Improving Power Quality Using Distribution Design
-
Upload
imtiyaz-alam -
Category
Documents
-
view
140 -
download
0
Transcript of Improving Power Quality Using Distribution Design
Technical Seminar Presentation
December 24, 2004 [1/12]
IMPROVING POWER QUALITY USING DISTRIBUTION DESIGN
Presented By:
AMIT KUMAR ROLL NO. EE200118062
Under guidance of MR. DEBASIS JENA
Instructor
Technical Seminar Presentation
AMIT KUMAR # EE200118062 [2/12]
•power quality Is the physical characteristics of the electrical supply provided under normal operating conditions that do not disrupt or disturb the customer’s processes .
• quality of power supply implies basically voltage quality and supply reliability.
• power quality issues is an increasingly important factor to consider in
order to satisfy good productivity
POWER QUALITY- Introduction
.
Technical Seminar Presentation
AMIT KUMAR # EE200118062 [3/12]
• LONG-DURATION VARIATIONS: Rms deviations at power frequencies for longer than one minute.
. Long-duration variations can be caused by: -
- Improper voltage regulation
- Broken neutral
- Utility-initiated voltage reduction
- Sudden change of load or unusual load on a distribution circuit
VOLTAGE REGULATION VARIATION
.
Technical Seminar Presentation
AMIT KUMAR # EE200118062 [4/12]
•power quality problem exists if any voltage, current or frequency deviation results in a failure or in a bad operation of customer’s equipment
•Natural phenomena, such as lightning are the most frequent cause of power quality problems.
• Switching phenomena resulting in oscillatory transients in the electrical supply
•Short-term voltage drops (sags) can trip electrical drives or more sensitive equipment, leading to costly interruptions of production
POWER QUALITY IN POWER DISTRIBUTION SYSTEMS
.
Technical Seminar Presentation
AMIT KUMAR # EE200118062 [5/12]
There are two approaches • LOAD CONDITIONING - ensures that the equipment is less sensitive to
power disturbances, allowing the operation even under significant voltage distortion
• INSTALL LINE CONDITIONING SYSTEMS -suppress or counteracts the power system disturbances
A flexible and versatile solution to voltage quality problems is also offered by active power filters
SOLUTIONS TO POWER QUALITY PROBLEMS
.
Technical Seminar Presentation
AMIT KUMAR # EE200118062 6[2/12]
TWO TYPES:-
1.SERIES ACTIVE POWER FILTER- operates as a controllable voltage source
2.SHUNT ACTIVE POWER FILTER-operate as a controllable current source
Both schemes are implemented preferable with voltage source PWM inverters, with a dc bus having a reactive element such as a capacitor.
ACTIVE POWER FILTERS
.
Technical Seminar Presentation
AMIT KUMAR # EE200118062 [9/12]
FACTS are designed to :
1.attaining an increase of power transmission capacity at optimum conditions, i.e. at maximum availability, minimum transmission losses .
2. Improving or safeguarding of power quality in transmission and distribution
FACTS offer remedy , by enabling confinement or neutralizing of electrical disturbances such as:-
• voltage sags • fluctuations• harmonic distortion• phase unbalance
FACTS IS THE TERMINOLOGY USED IN THE INDUSTRY
.
Technical Seminar Presentation
AMIT KUMAR # EE200118062 [10/12]
The Different FACT Devices are:
• SVC (Static Var Compensators)
• TCSC(Thyristor-Controlled Series Capacitors)
• STATCOM
• PST (Phase-shifting Transformers),
• IPC (Interphase Power Controllers)
• UPFC (Universal Power Flow Controllers)
• DVR (Dynamic Voltage Restorers).
FACT DEVICES
.
Technical Seminar Presentation
AMIT KUMAR # EE200118062 [11/12]
Current-limiting fuses is used to provide high-speed protection of low voltage and medium-voltage power systems.
CURRENT-LIMITING FUSES IMPROVE POWER QUALITY
.
Technical Seminar Presentation
AMIT KUMAR # EE200118062 [12/12]
Current-limiting fuses provide protection against disruptive heating and electromagnetic effects,but also make an important contribution to the improvement of power quality.
FACTS solutions will be particularly justifiable in applications requiring one or more of the following qualities:
-Rapid dynamic response-Ability for frequent variations in output-Smoothly adjustable output.
CONCLUSION
.
!! THANK YOU !!