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Chapter 1 of 12 тАв Page 1 of 248ЁЯФТ Protected PDF тАв Watermarked
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The transfer of reactive power over a line mainly depends upon
VrтАЛ
VsтАЛ
VsтАЛтИТVrтАЛ
Power angle
VsтАЛтИТVrтАЛ
Reactive power transfer (Q) over a transmission line is primarily driven by the difference in voltage magnitudes between the sending end (VsтАЛ) and the receiving end (VrтАЛ). In a short line model, the flow of reactive power is approximately proportional to the voltage drop across the line reactance.
Reactive power transfer (Q) over a transmission line is primarily driven by the difference in voltage magnitudes between the sending end (VsтАЛ) and the receiving end (VrтАЛ). In a short line model, the flow of reactive power is approximately proportional to the voltage drop across the line reactance.
QтЙИXVrтАЛ(VsтАЛтИТVrтАЛ)тАЛ тАФ Reactive power flow in terms of voltage magnitude difference
PтЙИXVsтАЛVrтАЛтАЛsin╬┤ тАФ Real power flow in terms of power angle ╬┤
The reactive power flow (Q) is governed by the reactive power-voltage relationship QтЙИXVrтАЛтАЛ(VsтАЛтИТVrтАЛ). Since the transmission line possesses inductive reactance (X), a potential difference (VsтАЛтИТVrтАЛ) acts as the driving force for reactive power migration to support voltage regulation.
Reactive power is voltage-dependent, while real power is primarily angle-dependent.
A higher VsтАЛ relative to VrтАЛ forces reactive power from the source toward the load.
If VrтАЛ>VsтАЛ, reactive power flows from the receiving end back to the source.
This principle is the basis for voltage control using shunt compensation.
Provides a simple mechanism to control local bus voltage.
Allows reactive support through SVCs (Static Var Compensators).
High reactive power flow increases I2R and I2X losses.
Excessive voltage difference can lead to stability issues.
Voltage profile management in power grids.
Coordination of shunt capacitors and reactors.
Option D (Power angle) is the primary factor for active power (P) transfer.
Voltage stability is directly tied to the ability to supply sufficient reactive power to maintain the VsтАЛтИТVrтАЛ balance.
C is correct тАФ The transfer of reactive power in transmission lines is primarily driven by the magnitude difference between sending and receiving end voltages (VsтАЛтИТVrтАЛ).
Remember: P (Active Power) depends on sin╬┤ (the power angle), whereas Q (Reactive Power) depends on ╬ФV (the voltage magnitude difference).