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Title: Damping of Inter-Area Oscillations via Modulation of Aggregated Loads

Abstract

Low frequency electromechanical oscillations can pose a threat to the stability of power systems if not properly addressed. This paper proposes a novel methodology to damp these inter-area oscillations using loads, the demand side of the system. In the proposed methodology, loads are assigned to an aggregated cluster whose demand is modulated for oscillation damping. The load cluster control action is obtained from an optimal output feedback control (OOFC) strategy. The paper presents an extension to the regular OOFC formulation by imposing a constraint on the sum of the rows in the optimal gain matrix. This constraint is useful when the feedback signals are generator speeds. In this case, the sum of the rows of the optimal gain matrix is the droop gain of each load actuator. Time-domain simulations of a large-scale power system are used to demonstrate the efficacy of the proposed control algorithm. Two different cases are considered: a power imbalance and a line fault. The simulation results show that the proposed controllers successfully damp inter-area oscillations under different operating conditions and with different clustering for the events considered. In addition, the simulations illustrate the benefit of the proposed extension to the OOFC that enable load to providemore » a combination of droop control and small signal stability augmentation.« less

Authors:
 [1];  [1];  [2]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States). Electric Power System Research Group
  2. Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Optimization and Control
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1574490
Report Number(s):
SAND2019-13554J
Journal ID: ISSN 0885-8950; 681159
Grant/Contract Number:  
AC04-94AL85000; NA0003525; AC05-76RL01830
Resource Type:
Accepted Manuscript
Journal Name:
IEEE Transactions on Power Systems
Additional Journal Information:
Journal Name: IEEE Transactions on Power Systems; Journal ID: ISSN 0885-8950
Publisher:
IEEE
Country of Publication:
United States
Language:
English
Subject:
small signal stability; damping control; load modulation; load aggregation; system identification

Citation Formats

Wilches-Bernal, Felipe, Byrne, Raymond H., and Lian, Jianming. Damping of Inter-Area Oscillations via Modulation of Aggregated Loads. United States: N. p., 2019. Web. doi:10.1109/TPWRS.2019.2948116.
Wilches-Bernal, Felipe, Byrne, Raymond H., & Lian, Jianming. Damping of Inter-Area Oscillations via Modulation of Aggregated Loads. United States. doi:10.1109/TPWRS.2019.2948116.
Wilches-Bernal, Felipe, Byrne, Raymond H., and Lian, Jianming. Fri . "Damping of Inter-Area Oscillations via Modulation of Aggregated Loads". United States. doi:10.1109/TPWRS.2019.2948116. https://www.osti.gov/servlets/purl/1574490.
@article{osti_1574490,
title = {Damping of Inter-Area Oscillations via Modulation of Aggregated Loads},
author = {Wilches-Bernal, Felipe and Byrne, Raymond H. and Lian, Jianming},
abstractNote = {Low frequency electromechanical oscillations can pose a threat to the stability of power systems if not properly addressed. This paper proposes a novel methodology to damp these inter-area oscillations using loads, the demand side of the system. In the proposed methodology, loads are assigned to an aggregated cluster whose demand is modulated for oscillation damping. The load cluster control action is obtained from an optimal output feedback control (OOFC) strategy. The paper presents an extension to the regular OOFC formulation by imposing a constraint on the sum of the rows in the optimal gain matrix. This constraint is useful when the feedback signals are generator speeds. In this case, the sum of the rows of the optimal gain matrix is the droop gain of each load actuator. Time-domain simulations of a large-scale power system are used to demonstrate the efficacy of the proposed control algorithm. Two different cases are considered: a power imbalance and a line fault. The simulation results show that the proposed controllers successfully damp inter-area oscillations under different operating conditions and with different clustering for the events considered. In addition, the simulations illustrate the benefit of the proposed extension to the OOFC that enable load to provide a combination of droop control and small signal stability augmentation.},
doi = {10.1109/TPWRS.2019.2948116},
journal = {IEEE Transactions on Power Systems},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {10}
}

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