基于机网变流器协同的波浪发电系统控制策略

Control Strategy of Wave Power System Based on Machine Grid-connected Converter Synergy

为实现波浪发电系统的高效平稳入网,以直驱式波浪发电装置为例,建立其数学模型和并网结构。将装置输出功率分解为平均分量和波动分量,从发电系统主动式控制的角度,进一步提出了阻尼控制和阻尼弹力控制下的最优策略,以使其高效运行。通过直流侧储能配置及机侧和网侧变流器的协同控制,实现电能的平稳入网。仿真结果表明,阻尼弹力控制较于阻尼控制,发电效率更高同时波动更大,直流侧储能及机网侧协同控制可有效平抑功率波动,为波浪发电系统的入网控制设计提供参考。

In order to realize the efficient and smooth grid access of the wave power generation system,a direct-drive wave power generation device is taken as the research object to establish its mathematical model and grid-connected struc-ture.The output power of the device is decomposed into average and fluctuating components.The optimal strategies un-der damping control and damping elasticity control are further proposed from the point of view of the active control of the power generation system in order to make it operate efficiently.Through the DC-side energy storage configuration and the cooperative control of machine-side and grid-side converters,the smooth entry of power into the grid is realized.The sim-ulation results show that the damped elasticity control is more efficient than the damped control,while the fluctuation is larger,and the DC-side energy storage and the machine-and grid-side cooperative control can effectively smooth the pow-er fluctuation,which can provide a reference for the design of the grid control of the wave power system.