04-05-2012, 02:22 PM
Voltage Stability and Reactive Power Planning
Voltage_Stability_Reactive_Power_Planning_07-08-04(Kolluri) [EDocFind.info].ppt (Size: 249.5 KB / Downloads: 44)
What is Voltage Instability/Collapse
A power system undergoes voltage collapse if post-disturbance voltages are below acceptable limits:
Less than 0.8 PU
voltage collapse may be due to voltage or angular instability
Main factor causing voltage instability is the inability of the power systems to maintain a proper balance of reactive power and voltage control
Possible Solutions forVoltage Issues
Install/Operate Shunt Capacitor Banks
Add dynamic Shunt Compensation in the form of SVC/STATCOM to mitigate transient voltage dips
Add Series Compensation on transmission lines in the problem area
Implement under-voltage load shed (UVLS) program
Construct transmission/generation facilities
Summary
The increasing need to operate the transmission system at its maximum safe transfer limit has become a primary concern at most utilities.
Reactive power supply or VAR management is an important ingredient in maintaining healthy power system voltages and facilitating power transfers.
Inadequate reactive power supply was a major factor in most of the recent blackouts.