Hierarchical Control Scheme for Improving Transient Voltage Recovery of a DFIG-Based WPP

Eduard Muljadi, Jinho Kim, Yong Kang

Research output: Contribution to conferencePaper

6 Scopus Citations

Abstract

Modern grid codes require that wind power plants (WPPs) inject reactive power according to the voltage dip at a point of interconnection (POI). This requirement helps to support a POI voltage during a fault. However, if a fault is cleared, the POI and wind turbine generator (WTG) voltages are likely to exceed acceptable levels unless the WPP reduces the injected reactive power quickly. This might deteriorate the stability of a grid by allowing the disconnection of WTGs to avoid any damage. This paper proposes a hierarchical control scheme of a doubly-fed induction generator (DFIG)-based WPP. The proposed scheme aims to improve the reactive power injecting capability during the fault and suppress the overvoltage after the fault clearance. To achieve the former, an adaptive reactive power-to-voltage scheme is implemented in each DFIG controller so that a DFIG with a larger reactive power capability will inject more reactive power. To achieve the latter, a washout filter is used to capture a high frequency component contained in the WPP voltage, which is used to remove the accumulated values in the proportional-integral controllers. Test results indicate that the scheme successfully supports the grid voltage during the fault, and recovers WPP voltages without exceeding the limit after the fault clearance.
Original languageAmerican English
Pages890-893
Number of pages4
DOIs
StatePublished - 2015
Event2015 9th International Conference on Power Electronics and ECCE Asia (ICPE-ECCE Asia) - Seoul, Korea
Duration: 1 Jun 20155 Jun 2015

Conference

Conference2015 9th International Conference on Power Electronics and ECCE Asia (ICPE-ECCE Asia)
CitySeoul, Korea
Period1/06/155/06/15

NREL Publication Number

  • NREL/CP-5D00-66317

Keywords

  • DFIG
  • overvoltage
  • Q-V characteristic
  • voltage control of a WPP

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