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Title: Real-Time Local Volt/VAR Control Under External Disturbances with High PV Penetration

Volt/var control (VVC) of smart PV inverter is becoming one of the most popular solutions to address the voltage challenges associated with high PV penetration. This work focuses on the local droop VVC recommended by the grid integration standards IEEE1547, rule21 and addresses their major challenges i.e. appropriate parameters selection under changing conditions, and the control being vulnerable to instability (or voltage oscillations) and significant steady state error (SSE). This is achieved by proposing a two-layer local real-time adaptive VVC that has two major features i.e. a) it is able to ensure both low SSE and control stability simultaneously without compromising either; and b) it dynamically adapts its parameters to ensure good performance in a wide range of external disturbances such as sudden cloud cover, cloud intermittency, and substation voltage changes. A theoretical analysis and convergence proof of the proposed control is also discussed. The proposed control is implementation friendly as it fits well within the integration standard framework and depends only on the local bus information. Furthermore, the performance is compared with the existing droop VVC methods in several scenarios on a large unbalanced 3-phase feeder with detailed secondary side modeling.
Authors:
 [1] ;  [1] ;  [2] ;  [2]
  1. Iowa State Univ., Ames, IA (United States)
  2. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Publication Date:
Report Number(s):
PNNL-SA-129889
Journal ID: ISSN 1949-3053
Grant/Contract Number:
AC05-76RL01830
Type:
Accepted Manuscript
Journal Name:
IEEE Transactions on Smart Grid
Additional Journal Information:
Journal Name: IEEE Transactions on Smart Grid; Journal ID: ISSN 1949-3053
Publisher:
IEEE
Research Org:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; solar photovoltaic system; smart grid; volt/var control; smart inverter; real-time control; distributed control
OSTI Identifier:
1441211

Singhal, A., Ajjarapu, V., Fuller, Jason C., and Hansen, Jacob. Real-Time Local Volt/VAR Control Under External Disturbances with High PV Penetration. United States: N. p., Web. doi:10.1109/TSG.2018.2840965.
Singhal, A., Ajjarapu, V., Fuller, Jason C., & Hansen, Jacob. Real-Time Local Volt/VAR Control Under External Disturbances with High PV Penetration. United States. doi:10.1109/TSG.2018.2840965.
Singhal, A., Ajjarapu, V., Fuller, Jason C., and Hansen, Jacob. 2018. "Real-Time Local Volt/VAR Control Under External Disturbances with High PV Penetration". United States. doi:10.1109/TSG.2018.2840965.
@article{osti_1441211,
title = {Real-Time Local Volt/VAR Control Under External Disturbances with High PV Penetration},
author = {Singhal, A. and Ajjarapu, V. and Fuller, Jason C. and Hansen, Jacob},
abstractNote = {Volt/var control (VVC) of smart PV inverter is becoming one of the most popular solutions to address the voltage challenges associated with high PV penetration. This work focuses on the local droop VVC recommended by the grid integration standards IEEE1547, rule21 and addresses their major challenges i.e. appropriate parameters selection under changing conditions, and the control being vulnerable to instability (or voltage oscillations) and significant steady state error (SSE). This is achieved by proposing a two-layer local real-time adaptive VVC that has two major features i.e. a) it is able to ensure both low SSE and control stability simultaneously without compromising either; and b) it dynamically adapts its parameters to ensure good performance in a wide range of external disturbances such as sudden cloud cover, cloud intermittency, and substation voltage changes. A theoretical analysis and convergence proof of the proposed control is also discussed. The proposed control is implementation friendly as it fits well within the integration standard framework and depends only on the local bus information. Furthermore, the performance is compared with the existing droop VVC methods in several scenarios on a large unbalanced 3-phase feeder with detailed secondary side modeling.},
doi = {10.1109/TSG.2018.2840965},
journal = {IEEE Transactions on Smart Grid},
number = ,
volume = ,
place = {United States},
year = {2018},
month = {5}
}