Droop assignment algorithm for the inertial control of a DFIG-based wind power plant for supporting the grid frequency

Jinsik Lee, Yong Cheol Kang, Edward Muljadi, Poul Ejnar Sørensen

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

Abstract

In a wind power plant (WPP) consisting of multiple wind generators (WGs), the wind speed of WGs at the downstream side decreases due to the wake effect, and thus their rotor speeds are smaller than those of the upstream WGs because of an MPPT operation. Therefore, WGs in a WPP have different amount of the kinetic energy stored in their rotating masses. This paper proposes a droop assignment algorithm for the inertial control of a doubly-fed induction generator-based WPP to support the grid frequency during the large disturbance. This paper assumes that a WG in the WPP has two supplementary loops for the inertial control, i.e. the frequency deviation loop and the rate of change of frequency (ROCOF) loop. In order to give more contribution on supporting the frequency stability by temporarily releasing more kinetic energy, the proposed algorithm assigns the droop of each WG depending on the rotor speed, while the same gains of the ROCOF loop are set for all WGs. In addition, the wake wind speed arriving at the WG is calculated by considering the wind direction and cumulative impacts of multiple shadowing. The performance of the algorithm was investigated under various wind conditions using an EMTP simulator. The results clearly indicate that the algorithm successfully improves the frequency nadir because WGs with higher wind speeds temporarily releases more kinetic energy.
Original languageEnglish
Title of host publication2014 IEEE Symposium Power Electronics and Machines for Wind and Water Applications (PEMWA)
Number of pages5
PublisherIEEE
Publication date2014
ISBN (Print)978-1-4799-5137-6
DOIs
Publication statusPublished - 2014
EventIEEE Symposium on Power Electronics and Machines for Wind and Water Applications 2014 - Milwaukee, Wisconsin, United States
Duration: 24 Jul 201426 Jul 2014

Conference

ConferenceIEEE Symposium on Power Electronics and Machines for Wind and Water Applications 2014
CountryUnited States
CityMilwaukee, Wisconsin
Period24/07/201426/07/2014

Keywords

  • Power, Energy and Industry Applications

Cite this

Lee, J., Kang, Y. C., Muljadi, E., & Sørensen, P. E. (2014). Droop assignment algorithm for the inertial control of a DFIG-based wind power plant for supporting the grid frequency. In 2014 IEEE Symposium Power Electronics and Machines for Wind and Water Applications (PEMWA) IEEE. https://doi.org/10.1109/PEMWA.2014.6912223