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In the development of actual vehicles, manufacturers usually adopt a simplified control strategy to ensure the reliability of the control strategy based on the application scenarios. There are two main working modes for the fuel cell system in fuel cell electric vehicles in China. One is the stepped power type, and the other is the following power type. Therefore, the analysis and comparison of these two typical working modes in the power test of fuel cell electric vehicles helps determine how the fuel cell system works in the actual vehicle and how to choose energy management strategies in different application scenarios. We do the actual tests to explore how the two typical control strategies perform in actual vehicles. These two typical control strategies show different characteristics in the same test. It shows that the energy management strategies should be adopted according to the application scenarios and optimization goals. In the stepped power control strategy, the fluctuation of the fuel cell system and the frequency of starting and stopping are significantly reduced, which is beneficial to the durability of the fuel cell system. Compared with the stepped control strategy, the fluctuation of the output power of fuel cell electric vehicles with the following power control strategy increased significantly. At the same time, a simplified state of charge (SOC) test method is proposed. Due to the particularity of the stepped power control strategy, the change of capacity can be used to replace the change of SOC. For the following power control strategy, the change of electric energy can be used instead of SOC changes. [ABSTRACT FROM AUTHOR]

As the aquaculture industry moves further offshore, there is an increasing prospect of co-locating wave energy converters (WECs) with offshore aquaculture. In China, the multi-use of wave energy and offshore aquaculture has already been implemented and demonstrated commercially. A thorough analysis of the power performance and dynamic and structural responses on the Penghu platform is performed in this paper to improve the understanding of the co-locating potential. The analysis is based on the potential flow theory, multi-body constrained dynamics equations, and quasi-static finite element analysis (FEA) method. It is found that powering offshore aquaculture operations is possible using wave energy paired with solar energy. In addition, the inclusion of WECs can, to some extent, reduce the platform motion, making visits to the aquaculture site more feasible. The inner pool wave elevation is slightly reduced compared to the free surface elevation outside Penghu, which is conducive to aquaculture operations. It is also shown that the structural design of the Penghu platform is very safe. Still, the hinge points must be seriously considered because of the possibility of fatigue fracture. Overall, co-locating WECs and offshore aquaculture is demonstrated as a feasible solution to the power supply problems of offshore aquaculture. • Constrained dynamics of Penghu are modeled. • The effect of the WECs on the Penghu platform is analyzed. • Power performance, dynamic, and structural response are analyzed. • The feasibility of multi-functional integration is assessed. [ABSTRACT FROM AUTHOR]

The field testing and assessment technology for evaluating the power performance and power quality performance of an ocean energy converter plays a crucial role in enhancing the power generation capabilities of the tested converter. Moreover, it facilitates the advancement and growth of the ocean energy converter industry. On the basis of analyzing the current research and development status and test requirements of tidal energy converters and wave energy converters around the world, a field testing and assessment method for power performance and power quality performance of ocean energy converters was explored, measurement requirements for tidal parameters, wave parameters and electric parameters were proposed, and field testing systems for power performance and power quality performance of ocean energy converters were investigated and constructed. The field testing systems and assessment methods investigated in the present study were used to conduct field testing work on a tidal energy converter and a wave energy converter, and the test data was processed and analyzed to obtain the power characteristics performance and power quality characteristics performance of the tested ocean energy converters. The present study not only provides a field testing and assessment technology for ocean energy converters, but also a reference for future field testing and assessment work of ocean energy converters. • Field testing and assessment work has been carried out in China. • Field testing and assessment technology has been introduced in this paper. • Field testing and assessment system has been constructed and used in the field testing work of ocean energy converters. • Field testing and assessment technology can promote the industrial development of ocean energy converters. [ABSTRACT FROM AUTHOR]

Integrating wave energy converters (WECs) on an offshore wind platform provides an economic and robust solution for co-located wind and wave power exploitation. The power performance of the hybrid system depends on the hydrodynamic interactions between the platform and WECs, but most of these effects remain unclear. In this study, through a hybrid system consisting of a semi-submersible platform and heaving point absorber WECs, this matter is addressed based on the higher-order boundary element method and multi-body constrained dynamics. Results show that a new prominent power peak appears while the platform and WECs are in a so-called synchronized mode regardless of the layout of the WECs, wherein the power of a single WEC can be increased by up to 41.4% and the total power by up to 26.7% and the heave motion of the platform increases. Out of the vicinity of the synchronized mode frequency, the WECs have a small impact on the surge motion and pitch motion of the platform, whereas reducing its resonant heave motion at the natural frequency. This work reveals useful insights into the dynamic and power performance of a wind-wave hybrid system, providing detailed configurations and potential guidance for the practical design and application. • Constrained dynamics of a platform and multiple wave energy converters are modeled. • Influences of platform motion on generator damping and power output are analyzed. • Mutual hydrodynamic and dynamic influences in the hybrid system are analyzed. • A new prominent power peak and the corresponding mechanism are revealed. • Power performance is evaluated based on measured wave data in China seas. [ABSTRACT FROM AUTHOR]