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
At normal operation, a converter consumes the reactive power in an amount that corresponds to ___________ of transmitted active power.
Approximately 20%
Approximately 40%
Approximately 50%
Approximately 60%
Approximately 50%
In HVDC transmission systems, the line-commutated converter (LCC) consumes reactive power proportional to the real power being transmitted. At normal operating conditions, this reactive power demand is approximately 50% to 60% of the active power rating.
In HVDC transmission systems, the line-commutated converter (LCC) consumes reactive power proportional to the real power being transmitted. At normal operating conditions, this reactive power demand is approximately 50% to 60% of the active power rating.
Q=PтЛЕtan(╧Х) тАФ Relationship between reactive power and active power based on converter power factor angle
QтЙИ0.5P тАФ Empirical estimation for normal HVDC converter operation
The reactive power consumption is an inherent characteristic of phase-controlled converters, necessitated by the commutation process. The converter draws lagging reactive power to support the firing angle delay (╬▒) and commutation overlap angle (╬╝). As the firing angle increases to regulate DC voltage, the reactive power demand significantly increases, leading to a baseline consumption of roughly 50% of the transmitted active power (P).
Converters in HVDC systems do not generate reactive power; they consume it.
The reactive power demand is load-dependent and increases with the delay angle ╬▒.
Filter banks and capacitor banks are mandatory at HVDC converter stations to supply this reactive power.
Poor power factor control at the converter leads to high reactive power demand, stressing the AC network.
Enables precise control of power flow in DC links.
Allows independent control of active power transmission.
Requires large investment in AC filters and shunt capacitors.
Increases AC voltage regulation issues near converter stations.
HVDC converter station design.
Stability analysis of AC-DC interconnected power systems.
The reactive power consumption is defined as Q=Ptan(╧Х), where ╧Х is the displacement angle.
At rated load, typical values hover between 50% and 60% of the active power P.
C is correct тАФ HVDC converters act as reactive power sinks, typically consuming reactive power equivalent to about 50% of the transmitted real power.
Always remember that in power electronics converters (LCC), the firing angle ╬▒ is the primary cause of reactive power consumption; larger ╬▒ results in lower power factor and higher reactive power demand.