Decoupling control of a dual‐stator linear and rotary permanent magnet generator for offshore joint wind and wave energy conversion system

Abstract

Wind and wave energy are the main forms of offshore energy. In this study, a new joint wind and wave energy (JWWE) power conversion system, which simultaneously features wind power generation and wave power generation, is investigated. In the JWWE power generation system, a dual-stator linear and rotary permanent magnet generator (DSLRPMG) is employed to directly convert the wind and wave energy. The topology and operating principles of the power generation system are analysed, and the rectifier topology with two three-phase bridge converter is introduced for the JWWE power generation system. On the basis of the vector control method, the mathematical model of the DSLRPMG is deduced. The virtual flux direct power control method without any AC voltage sensors is applied for the power generation system. A new decoupling control method including flux decoupling and power decoupling is proposed and analysed. Meanwhile, an experimental setup is constructed, and the experiments are done. Both the simulation and experimental results show the validity and correctness of the control strategy.

A Review of Power Co-Generation Technologies from Hybrid Offshore Wind and Wave Energy

“…A novel joint wind-wave energy (JWWE) power conversion system is proposed in [46], where a dual-stator linear and rotary permanent magnet generator (DSLRPMG) is deployed to convert the wave and wind energy, respectively. The joint offshore wind and wave energy power conversion is directly employed to convert mechanical energy to electrical energy.…”

“…The flux and power decoupling method are proposed, as shown in Figure 4, where the linear and rotary motions of the DSLRPMG magnetic field presents strong coupling effects. Since the back electromotive force and flux linkage are both sinusoidal, by ignoring the magnetic saturation, hysteresis loss and influence of the temperature, the linear motion v 1 and rotary motion ω r are expressed by the equations below [46].…”

A Review of Power Electronics for Nearshore Wave Energy Converter Applications

“…Based on this research, it can be summarized that the most commonly used modulation technique to control the converters is the PWM technique [23], [47], [73], [49], [51], [52], [59], [61], [69], [71], [72] with the specificity of the Space Vector Pulse Width Modulation (SVPWM) in [48], [59], [69], [70], [73]. According to the application, these modulation techniques control the switching operation of the IGBT/MOSFETs in the converter, which is responsible for generating and regulating the AC sinusoidal voltage output at the desired output frequency.…”

“…[55]- [62] [53], [77], [78] AC/DC [68] [65], [66], [69], [70], [79] -DC/DC [67], [68] [54], [59] hydraulic power take-off system (PTO) simulation using the Simscape library in Matlab/Simulink. Both simulation and experimental results of a hydraulic system of the WEC are proposed in [106].…”

Sectional Modular Technology for Reducing Detent Force of Linear Unit in Linear-rotary Flux-switching Permanent-magnet Generator for Wind-wave Combined Energy Conversion

“…Wind energy and wave energy are significant sources of renewable energy and have attracted considerable attention owing to the advantages of high energy density, environmental protection, and wide distribution with large reserves [1,2]. More recently, windwave combined energy conversion (WWCEC) systems employing a linear-rotary generator have emerged and developed rapidly since they can harvest both these energy sources to generate electrical energy simultaneously through a single generator, thus improving the efficiency and economy of such systems [3].…”