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Title: Voltage control for a wind power plant based on the available reactive current of a DFIG and its impacts on the point of interconnection

Wake effects cause wind turbine generators (WTGs) within a wind power plant (WPP) to produce different levels of active power and subsequent reactive power capabilities. Further, the impedance between a WTG and the point of interconnection (POI)-which depends on the distance between them-impacts the WPP's reactive power injection capability at the POI. This paper proposes a voltage control scheme for a WPP based on the available reactive current of the doubly-fed induction generators (DFIGs) and its impacts on the POI to improve the reactive power injection capability of the WPP. In this paper, a design strategy for modifying the gain of DFIG controller is suggested and the comprehensive properties of these control gains are investigated. In the proposed scheme, the WPP controller, which operates in a voltage control mode, sends the command signal to the DFIGs based on the voltage difference at the POI. The DFIG controllers, which operate in a voltage control mode, employ a proportional controller with a limiter. The gain of the proportional controller is adjusted depending on the available reactive current of the DFIG and the series impedance between the DFIG and the POI. The performance of the proposed scheme is validated for various disturbances suchmore » as a reactive load connection and grid fault using an EMTP-RV simulator. Furthermore, simulation results demonstrate that the proposed scheme promptly recovers the POI voltage by injecting more reactive power after a disturbance than the conventional scheme.« less
Authors:
 [1] ;  [1] ;  [2] ;  [1]
  1. Chonbuk National Univ., Jeonju (Korea, Republic of)
  2. National Renewable Energy Lab. (NREL), Golden, CO (United States)
Publication Date:
OSTI Identifier:
1244208
Report Number(s):
NREL/JA--5D00-66198
Journal ID: ISSN 1975-8359
Grant/Contract Number:
AC36-08GO28308
Type:
Accepted Manuscript
Journal Name:
Transactions of The Korean Institute of Electrical Engineers
Additional Journal Information:
Journal Volume: 65; Journal Issue: 1; Journal ID: ISSN 1975-8359
Publisher:
Korean Institute of Electrical Engineers
Research Org:
NREL (National Renewable Energy Laboratory (NREL), Golden, CO (United States))
Sponsoring Org:
National Research Foundation of Korea (NRF)
Country of Publication:
United States
Language:
English
Subject:
17 WIND ENERGY; 24 POWER TRANSMISSION AND DISTRIBUTION doubly-fed induction generator; voltage control; wind power plant; wake effect; available reactive current; point of interconnection