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The terminal voltage of an alternator can be given as V = E - IZ. As the load current, and hence the armature current, increases, voltage drop in the armature also increases. The field current must be increased to compensate this voltage drop, such that the terminal voltage is at the target value.
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Voltage fluctuations can be described as repetitive or random variations of the voltage envelope due to sudden changes in the real and reactive power drawn by a load. The characteristics of voltage fluctuations depend on the load type and size and the power system capacity.
Aug 23, 2022 · The variation of load demand generally leads to slow dynamics, whereas a generator tripping produces an instantaneous drop, which may be quite large if the power system lacks buses with constant voltage. As a power system has many means to provide reactive reserves and to sustain voltage, a coordinated use of these means is suitable.
Voltage Fluctuations. Long Duration Voltage Variations: It is defined as “Long-duration variations encompass root-mean-square (rms) deviations at power frequencies for longer than 1 min.” ANSI C84.1 specifies the steady-state voltage tolerances expected on a power system.
Oct 15, 2020 · Frequency variations in a power system occur because of an imbalance between generation and load. When the frequency value of a power system reaches the emergency condition, the control strategy is initiated. The frequency control is divided in three levels: primary, secondary and tertiary controls.
Jan 12, 2017 · A power system at a given operating state is voltage stable if on being subjected to a certain disturbance, the voltages near loads approach the post-disturbance equilibrium values. The concept of voltage stability is related to transient stability of a power system.
The following are the methods used in the power system for controlling the voltage. On – Load Tap Changing Transformer. Off – Load Tap Changing transformer. Shunt Reactors. Synchronous Phase Modifiers. Shunt Capacitor. Static VAR System (SVS) Controlling the system voltage by the help of shunt inductive element is known as shunt compensation.
