Transcript Silverlight Briefing

ELEN E9501 Presentation
Voltage
Collapse
In Wind Power System
Yuhan Zhang
UNI: yz2500
1.Why There Will Occur Voltage Collapse
2. What the Researchers Done on This Topic
3.My Idea Came From?
4. Introduce the Model
5. The Cases I Focus On
1.Why there will occur Voltage Collapse
Violation of voltage limits and undesirable line outages are leading power systems
to voltage instability and ultimately to voltage collapse. Sudden load increases or
Insufficient reactive power supplies may also contribute to voltage collapse and
Blackouts.
Voltage collapse or blackouts have occurred worldwide:
France 1978
Belgium 1982
Florida USA 1985
Western France 1987
Southern Finland 1992
Northeast USA 2003
Italy, England 2003
1.Why there will occur Voltage Collapse
Northeast Blackout – August 14, 2003
• Affected 55 million people
• $6 billion lost
• Per year $135 billions lost
for power interruption
1.Why there will occur Voltage Collapse
E2
V=
2
1+
zs
z
+ 2 s cos(q - j )
zLD
zLD
V2
P=
cosj
zLD
Keep zs and power factor constant
|zs/zld|=1=>Pmax
P-V curve
2. What the researchers done on this topic
Analyze the reason why the voltage collapse
Try to find the accurate voltage collapse point
Static analysis
Dynamic analysis
It’s a really brief conclusion about what others have done. In the following
presentation, I will focus on what I have done and what I will do.
3. My idea came from?
Renewable
energy sources
Wind power
Smart grid
advantages
Wind power is
out of control—
voltage stability
is threatened
Existed power
Disadvantages
grid problem
are significant
3. My idea came from?
Although wind power cannot be controlled, we can do the prediction based on
the history data and the weather report. Hence we can use the prediction data
to analyze the next hour/day power and voltage distribution. It is helpful to the
power grid dispatching.
Voltage Collapse In Wind Power System
4. Introduce the model I use
First step: a simplified model
Dependent on:
1.Pout
2.Qout
3.Rline, Xline
…
Zld=Rld+jXld
Zs=Rs+jXs
E = Vwind _ farm -
Pout × R + Qout × X
P × X - Qout × R
- j out
Vwind _ farm
Vwind _ farm
E2
V=
2
1+
zs
z
+ 2 s cos(q - j )
zLD
zLD
V2
P=
cosj
zLD
4. Introduce the model I use
Second step: a more complex model
PQ nodes (#1, #2, #3, #4 and #5);
PV nodes( Generator set #6, #7, #8);
Equilibrium node (#9).
5. The cases I focus on
Use the prediction data to analyze
Use the actual data to analyze
Compare the two sets of data
ELEN E9501 Presentation
Thank You!
Yuhan Zhang
UNI: yz2500