The series Controller could be a variableimpedance,such ascapacitor,reactor,etc., or a power electronics based variable sourceof main frequency, subsynchronous and harmonic frequencies (or a combination) toserve the desired need.In principle,all series Controllers inject voltage in series withthe line.Even a variable impedance multiplied by the current flow through it,representsan injected series voltage in the line. As long as the voltage is in phase quadraturewith the line current,the series Controller only supplies or consumes variable reactivepower.Any other phase relationship will involve handling of real power as well.
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