Abstract
Application of a Simplified PLL Algorithm for Unbalanced Three Phase Systems by Using Low Cost Microcontrollers
Highlights
One of the important aspects of designing grid connected power electronics systems such as active power filters, distributed power generation systems, flexible AC transmission systems, High Voltage DC transmission systems, distributed energy sources, is the synchronization of the inverter output with the grid itself
A simplified Phased Locked Loop (PLL) algorithm has been used with fixed point arithmetic for detecting phase and magnitude of an unbalanced three phase system
Hardware and software adopted PLL methods for grid matching have already been implemented in many applications
Summary
One of the important aspects of designing grid connected power electronics systems such as active power filters, distributed power generation systems, flexible AC transmission systems, High Voltage DC transmission systems, distributed energy sources, is the synchronization of the inverter output with the grid itself. Hardware and software adopted PLL methods for grid matching have already been implemented in many applications. Solutions for synchronization with poor grid conditions have been vastly investigated and closed loop methods, such as double synchronous reference frame PLL, multiple reference frame PLL, synchronous reference frame PLL with positive sequence filter/detector, synchronous reference frame PLL with sinusoidal signal integrator etc. In [14,15,16] authors have proposed open loop methods such as weighted least square estimation, low pass filtering transformation angle detector, normalized positive sequence synchronous frame etc. Multiple reference frame PLL method utilizing easy to implement low pass filtering with a very low cost 16 bit microcontroller has been used. A low power low cost grid connected inverter even under unbalanced grid conditions could be designed without the need for high computational resource requirements provided by digital signal processors
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