Fault current mitigation for an electrical power conversion system
AssigneesGeneral Electric Company, General Electric Deutschland Holding GmbH
InventorsHridya Ittamveettil, Kum Kang Huh, Vandana Prabhakar Rallabandi, Di Pan, Rajib Datta, Mohamed Osama
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Abstract
An electric power conversion system comprising: an alternating current (AC) source comprising a plurality of AC terminals for conducting AC power; a voltage source electrically coupled to the AC terminals; and a controller operably coupled to the voltage source, the controller being configured to: operate the voltage source to apply a fault reducing voltage at the AC terminals that reduces an AC line-to-line fault current (If).
Claims17
An electric power conversion system comprising:
- an alternating current (AC) source comprising a plurality of AC terminals for conducting AC power;
- a voltage source electrically coupled to the AC terminals;
- and
- a controller operably coupled to the voltage source, the controller being configured to:
- operate the voltage source to apply a fault reducing voltage at the AC terminals that is of opposite polarity of an AC source output voltage at a fault location such that a line-line voltage at the fault location is reduced;
- wherein the fault reducing voltage is a positive sequence voltage and a negative sequence voltage, and
- wherein the voltage source regulates a ratio of the negative sequence voltage to positive sequence voltage (μ) and a phase angle (β) between the positive sequence voltage and the negative sequence voltage.
A method of operating an electric power conversion system, the electric power conversion system comprising an alternating current (AC) source comprising a plurality of AC terminals for conducting AC power and a voltage source electrically coupled to the AC terminals, the method comprising:
- measuring an AC line-to-line fault current (If) conducted through the AC link of the power converter;
- and
- operating the voltage source to apply a fault reducing voltage at the AC terminals that is of opposite polarity of an AC source output voltage at a fault location such that a line-line voltage at the fault location is reduced;
- wherein the fault reducing voltage is a positive sequence voltage and a negative sequence voltage, and
- wherein the voltage source regulates a ratio of the negative sequence voltage to positive sequence voltage (μ) and a phase angle (β) between the positive sequence voltage and the negative sequence voltage.
Dependencies are inferred from the claim text.