Bloom Energy Corporation

Vishal A Gopalakrishnan

Ranganathan Gurunathan

Chaitanya Mandela

Prasad Pmsvvsv

Ponkiran Ponnappan

Saravana Narayanasamy

Ayyapparudrasimha Yedida

Badrinarayanan Thiruvengadaswamy

Systems and methods for synchronization of microgrid inverters in a microgrid are disclosed. The system includes a microgrid and a master inverter. The master inverter is operatively connected to a main grid and a plurality of microgrid inverters of the microgrid. The master inverter determines one or more electrical parameters for the main grid and the microgrid. The system detects one or more predefined fault conditions in at least one of the microgrid and the main grid based, at least in part, on the one or more electrical parameters. In response to detection of the one or more predefined conditions, the system generates a synchronization signal including at least a voltage reference to be maintained at a microgrid bus. The master inverter then transmits a synchronization signal that operates to match a voltage at the microgrid bus with the voltage reference comprised in the synchronization signal.

Systems and methods for synchronization of inverters in a microgrid

An auxiliary circuit to inject fault current to a grid is provided. The circuit includes a pair of transformers including a first transformer and a second transformer, and a pair of SCRs including a first SCR and a second SCR. Each SCR remains in an OFF state and an ON state when AC voltage of the grid is in normal range and fault range, respectively. The circuit includes a capacitor electrically connected between the first transformer, the second transformer, and the first SCR. The circuit includes a diode biased by the second transformer and the capacitor to enable charging of the capacitor to a peak of AC voltage during one polarity of AC voltage when the AC voltage is in normal range. The capacitor discharges via the first SCR and the first transformer by injecting the fault current into the grid when the AC voltage is in the fault range.

Auxiliary circuit to inject fault current during grid faults

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San Jose, CA, United States of America

Vishal A Gopalakrishnan