Research on adaptive segmented control strategy used in direct-drive wave power generation systems

Zhang, Xiaoyu; Huang, Lei; Wei, Lai; Zhao, Yang; Liu, Haitao; Li, Yang

doi:10.1016/j.egyr.2022.06.020

Cited by 4 publications

(2 citation statements)

References 10 publications

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“…However, the above ESSs all have a few drawbacks. When using only electrical energy storage in the DDWPGS, under certain specific conditions, there will be a long-term build-up of energy in the battery, occupying the capacity of the battery, and affecting the state of the energy storage devices, leading to wave abandonment [8]. Mechanical energy storage has the problems of high costs and large maintenance [9].…”

Section: Introductionmentioning

confidence: 99%

Study on the Dynamic Optimal Control Strategy of an Electric-Hydrogen Hybrid Energy Storage System for a Direct Drive Wave Power Generation System

Chang,

Huang,

Zhang

et al. 2023

JMSE

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A direct drive wave power generation system (DDWPGS) has the advantages of a simple structure and easy deployment, and is the first choice to provide electricity for islands and operation platforms in the deep sea. However, due to the off-grid, the source and load cannot be matched, so accommodation is an important issue. Hydrogen storage is the optimal choice for offshore wave energy accommodation. Therefore, aiming at the source-load mismatch problem of the DDWPGS, an electric-hydrogen hybrid energy storage system (HESS) for the DDWPGS is designed in this paper. Based on the characteristics of the devices in the electric-hydrogen HESS, a new dynamic power allocation strategy and its control strategy are proposed. Firstly, empirical mode decomposition (EMD) is utilized to allocate the power fluctuations that need to be stabilized. Secondly, with the state of charge (SOC) of the battery and the operating characteristics of the alkaline electrolyzer being considered, the power assignments of the battery and the electrolyzer are determined using the rule-based method. In addition, model predictive control (MPC) with good tracking performance is used to adjust the output power of the battery and electrolyzer. Finally, the supercapacitor (SC) is controlled to maintain the DC bus voltage while also balancing the system’s power. A simulation was established to verify the feasibility of the designed system. The results show that the electric-hydrogen HESS can stabilize the power fluctuations dynamically when the DDWPGS captures instantaneous power. Moreover, its control strategy can not only reduce the start-stop times of the alkaline electrolyzer but also help the energy storage devices to maintain a good state and extend the service life.

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Section: Introductionmentioning

confidence: 99%

Study on the Dynamic Optimal Control Strategy of an Electric-Hydrogen Hybrid Energy Storage System for a Direct Drive Wave Power Generation System

Chang,

Huang,

Zhang

et al. 2023

JMSE

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“…A HESS usually consists of energy-type and power-type components that smooth out low-and high-frequency power fluctuations, respectively. So far, a variety of HESS combinations have been developed, such as supercapacitors and batteries [12][13][14]; supercapacitors and undersea energy storage [15]; and superconducting magnetic energy storage and batteries [16]. Due to the abundance of offshore renewable energy, multi-energy complementary solutions such as wind-wave complementary configurations [17,18] have also been proposed to mitigate power fluctuations.…”

Section: Introductionmentioning

confidence: 99%

A Novel Multiport Hybrid Wave Energy System for Grid-Connected and Off-Grid Applications

Yu¹,

et al. 2023

Sustainability

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Direct drive wave energy converters (DDWECs) have gradually become the mainstream of wave energy converters (WECs). In order to make better use of wave energy, energy storage devices and other renewable energy sources are often used to suppress power fluctuation in DDWECs. However, the addition of other energy sources will increase the complexity of the converter system and the number of power switches. Considering the flexibility of nine-switch converters (NSCs), this paper proposes a novel nine-switch grid-connected/off-grid multiport hybrid wave energy system (HWES). First, the system structure and modulation principle are described. Then, a model for a generator, a grid and energy storage are built, including a control strategy of each part. Finally, a simulation for the grid-connected/off-grid application and an experiment on the off-grid HWES are carried out. The results show that the multiport wave energy system can achieve the objective of stable and reliable power transmission by reducing power devices.

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Research on adaptive segmented control strategy used in direct-drive wave power generation systems

Cited by 4 publications

References 10 publications

Study on the Dynamic Optimal Control Strategy of an Electric-Hydrogen Hybrid Energy Storage System for a Direct Drive Wave Power Generation System

Study on the Dynamic Optimal Control Strategy of an Electric-Hydrogen Hybrid Energy Storage System for a Direct Drive Wave Power Generation System

A Novel Multiport Hybrid Wave Energy System for Grid-Connected and Off-Grid Applications

Minimizing detent force of permanent magnet linear synchronous machines by designing mover using mesh-level stochastic shaping

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