 Synchronization
28TW16.16-18 Infinite Bus
- Infinite bus is a power supply where frequency
and amplitude are constant under all load
conditions - The public electricity grid is an infinite bus
feeding power into it by an ac generator does not
increase the frequency or voltage.
29TW16.16-18 Infinite Bus
30TW16.16-18 Infinite Bus
31TW16.19 Torque Angle Torque
32TW16.19 Torque Angle Torque
33TW16.20 Active Power
34TW16.23 Active Power
35TW16.20 Active Power
36TW16.21 Control Active Power
- More power only more torque
- More torque more fuel per cycle
- Synchronous machine on infinite bus so no speed
variations! - Speed variations only possible when machine in
island mode
37TW16.22 Transient Reactance
- Sudden load changes give much lower synchronous
reactance - Steady state has the usual reactance
- Large machines need up to 10 secs to reach normal
Xs after transients! - Good for voltage regulation at transients
- Bad for circuit breakage high current
38TW16.24 Machine Efficiency
- Check Magnetics chapters again and the note about
scaling laws! - The bigger the machines, the higher the
efficiency. - 16.24 is an example of the explained scaling laws
in the magnetics lectures.
39TW17 Synchronous Motors
40TW17.23 Motor Start Up
- Squirrel cage winding
- Start up with external motor
- Pull in torque rotor synchronizes with stator
field
41TW17.4-7 Motor Under Load
42TW17.4-7 Motor Under Load
43TW17.4-7 Motor Under Load
44TW17.4-7 Motor Under Load
45TW17.8 Reluctance Torque
46TW17.8 Reluctance Torque
47TW17.8 Reluctance Torque
48TW17.8 Reluctance Torque
49TW17.8 Reluctance Torque