Join 60,000+ competitive exam aspirants
or with email
Your Cart
SubtotalтВ╣0
TotalтВ╣0
Examoogle тАв User тАв info@examoogle.com тАв EE-2024-8821
Chapter 1 of 12 тАв Page 1 of 248ЁЯФТ Protected PDF тАв Watermarked
Join 60,000+ competitive exam aspirants
In Distributed generation power quality is?
Increased
Reduced
Remains same
First increase then decrease
Reduced
Integrating Distributed Generation (DG) units into a radial distribution network often leads to a degradation in power quality metrics such as voltage regulation, harmonic content, and flicker. This occurs primarily because distribution networks are designed for unidirectional power flow, and the intermittent nature of many DGs (like solar/wind) introduces fluctuations and bidirectional current flow.
Integrating Distributed Generation (DG) units into a radial distribution network often leads to a degradation in power quality metrics such as voltage regulation, harmonic content, and flicker. This occurs primarily because distribution networks are designed for unidirectional power flow, and the intermittent nature of many DGs (like solar/wind) introduces fluctuations and bidirectional current flow.
THD=I1тАЛтИСh=2тИЮтАЛIh2тАЛтАЛтАЛ├Ч100% тАФ Total Harmonic Distortion calculation which typically increases with non-linear DG inverters.
╬ФVтЙИRpтАЛ+Xq тАФ Voltage variation caused by active power (p) and reactive power (q) injection from DG units.
In traditional distribution feeders, power flow is unidirectional from substation to load. When DG is introduced, the injection of current creates a voltage rise along the feeder, potentially exceeding statutory limits. Furthermore, the use of power electronic inverters in DG units injects non-linear harmonics and creates high dv/dt transients, which significantly increases THD (Total Harmonic Distortion) and reduces the overall power quality of the grid segment.
DG units can lead to bidirectional power flow, which compromises legacy protection schemes.
Inverters in DG units are significant sources of harmonics in distribution feeders.
Improper placement and sizing of DG can increase voltage variations at the point of common coupling (PCC).
Power quality improvement requires advanced control strategies like Active Power Filters (APF).
Reduced transmission losses due to proximity to load
Enhanced reliability if islanding is managed correctly
Reduction in peak demand on transmission infrastructure
Increased harmonic distortion (THD)
Voltage instability and regulation issues
Protection coordination challenges
Complexity in fault detection
Microgrid development
Remote village electrification
Industrial peak shaving
Standard power quality refers to voltage stability, frequency stability, and harmonic levels.
Option A is incorrect because DG does not automatically improve power quality without mitigation techniques.
Option C is incorrect because the integration of active power and non-linear loads inherently alters the feeder's electrical environment.
B is correct тАФ Distributed generation, especially when using power electronics, introduces harmonics and voltage variations that typically result in reduced power quality at the point of common coupling.
Always remember that while DG reduces technical losses in the network, it creates new challenges for power quality management; distinguish between 'power efficiency' and 'power quality' to avoid confusion.