Research on the Performance Optimization of a Hydraulic PTO System for a“Dolphin 1”Oscillating-Body Wave Energy Converter  

作　　者：LAI Wen-bin LI Jia-long RONG Si-zhang YANG Hong-kun ZHENG Xiong-bo 

机构地区：[1]College of Mathematics Sciences,Harbin Engineering University,Harbin 150001,China

出　　处：《China Ocean Engineering》2025年第1期166-178,共13页中国海洋工程(英文版)

基　　金：financially supported by the National Natural Science Foundation of China(Grant Nos.52071094 and 51979065).

摘　　要：In this work,an oscillating-body wave energy converter(OBWEC)with a hydraulic power take-off(PTO)system named“Dolphin 1”is designed,in which the hydraulic PTO system is equivalent to a transfer station and plays a crucial role in ensuring the stability of the electrical energy output and the efficiency of the overall system.A corresponding mathematical model for the hydraulic PTO system has been established,the factors that influence its performance have been studied,and an algorithm for solving the optimal working pressure has been derived in this paper.Moreover,a PID control method to enable the hydraulic PTO system to automatically achieve optimal performance under different wave conditions has been designed.The results indicate that,compared with single-chamber hydraulic cylinders,double-chamber hydraulic cylinders have a wider application range and greater performance;the accumulator can stabilize the output power of the hydraulic PTO system and slightly increase it;excessively large or small hydraulic motor displacement hinders system performance;and each wave condition corresponds to a unique optimal working pressure for the hydraulic PTO system.In addition,the relationship between the optimal working pressure P_(m)and the pressure P_(h)of the wave force acting on the piston satisfies P_(m)^(2)=∫_(t_(1))^(t_(2))P_(h)^(2)dt/(t_(2)-t_(1)).Furthermore,adjusting the hydraulic motor displacement automatically via a PID controller ensures that the actual working pressure of the hydraulic PTO system consistently reaches or approaches its theoretically optimal value under various wave conditions,which is a very effective control method for enhancing the performance of the hydraulic PTO system.

关 键 词：hydraulic PTO system performance optimization wave energy converter optimal working pressure PID control 

分 类 号：TN9[电子电信—信息与通信工程]