Systems and methods using collaborative controls to maintain unintentional islanding standards

DWPI Title: Direct current (DC) to alternating current (AC) inverter for providing unintentional islanding conformance, has unintentional islanding controls use frequency and voltage as determined from phase-locked loop while grid support function
Abstract: The present invention relates to systems and methods that use separation of time scales to mitigate interaction between unintentional islanding detection schemes and GSFs.
Use: Direct current (DC) to alternating current (AC) inverter for providing unintentional islanding conformance.
Advantage: The collaborative grid support function allow inverters to tolerate large deviations in voltage and frequency and to provide negative feedback to help mitigate deviations in voltage and frequency.
Novelty: The inverter (204) has the grid support functions that are selected from the group consisting of volt or Variance ratio, frequency or watt ratio and limits on voltage and frequency. The collaborative controls module (218) comprises the filters that separate the grid support function controls and unintentional islanding controls into different time regimes or control bandwidths. The unintentional islanding controls use frequency and voltage as determined from the phase-locked loop while the grid support function controls respond to filtered values of voltage and frequency measurements of the unintentional islanding controls such that one harmonized signal is sent from the DC/AC inverter to a power controller that accomplishes both unintentional islanding and grid support functions.
Filed: 3/20/2018
Application Number: US15926971A
Tech ID: SD 13555.1
This invention was made with Government support under Contract No. DE-NA0003525 awarded by the United States Department of Energy/National Nuclear Security Administration. The Government has certain rights in the invention.
Data from Derwent World Patents Index, provided by Clarivate
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