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US 2026/0261127 A1Published application
Method of transient-free transformer energization and black start using inverter based resources
AssigneeThe Florida State University Research Foundation, Inc.
InventorsYuan Li, Fang Peng
Life of this patent
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Abstract
Systems and methods for energizing transformers with inverter-based resources (IBRs) are provided. IBRs can pick up local critical loads after blackout and ultimately support the bulk power system recovery. The transformer energization process can be achieved by controlling IBRs without any inrush current, and the duration of the process can be instant or essentially instant.
Claims20
A method for energizing a transformer with inverter-based resources (IBRs), the method comprising:
- regulating a current of an inverter of the transformer to zero via a switching-cycle-based direct current (DC) feedback loop with an input current of zero;
- generating an estimate of a remanent flux in the transformer using samples of the current of the inverter, a DC voltage of the inverter, and an inverter switching function;
- determining an initial voltage phase angle of the inverter based on the estimated remanent flux in the transformer;
- and
- starting the inverter with the initial voltage phase angle of the inverter.
2 more elements
A system for energizing a transformer with inverter-based resources (IBRs), the system comprising:
- a processor;
- and
- a machine-readable medium in operable communication with the processor and an inverter of the transformer and having instructions stored thereon that, when executed by the processor, perform the following steps:
- regulating a current of the inverter of the transformer to zero via a switching-cycle-based direct current (DC) feedback loop with an input current of zero;
- generating an estimate of a remanent flux in the transformer using samples of the current of the inverter, a DC voltage of the inverter, and an inverter switching function;
- determining an initial voltage phase angle of the inverter based on the estimated remanent flux in the transformer;
- and
- starting the inverter with the initial voltage phase angle of the inverter.
5 more elements
Dependencies are inferred from the claim text.