自适应惯量及阻尼VSG的船舶光伏逆变器控制

Adaptive Inertia and Damping VSG Ship Photovoltaic Inverter Control

绿色船舶是未来船舶发展的趋势,随着光伏等新能源引入船舶电网,船舶电网惯性及一次调频能力不足。针对上述问题,在船舶光伏逆变器中引入虚拟同步发电机技术,建立小信号模型,分析转动惯量与阻尼系数对系统动态性能的影响,并提出一种转动惯量和阻尼系数自适应的VSG控制策略,根据虚拟转子角频率的变化率实时调节转动惯量与阻尼系数,并在VSG有功调频基础上引入辅助调频功率,以抑制功率与频率的超调量,改善VSG的动态特性。最后在MATLAB/Simulink中搭建船舶光伏仿真模型,将传统VSG与所提控制策略进行对比分析,结果表明提出的控制策略可以有效抑制功率与频率震荡,增强了船舶光伏发电系统安全稳定运行能力。

The Green Ship is the future trend of ship development.With the utilization of photovoltaic power system and other new power in ship power grid,the inertia and primary frequency adjustment capability of ship power grid are insufficient.To this issue,this paper introduces virtual synchronous generator technology in shipping photovoltaic inverter,setting up a small-signal modele to analyze the effection of moment of inertia and damping factor on the dynamic performance of system and to propse a VSG control strategy which moment of inertia and damping factor can adapt.The auxiliary power was added on the basic VSG control structure.Meanwhile,it can adjust the moment of inertia and damping factor in real time according to the change rate of virtual rotor angular frequency to suppress the maximum overshoot of power and frequency fluctuation and improve the dynamic characteristics of VSG.Finally,a ship photovoltaic simulation model was built in MATLAB/Simulink,and a comparative analysis was conducted between the traditional VSG and adaptive control strategy proposed in this paper.It is showed that the control strategy can effectively suppress the power and frequency oscillation,and improve the safe and stable operation of the ship photovoltaic power generation system.