A Generalized Voltage Compensation Strategy for Mitigating the Impacts of Voltage Sags/Swells
- 27 June 2005
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Power Delivery
- Vol. 20 (3), 2289-2297
- https://doi.org/10.1109/tpwrd.2005.848442
Abstract
Dynamic restoration of load voltage achieved through the application of voltage-injection technique is considered. The injected voltage is generated from a voltage-source-inverter-based series compensator. It is shown that during a voltage sag, the restoration process almost inevitably requires the injection of energy from the compensator to the external system. Conversely, a voltage swell event could cause the compensator to absorb energy from the external system which would then result in a rise in the dc-link voltage of the inverter. By permitting phase adjustment in the injected voltage, a generalized compensation method is proposed. The new voltage injection technique allows the magnitude of the positive phase-sequence component of the compensated load voltage to be restored to its pre-sag/swell level. It also exercises simultaneous control on the dc-link voltage. The efficacy of the proposed technique is illustrated by numerical examples.Keywords
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