太阳能船舶光伏系统构网型逆变器并网控制策略

Grid-connected control strategy of GFM inverter in solar-powered ship photovoltaic system

[目的]旨在解决现有太阳能船舶光伏发电系统采用跟网型控制策略并网,而导致的船舶电力系统整体稳定性下降问题。[方法]结合船舶电力系统特点和运行特性,以跟网型恒功率控制和构网型下垂控制为研究基础,另外选取构网型虚拟同步发电机控制和构网型虚拟振荡器控制,共4种逆变器控制方法,分别构建太阳能船舶电力系统光伏并网控制策略。最后通过Matlab/Simulink建立太阳能船舶电力系统仿真模型,验证构网型控制理念和思路的有效性。[结果]研究结果表明,与跟网型控制相比,在负荷投切工况下,采用构网型控制策略可使频率波动极值平均减小26.86%、电压调节时间平均减小37.85%。在光伏输出功率切换工况下,频率波动极值平均减小39.95%。[结论]采用构网型控制策略能有效抑制光伏系统并网后所导致的船舶电力系统稳定性下降的问题。能够使光伏系统在完成供能的同时,主动维持船舶电力系统电力参数稳定,显著提高船舶电力系统稳定性。

[Objective]The paper aims to solve the problem of the overall stability of the ship's power system being reduced due to the use of grid-following(GFL)control for grid connection in existing solar ship photovoltaic(PV)power generation systems.[Methods]Based on the characteristics and operational characteristics of marine power systems,four inverter control methods,including GFL PQ control and grid-forming(GFM)droop control,as well as virtual synchronous generator(VSG)control and virtual oscillator control(VOC),were selected to construct photovoltaic grid-connected control strategies for solar-powered marine power systems.Finally,Matlab/Simulink is used to establish a simulation model of a solar ship power system in order to verify the effectiveness of the GFM control concepts and ideas.[Results]Compared to the GFL control strategy,the utilization of GFM under load switching conditions can lead to an average reduction of 26.86%in frequency fluctuation amplitude and 37.85%in voltage regulation time.[Conclusions]The utilization of the GFM control strategy is capable of effectively mitigating the stability deterioration of the ship's power system triggered by the grid-connected photovoltaic system.This approach enables the PV system to proactively uphold the stability of the power parameters of the ship's power system while fulfilling the energy supply,resulting in the substantial enhancement of the power system's stability.