T&D World Magazine
Duke Energy Secondary Voltage Control

Duke Energy field crew installs the Gridco Systems’ In-Line Power Regulator on the
system secondary.

A New Way of How: Secondary Voltage Control

Primary voltage level control is too coarse and slow to resolve a new generation of localized, variable voltage disturbances completely.

The distribution system, a key subset of the overall electric grid, provides power to residential, commercial and industrial customers. Voltage and reactive power management and control have been done traditionally from the primary side by using substation transformers with load-tap changers (LTCs), voltage regulators and capacitor banks. In recent years, advanced distribution applications such as conservation voltage reduction (CVR) — implemented to achieve demand and energy reduction by

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