Direct drive wave energy converter control in irregular waves

B. Li, D. E. MaCpherson, J. K.H. Shek

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

12 Citations (Scopus)


This paper describes causal sub-optimal control of a direct drive linear generator to extract the maximum power from real sea conditions without wave prediction. The reaction force required to control the buoy to move in phase with the ocean waves is provided by the linear generator. After determining the power take-off force based on the model of a machine, the required currents from the generator can be obtained. These currents have varying amplitudes and frequencies thus presenting a challenge to traditional Pulse Width Modulation control. In this paper, a continuously varying average voltage method is presented where the average voltage for each switching cycle is determined by pre-calculated duty ratio to meet the required voltages before coming into the power converter. Using Matlab/Simulink, simulated results of the power converter current control are presented.

Original languageEnglish
Title of host publicationIET Conference on Renewable Power Generation, RPG 2011
Number of pages1
Edition579 CP
Publication statusPublished - 2011
Externally publishedYes
EventIET Conference on Renewable Power Generation, RPG 2011 - Edinburgh, United Kingdom
Duration: 9 May 20118 Sept 2011

Publication series

NameIET Conference Publications
Number579 CP


ConferenceIET Conference on Renewable Power Generation, RPG 2011
Country/TerritoryUnited Kingdom


  • Direct drive
  • Irregular waves
  • Power converter
  • Reactive control

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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