Simplified Feedback Linearization Control of Three-Phase Photovoltaic Inverter With an LCL Filter
Simplified Feedback Linearization Control of Three-Phase Photovoltaic Inverter With an LCL Filter
复制标题
带 LCL 滤波器的三相光伏逆变器的简化反馈线性化控制
DOI：
10.1109/tpel.2012.2225076
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发表时间：
2013-06
影响因子：
6.7
通讯作者：
Tan, Peixuan
中科院分区：
文献类型：
--
作者：
Bao, Xianwen;Zhuo, Fang;Tian, Yuan;Tan, Peixuan
传统的光伏并网逆变器在同步坐标系下采用双环控制策略，忽略高阶和耦合项，基于小信号模型设计稳态运行点控制器。然而，在LCL滤波器中，由于dq变换，耦合项复杂，这将影响动态性能。针对采用LCL滤波器的光伏逆变器，提出了一种新的简化反馈线性化(SFL)控制策略，特别是在解耦控制系统、改善动态性能和增强适应性方面具有良好的性能。此外，SFL控制器比传统反馈线性化控制中使用的高阶跟踪控制器更简单。给出了SFL控制策略的详细简化过程和精确的传递函数，并与经典的双环控制策略进行了性能比较，说明了所提控制算法的特点。最后，以150 kW带LCL滤波器的光伏逆变器的实验室样机为例，验证了所提策略的可行性和有效性。所提出的SFL控制策略也可应用于高阶系统或其他功率变流器。
The conventional grid-connected photovoltaic (PV) inverter is controlled by a dual-loop control strategy in synchronous reference frame, and the controllers are designed for steady-state operating point based on the small signal model by neglecting the high-order and coupling terms. However, in an LCL filter, the coupling terms are complicated due to the dq transformation which will affect the dynamic performance. In this paper, an innovative simplified feedback linearization (SFL) control strategy is proposed for the PV inverter with the LCL filter, which offers satisfactory performance, particularly, in decoupling the control system, improving the dynamic performance, and enhancing the adaptability. Furthermore, the SFL controllers are simpler than the high-order tracking controllers used in conventional feedback linearization control. The detailed simplification process and accurate transfer functions for SFL control strategy have been presented, and the performance comparisons between the proposed SFL control strategy and the classical dual-loop method are carried out to show the characteristics of the proposed control algorithm. Finally, a laboratory prototype of a 150-kW PV inverter with the LCL filter has been implemented to test the feasibility and effectiveness of the proposed strategy. The proposed SFL control strategy can also be applied to a higher order system or other power converters.
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