Voltage control in an electrical power system is
important for proper operation for electrical power equipment to prevent damage
such as overheating of generators and motors, to reduce transmission losses and
to maintain the ability of the system to withstand and prevent voltage
collapse. In general terms, decreasing reactive power causes voltage to fall
while increasing it causes voltage to rise (Kundur, 2014).
important for proper operation for electrical power equipment to prevent damage
such as overheating of generators and motors, to reduce transmission losses and
to maintain the ability of the system to withstand and prevent voltage
collapse. In general terms, decreasing reactive power causes voltage to fall
while increasing it causes voltage to rise (Kundur, 2014).
A voltage collapse occurs when the system try to
serve much more load than the voltage can support. When reactive power supply
lower voltage, as voltage drops current must increase to maintain power
supplied, causing system to consume more reactive power and the voltage drops
further . If the current increases too much, transmission lines go offline, overloading
other lines and potentially causing cascading failures. If the voltage drops
too low, some generators will disconnect automatically to protect themselves.
Voltage collapse occurs when an increase in load or less generation or
transmission facilities causes dropping voltage, which causes a further
reduction in reactive power from capacitor and line charging, and still there
further voltage reductions. If voltage reduction continues, these will cause
additional elements to trip, leading further reduction in voltage and loss of
the load. The result in these entire progressive and uncontrollable declines in
voltage is that the system unable to provide the reactive power required supplying
the reactive power demands (Xu, Zhang, da Silva & Kundur, 2008).
serve much more load than the voltage can support. When reactive power supply
lower voltage, as voltage drops current must increase to maintain power
supplied, causing system to consume more reactive power and the voltage drops
further . If the current increases too much, transmission lines go offline, overloading
other lines and potentially causing cascading failures. If the voltage drops
too low, some generators will disconnect automatically to protect themselves.
Voltage collapse occurs when an increase in load or less generation or
transmission facilities causes dropping voltage, which causes a further
reduction in reactive power from capacitor and line charging, and still there
further voltage reductions. If voltage reduction continues, these will cause
additional elements to trip, leading further reduction in voltage and loss of
the load. The result in these entire progressive and uncontrollable declines in
voltage is that the system unable to provide the reactive power required supplying
the reactive power demands (Xu, Zhang, da Silva & Kundur, 2008).
