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).
Claims19
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 (Vc) at the AC terminals that reduces an AC line-to-line fault current (If), wherein the fault reducing voltage (Vc) is determined using the following equation:
- Vc=Emc−Zc/ZmEmm,
- where:
- Emc is a fault voltage outside of the AC source;
- Emm is an internal voltage or back EMF of the AC source;
- Zc is an electrical converter side impedance;
- and
- Zm is an electrical machine side impedance.
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 (Vc) at the AC terminals that reduces the AC line-to-line fault current (If), wherein the fault reducing voltage (Vc) is determined using the following equation:
- Vc=Emc−Zc/ZmEmm,
- where:
- Emc is a fault voltage outside of the AC source;
- Emm is an internal voltage or back EMF of the AC source;
- Zc is an electrical converter side impedance;
- and
- Zm is an electrical machine side impedance.
Dependencies are inferred from the claim text.