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Effect of PLL on Current Distortion of Droop-Controlled Converters in a Control-In-the-Loop Simulation of a Microgrid | IEEE Conference Publication | IEEE Xplore

Effect of PLL on Current Distortion of Droop-Controlled Converters in a Control-In-the-Loop Simulation of a Microgrid

Publisher: IEEE

Abstract:

A grid-following converter in ac microgrids must include grid synchronization algorithms, such as Phase-Lock Loop (PLL) systems, within its control system, so it is able ...View more

Abstract:

A grid-following converter in ac microgrids must include grid synchronization algorithms, such as Phase-Lock Loop (PLL) systems, within its control system, so it is able to properly inject or absorb power. PLL plays an important role to guarantee the stable operation of the converter for distinct grid conditions, and it becomes critical in microgrids with multiple converters, where mutual influence among the control and the interface passive devices of individual converters exists. Moreover, as long as PLLs basically estimate the system phase from voltages on their point of coupling to the grid, the grid synchronization is subjected to errors due to the digital-to-analog conversion and signal processing through conditioning circuits. The paper proposes the discussion on the mutual effects of PLL choice in two grid-following converters in a microgrid and on the impacts of errors introduced by voltage detection of the PLL. Results from real-time simulation through Control-In-the-Loop are presented.
Date of Conference: 07-10 November 2021
Date Added to IEEE Xplore: 24 January 2022
ISBN Information:

ISSN Information:

Publisher: IEEE
Conference Location: João Pessoa, Brazil

I. Introduction

The operation of a micro grid in isolated mode must include power control methods so the load is shared among the power sources [1], [2]. Power converters, or simply converters, operating in a microgrid can form or follow the grid voltage. For the first case, the voltage magnitude and frequency may be constant or a droop-based synchronization algorithm can adjust magnitude and frequency according to the converter power. For the latter, a different synchronization algorithm is required so the converter follows the voltage at its point of coupling. Phase Locked Loop (PLL) schemes are commonly used to estimate frequency and phase from voltage observations and to provide synchronization [3]–[5]. The phase estimation creates the synchronous reference frame (SRF) in which the current control operates.

References

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