Theseries Controllercould be a variable
impedance,such ascapacitor,reactor,etc., or a power electronics based variable source
of main frequency, subsynchronous and harmonic frequencies (or a combination) to
serve the desired need.In principle,all series Controllers inject voltage in series with
the line.Even a variable impedance multiplied by the current flow through it,represents
an injected series voltage in the line. As long as the voltage is in phase quadrature
with the line current,the series Controller only supplies or consumes variable reactive
power.Any other phase relationship will involve handling of real power as well.
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