This paper presents the analysis of a hydraulic transmission model used in various types of wave energy conversion systems. In this case, a multi-point absorber wave energy converter is used because its structure is s...
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ISBN:
(纸本)9781728156415
This paper presents the analysis of a hydraulic transmission model used in various types of wave energy conversion systems. In this case, a multi-point absorber wave energy converter is used because its structure is simple and efficient. This design offers some advantages such as greater energy harvesting and stabilization of the output power. In this way, the union of the hydraulic system and electric generator in detail is presented. The objective of the proposed approach has been to maintain the speed in the electric generator and reduce the effect of wave energy fluctuation on the output power. At the same time, an mppt (Maximum Power Point Tracking) controlalgorithm is incorporated. Its purpose is to obtain maximum efficiency of the proposed system. In addition, the system uses an HVDC line and high-power DC/DC converters to connect to the power grid. The different modules are connected in parallel on the side of the buoy-farm and in series on the HVDC transmission line to achieve high power and high voltage. The developed model also incorporates a decentralized hybrid energy storage system (dHESS) based on ultracapacitors. In many cases, ESS is necessary for the grid integration of marine energy due to flicker restrictions in the devices, which allows us to attenuate the oscillations of energy injected into the HVDC line. The WEC system and the dHESS model have been simulated in Matlab-Simulink. In this way, different simulations have been developed to verify the basic characteristics of the proposed system. The results of the simulated model and the conclusions obtained are also presented in this document.
With the continuous growth of global energy demand and the increasing severity of environmental issues, photovoltaic (PV) power generation, as a clean and renewable energy source, has attracted widespread attention. H...
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With the continuous growth of global energy demand and the increasing severity of environmental issues, photovoltaic (PV) power generation, as a clean and renewable energy source, has attracted widespread attention. However, the performance of PV systems is easily affected by factors such as irradiance and temperature in complex environments, leading to significant fluctuations in output power and making it difficult to achieve stable and efficient energy conversion. To address this issue, this paper proposes an enhanced maximum power point tracking (mppt) algorithm based on the combination of improved gray wolf optimizer (GWO) and incremental conductance (INC) methods, aiming to improve the adaptability and stability of PV systems in complex environments. By introducing innovative measures such as a candidate point dynamic focusing mechanism, position updates with perturbation factors, a five-level dynamic step-size strategy, direction consistency detection, and momentum suppression, the algorithm improves the search efficiency of the GWO and its adaptability to environmental mutations, avoids the drawbacks of fixed step sizes, and reduces overshoot and oscillations. Simulation verification was carried out on a simulation platform. The simulation results show that under various operating conditions, the algorithm achieves a good adaptive balance between global exploration and local exploitation, with tracking efficiency consistently above 99%, significantly improving the accuracy and efficiency of maximum power point tracking.
Under normal operating conditions, the flow rate of a solar pump fed by a photovoltaic array follows the variations of the irradiance. However, the flow rate of a photovoltaic pumping system coupled to a water filtrat...
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ISBN:
(纸本)9781479975143
Under normal operating conditions, the flow rate of a solar pump fed by a photovoltaic array follows the variations of the irradiance. However, the flow rate of a photovoltaic pumping system coupled to a water filtration unit should be constant under a constant pressure. So, the combination of solar batteries with a photovoltaic array is required. This paper presents a specific structure of the P & O algorithm for controlling a boost converter inserted between the photovoltaic array without batteries and the driving motor of a centrifugal pump. The simulation results in MATLAB/SIMULINK with ode23t solver show that blocking of the duty ratio of the control pulses of the boost converter enables to maintain a constant output voltage, even if the irradiance varies. Thus, for a duty ratio locked between 0.79 and 0.9, the output voltage of 236 V is obtained, for a flow rate of 1.08 l/s under a pressure of 5.8 bars.
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