船舶供电变流器柔性并/离网控制及输出电压谐波抑制策略

首先提出根据船舶供电变流器并/离网状态反馈分别进行电流控制、电压控制的模式切换控制方法,实现了离网模式下输出电压快速响应以及并网模式下与电网交互功率的可控转移;其次基于调幅、调频的预同步控制以及电压电流双闭环控制共用比例积分调节器,保证了控制模式切换时积分量的平滑过渡,实现了供电变流器柔性并/离网;然后引入基于多重降阶广义积分器(ROGI)并联的方法实现对输出电压不平衡以及5次和7次谐波的抑制,通过在离散域直接设计ROGI控制参数,避免了数字化过程导致控制器性能偏差;最后搭建了某型船舶直流组网电力推进系统供电变流器的实验平台对所提控制方法的正确性和有效性进行了验证.

Grid-connected/islanded control and output voltage harmonic suppression strategy for onboard power supply converters

Firstly, the current-voltage control mode switching method according to grid-connected/islanded status of onboard power supply converters is proposed, which realizes the fast response of output voltage under grid-islanded condition and the controlled transfer of interactive power with onshore AC grid under grid-connected condition. Secondly, the amplitude & frequency regulation based presynchronization control and the voltage and current double closed-loop control share one proportional-integral regulator, which guarantees the smooth transition of the integral quantity when control mode switching and realizes the seamless transfer of grid-connected/islanded control. Thirdly, the method of multiple ROGIs(Reduced Order Generalized Integrators) in parallel is introduced to suppress the voltage unbalance as well as 5th and 7th harmonics, and the control parameters of ROGI are designed directly in discrete domain to avoid the controller performance deviation caused by digitalization. Finally, the experimental platform for power supply converter of onboard DC-grid electric propulsion system is constructed to verify the correctness and effectiveness of the proposed control method.