Presentation Details
| Effect of PV Inverter Aggregation on Sandia Frequency Shift Anti-Islanding in Systems with Induction Motor Loads Jorge A.Leon-Quiroga, Rachid Darbali-Zamora, Michael Ropp. Sandia National Laboratories, Albuquerque, NM, USA |
Abstract
The main objective of this paper is to investigate how photovoltaic (PV) inverter aggregation affects the Sandia Frequency Shift (SFS) anti-islanding method in systems with induction motor loads. A MATLAB/Simulink model is developed for a 6 MW PV plant connected to an induction motor load through a transmission and distribution network, which is operating at near active and reactive power balance at the point of common coupling, creating challenging non-detection conditions. Two PV configurations are studied: a single 6 MW aggregated inverter with one phase-locked loop (PLL) and SFS loop, and ten 600 kW disaggregated inverters, each with independent PLL and SFS control. Building on previous work focused on aggregated and disaggregated motor loads, this study extends the analysis to the generation side. The numerical assessment is done for multiple motor load levels and SFS gains. Results show that motor aggregation has a stronger influence on islanding behavior than PV aggregation, with aggregated motor loads producing the longest run-on times, particularly around 20\% of maximum motor load. The simulations also show a partial frequency recovery for some cases that cause an increase in run-on times. The results presented in this paper demonstrate that the level of aggregation on both the load and generation sides strongly affects system dynamics. Moreover, the SFS gain must be carefully tuned, particularly in systems operating near power balance conditions, to ensure reliable and accurate islanding detection.
No part of this publication may be reproduced, distributed, or transmitted in any form or by any means, including photocopying, recording, or other electronic or mechanical methods, without the prior written permission of the author.
No part of this publication may be reproduced, distributed, or transmitted in any form or by any means, including photocopying, recording, or other electronic or mechanical methods, without the prior written permission of the author.