§The frequency of a system is
dependent on active power balance
§As frequency is a common factor throughout the system, a change in active
power demand at one point is reflected throughout the system
§Because there are many
generators supplying power into the system, some means must be provided to
allocate change in demand to the generators
Fspeed governor on each generating unit provides primary speed
control function
Fsupplementary control originating at a central control center
allocates generation
§In an interconnected system,
with two or more independently controlled areas, the generation within each
area has to be controlled so as to maintain scheduled power interchange
§The control of generation
and frequency is commonly known as load
frequency control (LFC) or automatic generation control (AGC)
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