Power Feedforward Method for Passivity-based Gridconnected PV Inverter in Weak Grids

Guihua Liu, Wen-xia Wang, Wei Wang, Kai Zhu
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引用次数: 1

Abstract

For the conventional two-stage grid-connected photovoltaic (PV) inverter, the second stage usually adopts the voltage-current double closed-loop control. When the output power of PV panels changes, it is necessary to change the voltage of DC bus to change the energy output of the second stage. However, limited by the bandwidth of the outer voltage loop in the second stage, the dynamic response speed of the system is not ideal. Scheming for this problem, according to the characteristics of two-stage grid-connected PV inverter, the double closed-loop control containing outer voltage loop and passivity-based inner current loop is adopted and the power feedforward control is added to this structure. That is, add the output power of PV panels in the first stage as a feedforward to the inner current loop in the second stage. Therefore, the reference value of the inner current loop is composed of the output of both the outer voltage loop and the power feedforward loop. Simulation and experimental results show that the proposed method can effectively improve the dynamic response speed of the second stage to the power changes in first stage and shorten the transient response process. Besides, the power feedforward control can reduce the steady-state error and the overshoot of DC-bus voltage while improving the robustness of the system.
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弱电网无源并网光伏逆变器功率前馈方法
对于传统的两级光伏并网逆变器,第二级通常采用电压-电流双闭环控制。当光伏板的输出功率发生变化时,需要改变直流母线的电压来改变第二级的能量输出。然而,受第二级外电压环带宽的限制,系统的动态响应速度并不理想。针对该问题的方案设计,根据两级并网光伏逆变器的特点,采用了包含外电压环和基于无源性的内电流环的双闭环控制,并在此结构中加入了功率前馈控制。即将第一级光伏板的输出功率作为前馈加入到第二级电流内环中。因此,内电流环的参考值由外电压环和功率前馈环的输出组成。仿真和实验结果表明,该方法能有效提高二级系统对一级功率变化的动态响应速度,缩短暂态响应过程。此外,功率前馈控制可以减小稳态误差和直流母线电压超调量,提高系统的鲁棒性。
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