1. Voltage Collapse In Wind Power System Yuhan Zhang UNI: yz2500 ELEN E9501 Presentation

2. 1.Why There Will Occur Voltage Collapse2. What the Researchers Done on This Topic3.My Idea Came From? 4. Introduce the Model5. The Cases I Focus On

3. 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

4. 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

5. Keep zs and power factor constant |zs/zld|=1=>Pmax

6. P-V curve

7. 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.

8. 3. My idea came from? Wind power is out of control— voltage stability is threatened Existed power grid problem Smart grid Renewable energy sources Wind power advantages Disadvantages are significant

9. 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

10. 4. Introduce the model I use Dependent on: 1.Pout 2.Qout 3.Rline, Xline … Zs=Rs+jXs Zld=Rld+jXld First step: a simplified model

11. 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).

12. 5. The cases I focus on Use the prediction data to analyze Use the actual data to analyze Compare the two sets of data

13. Thank You! Yuhan Zhang UNI: yz2500 ELEN E9501 Presentation