【摘要】 为解决LCL型并网逆变器普遍存在的谐振尖峰问题,此处提出一种新型的逆变侧单电流双反馈闭环控制策略,该策略在传统逆变侧单电流反馈控制的基础上,引入有源阻尼反馈环以抑制谐振尖峰,而无需额外增加电容电流传感器;同时为确保系统稳定性,将采样延时函数等效为逆变侧电感串联的虚拟阻抗,通过等效电路分析获得最优的有源阻尼反馈系数。该控制策略能经济而有效地实现对并网电流的间接控制,最后通过搭建一台2 kW的样机证实了控制策略的可行性,可以为LCL型并网逆变器的性能提升提供一种经济且有效的解决方案。更多还原

【Abstract】 A novel inverse-side single current dual-feedback closed-loop control strategy is proposed to address the prevalent issue of resonance peaks in LCL-type grid-connected inverter.This strategy introduces an active damping feedback loop to suppress resonance peaks without the need for additional capacitance current sensors,building upon the traditional inverse-side single current feedback control framework.To ensure system stability,the sampling delay function is equivalently modeled as a virtual impedance in series with the inverse-side inductance,and optimal coefficients for the active damping feedback are obtained through detailed equivalent circuit analysis.This control strategy economically and effectively achieves indirect control of grid-connected currents.Finally,The feasibility of the control strategy is validated through the construction of a 2 kW prototyrpe.This research provides an economic and effective solution for improving the performance of LCL-type grid-connected inverters.更多还原