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A method for smoothing grid power fluctuation in hydraulic energy storage type wave energy converter based on active power compensation

Author

Listed:
  • Wang, Kunlin
  • Gao, Dongzhao
  • Wang, Zhe
  • Sheng, Songwei
  • Ye, Yin
  • Huang, Zhenxin
  • Yu, Peng
  • Wu, Zhuli

Abstract

The intermittency of wave energy power generation due to the oscillatory nature of wave resources and frequent switching of operation modes of hydraulic generator sets can result in high power ramp rates, which poses a challenge for grid voltage and frequency regulation in island microgrids. To this end, this paper introduces an active power compensation (APC) device consisting of batteries and an inverter to smooth out power fluctuations in the hydraulic energy storage type wave energy converter (WEC). To reduce energy storage costs, a tailored small-capacity design method is presented. Based on the analysis between accumulator pressure and the power ramp rate, an improved power ramp rate control strategy is proposed. The improved power ramp rate control strategy based on the accumulator pressure can address the energy imbalance in the conventional power ramp rate control strategy. Next, APC devices with four different control strategies are compared in regular and irregular wave conditions. The results show that the APCs with all four control strategies can reduce the power ramp rate of the WEC. The feasibility of the APC device for smoothing WEC power fluctuations is verified by simulations and physical experiments, which facilitates the application of wave energy in island microgrids.

Suggested Citation

  • Wang, Kunlin & Gao, Dongzhao & Wang, Zhe & Sheng, Songwei & Ye, Yin & Huang, Zhenxin & Yu, Peng & Wu, Zhuli, 2026. "A method for smoothing grid power fluctuation in hydraulic energy storage type wave energy converter based on active power compensation," Energy, Elsevier, vol. 342(C).
    • Handle: RePEc:eee:energy:v:342:y:2026:i:c:s0360544225052934
    DOI: 10.1016/j.energy.2025.139651
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    References listed on IDEAS

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