A Review of Power Electronics for Nearshore Wave Energy Converter Applications

Abstract

In compliance with the green energy policy, mitigation from high fossil fuel dependency is becoming a new objective for most countries, including Malaysia. Wave energy is among extensively explored renewable energy relatively clean, sustainable, and inexhaustible resources. To this day, neither definite wave energy technology nor widely available commercial wave farm supplying the grid has existed. Therefore, wave energy harvesting is the most compelling solution, especially in regions where the possibility of grid connection is low in the nearest future. Like other renewable energy, the voltage amplitude and frequency generated from waves are unstable and may vary continuously. This uncertainty has created energy transfer challenges since the grid requires a stable and uninterrupted energy supply. Therefore, power electronics devices are employed to modulate the controller circuits' pulse width. Further understanding of the relationship between wave energy conversion technology and its power conversion, particularly for nearshore applications, is summarized. This work also discussed selected wave energy conversion research and power conversion system implemented and studied in Malaysia. Finally, this review can provide extensive overview and broad understanding into power conversion system for Wave Energy Conversion, especially for nearshore applications.

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

“…Based on the results of the EMD, the Hilbert transformation is carried out for each IMF. The expression of the Hilbert spectrum transformation is shown in Equation (1). In Figure 2, the intrinsic mode functions (IMF) must satisfy the following requirements: (1) In all time ranges, the number of local extreme points and zero crossing points must be equal or at most one different.…”

“…Based on the results of the EMD, the Hilbert transformation is carried out for each IMF. The expression of the Hilbert spectrum transformation is shown in Equation (1).…”

“…Wave energy has been identified as one of the most promising marine energy sources [1]. The direct drive wave power generation system (DDWPGS) has become one of the most feasible methods in the utilization of wave energy owing to its simplified system architecture, higher energy conversion efficiency, and lower maintenance costs [2].…”

Research on hydrodynamic performance calculation of buoy-chain-sprocket wave energy collection device

“…Wave energy is a clean and renewable energy in the ocean, with the advantages of high energy flow density, large reserves, and wide distribution [1,2], and its exploitation and utilization technology has been paid attention by coastal countries around the world increasingly [3,4]. Among various wave energy utilization technologies, oscillating buoy wave energy collection technology has become a research hotspot in the field of wave energy utilization due to its advantages of simple device structure, good reliability, low operation and maintenance cost, and high collection efficiency.…”

Control Strategy for Array Buoy Type Wave Energy Converters' Power Conversion

“…Due to its enormous energy storage capacity and high energy density, wave energy has increasingly become a marine energy research hotspot as a result of the continuing development of marine energy power generation technology. The oscillating buoytype wave energy converter is regarded as one of the most promising wave energy converters due to its high efficiency, simple structure and great reliability [1][2][3]. However, the single buoy has a limited capacity and captures wave energy in only one direction, whereas the array layout of multiple oscillating buoys enables the device to capture wave energy in multiple directions, which improves the device's conversion efficiency and further reduces the cost of power generation [4,5].…”