POWER OPTIMIZATION OF DIRECT-DRIVE WAVE POWER SYSTEM BASED ON VARIATIONAL METHOD FOR LOSS REDUCTION
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摘要: 为提高不规则激励力下直驱式波浪发电系统的输出功率，改善波能捕获能力并减少系统主要损耗，结合电机与水动力方程，建立直驱式波浪发电系统数学模型，基于变分法构造能量泛函，求解泛函极值后得出最优控制律；设计扩展卡尔曼滤波器（EKF）观测系统不易获取的相关状态变量，离线调整泛函惩罚项系数，在不增加整体计算量的情况下获得理想参考电流，并应用磁场定向控制策略进行跟踪，同时兼顾电磁力约束与功率捕获关系。仿真结果表明，所提方案响应速度快、状态观测精度高，可有效提升功率捕获能力、减少系统主要损耗、提高输出功率。Abstract: Aimed at improve the output power of the direct-drive wave power system under irregular excitation force,improve the capturing ability of wave energy and reduce the main loss of the system,combining the motor and hydrodynamic equations to build the mathematical model of the direct-drive wave power system. The energy functional was constructed based on the Variational method,and the optimal control law was obtained after solving the extreme value of the functional. Designing the Extended Kalman filter observer to observe the dependent state variables which are difficultly obtained by the system,and the coefficient of the penalty term of the functional is adjusted off-line to obtain the ideal reference current without increasing the overall computational burden. The Field Oriented control strategy is applied to track the ideal reference current,and the relationship between electrostatic force constraint and power capture is considered. The simulation results show that the proposed strategy has fast response and high observation accuracy,which can validly add the power capture capability,decrease the main loss of the system and add the output power.
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Keywords:
- wave power /
- losses /
- wave energy conversion /
- the Variational method /
- power harvesting
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