Now showing items 1-6 of 6
Use of PLL stability for islanding detection
(United States Patent and Trademark Office, 2014-09-02)
A phase detector for a phase-locked loop includes a phase detector that is configured to become unstable, oscillate and drift rapidly in frequency in a predictable manner when a reference frequency signal is not available. ...
Method of evaluating and ensuring stability of AC/DC power systems
(United States Patent and Trademark Office, 2015-09-15)
Approximating loci of eigenvalues or characteristic gains of a return ratio matrix of a model of a multi-phase power converter circuit by the loci of the d-d and q-q elements of said synchronous frame of reference applied ...
DC-side leakage current reduction for single phase full-bridge power converter/inverter
(United States Patent and Trademark Office, 2015-06-02)
Leakage current through stray or parasitic capacitance (which is particularly large in devices such as photovoltaic cell arrays and which are damaged by such leakage currents) due to common mode switching noise in a full ...
Algorithm and implementation system for measuring impedance in the D-Q domain
(United States Patent and Trademark Office, 2015-09-22)
A controller and infrastructure for an impedance analyzer measures responses to perturbations to respective phases of a multi-phase system at an interface between stages thereof (which may be considered as a source and ...
Three-level active neutral point clamped zero voltage switching converter
(United States Patent and Trademark Office, 2015-01-06)
A main circuit of a three-level active neutral point clamped voltage source converter having a pair of additional main switches provides two paths between an output node and a neutral point in which one of the paths involves ...
Two-stage single phase bi-directional PWM power converter with DC link capacitor reduction
(United States Patent and Trademark Office, 2015-06-30)
DC link capacitance in a bi-directional AC/DC power converter using a full-bridge or H-bridge switching circuit can be greatly reduced and the power density of the power converter correspondingly increased by inclusion of ...