A Modified SOGI-PLL with Adjustable Refiltering for Improved Stability and Reduced Response Time

The controls of most power electronic inverters connected to an electrical power system (EPS) rely on the precise determination of the voltage magnitude, frequency, and phase angle at the point of common coupling. One of the most widely used approaches for measuring these quantities is the phase-locked loop (PLL); however, the precision of this...

Method to Determine the Closed-Loop Precision of Resonant Sensors from Open-Loop Measurements

Resonant sensors determine a sensed parameter by measuring the resonance frequency of a resonator. For fast continuous sensing, it is desirable to operate resonant sensors in a closed-loop configuration, where a feedback loop ensures that the resonator is always actuated near its resonance frequency, so that the precision is maximized even in...

Effect of PLL Structure on Equivalent Output Impedance of Grid-Side Inverters in Offshore Wind Turbines: MSc Thesis Report

Offshore wind power plants are subject to adverse electrical conditions that are more severe than onshore cases, due to the long cable connection to the shore. Among these conditions are amplified voltage distortion at (inter)harmonic frequencies, as well as stability issues. An important aspect of wind turbine generator control is the phase...

A 60 GHz Frequency Generator Based on a 20 GHz Oscillator and an Implicit Multiplier

This paper proposes a mm-wave frequency generation technique that improves its phase noise (PN) performance and power efficiency. The main idea is that a fundamental 20 GHz signal and its sufficiently strong third harmonic at 60 GHz are generated simultaneously in a single oscillator. The desired 60 GHz local oscillator (LO) signal is delivered...